Sep. 2024, 電子情報通信学会, 通信ソサイエティ活動功労賞×2　　　　　　　　　　　　　　　
”2016年9月”,”2017年9月”,”2019年9月”,および”2022年9月”同賞受賞(通算6)
日景 隆

Aug. 2024, IEICE Communications Express, TOP DOWNLOADED LETTER AWARD in June 2024
A Study on Gain and Bandwidth Enhancement of 4×4 Planar Array of X-Shaped Slot Antenna within Millimeter Wave Frequency Band

Nov. 2023, 2023 International Conference on Emerging Technologies for Communications, Outstanding Contribution Award
Takashi Hikage, International society

Nov. 2020, Faculty of Information Science and Technology, Hokkaido University, 令和2年度 若手産学共同研究促進事業 研究院長賞
Takashi Hikage, Japan

Jun. 2020, 電子情報通信学会, 論文賞（第76回）
数値シミュレーションを用いた26 GHz帯屋内伝搬における人体遮蔽特性推定法についての一検討
日景 隆

Sep. 2012, EMC Europe 2012, The Best Paper Award　　　　　　　　　　　　　　　
"Numerical Assessment Methodology for Active Implantable Medical Device EMI due to Magnetic Resonance Wireless Power Transmission Antenna"
HIKAGE Takashi

Dec. 2008, Asia-Pacific Microwave Conference, The APMC PRIZE　　　　　　　　　　　　　　　
"An Experimental Validation of a Detailed Numerical Model for Predicting Implantable Medical Devices EMI due to Low-band RFID Reader/writers"
HIKAGE Takashi

2002, IEEE AP-S Japan Chapter Young Engineer Award　　　　　　　　　　　　　　　
日景 隆, Japan

2001, 電子情報通信学会 学術奨励賞　　　　　　　　　　　　　　　
日景 隆, Japan

Dec. 1999, 電子情報通信学会 アンテナ・伝播研究専門委員会, 1999年度アンテナ・伝播研究会フレッシュマンセッション 優秀賞　　　　　　　　　　　　　　　
送電アンテナ用薄形キャビティ付きスロットアンテナの設計
日景 隆, Japan society

1999, 電子情報通信学会北海道支部 学生員奨励賞　　　　　　　　　　　　　　　
日景 隆, Japan

1998, 電気関係学会北海道支部連合大会 若手講演者表彰　　　　　　　　　　　　　　　
日景 隆, Japan

Association between children's intended screen time use and behavior problems in Japan: the Hokkaido Study on Environmental and Children's Health.
Naomi Tamura, Keiko Yamazaki, Chihiro Miyashita, Atsuko Ikeda, Ammara Ajmal, Satoshi Suyama, Takashi Hikage, Manabu Omiya, Masahiro Mizuta, Reiko Kishi
Environmental health and preventive medicine, 30, 82, Nov. 2025, [Peer-reviewed], [International Magazine]
English, Scientific journal, BACKGROUND: Long screen time hours may be associated with behavioral problems in children. To better understand the relationship between children's behavioral problems and screen time, it the associated risk factors must be subdivided based on the purpose underlying screen use. This study examined the relationship between screen time based on intended usage and behavioral problems in Japan. METHODS: This study included 3,332 children aged between 7-17 years from the Hokkaido Study on Environment and Children's Health. From October 2020 to October 2021, the children and their parents answered questionnaires on the children's screen use duration (never used, <30 min, ≥30 min & <1 hour, ≥1 h & <2 h, ≥2 h) based on seven intended usage categories: watching television/video, video gaming, reading books/comics, sending/receiving e-mail/messages, browsing/posting on social networking services, studying for classes/homework, drawing/editing pictures/photos/videos, along with the Strengths and Difficulties Questionnaire (SDQ). Logistic regression was used to analyze the association between screen time, purpose of children's screen use, and behavioral problems across the 13 SDQ total scores. RESULTS: The mean ± standard deviation age of the participants was 12.4 ± 2.4-years-old, 487 (14.6%) children were determined to have behavioral problems, and the duration of screen time increased with their age. The children's primary purposes for screen use were watching television/video, video gaming, sending/receiving e-mail/messages, and browsing/posting on social networking services. Children who reported playing video games for ≥2 hours on weekdays had higher odds of problematic total difficulties scores than never user (Odds Ratio: 2.10, 95% confidence interval: 1.45-3.06). CONCLUSION: Long video gaming screen time is associated with behavioral issues, hyperactivity/inattention, and prosocial behaviors in children. Conversely, watching television and videos for 30 min-1 h per day, using e-mail or messaging, and using social networking services were significantly association with reduced odds ratio for peer relationship problems as compared to children who never engaged in these activities. Longitudinal follow-up is needed to further examine screen time and problem behaviors.

Roadmap towards Personalized Approaches and Safety Considerations in Non-Ionizing Radiation: From Dosimetry to Therapeutic and Diagnostic Applications.
Ilkka Laakso, Margarethus Marius Paulides, Sachiko Kodera, Seungyoung Ahn, Christopher L Brace, Marta Cavagnaro, Ji Chen, Zhi-De Deng, Valerio De Santis, Yinliang Diao, Lourdes Farrugia, Mauro Feliziani, Serena Fiocchi, Francesco Fioranelli, Takashi Hikage, Sergey Makaroff, Maya Mizuno, Alexander Opitz, Emma Pickwell-MacPherson, Punit Prakash, Dario B Rodrigues, Kensuke Sasaki, Takuya Sakamoto, Zachary Taylor, Hubregt J Visser, Desmond T B Yeo, Akimasa Hirata
ArXiv, 2509.21165, 101, 25 Sep. 2025, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, This roadmap provides a comprehensive and forward-looking perspective on the individualized application and safety of non-ionizing radiation (NIR) dosimetry in diagnostic and therapeutic medicine. Covering a wide range of frequencies, i.e., from low-frequency to terahertz, this document provides an overview of the current state of the art and anticipates future research needs in selected key topics of NIR-based medical applications. It also emphasizes the importance of personalized dosimetry, rigorous safety evaluation, and interdisciplinary collaboration to ensure safe and effective integration of NIR technologies in modern therapy and diagnosis.

Electromagnetic Field Analysis and EMI Evaluation of Radio Altimeter and 5G Sub-6 GHz Band in Aircraft Environment
Kohsuke Ushimaru, Takashi Hikage, Manabu Omiya, Kazuyuki Morioka, Shunichi Futatsumori
IEICE Transactions on Communications, E108-B, 9, 983, 990, Institute of Electrical and Electronics Engineers (IEEE), 01 Sep. 2025, [Peer-reviewed], [Corresponding author], [International Magazine]
English, Scientific journal, This study proposes a numerical analysis method suitable for EMC evaluations of aircraft. By employing a detailed numerical model that replicates both the external shape and internal structures of an aircraft, combined with large-scale parallel FDTD analysis, the far-field radiation characteristics of a radio altimeter frequency band antenna mounted on the aircraft’s underside were evaluated. The results demonstrate that this approach achieves higher accuracy in EMI evaluations compared to conventional methods. Criteria for determining the appropriate cell size for EMC evaluations in the radio altimeter and 5G Sub-6 GHz frequency bands were also established. Additionally, the study highlights the effectiveness of large-scale FDTD analysis in accurately assessing unwanted radiation and EMI characteristics, such as cross-polarization and upward emissions, providing practical insights for advancing EMC evaluation techniques and aircraft system design.

Histological and inflammatory effects of 26.5 GHz quasi-millimeter wave exposure on rat skin.
Etsuko Ijima, Akiko Nagai, Kun Li, Takashi Hikage, Naomi Kamizawa, Emi Hidaka, Yukina Tsuruta, Tatsuya Ishitake, Hiroshi Masuda
Frontiers in public health, 13, 1580155, 1580155, Jun. 2025, [Peer-reviewed], [International Magazine]
English, Scientific journal, INTRODUCTION: Information regarding the biological effects of localized exposure to quasi-millimeter waves (qMMW) is limited. Given that qMMW exposure can elevate skin temperature and potentially induce thermal injury, further investigation is required. In this study, we aimed to evaluate histological changes and the expression of inflammation-related markers in rat skin tissue locally exposed to 26.5 GHz qMMW, as well as investigate the threshold for inflammatory responses. METHODS: The dorsal skin of rats was locally exposed to 26.5 GHz qMMW at absorbed power densities (APD) of 0, 250, 370, and 500 W/m2 for 18 min using a patch antenna. Histological changes and expression patterns of inflammation-related markers were examined in skin tissue sections exposed to qMMW. Furthermore, serum levels of prostaglandin E2 (PGE2), tumor necrosis factor-α (TNF-α), and interleukin-6 (IL-6) were measured at each post-exposure time point. RESULTS: Histological analysis revealed burn-like tissue damage in the 500 W/m2 exposure group, characterized by subepidermal blister formation, epidermal thickening, and dermal edema, which increased in severity over time. Conversely, the lower exposure groups (250 and 370 W/m2) showed no distinct morphological changes, similar to the sham group. The 500 W/m2 group exhibited significantly elevated expression of inducible nitric oxide synthase (iNOS) and ionized calcium-binding adapter molecule 1 (Iba1), particularly in the dermis, dermal white adipose tissue, and sebaceous glands. Serum levels of PGE2 increased in a dose-dependent manner at 24 and 72 h; TNF-α and IL-6 remained undetectable. The skin temperature increased during qMMW exposure, reaching 39.0 ± 0.6°C, 42.4 ± 0.9°C, and 44.8 ± 1.2°C at APDs of 250, 370, and 500 W/m2, respectively. DISCUSSION: Localized exposure of rat skin to qMMW induces burn-like tissue degeneration and triggers an inflammatory response. This effect may be thermally induced by qMMW irradiation, with the threshold estimated to range between 370 and 500 W/m2 APD under the present experimental conditions. Few studies have demonstrated MMW-induced inflammatory responses in the skin. To the best of our knowledge, this is the first study to clearly define the threshold using APD as a reference. These findings may contribute useful evidence for future revisions of exposure guidelines.

Enhanced Far-Field Estimation for Precise EMI Characterization in Aircraft Radio Altimeter Frequency Bands Using Advanced Parallel FDTD Analysis
USHIMARU Kohsuke, HIKAGE Takashi, OMIYA Manabu, MORIOKA Kazuyuki, FUTATSUMORI Syunichi
電子情報通信学会論文誌 C, Vol.J108–C, No.5, 150, 152, May 2025, [Peer-reviewed], [Corresponding author]
Japanese, This paper evaluates EMI from aircraft leakage waves using high-accuracy far-field estimation through large-scale parallel FDTD analysis. It focuses on radiation from radio altimeter antennas, considering re-radiation of intruding waves within the aircraft, to achieve precise far-field estimations and better understand EMI characteristics.

Single exposure to near-threshold 5G millimeter wave modifies restraint stress responses in rats
Akiko Matsumoto, Ikumi Endo, Etsuko Ijima, Akimasa Hirata, Sachiko Kodera, Masayoshi Ichiba, Mikiko Tokiya, Takashi Hikage, Hiroshi Masuda
Environmental Health and Preventive Medicine, 30, 33, 33, Japanese Society for Hygiene, May 2025, [Peer-reviewed], [International Magazine]
English, Background: In response to growing concerns about the health effects of quasi-millimeter waves (qMMW) used in 5th-generation wireless systems, conservative whole-body exposure thresholds based on indirect evidence have been proposed. The guidelines define a whole-body average specific absorption rate (WBA-SAR) of 4 W/kg which causes a 1 °C increase in core temperature, as the operational threshold for adverse health effects. To address the lack of direct evidence, we recently reported that a 30-minute exposure to qMMW at 4.6 W/kg resulted in a 1 °C increase in rat core temperature. Here, we further analyzed the near-threshold stress response for the first time, using biological samples from the aforementioned and additional experiments.

Methods: A total of 59 young Sprague-Dawley rats (240–322 g) were exposed to 28 GHz for 40 minutes at WBA-SARs of 0, 3.7, and 7.2 W/kg, under normal (22.5 °C, 45–55% humidity), and heat (32 °C, 70% humidity) conditions. Rats were restrained in acrylic holders for dose control. We repeatedly measured serum and urinary biomarkers of stress response, aggregated the data, and analyzed them using a single statistical mixed model to subtract the effects of sham exposure and between-subject variation.

Results: Sham exposure induced stress responses, suggesting an effect of restraint. After the subtraction of the sham exposure effect, 28 GHz appeared to induce stress responses as evidenced by elevated serum-free corticosterone 1 or 3 days after the exposure, which was more evident in animals with a change in rectal temperature exceeding 1 °C. Urinary-free catecholamines demonstrated an inhibitory property of 28 GHz frequency exposure on the stress response as evidenced by noradrenaline on the day of exposure. Heat exposure enhanced this effect, suggesting a possible role of noradrenaline in heat dissipation by promoting cutaneous blood flow, a notion supported by the correlation between noradrenaline levels and tail surface temperature, a critical organ for heat dissipation.

Conclusions: This study is the first to demonstrate that qMMW whole-body exposure can alter the stress response as indicated by corticosterone and noradrenaline at near-threshold levels. Our findings may provide insight into the biological basis of the whole-body exposure thresholds in the international guidelines.

Recent Advances and Future Perspective in Computational Bioelectromagnetics for Exposure Assessments.
Yinliang Diao, Wout Joseph, Dragan Poljak, Luca Giaccone, Sachiko Kodera, Ilkka Laakso, Kenichi Yamazaki, Kun Li, Kensuke Sasaki, Emmeric Tanghe, Mario Cvetković, Walid El Hajj, Takashi Hikage, Fatih Kaburcuk, Gernot Schmid, Anna Šušnjara Nejašmić, Thomas Tarnaud, Vitas Anderson, Kenneth R Foster, Theodoros Samaras, Richard A Tell, Soichi Watanabe, Chung-Kwang Chou, Akimasa Hirata
Bioelectromagnetics, 46, 3, e70002, Apr. 2025, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, In the last few decades, extensive efforts have been dedicated to developing computational methods for modeling the interaction of the human body with electromagnetic fields (EMFs). These studies are crucial for the establishment of exposure limits in international standards and guidelines for human protection from EMF, as well as for advancing personalized dosimetry assessment for medical applications using EMF. To summarize the state-of-the-art knowledge in this field, the IEEE International Committee on Electromagnetic Safety (ICES) held an International Workshop on Computational Bioelectromagnetics in February 2024. This review summarizes the technical presentations and discussions from the workshop and was contributed by multiple authors, encompassing topics such as the tissue dielectric property measurement, low-frequency and radio-frequency bioelectromagnetic modeling methods, stochastic modeling in electromagnetic-thermal dosimetry, intercomparison studies, and computational uncertainties. The insights gained from this workshop will guide future research and aid in the development of more accurate and reliable exposure assessment methods.

Novel 60 GHz Band Spatial Synthetic Exposure System for Investigating Thermal Physiological Responses to Simultaneous Localized Millimeter- Wave Exposure at Multiple Skin Points
Sakura Tsuruga, Takashi Hikage, Hiroshi Masuda, Tatsuya Ishitake, Kun Li, Akiko Nagai
URSI Radio Science Letters, 6, 1, 4, International Union of Radio Science (URSI), Dec. 2024, [Peer-reviewed], [Corresponding author]
English, Scientific journal, 33213074

Novel Design of X-Shaped Slot Antenna Backed by a Flat Reflector for 5G Sub-6 GHz Band
Mangseang Hor, Masanobu Hirose, Takashi Hikage
IEEE Access, 12, 168171, 168181, Nov. 2024, [Peer-reviewed], [Last author, Corresponding author]
Scientific journal

Link between Wi-Fi, cordless devices, mobile phone usage patterns, and behavioral problems among Japanese children: A prospective cohort study.
Ammara Ajmal, Keiko Yamazaki, Naomi Tamura, Yu Ait Bamai, Toshio Yoshikawa, Takashi Hikage, Atsuko Ikeda, Reiko Kishi
Environmental research, 261, 119715, 119715, 02 Aug. 2024, [Peer-reviewed], [International Magazine]
English, Scientific journal, BACKGROUND: With the recent advent of technology, it is important to confirm the health and safety of the youth. This study aimed to prospectively evaluate the relationship between Wi-Fi, cordless phones, and mobile phone usage patterns and behavioral problems. METHODS: This study involved 2465 children aged 8-17 years from the Hokkaido Study on Environment and Children's Health from October 2020 to January 2021, with a follow-up from September 2021 to March 2022. The mother-child dyad provided information on the presence of residential Wi-Fi and cordless phones, cordless phone call duration, and mobile phone usage pattern (duration of calls using mobile network and internet, online audio streaming, online video streaming, and playing online games) via a baseline questionnaire. Based on the scores on Strength and Difficulties Questionnaire at baseline and follow-up, the children were categorized into four groups: normal, persistent, improved, and concurrent. RESULTS: No significant association was found between Wi-Fi, mobile phone calls via mobile networks, and behavioral problems. Cordless phone at home had higher odds for improvement in total difficulty scores, and cordless phone for calling more than 4 min per week had lower odds of persistent problematic prosocial behavior. Longer duration of mobile phone calling via the internet (>40 min/week) had higher odds of concurrent total difficulties. Mobile phone calling via mobile network for <5 min per week had higher odds for improved total difficulty scores. Audio streaming via mobile phones for 60-120 min had lower odds of persistent total difficulties. CONCLUSION: Our results showed sporadic findings between residential RF-EMF indoor sources and mobile phone usage pattern. These observed findings could be affected by residual confounding and chance findings. Ongoing follow-up studies are necessary to further explore this association through detailed exposure assessment and addressing the potential limitations of our study.

A study on gain and bandwidth enhancement of 4×4 planar array of X-shaped slot antenna within millimeter wave frequency band
Hor Mangseang, Hikage Takashi
IEICE Communications Express, 13, 6, 176, 180, The Institute of Electronics, Information and Communication Engineers, 01 Jun. 2024, [Peer-reviewed], [Last author, Corresponding author]
English, This paper introduces a newly designed X-shaped slot antenna with high gain and wideband characteristics for use in mm-wave frequency band. The X-shaped slot antenna serves as radiating elements of planar array configuration for high gain. The 4×4 configuration is investigated in this paper. According to simulation results, the 4×4 planar array exhibits a -9.7 dB impedance bandwidth within the range of 26.1-31 GHz and a maximum gain of 18.2 dBi. Furthermore, gain and bandwidth enhancement of the array antenna is studied. As the results, the antenna shows an impedance bandwidth within the range of 25.35-25.95 GHz, and 26.8-30.2 GHz. Within this band the antenna realized gain is ranging from 17.5-20 dBi.

Numerical Estimation of the Correlation between Temperature Rise due to Medical Metal Plate Implants and Spatial Averaging Dimensions of Local SAR When Exposed to Mobile Phone Frequency Band Radiation
脇修平, 日景隆, 長岡智明
電子情報通信学会論文誌 C(Web), Vol.J107-C, No.4, 89, 97, Apr. 2024, [Peer-reviewed], [Corresponding author]
Japanese, The temperature increase in biological tissue when a human body with implanted metal plates was exposed to radio waves was evaluated. The numerical estimation based on the FDTD method was performed to calculate the local SAR enhancement. The temperature distribution in the tissue was estimated by solving the bioheat transfer equation using the obtained SAR as the heat source. As a result, due to the difference between SAR distribution and temperature distribution, 0.1 g averaged SAR is highly correlated with temperature rise.

Development and International Standardization of HAPS Radio Propagation Models
表英毅, 佐藤彰弘, 木村翔, 田中翔馬, LIN Ho Yu, 日景隆, 山里敬也
電子情報通信学会論文誌 B(Web), J106-B, 11, 677, 695, 電子情報通信学会, Nov. 2023, [Peer-reviewed]
Japanese, High-Altitude Platform Station (HAPS) is attracting much attention as a new mobile communication platform for ultra-wide coverage areas and disaster-resilient networks. To design efficient cell configurations for HAPS-based services, we need radio propagation models that take into consideration the radio propagation environment required for HAPS. ITU-R Recommendation P.1409-1, an existing “radio propagation prediction method” for HAPS, does not cover the environments. ITU-R has established Corresponding Group 3J-3K-3M-14 to study radio propagation models for HAPS, and is discussing the international standardization of such models. In this paper, we report the status of the international standardization of radio propagation models for HAPS.

Parameter variation effects on millimeter wave dosimetry based on precise skin thickness in real rats.
Kun Li, Takashi Hikage, Hiroshi Masuda, Etsuko Ijima, Akiko Nagai, Kenji Taguchi
Scientific reports, 13, 1, 17397, 17397, Springer Science and Business Media LLC, 13 Oct. 2023, [Peer-reviewed], [International Magazine]
English, This study presents a parametric analysis of the steady-state temperature elevation in rat skin models due to millimeter wave exposure at frequencies from 6-100 GHz. The statistical data of the thickness of skin layers, namely epidermis, dermis, dermal white adipose tissue, and panniculus carnosus, were measured for the first time using the excised tissues of real male Sprague-Dawley rats. Based on the precise structure obtained from the histological analysis of rat skin, we solve the bioheat transfer equation to investigate the effects of changes in parameters, such as body parts and thermal constants, on the absorbed power density and temperature elevation of biological tissues. Owing to the notably thin dermal white adipose tissue layer, the surface temperature elevation in the rat head and dorsal skin at 6-100 GHz is 52.6-32.3% and 83.3-58.8% of the average values of different human skin models, respectively. Our results also reveal that the surface temperature elevation of rat skin may correlate with the tissue thickness and deep blood perfusion rates.

Intensity-dependent Temperature Rise Induced by Local Exposure to 26.5 GHz Quasi-Millimeter-Wave in Rat
ETSUKO IJIMA, KUN LI, TAKASHI HIKAGE, AKIKO NAGAI, YASUTAKA MURAKAMI, TAKUJI ARIMA, TATSUYA ISHITAKE, HIROSHI MASUDA
In Vivo, 37, 5, 2092, 2099, Anticancer Research USA Inc., 31 Aug. 2023, [Peer-reviewed], [International Magazine]
English, BACKGROUND/AIM: The widespread use of fifth-generation 5G millimeter-waves (MMW) generates concern about potential adverse health effects. The latest international guidelines for MMW exposure adopt an absorbed power density (APD) of 200 W/m2 to avoid a local temperature rise of 5°C in human tissues as an operational adverse health effect threshold. However, because APD is estimated by simulations using human tissue models, it is unknown whether a similar value can be confirmed for living tissues. The aim of this study was to investigate the relationship between APD and skin temperature rise in vivo, and to validate the estimated values. MATERIALS AND METHODS: The rat dorsal skin was locally exposed to a 26.5 GHz quasi-MMW (qMMW) for 18 min using a patch antenna. The qMMW exposure intensities estimated by dosimetry were set to 0-500 W/m2 of APD. The temperatures in the dorsal skin and rectum were simultaneously measured during exposure. RESULTS: The qMMW-induced local temperature increase at different sites. The dorsal skin temperature increased by approximately 11.3°C at a maximum intensity of 500 W/m2, but the rectal temperature increased by only 0.6°C, indicating highly localized effects of exposure to rats. A significant correlation was observed between APD and skin temperature rise. The relationship provided a linear regression model, and a temperature rise of less than 5°C was estimated in the skin exposed to 200 W/m2 of APD. CONCLUSION: These results suggest that the operational threshold for the MMW exposure guidelines is valid under the present experimental conditions using rats.

Human Body Blockage Characteristics Estimation on Personal Exposure Meter for Epidemiologic Research on RF Exposure and Adolescent Health
杉村海渡, 山本康平, 日景隆, 山崎圭子, 田村菜穂美, 宮下ちひろ, 岸玲子
電子情報通信学会論文誌 B(Web), J106-B, 8, 640, 642, 電子情報通信学会, Aug. 2023, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal, In order to achieve precise dosimetry analysis for epidemiologic research on RF exposure and adolescent health, we evaluate human body blockage characteristics on RF measurement due to deploying a personal exposure meter device near the subject's body, based upon FDTD analysis and actual measurements using an adolescent human phantom.

FDTD Simulation for Specific Absorption Rate Enhancement Due to Metallic Plate Implants with Screw Holes at Mobile Radio Frequency Bands
西川拓次, 日景隆, 長岡智明
電子情報通信学会論文誌 C(Web), J106-C, 5, 180, 186, May 2023, [Peer-reviewed], [Corresponding author]
Japanese, We have clarified the mechanism of the local SAR increases when two metal plates embedded in parallel inside the human body are exposed to electromagnetic waves. The numerical analysis was performed to obtain the SAR distributions in the gap of two plates, and the results show that the resonance phenomenon is caused at a specific polarization and when the wavelength ratio to the metal plate length is an integer multiple. In addition, we compared two models, one is a simple rectangular shape and the other is imitating an actual medical plate and found that the same mechanism can be explained.

Cross-sectional associations between early mobile device usage and problematic behaviors among school-aged children in the Hokkaido Study on Environment and Children's Health.
Chihiro Miyashita, Keiko Yamazaki, Naomi Tamura, Atsuko Ikeda-Araki, Satoshi Suyama, Takashi Hikage, Manabu Omiya, Masahiro Mizuta, Reiko Kishi
Environmental health and preventive medicine, 28, 22, 22, The Japanese Society for Hygiene, Apr. 2023, [Peer-reviewed], [International Magazine]
English, Scientific journal, BACKGROUND: Concerns have been raised about the adverse health impacts of mobile device usage. The objective of this cross-sectional study was to examine the association between a child's age at the first use of a mobile device and the duration of use as well as associated behavioral problems among school-aged children. METHODS: This study focused on children aged 7-17 years participating in the Hokkaido Study on Environment and Children's Health. Between October 2020 and October 2021, the participants (n = 3,021) completed a mobile device use-related questionnaire and the strengths and difficulties questionnaire (SDQ). According to the SDQ score (normal or borderline/high), the outcome variable was behavioral problems. The independent variable was child's age at first use of a mobile device and the duration of use. Covariates included the child's age at the time of survey, sex, sleep problems, internet addiction, health-related quality of life, and history of developmental concerns assessed at health checkups. Logistic regression analysis was performed for all children; the analysis was stratified based on the elementary, junior high, and senior high school levels. RESULTS: According to the SDQ, children who were younger at their first use of a mobile device and used a mobile device for a longer duration represented more problematic behaviors. This association was more pronounced among elementary school children. Moreover, subscale SDQ analysis showed that hyperactivity, and peer and emotional problems among elementary school children, emotional problems among junior high school children, and conduct problems among senior high school children were related to early and long usage of mobile devices. CONCLUSIONS: Elementary school children are more sensitive to mobile device usage than older children, and early use of mobile devices may exacerbate emotional instability and oppositional behaviors in teenagers. Longitudinal follow-up studies are needed to clarify whether these problems disappear with age.

Interference Voltage Estimation for Implantable Cardiac Pacemaker Electromagnetic Interference at Fourth-Generation (4G) and Fifth-Generation (5G) Sub-6 GHz Cellular Frequency Bands
Shuhei Waki, Takuji Nishikawa, Takashi Hikage, Manabu Yamamoto
URSI Radio Science Letters, 4, 1, 3, International Union of Radio Science (URSI), Apr. 2023, [Peer-reviewed], [Corresponding author], [International Magazine]
English, Scientific journal, Experimental and numerical interference voltage estimations for the active implantable
medical device electromagnetic interference due to the
state-of-the-art cellular frequency bands are presented.
A numerical model of a human torso phantom with a
pacemaker was constructed for the finite element
method simulation, and the interference voltage characteristics induced at the pacemaker connector at
fourth-generation and fifth-generation sub-6 GHz bands
were obtained. We confirmed the validity of the
numerical results by comparing simulation results and
measured interference voltages

子どものスクリーンタイムと聴覚・視覚ワーキングメモリーとの関連 北海道スタディ
田村 菜穂美, 山崎 圭子, 宮下 ちひろ, 池田 敦子, 日景 隆, 水田 正弘, 大宮 学, 竹鼻 美月, 赤坂 梨莉花, 岸 玲子
日本衛生学雑誌, 78, Suppl., S172, S172, (一社)日本衛生学会, Mar. 2023
Japanese

学童期の子どもの電磁波曝露実態の変化 北海道スタディ
山崎 圭子, 宮下 ちひろ, 田村 菜穂美, 池田 敦子, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
日本衛生学雑誌, 78, Suppl., S215, S215, (一社)日本衛生学会, Mar. 2023
Japanese

Whole-Body Exposure System Using Horn Antennas With Dielectric Lens at 28 GHz
Sachiko Kodera, Norika Miura, Yinliang Diao, Miyako Inoue, Takashi Hikage, Kenji Taguchi, Hiroshi Masuda, Akimasa Hirata
IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology, 7, 1, 65, 72, Institute of Electrical and Electronics Engineers ({IEEE}), Mar. 2023, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal

Excessive whole-body exposure to 28 GHz quasi-millimeter wave induces thermoregulation accompanied by a change in skin blood flow proportion in rats.
Etsuko Ijima, Sachiko Kodera, Akimasa Hirata, Takashi Hikage, Akiko Matsumoto, Tatsuya Ishitake, Hiroshi Masuda
Frontiers in public health, 11, 1225896, 1225896, Frontiers Media SA, 2023, [Peer-reviewed], [International Magazine]
English, INTRODUCTION: Limited information is available on the biological effects of whole-body exposure to quasi-millimeter waves (qMMW). The aim of the present study was to determine the intensity of exposure to increase body temperature and investigate whether thermoregulation, including changes in skin blood flow, is induced in rats under whole-body exposure to qMMW. METHODS: The backs of conscious rats were extensively exposed to 28 GHz qMMW at absorbed power densities of 0, 122, and 237 W/m2 for 40 minutes. Temperature changes in three regions (dorsal and tail skin, and rectum) and blood flow in the dorsal and tail skin were measured simultaneously using fiber-optic probes. RESULTS: Intensity-dependent temperature increases were observed in the dorsal skin and the rectum. In addition, skin blood flow was altered in the tail but not in the dorsum, accompanied by an increase in rectal temperature and resulting in an increase in tail skin temperature. DISCUSSION: These findings suggest that whole-body exposure to qMMW drives thermoregulation to transport and dissipate heat generated on the exposed body surface. Despite the large differences in size and physiology between humans and rats, our findings may be helpful for discussing the operational health-effect thresholds in the standardization of international exposure guidelines.

Measurement of personal radio frequency exposure in Japan: The Hokkaido Study on the Environment and Children's health
Keiko Yamazaki, Atsuko Ikeda-Araki, Chihiro Miyashita, Naomi Tamura, Toshio Yoshikawa, Takashi Hikage, Manabu Omiya, Masahiro Mizuta, Miwa Ikuyo, Kazuhiro Tobita, Teruo Onishi, Masao Taki, Soichi Watanabe, Reiko Kishi
ENVIRONMENTAL RESEARCH, 216, Pt 1, 114429, 114429, Jan. 2023, [Peer-reviewed], [International Magazine]
English, Scientific journal

Propagation Loss Model with Human Body Shielding for High-Altitude Platform Station Communications
OMOTE Hideki, SATO Akihiro, KIMURA Sho, TANAKA Shoma, LIN HoYu, HIKAGE Takashi
IEICE Transactions on Communications, E105.B, 10, 1219, 1230, The Institute of Electronics, Information and Communication Engineers, 01 Oct. 2022, [Peer-reviewed]
English, In recent years, High-Altitude Platform Station (HAPS) has become the most interesting topic for next generation mobile communication systems, because platforms such as Unmanned Aerial Vehicles (UAVs), balloons, airships can provide ultra-wide coverage, up to 200km in diameter, from altitudes of around 20 km. It also offers resiliency to damage caused by disasters and so ensures the stability and reliability of mobile communications. In order to further integrate HAPS with existing terrestrial mobile communication networks in providing mobile services to users, radio wave propagation models such as terrain, vegetation loss, human shielding loss, building entry loss, urban/suburban areas must be taken into consideration when designing HAPS-based cell configurations. This paper proposes a human body shielding propagation loss model that considers the basic signal attenuation by the human body at high elevation angles. It also analyzes the effect of changes in actual urban/suburban environments due to the arrival of multipath radio waves for HAPS communications in the frequency range of 0.7 to 3.3GHz. Measurements in actual urban/rural environments in Japan and actual stratospheric base station measurements in Kenya are carried out to confirm the validity of the proposed model. Since the measured results agree well with the results predicted by the proposed model, the model is good enough to provide estimates of human loss in various environments.

Development of Novel 60 GHz Band Spatial Synthetic Exposure Set-up for Studies on Thermal Thresholds of Biological Effects
Ozaki Ryunosuke, Hikage Takashi, Taguchi Kenji, Kashiwa Tatsuya, Inoue Miyako, Masuda Hiroshi, Ishitake Tatsuya
IEEJ Transactions on Fundamentals and Materials, 142, 6, 250, 256, The Institute of Electrical Engineers of Japan, 01 Jun. 2022, [Peer-reviewed], [Corresponding author]
Japanese, A novel 60 GHz band exposure set-up has been newly developed for studies on thermal thresholds of biological effects of humans exposed to millimeter waves (MMW) that are 5th generation wireless systems (5G) and beyond-5G candidate frequency bands. To achieve high duty exposure to 60 GHz at the desired area, the authors proposed a spatial synthetic beam-type exposure set-up consists of dielectric lens antennas that can irradiate focused beam. We applied orthogonalizing polarized feeding structure to eliminate interference fringes generated in the exposure area due to the combined two-directional beam radiations. Using FDTD simulation, electromagnetic fields distributions on the exposure area due to incident angles of the combined beams was estimated. In order to obtain exposure characteristics, we achieved exposure experiments of temperature rise measurements using a physical arm-shaped skin phantom and human forearm. The developed set-up enabled efficient and desired exposure control for the experiments to explore the biological effects of local exposure to MMWs on human volunteers.

Interference-Induced Voltage Estimation of Implantable Medical Devices near Electric and Magnetic Field Antennas in Sub-6 GHz / 5G Frequency Band
OHTSUKA Atsuki, HIKAGE Takashi, ISHIOKA Ryota, HIGASHIYAMA Junji, IYAMA Takahiro, SUZUKI Yasunori
IEICE transactions on electronics, J105-C, 5, 157, 166, IEICE - Institute of the Electronics, Information and Communication Engineers, 01 May 2022, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal, This paper describes a numerical assessment of implantable medical devices (implantable cardiac pacemaker/implantable defibrillator) electromagnetic interference (EMI) triggered by wireless devices. By using three-dimensional full-wave numerical simulation based on finite element method, interference voltage induced at the connector of pacemaker inside torso phantom that is used for in-vitro EMI assessment is obtained. We discuss EMI characteristics due to irradiation by slot antenna comparing with irradiation by a dipole antenna. Furthermore, in order to validate the simulated results, we achieved measurement of interference voltage induced at pacemaker connector inside test phantom using novel electro-optic sensor installed in a pacemaker mock-up.

Evaluation of Cabin-to-Exterior Propagation Characteristics for Sub-6GHz/5G Using Small Aircraft Model
SATO Ai, HIKAGE Takashi, OMIYA Manabu, FUTATSUMORI Syunichi, KOHMURA Akiko, YONEMOTO Naruto
電子情報通信学会論文誌 C, J105-C, 5, 149, 156, 01 May 2022, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal, We investigate the applicability of large-scale FDTD analysis to estimate precise radio wave propagation characteristics to design a newly developed wireless link system inside and outside aircraft. This paper predicts interference pass loss characteristics from the cabin to an external altimeter's vicinity using a small aircraft model in the 5G sub-6 GHz frequency bands. Applicability of path loss models, namely alpha beta gamma (ABG) or floating intercept (FI) models with their parameters derived from simulation data, are discussed.

A Study on Gain Enhanced Leaf-Shaped Bow-Tie Slot Array Antenna within Quasi-Millimeter Wave Band
HOR Mangseang, HIKAGE Takashi, YAMAMOTO Manabu
IEICE Transactions on Communications, E105.B, 3, 285, 294, The Institute of Electronics, Information and Communication Engineers, 01 Mar. 2022, [Peer-reviewed]
English, Scientific journal, In this paper, a linear array of 4 leaf-shaped bowtie slot antennas is proposed for use in quasi-millimeter wave band. The slot antennas array is designed to operate at 28 GHz frequency band. The leaf-shaped bowtie slot antenna is a type of self-complementary antenna with low profile and low cost of fabrication. The proposed antenna structure offers improvement in radiation pattern, gain, and -10 dB impedance bandwidth. Through out of this paper radiation pattern, actual gain, and -10 dB impedance bandwidth are evaluated by Finite Different Time Domain (FDTD) simulation. Antenna characteristics are analyzed in the frequency range of 27 GHz to 29 GHz. To improve antenna characteristics such as actual gain and -10 dB impedance bandwidth, a dielectric superstrate layer with relative permittivity of 10.2 is placed on top of ground plane of the slot antennas array. Three antenna structures are introduced and compared. With two layers of dielectric superstrate on top of the antennas ground plane, analysis results show that -10 dB impedance bandwidth occupies the frequency range of 27.17 GHz to 28.39 GHz. Therefore, the operational impedance bandwidth is 1.22 GHz. Maximum actual gain of the slot antennas array with two dielectric superstrate layers is 20.49dBi and —3 dB gain bandwidth occupies the frequency range of 27.02 GHz to 28.57 GHz. To validate the analysis results, prototype of the designed slot antennas array is fabricated. Characteristics of the slot antennas array are measured and compared with the analysis results.

A Study on a Wideband Planar Array Antenna Using Both-Sided MIC and Leaf-Shaped Bowtie Slot Antenna
YAMAMOTO Naoya, HIKAGE Takashi, YAMAMOTO Manabu
電子情報通信学会論文誌 B(Web), J105-B, 3, 310, 312, 電子情報通信学会, 01 Mar. 2022, [Peer-reviewed]
Japanese, This letter shows that it is possible to realize the wideband, cross-polarization suppressed planar antenna by constructing the 2×2 element array antenna using Both-sided MIC and Leaf-shaped bowtie slot radiating element.

Reflector Backed Leaf-Shaped Bowtie Slot Antenna Using Quarter-Wave Transformer
HOR Mangseang, YAMAMOTO Naoya, HIKAGE Takashi, YAMAMOTO Manabu, UCHIDA Daisei, SHIRATO Yushi, KITA Naoki
電子情報通信学会論文誌 B(Web), J105-B, 3, 166, 177, 電子情報通信学会, 01 Mar. 2022, [Peer-reviewed]
Japanese, In this paper, we focus on the leaf-shaped bow tie slot antenna as a wideband antenna that is indispensable for the realization of a high-frequency band distributed antenna system. For the case when a reflector is added to make the bidirectional antenna unidirectional, the design takes into consideration the influence of the reflector. For the case when even if the reflector is added, it is shown that the wide band of various antenna characteristics is possible. It is shown that a wide band of impedance characteristics is possible by adopting a quater-wave transformer as a matching circuit for impedance matching and obtaining double resonance characteristics. Measurement of prototype of designed antenna is perfomed in order to validate the effectiveness of the proposed antenna.

Interference-Induced Voltage Estimation of Implantable Medical Devices near Electric and Magnetic Field Antennas in Sub-6 GHz / 5G Frequency Band
大塚敦生, 日景隆, 石岡諒汰, 東山潤司, 井山隆弘, 鈴木恭宜
電子情報通信学会論文誌 C(Web), J105-C, 5, 2022, [Peer-reviewed], [Corresponding author]
Scientific journal

Novel 60 GHz Band Spatial Synthetic Exposure Setup to Investigate Biological Effects of 5G and Beyond Wireless Systems on Human Body.
Takashi Hikage, Ryunosuke Ozaki, Tatsuya Ishitake, Hiroshi Masuda
Frontiers in public health, 9, 777712, 777712, Frontiers Media SA, Dec. 2021, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, The global spread of 5th generation (5G) wireless systems causes some concern about health effects of millimeter waves (MMW). To investigate biological effects of local exposure to 5G-MMW on human body, a novel 60 GHz band exposure setup was developed, and its performance was validated. A spatial synthetic beam-type exposure setup using two dielectric lens antennas was proposed to achieve high intensity 60 GHz irradiation to the target area of human skin. Variety distributions and intensities of electromagnetic fields at the exposed area, which is modified by incident angles of the combined beams, were simulated using finite-difference time-domain methods. The exposure performance we estimated was verified by temperature elevations of surface in a physical arm-shaped silicone phantom during the MMW exposure. The interference fringes generated in the exposed area due to the combined two-directional beam radiations were observed both in the simulation and in the phantom experiment but eliminated by applying an orthogonalizing polarized feeding structure. Under these exposure conditions, the local temperature changes, which could evoke warmth sensations, were obtained at the target area of the human forearm skin, which means the achievement of exposure performance we intended.

Development of Novel 60GHz Band Spatial Synthetic Exposure Setup for Studies on Thermal Perception Thresholds of Biological Effects for 5G and Beyond
尾崎龍之介, 日景隆
電子情報通信学会論文誌 B(Web), J104-B, 7, 648, 649, 電子情報通信学会, Jul. 2021, [Peer-reviewed], [Corresponding author]
Japanese, We have newly developed a novel 60 GHz band exposure setup for studies on thermal perception thresholds of biological effects for 5G and Beyond. To achieve high duty exposure on desired area at 60 GHz required, the authors proposed spatial synthetic type exposure setup consists of lens antennas that can irradiate focused beam. In order to obtain basic exposure performance, we used physical phantom and achieved exposure experiments of temperature rise measurements.

電波へのばく露による児の精神神経発達への影響に関する最近の研究動向 : 文献調査
山崎, 圭子, 荒木, 敦子, 田村, 菜穂美, 寺岡, 友里, 日景, 隆, 水田, 正弘, 大宮, 学, 岸, 玲子
北海道公衆衛生学雑誌, 34, 2, 14, 21, 北海道公衆衛生学会, Mar. 2021, [Peer-reviewed]
Japanese, Scientific journal, 近年，電波ばく露環境は急速に変化していると考えられ，子どもの健康，特に精神神経発達への影響が懸念される．本研究の目的は，胎児期と出生後のばく露による子どもの精神神経発達への影響について先行研究を概観し，今後の研究の方向性を明らかにすることである．胎児期ばく露を扱った７編のうち３編で妊娠中の母の携帯電話使用状況と精神神経発達の間に負の関連が，１編で正の関連が報告されていた．出生後のばく露を扱った22編では，２編を除き，携帯電話使用状況または電波ばく露レベルと精神神経発達との負の関連が報告されていた．今後の研究では，携帯電話や電子機器の使用状況と電波ばく露による影響を独立に検討する必要がある．また，因果関係を考察するために適した前向き研究デザインを用いることが望ましい．さらに電波ばく露の背後にある交絡要因についても慎重に検討する必要がある．
近年，電波ばく露環境は急速に変化していると考えられ，子どもの健康，特に精神神経発達への影響が懸念される．本研究の目的は，胎児期と出生後のばく露による子どもの精神神経発達への影響について先行研究を概観し，今後の研究の方向性を明らかにすることである．胎児期ばく露を扱った７編のうち３編で妊娠中の母の携帯電話使用状況と精神神経発達の間に負の関連が，１編で正の関連が報告されていた．出生後のばく露を扱った22編では，２編を除き，携帯電話使用状況または電波ばく露レベルと精神神経発達との負の関連が報告されていた．今後の研究では，携帯電話や電子機器の使用状況と電波ばく露による影響を独立に検討する必要がある．また，因果関係を考察するために適した前向き研究デザインを用いることが望ましい．さらに電波ばく露の背後にある交絡要因についても慎重に検討する必要がある．

Numerical Investigation on Local SAR Enhancement Mechanism Due to Implanted Medical Metal Plates using FDTD Analysis
伊藤涼音, 大塚敦生, 日景隆, 長岡智明, 和氣加奈子, 渡辺聡一
電子情報通信学会論文誌 B(Web), J104-B, 6, 500, 502, 電子情報通信学会, 2021, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal, Local Specific Absorption Rate (SAR) enhancement mechanism due to implanted metal plates in humans exposed to RF electromagnetic fields are investigated. In some cases, a combination of two metal plates is applied instead of a single plate because of surgical reasons such as space limit, stability, strength, and so on. The main objective of this study is to evaluate RF exposure conditions under which the SAR is enhanced when two metal plates are placed in parallel.

Exposure to Radiofrequency Electromagnetic Field in the High-Frequency Band and Cognitive Function in Children and Adolescents: A Literature Review
Toru Ishihara, Keiko Yamazaki, Atsuko Araki, Yuri Teraoka, Naomi Tamura, Takashi Hikage, Manabu Omiya, Masahiro Mizuta, Reiko Kishi
International Journal of Environmental Research and Public Health, 17, 9179, 1, 20, MDPI AG, Dec. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal

Novel Interference Voltage Measurement for Beam-Type Wireless Power Transfer Using an Electro-Optical Converter for EMI Assessment of Active Implantable Medical Devices
Takashi Hikage
URSI Radio Science Letters, 2, 1, 3, International Union of Radio Science ({URSI}), Nov. 2020, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal

An analytical Study on Estimation Method of Human Body Blockage Characteristics in 26 GHz Band In-Door Propagation Using Numerical Simulation
Masakazu YAMAGISHI, Takashi HIKAGE, Nobuaki KUNO, Mitsuki NAKAMURA, Wataru YAMADA, Yasushi TAKATORI
電子情報通信学会論文誌 C, Vol.J102-C, No.5, 131, 138, 10 May 2019, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal

Numerical estimation of propagation path loss for wireless link design of WAIC systems installed on outside aircraft cabin based on large-scale FDTD simulation
Tetsuya Sekiguchi, Takashi Hikage, Manabu Yamamoto, Toshio Nojima, Shunichi Futatsumori, Kazuyuki Morioka, Akiko Kohmura, Naruto Yonemoto
IEICE Communications Express, Vol. 8, Iss. 5, 129, 134, May 2019, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Analysis of radio altimeter interference due to wireless avionics intra- communication systems by using large-scale FDTD method -Investigation on Airbus A320 Class Passenger Aircraft
Shunichi Futatsumori, Kazuyuki Morioka, Akiko Kohmura, Naruto Yonemoto, Takashi Hikage, Tetsuya Sekiguchi, Manabu Yamamoto, Toshio Nojima
Applied Computational Electromagnetics Society Journal, 34, 2, 365, 368, Institute of Electrical and Electronics Engineers Inc., Feb. 2019, [Peer-reviewed]
English

大規模FDTD解析を用いた4.4 GHz帯WAICシステムのための機外観測面における伝搬特性推定
Takashi Hikage
電子情報通信学会論文誌 B, Vol.J102-B, No. 2, 72, 79, 01 Feb. 2019, [Peer-reviewed], [Corresponding author], [Domestic magazines]
Japanese, The aim of this study is to develop an accurate and reliable estimation methodology for propagation characteristics inside and outside aircraft cabins so as to advance the radio link design techniques for WAIC systems. This paper uses the FDTD method and large-scale parallel computing to conduct the world's first study on the propagation characteristics of leakage waves emitted from a transmit antenna inside the aircraft cabin for WAIC system. In this paper, we use Airbus 320-200 as a full-body aircraft cabin model. Leaked EMF distributions created by a 4.4 GHz wireless transmitter are analyzed and propagation characteristics are determined from the analysis results.

Numerical estimation of local specific absorption rate and temperature elevation in a human head model implanted with visual prosthesis system
Takashi Hikage, Toshio Nojima, Eiji Yonezawa, Atsushi Sakai, Kouji Osawa
Transactions of Japanese Society for Medical and Biological Engineering, 55, 1, 32, 38, Japan Soc. of Med. Electronics and Biol. Engineering, 2017, [Peer-reviewed], [Lead author, Corresponding author]
Japanese

FEM Simulations of Implantable Cardiac Pacemaker EMI Triggered by HF-Band Wireless Power Transfer System
Naoki Tanaka, Takashi Hikage, Toshio Nojima
IEICE TRANSACTIONS ON ELECTRONICS, E99C, 7, 809, 812, Jul. 2016, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Active implantable medical device EMI assessment for wireless power transfer operating in LF and HF bands
Takashi Hikage, Toshio Nojima, Hiroshi Fujimoto
PHYSICS IN MEDICINE AND BIOLOGY, 61, 12, 4522, 4536, Jun. 2016, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

FDTD解析による高速鉄道車両内5GHz帯無線接続サービスの伝搬特性推定　　　　　　　　　　　　　　　
白船 雅巳, 日景 隆, 野島 俊雄, 佐々木 元晴, 山田 渉, 杉山 隆利
電子情報通信学会論文誌 B, Vol.J97-B, No.9, 762, 769, Sep. 2014, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal

大規模FDTD解析による航空機内無線LAN端末の経路損失推定
白船雅巳, 日景 隆, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電子情報通信学会論文誌 C, J97-C, No. 5, 197, 200, May 2014, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal

Electromagnetic field propagation characteristics of boeing 777 class large passenger aircraft-Numerical estimation and measurement results at 2 Ghz band
Shunichi Futatsumori, Kazuyuki Morioka, Akiko Kohmura, Narutoc Yonemoto, Masami Shirafune, Takashi Hikage, Toshio Nojima
Annual Review of Progress in Applied Computational Electromagnetics, 2014-January, 119, 123, 2014, [Peer-reviewed]
International conference proceedings

Numerical assessment method for implantable cardiac pacemaker EMI triggered by 10MHz-band wireless power transfer coils
Takuma Suzuki, Takashi Hikage, Toshio Nojima
2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, -, 373, 375, 2013, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Experimental Estimation of EMI from Electronic Article Surveillance on Implantable Cardiac Pacemakers and Implantable Cardioverter Defibrillators:Interference Distance and Clinical Estimation
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, FUKUI Koh, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
BME, 50, 3, 289, 298, Japanese Society for Medical and Biological Engineering, Jun. 2012, [Peer-reviewed], [Corresponding author]
Japanese, Methods and results of in vitro experiments examining the electromagnetic interference (EMI) imposed on active implantable medical devices (AIMDs) by electronic article surveillance (EAS) systems are presented. Examined EAS systems include eleven models provided by four manufacturers. They are classified into four categories according to operating principle, and consist of one magnetic-type system, four acousto-magnetic type systems, five electromagnetic-type systems, and one microwave-type system. Examined AIMDs include five models of implantable cardiac pacemakers and five models of implantable cardioverter defibrillators (ICDs) provided by six manufacturers. These EAS systems and AIMDs are currently available in the Japanese market. The in vitro test system is based upon Irnich's flat torso phantom. The observed EMI on pacemakers is either missing pulses or undesirable generation of asynchronous pulses. The observed EMI on ICDs are inappropriate tachyarrhythmia detection and erroneous delivery of therapy. To summarize the results, in the worst case for pacemakers, interference occurred when approaching the EAS system up to 90 cm and entering the gate of the EAS system. The most significant effect was complete omission of pacing pulse and continuous generation of asynchronous pulses. These were observed when the pacemaker was set at maximum sensitivity. In the worst case for ICDs, interference occurred when approaching the EAS pedestal up to 90 cm within the gate. The most significant effect was inappropriate or inhibited tachyarrhythmia detection at 60 cm. These effects were drastically suppressed when the sensitivity was reduced and when the AIMD was far from the EAS system and magnetic field was attenuated. All AIMDs that experienced EMI returned to normal operation mode upon departing the EAS system.

Estimation Formulas for the Specific Absorption Rate in Humans Exposed to Base-Station Antennas
Marie-Christine Gosselin, Guenter Vermeeren, Sven Kuehn, Valpre Kellerman, Stefan Benkler, Tero M. I. Uusitupa, Wout Joseph, Azeddine Gati, Joe Wiart, Frans J. C. Meyer, Luc Martens, Toshio Nojima, Takashi Hikage, Quirino Balzano, Andreas Christ, Niels Kuster
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, 53, 4, 909, 922, Nov. 2011, [Peer-reviewed]
English

Experimental and numerical investigation of the maximum specific absorption rate in a spherical phantom when operating a mobile phone near a metallic wall
A. Y. Simba, S. Watanabe, T. Hikage, T. Nojima
IET SCIENCE MEASUREMENT & TECHNOLOGY, 5, 6, 225, 230, Nov. 2011, [Peer-reviewed]
English

Effects on rat testis of 1.95-GHz W-CDMA for IMT-2000 cellular phones
Norio Imai, Mayumi Kawabe, Takashi Hikage, Toshio Nojima, Satoru Takahashi, Tomoyuki Shirai
SYSTEMS BIOLOGY IN REPRODUCTIVE MEDICINE, 57, 4, 204, 209, Aug. 2011, [Peer-reviewed]
English

Active implantable medical device EMI assessments for electromagnetic emitters operating in various RF bands
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima
2011 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, 109, 112, IEEE, 2011, [Peer-reviewed], [Lead author, Corresponding author]
English

Basic Construction of Whole-Body Averaged SAR Estimation System Using Cylindrical-External Field Scanning for UHF Plane Wave Irradiation of Human Models
Yoshifumi Kawamura, Takashi Hikage, Toshio Nojima
IEICE TRANSACTIONS ON COMMUNICATIONS, E93B, 10, 2636, 2643, Oct. 2010, [Peer-reviewed], [Corresponding author]
English

Estimation of EMI Impact by Cellular Radio on Implantable Cardiac Pacemakers in Elevator Using EMF Distributions Inside Human Body
Atsushi Kitagawa, Takashi Hikage, Toshio Nojima, Ally Y. Simba, Soichi Watanabe
IEICE TRANSACTIONS ON COMMUNICATIONS, E93B, 7, 1839, 1846, Jul. 2010, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Experimental Quasi-Microwave Whole-Body Averaged SAR Estimation Method Using Cylindrical-External Field Scanning
Yoshifumi Kawamura, Takashi Hikage, Toshio Nojima
IEICE TRANSACTIONS ON COMMUNICATIONS, E93B, 7, 1826, 1833, Jul. 2010, [Peer-reviewed], [Corresponding author]
English

Effects of W-CDMA 1950 MHz EMF Emitted by Mobile Phones on Regional Cerebral Blood Flow in Humans
Yoko Mizuno, Yoshiya Moriguchi, Takashi Hikage, Yasuo Terao, Takashi Ohnishi, Toshio Nojima, Yoshikazu Ugawa
BIOELECTROMAGNETICS, 30, 7, 536, 544, Oct. 2009, [Peer-reviewed]
English

Using Large-Scale FDTD Method to Obtain Precise Numerical Estimation of Indoor Wireless Local Area Network Office Environment
Louis-Ray Harris, Takashi Hikage, Toshio Nojima
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E92A, 9, 2177, 2183, Sep. 2009, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Precise Estimation of Cellular Radio Electromagnetic Field in Elevators and EMI Impact on Implantable Cardiac Pacemakers
Louis-Ray Harris, Takashi Hikage, Toshio Nojima
IEICE TRANSACTIONS ON ELECTRONICS, E92C, 9, 1182, 1187, Sep. 2009, [Peer-reviewed], [Corresponding author]
English

Effects of 915 MHz Electromagnetic-Field Radiation in TEM Cell on the Blood-Brain Barrier and Neurons in the Rat Brain
Masuda, Hiroshi, Ushiyama, Akira, Takahashi, Miyuki, Wang, Jianqing, Fujiwara, Osamu, Hikage, Takashi, Nojima, Toshio, Fujita, Koji, Kudo, Motoshige, Ohkubo, Chiyoji
RADIATION RESEARCH, 172, 1, 66, 73, Jul. 2009, [Peer-reviewed]
English

Precise Measurement of IMD Behavior in 5-GHz HTS Resonators and Evaluation of Nonlinear Microwave Characteristics
Shunichi Futatsumori, Masato Furuno, Takashi Hikage, Toshio Nojima, Akihiko Akasegawa, Teru Nakanishi, Kazunori Yamanaka
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 19, 3, 3595, 3599, Jun. 2009, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Specific Absorption Rates of Anatomically Realistic Human Models Exposed to RF Electromagnetic Fields From Mobile Phones Used in Elevators
Ally Y. Simba, Takashi Hikage, Soichi Watanabe, Toshio Nojima
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 57, 5, 1250, 1259, May 2009, [Peer-reviewed]
English, Scientific journal

A Novel Filter Construction Utilizing HTS Reaction-Type Filter to Improve Adjacent Channel Leakage Power Ratio of Mobile Communication Systems
Shunichi Futatsumori, Takashi Hikage, Toshio Nojima, Akihiko Akasegawa, Teru Nakanishi, Kazunori Yamanaka
IEICE TRANSACTIONS ON ELECTRONICS, E92C, 3, 307, 314, Mar. 2009, [Peer-reviewed], [Corresponding author]
English

In vitro Assessment of Electromagnetic Interference due to Low-Band RFID reader/writers on Active Implantable Medical Devices
Shunichi Futatsumori, Yoshifumi Kawamura, Takashi Hikage, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima
Journal of Arrhythmia, 25, 3, 142, 152, Japanese Heart Rhythm Society, 2009, [Peer-reviewed], [Corresponding author]
English

A 5 GHz high-temperature superconducting reaction-type transmitting filter based upon split open-ring resonators
S. Futatsumori, T. Hikage, T. Nojima, A. Akasegawa, T. Nakanishi, K. Yamanaka
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 21, 4, Apr. 2008, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Estimation Method for Electromagnetic Fields in Echoic Environments Using Large Scale FDTD Analysis and Histogram Representation
ABIKO Yusuke, HARRIS Louis-Ray, HIKAGE Takashi, NOJIMA Toshio, WATANABE Soichi, SHINOZUKA Takashi
The transactions of the Institute of Electronics, Information and Communication Engineers. B, J90-B, 11, 1097, 1105, 一般社団法人電子情報通信学会, Nov. 2007, [Peer-reviewed]
Japanese, Scientific journal, 乗り物やオフィスなどの閉空間内でマイクロ波が発射される場合,壁や床,人体などでの散乱吸収によって内部に多くの多重波が発生して,自由空間内とは性質の異なる複雑な電磁界分布が形成される.このような電磁界分布を精度良く推定することが,例えば閉空間内での携帯電話無線回線設計の面から,またEMCや電波防護の評価を行うために必要である.筆者らは通勤電車内での携帯電話電波による心臓ペースメーカリスク評価法を目的に大規模FDTD(Finite Difference Time Domain)解析法を採用し,また空間内に局所的に点在発生する強い電磁界領域(ホットスポット)を強度について集約的に評価するためにヒストグラムの適用を先に提案している.本論文は,通勤電車に加えて大型旅客機を対象空間に,また無線LANアクセスポイントと携帯電話をマイクロ波発射源として電界に更に磁界分布の解析を行い,心臓ペースメーカリスクに加えて新たに無線LANサービスエリアの評価を行う.人体の存在による影響を含めて,レイトレースなど従来の推定法では困難であった高精度で緻密な電磁界解析と評価ができることを示す.電車内での実験測定により本解析評価法の妥当性を確認する.

HTS split open-ring resonators with improved power-handling capability for reaction-type transmitting filters
S. Futatsumori, T. Hikage, T. Nojima, A. Akasegawa, T. Nakanishi, K. Yamanaka
ELECTRONICS LETTERS, 43, 17, 956, 957, Aug. 2007, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Basic Circuit Construction of Microwave Superconducting Reaction Type Transmitting Filter Using Novel Split Open-Ring Resonator
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio
The transactions of the Institute of Electronics, Information and Communication Engineers. C, J89-C, 5, 266, 273, 一般社団法人電子情報通信学会, May 2006, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal, 高温超伝導体(High-Temperature Superconductor, HTS)の有望なマイクロ波デバイス応用の一つにフィルタがある.HTSフィルタを送信系に適用する場合,電流がデバイスの一部に集中するため耐電力(許容入力)に制限が生じる.本論文では,高Q値を維持しながら電流密度分散可能な構造をもつ新たな分割オープンリング共振器を適用した,マイクロ波送信用超伝導リアクション型フィルタを提案する.はじめに,最も電力の大きい基本波信号成分が共振しないリアクション型フィルタの基本動作を述べ,携帯電話基地局に適用する際の課題を検討する.次に,マイクロストリップ線路を用いた共振器のエッジ部での電流密度減少を可能とする分割オープンリング共振器を提案し,最大電流密度低減効果を電磁界シミュレーションにより示す.その結果を踏まえて,分割オープンリング共振器を適用した三次リアクション型フィルタを設計し,従来のパッチ型共振器を用いたデュアルモードフィルタよりも急しゅんな特性が得られ,耐電力特性向上が達成できることを解析により示し,本フィルタ方式の基本構成法及び実現可能性を検討する.

Microwave superconducting reaction-type transmitting filter using split open-ring resonator
S. Futatsumori, T. Hikage, T. Nojima
ELECTRONICS LETTERS, 42, 7, 428, 430, Mar. 2006, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Electric-field distribution estimation in a train carriage due to cellular radios in order to assess the implantable cardiac pacemaker EMI in semi-echoic environments
T Hikage, T Nojima, S Watanabe, T Shinozuka
IEICE TRANSACTIONS ON COMMUNICATIONS, E88B, 8, 3281, 3286, Aug. 2005, [Peer-reviewed], [Lead author, Corresponding author]
English

Cavity-Backed Slot Antennas and Array with Simple Geometry Adapted to Microwave Energy Transmission　　　　　　　　　　　　　　　
Takashi Hikage, Kousuke Munakata, Toshio Nojima, Manabu Omiya, Kiyohiko Itoh
U.R.S.I. The Radio Science Bulletin, No.310, 23, 28, 2004, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

A Planar-Type Multi-Sector Antenna Consisting of Slot Yagi-Uda Array
KAWAMURA Teruo, YAMAMOTO Manabu, HIKAGE Takashi, ITOH Kiyohiko
The transactions of the Institute of Electronics, Information and Communication Engineers. B, J85-B, 9, 1633, 1643, 一般社団法人電子情報通信学会, Sep. 2002, [Peer-reviewed]
Japanese, Scientific journal, 無線LANシステムでは,マルチパスによる伝送品質の劣化が問題となる.このような劣化を回避する一手法として,マルチセクタアンテナの利用があげられる.設置の容易さなどを考慮すると,突起物のないアンテナを平面配置した平面マルチセクタアンテナを用いることが望ましい.そこで,本論文では,プリントスロット八木・宇田アレーアンテナで構成した平面マルチセクタアンテナを提案する.数値計算(スペクトル領域モーメント法及びFDTD法)を用いて,提案したアンテナの特性評価を行う.これにより,平面構造であるにもかかわらず,セクタ間の相互干渉が極めて小さなマルチセクタアンテナが実現可能であることを示す.また,19GHz帯において,提案したアンテナの試作測定を行い,数値計算による検討結果の妥当性を確認している.

Considerations on performance evaluation of cavity-backed slot antenna using the FDTD technique
T Hikage, M Omiya, K Itoh
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 49, 12, 1712, 1717, Dec. 2001, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Comparison of analysis methods for performance of cavity-backed slot antennas using the FDTD technique
T Hikage, M Omiya, K Itoh
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS, 84, 8, 70, 77, 2001, [Peer-reviewed], [Lead author, Corresponding author]
English

Development of Low-Profile Cavity-Backed Slot Antenna for Microwave Energy Transmission
HIKAGE Takashi, IMADA Mizuki, OMIYA Manabu, ITOH Kiyohiko
The transactions of the Institute of Electronics, Information and Communication Engineers. B, J82-B, 10, 1905, 1914, 一般社団法人電子情報通信学会, Oct. 1999, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, 太陽発電衛星SPS2000では,送電アンテナ素子としてキャビティ付きスロットアンテナを使用することが提案されている.本論文においては,送電アンテナ素子の薄形化を目的として検討を行う.送電アンテナ素子として,終端短絡プローブ給電キャビティ付きスロットアンテナを使用する.このアンテナ素子では,キャビティ高さを低くした場合,キャビティ内部のプローブ位置,スロットの長さ及び幅を適当に設定することによって,送電周波数2.45GHzにおいてインピーダンス整合を実現することができる.本論文では,高さが12mm以下のキャビティ付きスロットアンテナについて,インピーダンス整合を実現する設計法とアンテナパラメータを示す.設計には時間領域差分(FDTD)法を使用し,解析結果と実験結果との比較検討を行う.これら検討から,提案した設計法の有効性を示す.更に,薄形化による特性変化について明らかにする.

Comparison of Analysis Methods for Performance of Cavity-Backed Slot Antennas Using the FDTD Technique
HIKAGE Takashi, OMIYA Manabu, ITOH Kiyohiko
The transactions of the Institute of Electronics, Information and Communication Engineers. B, J82-B, 5, 1038, 1045, 一般社団法人電子情報通信学会, May 1999, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, Scientific journal, キャビティ付きスロットアンテナの特性評価にFDTD法を適用することで, 給電構造を考慮した設計が可能である. 本論文においては, キャビティ付きスロットアンテナの設計・解析に適した給電モデルを明らかにする. 給電モデルとしてギャップ電圧モデル及び同軸モデルを使用し, その解析結果を比較検討する. 入力特性解析結果から, 同軸モデルではギャップ電圧モデルに比較して少ないタイムステップ数で特性評価が可能であることを明らかにした. 放射指向特性評価では, 正弦波励振した場合の絶対利得評価法を示した. 絶対利得解析結果から, 同軸モデルでは15周期程度で値は収束し, その指向性は実験結果と一致すること, ギャップ電圧モデルでは絶対利得の値が振動する現象が観測されることを示した. これら特性評価比較結果から, キャビティ付きスロットアンテナのFDTD解析には, 給電モデルとして同軸モデルが適していることを明らかにした.

Proposal and analysis of cavity-backed slot antennas for microwave energy transmission
T Hikage, N Ohno, M Omiya, K Itoh
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS, 82, 3, 20, 27, Mar. 1999, [Peer-reviewed], [Lead author, Corresponding author]
English

FDTD analysis of mutual coupling of cavity-backed slot antenna array
T Hikage, M Omiya, K Itoh
IEICE TRANSACTIONS ON ELECTRONICS, E81C, 12, 1838, 1844, Dec. 1998, [Peer-reviewed], [Lead author, Corresponding author]
English

Design of cavity-backed slot antennas using the finite-difference time-domain technique
M Omiya, T Hikage, N Ohno, K Horiguchi, K Itoh
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 46, 12, 1853, 1858, Dec. 1998, [Peer-reviewed]
English, Scientific journal

Proposal of Cavity-Backed Slot Antennas for the Microwave Energy Transmission
HIKAGE Takashi, OHNO Norio, OMIYA Manabu, ITOH Kiyohiko
The transactions of the Institute of Electronics, Information and Communication Engineers, J81-B-2, 3, 218, 225, 一般社団法人電子情報通信学会, Mar. 1998, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, 我が国において検討が行われている太陽発電衛星のストローマンモデルであるSPS2000では, 送電アンテナ素子としてキャビティ付きスロットアンテナの利用が提案されている.本論文においては, 初めに送電アンテナ素子に要求される寸法および構造条件を示す.更に, その条件を満足し, 所望のアンテナ特性を実現する給電構造について新たに提案を行う.給電方法として, 終端短絡ブローブ給電素子および逆F給電素子を用いることを提案し, その給電素子パラメータの決定法を解析および実験により明らかにする.但し, 給電構造を考慮したアンテナ特性の解析には, 筆者らによって明らかにされたFDTD解析手法を使用する.

大規模FDTD解析による小型航空機電波高度計の干渉経路損失特性評価—Evaluation of Interference Path Loss Characteristics of Small Aircraft Radio Altimeter by Large-scale FDTD Analysis—電磁環境/半導体電力変換研究会 半導体電力変換,EMC一般
牛丸 皓介, 日景 隆, 大宮 学, 二ッ森 俊一, 電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan, 2025, 7-18, 53, 56, 30 May 2025
東京 : 電気学会, Japanese

自律型海中ロボット等の広域海中電波通信特性評価を目的としたFDTDシミュレーションに関する検討—Study on FDTD Simulation for Evaluating Wide-Area Subsea Radio Communication Characteristics of Autonomous Underwater Vehicles—電磁環境/半導体電力変換研究会 半導体電力変換,EMC一般
清水 智裕, 日景 隆, 電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan, 2025, 7-18, 57, 60, 30 May 2025
東京 : 電気学会, Japanese

Dosimetry Assessment of a Rat Model based on a 60 GHz Spatial Synthetic Exposure Equipment
上田有真, LI Kun, 日景隆, 増田宏, 井島悦子, 永井亜希子, 田口健治, 電子情報通信学会技術研究報告(Web), 124, 436(EMCJ2024 103-115), 2025

Dosimetry Estimation of 60 GHz Millimeter-Wave Exposure for Thermal Physiological Threshold Evaluation
鈴木将太, 日景隆, 増田宏, LI Kun, 永井亜希子, 電子情報通信学会技術研究報告(Web), 125, 27(EST2025 1-6), 2025

Single exposure to near-threshold 5G millimeter wave modifies restraint stress responses in rats
Matsumoto Akiko, Endo Ikumi, Ijima Etsuko, Hirata Akimasa, Kodera Sachiko, Ichiba Masayoshi, Tokiya Mikiko, Hikage Takashi, Masuda Hiroshi, Environmental Health and Preventive Medicine (Web), 30, 2025

Numerical Assessment of SAR Enhancement Due to Implanted Metal Plates under Exposure from Wireless Charging Coils in 6 MHz Frequency Band
Shuhei Waki, Funa Tsumura, Takashi Hikage, Tomoaki Nagaoka, IEICE Proceeding Series, 85, P3-19, 25 Nov. 2024
Metal implants are known for leading the increase of power absorption in the human body when exposed to radiofrequency (RF) electromagnetic fields (EMFs). In our previous studies, we have confirmed and evaluated the enhancement of specific absorption rate (SAR) due to implanted metal plates under exposure of EMFs from a dipole antenna in cellular frequency band. To estimate the worst-case scenario of SAR enhancement due to the metal plates, the precise calculation of SAR under exposure from wireless charging coils at 6 MHz band is presented in this study., The Institute of Electronics, Information and Communication Engineers, English

Interference Induced Voltage Assessment for Electromagnetic Interference on Implantable Medical Devices Due to Magnetic Coupling WPT System at 6 MHz Bands
脇修平, 津村楓奈, 日景隆, 電子情報通信学会技術研究報告(Web), 124, 116(EMCJ2024 32-35), 2024

A study of miniaturized patch array antenna with circular polarization for IoT platform via LEO satellite
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔, 電子情報通信学会大会講演論文集(CD-ROM), 2024, 2024

Radio Altimeter Interference Path Loss Characteristics of Small Size Aircraft During Flight-Measurement and Evaluation Based on Beechcraft B300 Aircraft-
二ッ森俊一, 平賀規昭, 脇修平, 牛丸皓介, 日景隆, 電子情報通信学会大会講演論文集(CD-ROM), 2024, 2024

Evaluation of SAR in Vertical Upward Radio Wave Exposure Using Numerical Phantom Models for Different Ages and Genders
篭橋みのり, 日景隆, 山本学, 電子情報通信学会大会講演論文集(CD-ROM), 2024, 2024

Evaluation Model and Comparative Analysis of Low and Intermediate Frequency Magnetic Field Exposure
日景隆, 佐々木謙介, 椎名健雄, 鈴木敬久, 染野薫, 安永高志, 電気学会基礎・材料・共通部門大会(Web), 2024, 2024

Numerical Assessment of Exposure Polarization Dependency of Temperature Increase and Peak Spatial-Averaged SAR Due to Implanted Medical Metal Plates under Microwave Exposure
脇修平, 津村楓奈, 日景隆, 長岡智明, 電子情報通信学会技術研究報告(Web), 124, 210(EMCJ2024 36-69), 2024

Introduction to the Activities of the Investigating R&D Committee on Recent Trends of Advanced Fundamental Technologies for Assessment of Electromagnetic Field Exposure
鈴木敬久, 日景隆, 佐々木謙介, 椎名健雄, 電気学会基礎・材料・共通部門大会(Web), 2024, 2024

Numerical Estimation of Specific Absorption Rates for 5G Smartphones Using Child and Adolescent Phantom Models
KAGOHASHI Minori, HIKAGE Takashi, NISHIMURA Toshihiko, KASHIWA Tatsuya, YAMAZAKI Keiko, TAMURA Naomi, KISHI Reiko, 電子情報通信学会技術研究報告(Web), 124, 258(EMCJ2024 70-88), 2024

Numerical Assessment of Temperature Increase Due to Implanted Metal Plates from Magnetic Coupling Wireless Power Transfer System in 6 MHz Band
WAKI Shuhei, TSUMURA Funa, HIKAGE Takashi, NAGAOKA Tomoaki, 電子情報通信学会技術研究報告(Web), 124, 258(EMCJ2024 70-88), 2024

High-Precision Estimation of Aircraft Altimeter Radar Propagation Using Parallel FDTD Analysis
牛丸皓介, 日景隆, 大宮学, 二ッ森俊一, 平賀規昭, 米本成人, 河村暁子, 電子情報通信学会大会講演論文集(CD-ROM), 2024, 2024

Characteristics evaluation of miniaturized patch array antenna with circular polarization for IoT platform via LEO satellite
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔, 電子情報通信学会大会講演論文集(CD-ROM), 2024, 2024

Accurate FDTD Simulation for EMI Evaluation of Implantable Cardiac Pacemakers Exposed to 5G Quasi-Millimeter-Wave Frequency Band Radio Waves
津村楓奈, 脇修平, 日景隆, 山本学, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

Characteristics evaluation by prototype measurement of quasi-millimeter wave wideband slot array antenna with double-sided feeding circuit
山田晴大, 日景隆, 山本学, 和井秀樹, 藤田隆史, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

Numerical Estimation of Exposure Polarization Dependency of Temperature Increase Due to Implanted Medical Metal Plates Exposed to Radiofrequency Wave in the Cellular Frequency Band
脇修平, 津村楓奈, 日景隆, 長岡智明, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

Estimation of Body Shielding in the 5G mm-Wave Frequency Band Using a Smoothed Voxel Human Phantom and the Parallel FDTD Method
日下部洸希, 牛丸皓介, 日景隆, 山本学, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

Absorbed Power Density Evaluation of a 60 GHz Spatial Synthesis Exposure System for Investigating the Thermo-Physiology to Millimeter-Wave Localized Exposure at Multiple Points
敦賀桜, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

A study on characteristics evaluation of an array antenna consisting of miniaturized circularly polarized patch antenna for earth sensing platform via LEO satellite
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

High-Resolution Evaluation of Propagation Characteristics of Small Aircraft Radio Altimeter by Large-Scale FDTD Analysis
牛丸皓介, 日景隆, 大宮学, 森岡和行, 二ッ森俊一, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

SAR Evaluation for 5G Smartphones Using Child Phantom Models
篭橋みのり, 日景隆, 西村寿彦, 柏達也, 山崎圭子, 田村菜穂美, 岸玲子, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024, 2024

Estimation of Human Body Blockage Considering Elevation Angle of Exposure Plane-waves in Wireless LAN Frequency Band for Epidemiological Research on RF Exposure and Children’s Health
Sakura Tsuruga, Kaito Sugimura, Takashi Hikage, Manabu Omiya, Keiko Yamazaki, Atuko Ikeda-Araki, Chihiro Miyashita, Naomi Tamura, Reiko Kishi, IEICE Proceeding Series, 79, P2-26, 29 Nov. 2023
In recent years, due to the spread of smartphones and other wireless devices, the age at which children start using these devices has been declining. Consequently, it becomes imperative to investigate the effects of radiofrequency (RF) exposure on children's health, particularly with regard to higher nerve functions. In this study, we evaluate the effects of human body blockage on personal exposure assessment tools in wireless LAN frequency band, using the FDTD method to investigate the dosimetry protocol for epidemiologic research., The Institute of Electronics, Information and Communication Engineers, English

Novel Exposure Setup Using Spatial Synthetic Antennas for Investigation of Thermal Physiology and Cellular Function Changes Induced by Highly Localized Millimeter-Wave Exposure
Kaito Sugimura, Takashi Hikage, Hiroshi Masuda, Tatsuya Ishitake, Kun Li, Akiko Nagai, IEICE Proceeding Series, 79, P2-21, 29 Nov. 2023
For the upcoming Beyond-5G and 6G utilization, there is a lack of biological evidence regarding the safety of exposure to millimeter-wave radiation for humans. It is crucial to research to establish biologically plausible effects and obtain reliable experimental data to ascertain the international guidelines on the safety of radio wave exposure in frequency bands higher than the millimeter-wave range. In this paper, we focus on the 60 GHz band and develop a new exposure setup using spatial synthesis techniques. As a result, we confirm that achieving sufficient exposure intensity in the desired area is possible., The Institute of Electronics, Information and Communication Engineers, English

A Design of Quasi-Millimeter Wave Wideband Slot Array Antenna with Double-Sided Feeding Circuit and Leaf-Shaped Bowtie Slot Element
Yoshiki Ono, Takashi Hikage, Manabu Yamamoto, Shuki Wai, Naoki Kita, IEICE Proceeding Series, 79, P1-24, 29 Nov. 2023
The authors have previously designed a wideband planar array antenna for applications in UWB wireless, using a leaf-shaped bowtie slot element and a double-sided feeding circuit, and have revealed its characteristics. In this paper, using a similar configuration, a 16-element wideband slot array antenna intended for application in the quasi-millimeter wave band (28 GHz band) is designed, and the results of its performance evaluation through numerical simulations are reported., The Institute of Electronics, Information and Communication Engineers, English

Numerical Evaluation of Averaging Mass for Local Specific Absorption Rate Enhancement in Human Tissue with Implanted Metal Plates Exposed to Radio Frequency Waves in the Cellular Frequency Band
Shuhei Waki, Funa Tsumura, Takashi Hikage, Tomoaki Nagaoka, IEICE Proceeding Series, 79, P2-23, 29 Nov. 2023
Metal implants in the human body have been suggested to increase the localized Specific Absorption Rate (SAR) when exposed to radiofrequency (RF) electromagnetic fields. In our previous studies, we confirmed and evaluated the SAR enhancement caused by metal implants using both numerical simulations and measurements. To establish a correlation between the temperature increase and SAR enhancement in the human tissue around implanted metal plates, we conducted a precise examination of the averaged mass dependencies of the local SAR on the temperature rise in this study., The Institute of Electronics, Information and Communication Engineers, English

Numerical Estimations of Specific Absorption Rates for Vertical Exposure Using Anatomical Phantom Models Across Different Ages and Genders
Minori Kagohashi, Takashi Hikage, Manabu Yamamoto, IEICE Proceeding Series, 79, P2-25, 29 Nov. 2023
The UHF-band passive digital tag systems system has been changed, and the use environment is becoming more and more diversified. This means that the general public is more likely to approach the source of radio wave radiation. Therefore the evaluation of human protection and EMC (Electromagnetic Compatibility) is required. In this report, we evaluated SAR (Specific Absorption Rate) for exposure to the human body from below using electromagnetic field simulation based on the FDTD (Finite Difference Time Domain) method and anatomical numerical human bodies of different ages and sexes. We calculated whole-body average SAR for 4 human models at 800MHz and 2GHz. Although the whole-body average SAR values for each model were different, they did not exceed the basic limits of ICNIRP guidelines for all models., The Institute of Electronics, Information and Communication Engineers, English

Human Body Blockage Effects on Personal Exposimeter Device in 4G/5G Frequency Bands for Epidemiological Research on Children’s Health
Sakura Tsuruga, Manabu Omiya, Chihiro Miyashita, Kaito Sugimura, Keiko Yamazaki, Naomi Tamura, Takashi Hikage, Atsuko Ikeda-Araki, Reiko Kishi, 2023 IEEE International Symposium On Antennas And Propagation (ISAP), 1, 2, 30 Oct. 2023
IEEE

Novel Vertically Exposure System Using Spatial Synthetic Antennas to Investigate Thermo-Physiological and Cellular Function Changes Induced by Millimeter-Wave Exposure
Kaito Sugimura, Tatsuya Ishitake, Takashi Hikage, Kun Li, Hiroshi Masuda, Akiko Nagai, 2023 IEEE International Symposium On Antennas And Propagation (ISAP), 1, 2, 30 Oct. 2023
IEEE

Interference-Induced Voltage Estimation for EMI Characteristics Evaluation of Implantable Medical Devices Exposed to 5G Frequency Radio Waves
Funa Tsumura, Takahiro Iyama, Shuhei Waki, Junji Higashiyama, Takashi Hikage, Yasunori Suzuki, 2023 IEEE International Symposium On Antennas And Propagation (ISAP), 1, 2, 30 Oct. 2023
IEEE

Propagation Characteristics Estimation for Indoor 5G Wireless Environment Including Human Body Shielding Using Parallel FDTD Method
Kohsuke Ushimaru, Takashi Hikage, Manabu Yamamoto, Manabu Omiya, 2023 IEEE International Symposium On Antennas And Propagation (ISAP), 1, 2, 30 Oct. 2023
IEEE

Change of radiofrequency electromagnetic exposure of children from 2020 to 2021: A report from Hokkaido Study
Keiko Yamazaki, Naomi Tamura, Chihiro Miyashita, Toshio Yoshikawa, Atsuko Ikeda-Araki, Takashi Hikage, Manabu Omiya, Masahiro Mizuta, Miwa Ikuyo, Kazuhiro Tobita, Teruo Onishi, Masao Taki, Soichi Watanabe, Reiko Kishi, 2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 1, 2, 19 Aug. 2023
IEEE

X-Shaped Slot Antenna for Sub-6 GHz 5G Application
Mangseang Hor, Masanobu Hirose, Takashi Hikage, 2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 1, 3, 19 Aug. 2023
IEEE

2×2 Planar Array of X-Shaped Slot Antennas for Millimeter Wave Frequency Band
Mangseang Hor, Masanobu Hirose, Takashi Hikage, 2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI), 1407, 1408, 23 Jul. 2023
IEEE

Interference Voltage Measurement for EMI Evaluation of Active Implantable Medical Devices by Exposure to 4G and 5G Frequency Radio Waves using Electro-Optical Converter
西川拓次, 日景隆, 井山隆弘, 東山潤司, 鈴木恭宜, 電子情報通信学会技術研究報告(Web), 122, 372(EMCJ2022 72-91), 2023

Estimation of Human Blockage Characteristics for Indoor Propagation in a Local-5G Frequency Band Using Large Scale FDTD Analysis
吉田総希, 日景隆, 大宮学, 電子情報通信学会技術研究報告(Web), 122, 372(EMCJ2022 72-91), 2023

Performance Evaluation of 60 GHz Exposure Set-up for Study of Changes in Thermal Physiology and Cellular Mechanisms Induced by Localized Millimeter-wave Exposure
山本康平, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子, 電子情報通信学会技術研究報告(Web), 122, 372(EMCJ2022 72-91), 2023

子どものスクリーンタイムと聴覚・視覚ワーキングメモリーとの関連:北海道スタディ
田村菜穂美, 山崎圭子, 宮下ちひろ, 池田敦子, 池田敦子, 日景隆, 水田正弘, 大宮学, 竹鼻美月, 赤坂梨莉花, 岸玲子, 日本衛生学雑誌(Web), 78, Supplement, 2023

学童期の子どもの電磁波曝露実態の変化-北海道スタディ
山崎圭子, 宮下ちひろ, 田村菜穂美, 池田敦子, 池田敦子, 日景隆, 水田正弘, 大宮学, 岸玲子, 日本衛生学雑誌(Web), 78, Supplement, 2023

Cross-sectional associations between early mobile device usage and problematic behaviors among school-aged children in the Hokkaido Study on Environment and Children’s Health
Miyashita Chihiro, Yamazaki Keiko, Tamura Naomi, Ikeda-Araki Atsuko, Ikeda-Araki Atsuko, Suyama Satoshi, Hikage Takashi, Omiya Manabu, Mizuta Masahiro, Kishi Reiko, Environmental Health and Preventive Medicine (Web), 28, 2023

Development of a Numerical Model of 60 GHz Band Lens Antenna for the Study of Thermo-Physiological and Cellular Function Changes Induced by Millimeter-Wave Exposure
Kohei Yamamoto, Takashi Hikage, Hiroshi Masuda, Tatsuya Ishitake, Kun Li, Akiko Nagai, 2022 International Symposium on Antennas and Propagation (ISAP), 277, 278, 31 Oct. 2022
IEEE

Propagation Loss Characteristics Considering Human Body Shadowing in Local 5G Frequency Band Using Parallel FDTD Analysis
Kazuki Yoshida, Takashi Hikage, Manabu Omiya, 2022 International Symposium on Antennas and Propagation (ISAP), 283, 284, 31 Oct. 2022
IEEE

A Novel 60 GHz Spatial Synthetic Exposure Set-up for the Study of Thermal Perception Thresholds for Biological Effects of 5G and Beyond Wireless Systems
Kohei Yamamoto, Takashi Hikage, Hiroshi Masuda, Tatsuya Ishitake, Kun Li, Akiko Nagai, 2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), 37, 38, 29 Aug. 2022
IEEE

A Design of L-probe Fed Miniaturized Patch Antenna for Earth Sensing Platform via LEO Satellite
Haruki Otomo, Takashi Hikage, Manabu Yamamoto, Kazumitsu Sakamoto, Yosuke Fujino, 2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), 104, 105, 29 Aug. 2022
IEEE

Estimation of Human Body Shadowing for Indoor Propagation in the 5G Frequency Band Using Parallel FDTD Analysis
Kazuki Yoshida, Takashi Hikage, Manebu Omiya, 2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), 116, 117, 29 Aug. 2022
IEEE

Using FEM Simulation to Estimation of Active Implantable Medical Device EMI Characteristic in the 4G and 5G Sub-6 Frequency Bands
Takuji Nishikawa, Takashi Hikage, Manabu Yamamoto, 2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), 124, 125, 29 Aug. 2022
IEEE

Identification of Candidate Genes Responsible for Flower Colour Intensity in Gentiana triflora
Keisuke Tasaki, Aiko Watanabe, Keiichirou Nemoto, Shigekazu Takahashi, Fumina Goto, Nobuhiro Sasaki, Takashi Hikage, Masahiro Nishihara, Frontiers in Plant Science, 13, 22 Jun. 2022
Gentians cultivated in Japan (Gentiana trifloraandGentiana scabraand hybrids) have blue flowers, but flower colour intensity differs among cultivars. The molecular mechanism underlying the variation in flower colour intensity is unclear. Here, we produced F2progeny derived from an F1cross of intense- and faint-blue lines and attempted to identify the genes responsible for flower colour intensity using RNA-sequencing analyses. Comparative analysis of flower colour intensity and transcriptome data revealed differentially expressed genes (DEGs), although known flavonoid biosynthesis-related genes showed similar expression patterns. From quantitative RT-PCR (qRT-PCR) analysis, we identified two and four genes with significantly different expression levels in the intense- and faint-blue flower lines, respectively. We conducted further analyses on one of the DEGs, termedGtMIF1, which encodes a putative mini zinc-finger protein homolog, which was most differently expressed in faint-blue individuals. Functional analysis ofGtMIF1was performed by producing stable tobacco transformants.GtMIF1-overexpressing tobacco plants showed reduced flower colour intensity compared with untransformed control plants. DNA-marker analysis also confirmed that theGtMIF1allele of the faint-blue flower line correlated well with faint flower colour in F2progeny. These results suggest thatGtMIF1is one of the key genes involved in determining the flower colour intensity of gentian., Frontiers Media SA

E/B mode decomposition of HSC-Y1 cosmic shear using COSEBIs: Cosmological constraints and comparison with other two-point statistics
Takashi Hamana, Chiaki Hikage, Masamune Oguri, Masato Shirasaki, Surhud More, Publications of the Astronomical Society of Japan, 74, 4, 923, 945, 17 Jun. 2022
Abstract
We perform a cosmic shear analysis of Hyper Suprime-Cam Subaru Strategic Program first-year data (HSC-Y1) using complete orthogonal sets of E/B-integrals (COSEBIs) to derive cosmological constraints. We compute E/B-mode COSEBIs from cosmic shear two-point correlation functions measured on an angular range of 4′ < θ < 180′. We perform a standard Bayesian likelihood analysis for cosmological inference from the measured E-mode COSEBIs, including contributions from intrinsic alignments of galaxies as well as systematic effects from point spread function model errors, shear calibration uncertainties, and source redshift distribution errors. We adopt a covariance matrix derived from realistic mock catalogs constructed from full-sky gravitational lensing simulations that fully take account of the survey geometry and measurement noise. For a flat Λ cold dark matter model, we find $S\,_8 \equiv \sigma _8\sqrt{\Omega _{\rm m}/0.3}=0.809_{-0.026}^{+0.036}$. We carefully check the robustness of the cosmological results against astrophysical modeling uncertainties and systematic uncertainties in measurements, and find that none of them has a significant impact on the cosmological constraints. We also find that the measured B-mode COSEBIs are consistent with zero. We examine, using mock HSC-Y1 data, the consistency of our S8 constraints with those derived from the other cosmic shear two-point statistics, the power spectrum analysis by Hikage et al. (2019, PASJ, 71, 43) and the two-point correlation function analysis by Hamana et al. (2020, PASJ, 72, 16), which adopt the same HSC-Y1 shape catalog, and find that all the S8 constraints are consistent with each other, although the expected correlations between derived S8 constraints are weak., Oxford University Press (OUP)

Evaluation of Cabin-to-Exterior Propagation Characteristics for Sub-6GHz/5G Using Small Aircraft Model
Sato, Ai, Hikage, Takashi, Omiya, Manabu, Futatsumori, Syunichi, Kohmura, Akiko, Yonemoto, Naruto, IEICE transactions on electronics, E105, 5, 149, 156, May 2022
航空機の機内及び機外における無線回線設計に資する伝搬特性推定法について，大規模FDTD解析の適用を検討している．本論文では，小型航空機モデルを用いた電磁界解析を実行し，5G Sub-6 GHz周波数帯における機内から機外電波高度計付近までの干渉経路損失特性について検討する．干渉経路損失特性モデルとして，FI (Floating intercept)モデルあるいはABG (Alpha beta gamma)モデルの利用を提案し，それら伝搬モデルのパラメータをシミュレーション結果から導出し，その有効性について議論した．, IEICE - Institute of the Electronics, Information and Communication Engineers, Japanese

Erratum: Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data
Takashi Hamana, Masato Shirasaki, Satoshi Miyazaki, Chiaki Hikage, Masamune Oguri, Surhud More, Robert Armstrong, Alexie Leauthaud, Rachel Mandelbaum, Hironao Miyatake, Atsushi J Nishizawa, Melanie Simet, Masahiro Takada, Hiroaki Aihara, James Bosch, Yutaka Komiyama, Robert Lupton, Hitoshi Murayama, Michael A Strauss, Masayuki Tanaka, Publications of the Astronomical Society of Japan, 74, 2, 488, 491, 24 Jan. 2022
Oxford University Press (OUP)

Propagation Loss Model with Human Body Shielding for High-Altitude Platform Station Communications
OMOTE Hideki, SATO Akihiro, KIMURA Sho, TANAKA Shoma, LIN HoYu, HIKAGE Takashi, IEICE Transactions on Communications (Web), E105.B, 10, 2022

Estimation of Electromagnetic Coupling Due to Lead on Pacemaker EMI in Cellular Frequency Band
西川拓次, 日景隆, 山本学, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022

A fundamental study on miniaturized patch antenna with L-probe feed and circular polarization
大友啓暉, 日景隆, 山本学, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022

Numerical Estimation of SAR Enhancement Due to Implanted Metal Plates Exposed to Circularly Polarized Wave
脇修平, 西川拓次, 日景隆, 長岡智明, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022

Fundamental study on quasi-millimeter wave band slot array antenna with double-sided feeding circuit
大野和輝, 日景隆, 山本学, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022

Estimation of Human Body Blockage Characteristics Considering Elevation Angle of Plane-wave for RF Dosimetry of Adolescent
杉村海渡, 山本康平, 日景隆, 山崎恵子, 宮下ちひろ, 田村菜穂美, 荒木敦子, 岸玲子, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022

Large-scale FDTD Analysis for Optimal Wireless Link Design of Local 5G in Real Indoor Propagation Environment
吉田総希, 日景隆, 山本学, 大宮学, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022

Development and Characteristics Estimation of 60GHz Band Lens Antenna for Investigation of Effects of Local Exposure to Millimeter-waves on Thermal Physiology and Cellular Functions
YAMAMOTO Kohei, SUGIMURA Kaito, HIKAGE Takashi, MASUDA Hiroshi, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022

有限要素法を用いた5G sub6周波数帯におけるダイポールアンテナ及びスロットアンテナ近傍での植込み型医療機器干渉誘起電圧推定
日景 隆, 電子情報通信学会技術研究報告, vol. 121, no. 358, 32, 37, 2022

RF Exposure Polarization Dependency of Active Implantable Medical Device EMI in 5G Sub-6 GHz Frequency Band
Takuji Nishikawa, Atsuki Ohtsuka, Takashi Hikage, Manabu Yamamoto, IEICE Proceeding Series, 68, P3-8, 59, 01 Dec. 2021, [Peer-reviewed]
The relationship between electromagnetic interference (EMI) characteristics of implantable medical devices and polarization of RF both under near- and far-fields exposure conditions is investigated using numerical simulation. As a numerical model, we prepare an implantable pacemaker embedded in a human phantom used in EMI evaluation tests and analyze the AIMD-EMI characteristics near the transmitter in the 5G Sub6 frequency band by conducting electromagnetic field simulations based on the finite element method., The Institute of Electronics, Information and Communication Engineers, English

Human Body Shielding Loss Model with Frequency Characteristics for HAPS Communication
Hoyu Lin, Hideki Omote, Shoma Tanaka, Takashi Hikage, Akihiro Sato, Sho Kimura, 2021 International Symposium on Antennas and Propagation (ISAP), 1, 2, 19 Oct. 2021
IEEE

Measurement of 4 GHz Radio Altimeter Interference Path Loss Including 5G Sub-6 Frequency Bands Using Beechcraft B300 Aircraft
Ryunosuke Ozaki, Norihiko Miyazaki, Toshio Nojima, Takashi Hikage, Shunichi Futatsumori, Ai Sato, 2021 International Symposium on Antennas and Propagation (ISAP), 1, 2, 19 Oct. 2021
IEEE

A Wideband Planar Array Antenna Using Both-Sided MIC and Leaf-Shaped Bowtie Slot Elements
Manabu Yamamoto, Takashi Hikage, Mangseang Hor, Naoya Yamamoto, 2021 International Symposium on Antennas and Propagation (ISAP), 1, 2, 19 Oct. 2021
IEEE

Linear Array of Leaf-Shaped Bowtie Slot Antenna Electromagnetically Fed by Microstrip Line
Mangseang Hor, Takashi Hikage, Manabu Yamamoto, 2021 International Symposium on Antennas and Propagation (ISAP), 1, 2, 19 Oct. 2021
IEEE

The protocol for the study about association between radio frequency wave and children's health: The Hokkaido study on environment and children's health
Chihiro Miyashita, Manabu Omiya, Takashi Hikage, Atsuko Araki, Reiko Kishi, Masahiro Mizuta, Naomi Tamura, Keiko Yamazaki, 2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 1, 2, 28 Aug. 2021
It is needed to clarify the association between radio frequency (RF) wave exposure and child health, especially focused on neurodevelopment. We conduct questionnaire survey on mobile phone usage and children's behavior and health status for all children in the existing Hokkaido study cohort (n = 12,000, 7–17 year-old). Additionally, we implement three types of face to face survey for neurodevelopment (cognitive assessment, electroencephalogram recording, and intelligence test), along with personal radio frequency wave exposure measurements by portable devices, on children participating the existing Hokkaido birth cohort study (n = 400, respectively). All together, we examine the association between radio frequency wave exposure and children's health, controlling for potential confounding factors. In the presentation, we introduce the protocol of our project., IEEE

Experimental Validation for Temperature Rise in Human Tissue Due to Implanted Metal Plates with Screw Holes Using Translucent Solid Phantom
Tomoaki Nagaoka, Soichi Watanabe, Kanako Wake, Suzune Ito, Atsuki Ohtsuka, Takashi Hikage, 2020 International Symposium on Antennas and Propagation (ISAP), 369, 370, 25 Jan. 2021
This paper introduced numerical estimations for SAR enhancement in human tissue due to metal plate implants with screw holes. To investigate the impact of the metal implants, we numerically evaluate SAR of human head phantom with complicated shaped metal implants. From the simulation results, SAR enhancement due to the implanted metallic plates was clearly observed at specific frequency. We also achieved temperature increase measurements using translucent solid phantoms in order to confirm validation of the numerical results., IEEE

A Study on Beam Narrowing and Gain Enhancement of Patch Array Antenna Using FSS
Tatsuro Shigihara, Manabu Yamamoto, Kento Yoshizawa, Kazumitsu Sakamoto, Takashi Hikage, 2020 International Symposium on Antennas and Propagation (ISAP), 811, 812, 25 Jan. 2021
This paper presents a study on beam narrowing and gain enhancement of a patch array antenna by loading Frequency Selective Surface (FSS) consisting of periodic arrangement of rectangular dipoles. The dipole element is designed so that its length get shorter towards the end of the antenna to equalize the phase distribution on the aperture surface. Antenna characteristics are evaluated by performing the finite-difference time domain (FDTD) analysis for the case when the main beam direction of the patch array antenna is the broadside and when the main beam direction is tilted from the broadside. From the simulated results, beam narrowing and gain enhancement are confirmed for the above-mentioned cases., IEEE

Leaf-Shaped Bowtie Slot Antenna Array for Application in Beam Scanning
Manabu Yamamoto, Mangseang Hor, Takashi Hikage, 2020 International Symposium on Antennas and Propagation (ISAP), 777, 778, 25 Jan. 2021
In this paper, a circular 4×4 Butler Matrix based on microstrip line is designed and applied to a 4-element linear array of leaf-shaped bowtie slot antenna. This antenna structure is designed to operate within 27GHz to 29GHz. The circular butler matrix is used in order to eliminate crossover element. On the top of antenna array, a dielectric superstrate with high dielectric constant is used to improve impedance bandwidth and gain. Those antenna characteristics are evaluated by using Finite Different Time Domain (FDTD) method. From the simulated results, −10dB impedance bandwidth is within 27GHz to 28.5GHz and the antenna can scan the beam within 9° to −13° along E-plane., IEEE

Human Shielding Loss Model Considering Frequency Characteristics in HAPS Communications
佐藤彰弘, 木村翔, LIN Hoyu, 田中翔馬, 表英毅, 日景崇, 電子情報通信学会大会講演論文集(CD-ROM), 2021, 2021

第5世代移動通信システムSub-6GHz周波数帯における植込み型心臓ペースメーカEMI推定を目的とした干渉誘起電圧測定
日景 隆, 電子情報通信学会光応用電磁界計測研究会技術研究報告, PEM2020-12, 17, 20, 2021

電界型及び磁界型アンテナ近傍における植込み型医療機器干渉誘起電圧推定
日景 隆, 電子情報通信学会技術研究報告, vol. 121, no. 32, 20, 26, 2021

5G Sub-6GHz 周波数帯における植込み型心臓ペースメーカ EMI 推定を目的とした電気 - 光変換による干渉誘起電圧測定
日景 隆, 2021年電子情報通信学会総合大会予稿集, -, 2021

(Invited) Numerical Estimation of Indoor Propagation Characteristics Considering Human-Body Blockage for a Beam-type Wireless Power Transfer
日景 隆, proc. of XXXIV General Assembly and Scientific Symposium (GASS) of the International Union of Radio Science, -, 2021, [Peer-reviewed]

スロットアンテナ近傍における植込み型医療機器干渉誘起電圧推定
日景 隆, 電子情報通信学会技術研究報告, vol. 121, no. 188, 40, 43, 2021

Active Implantable Medical Device EMI Estimation for EV-Charging WPT System Based on Measurement and 3D Numerical Analysis
日景 隆, proc. of 5th International Electric Vehicle Technology Conference, 20214356, 2021, [Peer-reviewed]

Numerical Estimation on Active Implantable Medical Device EMI Due to Near-field Exposure of Sub-6 GHz 5G Frequency band Using Finite Element Analysis
日景 隆, proc. of XXXIV General Assembly and Scientific Symposium (GASS) of the International Union of Radio Science, -, 2021, [Peer-reviewed]

FEMシミュレーションを用いた5G Sub6 周波数帯における植込み型ペースメーカEMI特性の検討
日景 隆, 信学技報, vol. 120, no. 328, 99, 102, 2021

EMF exposure evaluation method for underground mobile base stations
日景 隆, proc. of The BioEM2021, -, 2021, [Peer-reviewed]

Numerical Estimation of Indoor Propagation Characteristics Considering Shadowing due to Human Bodies in Local-5G Frequency Band
日景 隆, Proc. of 4th International Workshop on Photonics applied to Electromagnetic Measurements in Sapporo (PEM2021), -, 63, 65, 2021, [Peer-reviewed]

Interference Path Loss Measurements of Beechcraft B300 Aircraft at 4 GHz Wireless Avionics Intra-Communication Band
Takashi Hikage, Manabu Yamamoto, Shunichi Futatsumori, Nxorihiko Miyazaki, Tetsuya Sekiguchi, Toshio Nojima, 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, 1, 4, 23 Sep. 2020
Wireless Avionics Intra-Communication (WAIC) devices operate between 4,200 MHz and 4,400 MHz. This is the same frequency band as aircraft radio altimeters. In this paper, to investigate the coexistence conditions, the radio altimeter interference path loss (IPL) due to an assumed WAIC device is investigated. Firstly, an overview of the Beechcraft B300, a medium sized turboprop aircraft, is given. Then, the radio altimeter IPL measurement set-up is discussed. The measurement set-up and procedures are based on the RTCA DO-307A procedure. Finally, the IPL values are calculated using the measurement results. The minimum IPL value with the transmitting antenna inside of the cabin is 72.8 dB. This is not significantly small compared with that of the Airbus A321 (74.4 dB). In addition, the median IPL value with the transmitting antenna inside of the cabin is 90.9 dB., IEEE

Height and Angle Characteristics of Point Source Transmitting Power of Wireless Avionics Intra-Communication Systems Based on FDTD Analysis
Manabu Yamamoto, Shunichi Futatsumori, Kazuyuki Morioka, Takashi Hikage, Tetsuya Sekiguchi, Toshio Nojima, Applied Computational Electromagnetics Society, 35, 1274, 1275, 01 Jul. 2020
The equivalent isotopically radiated power (EIRP) of a wireless avionics intra-communication (WAIC) system is limited to 6 dBm/MHz at the geometrical center of the aircraft, to avoid interference with aircraft radio altimeters, which are operated at the same frequency band between 4,200–4,400 MHz. In this paper, the height and angle characteristics of the point source EIRP of a WAIC system are analyzed based on the large scale FDTD analysis. Firstly, the strength of the electric field (E-field) around the three-dimensional model of Airbus A320-200 is analyzed. Then, the point source EIRP is calculated based on the analyzed E-field strength. Finally, the height and angle characteristics are analyzed to estimate the electromagnetic field characteristics of the aircraft., River Publishers

電波と生体安全性-基本的考え方から実際の評価まで-
日景 隆, 第26回EMC環境フォーラム，技術セッション9「電波と生体安全性」, -, 1, 4, 2020

有限要素法を用いたスロットアンテナ近傍における植込み型医療機器EMI特性の検討
日景 隆, 信学技報, vol. 120, no. 175, 11, 14, 2020

ペースメーカ等医療機器とEMCの話題
日景 隆, IoT時代のシステムとEMC調査専門委員会, -, 1, 4, 2020

3D-FEMシミュレーションを用いた4G/LTE周波数帯植込み型医療機器EMI評価法の検討
日景 隆, 信学技報, vol. 120, no. 83, 29, 32, 2020

Metamaterial-Inspired Quad-Band Notch Filter for LTE Band Receivers and WPT Applications
日景 隆, proc. of XXXIV General Assembly and Scientific Symposium (GASS) of the International Union of Radio Science, -, 1, 4, 2020, [Peer-reviewed], ［Internationally co-authored］

RF-WPT周波数帯における植込み型心臓ペースメーカEMI推定を目的とした電気-光変換による干渉誘起電圧測定
日景 隆, 信学技報, vol. 120, no. 171, 79, 80, 2020

Development of Novel 70 GHz Band Exposure Equipment System for Studies on Thermal Perception Thresholds of Biological Effects Exposed to Millimeter-Wave
Hiroshi Masuda, Takashi Hikage, Itsuki Kageyama, Keita Sakakibara, 2019 IEEE Conference on Antenna Measurements & Applications (CAMA), 195, 198, 01 Oct. 2019
A novel radio-wave exposure equipment system is developed for studies on thermal perception thresholds of biological effects exposed to millimeter-wave at 70 GHz band that is one of 5th generation wireless systems (5G) candidate frequency band. To achieve high duty RF exposure on living body at 70 GHz required, we newly designed a lens antenna that can irradiate focused beam. In order to obtain basic exposure performance of the developed equipment, we used physical phantom that simulated human's skin and achieved experimental measurements of temperature rise during at 70 GHz band millimeter-wave exposure. After 60 seconds exposure, the temperature on expected area of the phantom surface increased 0.6 degree Celsius. In summary, developed equipment can achieve required high exposure on the sample., IEEE

Comparison of Temperature Elevation between in Physical Phantom Skin and in Human Skin During Local Exposure to a 28 GHz Millimeter-Wave
Itsuki Kageyama, Takashi Hikage, Keita Sakakibara, Akimasa Hirata, Yoshitaka Morimatsu, Tatsuya Ishitake, Hiroshi Masuda, IEICE Proceeding Series, 58, 766, 769, 01 Jun. 2019
A millimeter-wave (MMW) at 28 GHz band, a candidate frequency for 5th generation wireless systems (5G), causes some concern about possible adverse effects on the human body. To investigate biological effects of local exposure to MMW, exposure systems equipped with a newly lens antenna, that can irradiate focused beam, were developed and characteristics of exposure for the skin were evaluated. The basic exposure performance of the systems was evaluated using temperature monitoring in physical phantom simulated human?fs skin and actual skin of forearm. Local temperature elevations were observed in both exposed skins, meaning achievement of results we expected in dosimetry. However, the time courses of these elevations were significantly different. These results suggest that some elements related to the temperature control such as heat conductivity and cooling by skin blood flow should be considered., The Institute of Electronics, Information and Communication Engineers, English

Investigation on Heating of the Implant Metal Exposed to HF-EMF due to Wireless Power Transfer
Toshio Nojima, Shinto Son, Emi Matsuda, Takashi Hikage, 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 1, 1, 01 Mar. 2019
With regard to the electromagnetic field (EMF) emitted from wireless communication devices, international radio radiation protection guidelines for human exposure to EMF have been established by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) [1] and the Institute of Electrical and Electronic Engineers (IEEE) [2]. These guidelines provide no quantitative discussions about their relevance to humans with metallic objects embedded in their bodies. It is very important to estimate the amount of exposure that users with metallic implants will experience. Some papers regarding interaction of radio frequency (RF) EMF and metallic implants have been published, and studies on the EMF exposure of users with passive metallic implants have reported measurements and numerical estimations [3], [4]., IEEE

航空機内データ通信における国際標準化動向および電磁環境評価
二ッ森俊一, 森岡和行, 河村暁子, 米本成人, 日景隆, 関口徹也, 野島俊雄, 電子航法研究所研究発表会講演概要, 19th, 2019

垂直面電波到来角を考慮した人体遮蔽測定
佐藤彰弘, 緒方大悟, 木村翔, 表英毅, 日景隆, 電子情報通信学会大会講演論文集(CD-ROM), 2019, 2019

Numerical Estimation of Indoor Propagation Characteristics Considering Human-Body Shadowing for Beam-type Wireless Power Transfer
日景 隆, proc. of 2019 Asian Wireless Power Transfer Workshop(AWPT2019), -, 1, 2, 2019, [Peer-reviewed]

Experimental Estimation on SAR Enhancement Due to Implanted Metal Plates Using Novel Translucent Semi-Solid Phantom
日景 隆, proc. of EMC Sapporo & APEMC 2019, -, 765, 2019, [Peer-reviewed]

電気光変換器を用いたビーム型WPT周波数帯電波ばく露における植込み型心臓ペースメーカEMI評価のための干渉誘起電圧測定系
日景 隆, 電子情報通信学会技術研究報告, vol.119, no.135, WPT2019-26, 23, 28, 2019

Experimental estimation on temperature rise in human tissue due to implanted metal plates using novel translucent semi-solid phantom
日景 隆, proc. of The Joint Annual Meeting of The Bioelectromagnetics Society and the European BioElectromagnetics Association, -, 394, 396, 2019, [Peer-reviewed]

Estimation of Specific Absorption Rate Enhancement Due to Metallic Plate Implants with Screw Holes at Mobile Radio Frequency Bands
日景 隆, proc. of The Philippines-Japan Workshop on Wireless, Radio and Antenna Technologies, -, 1, 2, 2019, [Peer-reviewed]

Estimation on RF Penetration Characteristics into Saline Solution at 28 GHz Using Finite Element Method
日景 隆, proc. of The 2nd Indonesia-Japan Workshop on Antennas and Wireless Technology, -, 38, 2019, [Peer-reviewed]

モバイル機器を対象とするワイヤレス電力伝送装置による植込み型心臓ペースメーカ/ICD への電磁干渉影響に関する調査事例
日景 隆, 電子情報通信学会技術研究報告, vol. 119, no. 74, WPT2019-11, 7, 10, 2019

Numerical Estimation on RF Penetration Characteristics into Saline Solution at 5G Frequency Bands for AIMD-EMI Assessments
日景 隆, proc. of The Philippines-Japan Workshop on Wireless, Radio and Antenna Technologies, -, 2019, [Peer-reviewed]

人体遮蔽を考慮したマイクロ波帯無線電力伝送装置の屋内伝搬特性推定
日景 隆, 電子情報通信学会技術研究報告, vol. 119, no. 74, WPT2019-12, 11, 14, 2019

FDTD-Based Numerical Estimation of Human Body Blockage Characteristics in 26GHz Band Indoor Propagation
Motoharu Sasaki, Yasushi Takatori, Masakazu Yamagishi, Takashi Hikage, Mitsuki Nakamura, 2018 48th European Microwave Conference (EuMC), 878, 881, 01 Sep. 2018
The aim of this study is to develop an accurate and reliable method of estimating propagation channels and propagation modelling so as to advance radio link design of fifth generation (5G) wireless systems. It was reported that in the high frequency bands used for 5G, shadow fading is large as is the loss due to human bodies. This paper elucidates the effects of human body blockage on 26 GHz-band propagation characteristics in an indoor environment. A novel method for estimating human body blockage characteristics based on large scale FDTD analysis is proposed. Electromagnetic field distributions inside an office environment created by a 26 GHz wireless transmitter are analysed and propagation characteristics are discussed., IEEE

Estimation of SAR Enhancement Due to Implant Metal Exposed to External Electromagnetic Waves
Emi Matsuda, Keita Sakakibara, Manabu Yamamoto, Toshio Nojima, Takashi Hikage, 2018 IEEE International Workshop on Electromagnetics:Applications and Student Innovation Competition (iWEM), 1, 1, 01 Aug. 2018
The RF exposure guidelines do recognize that an increased local SAR (Specific Absorption Rate) due to metallic implants is possible. In this study, the effect of implantable medical device in human torso region is examined. A simple flat torso phantom is used which a cardiac pacemaker model is implanted in. The local SAR dependencies due to exposure frequency bands were presented. Here, we estimate localized SAR at several candidate frequency bands for 5th generation wireless systems., IEEE

A Large Scale FDTD Analysis of Propagation Characteristics for Wireless Link Design of 4.4 GHz-Band WAIC Installed on Passenger Aircraft
S. Futatsumori, Akiko Kohmura, Takashi Hikage, Tetsuya Sekiguchi, Naruto Yonemoto, 2018 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 153, 154, 01 Jul. 2018
Aim of this study is to develop an accurate and reliable method for estimating propagation characteristics inside and outside aircraft cabin so as to advance wireless link design for Wireless Avionics Intra-Communication (WAIC) system. This paper estimates propagation characteristics from inside cabin to exterior mounted antenna of WAIC system installed on a passenger aircraft (Airbus 320–200 model). EMF distributions excited by a 4.4 GHz wireless transmitter inside cabin are analyzed and fundamental characteristics for the WAIC system are derived from the analysis results., IEEE

Erratum to: Multiwavelength study of X-ray luminous clusters in the Hyper Suprime-Cam Subaru Strategic Program S16A field
Rachel Mandelbaum, Yen-Ting Lin, Masayuki Tanaka, Yutaka Komiyama, Hironao Miyatake, Yousuke Utsumi, Ikuyuki Mitsuishi, Masamune Oguri, Kousuke Sato, Yasunori Babazaki, Keiichi Umetsu, Elinor Medezinski, Yasushi Fukazawa, Atsushi J. Nishizawa, Toru Sasaki, Surhud More, Nobuhiro Okabe, Hiroki Akamatsu, Yutaka Fujita, David N. Spergel, Takao Kitaguchi, I. Non Chiu, Takashi Hamana, Naomi Ota, Kazuhiro Nakazawa, Alexie Leauthaud, Jean Coupon, Yuto Ichinohe, Satoshi Miyazaki, Manobu M. Tanaka, Takayuki Tamura, Akio Hoshino, Chiaki Hikage, Keita Miyaoka, Shutaro Ueda, Kyoko Matsushita, Motokazu Takizawa, Publications of the Astronomical Society of Japan, 70, SP1, S22, 12 Mar. 2018
Abstract
We present a joint X-ray, optical, and weak-lensing analysis for X-ray luminous galaxy clusters selected from the MCXC (Meta-Catalog of X-Ray Detected Clusters of Galaxies) cluster catalog in the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) survey field with S16A data. As a pilot study for a series of papers, we measure hydrostatic equilibrium (HE) masses using XMM-Newton data for four clusters in the current coverage area out of a sample of 22 MCXC clusters. We additionally analyze a non-MCXC cluster associated with one MCXC cluster. We show that HE masses for the MCXC clusters are correlated with cluster richness from the CAMIRA catalog, while that for the non-MCXC cluster deviates from the scaling relation. The mass normalization of the relationship between cluster richness and HE mass is compatible with one inferred by matching CAMIRA cluster abundance with a theoretical halo mass function. The mean gas mass fraction based on HE masses for the MCXC clusters is 〈fgas〉 = 0.125 ± 0.012 at spherical overdensity Δ = 500, which is ∼80%–90% of the cosmic mean baryon fraction, Ωb/Ωm, measured by cosmic microwave background experiments. We find that the mean baryon fraction estimated from X-ray and HSC-SSP optical data is comparable to Ωb/Ωm. A weak-lensing shear catalog of background galaxies, combined with photometric redshifts, is currently available only for three clusters in our sample. Hydrostatic equilibrium masses roughly agree with weak-lensing masses, albeit with large uncertainty. This study demonstrates that further multiwavelength study for a large sample of clusters using X-ray, HSC-SSP optical, and weak-lensing data will enable us to understand cluster physics and utilize cluster-based cosmology., Oxford University Press (OUP)

積雪中に埋もれた人体に装着した携帯端末の電波伝搬特性
表英毅, 藤井輝也, 日景隆, 電子情報通信学会大会講演論文集(CD-ROM), 2018, 2018

Microwave electromagnetic field characteristic evaluations in aircrafts containing lossy materials based on quality factor of a reverberation chamber
Takashi Hikage, Shunichi Futatsumori, 2017 International Symposium on Antennas and Propagation (ISAP), 1, 2, 01 Oct. 2017
The effects of electromagnetic lossy materials such as humans, on the electromagnetic field (EMF) characteristics of an aircraft are evaluated using finite-difference time-domain analyses and experiments conducted in a reverberation chamber. This study aims to confirm the EMF reduction effect, through measurements. The results of a large-scale finite-difference time-domain analysis conducted on a model of the B777-200 aircraft with occupants show a reduction in the electric field strength inside the cabin. The EMF loss due to a human phantom is measured quantitatively using a reverberation chamber, between 500 MHz and 6 GHz. The measured quality factor is found to be reduced by 55% when using a full-sized human phantom, which is lower than of the value measured at 2.1 GHz, without using a phantom., IEEE

Aircraft electromagnetic field estimation for wireless avionics intra-communication band using large-scale FDTD analysis — Field estimation of A320 class passenger aircraft at 4 GHz band
Shunichi Futatsumori, Kazuyuki Morioka, Akiko Kohmura, Naruto Yonemoto, Takashi Hikage, Kanji Yahagi, Masami Shirafune, Manabu Yamamoto, Toshio Nojima, Shoichi Narahashi, 2017 International Applied Computational Electromagnetics Society Symposium - Italy (ACES), 1, 2, Mar. 2017
Electromagnetic compatibly (EMC) is required to be investigated for newly introduced on-board Wireless Avionics Intra-Communication (WAIC) systems. In this paper, the feasibility of the detailed electromagnetic field (EMF) estimation method for the Airbus A320 class passenger aircraft at 4 GHz band is discussed. Firstly, the three-dimensional analysis model based on Airbus A320-200 aircraft is developed for the EMF estimation using the large-scale finite-difference time-domain (FDTD) method. Then, the material constants and the FDTD analysis parameters are discussed. Finally, the analyzed EMF characteristics confirm the effectiveness of the EMC investigation at WAIC band using the numerical analysis., IEEE

Statistical analysis method of radio propagation path loss for gas-smart meters in a built-up area based on large-scale FDTD simulation
Takashi Hikage, Takuya Kawata, Kazuki Shindo, Toshio Nojima, Sota Tsuchiya, Masami Shirafune, Shoichi Narahashi, 2017 IEEE International Conference on Computational Electromagnetics (ICCEM), 254, 256, 01 Mar. 2017
This paper presents a large-scale Finite-Difference Time-Domain (FDTD) simulation as a prediction method for radio propagation characteristics for multi-hop communication of gas-smart meters in a built-up area. The frequency bands used in the simulations is 920 MHz-bands. By using the FDTD method to obtain precise and comprehensive results in multi-reflective environment, wave propagation from the gas-smart meters are observed and path loss characteristics are estimated statistically. Obtained larger path loss for the gas-smart meter in the built-up area compared with other propagation model, such as cellular communication, was more noticeable, and it is important for these effects need to be considered in the wireless link planning., IEEE

3D Numerical Simulations of Implantable Cardiac Pacemaker EMI Triggered by Electric Vehicle Charging Wireless Power Transfer System
日景 隆, proc. of PIERS 2017, -, 1578, 2017, [Peer-reviewed]

Numerical Simulations of Implantable Cardiac Pacemaker EMI Triggered by 85 kHz-band Wireless Power Transfer System
日景 隆, Wireless Power Transfer Workshop (AWPT 2017), -, 1, 2017, [Peer-reviewed]

Numerical estimation of frequency characteristics of interference voltage in cellular band for active implantable medical device EMI assessment
日景 隆, proc. of BioEM 2017, -, 334, 337, 2017, [Peer-reviewed]

IN VITRO ASSESSMENT OF IMPLANTABLE CARDIAC PACEMAKER EMI TRIGGERED BY INTERMITTENT SIGNAL OF WIRELESS POWER TRANSFER SYSTEM IN STANDBY MODE
日景 隆, proc. of XXXIInd International Union of Radio Science General Assembly and Scientific Symposium, -, 1, 1, 2017, [Peer-reviewed]

Numerical Estimation of Propagation Path Loss for Smart Gas Meters in Built-up Areas Based on Large-Scale FDTD Simulation
日景 隆, proc. of 2017 IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting, -, 1, 1, 2017, [Peer-reviewed]

Numerical Estimation of Radio Propagation Characteristics for 26GHz Band Communication System using Large Scale FDTD Analysis and 3D Laser Scanner
日景 隆, proc. of 2017 Asian Workshop on Antennas and Propagation, -, 96, 2017, [Peer-reviewed]

Active Implantable Medical Device EMI Estimation for EV-Charging WPT System Based on 3D Full-wave Analysis
日景 隆, proc. of 2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, -, 87, 89, 2017, [Peer-reviewed]
A numerical assessment methodology of active implantable pacemaker EMI triggered by wireless power transfer system for electric vehicle charging is presented. A numerical model that consists of electric vehicle wireless power transfer system and a human phantom is developed and used in the simulation. The interference voltages induced at the implantable pacemaker model are obtained using three dimensional full-wave numerical simulations based upon the finite element method. We assume realistic exposure scenarios, when the orientation and location of the human are varied, in order to develop conservative estimates of the interference voltage., IEEE

Numerical estimation of SAR enhancement due to implantable vision prosthesis featuring wireless power transfer coil in human head under near- and far-fields exposure conditions
日景 隆, proc. of BioEM 2017, -, 522, 523, 2017, [Peer-reviewed]

Large-Scale FDTD Analysis of 4.4 GHz-band Propagation Characteristics in Aircraft Cabin
Kanji Yahagi, Masami Shirafune, Takashi Hikage, Manabu Yamamoto, Toshio Nojima, Shoichi Narahashi, Syunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto, IEICE Proceeding Series, 38, 566, 567, 24 Oct. 2016
Electromagnetic field (EMF) distributions generated by a 4.4 GHz-band wireless transmitter used in Wireless Avionics Intra Communications (WAIC) technology inside an aircraft cabin are analyzed and fundamental propagation characteristics are discussed fro, The Institute of Electronics, Information and Communication Engineers, English

FEM Simulation of Induced Interference Voltage at Implantable Cardiac Pacemaker Due to Wireless Power Transfer in HF-band
Naoki Tanaka, Takashi Hikage, Juan Corcoles, Toshio Nojima, IEICE Proceeding Series, 38, 916, 917, 24 Oct. 2016, [Peer-reviewed]
A novel numerical Wireless Power Transfer (WPT)/Active Implantable Medical Device-EMI estimation methodology based upon finite element method analysis is presented. This assessment methodology can be applied to both Mobile/Portable-WPT system and electric, The Institute of Electronics, Information and Communication Engineers, English

B-1-39 A Large-Scale Numerical Analysis of In-car Propagation Characteristics and RF Leakage to Oncoming Car of Wireless LAN in a Train Considering Loss due to Passengers' RF absorption
SHIRAFUNE Masami, HIKAGE Takashi, YAMAMOTO Manabu, NOJIMA Toshio, INOMATA Minoru, SASAKI Motoharu, YAMADA Wataru, ONIZAWA Takeshi, Proceedings of the IEICE General Conference, 2016, 1, 39, 01 Mar. 2016
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-7 Measurement of Interference Voltage in Cellular Band Using an Electro-Optic Converter for Active Implantable Medical Device EMI assessment
TANAKA Naoki, HIKAGE Takashi, NOJIMA Toshio, IYAMA Takahiro, ONISHI Teruo, Proceedings of the IEICE General Conference, 2016, 1, 327, 01 Mar. 2016
The Institute of Electronics, Information and Communication Engineers, Japanese

Assessment of Electromagnetic Interference Due to Wireless Power Transfer for Electric Vehicle on Active Implantable Medical Devices
日景 隆, proc. of EVTeC & APE Japan 2016, -, 1, 5, 2016, [Peer-reviewed]

Active implantable medical device EMI estimation for EV-WPT system based on 3D full-wave analysis
日景 隆, proc. of 2016 Asian Wireless Power Transfer Workshop, -, 2016, [Peer-reviewed]

Novel measurement of interference voltage in cellular band using an electro-optic converter for active implantable medical device EMI assessment
日景 隆, proc. of BioEM 2016, -, 357, 360, 2016, [Peer-reviewed]

LF帯ワイヤレス電力伝送コイル近傍の植込み型心臓ペースメーカ干渉誘起電圧推定
日景 隆, 電子情報通信学会技術研究報告, WPT2015-74, 11, 16, 2016

電気光変換器を用いた携帯電話周波数帯電波ばく露における植込み型心臓ペースメーカEMI評価のための干渉誘起電圧測定系
日景 隆, 電子情報通信学会技術研究報告, vol. 116, no. 218,, 43, 46, 2016

Allelic variants of the esterase gene W14/15 differentially regulate overwinter survival in perennial gentian (Gentiana L.)
Noriko Yamagishi, Yui Takahashi, Ken-ichi Tsutsumi, Takashi Hikage, Yasushi Saitoh, Nobuyuki Yoshikawa, Molecular Genetics and Genomics, 291, 989, 997, 23 Dec. 2015
Overwinter survival has to be under critical regulation in the lifecycle of herbaceous perennial plants. Gentians (Gentiana L.) maintain their perennial life style through producing dormant and freezing-tolerant overwinter buds (OWBs) to overcome cold winter. However, the mechanism acting on such an overwinter survival and the genes/proteins contributing to it have been poorly understood. Previously, we identified an OWB-enriched protein W14/15, a member of a group of α/β hydrolase fold superfamily that is implicated in regulation of hormonal action in plants. The W14/15 gene has more than ten variant types in Gentiana species. However, roles of the W14/15 gene in OWB survival and functional difference among those variants have been unclear. In the present study, we examined whether the W14/15 gene variants are involved in the mechanism acting on overwinter survival, by crossing experiments using cultivars carrying different W14/15 variant alleles and virus-induced gene silencing experiments. We found that particular types of the W14/15 variants (W15a types) contributed toward obtaining high ability of overwinter survival, while other types (W14b types) did not, or even interfered with the former type gene. This study demonstrates two findings; first, contribution of esterase genes to winter hardiness, and second, paired set or paired partner among the allelic variants determines the ability of overwinter survival., Springer Science and Business Media LLC

Estimation of RF Leakage to Oncoming Train Cars From Wireless Access Point Operating in Bullet Train Passing Through a Tunnel
Masami Shirafune, Takashi Hikage, Manabu Yamamoto, Toshio Nojima, Minoru Inomata, Motoharu Sasaki, Wataru Yamada, Takeshi Onizawa, IEICE Proceeding Series, 37, S3.8.6, 09 Nov. 2015
The aim of this study is to develop an accurate and reliable method of estimating field distributions in train cars so as to advance radio link design of wireless LANs operated inside the cars. This paper describes effects of absorption and shielding caused by a large number of passengers on propagation characteristics of RF leakage from wireless access point operating in a bullet train. Field distributions created by a 2.4 GHz-band wireless transmitter inside cars, when oncoming train cars are passing through a double track railway tunnel, are analyzed and propagation characteristics are determined from the analysis results, The Institute of Electronics, Information and Communication Engineers, English

B-20-3 Experimental Estimation for SAR Enhancement Due to Implanted metal Plates for Mandibular fracture
TANAKA Naoki, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi, Proceedings of the Society Conference of IEICE, 2015, 1, 413, 25 Aug. 2015
The Institute of Electronics, Information and Communication Engineers, Japanese

BCS-1-1 An assessment for biological RF exposure safety in metallic enclosed environments : Numerical Estimation of EMI Impact by Mobile Radio on Implantable Cardiac Pacemakers in Elevator
HIKAGE Takashi, NOJIMA Toshio, Proceedings of the Society Conference of IEICE, 2015, 1, "S, 66"-"S-67", 25 Aug. 2015
The Institute of Electronics, Information and Communication Engineers, Japanese

The Subaru FMOS galaxy redshift survey (FastSound). I. Overview of the survey targeting Hα emitters at z ∼ 1.4
Motonari Tonegawa, Tomonori Totani, Hiroyuki Okada, Masayuki Akiyama, Gavin Dalton, Karl Glazebrook, Fumihide Iwamuro, Toshinori Maihara, Kouji Ohta, Ikkoh Shimizu, Naruhisa Takato, Naoyuki Tamura, Kiyoto Yabe, Andrew J. Bunker, Jean Coupon, Pedro G. Ferreira, Carlos S. Frenk, Tomotsugu Goto, Chiaki Hikage, Takashi Ishikawa, Takahiko Matsubara, Surhud More, Teppei Okumura, Will J. Percival, Lee R. Spitler, Istvan Szapudi, Publications of the Astronomical Society of Japan, 67, 5, 81, 23 Jun. 2015
Abstract
FastSound is a galaxy redshift survey that uses the near-infrared Fiber Multi-Object Spectrograph (FMOS) mounted on the Subaru Telescope, targeting Hα emitters at z ∼ 1.18–1.54 down to the sensitivity limit of Hα flux ∼ 2 × 10−16 erg cm−2 s−1. The primary goal of the survey is to detect redshift space distortion (RSD), to test the general theory of relativity by measuring the growth rate of large-scale structure and to constrain modified gravity models for the origin of the accelerated expansion of the universe. The target galaxies were selected based on photometric redshifts and Hα flux estimates calculated by fitting spectral energy distribution (SED) models to the five optical magnitudes of the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) Wide catalog. The survey started in 2012 March, and all the observations were completed in 2014 July. In total, we achieved 121 pointings of FMOS (each pointing has a 30′ diameter circular footprint) covering 20.6 deg2 by tiling the four fields of the CFHTLS Wide in a hexagonal pattern. Emission lines were detected from ∼ 4000 star-forming galaxies by an automatic line detection algorithm applied to 2D spectral images. This is the first in a series of papers based on FastSound data, and we describe the details of the survey design, target selection, observations, data reduction, and emission line detections., Oxford University Press (OUP)

An experimental estimation for SAR enhancement due to implanted metal plates using thermographic method
Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe, Takashi Hikage, Naoki Tanaka, 2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), 1, 1, 01 May 2015
RF exposure guidelines[1–3] recognize that an increase in local SAR due to metallic implants is possible, depending upon the size and shape of the implant and the position. Some papers regarding interaction of radio frequency (RF) EMF and passive metallic implants have been published [4–5]. This study describes the local SAR calculations for human with metallic osteosynthesis plates embedded in the mandibular zone exposed to RF fields. The main objective is to assess whether combination of two metallic plates aligned in parallel in the head region could be expected to cause SAR enhancements under near-field exposure condition at 2 GHz[6]. In this paper, we achieve temperature distribution measurements for a phantom implanted with osteosynthesis plates. A physical phantom implanted with two metallic plates is developed and thermographic method are used to obtain temperature distribution. The solid phantom was manufactured using silicone rubber and carbon material. The obtained measurement data can be used for validation study for further SAR estimations using numerical analysis. After 10 seconds RF exposure, when the antenna input power was set to be 500 W, the temperature distribution was measured immediately in front of the plate of the phantom. Figure 1 shows example of surface temperature distributions of the phantom. In the temperature distributions, temperature increase due to the metallic plates was clearly observed near the plate region. In addition, the measured result agreed well with numerical simulation result obtained using a commercially available FDTD simulation software[7]. Local SARs for a human model with osteosynthesis plates in the head region were also evaluated. By using an anatomical phantom implanted with metallic plates at the median mandibular, the effect of combination of two metallic implants, were estimated under near-field exposure condition at 2 GHz. The results indicated that the increase rate was 34% under the condition., IEEE

Murine double minute 2 predicts response of advanced esophageal squamous cell carcinoma to definitive chemoradiotherapy
Hiroshi Okamoto, Fumiyoshi Fujishima, Takashi Kamei, Yasuhiro Nakamura, Yohei Ozawa, Go Miyata, Toru Nakano, Kazunori Katsura, Shigeo Abe, Yusuke Taniyama, Tadashi Sakurai, Jin Teshima, Makoto Hikage, Hironobu Sasano, Noriaki Ohuchi, BMC Cancer, 15, 1, 208, 31 Mar. 2015
Definitive chemoradiotherapy (dCRT) has recently become one of the most effective therapies for the treatment of esophageal squamous cell carcinoma (ESCC). However, it is also true this treatment has not been effective in all patients. Therefore, it is very important to evaluate the surrogate marker of dCRT in order to improve clinical outcomes of patients with ESCC. On the other hand, our previous study had suggested that murine double minute 2 (MDM2) and p16 were associated with chemoradioresistance in ESCC.We selected pretreatment biopsy specimens of ESCC patients from our prospective clinical study on dCRT. Seventy-nine cases histologically diagnosed as ESCC were used. We immunohistochemically investigated these specimens using antibodies against MDM2, p53, p16, and Ki-67.The patients included 68 males and 11 females with a mean age of 63.3 years. The number of patients in each clinical stage was as follows: 22 in c-Stage I; 17 in c-Stage II; and 40 in c-Stage III. cT, cN, and cStage were significantly more advanced in the Failure group (including patients with persistent and recurrent disease after dCRT) than in the complete response (CR) group (patients with persistent CR after dCRT). The clinical stage inversely correlated with the CR rate and the rescue rate after failure. The overall survival rate was significantly worse in the patients with advanced cT, cN, and cStage levels, and in the Failure group. MDM2 positivity was significantly higher in the Failure group than in the CR group in cStageIII (P = 0.014). The number of patients with an absence of p16 immunoreactivity was significantly higher in the Failure group than in the CR group in cStageIII (P = 0.010) but not in cStageI or cStageII. Moreover, the overall survival with a Ki-67 ≥ 33.7% was significantly better than that with33.7% for patients in cStageIII (P = 0.024).The results of this study suggested that MDM2 and p16 are predictive markers for chemoradioresistance in cStageIII ESCC and Ki-67 is a prognostic marker following dCRT in cStageIII ESCC. These issues could contribute to the formulation of treatment strategy for patients with advanced ESCC., Springer Science and Business Media LLC

B-4-22 Measurement Set-up Using an Electro-Optic Converter for Interference Voltage of Active Implantable Medical Devices EMI Assessment
HIKAGE Takashi, ONO Taisuke, NOJIMA Toshio, IYAMA Takahiro, HIGASHIYAMA Junji, ONISHI Teruo, Proceedings of the IEICE General Conference, 2015, 1, 312, 24 Feb. 2015
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-162 Estimation of RF Leakage to Oncoming Train Cars from Wireless Access Point Operating in High-Speed Train Passing Through a Tunnel
SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, SASAKI Motoharu, YAMADA Wataru, SUGIYAMA Takatoshi, Proceedings of the IEICE General Conference, 2015, 1, 162, 24 Feb. 2015
The Institute of Electronics, Information and Communication Engineers, Japanese

B-20-7 Experimental Estimation for SAR Enhancement Due to Implanted metal Plates Using Thermographic Method
ONO Taisuke, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi, Proceedings of the IEICE General Conference, 2015, 1, 592, 24 Feb. 2015
The Institute of Electronics, Information and Communication Engineers, Japanese

Experimental Estimation of SAR Enhancement Due to Two Parallel Implanted Metal Plates Using a Head Phantom and Thermograph
Tomoaki Nagaoka, Naoki Tanaka, Takashi Hikage, Toshio Nojima, Soichi Watanabe, Proceedings of the 5th EAI International Conference on Wireless Mobile Communication and Healthcare - "Transforming healthcare through innovations in mobile and wireless technologies", 01 Jan. 2015
The main objective of this study is to assess whether two parallel metal plates implanted in the head region could be expected to cause SAR enhancements under UHF near-field exposure. In this paper, we achieve precise temperature distribution measurements for a physical head phantom implanted with two metallic plates using thermograph. The phantom was newly manufactured using silicone rubber and carbon material. In the measured distributions, temperature increase due to the metallic plates was clearly observed in the gap of two metal plates region. Obtained measurement data can be used for validation study for further SAR estimations using numerical analysis., ICST

In-vitro Assessment of Electromagnetic Interference caused by Wireless Power Transfer System on Active Implantable Medical Devices
日景 隆, proc. of 2015 Korea-Japan Joint Conference on EMT/EMC/BE, -, 45, 48, 2015, [Peer-reviewed]

HF帯ワイヤレス電力伝送コイル近傍の植込み型心臓ペースメーカ干渉誘起電圧推定
日景 隆, 電子情報通信学会技術研究報告, vol. 115, no. 289, 83, 86, 2015

Novel measurement set-up using an electro-optic converter for interference voltage of active implantable medical devices EMI assessment
日景 隆, proc. of the annual joint meeting of the Bioelectromagnetics Society (BEMS) and the European BioElectromagnetics Association, -, 441, 443, 2015, [Peer-reviewed]

EV充電用ワイヤレス電力伝送装置による植込み型医療機器EMIの実験的評価
日景 隆, 電子情報通信学会技術研究報告, vol. 115, no. 82, 49, 52, 2015

電気光変換器を用いた植込み型医療機器EMI評価のための干渉誘起電圧測定系構築
日景 隆, 電子情報通信学会光応用電磁界計測研究会技術研究報告, PEM2015-5, 1, 4, 2015

Novel Interference Voltage Sensor Using an Electro-Optic Converter for Active Implantable Medical Devices EMI Assessment
日景 隆, proc. of First PEM International Workshop in Kyoto, -, 1, 2, 2015, [Peer-reviewed]

Propagation Characteristic Estimations of 2 GHz Inter-Car Wireless Links in High-Speed Train Cars in a Railway Tunnel
Masami Shirafune, Takashi Hikage, Toshio Nojima, Motoharu Sasaki, Wataru Yamada, Takatoshi Sugiyama, IEICE Proceeding Series, 36, 1, TH1C_04, 216, 02 Dec. 2014
The aim of this study is to develop an accurate and reliable method to estimate field distributions in train cars so as to advance radio link design of wireless LANs operating inside the cars. This paper describes effects of reflected waves due to tunnel wall and/or train passing on opposite track on propagation characteristics inside the high-speed train cars in a typical railway tunnel. Field distributions created by a 2.4 GHz-band wireless transmitter inside cars are analyzed and exemplary propagation characteristics are determined statistically from large-scale numerical analysis results., The Institute of Electronics, Information and Communication Engineers, English

Evaluation of effects on electromagnetic field characteristics inside aircraft due to phenol internal structures using a reverberation chamber
Toshio Nojima, Akiko Kohmura, Naruto Yonemoto, Kazuyuki Morioka, Takashi Hikage, Shunichi Futatsumori, Masami Shirafune, 2014 International Symposium on Electromagnetic Compatibility, 313, 317, 01 Sep. 2014
Effects on electromagnetic field (EMF) characteristics inside aircraft due to internal structures, such as phenol internal walls are experimentally investigated using a reverberation chamber. This is aiming to improve the accuracy of the numerical analysis method for the electromagnetic compatibility estimation of the Boeing 777 class large aircraft based on finite-difference time-domain (FDTD) technique. Firstly, the FDTD analysis results of B777-200ER aircraft are compared with that of measured results. The dependencies of material constants of the aircraft model are briefly discussed. Secondly, the EMF loss due to the phenol walls is measured quantitatively using the reverberation chamber. The performance of the chamber is evaluated by the statistical analysis. The field uniformity evaluated by the measured electric field (E-field) strength is less than 3 dB between 500 MHz and 6 GHz. Next, the cumulative distribution function of the measured E-field strength is in good agreement with the theoretical Rayleigh distribution. Finally, the measured quality factor, which is reduced by 20 % at 2 GHz and 25 % at 5 GHz, confirms the loss of EMF due to the phenol walls., IEEE

Numerical estimations of propagation characteristics and interference path loss due to personal electric device in a commercial aircraft cabin
Akiko Kohmura, Masami Shirafune, Naruto Yonemoto, Shunichi Futatsumori, Toshio Nojima, Takashi Hikage, 2014 IEEE International Workshop on Electromagnetics (iWEM), 243, 244, 01 Aug. 2014
IEEE

Local SAR in anatomical phantom implanted with metallic osteosynthesis plates in mandibular exposed to 2 GHz RF fields
Takashi Hikage, Tomoaki Nagaoka, Taisuke Ono, Toshio Nojima, Soichi Watanabe, 2014 IEEE International Workshop on Electromagnetics (iWEM), 209, 210, 01 Aug. 2014
RF exposure guidelines recognize that an increase in local SAR due to metallic implants is possible, depending upon the size and shape of the implant and the position. This study describes the local SAR calculations for an anatomical human with metallic osteosynthesis plates embedded in the mandibular zone exposed to 2GHz RF fields; FDTD analysis is applied. The main objective is to assess whether combination of two metallic plates aligned in parallel in the head region could be expected to cause SAR enhancements under near-field exposure condition at 2 GHz., IEEE

Estimation of the Electromagnetic Fields Excited by a Cellular Phone in a Typical Aircraft Cabin
Masami Shirafune, Takashi Hikage, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto, IEICE Proceeding Series, 18, 14A1-H1, 12 May 2014
The aim of this study is to develop accurate and reliable estimation method of EMF distributions in aircraft that can contribute to numerical EMI assessment technique. Electromagnetic field distributions created by a cellular inside an aircraft cabin are analyzed and propagation characteristics are discussed from the analysis results. We use FDTD technique and a large-scale parallel computing technique to precisely estimate the field distributions inside cabin of a Boeing 777-200 aircraft model., The Institute of Electronics, Information and Communication Engineers, English

Implantable Cardiac Pacemaker EMI Triggered by HF-band Wireless Power Transfer Coils
Takashi Hikage, Masami Shirafune, Toshio Nojima, IEICE Proceeding Series, 18, 14P2-H2, 12 May 2014
We introduce a numerical assessment methodology to understand the EMI imposed by magnetic resonance type wireless power transfer systems on active implantable medical devices ( implantable cardiac pacemaker / cardioverter defibrillator). A numerical estimation model that consists of magnetic resonant coils and a human torso phantom with a pacemaker model is constructed. Numerical simulation based on the finite element method yields the interference voltage induced at the connector of the pacemaker inside the torso phantom. Our example assumes magnetic resonance coils operating in the frequency band of 10 MHz., The Institute of Electronics, Information and Communication Engineers, English

B-4-4 Effects on Electromagnetic Field Characteristics Inside Aircrafts Due to Internal Structures : Measurement of Quality Factor of Cubic Reverberation Chamber With Phenol Internal Walls
FUTATSUMORI Shunichi, MORIOKA Kazuyuki, KOHMURA Akiko, YONEMOTO Naruto, SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the IEICE General Conference, 2014, 1, 342, 04 Mar. 2014
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-34 Numerical Analysis of Local SAR of Human Model Implanted with Visual Prosthesis Featuring Wireless Power Transfer Coil in Head
HIKAGE Takashi, ONO Taisuke, NOJIMA Toshio, YONEZAWA Eiji, OSAWA Kouji, Proceedings of the IEICE General Conference, 2014, 1, 372, 04 Mar. 2014
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-40 SAR & Temperature Elevation Estimations for a Phantom Model Implanted with Metal Plates Exposed to 2GHz Radio-Waves
ONO Taisuke, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi, Proceedings of the IEICE General Conference, 2014, 1, 378, 04 Mar. 2014
The Institute of Electronics, Information and Communication Engineers, Japanese

BI-4-4 In vitro Assessments of Active Implantable Medical Devices EMI from Radio Wave Emitted by Wireless Power Transfer Devices
HIKAGE Takashi, SHIRAFUNE Masami, NOJIMA Toshio, FUJIMOTO Hiroshi, IWAI Hiroshi, Proceedings of the IEICE General Conference, 2014, 1, "SS, 92"-"SS-93", 04 Mar. 2014
The Institute of Electronics, Information and Communication Engineers, Japanese

Numerical Modeling for SAR Evaluation in Human Implanted with Osteosynthesis Plates of mandibular fractures
日景 隆, BioEM2014, -, 97, 99, 2014, [Peer-reviewed]

有限要素法による磁界共振型ワイヤレス電力伝送コイル近傍の植込み型心臓ペースメーカ干渉誘起電圧推定
日景 隆, 電子情報通信学会技術研究報告, vol. 114, no. 246, 19, 22, 2014

Large-scale FDTD analysis to obtain precise propagation characteristics of in-flight wireless access service
Takashi Hikage, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto, 2013 Africon, 1, 4, Sep. 2013
Electromagnetic field distributions created by a 2 GHz band wireless transmitter inside an aircraft cabin are analyzed and propagation characteristics are discussed from the analysis results. We use FDTD technique and a large-scale parallel computing technique to precisely estimate the field distributions inside cabin of a Boeing 777-200 aircraft model. In order to validate FDTD analysis results, the calculated electric field distribution is compared to actual field measurement in the aircraft cabin. Additionally, the absorption effect due to passengers can be considered., IEEE

In vitro Assessment of EMI from RFID Interrogator on Implantable Cardiac Pacemakers and Implantable Cardioverter Defibrillators
Takashi Hikage, Masami Shirafune, Toshio Nojima, Hiroshi Fujimoto, Takeshi Toyoshima, IEICE Proceeding Series, 30, 1140, 1143, 20 May 2013, [Peer-reviewed]
Electromagnetic interference (EMI) characteristics of implantable cardiac pacemakers and cardioverter defibrillators (ICDs) based on assessments of RFID interrogators are described in this paper. Examples of interrogators operating in various RF bands are tested to estimate EMI experienced by pacemakers and ICDs. The EMI test set-up and some experimental evaluation results for practical devices are shown. Observed characteristics of the EMI occurrence are discussed based upon the transmission radio wave specifications., The Institute of Electronics, Information and Communication Engineers, English

B-4-11 Thermographic SAR Estimation in a Phantom Model lmplanted with Metal Plates Exposed to 2 GHz Radio-Waves
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi, Proceedings of the IEICE General Conference, 2013, 1, 356, 05 Mar. 2013
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-51 Numerical Estimation of RF Leakage from Wireless Access Point Operating in High-Speed Train Car
SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi, Proceedings of the IEICE General Conference, 2013, 1, 51, 05 Mar. 2013
The Institute of Electronics, Information and Communication Engineers, Japanese

In vitro Assessment of EMI from RFID Interrogator on Implantable Cardiac Pacemakers/cardioverter defibrillators
HIKAGE Takashi, KAWAMURA Yoshifumi, NOJIMA Toshio, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi, 電気学会研究会資料. EMC, 電磁環境研究会, 2013, 1, 37, 40, 05 Mar. 2013
Japanese

Construction of the first genetic linkage map of Japanese gentian (Gentianaceae)
Takashi Nakatsuka, Eri Yamada, Misa Saito, Takashi Hikage, Yuka Ushiku, Masahiro Nishihara, BMC Genomics, 13, 1, 672, 28 Nov. 2012
Abstract

Background
Japanese gentians (Gentiana triflora and Gentiana scabra) are amongst the most popular floricultural plants in Japan. However, genomic resources for Japanese gentians have not yet been developed, mainly because of the heterozygous genome structure conserved by outcrossing, the long juvenile period, and limited knowledge about the inheritance of important traits. In this study, we developed a genetic linkage map to improve breeding programs of Japanese gentians.


Results
Enriched simple sequence repeat (SSR) libraries from a G. triflora double haploid line yielded almost 20,000 clones using 454 pyrosequencing technology, 6.7% of which could be used to design SSR markers. To increase the number of molecular markers, we identified three putative long terminal repeat (LTR) sequences using the recently developed inter-primer binding site (iPBS) method. We also developed retrotransposon microsatellite amplified polymorphism (REMAP) markers combining retrotransposon and inter-simple sequence repeat (ISSR) markers. In addition to SSR and REMAP markers, modified amplified fragment length polymorphism (AFLP) and random amplification polymorphic DNA (RAPD) markers were developed. Using 93 BC1 progeny from G. scabra backcrossed with a G. triflora double haploid line, 19 linkage groups were constructed with a total of 263 markers (97 SSR, 97 AFLP, 39 RAPD, and 30 REMAP markers). One phenotypic trait (stem color) and 10 functional markers related to genes controlling flower color, flowering time and cold tolerance were assigned to the linkage map, confirming its utility.


Conclusions
This is the first reported genetic linkage map for Japanese gentians and for any species belonging to the family Gentianaceae. As demonstrated by mapping of functional markers and the stem color trait, our results will help to explain the genetic basis of agronomic important traits, and will be useful for marker-assisted selection in gentian breeding programs. Our map will also be an important resource for further genetic analyses such as mapping of quantitative trait loci and map-based cloning of genes in this species.
, Springer Science and Business Media LLC

Numerical Estimations of the Propagation Characteristics of Wireless Links in High-speed Train Cars
Takashi Hikage, Masami Shirafune, Toshio Nojima, Wataru Yamada, Takatoshi Sugiyama, IEICE Proceeding Series, 15, 2C1-5, 29 Oct. 2012
This paper evaluates the propagation characteristics in a High-Speed Train Car. Demand for wireless broadband access services in long-distance transportations continues to grow. Several railway companies have recently begun in-car wireless LAN services. In order to advance the radio link design in support of such services, an accurate and reliable method for estimating the electromagnetic environment in actual situations is required. This study introduces an accurate and reliable method of estimating electromagnetic field distributions in train cars so as to advance the radio link design of wireless LANs operated inside high-speed train cars. The authors previously proposed an EMF estimation method for a typical commuter train based on FDTD analysis and parallel computing. Using newly developed numerical models of high-speed train car, which include many passengers, electromagnetic field distributions created by a 5.2 GHz wireless transmitter inside the cars are analyzed and propagation characteristics are evaluated. In order to estimate the effect of the absorption by the passengers' bodies, simplified histograms of the electric field distributions throughout the whole interior of the car are derived., The Institute of Electronics, Information and Communication Engineers, English

Whole-body Averaged SAR Measurements of Postured Phantoms Exposed to E-/H-polarized Plane-wave Using Cylindrical Field Scanning
Yoshifumi Kawamura, Takashi Hikage, Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe, IEICE Proceeding Series, 15, POS1-47, 29 Oct. 2012
The aim of this study is to achieve experimental estimation of whole-body averaged specific absorption rate (WB-SAR) of human models using the radiation-field scanning technique. The authors have proposed an experimental estimation method using the total power absorbed by human; a cylindrical external field scanning technique is used to measure the radiated RF (radio-frequency) power. In this paper, in order to estimate the difference in WB-SAR due to the size of the phantoms and exposure condition, measured WB-SARs for standing and sitting Japanese human phantoms are shown., The Institute of Electronics, Information and Communication Engineers, English

Harmonic Matching and Reflecting Amplifiers with 2nd and 3rd Harmonic Phase Tuning
Ken Hiraga, Takashi Hikage, Manabu Yamamoto, Toshio Nojima, IEICE Proceeding Series, 15, 1E4-3, 29 Oct. 2012
In this paper, we introduced a harmonic reflection filter for Class-F amplifiers that can provide tunable phases for the second and third harmonics independently. The harmonic filter reflects the second and third harmonics at the appropriate phase and has no effect on the fundamental frequency. This filter simplifies the precise phase settings for the second and third harmonics and promises to enable the achievement of highly efficient class-F operations. In the results of experiments, we clarified that the third harmonic phase tuning function of the proposed harmonic reflection filter improves efficiency by 30 %. Thus tuning function of the third harmonic phase is important for energy efficiency of microwave power amplifiers for radio communication and wireless power transmission applications., The Institute of Electronics, Information and Communication Engineers, English

Numerical assessment methodology for active implantable medical device EMI due to magnetic resonance wireless power transmission antenna
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, Eugenia Cabot, International Symposium on Electromagnetic Compatibility - EMC EUROPE, 1, 6, Sep. 2012
This paper introduces a numerical assessment methodology of the EMI triggered by magnetic resonance wireless power transmission antennas and imposed on active implantable medical devices such as implantable-cardiac pacemakers and cardioverter defibrillators. A numerical estimation model that consists of magnetic resonant coils and a human torso phantom is constructed. Interference voltage induced at the connector of the pacemaker inside the human phantom is calculated. We consider, as an example, magnetic resonance WPT antennas operating the frequency band of 10 MHz, with air-gap of less than 0.5 m. Finally, the calculated interference voltage is compared with the EMI characteristics obtained by in-vitro EMI experiments., IEEE

EMI risk assessment of electromagnetic field from mobile phone in elevator cabin for implantable pacemaker
Takashi Hikage, Junji Higashiyama, Toshio Nojima, Yoshiaki Tarusawa, International Symposium on Electromagnetic Compatibility - EMC EUROPE, 1, 6, 01 Sep. 2012
The electromagnetic interference impact of a mobile phone to implantable medical device in an elevator cabin is discussed based on electric field distribution measurement data. To measure the field strength, a simulated elevator cabin is constructed according to industry standards, which conform to wheelchair use. The resultant measured field strength shows that there is no electric field strength that has the potential to yield electromagnetic interference between an implantable cardiac pacemaker and a mobile phone if the isolation distance recommended by the pacemaker user guidelines is maintained for the implanted cardiac pacemaker., IEEE

B-1-22 Electric Characteristics of Cabin Sidewall Panel in Large Passenger Aircrafts : Dielectric Constant Measurements of Phenol FRP
FUTATSUMORI Shunichi, KOHMURA Akiko, ISOZAKI Eiju, YONEMOTO Naruto, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the Society Conference of IEICE, 2012, 1, 22, 28 Aug. 2012
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-19 In vitro Assessments of Active Implantable Medical Devices EMI from Radio Wave Emitted by LTE Wireless Devices
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi, Proceedings of the Society Conference of IEICE, 2012, 1, 315, 28 Aug. 2012
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-44 Direction-of-Arrival Dependence Analysis of Local SAR of Human Model Implanted with Medical Metal Plates in Head
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi, Proceedings of the IEICE General Conference, 2012, 1, 374, 06 Mar. 2012
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-50 Propagation Characteristics for Wireless Communications in High-Speed Train Cars
HIKAGE Takashi, SHIRAFUNE Masami, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi, Proceedings of the IEICE General Conference, 2012, 1, 50, 06 Mar. 2012
The Institute of Electronics, Information and Communication Engineers, Japanese

Numerical Estimation on Active Implantable Medical Device EMI due to Magnetic Resonance Wireless Power Transmission Coils
日景 隆, 34th Annual Conference of The Bioelectromagnetics Society, -, 87, 89, 2012, [Peer-reviewed]

Early-stage primary malignant melanoma of the esophagus detected simultaneously with esophageal squamous cell carcinoma
Makoto Hikage, Ko Onodera, Goh Miyata, Toru Hoshida, Hironobu Sasano, Hiroshi Kikuchi, Hirofumi Ichikawa, Takashi Kamei, Fumiyoshi Fujishima, Toru Nakano, Susumu Satomi, Motoo Fujita, Jin Teshima, Esophagus, 9, 33, 38, 03 Dec. 2011
Primary malignant melanoma of the esophagus is a rare disease. The majority of patients are diagnosed at an advanced stage, and only a few are detected at an early stage. We herein describe a case of early-stage primary malignant melanoma of the esophagus that was detected simultaneously with early-stage primary esophageal squamous cell carcinoma. Both tumors were detected during esophagogastroduodenoscopy for heartburn. The malignant melanoma tumor was a nevus-like flat-type lesion in the upper thoracic esophagus, and the squamous cell carcinoma was a slightly depressed lesion in the abdominal esophagus. The tumor was resected by thoracoscopic esophagectomy. Histologically, the invasion of both tumors was limited to the mucosal layer, and no lymph node metastasis was detected. Immunohistochemically, the malignant melanoma cells were strongly positive for HMB-45, melan-A, and S-100 protein. The patient has survived without recurrence for 17 months after the operation., Springer Science and Business Media LLC

Applicability Evaluation of Flat Torso Phantom with Back Absorbing Plate for Active Implantable Medical Devices' EMI Test Based on FDTD Analysis
IRIE Yohei, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, 電子情報通信学会技術研究報告. EMCJ, 環境電磁工学, 111, 335, 71, 74, 02 Dec. 2011
Japanese

Propagation Characteristics of Wireless Communications in Crowded Train Cars
Takashi Hikage, Toshio Nojima, Wataru Yamada, Takatoshi Sugiyama, IEICE Proceeding Series, 53, WeE1-2, 25 Oct. 2011
Electromagnetic field (EMF) distributions created by a 5.2 GHz wireless transmitter inside train cars are analyzed and propagation characteristics are determined from the analysis results. We use the FDTD technique and a large-scale parallel computing technique to precisely estimate the EMF distributions inside cars with passengers., The Institute of Electronics, Information and Communication Engineers, English

A single-base substitution suppresses flower color mutation caused by a novel miniature inverted-repeat transposable element in gentian
Masahiro Nishihara, Takashi Hikage, Eri Yamada, Takashi Nakatsuka, Molecular Genetics and Genomics, 286, 5-6, 371, 382, 15 Oct. 2011
We investigated the genetic basis for the derivation of pink coloration in petals from blue flowers in cultivated gentians. Using a revertant blue-flower phenotype that arose spontaneously from a pink-flowered cultivar, we sought to elucidate the molecular mechanism of flower color restoration caused by a suppressor mutation. Detailed sequencing analysis identified three novel deficient flavonoid 3',5'-hydroxylase (F3'5'H) alleles in pink-flowered gentians in addition to two mutations identified previously (Nakatsuka et al. in Mol Genet Genomics 275:231-241, 2006). Among the deficient alleles, one allele that contained a novel miniature inverted-repeat transposable element (GtMITE1) insertion in an intron of F3'5'H was shown to cause missplicing, resulting in abnormal F3'5'H transcripts and the pink-flower phenotype. The other two mutations were identified as a single-nucleotide insertion and gypsy-Ty3 retrotransposon (Tgt1) insertion within exon 1 and exon 2 of the F3'5'H gene, respectively. The blue-flowered revertant mutant contained a single-nucleotide spontaneous mutation immediately 3' of the TAA target site duplication and the GtMITE1 insertion, which caused restoration of normal splicing of F3'5'H and the normal blue-flower phenotype. Transient expression assays in gentian flowers in vivo demonstrated that normal F3'5'H splicing pattern was recovered from missplicing induced by the GtMITE1 insertion by the single-nucleotide substitution. These findings extend our knowledge of genomic evolution by transposable elements and spontaneous mutations in Gentiana species of economic and medical importance., Springer Science and Business Media LLC

Development of DNA markers that discriminate between white- and blue-flowers in Japanese gentian plants
Takashi Nakatsuka, Misa Saito, Yuka Sato-Ushiku, Eri Yamada, Takashi Nakasato, Nobue Hoshi, Kazumichi Fujiwara, Takashi Hikage, Masahiro Nishihara, Euphytica, 184, 3, 335, 344, 22 Sep. 2011
Springer Science and Business Media LLC

B-1-22 Estimation of Propagation Characteristics of Cellular Radio in an Aircrafi Cabin Using FDTD Method
KINOSHITA Masaki, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Shunichi, KOHMURA Akiko, YONEMOTO Naruto, Proceedings of the Society Conference of IEICE, 2011, 1, 22, 30 Aug. 2011
The Institute of Electronics, Information and Communication Engineers, Japanese

BI-3-4 Experimental Estimation and Mitigation Technique for Active Implantable Medical Devices EMI from RFID Interrogators
KAWAMURA Yoshifumi, FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, KOIKE Ben, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi, Proceedings of the Society Conference of IEICE, 2011, 1, "SS, 39"-"SS-40", 30 Aug. 2011
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-14 Standing Wave Suppression inside Flat Torso Phantom for EMI Test on Active implantable medical devices
IRIE Yohei, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the Society Conference of IEICE, 2011, 1, 327, 30 Aug. 2011
The Institute of Electronics, Information and Communication Engineers, Japanese

Numerical estimation methodology for RFID/Active Implantable Medical Device-EMI based upon FDTD analysis
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, 2011 XXXth URSI General Assembly and Scientific Symposium, 1, 4, 01 Aug. 2011
A numerical estimation methodology for RFID /Active Implantable Medical Device (AIMD) EMI based upon FDTD analysis is presented. This methodology can be applied to low-band RFID. In this paper, an example for RFID interrogator in the frequency band of 13.56 MHz (ISO/IEC 18000–3 MODE 1) is shown. It assumes that RFID interrogators operating in the low or HF frequency bands might cause EMI on the AIMDs through the interference voltage induced by the magnetic flux excited by the RFID interrogator. Calculated interference voltage was compared with the EMI characteristics obtained by in-vitro EMI experiments to validate the analysis result. The estimated EMI characteristics obtained by the experiments and the FDTD analysis agreed well., IEEE

B-4-18 FDTD Analysis Using Precise Numerical Human Models to Verify the Experimental Whole-Body Averaged SAR Estimation Method
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi, Proceedings of the IEICE General Conference, 2011, 1, 331, 28 Feb. 2011
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-25 Propagation Characteristics in Crowded Train Cars for Wireless Communications
HIKAGE Takashi, OKAMURA Ryohei, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi, Proceedings of the IEICE General Conference, 2011, 1, 25, 28 Feb. 2011
The Institute of Electronics, Information and Communication Engineers, Japanese

Gynogenesis in gentians (Gentiana triflora, G. scabra): production of haploids and doubled haploids
Hisako Doi, Shuji Yokoi, Takashi Hikage, Masahiro Nishihara, Ken-ich Tsutsumi, Yoshihito Takahata, Plant Cell Reports, 30, 6, 1099, 1106, 09 Feb. 2011
Gynogenesis was investigated on gentian (Gentiana triflora, G. scabra and their hybrids), which is an important ornamental flower. When unfertilized ovules were cultured in 1/2 NLN medium containing a high concentration of sucrose (100 g/l), embryo-like structures (ELS) were induced. Although genotypic variation was observed in ELS induction, all four genotypes produced ELSs ranging from 0.93 to 0.04 ELSs per flower bud. The ovules collected from flower buds of later stages (just before anthesis or flower anthesis) tended to exhibit higher response. The dark culture condition produced more than four times as many ELSs than in 16-h light condition. A significant number of plantlets were directly regenerated from ELSs on MS regeneration medium. The ploidy levels of 179 regenerated plants were determined by flow cytometry, revealing that the majority of them were diploid (55.9%) and haploid (31.3%). When a total of 54 diploid plants were examined by molecular genetic markers, 52 (96.3%) were considered as doubled haploids (DHs). This is the first report showing successful gynogenesis in gentian. The production of haploids and DHs by unfertilized ovule culture opens a novel prospect in gentian F1 hybrid breeding., Springer Science and Business Media LLC

Development of Simple Sequence Repeat Markers for Identification of Japanese Gentian Cultivars
Sato-Ushiku Yuka, Shimada Norimoto, Saito Misa, Yamada Eri, Hikage Takashi, Nakatsuka Takashi, Nishihara Masahiro, Journal of the Japanese Society for Horticultural Science, 80, 4, 475, 485, 2011
Japanese cultivated gentians (Gentiana triflora, G. scabra and their hybrids) are economically important floricultural plants and their use is growing annually worldwide. We isolated 48 simple sequence repeat (SSR) markers using a SSR-enriched genomic library constructed from a gentian double haploid (DH) line. We demonstrated the utility of these SSR markers as a molecular tool for identification of vegetative-propagated gentian cultivars that are difficult to distinguish from their morphology. Five SSR loci showed high genetic polymorphism among 12 Japanese gentian cultivars, ranging from five to eight alleles per locus, with expected heterozygosity between 0.656 and 0.826, and enabled simple and precise identification of cultivars. It was confirmed that the markers were suitable to estimate genetic similarity among cultivars and were also applicable to ten related Gentiana species. This is the first report of the development of a comprehensive set of SSR markers in Japanese cultivated gentians to facilitate genomic analyses in Gentiana, including species of economic importance.
, THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE, English

Analysis of novel transposable element involved in pink coloration in gentian
Nakatsuka Takashi, Hikage Takashi, Nishihara Masahiro, Plant and Cell Physiology Supplement, 2011, 0386, 0386, 2011
Japanese cultivated gentians naturally show blue flowers, but some pink-flowered cultivars have been bred using natural flower color mutants. The pink coloration in genitan was reported to be derived from the insertion of transposable elements (GsTRIM1 and dTgs1) into flavonoid 3',5' hydroxylase (F3'5'H) gene (Nakatsuka et al. 2006). In this study, we attempted to reveal the reasons responsible for two other pink-flowered genitan cultivar/lines. We tried to isolate and characterize the F3'5'H genomic and cDNA sequences from two pink-flowered gentians and one blue flowered gentian as a control. As the result, new two mutated F3'5'H loci were found in the pink gentian. One is the insertion of novel transposable element-like sequence (322 bp in length) into 1st intron, the other is a single base T-insertion into 1st exon of F3'5'H gene. The former induced mis-splicing and the latter caused frame shift mutation of F3'5'H gene. We found the revertant phenotype from pink to blue flowers in one pink gentian cultivar and the detailed analyses are now in progress.
Nakatsuka et al. (2006) Molecular Genetics and Genomics 275: 231-241., The Japanese Society of Plant Physiologists

Gentian extract induces caspase-independent and mitochondria-modulated cell death
Takashi Hikage, Kikukatsu Ito, Ken-ichi Tsutsumi, Mika Ogata, Yasushi Saitoh, Kiyomi Kogusuri, Tetsuro Yamashita, Kazushige Matsukawa, Advances in Biological Chemistry, 01, 49, 57, 01 Jan. 2011
Extracts from the dried roots of gentian plant, Gentiana triflora, exhibit an antiproliferative activity against cultured and implanted tumor cells. However, the underlying mechanism has been unclear. In the present study, we show that the cell death induced by the extract occurs caspase-independently and depends on metabolic status of mitochondrial respiration. We observed that sensitivity to the extract was considerably lower in HeLa cells, which have a low rate of mitochondrial respiration, in comparison to Y3-Ag1.2.3 cells, which have a higher rate of respiration. Furthermore, sensitivity of HeLa cells to the extract increased significantly when they were forced to switch their energy dependency from glycolysis to mitochondrial respiration. These results indicate that the gentian extract targets on mitochondrial respira-tion. Consequently, different respiratory activities in mitochondria confer cells to have different suscepti-bilities to the extract-induced cell death., Scientific Research Publishing, Inc.

Shear power spectrum reconstruction using the pseudo-spectrum method
Chiaki Hikage, Masahiro Takada, Takashi Hamana, David Spergel, Monthly Notices of the Royal Astronomical Society, 412, 1, 65, 74, 10 Dec. 2010
We develop a pseudo power spectrum technique for measuring the lensing power spectrum from weak lensing surveys in both the full sky and flat sky limits. The power spectrum approaches have a number of advantages over the traditional correlation function approach. We test the pseudo spectrum method by using numerical simulations with square-shape boundary that include masked regions with complex configuration due to bright stars and saturated spikes. Even when 25% of total area of the survey is masked, the method recovers the E-mode power spectrum at a sub-percent precision over a wide range of multipoles 100
11 pages, 4 figures, accepted for publication in MNRAS, Oxford University Press (OUP)

Estimation of the Electromagnetic Fields Distribution due to Mobile Radio in a Typical Aircraft Cabin Using Large Scale FDTD Analysis
Shinya Hiraiwa, Takashi Hikage, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto, IEICE Proceeding Series, 52, 3TE4-4, 23 Nov. 2010
In this paper, electromagnetic field (EMF) distributions excited by mobile radio inside an aircraft cabin are analyzed and propagation characteristics are evaluated based upon the analysis results. Wireless communication devices usage has extended to a wide range of environments such as buses, trains, and aircrafts. Recently, some airlines have begun allowing in-flight voice calls. On the other hand, some paper reported that electromagnetic interference (EMI) to aircraft systems from active radio transmitters is possible [1,2]. The aim of this study is to develop accurate and reliable estimation method of EMF distributions in aircraft that can contribute to numerical EMI assessment technique. In an actual environment, comprehensive measurements cost too much and it is difficult to carry them out precisely. Therefore, we proposed to apply large-scale numerical simulations to examine the EMF excited by mobile radio [3]-[5]. The FDTD technique is a versatile and efficient tool for the solution of Maxwell’s equations in complex structures [6]-[8]. In addition, Large-scale parallel computing technique based upon several node partitions of a supercomputer is used because of its memory and speed capabilities [9]. It is able to give us a good perspective within a reasonable computation time. We have used Boeing 777-200 aircraft model and employed the FDTD technique and a supercomputer to estimate propagation characteristics inside aircraft cabin in this paper., The Institute of Electronics, Information and Communication Engineers, English

W14/15 esterase gene haplotype can be a genetic landmark of cultivars and species of the genus Gentiana L
Takashi Hikage, Kiyomi Kogusuri, Claire Tanaka-Saito, Shuji Watanabe, Sakura Chiba, Kohei Kume, Hisako Doi, Yasushi Saitoh, Yoshihito Takahata, Ken-ichi Tsutsumi, Molecular Genetics and Genomics, 285, 1, 47, 56, 27 Oct. 2010
We have identified multiple alleles for a single gene termed W14/15. This gene encodes closely related but not identical proteins W14 and W15 that accumulate in overwinter buds of Gentiana triflora (Takahashi et al. in Breed Sci 56:39-46, 2006; Hikage et al. in Mol Genet Genomics 278:95-104, 2007). In this study, structural analysis of the W14/15 gene was carried out for 21 different gentian lines/cultivars consisting of 5 different species, to survey species- or line/cultivar-specific haplotypes. Within the samples examined, multiple variant forms were found. Those were categorized into seven major types (type I-VII) and ten subtypes based on the presence of three short insertion/deletion sites, three RFLP sites, and several SNP sites. Each line/cultivar had a distinct set of W14/15 gene variants for an allelic pair. Phylogenetic analysis showed that the W14/15 alleles cluster into groups that are characteristic of gentian species, i.e., G. triflora, G. scabra, G. pneumonanthe, G. septemfida and an unknown species other than the former four. In addition, within the same gentian species, different sets of haplotypes were found. Thus, the W14/15 alleles provide useful landmarks to resolve phylogenies of the genus or section Gentiana, as well as to analyze pedigree and breeding history of the cultivars derived from those Gentiana sp., Springer Science and Business Media LLC

Protein engineering: Construction of Robust Bio‐nanotubes using the Controlled Self‐Assembly of Component Proteins of Bacteriophage T4 (Small 17/2010)
Atsuo Suzuki, Yoshihito Watanabe, Fumio Arisaka, Norihiko Yokoi, Katsuhide Yutani, James K. Gimzewski, Hiroshi Inaba, Nusrat J. M. Sanghamitra, Tomomi Koshiyama, Shuji Kanamaru, Makoto Terauchi, Susumu Kitagawa, Takafumi Ueno, Adam Z. Stieg, Tatsuo Hikage, Takashi Yamane, Small, 6, 17, 1873, 1879, 06 Sep. 2010
of functional molecules at appropriate sites. Thus, it has remained challenging to obtain tube structures with high sta-bility and well-defi ned nanoscale lengths for properly aligning synthetic molecules on the surfaces of the nanotubes. The β -helical protein motif holds promise as a candidate to overcome these problems. This motif occurs predominantly in native tubular structural proteins such as antifreeze proteins, prions, and viruses., Wiley

B-1-23 Analysis of Polarization Characteristics in an Airplane Using FDTD Method
HIRAIWA Shinya, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Shunichi, KOHMURA Akiko, YONEMOTO Naruto, Proceedings of the Society Conference of IEICE, 2010, 1, 23, 31 Aug. 2010
The Institute of Electronics, Information and Communication Engineers, Japanese

Numerical estimation of EMI impact on implantable cardiac pacemakers in elevator using EMF distributions inside human body
Hikage, Takashi, Nojima, Toshio, Simba, Ally Y., Watanabe, Soichi, 2010 IEEE Antennas and Propagation Society International Symposium (APSURSI), 1, 4, Jul. 2010
© 2010 IEEE. Reprinted, with permission, from Hikage, T., Nojima, T., Simba, A.Y., Watanabe, S., Numerical estimation of EMI impact on implantable cardiac pacemakers in elevator using EMF distributions inside human body, 2010 IEEE Antennas and Propagation Society International Symposium (APSURSI), Jul. 2010. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Hokkaido University products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it., English

Nano-imaging of the lymph network structure with quantum dots
Makoto Hikage, Kohsuke Gonda, Motohiro Takeda, Takashi Kamei, Masaki Kobayashi, Masutaka Kumasaka, Mika Watanabe, Susumu Satomi, Noriaki Ohuchi, Nanotechnology, 21, 18, 185103, 14 Apr. 2010
Sentinel lymph node diagnosis contributes to operative strategy in cancer surgery. During lymph node metastasis, cancer cells first reach the sentinel lymph node (SLN) via lymph flow. To perform SLN biopsy effectively, it is important that cancer cells are detected with high sensitivity in SLN connected to the tumor site. Here we present a method to visualize a high-risk area in the SLN for lymph node metastasis with a high degree of accuracy. Quantum dots (QDs), bright fluorescent nanoparticles, were endoscopically injected into the gastrointestinal wall of pigs, and their signal was specifically detected in the SLN with a laparoscopic device. Single-particle imaging under a confocal microscope showed that the QDs were distributed heterogeneously in the SLN and that their distribution marked the inflow locus of afferent lymphatic vessels where lymph node metastasis begins. Moreover, we developed a method using cellular marker conjugated QDs that visualizes specific cells in SLNs, suggesting that this method can be applied for the detection of cancer cells in sentinel lymph nodes using tumor-specific-molecular conjugated QDs. These results show that our method might significantly increase the detection rate of cancer metastasis in SLNs., IOP Publishing

B-4-48 Whole-Body Averaged SAR Estimation for Postured Japanese Numerical Human Models
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi, Proceedings of the IEICE General Conference, 2010, 1, 398, 02 Mar. 2010
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-5 Inter-car Propagation Characteristics for Wireless communications in Train cars
HIKAGE Takashi, KITAGAWA Atsushi, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi, Proceedings of the IEICE General Conference, 2010, 1, 5, 02 Mar. 2010
The Institute of Electronics, Information and Communication Engineers, Japanese

Embryogenesis and doubled haploid production from anther culture in gentian (Gentiana triflora)
Hisako Doi, Ryo Takahashi, Takashi Hikage, Yoshihito Takahata, Plant Cell, Tissue and Organ Culture (PCTOC), 102, 1, 27, 33, 10 Feb. 2010
The overall goal of this study is to develop an anther culture system to produce doubled haploid (DH) lines of gentian (Gentiana triflora), an ornamental flowering plant, for use in an F1 hybrid breeding program. Embryogenesis was induced from anther cultures incubated on half-strength modified Lichter (NLN) medium containing a high concentration of sucrose (130 g/l) and subjected to heat shock treatment. Among the various parameters investigated, anthers collected from buds 9–12 mm in length induced the highest frequency of androgenesis. Moreover, among three genotypes tested, cvs. Ashiro-no-Aki and Ashiro-no-Natsu produced 21.3 and 3.7 embryos per 100 anthers, respectively, whereas, cv. Lovely-Ashiro failed to produce embryos. Among a total of 427 embryos transferred to a regeneration medium consisting of Murashige and Skoog (MS) medium, 138 plants were regenerated. The ploidy levels of regenerants were determined by flow cytometry and chromosome counts, revealing the presence of 5% haploids, 25% diploids, and 70% triploids. Inter simple sequence repeat (ISSR) analysis using the 6PS line obtained following self-pollination of the diploid plant obtained from anther culture confirmed that the diploid plant was indeed a DH., Springer Science and Business Media LLC

大規模電磁界数値解析を用いた航空機電磁環境推定
二ッ森俊一, 河村暁子, 米本成人, 日景隆, 野島俊雄, 電子航法研究所研究発表会講演概要, 10th, 2010

Estimation of Direction-of-Arrival Dependence of Whole-Body Averaged SAR in Japanese Human Models Exposed to Plane-Wave
小林範行, 河村由文, 日景隆, 野島俊雄, 長岡智明, 渡邊聡一, 電気学会電磁環境研究会資料, EMC-10, 15-28, 2010

Effect of passive RF exposure from mobile phones on passengers inside an elevator: Comparison between adult and child passengers
Takashi Hikage, Toshio Nojima, Soichi Watanabe, All. Y. Simba, 2009 2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies, 1, 2, 01 Nov. 2009
This paper compares the effect of passive rf exposure on the specific absorption rate and absorbed power of an adult and a child passenger without phones inside an elevator when several other passengers are using their mobile phones simultaneously. The absorbed power and SAR were calculated using finite-difference time-domain. The mobile phones were modeled as half-wavelength dipole antenna placed at the distance of 16 mm from the head, with a transmitting power of 0.25 W. Our results show that child passenger without phone absorbs more power passively as compared to adult passenger. For the case when non-user passenger is surrounded by five passengers using mobile phones, power of 118 and 218 mW were absorbed by the adult and child models, respectively, implying that the passive rf exposure depends on the size of the passengers. Furthermore, the maximum values of the whole-body SARs due to passive exposure are obtained in this work are much smaller than the ICNIRP basic restriction., IEEE

Experimental Set-up for Whole-Body SAR Estimation Based on Cylindrical Scanning of External Electric Field Distribution
Yoshifumi Kawamura, Takashi Hikage, Toshio Nojima, IEICE Proceeding Series, 51, 592, 595, 21 Oct. 2009, [Peer-reviewed]
The aim of this study is to achieve experimental estimation of whole-body averaged specific absorption rate (SAR) of human models using the radiation-field scanning technique. The relationship between the reference level of ICNIRP Guidelines [1] and the whole-body averaged SAR was established mainly based on numerical calculations for highly simplified human modelling. Recently, many dosimetry estimations for human exposure including high accuracy numerical phantom models have been reported [2]. However, due to the difficulty of the measurement in the whole human body exposed by RF plane-wave, there have been a few experimental investigations based on calorimeter or thermography method [3]. It is very important to obtain reliable measurement data that can contribute to validity analyses for the recent precise computational estimations. Previously, we proposed a new whole-body averaged SAR estimation method based on electric power consumption based on the cylindrical field scanning technique [4]. In this paper, we develop the experimental set-up for whole-body averaged SAR estimation using human phantom made of tissue-equivalent material and scaled model. Additionally, measured results of whole-body averaged SAR of standing human for 2GHz far-field exposure are shown., The Institute of Electronics, Information and Communication Engineers, English

B-4-3 Development of a Quasi-Microwave Whole-Body SAR Estimation System using the Cylindrical-External Electric-Field Scanning
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the Society Conference of IEICE, 2009, 1, 286, 01 Sep. 2009
The Institute of Electronics, Information and Communication Engineers, Japanese

C-1-18 An International Inter-laboratory Comparison of SAR Calculation with Virtual Family Model
Hikage Takashi, Kitagawa Atsushi, Nojima Toshio, Proceedings of the Society Conference of IEICE, 2009, 1, 18, 01 Sep. 2009
The Institute of Electronics, Information and Communication Engineers, Japanese

A review of mobile phone usage in enclosed areas and RF safety guideline
Soichi Watanabe, Toshio Nojima, Ally Y. Simba, Takashi Hikage, AFRICON 2009, 1, 6, 01 Sep. 2009
The use of mobile phones in metallic enclosed environments such as elevators, train cars and even airplanes has attract a lot of attention in recent years. In these environments, most of the radio frequency (RF) energy from mobile phones remains inside due to the lack of escape routes, resulting in possibility of the field levels exceeding limits described in the international RF safety guidelines. This has resulted in an anxiety on possible health effects of passengers in these environments. In this review paper, size of the passengers (child vs. adult human model), method of investigation (theory vs. numerical), passenger position, elevator structure etc., are briefly discussed to determine how they affect the RF exposure. We also discuss few experimental investigation related to this problem for the passenger using a mobile phone near a metallic wall. Our objective is to provide an understanding of the SAR characteristics of the mobile phone user in such environment and how these characteristics are affected by the aforementioned factors., IEEE

A novel method of mitigating EMI on implantable medical devices: Experimental validation for UHF RFID reader/writers
Ben Koike, Takashi Hikage, Hiroshi Fujimoto, Toshio Nojima, Shunichi Futatsumori, Takeshi Toyoshima, Yoshifumi Kawamura, 2009 IEEE International Symposium on Electromagnetic Compatibility, 197, 202, 01 Aug. 2009
A method of mitigating the electromagnetic inter-ference (EMI) due to wireless communication devices on im-plantable medical devices (IMDs) such as implantable cardiac-pacemakers and implantable cardioverter-defibrillators (ICDs) is newly proposed. The key feature of the proposed method is that it does not require any modification of the IMDs. This method is based on the use of a “mitigation signal” which lies in the idle periods of the wireless communication device. By using this mitigation signal, the low frequency noise signal generated in the IMDs' internal circuits by nonlinear detection, can be reduced. This leads to a drastic improvement in the maximum interference distance. The proposed method is experimentally confirmed in this paper as applied to UHF RFID reader/writers. First, the proposed EMI mitigation method is detailed. An implementation of the method for UHF RFID reader/writers is then presented. The in vitro EMI experiment uses 3 types of actual implantable cardiac pacemakers. Finally, the mitigation results are shown. The results show the proposed method can greatly shorten the maximum interference distance by more than 90 % for all pacemakers. For example, the maximum interferen-ce distance of one pacemaker is reduced by 68 cm, from 71 cm to 3 cm., IEEE

Whole-body averaged SAR measurement method using cylindrical scanning of external electromagnetic fields
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, 2009 International Symposium on Electromagnetic Compatibility - EMC Europe, 1, 4, Jun. 2009
The final goal of this study is to experimentally estimate the whole-body averaged specific absorption rate (SAR) of humans using the radiation-field scanning technique and a silicone rubber phantom. Dosimetry estimations for human exposure including very numerically accurate phantom models have been reported. However, due to the difficulty of measuring the SAR over the whole human body for the purpose of assessing electromagnetic RF exposure, few investigations have used realistically shaped human phantom models. In this paper, a novel whole-body averaged SAR estimation method based on the power consumption obtained by measuring the radiated power from cylindrical surfaces including humans and the exposure equipment is proposed. Validity of the proposed method based on cylindrical fields scanning is investigated using Finite-Difference Time-Domain (FDTD) calculations for the purpose of designing and developing the experimental system. The calculated whole-body averaged SAR yielded by the proposed method is compared with that obtained by standard calculation methods., IEEE

CS-3-6 ACLR and power efficiency improvements of GaN HEMT power amplifiers using a 5-GHz high-temperature superconducting reaction-type transmitting filter
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori, Proceedings of the IEICE General Conference, 2009, 1, "S, 37"-"S-38", 04 Mar. 2009
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-16 Numerical Analysis of Indoor Propagation of Plane Wave Incident from Side Walls
Hasegawa Tomotsugu, Shoji Tomohito, Omiya Manabu, Hikage Takashi, Proceedings of the IEICE General Conference, 2009, 1, 16, 04 Mar. 2009
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-15 Whole-Body Averaged SAR Estimation Method using Cylindrical Scanning of External Electromagnetic Fields
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the IEICE General Conference, 2009, 1, 358, 04 Mar. 2009
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-3 Numerical Investigation of Passive RF-Exposure Due to Mobile Phone Usage in an Elevator.
SIMBA Ally Y., HIKAGE Takashi, WATANABE Soichi, NOJIMA Toshio, Proceedings of the IEICE General Conference, 2009, 1, 346, 04 Mar. 2009
The Institute of Electronics, Information and Communication Engineers, English

Identification of gentian cultivars using SCAR markers based on intron-length polymorphisms of flavonoid biosynthetic genes
Norimoto Shimada, Takashi Nakatsuka, Yuki Nakano, Yuko Kakizaki, Yoshiko Abe, Takashi Hikage, Masahiro Nishihara, Scientia Horticulturae, 119, 3, 292, 296, Feb. 2009
Elsevier BV

Dentin bond strength of a new adhesive system containing calcium phosphate experimentally developed for direct pulp capping
SHINKAI Koichi, TAIRA Yoshihisa, SUZUKI Masaya, KATO Chikage, EBIHARA Takashi, WAKAKI Suguru, SEKI Hideaki, SHIRONO Manabu, OGISU Takahito, YAMAUCHI Junichi, SUZUKI Shiro, KATOH Yoshiroh, Dental Materials Journal, 28, 6, 2009

短期間に増大し手術治療を要した後頚部痛発症左椎骨動脈解離性動脈瘤の一例
高木輝秀, 五島久陽, 犬飼崇, 犬飼千景, 松尾直樹, 高安正和, 日本頭痛学会誌, 36, 1 (Web), 2009

An experimental validation of a detailed numerical model for predicting implantable medical devices EMI due to low-band RFID reader/writers
Futatsumori, Shunichi, Toyama, Norihiro, Hikage, Takashi, Nojima, Toshio, Koike, Ben, Fujimoto, Hiroshi, Toyoshima, Takeshi, APMC 2008 (Asia-Pacific Microwave Conference, 2008), 1, 4, 16 Dec. 2008
APMC 2008 (Asia-Pacific Microwave Conference, 2008). 16-20 Dec. 2008. Macau, English

FDTD Analysis of Implantable Medical Device EMI Due to Near Field Generated Around HF RFID reader/writers
Norihiro Toyama, Shunichi Futatsumori, Hiroki Seo, Takashi Hikage, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima, IEICE Proceeding Series, 35, 2D02-3, 27 Oct. 2008, [Peer-reviewed]
Radio Frequency Identification (RFID) systems have been attracting wide interest as essential devices for creating an ICT oriented future society. They are expected to achieve various applications such as logistics, manufactures and public utilities. However, radio waves from these systems have the possibility of affecting other electronics devices and causing unwanted malfunctions in certain circumstances. Accordingly, investigations of electromagnetic interference (EMI) have more importance these days. With respect to the EMI affecting implantable-cardiac pacemakers and implantable-cardioverter defibrillators (ICDs), precise investigations should be carried out, because these are used widely in many circumstances. There is a lot of research being conducted to investigate the EMI [1]-[4]. We have carried out detailed in-vitro experiments to assess the EMI due to RFID reader/writers for implantable medical devices (RFID/IMD-EMI) [2]. In addition, numerical models to investigate the RFID/IMD-EMI which is used for FDTD method is constructed [3]. These models include the instruments used in in-vitro EMI experiments such as a human torso phantom and an UHF standard dipole antenna. In this paper, a novel numerical RFID/IMD-EMI estimation methodology based upon FDTD analysis is presented. The RFID/IMD-EMI discussed in this paper is implantable medical device EMI due to HF (13.56 MHz) RFID reader/writers. Firstly, a numerical HF RFID reader/writer antenna model and a human torso phantom model are constructed. Secondly, measured and calculated magnetic field distribution generated around an antenna is compared in order to confirm the validity of the numerical antenna model. Next, interference voltage induced at the connector of the pacemaker is calculated based upon the FDTD method. Finally, to validate the analysis result, the calculated interference voltage is compared with the EMI characteristics obtained by in-vitro EMI experiments., The Institute of Electronics, Information and Communication Engineers, English

An experimental investigation on typical low frequency amplifiers nonlinear response to microwave/quasi-millimeter wave interference
Hiroki Seo, Shunichi Futatsumori, Takashi Hikage, Toshio Nojima, IEICE Proceeding Series, 35, 3D08-3, 27 Oct. 2008
Wireless communication devices such as mobile phones, radio-frequency identification (RFID), electric article surveillance (EAS), and contact less IC cards would be essential components to make up the ubiquitous society. In addition, new wireless devices such as mobile WiMAX and wireless USB have been developed. However, radio waves from these systems have the possibility of affecting other electronics devices and causing unwanted malfunctions in certain circumstances. Accordingly, investigations of electromagnetic interference (EMI) have more importance these days. In particular, EMI effects on medical equipment, including implantable medical devices and other electric instruments used in hospitals, should be precisely investigated because these are used widely in general circumstances. We have been conducting the investigation of the EMI on implantable medical devices [1], [2]. The EMI due to microwave/quasi-millimeter waveband radio waves on low-frequency electronic equipment is mainly caused by nonlinear characteristics of their internal circuits [3]. This is because the envelope of high-frequency signal is detected by the nonlinear response of circuit elements. This nonlinear response is possibly occurred when the frequency of exposure signals is higher than the cut-off frequency of circuit elements. In this paper, a typical low frequency amplifier nonlinear response to microwave/quasimillimeter waveband radio waves is presented. To investigate typical characteristics of interference signals generated by the nonlinear response, interference signal levels depending on frequencies and field strengths of exposure signals are experimentally obtained. Firstly, six types of low frequency basic amplifiers consisting of a single transistor or an operational amplifier IC are fabricated. Secondly, to examine the detection level depending on field strength of a 1 GHz exposure signal, the interference signal is measured. The exposure signal is a sine wave with 80 % amplitude modulation at 1 kHz. Then, to obtain the detection level depending on frequency of exposure signal, EMI experiments using a 1 GHz-25 GHz amplitude modulated signal are conducted. Finally, as practical medical equipment operating at low frequency band, measurement of interference signal using the commercially available hearing aids are carried out to obtain the EMI characteristics of actual devices., The Institute of Electronics, Information and Communication Engineers, English

A Numerical Analysis of Cumulative Probability of Incident Wave Indoor Propagation
Tomotsugu Hasegawa, Yoshinori Iwamoto, Manabu Omiya, Takashi Hikage, IEICE Proceeding Series, 35, 2A01-3, 27 Oct. 2008
This paper discusses and evaluates numerically cumulative probabilities for electromagnetic distributions as well as cross polarization characteristics in the room with a set of furniture. Also the spatially high resolution laboratory model will be developed., The Institute of Electronics, Information and Communication Engineers, English

Radiation Patterns of On-Vehicle Antenna for Simplified Numerical Vehicle Models
Tomohito Shoji, Mitsuru Muramoto, Takashi Hikage, Manabu Omiya, IEICE Proceeding Series, 35, 2A02-1, 27 Oct. 2008
In this paper, we clarify differences of numerical results related to simplified numerical vehicle models by applying the FDTD technique [6], [7]. We use an inverted L element for receiving the digital terrestrial television. First, we compare experimental results with computational ones and show the adequacy of the both results. Next, we clarify the influence of model simplification and its effectiveness comparing the computational results each other., The Institute of Electronics, Information and Communication Engineers, English

ACLR Improvement of a 5-GHz Power Amplifier Using High-Temperature Superconducting Reaction-Type Transmitting Filters
Futatsumori, Shunichi, Hikage, Takashi, Nojima, Toshio, Akasegawa, Akihiko, Nakanishi, Teru, Yamanaka, Kazunori, Proceedings of the 38th European Microwave Conference, 2008, 1, 1145, 1148, Oct. 2008, [Peer-reviewed]
EuMC 2008: 38th European Microwave Conference 2008. 27-31 October 2008. Amsterdam.
Adjacent channel leakage power ratio (ACLR) improvement method of a 5-GHz power amplifier using high-temperature superconducting reaction-type transmitting filters (HTS-RTF) is proposed. The aim of this paper is to clarify the amount of ACLR improvement which is offered by HTS-RTFs. Firstly, measurement results of ACLR improvement using a prototype filter is introduced. The prototype filter has an about 10 dB improvement up to 40 dBm Wideband CDMA (W-CDMA) four-carrier signal, even though the suppression band is one side and the bandwidth is narrow. Secondly, to achieve wider suppression band, their resonator structures are optimized. The split-open ring resonator is modified to obtain higher unloaded Q-factor and lower current density. In addition, 5-GHz HTSRTFs which have 3.5 MHz suppression bands in both sides of the W-CDMA carrier signal are designed. Finally, the ACLR improvement obtained by the newly designed filter is estimated based on numerical analysis. The ACLR is improved by about 10 dB in the both sides. Furthermore, the results show that amplifiers' back-off can be reduced by 5 dB when the HTS-RTFs applied to power amplifiers., The Institute of Electronics, Information and Communication Engineers, English

Measurement of the maximum SAR in a spherical phantom when operating a mobile phone near a metallic wall
Takashi Hikage, Soichi Watanabe, Toshio Nojima, Ally Y. Simba, 2008 First International Symposium on Applied Sciences on Biomedical and Communication Technologies, 1, 4, 01 Oct. 2008
The aim of this paper is to present an experimental investigation of the specific absorption rate (SAR) in a spherical phantom head when operating a mobile phone close to a metallic wall. The mobile phone is modeled as a half-wavelength dipole antenna. The effect of the wall on the peak 10-g SAR and input characteristics of the antenna for two wall orientations are measured. The antenna is set to transmit maximum output power of 250 mW at 900 MHz. A slowly decaying sinusoidal form of the peak 10-g SAR curves, which has been predicted by numerical simulation from several authors including ourselves, is confirmed experimentally for the first time. Under the valid antenna-wall distances used in this work, maximum peak 10-g SAR increase of 7% over the free space value was recorded at the distance of 394 mm away from the wall. Simulated results obtained by the FDTD technique are also presented. Good agreement between the measured and simulated results is obtained., IEEE

C-2-84 ACLR improvements of a power amplifier using a 5-GHz high-temperature superconducting reaction-type transmitting filter
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori, Proceedings of the Society Conference of IEICE, 2008, 1, 109, 02 Sep. 2008
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-5 Numerical Analysis of Oblique Incident Plane Wave Indoor Propagation
Hasegawa Tomotsugu, Shoji Tomohito, Omiya Manabu, Hikage Takashi, Proceedings of the Society Conference of IEICE, 2008, 1, 5, 02 Sep. 2008
The Institute of Electronics, Information and Communication Engineers, Japanese

Numerical analysis of electromagnetic field distributions in a typical aircraft
K. Yamamoto, Toshio Nojima, Manabu Omiya, Takashi Hikage, 2008 International Symposium on Electromagnetic Compatibility - EMC Europe, 1, 4, 01 Sep. 2008
The purpose of this study is to develop accurate and reliable estimation method of Electromagnetic field distributions in practical environments including passengers. However, comprehensive measurements in an actual environment cost too much and it is difficult to carry them out precisely. In this paper, large-scale numerical simulations are carried out to examine the electromagnetic fields excited by the 2.45 GHz wireless LAN terminal inside an aircraft. We used a typical aircraft model and employed the FDTD technique and a supercomputer to estimate the field distributions inside the whole area of the cabin. A Large-scale parallel computing technique based upon several node partitions of a supercomputer was used because of its memory and speed capabilities. It is able to give us a good perspective within a reasonable computation time. Furthermore, a simplified histogram estimation method for electric field strength in the cabin was employed to deal with the complicated EMF distributions inside the cabin including passengers., IEEE

Estimations for Implantable Cardiac Pacemakers EMI from cellular radios in narrow space multi reflection environments
Takashi Hikage, Soichi Watanabe, L.-R. Harris, Toshio Nojima, S. Ally, 2008 Asia-Pacific Symposium on Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility, 128, 131, 01 May 2008
The reason for this study being done is to make an accurate estimate of how the electromagnetic field (EMF) is distributed in environments which are almost completely surrounded by conductive surfaces. Some examples of these types of environments are train carriages, elevators and airplanes. Upon analysis of the results, it would then be possible to investigate in further detail the likelihood of there being any effects by electromagnetic interference (EMI) on implantable cardiac pacemakers in these kinds of environments, commonly referred to as semi-echoic environments., IEEE

An Estimation of Cumulative Probability of Indoor Cross Polarization for Terrestrial Digital Broadcasting
HASEGAWA Tomotsugu, IWAMOTO Yoshinori, OMIYA Manabu, HIKAGE Takashi, ITE Technical Report, 32.33, 31, 34, 2008
The digital terrestrial broadcasting services for mobile receivers had already been started in Japan. The service is effective as communication means at outbreaks of natural disaster. Experimental studies of the reception characteristic in various environments and countermeasures for the deterioration of reception are carried out until now. In this report, we consider the incidence plane wave of digital terrestrial broadcasting due to clarifying its indoor propagation characteristics. A large-scale numerical analysis by using the finite-difference time-domain technique is employed for this purpose. First, two kinds of model, an empty room and a room with a set of furniture are explained in detail. Next, we carry out a computer simulation about indoor propagation of the incident plane wave toward the rooms. Finally, the propagation characteristics for the two models will be discussed., The Institute of Image Information and Television Engineers, Japanese

An Estimation of Radiation Patterns of a Vehicle Mounted Antenna for Digital Terrestrial Broadcasting Reception
SHOJI Tomohito, MURAMOTO Mitsuru, HIKAGE Takashi, OMIYA Manabu, ITE Technical Report, 32.33, 35, 38, 2008
To estimate on-vehicle antenna characteristics accurately, the surrounding environment such as the vehicle body form must be considered in measurements and numerical analysis. This report studies the vehicle model simplification related to radiation patterns of an inverted L antenna for receiving the digital terrestrial television mounted on the vehicle. The numerical evaluations are carried out by employing the FDTD technique. We clarify that the structure of roof and pillar must be considered in computing radiation patterns for four types of numerical model., The Institute of Image Information and Television Engineers, Japanese

HTS Reaction-Type Transmitting Filter Based Upon Split Open-Ring Resonators with Surface Current Density Reduction Technique
Kazunori Yamanaka, S. Futastumori, Akihiko Akasegawa, Teru Nakanishi, Takashi Hikage, Toshio Nojima, 2007 Asia-Pacific Microwave Conference, 1, 4, 01 Dec. 2007
An high-temperature superconducting reaction-type transmitting filter (HTS-RTF) based upon split open-ring resonators with novel surface current density reduction technique is proposed. Since reaction-type resonators do not resonate with high-power fundamental signals, an HTS-RTF enables both high-power handling capability and steep skirt property compared to existing planar-type HTS transmitting filters. However, fundamental signals in the passband induce a current in their resonators. Firstly, to reduce induced currents in the passband, novel split open-ring resonator (SORR) structures that reduce maximum current densities while offering both high-unloaded Q-factors and low radiations are numerically investigated for 5-GHz band operation. Secondly, to further improve the current density dispersion effect, additional slits are introduced to the resonator surface. Then, to validate the analysis results, fabrications and measurements of the resonators are carried out. Measurements confirm an unloaded Q-factor of 68,000 and third intermodulation-distortion of -82 dBc at 30 dBm input power. Finally, design and fabrication of a 5-GHz three-pole reaction-type filter with bandwidth of 1.5 MHz (FBW = 0.03 %) is conducted. The measurement results confirm the fundamental performance of the filter., IEEE

C-2-69 Experimental estimations of a 5 GHz High-Temperature Superconducting reaction-type transmitting filter
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori, Proceedings of the Society Conference of IEICE, 2007, 1, 91, 29 Aug. 2007
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-1 A Study on Cross Polarization Characteristics of Incident Waves
HASEGAWA Tomotsugu, IWAMOTO Yoshinori, OMIYA Manabu, HIKAGE Takashi, Proceedings of the Society Conference of IEICE, 2007, 1, 1, 29 Aug. 2007
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-21 MOBILE-PHONE RF EXPOSUSE FOR MULTIPLE USERS SITUATION IN SEMI-ECHOIC ENVIROMENT : A NUMERICAL INVESTIGATION OF SAR AT 900, 1500 AND 2000MHz
SIMBA Ally Y., HIKAGE Takashi, WATANABE Soichi, NOJIMA Toshio, Proceedings of the Society Conference of IEICE, 2007, 1, 284, 29 Aug. 2007
The Institute of Electronics, Information and Communication Engineers, English

Incorporation of a Phebox Rhodium Complex into apo-Myoglobin Affords a Stable Organometallic Protein Showing Unprecedented Arrangement of the Complex in the Cavity
Yuh Satake, Satoshi Abe, Seiji Okazaki, Noritaka Ban, Tatsuo Hikage, Takafumi Ueno, Hiroshi Nakajima, Atsuo Suzuki, Takashi Yamane, Hisao Nishiyama, Yoshihito Watanabe, Organometallics, 26, 20, 4904, 4908, 21 Aug. 2007
Novel organometallic proteins have been synthesized as a 1:1 composite of rhodium 2,6-bis(2-oxazolinyl)phenyl (Rh·Phebox) complexes with the apo-form of myoglobin, which is an oxygen-transport protein having b-type heme (iron porphyrin IX) as a natural prosthetic group. The X-ray structural analysis reveals that the Rh·Phebox complex with phenyl substituents is included in the cavity with an almost perpendicular arrangement to that of the heme. The unique arrangement is supported by hydrogen bonding and a number of hydrophobic interactions, especially π−π interactions between the phenyl rings of the substituents and the imidazole moiety of His93, which is a ligand of the rhodium atom. Semiquantitative analysis of the composite stability by ESI mass spectroscopy clearly indicates that the stability of the composites depends on an extent of the interaction between the substituents of the Rh·Phebox complexes and His93. Enantioselectivity for the chiral (S,S)- and (R,R)-Rh·Phebox complexes with the phenyl sub..., American Chemical Society (ACS)

A Novel Assessment Methodology for the EMI Occurrence in Implantable Medical Devices Based Upon Magnetic Flux Distribution of RFID Reader/writers
Futatsumori, Shunichi, Hikage, Takashi, Nojima, Toshio, Koike, Ben, Fujimoto, Hiroshi, Toyoshima, Takeshi, EMC 2007 (IEEE International Symposium on Electromagnetic Compatibility, 2007), 1, 6, 09 Jul. 2007
EMC 2007 (IEEE International Symposium on Electromagnetic Compatibility, 2007). 9-13 July 2007. Honolulu, HI
With respect to the EMI affecting implantable medical devices caused by Radio Frequency Identification Reader/Writers (RFID R/W), experimental investigations are conducted to develop a risk assessment methodology based upon the measurement of the EMF distribution around RFID R/W. First, fundamental EMI occurrence mechanisms of implantablecardiac pacemakers and -cardioverter-defibrillators (ICD) are described. Secondly, the characteristics of the radio wave emitted by the RFID R/W are described. Next, EMI test experiments and measurements of the field distributions are performed. Then, a novel experimental assessment methodology is proposed. The EMI characteristics derived from magnetic flux distributions are compared with the experimental results to confirm the effectiveness of the proposed methodology. Finally, it is shown that the probability of EMI occurrence can be estimated using the statistical processing of the proposed methodology., English

Development of Lightweight Solid Phantom Composed of Silicone Rubber and Carbon Nanotubes
Takashi Hikage, Yuki Sakaguchi, Toshio Nojima, Yuji Koyamashita, 2007 IEEE International Symposium on Electromagnetic Compatibility, 1, 4, Jul. 2007
A lightweight human phantom material that has a specific gravity below 1.0 is newly developed and a full sized realistic shaped human phantom model is constructed using this material. Fundamental material composites are carbon nanotubes and silicone rubber. The carbon nanotubes enable this material to simulate various biological tissues with less specific gravity values than those of original ones. In addition, using the silicone rubber allows us to construct phantom models of various shapes. This paper describes the design principle and estimates the relation between complex permittivity and composition ratio of the material experimentally. Finally, a full sized realistic shaped human phantom model is constructed to show the features of the proposed material., IEEE

A Novel Microwave High-Temperature Superconducting Reaction-Type Transmitting Filter for Mobile Base Stations
Futatsumori, Shunichi, Hikage, Takashi, Nojima, Toshio, The sixth International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves and Workshop on Terahertz Technologies : symposium proceedings : MSMW '07, 1, 398, 400, 25 Jun. 2007
MSMW'07. (The Sixth International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves and Workshop on Terahertz Technologies, 2007). 25-30 June 2007. Kharkov
A novel split open-ring reaction-type construction technique to achieve high power-handling capability for High-temperature superconducting (HTS) filters is presented. The purpose of this filter is to suppress the adjacent noise generated by transmitting power amplifiers for mobile base stations. First, it is explained that reaction-type filters are suitable for high power transmission. Secondly, novel split open-ring resonators, which reduce the maximum current density while maintaining high Q-factors are proposed. Current density dispersion effects are evaluated under the same coupling coefficient. Finally, a 5 GHz three-pole reaction-type filter using split open-ring resonators is designed. The frequency characteristics of the filter are investigated by using the method of moments. The results predict that the filter realizes both a higher power-handling capability than that of transmission-type filters and a better skirt property than existing HTS filters using dual-mode resonators., English

Design and Structure Analysis of Artificial Metalloproteins:  Selective Coordination of His64 to Copper Complexes with Square-Planar Structure in the apo-Myoglobin Scaffold
Satoshi Abe, Takafumi Ueno, Pattubala A. N. Reddy, Seiji Okazaki, Tatsuo Hikage, Atsuo Suzuki, Takashi Yamane, Hiroshi Nakajima, Yoshihito Watanabe, Inorganic Chemistry, 46, 13, 5137, 5139, 25 May 2007
apo-Myoglobin (apo-Mb) was reconstituted with three copper complexes: CuII(Sal-Phe) (1; Sal-Phe = N-salicylidene-L-phenylalanato), CuII(Sal-Leu) (2; Sal-Leu = N-salicylidene-L-leucinato), and CuII(Sal-Ala) (3; Sal-Ala = N-salicylidene-L-alanato). The crystal structures of 1.apo-Mb (1.65 Angstrom resolution) and 2.apo-Mb (1.8 Angstrom resolution) show that the coordination geometry around the CuII atom in apo-Mb is distorted square-planar with tridentate Sal-X and a Nepsilon atom of His64 in the apo-Mb cavity and the plane of these copper complexes is perpendicular to that of heme. These results suggest that the apo-Mb cavity can hold metal complexes with various coordination geometries., American Chemical Society (ACS)

Structure and allele-specific expression variation of novel α/β hydrolase fold proteins in gentian plants
Takashi Hikage, Yasushi Saitoh, Claire Tanaka-Saito, Hisakazu Hagami, Fumi Satou, Yoshitaka Shimotai, Yuki Nakano, Miho Takahashi, Yoshihito Takahata, Ken-ichi Tsutsumi, Molecular Genetics and Genomics, 278, 1, 95, 104, 12 Apr. 2007
Previously, we identified two closely related proteins termed W14 and W15 that were enriched in the overwinter buds of the gentian plant Gentiana triflora. Expression of the latter protein W15 has been implicated in its association with cold hardiness, because of its absence in a cold-sensitive mutant. Here, we characterized these two proteins and the genes encoding them. Amino acid sequences of the W14 and W15 proteins showed difference at only three amino acid positions, and both of them showed homologies to alpha/beta hydrolase fold superfamily. Consistently, GST-fused W14 and W15 proteins expressed in bacteria showed hydrolase activity toward 1-naphtyl acetate. Structural analysis of these two genes in seven different gentian strains/cultivars including an anther culture-derived homozygous diploid revealed that W14 and W15 genes are allelic. Three genotypes were found; two strains carried both alleles (W14/W15), one carried the W15 genes in both alleles (W15/W15), and others were homozygous of W14 (W14/W14). Interestingly, expression of the two proteins exhibited allele-specificity. In one W14/W15 strain, expression of the W15 allele was almost repressed. In addition, organ specific expression of the alleles was observed in different cultivars. These observations were discussed in relation to winter hardiness of the gentian plants., Springer Science and Business Media LLC

B-4-13 Complex permittivity of lightweight solid phantom using carbon nanotube composite
Hikage Takashi, Sakaguchi Yuki, Nojima Toshio, Koyamashita Yuji, Proceedings of the IEICE General Conference, 2007, 1, 337, 07 Mar. 2007
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-7 Numerical Analysis of Incident Plane Wave Propagation in a Room with a Set of Furniture
Hasegawa Tomotsugu, Iwamoto Yoshinori, Omiya Manabu, Hikage Takashi, Proceedings of the IEICE General Conference, 2007, 1, 7, 07 Mar. 2007
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-24 SAR Calculation of a Realistic Human Model Due to RF Exposure From Mobile Phones in Elevators at 900, 1500 and 2000 MHz
SIMBA Ally Y., HIKAGE Takashi, WATANABE Soichi, NOJIMA Toshio, Proceedings of the IEICE General Conference, 2007, 1, 348, 07 Mar. 2007
The Institute of Electronics, Information and Communication Engineers, English

Research and development of lightweight solid human phantom model using Silicone Rubber
日景隆, 阪口友希, 野島俊雄, 小山下雄治, 電子情報通信学会技術研究報告, 106, 508(EMCJ2006 97-114), 2007

C-2-44 Nonlinear distortion measurements of High-Temperature Superconducting reaction-type resonators for transmitting filters
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori, Proceedings of the IEICE General Conference, 77, 2007
The Institute of Electronics, Information and Communication Engineers, Japanese

Estimation of electric field distribution in wireless office LANS using the FDTD method
Takashi Hikage, Toshio Nojima, Louis-Ray Harris, 2nd European Conference on Antennas and Propagation (EuCAP 2007), 224, 224, 01 Jan. 2007
The purpose of this study is to examine the Electric Field distribution in wireless office LAN environments. The model used for this study is a common office environment which has objects of varying physical and electrical properties such as desks, chairs and bookshelves, among others. (6 pages), Institution of Engineering and Technology

High-temperature superconducting reaction-type transmitting filter consisting of novel split open-ring resonators
Futatsumori, Shunichi, Hikage, Takashi, Nojima, Toshio, Proceedings of Asia-Pacific Microwave Conference 2006, 1284, 1287, 12 Dec. 2006
APMC 2006 (Asia-Pacific Microwave Conference, 2006). 12-15 Dec. 2006. Yokohama
High-temperature superconducting (HTS) reaction-type transmitting filter consisting of novel split open-ring resonators is presented. First, it is explained that reaction-type filters are suitable for high power transmission. Secondly, novel split open-ring resonators, which reduce the maximum current density while maintaining high Q-factors are proposed. Current density dispersion effects are evaluated under the same coupling coefficient. Finally, a three-pole reaction-type filter using split open-ring resonators is designed. The frequency characteristics and current distributions of the filter are investigated by the method of moments. The results predict that the filter realizes both a higher power-handling capability than transmission-type filters and a better skirt property than existing HTS dual-mode filters., English

An Experimental Assessment on Implantable Medical Devices EMI caused by Magnetic Flux Distributions of Low-band RFID reader/writers
Shunichi Futatsumori, Takashi Hikage, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima, IEICE Proceeding Series, 34, 1, 5, 02 Nov. 2006
Today, various kinds of wireless devices are being introduced into our daily lives. The assessment of electromagnetic interference (EMI) on implantable medical devices from these devices has great importance. We are conducting detailed experimental investigations for EMI on these medical devices due to Radio Frequency Identification reader/writers (RFID R/W). The final goal of this research project is to develop an EMI assessment method using numerical analysis. In addition, this project also aims at providing technical information to create RFID R/W with less effect. In this paper, we discuss about the methodology for implantable cardiac pacemakers and implantable cardiac-defibrillators EMI assessment based on magnetic flux distributions generated by low-band RFID R/W. First, fundamental EMI occurrence mechanisms of pacemakers and ICDs are described. Secondly, specifications for low-band RFID R/W are mentioned from magnetic flux application standpoint. Next, EMI test experiments and measurements of the field distributions are described. Finally, EMI characteristics derived from magnetic flux distributions are compared with the experiment results to confirm the effectiveness of the proposed methodology., The Institute of Electronics, Information and Communication Engineers, English

Estimation of the EMF excitation by cellular radios in actual train carriages - with and without passenger
Soichi Watanabe, Manabu Omiya, Takashi Hikage, Y. Abiko, M. Hirono, Toshio Nojima, Takashi Shinozuka, 2005 International Symposium on Electromagnetic Compatibility, 2005. EMC 2005., 2, 628, 631, 04 Oct. 2006
Precise computer simulations using 800 MHz and 2 GHz transmitters in an actual train carriage are conducted on the electromagnetic field (EMF) distributions excited inside train carriages. With regard to the EMC of the portable radio terminals such as cellular phones and data communication transceivers that transmit RF waves, one of the most important and substantial issues is to prevent the occurrence of unwanted effects on the human health due to the RF exposure from such radio devices (1997) (Kramer et al., 2002). Since the portable radios may be used in various environments, accurate and reliable estimations of EMC in practical environments are required. However, the measurements in the actual environment need enormous costs and it is also difficult to carry out precisely. In this paper, we carry out the precise numerical simulations to examine the EMF actual environment. A simplified histogram estimation method for electric field strength is developed to deal with the complicated EMF distributions. Typical results of FDTD analysis and actual measurement data are then shown. Finally, considerations and conclusions are made, IEEE

C-2-63 S-parameters estimation of 5GHz superconducting reaction-type transmitting filter using split openring resonators
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, KURIHARA Kazuaki, YAMANAKA Kazunori, Proceedings of the Society Conference of IEICE, 2006, 1, 82, 07 Sep. 2006
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-47 Indoor Propagation of Incident Plane Waves by Numerical Analysis
Iwamoto Yoshinori, Hasegawa Tomotsugu, Omiya Manabu, Hikage Takashi, Proceedings of the Society Conference of IEICE, 2006, 1, 47, 07 Sep. 2006
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-48 Highly Precise Analysis of Electromagnetic Field Distributions in a Route Bus
Hasegawa Tomotsugu, Omiya Manabu, Hikage Takashi, Proceedings of the Society Conference of IEICE, 2006, 1, 48, 07 Sep. 2006
The Institute of Electronics, Information and Communication Engineers, Japanese

B-4-17 Experimental test system to estimate the EMI from RFID reader/writer on implantable cardiac pacemaker
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, KOIKE Ben, Fujimoto Hiroshi, TOYOSHIMA Takeshi, Proceedings of the IEICE General Conference, 2006, 1, 312, 08 Mar. 2006
The Institute of Electronics, Information and Communication Engineers, Japanese

C-2-38 Numerical analysis of the current density distribution in the High-Temperature Superconductor split open-ring resonator
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the IEICE General Conference, 2006, 1, 69, 08 Mar. 2006
The Institute of Electronics, Information and Communication Engineers, Japanese

Antiproliferative Activity of Root Extract from Gentian Plant (Gentiana triflora) on Cultured and Implanted Tumor Cells
MATSUKAWA Kazushige, OGATA Mika, HIKAGE Takashi, MINAMI Hiroyuki, SHIMOTAI Yoshitaka, SAITOH Yasushi, YAMASHITA Tetsuro, OUCHI Atsushi, TSUTSUMI Reiko, FUJIOKA Tomoaki, TSUTSUMI Ken-ichi, Bioscience, Biotechnology, and Biochemistry, 70, 4, 1046, 1048, 2006
We describe a novel pharmacological activity of the gentian root, an ingredient of Chinese medicines. Root extract from Gentiana triflora triggered cell death of human Daudi cells in culture. In addition, daily administration of the extract to mice inhibited growth of implanted solid tumors. Extract treatment of cultured cells resulted in the appearance of shranken, fragmented, or condensed cell and nuclear morphologies, and in chromosomal DNA degradation. But, the extract-treated cells did not show DNA fragmentation, which exhibits a nucleosome ladder, suggesting that extract-triggered cell death is not mediated through a typical apoptotic pathway., Japan Society for Bioscience, Biotechnology, and Agrochemistry, English

Stress-Related Proteins Are Specifically Expressed under Non-Stress Conditions in the Overwinter Buds of the Gentian Plant Gentiana triflora
Takahashi Miho, Hikage Takashi, Yamashita Tetsuro, Saitoh Yasushi, Endou Motonobu, Tsutsumi Ken-ichi, Breeding Science, 56, 1, 39, 46, 2006
The overwinter bud of the gentian plant, Gentiana triflora, is an organ that develops from the basal tuber in late spring and becomes dormant and freezing-tolerant for overwintering. Here, proteins specifically enriched in the overwinter buds were identified using two-dimensional polyacrylamide gel electrophoresis followed by amino acid sequencing. Enriched proteins included those so far identified as stress- and cold-inducible in other plants, i.e., two isoforms of ethylene-induced esterase, a dehydration-induced protein, glyoxalase I, thioredoxin peroxidase, two isoforms of ascorbate peroxidase and a membrane pore protein. Interestingly, the stress-related proteins had already accumulated in the overwinter buds under non-stress conditions in early summer. Accumulation of these proteins was also examined in a mutant gentian, which developed overwinter buds but lacked cold tolerance and died under conditions below 3°C. In this mutant, several proteins including one of the putative esterase, enolase and ascorbate peroxidase were absent or greatly decreased. Thus, it appears that these stress-related proteins are expressed under non-stress conditions to aquire cold tolerance before overwintering.
, Japanese Society of Breeding, English

Exporting cut flowers of gentian under world wide brand name of "Ashiro Gentiana"
HIKAGE Takashi, 農林水産技術研究ジャーナル = Research Journal of Food and Agriculture, 29, 1, 25, 26, 01 Jan. 2006
Japanese

EMF Excitation Dependency on the Boundary Condition Due to Mobile Radios - Parallel FDTD Analysis on the Radio Environment in a Train Carriage -
Yusuke Kawahara, Taichi Kono, Yuki Sumi, Takashi Hikage, Toshio Nojima, Manabu Omiya, Soichi Watanabe, Takashi Shinozuka, IEICE Proceeding Series, 33, 3E2-4, 03 Nov. 2005
The Institute of Electronics, Information and Communication Engineers, English

Loss reduction of photonic crystal waveguide fabricated by the autocloning technology
Kenta Miura, Yasuo Ohtera, Hiroyuki Ohkubo, Takashi Sato, Naoto Akutsu, Masahiro Hikage, Naoto Ishino, Takayuki Kawashima, Shojiro Kawakami, Electronics and Communications in Japan (Part II: Electronics), 88, 11, 10, 20, 11 Oct. 2005
AbstractThe heterostructured photonic crystal waveguide fabricated by the autocloning technology allows fabrication jointly with other functional devices. Hence, this approach is useful for elemental components for the next‐generation high‐function planar optical circuits. When this waveguide is used for interconnection of optical circuits, its propagation loss should be as small as possible. In this investigation, Ta2O5/SiO2 is selected as the construction material. Further, by using a waveguide configuration minimizing the scattering loss, substantial loss reduction was achieved. It is especially effective to use a simple flat multilayered film structure. A loss reduction up to a propagation loss of 0.1 dB/mm was realized. The present waveguide has a small coupling loss of 0.43 dB with an existing optical fiber (a high‐Δ fiber with a mode field diameter of 2.7 µm) and hence is easily adapted to the optical communication system. The heterostructured photonic crystal waveguide is thus extremely practical. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 88(11): 10–20, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20195, Wiley

B-4-9 FDTD Analysis for Propagation Characteristics of Wireless LAN equipped in a Jumbo Jet
KAWAHARA Yusuke, KONO Taichi, SUMI Yuki, HIKAGE Takashi, NOJIMA Toshio, OMIYA Manabu, Proceedings of the Society Conference of IEICE, 2005, 1, 333, 07 Sep. 2005
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-126 Analysis of Meander Line Antenna with Ground plane
KONO Taichi, KAWAHARA Yusuke, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the Society Conference of IEICE, 2005, 1, 126, 07 Sep. 2005
The Institute of Electronics, Information and Communication Engineers, Japanese

C-2-63 Power handling capability improvement of the microwave High-Temperature Superconductor Reaction filter
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the Society Conference of IEICE, 2005, 1, 84, 07 Sep. 2005
The Institute of Electronics, Information and Communication Engineers, Japanese

C-1-6 Considerations on Distributions of Electromagnetic Field Due to a Cell Phone in a City Bus
HASEGAWA Tomotsugu, OMIYA Manabu, HIKAGE Takashi, Proceedings of the Society Conference of IEICE, 2005, 1, 6, 07 Sep. 2005
The Institute of Electronics, Information and Communication Engineers, Japanese

A case of fibrous pseudotumor originating from tunica vaginalis testis
Kato, Tomonori, Takano, Makoto, Mizoguchi, Ken-ichi, Ikeda, Ryoichi, Nakamura, Takeshi, Akakura, Koichiro, Hikage, Takashi, Inoue, Tohru, Acta urologica Japonica, 51, 7, 483, 486, Jul. 2005
A 32-year-old man presented with a complaint of painless palpable mass of the left scrotal content. Based on the preoperative diagnosis of scrotal or spermatic cordal benign tumor, local excision was performed. The histological diagnosis was scrotal fibrous pseudotumor. In Japan, only 35 cases of fibrous pseudotumor of the scrotum have been reported including our case. Orchiectomy was performed in 15 cases. Fibrous pseudotumor is a benign fibroproliferative lesion with dense hyalinization and sometimes focal calcification. It may be induced by previous intrascrotal inflammatory events such as epididymitis, an infected hydrocele, prior surgery or trauma. Although a relatively rare disease, a fibrous pseudotumor should be considered in the differential diagnosis of testicular and testicular tunica tumors. Our case was of a benign pseudotumor and orchiectomy could have been avoided., 泌尿器科紀要刊行会, English

B-4-4 FDTD analysis of RF propagations in a semi-echoic environment
HIKAGE Takashi, SUMI Yuki, NOJIMA Toshio, OMIYA Manabu, Proceedings of the IEICE General Conference, 2005, 1, 365, 07 Mar. 2005
The Institute of Electronics, Information and Communication Engineers, Japanese

C-2-91 An investigation for the microwave High-Temperature Superconductor reaction filter
Futatsumori Shunichi, Hikage Takashi, Nojima Toshio, Proceedings of the IEICE General Conference, 124, 2005
The Institute of Electronics, Information and Communication Engineers, Japanese

Urethral leiomyoma expressing estrogen receptors
KATO TOMONORI, KOBAYASHI TAKASHI, IKEDA RYOICHI, NAKAMURA TAKESHI, AKAKURA KOICHIRO, HIKAGE TAKASHI, INOUE TOHRU, 11, 7, 573, 575, 01 Jul. 2004
English

Primary adrenal leiomyosarcoma with inferior vena cava thrombosis
KATO Tomonori, SAKAMOTO Shinichi, KOBAYASHI Takashi, IKEDA Ryoichi, NAKAMURA Takeshi, AKAKURA Koichiro, HIKAGE Takashi, INOUE Tohru, Int. J. Clin. Oncol., 9, 3, 189, 192, Jun. 2004
Springer Science and Business Media LLC, English

B-4-4 Preliminary Experiments about the microwave exposure effect on the biological Free-Radical excitation
MANABE Takeaki, HIKAGE Takashi, NOJIMA Toshio, Proceedings of the IEICE General Conference, 2004, 1, 371, 08 Mar. 2004
The Institute of Electronics, Information and Communication Engineers, Japanese

Circular Polarized Array antenna using Cavity-Backed Slot Antenna for Microwave Energy Transmission at 5.8 GHz
HIKAGE Takashi, IZAWA Yoshinori, NOJIMA Toshio, OMIYA Manabu, ITOH Kiyohiko, Proceedings of the Society Conference of IEICE, 2003, 1, 208, 10 Sep. 2003
The Institute of Electronics, Information and Communication Engineers, Japanese

A Study on Mutual Coupling in Cavity-Backed Slot Antenna Array Consisting of Parallel Plates and Posts which is Excited by an Inverted-F Element
HIKAGE Takashi, MUNAKATA Kosuke, NOJIMA Toshio, OMIYA Manabu, ITOH Kiyohiko, Proceedings of the IEICE General Conference, 2003, 1, 165, 03 Mar. 2003
The Institute of Electronics, Information and Communication Engineers, Japanese

FDTD ANALYSIS OF A LARGE SCALE ENERGY TRANSMISSION ARRAY ANTENNA
Takashi Hikage, Toshio Nojima, Manabu Omiya, Kiyohiko Itoh, IEICE Proceeding Series, 10, POS5-3, 26 Nov. 2002
The Institute of Electronics, Information and Communication Engineers, English

Slot antenna consisted of two conductive plates and thin wires
K. Murakami, Manabu Omiya, Kiyohiko Itoh, Takashi Hikage, IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229), 3, 545, 548, 13 Nov. 2002
The solar power satellite (SPS) was proposed as a sustainable and reusable energy source for mankind in future. This paper discusses a design method of antenna elements whose conductive sidewalls in the conventional model are replaced by thin wires. Such a new configuration makes it easy to produce low profile antenna elements as well as array antennas. Relations between the wire intervals and input characteristics are clarified. It is shown from the study that the method is also available to design the new type of antenna element. This paper describes the geometries of a conventional and a new type of cavity-backed slot antenna, and shows the antenna parameters that realize the impedance matching by using the proposed method. The effectiveness of the design is clarified from computed results. Moreover, the mutual coupling of a nine-element array antenna is considered., IEEE

Performance evaluation of cavity-backed slot antennas using the FDTD technique
Manabu Omiya, Takashi Hikage, Kiyohiko Itoh, IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.00CH37118), 3, 1484, 1487, 07 Nov. 2002
This paper proposed feed models appropriate for the FDTD evaluation of the input characteristics of the cavity-backed slot antenna. By employing the coaxial model and the gap voltage model, we showed the coaxial model effectively reduced the amount of time steps and did not require the time window function to estimate experimental results of the input characteristics. Compared with the gap voltage model, the coaxial model gives a good estimation of the input impedance by only 3000 time steps. On the other hand, the gap voltage model and time windows required 32768 or 20000 time steps for the accurate estimation. It is concluded that the coaxial model requires only 9 % or 15 % of the time steps required for the gap voltage model. As a result, we concluded the coaxial model is effective for the FDTD analysis of the cavity-backed slot antenna. This technique is easily applicable to the evaluation of mutual coupling and beam steering performance of phased array antennas., IEEE

14. Cryopreservation of In Vitro-Grown Plant Apical Shoot Tips by Vitrification and Encapsulation-Vitrification(the 48th Annual Meeting)
TANAKA Daisuke, NIINO Takao, ISUZUGAWA Kanji, HIKAGE Takashi, UEMURA Matsuo, Cryobiology and Cryotechnology, 48, 2, 135, 138, 2002
In vitro-grown apical shoot tips of Gentiana were successfully cryopreserved by vitrification (V) and encapsulation-vitrification (EV) protocols. We optimized and compared the V and EV protocols. Although both protocols resulted in a relatively high survival rate, the EV protocol seemed to have several distinct advantages. First, the survival rate of shoot tips cryopreserved by the EV protocol was much greater than that by the V protocol under optimized conditions. Second, the range of optimum treatment period by vitrification solution (PVS2 solution) was considerably wider with the EV protocol than with the V protocol. Third, after rewarming from liquid nitrogen temperature, the cryopreserved shoot tips showed more vigorous growth for the EV protocol than the V protocol. With the optimum EV protocol, we succeeded to cryopreserve shoot tips from 10 different lines of Gentiana and uniformly obtained high survival rate. Thus, the EV protocol appears to be promising for cryopreservation of a wide range of plant germplasm., Japanese Society of Cryobiology and Cryotechnology, Japanese

Cavity-Backed Slot Antennas with Sidewalls Consisting of Posts and Feeder of an Inverted-F Element for Wireless Energy Transmission
MUNAKATA Kosuke, HIKAGE Takashi, OMIYA Manabu, ITE Technical Report, 26.52, 17, 20, 2002
The cavity-backed slot antenna is used as an element for the solar power satellite SPS2000. The antenna element is superior to others in mechanical strength and heat dissipation, and it tends to be a low profile structure. The authors have already proposed the cavity-backed slot antenna whose sidewalls consist of conductive posts. In this paper, we propose design methods of cavity-backed slot antenna with the posts, which are fed by an inverted-F element. Then, antenna parameters realizing the good impedance matching at the frequency of 2.45 GHz are derived. The effectiveness of the design method and antenna parameters is verified by experiments., The Institute of Image Information and Television Engineers, Japanese

Slot Antenna Consisting of Two Parallel Conductive Plates and Cylindrical Posts
Hikage Takashi, Murakami Kazuyuki, Omiya Manabu, Itoh Kiyohiko, Proceedings of the Society Conference of IEICE, 2001, 1, 159, 29 Aug. 2001
The Institute of Electronics, Information and Communication Engineers, Japanese

Cavity-Backed Slot Antenna with Sidewalls Consisted of Thin Wires for Microwave Energy Transmission
HIKAGE Takashi, MURAKAMI Kazuyuki, OMIYA Manabu, ITOH Kiyohiko, Proceedings of the IEICE General Conference, 94, 2001
The Institute of Electronics, Information and Communication Engineers, Japanese

Design of Cavity-Backed Slot Antennas excited by a Loop Element
HIKAGE Takashi, IMADA Mizuki, OMIYA Manabu, ITOH Kiyohiko, Proceedings of the Society Conference of IEICE, 2000, 1, 58, 07 Sep. 2000
The Institute of Electronics, Information and Communication Engineers, Japanese

The structure and function of the catalytic domain of a cell wall hydrolase, N-acetylmuramoyl-L-alanine amidase.
Yamane,Takashi, Koyama,Yasuhiro, Hikage,Tatsuo, Akita,Masatake, Suzuki,Atsuo, Ise,Fuminori, Shida,Toshio, Sekiguchi,Junichi, 日本生物工学会大会講演要旨集, 平成12年度, 72, 10 Jul. 2000
日本生物工学会, Japanese

Evaluation of Mutual Coupling of Low-Profile Cavity-Backed Slot Antennas
HIKAGE Takashi, MURAKAMI Kazuyuki, OMIYA Manabu, ITOH Kiyohiko, Proceedings of the IEICE General Conference, 113, 2000
The Institute of Electronics, Information and Communication Engineers, Japanese

Design of Cavity-Backed Slot Antenna with Side Walls of Wire
OMIYA Manabu, HIKAGE Takashi, IMADA Mizuki, ITOH Kiyohiko, Proceedings of the Society Conference of IEICE, 97, 1999
The Institute of Electronics, Information and Communication Engineers, Japanese

B-1-92 Design Method of a Low-Profile Cavity-Backed Slot Antenna
OMIYA Manabu, HIKAGE Takashi, IMADA Mizuki, ITOH Kiyohiko, Proceedings of the IEICE General Conference, 92, 1999
The Institute of Electronics, Information and Communication Engineers, Japanese

Considerations on Evaluation of Mutual Coupling of Cavity-Backed Slot Antenna Using the FDTD Technique
HIKAGE Takashi, OMIYA Manabu, ITOH Kiyohiko, Proceedings of the Society Conference of IEICE, 96, 1999
The Institute of Electronics, Information and Communication Engineers, Japanese

Considerations on Design of Low-Profile Cavity-Backed Slot Antennas
HIKAGE Takashi, OMIYA Manabu, ITOH Kiyohiko, IEICE technical report. Microwaves, 98, 198, 7, 14, 24 Jul. 1998
We have developed antenna elements for the spacetenna of the solar power satellite in Japan, SPS2000. The cavity-backed slot antenna is used as an element of spacetenna to transmit the microwave power at the frequency of 2.45 GHz. We propose a mthod by which low-profile cavity-backed slot antennas are designed. An impedance mathcing at the frequency of 2.45 GHz is obtained for the proper location of the feeding probe and the slot dimension in the antenna geometry. Furthermore we show antenna parameters which realize the impedance matching. The finite-difference time-domain technique is employed to analyze antenna characteristics. Good agreement between the calculation results and experimental measurements for elements with the cavity of less than 12mm high demonstrates the effectriveness of the proposed design method., The Institute of Electronics, Information and Communication Engineers, Japanese

FDTD Analysis on Beam Steering Performance of Phased Array Antenna
HIKAGE Takashi, OMIYA Manabu, FUKUCHI Hisanao, ITOH Kiyohiko, Proceedings of the IEICE General Conference, 1998, 1, 185, 06 Mar. 1998
The Institute of Electronics, Information and Communication Engineers, Japanese

FDTD Simulations of Mutual Coupling of an Antenna Array
HIKAGE Takashi, OMIYA Manabu, ITOH Kiyohiko, Proceedings of the Society Conference of IEICE, 89, 1998
The Institute of Electronics, Information and Communication Engineers, Japanese

FDTD Analysis of a Cavity-Backed Slot Antenna
OMIYA Manabu, HIKAGE Takashi, ITOH Kiyohiko, Proceedings of the Society Conference of IEICE, 1997, 1, 124, 13 Aug. 1997
太陽発電衛星SPS2000では送電アンテナ素子としてキャビティ付スロットアンテナの利用が検討されている. 本研究グループではアンテナ素子の設計にFDTD法を適用することを提案している. 本稿では, 同軸線路を接続したアンテナ素子のFDTD解析結果について議論する., The Institute of Electronics, Information and Communication Engineers, Japanese

Cavity-Backed Slot Antennas for the Microwave Energy Transmission
HIKAGE Takashi, OHNO Norio, OMIYA Manabu, ITOH Kiyohiko, IEICE technical report. Antennas and propagation, 97, 146, 57, 64, 03 Jul. 1997
We have developed antenna elements for the spacetenna of SPS2000. SPS2000 is the nickname of the strawman model of the solar power satellite in Japan. First it is shown that a cavity-backed slot antenna is one of the most suitable antenna elements by showing the configuration of an antenna whose dimension prevents glating lobes in radiation patterns at the beam steering. We also design a cavity-backed slot antenna whose dimensions are defined in the conceptual study of SPS2000. In this paper we propose two kinds of antenna element, which are fed by a shorted probe and an inverted-F type feeder, and show design methods of the feeders using FDTD analyses and measurements., The Institute of Electronics, Information and Communication Engineers, Japanese

A Study of Activity on Markets in Otaru Part 1
HORIUCHI Yoshiaki, SUMITANI Hiroshi, SATO Takashi, HIKAGE Toshiya, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. F, Urban planning, building economics and housing problems, history and theory of architecture, 1994, 167, 168, 25 Jul. 1994
Architectural Institute of Japan, Japanese

A Study of Activity on Markets in Otaru Part 2
HIKAGE Toshiya, SUMIYA Hiroshi, SATO Takashi, HORIUCHI Yoshiaki, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. F, Urban planning, building economics and housing problems, history and theory of architecture, 1994, 169, 170, 25 Jul. 1994
Architectural Institute of Japan, Japanese

The Basic Test and Error Analysis
Takashi Nara, Toshio Hikage, The journal of Morioka University, 12, 12, 1, 20, 15 Mar. 1993
Japanese

An adaptive equalizing maximum likelihood decoding LSI for magnetic recording systems
S. Tanaka, H. Kojima, Y. Okada, F. Nakazawa, T. Hikage, H. Matsushige, M. Kosuge, H. Miyasaka, T. Takashi, S. Hanamura, 1993 IEEE International Solid-State Circuits Conference Digest of Technical Papers, 220, 221, 1993
IEEE

Thermal-deformable polyanion/polypyrrole conductive composite membranes.
WERNET W, 大和真樹, 山戸斉, 甲斐健一郎, 竹下公也, 朝倉敏景, 小柴隆史, ポリマー材料フォーラム講演要旨集, 1st, 1992

Expression of C-ERBB-2 Gene Product in Urinary Bladder Cancer
Takashi Hikage, Shigeo Mori, Kazunari Sato, Masatsugu Moriyama, Noriko Katsuta, Tetsuro Kato, Tomoyuki Kawamoto, Tadashi Yamamoto, Tetsu Akiyama, Tsutomu Watanuki, Journal of Urology, 145, 423, 427, 01 Feb. 1991
Expression of the c-erbB-2 gene product and the epidermal growth factor receptor (EGF-R) was investigated in 54 cases of human bladder cancer immunohistologically and by Western blot analysis. For detection of the c-erbB-2 product, two specific antibodies, a rabbit polyclonal antibody directed to the intracellular domain and a murine monoclonal antibody recognizing an epitope in the extracellular domain, were used. Seventeen cases of bladder cancer were stained by the anti-c-erbB-2 polyclonal antibody, while 20 cases were stained by the monoclonal antibody, with good correlation on both stainings (p less than 0.01). There were four c-erbB-2 positive cases in 26 G1 tumors, four in 15 G2 tumors, and nine in 13 G3 tumors. There were also eight erbB-2 positive cases in nine muscle-invasive tumors, nine of 45 superficial tumors, four of five with lymph node metastasis, and seven of 14 without metastasis, as revealed by staining with the polyclonal antibody. Thus, the c-erbB-2 gene product was more frequently expressed in high grade tumors (p less than 0.01), in high stage tumors (p less than 0.01), and nodal metastatic tumors (N.S. by Chi-square test). Twenty-two of the 54 tumors were stained by an anti-EGF-R monoclonal antibody, 528 IgG. The expression of EGF-R was independent of histological grading, tumor stage, and nodal status, and no correlation was observed between expression of the c-erbB-2 product and EGF-R. The c-erbB-2 product may be applicable as a tumor marker for evaluation of malignant potential, invasiveness, and probably metastatic potential of human bladder cancer., Ovid Technologies (Wolters Kluwer Health)

Elevated Expression of P-Glycoprotein in Kidney and Urinary Bladder Cancers.
MORIYAMA MASATSUGU, SUGAWARA ISAMU, HAMADA HIROFUMI, TSURUO TAKASHI, KATO TETSURO, SATO KAZUNARI, HIKAGE TAKASHI, WATANUKI TSUTOMU, MORI SHIGEO, The Tohoku Journal of Experimental Medicine, 164, 3, 191, 201, 1991
MORIYAMA, M., SUGAWARA, I., HAMADA, H., TSURUO, T., KATO, T., SATO, K., HIKAGE, T., WATANUKI, T. and MORI, S. Elevated Expression of P-Glycoprotein in Kidney and Urinary Bladder Cancers. Tohoku J. Exp. Med., 1991, 164 (3), 191-201 - A monoclonal antibody MRK16, recognizing specifically an epitope of P-glycoprotein (P-GP), a highly active efflux transporter of chemotherapeutic agents, was used to determine the degree of expression of P-GP in the normal human kidney and urinary bladder, and in kidney and urinary bladder cancers. P-glycoprotein was localized in the microvilli of the epithelial cells of the proximal renal tubules by immunoelectron microscopy, and detected immunohistochemiccally in 6 of 20 untreated kidney cancers and 11 of 31 untreated urinary bladder cancers. Some of the cancerous tissues were further examined with regard to P-GP expression by immunoprecipitation. In urinary bladder cancers, the degree of P-GP expression seemed to be somewhat correlated with tumor grading. These results indicate that our method to detect the degree of expression of P-GP by MRK16 may be applicable for the diagnosis of clinical multidrug resistant urinary cancers., Tohoku University Medical Press, English

Toxic Activities of the Ga-Sn Alloy (Adlloy-OH) on Nutritional Condition and Dental Caries Development in Rats
MATSUI Satoko, SARUTA Takashi, MATSUMOTO Yoshito, HIKAGE Sakari, NAKADE Osamu, KAKU Tohru, ENDO Kazuhiko, SAGARA Masahiro, OHNO Hiroki, Higashi Nippon dental journal, 9, 2, 113, 119, 30 Dec. 1990
The toxic activities of Ga〜Sn alloy (Adlloy-OH) in experimental rats, its relations to the nutritional condition and dental caries development, were studied for three months. Adlloy, 0.3g or 3g per body weight (kg), was fed orally with the basal diet consisting of casein, sucrose, bean oil, mineral, and vitamin mixtures. Biochemical assays of serum was carried out for total protein, albumin, calcium, inorganic phosphate, glucose, urea, creatine, alkaline phosphatase, GOT, and GPT. There was no convicing evidence of toxic effects on growth and biochemical data by the oral feeding of Addloy-OH., Health Sciences University of Hokkaido, Japanese

Recurrence of upper urinary tract calculi
MITSUHASHI, Shinichi, HIKAGE, Takashi, KAWAMURA, Kenji, MASUKAGAMI, Toshikiyo, MATSUZAKI, Akira, Acta urologica Japonica, 34, 9, 1549, 1555, Sep. 1988
Treatment of upper urinary tract stones has changed greatly. The recurrence of calculi after the discharge was studied in the 634 patients with urolithiasis admitted to our department during the 9 years up to the end of 1984. The recurrence rate in the 325 cases followed for more than 3 months after the disappearance of the original stones, was 15.6% after 2 years, 27.6% after 5 year and 51.4% after 8 years. In recurrent stone formers, the rate of recurrence thereafter was greater than that of primary stone formers. The growth of calculi was rapid in the renal stone former concomitant with urinary tract infection together with a past history of renal surgery. In relation to the composition of the stone, uric acid calculi tended to recur more often than calculi composed of other substances. In view of recurrence, pyelolithotomy is preferred to renal parenchymal incision., 泌尿器科紀要刊行会, Japanese

Two cases of synchronous bilateral renal tumors
KAWAMURA, Kenji, HIKAGE, Takashi, MASUKAGAMI, Toshikiyo, MATSUZAKI, Akira, MITSUHASHI, Shinichi, Acta urologica Japonica, 33, 11, 1862, 1866, Nov. 1987
Case 1: A 56-year-old man visited us complaining of gross hematuria. Because of his refusal to undergo a surgical operation, we performed embolization and chemotherapy, which were ineffective and he died of cancerous cachexia. Case 2: A 59-year-old female with microscopic hematuria was referred to our clinic. Left partial nephrectomy and right radical nephrectomy were done in a two-stage operation at a 3 month interval. She is now well without sign of recurrence at 9 months after the last operation., 泌尿器科紀要刊行会, Japanese

CLINICAL STUDY OF BRL 28500 (CLAVULANIC ACIDTICARCILLIN) IN CHRONIC COMPLICATED URINARY TRACT INFECTIONS
HIKAGE TAKASHI, MITSUHASHI SHINICHI, MASUKAGAMI TOSHIKIYO, CHEMOTHERAPY, 34, Supplement4, 890, 896, 1986
BRL 28500, a formulation containing 15 parts of ticarcillin and 1 part of clavulanic acid, was administered to nine patients diagnosed as suffering from chronic complicated urinary tract infections. All nine cases recived BRL 28500 1.6 g×2/day by drip infusion for 5 days.
Clinical effects were excellent in one, moderate in four and poor in four cases. The overall effectiveness rate was thus 55.6%. Bacteriologically, out of a total of 16 strains, 13 strains (81.3%) were eradicated.
Neither subjective adverse reaction nor abnormal laboratory finding related to the drug was observed., Japanese Society of Chemotherapy

CLINICAL STUDY OF HAPA-B ON CHRONIC COMPLICATED URINARY TRACT INFECTIONS
MITSUHASHI SHIN-ICHI, HIKAGE TAKASHI, MASUKAGAMI TOSHIKIYO, CHEMOTHERAPY, 33, Supplement5, 485, 490, 1985
HAPA-B, a new aminoglycoside analogue, was administered to 10 cases diagnosed as chronic complicated urinary tract infections. All cases received intramuscular injection of HAPA-B at a dosage of 100-200 mg×2/day for 5 days. Overall clinical efficacies according to the criteria of Japanese UTI Committee was 30%. Overall bacteriological eradication rate obtained was 50% out of 16 strains isolated, and also the rate of P. aeruginosa was 50%.
The administration of the drug to azotemic patient should be avoided., Japanese Society of Chemotherapy

CLINICAL EXPERIENCE WITH IMIPENEM/CILASTATIN SODIUM IN CHRONIC COMPLICATED LOWER URINARY TRACT INFECTIONS
MITSJHASHI SHINICHI, HIKAGE TAKASHI, MASUKAGAMI TOSHIKIYO, CHEMOTHERAPY, 33, Supplement4, 771, 777, 1985
A clinical study of imipenem/cilastatin sodium (MK-0787/MK-0791) was carried out in 12 males with chronic complicated lower urinary tract, infections. The drug was administered by intravenous dripinfusion of 250/250mg or 500/500mg twice daily for-consecutive 5 days. The overall clinical efficacy evaluated on the basis of the Criteria of the UTI Committee in Japan was 50.0%. MK-0787/MK-0791 treatment eradicated the majority /of bacteria and the eradication rate was 84.6%. Strains appearing after treatment were Gram-positive cocci. No side effect was observed., Japanese Society of Chemotherapy

CLINICAL STUDY OF AC-1370 ON CHRONIC COMPLICATED URINARY TRACT INFECTION
MITSUHASHI SHIN-ICHI, HIKAGE TAKASHI, CHEMOTHERAPY, 32, Supplement9, 623, 629, 1984
AC-1370, a new cephem analogue, was administered to 10 cases diagnosed as chronic complicated urinary tract infections. All cases except two 0.5 g×2/day received drip infusion of 1 g × 2/day for 5 days. Overall clinical efficacies were good in 4 (40%) and poor in 6 patients (60%). Eradication rate was 46.7% and yet all of two rods of P. aeruginosa persisted. These poor results were caused mainly high MIC levels of bacteria.
In above mentioned 10 cases, serious side effects were not observed. However, we have experienced ashock in another case in his first administration., Japanese Society of Chemotherapy

THERAPEUTIC RESULTS WITH KW-1070 IN COMPLICATED URINARY TRACT INFECTIONS
MITSUHASHI SHINICHI, HIKAGE TAKASHI, KUMAGAI AKIRA, CHEMOTHERAPY, 29, Supplement2, 472, 478, 1981
A clinical trials of KW-1070, a new injectable aminoglycoside derivative, was conducted to assess its effectiveness and safety in the treatment of urinary tract infection. Eleven patients with chronic complicated cystitis, one inoperable advanced vesical carcinoma and the another operated vesical cancer (segmental cystectomy) received intramuscularly the drug 100-300mg twice daily for 5 days. By the criteria for drug efficacy evaluation in urinary tract infections, the theraputic response was excellent in 1, good in 4, and poor in 8, hence an overall clinical effectiveness rate 38.5%. Either subjective or objective adverse reactions were observed in any of the patients treated., Japanese Society of Chemotherapy

Measurement of androgen receptor in cytosols from normal, benign hypertrophic and cancerous human prostates.
SHIMAZAKI JUN, HIKAGE TAKASHI, SATO RYOKO, KODAMA TAKAOMI, ITO HARUO, Endocrinologia Japonica, 28, 6, 725, 734, 1981
The binding of R 1881 in cytosols from the normal, benign hypertrophic and cancerous human prostates was examined in the presence of molybdate and triamcinolone acetonide. The addition of 10mM Na₂MoO₄ resulted in an increase in the stability of the binder without any change in Kd. Triamcinolone acetonide added to the incubation of cytosol with R 1881 modified the inhibition pattern by other steroids, and the binding in the presence of triamcinolone acetonide exhibited the characteristics of androgen receptor. The complex of cytosol and R 1881 formed in the incubation in the presence of triamcinolone acetonide was sedimented at 8.5S.
Kd of the binding to R 1881 of the normal and pathological prostates was almost identical, but maximum binding sites of the androgen receptor were larger in benign hypertrophic and cancerous prostates than in normal tissues. For the assay of binding capacity in needle biopsy specimens, one point determinations were performed using 2.5nM R 1881 as the ligand. The number of binding sites obtained by this method were well correlated with those obtained by the Scatchard plot in various prostatic tissues., The Japan Endocrine Society, English

CLINICAL EXPERIENCE OF CEFROXADINE (CGP-9000)
MITSUHASHI SHIN-ICHI, HIKAGE TAKASHI, KUMAGAI AKIRA, CHEMOTHERAPY, 28, Supplement3, 370, 374, 1980
The efficacy of Cefroxadine (CGP-9000, CXD) in 20 female adults with acute simple cystitis was studied at an oral dose of 250mg b. i. d. for 3 days.
Micturition pain and pollakiuria disappeared in all cases, with the majority of cases being resolved with only a single dose.
Pyuria was cleared in 17 cases and decreased in 1 case although it was indeterminable in 2 cases.
Bacteriuria was eliminated in 2 cases and decreased in 15 cases, with a bacterial count of 10³/ml still observed in the remaining 3 cases. The efficacy of CXD by the U. T. I. guidelines was excellent in 2 cases, and good in 16 cases, with the exception of 2 drop-outs.
The isolated pathogens were mostly E. coli (17 cases), with the remainder being Klebsiella, P. mirabilis, Corynebacterium and S. epidermidis. CXD showed low MICs against all these microorganisms. No adverse reaction was observed., Japanese Society of Chemotherapy

CLINICAL EVALUATION OF 6059-S IN CHRONIC COMPLICATED URINARY TRACT INFECTION
MITSUHASHI SHIN-ICHI, HIKAGE TAKASHI, KUMAGAI AKIRA, CHEMOTHERAPY, 28, Supplement7, 734, 740, 1980
6059-S, a new injectable oxacephem antibiotic, was evaluated clinically in 14 cases of chronic complicated cystitis.
The drug was given by intravenous drip infusion at a daily dosage of 1g (2 g in one case) for 5 days.
The clinical response was excellent in 3 cases and good in 7 cases with the efficacy rate of 71%. The elimination of causative organisms was obtained in 16 (94%) out of 17 strains of Gram-negative bacilli, while it was obtained in 5 (50%) out of 10 strains of Gram-positive cocci. Of 5 strains of S.ftrecalis, only one was eradicated.
No side effect nor adverse reaction of clinical laboratory findings was observed., Japanese Society of Chemotherapy

THERAPEUTIC RESULTS WITH CEFTIZOXIME IN COMPLICATED URINARY TRACT INFECTION
MITSUHASHI SHINICHI, HIKAGE TAKASHI, KUMAGAYA AKIRA, CHEMOTHERAPY, 28, Supplement5, 601, 607, 1980
A clinical trial of ceftizoxime, a new injectable cephalosporin derivative, was conducted to assess itseffectiveness and safety in the treatment of urinary tract infections. Five patients with chronic pyelonephritis, including 2 cases of acute exacerbation, and 10 patients with chronic complicated cystitis received the drug, 0.5-2g twice daily for 5 days by i. V. drip infusion. By the criteria for drug efficacy evaluation in urinary tract infections, the therapeutic response was excellent in 1 case, good in 10 and poor in 4; hence an overall clinical effectiveness rate of 73. 3%. No subjective or objective adverse reactions were observed in any of the patients treated., Japanese Society of Chemotherapy

PROTIZINIC ACID FOR ACUTE CYSTITIS : EVALUATION BY A DOUBLE BLIND METHOD
Hirooka, Makoto, Hikage, Takashi, Acta urologica Japonica, 22, 6, 687, 695, Sep. 1976
Effect of protizinic acid as an adjuvant to antibiotics was evaluated in acute simple cystitis by a double blind method using bendinamine hydrochloride as a control drug. Both drugs showed good effect in improving symptoms, but the former was significantly superior to the latter in the total evaluation (0.05

IoTのシステムとEMC
電気学会, loT時代のシステムとEM, 調査専門委員会, 4.8 ペースメーカ等医療機器とEMC
電気書院, Feb. 2025, 9784485665657, 325, Japanese, Textbook, 電気学会電磁環境技術委員会の「IoT時代のシステムとEMC調査専門委員会」が、2018年4月から３年半の間に調査した結果から、それぞれの分野の知見を集めて、EMC技術を取り巻く状況、各国のIoT推進体制、IoTシステムの構成技術、IoTの導入事例などのIoT時代の各種システムのありようをEMCの観点でまとめました。, [Contributor]

電気の疑問66 : みんなを代表して専門家に聞きました
オーム社, 電気の疑問EXPERTS
オーム社, Jun. 2024, 9784274232114, 271p, Japanese, [Contributor]

Wireless Power Transfer Technologies, 2nd Edition
Chapter13: Impact of electromagnetic interference arising from wireless power transfer upon implantable medical device
The Institution of Engineering and Technology, Savoy Place, London WC2R 0BL, UK.,, Apr. 2024, 9781839538926, English, Scholarly book, ［Internationally co-authored］, [Contributor]

空間伝送型ワイヤレス給電技術の最前線　　　　　　　　　　　　　　　
監修, 篠原真毅
シーエムシー出版, May 2021, 9784781316031, [Contributor]

Wireless Power Transfer: Theory, technology, and applications　　　　　　　　　　　　　　　
Naoki Shinohara, 13 Impact of electromagnetic interference arising from wireless power transfer upon implantable medical device
IET (The Institution of Engineering and Technology), Jun. 2018, 9781785613463, 296, English, [Contributor]

ワイヤレス電力伝送技術の研究開発と実用化の最前線
監修, 篠原真毅, 8. ワイヤレス給電とEMC -ペースメーカを一例に-
シーエムシー出版, 2016, 9784781311753, Japanese, [Contributor]

大規模FDTD解析による小型航空機電波高度計の干渉経路損失特性評価—Evaluation of Interference Path Loss Characteristics of Small Aircraft Radio Altimeter by Large-scale FDTD Analysis—電磁環境/半導体電力変換研究会・半導体電力変換,EMC一般
牛丸 皓介, 日景 隆, 大宮 学, 二ッ森 俊一
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編], 30 May 2025, 東京 : 電気学会, Japanese
30 May 2025 - 30 May 2025

自律型海中ロボット等の広域海中電波通信特性評価を目的としたFDTDシミュレーションに関する検討—Study on FDTD Simulation for Evaluating Wide-Area Subsea Radio Communication Characteristics of Autonomous Underwater Vehicles—電磁環境/半導体電力変換研究会・半導体電力変換,EMC一般
清水 智裕, 日景 隆
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編], 30 May 2025, 東京 : 電気学会, Japanese
30 May 2025 - 30 May 2025

マイクロ波ばく露による医療用金属プレート空隙部の温度上昇および局所平均SARのばく露偏波依存性評価—Numerical Assessment of Exposure Polarization Dependency of Temperature Increase and Peak Spatial-Averaged SAR Due to Implanted Medical Metal Plates under Microwave Exposure—電磁環境研究会 マイクロ波,電磁界シミュレーション,EMC一般
脇 修平, 津村 楓奈, 日景 隆, 長岡 智明
電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan, 17 Oct. 2024, 東京 : 電気学会, Japanese
17 Oct. 2024 - 17 Oct. 2024

Sub-6GHz周波数帯電波ばく露下における植込み型医療機器EMI距離特性推定手法の検討—Estimation of EMI Distance Characteristics of Active Implantable Medical Devices in Sub-6 Frequency Band—電磁環境 半導体電力変換合同研究会 半導体電力変換,EMC一般
津村 楓奈, 脇 修平, 日景 隆, 栃倉 芳年, 井山 隆弘, 東山 潤司, 鈴木 恭宜
電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan, 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

複数箇所に対するミリ波局所ばく露の温熱生理反応調査を目的とした60GHz空間合成ばく露装置の開発—Development of a 60GHz Spatial Synthesis Exposure System for Investigating the Thermal Physiological Responses to Millimeter-Wave Localized Exposure at Multiple Points—電磁環境 半導体電力変換合同研究会・半導体電力変換,EMC一般
敦賀 桜, 日景 隆, 増田 宏, 石竹 達也, Kun Li, 永井 亜希子
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編], 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

密度の異なる体内埋込金属器具を装着した人体に対するマイクロ波ばく露における局所平均SAR評価—Numerical Assessment of Peak spatial-averaged SAR of Human Body with Metallic Implants for Different Mass Density under Microwave Exposure—電磁環境 半導体電力変換合同研究会・半導体電力変換,EMC一般
脇 修平, 津村 楓奈, 日景 隆, 長岡 智明
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編], 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

複数種類の数値人体モデルを用いた上向き電波ばく露に対するSAR評価—Specific Absorption Rates Evaluation for Upward Radio Wave Exposure Using Various Numerical Phantom Models—電磁環境 半導体電力変換合同研究会・半導体電力変換,EMC一般
篭橋 みのり, 日景 隆, 山本 学
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編], 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

Sub-6GHz周波数帯電波ばく露下における植込み型医療機器EMI距離特性推定手法の検討—Estimation of EMI Distance Characteristics of Active Implantable Medical Devices in Sub-6 Frequency Band—電磁環境 半導体電力変換合同研究会・半導体電力変換,EMC一般
津村 楓奈, 脇 修平, 日景 隆, 栃倉 芳年, 井山 隆弘, 東山 潤司, 鈴木 恭宜
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編], 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

複数箇所に対するミリ波局所ばく露の温熱生理反応調査を目的とした60GHz空間合成ばく露装置の開発—Development of a 60GHz Spatial Synthesis Exposure System for Investigating the Thermal Physiological Responses to Millimeter-Wave Localized Exposure at Multiple Points—電磁環境 半導体電力変換合同研究会 半導体電力変換,EMC一般
敦賀 桜, 日景 隆, 増田 宏, 石竹 達也, Kun Li, 永井 亜希子
電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan, 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

密度の異なる体内埋込金属器具を装着した人体に対するマイクロ波ばく露における局所平均SAR評価—Numerical Assessment of Peak spatial-averaged SAR of Human Body with Metallic Implants for Different Mass Density under Microwave Exposure—電磁環境 半導体電力変換合同研究会 半導体電力変換,EMC一般
脇 修平, 津村 楓奈, 日景 隆, 長岡 智明
電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan, 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

複数種類の数値人体モデルを用いた上向き電波ばく露に対するSAR評価—Specific Absorption Rates Evaluation for Upward Radio Wave Exposure Using Various Numerical Phantom Models—電磁環境 半導体電力変換合同研究会 半導体電力変換,EMC一般
篭橋 みのり, 日景 隆, 山本 学
電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan, 28 Jun. 2024, 東京 : 電気学会, Japanese
28 Jun. 2024 - 28 Jun. 2024

日常環境における中間周波数電磁波ばく露および携帯電話等デバイスの使用と子どもの健康の関連　　　　　　　　　　　　　　　
山崎 圭子, 池田 敦子, 日景 隆, 岸 玲子
北海道公衆衛生学雑誌, Mar. 2024, 北海道公衆衛生学会, Japanese
Mar. 2024 - Mar. 2024

High-Precision Estimation of Aircraft Altimeter Radar Propagation Using Parallel FDTD Analysis　　　　　　　　　　　　　　　
牛丸皓介, 日景隆, 大宮学, 二ッ森俊一, 平賀規昭, 米本成人, 河村暁子
電子情報通信学会大会講演論文集(CD-ROM), 2024
2024 - 2024

Characteristics evaluation of miniaturized patch array antenna with circular polarization for IoT platform via LEO satellite　　　　　　　　　　　　　　　
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔
電子情報通信学会大会講演論文集(CD-ROM), 2024
2024 - 2024

Accurate FDTD Simulation for EMI Evaluation of Implantable Cardiac Pacemakers Exposed to 5G Quasi-Millimeter-Wave Frequency Band Radio Waves　　　　　　　　　　　　　　　
津村楓奈, 脇修平, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

Characteristics evaluation by prototype measurement of quasi-millimeter wave wideband slot array antenna with double-sided feeding circuit　　　　　　　　　　　　　　　
山田晴大, 日景隆, 山本学, 和井秀樹, 藤田隆史
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

Numerical Estimation of Exposure Polarization Dependency of Temperature Increase Due to Implanted Medical Metal Plates Exposed to Radiofrequency Wave in the Cellular Frequency Band　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

Estimation of Body Shielding in the 5G mm-Wave Frequency Band Using a Smoothed Voxel Human Phantom and the Parallel FDTD Method　　　　　　　　　　　　　　　
日下部洸希, 牛丸皓介, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

Absorbed Power Density Evaluation of a 60 GHz Spatial Synthesis Exposure System for Investigating the Thermo-Physiology to Millimeter-Wave Localized Exposure at Multiple Points　　　　　　　　　　　　　　　
敦賀桜, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

A study on characteristics evaluation of an array antenna consisting of miniaturized circularly polarized patch antenna for earth sensing platform via LEO satellite　　　　　　　　　　　　　　　
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

High-Resolution Evaluation of Propagation Characteristics of Small Aircraft Radio Altimeter by Large-Scale FDTD Analysis　　　　　　　　　　　　　　　
牛丸皓介, 日景隆, 大宮学, 森岡和行, 二ッ森俊一
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

SAR Evaluation for 5G Smartphones Using Child Phantom Models　　　　　　　　　　　　　　　
篭橋みのり, 日景隆, 西村寿彦, 柏達也, 山崎圭子, 田村菜穂美, 岸玲子
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2024
2024 - 2024

A study of miniaturized patch array antenna with circular polarization for IoT platform via LEO satellite　　　　　　　　　　　　　　　
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔
電子情報通信学会大会講演論文集(CD-ROM), 2024
2024 - 2024

Radio Altimeter Interference Path Loss Characteristics of Small Size Aircraft During Flight-Measurement and Evaluation Based on Beechcraft B300 Aircraft-　　　　　　　　　　　　　　　
二ッ森俊一, 平賀規昭, 脇修平, 牛丸皓介, 日景隆
電子情報通信学会大会講演論文集(CD-ROM), 2024
2024 - 2024

Evaluation of SAR in Vertical Upward Radio Wave Exposure Using Numerical Phantom Models for Different Ages and Genders　　　　　　　　　　　　　　　
篭橋みのり, 日景隆, 山本学
電子情報通信学会大会講演論文集(CD-ROM), 2024
2024 - 2024

Evaluation Model and Comparative Analysis of Low and Intermediate Frequency Magnetic Field Exposure　　　　　　　　　　　　　　　
日景隆, 佐々木謙介, 椎名健雄, 鈴木敬久, 染野薫, 安永高志
電気学会基礎・材料・共通部門大会(Web), 2024
2024 - 2024

Numerical Assessment of Exposure Polarization Dependency of Temperature Increase and Peak Spatial-Averaged SAR Due to Implanted Medical Metal Plates under Microwave Exposure　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Introduction to the Activities of the Investigating R&D Committee on Recent Trends of Advanced Fundamental Technologies for Assessment of Electromagnetic Field Exposure　　　　　　　　　　　　　　　
鈴木敬久, 日景隆, 佐々木謙介, 椎名健雄
電気学会基礎・材料・共通部門大会(Web), 2024
2024 - 2024

Evaluation techniques for Electro-Magnetic Interference on implantable medical devices from emerging electromagnetic waves such as wireless power transmission systems　　　　　　　　　　　　　　　
津村楓奈, 脇修平, 日景隆
地域ケアリング, 2024
2024 - 2024

International Activities in the Technical Committee on Antennas and Propagation　　　　　　　　　　　　　　　
榊原久二男, 福迫武, 日景隆, 高橋徹
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Numerical Assessment of Temperature Increase Due to Implanted Metal Plates with Screw Holes under Exposure of Cellular Frequency Bands　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Specific Absorption Rates Evaluation for Upward Radio Wave Exposure Using Various Numerical Phantom Models　　　　　　　　　　　　　　　
篭橋みのり, 日景隆, 山本学
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Faculty of Information science and technology, Hokkaido University　　　　　　　　　　　　　　　
日景隆, 下谷内佑豪, 日下部洸希
地域ケアリング, 2024
2024 - 2024

Interference Induced Voltage Assessment for Electromagnetic Interference on Implantable Medical Devices Due to Magnetic Coupling WPT System at 6 MHz Bands　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Numerical Assessment of Peak spatial-averaged SAR of Human Body with Metallic Implants for Different Mass Density under Microwave Exposure　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Estimation of EMI Distance Characteristics of Implantable Medical Devices under Quasi-millimeter-wave Band 28 GHz Radio Exposure　　　　　　　　　　　　　　　
津村楓奈, 脇修平, 日景隆, 石岡諒汰, 井山隆弘, 東山潤司, 鈴木恭宜
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Development of a 60GHz Spatial Synthesis Exposure System for Investigating the Thermal Physiological Responses to Millimeter-Wave Localized Exposure at Multiple Points　　　　　　　　　　　　　　　
敦賀桜, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Estimation of EMI Distance Characteristics of Active Implantable Medical Devices in Sub-6 Frequency Band　　　　　　　　　　　　　　　
津村楓奈, 脇修平, 日景隆, 栃倉芳年, 井山隆弘, 東山潤司, 鈴木恭宜
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

60 GHz Spatial Synthetic High-Localized Exposure System for Investigating Relevance of Millimeter-Wave Localized Exposure at Multiple Points to Thermal-Physiology　　　　　　　　　　　　　　　
敦賀桜, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

Large-scale FDTD analysis using a small aircraft for evaluating interference path loss characteristics of radio altimeter　　　　　　　　　　　　　　　
牛丸皓介, 日景隆, 大宮学, 森岡和行, 二ッ森俊一
電子情報通信学会技術研究報告(Web), 2024
2024 - 2024

携帯電話等による電磁波への胎児期曝露に関する最近の研究動向 文献調査　　　　　　　　　　　　　　　
山崎 圭子, 田村 菜穂美, Ajmal Ammara, 日景 隆, 岸 玲子
北海道公衆衛生学雑誌, Nov. 2023, 北海道公衆衛生学会, Japanese
Nov. 2023 - Nov. 2023

子どものスクリーンタイムと聴覚・視覚ワーキングメモリーとの関連 北海道スタディ
田村 菜穂美, 山崎 圭子, 宮下 ちひろ, 池田 敦子, 日景 隆, 水田 正弘, 大宮 学, 竹鼻 美月, 赤坂 梨莉花, 岸 玲子
日本衛生学雑誌, Mar. 2023, (一社)日本衛生学会, Japanese
Mar. 2023 - Mar. 2023

学童期の子どもの電磁波曝露実態の変化 北海道スタディ
山崎 圭子, 宮下 ちひろ, 田村 菜穂美, 池田 敦子, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
日本衛生学雑誌, Mar. 2023, (一社)日本衛生学会, Japanese
Mar. 2023 - Mar. 2023

携帯電話等による電磁波への胎児期曝露に関する最近の研究動向:文献調査　　　　　　　　　　　　　　　
山崎圭子, 田村菜穂美, AJMAL Ammara, 日景隆, 岸玲子
北海道公衆衛生学雑誌, 2023
2023 - 2023

Estimation of Radio Propagation Characteristics in an Urban Area of Sapporo City Using Large-scaled Parallel FDTD Analysis
日景 隆
proc. of The 23rd Chitose International Forum on Science & Technology, 2023
2023 - 2023

Numerical Estimations of Specific Absorption Rates for Vertical Exposure Using Anatomical Phantom Models Across Different Ages and Genders
日景 隆
proc. of 2023 International Conference on Emerging Technologies for Communications, 2023
2023 - 2023

A design of quasi-millimeter wave wideband slot array antenna with double-sided feeding circuit　　　　　　　　　　　　　　　
大野和輝, 日景隆, 山本学, 和井秀樹, 北直樹
電子情報通信学会大会講演論文集(CD-ROM), 2023
2023 - 2023

Numerical Estimations of Specific Absorption Rates for Vertical Exposure Using Anatomical Phantom Models of Different Age and Gender　　　　　　　　　　　　　　　
篭橋みのり, 日景隆, 山本学
電子情報通信学会大会講演論文集(CD-ROM), 2023
2023 - 2023

International Standardization Progress of Wireless Avionics Intra-Communication and Research and Development of Electromagnetic Environment Evaluation Technologies　　　　　　　　　　　　　　　
二ッ森俊一, 日景隆
電子情報通信学会大会講演論文集(CD-ROM), 2023
2023 - 2023

Numerical Evaluation of the Impact of Mass Averaging on Local SAR in Human Bodies with Implanted Medical Metal Plates Exposed to Microwaves in the Cellular Frequency Band　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電子情報通信学会大会講演論文集(CD-ROM), 2023
2023 - 2023

A design of miniaturized patch antenna with circular polarization for earth sensing platform via LEO satellite　　　　　　　　　　　　　　　
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔
電子情報通信学会大会講演論文集(CD-ROM), 2023
2023 - 2023

Characteristics evaluation of miniaturized patch antenna with circular polarization for earth sensing platform via LEO satellite　　　　　　　　　　　　　　　
古御堂隼人, 日景隆, 山本学, 坂元一光, 藤野洋輔
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

Numerical Estimation of Wi-Fi Frequency Band Receiving Characteristics for Portable Exposimeter for Epidemiological Research on High-Frequency Exposure and Child Health　　　　　　　　　　　　　　　
敦賀桜, 杉村海渡, 日景隆, 山崎圭子, 宮下ちひろ, 田村菜穂美, 荒木敦子, 岸玲子
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

Numerical Evaluation of Human Safety for Exposure to Electromagnetic Radiation from 6 MHz Band Magnetically Coupled WPT Systems　　　　　　　　　　　　　　　
欠端雨音, 日景隆
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

Novel Estimation of Radio Propagation Characteristics in an Urban Area of Sapporo City Using Project PLATEAU and Large-scaled Parallel FDTD analysis　　　　　　　　　　　　　　　
牛丸皓介, 日景隆, 山本学, 大宮学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

Characteristics evaluation of quasi-millimeter wave wideband slot array antenna with double-sided feeding circuit　　　　　　　　　　　　　　　
大野和輝, 日景隆, 山本学, 和井秀樹, 北直樹
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

A Precise FDTD Simulation for EMI Estimation of Implantable Cardiac Pacemaker Due to Mobile Radio in the 5G Sub-6 GHz Band　　　　　　　　　　　　　　　
津村楓奈, 脇修平, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

Development of a 60 GHz Multi-Point Simultaneous Exposure System for Investigating Thermal Physiology and Cellular Effects During Localized Millimeter-Wave Exposure　　　　　　　　　　　　　　　
杉村海渡, 敦賀桜, 日景隆, 増田宏
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

Numerical Estimation of Specific Absorption Rates in Vertical Exposure Using Various Anatomical Phantom Models　　　　　　　　　　　　　　　
篭橋みのり, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

Averaging Mass for Estimation of Local SAR Enhancement Due to Implanted Medical Metal Plates Exposed to Radiofrequency Wave in the Cellular Frequency Band　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023
2023 - 2023

2×2 Planar Array of X-Shaped Slot Antennas for Millimeter Wave Frequency Band
Mangseang Hor, Masanobu Hirose, Takashi Hikage
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 2023
2023 - 2023

X-Shaped Slot Antenna for Sub-6 GHz 5G Application
Mangseang Hor, Masanobu Hirose, Takashi Hikage
2023 35th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2023, 2023
2023 - 2023

Change of radiofrequency electromagnetic exposure of children from 2020 to 2021: A report from Hokkaido Study
Keiko Yamazaki, Naomi Tamura, Chihiro Miyashita, Toshio Yoshikawa, Atsuko Ikeda-Araki, Takashi Hikage, Manabu Omiya, Masahiro Mizuta, Miwa Ikuyo, Kazuhiro Tobita, Teruo Onishi, Masao Taki, Soichi Watanabe, Reiko Kishi
2023 35th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2023, 2023
2023 - 2023

Novel Vertically Exposure System Using Spatial Synthetic Antennas to Investigate Thermo-Physiological and Cellular Function Changes Induced by Millimeter-Wave Exposure
Kaito Sugimura, Takashi Hikage, Hiroshi Masuda, Tatsuya Ishitake, Kun Li, Akiko Nagai
2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023, 2023
2023 - 2023

Interference-Induced Voltage Estimation for EMI Characteristics Evaluation of Implantable Medical Devices Exposed to 5G Frequency Radio Waves
Funa Tsumura, Shuhei Waki, Takashi Hikage, Takahiro Iyama, Junji Higashiyama, Yasunori Suzuki
2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023, 2023
2023 - 2023

Human Body Blockage Effects on Personal Exposimeter Device in 4G/5G Frequency Bands for Epidemiological Research on Children's Health
Sakura Tsuruga, Manabu Omiya, Chihiro Miyashita, Kaito Sugimura, Keiko Yamazaki, Naomi Tamura, Takashi Hikage, Atsuko Ikeda-Araki, Reiko Kishi
2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023, 2023
2023 - 2023

Propagation Characteristics Estimation for Indoor 5G Wireless Environment Including Human Body Shielding Using Parallel FDTD Method
Kohsuke Ushimaru, Takashi Hikage, Manabu Yamamoto, Manabu Omiya
2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023, 2023
2023 - 2023

Interference Voltage Measurement for EMI Evaluation of Active Implantable Medical Devices by Exposure to 4G and 5G Frequency Radio Waves using Electro-Optical Converter　　　　　　　　　　　　　　　
西川拓次, 日景隆, 井山隆弘, 東山潤司, 鈴木恭宜
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

Estimation of Human Blockage Characteristics for Indoor Propagation in a Local-5G Frequency Band Using Large Scale FDTD Analysis　　　　　　　　　　　　　　　
吉田総希, 日景隆, 大宮学
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

Performance Evaluation of 60 GHz Exposure Set-up for Study of Changes in Thermal Physiology and Cellular Mechanisms Induced by Localized Millimeter-wave Exposure　　　　　　　　　　　　　　　
山本康平, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

子どものスクリーンタイムと聴覚・視覚ワーキングメモリーとの関連:北海道スタディ　　　　　　　　　　　　　　　
田村菜穂美, 山崎圭子, 宮下ちひろ, 池田敦子, 池田敦子, 日景隆, 水田正弘, 大宮学, 竹鼻美月, 赤坂梨莉花, 岸玲子
日本衛生学雑誌(Web), 2023
2023 - 2023

学童期の子どもの電磁波曝露実態の変化-北海道スタディ　　　　　　　　　　　　　　　
山崎圭子, 宮下ちひろ, 田村菜穂美, 池田敦子, 池田敦子, 日景隆, 水田正弘, 大宮学, 岸玲子
日本衛生学雑誌(Web), 2023
2023 - 2023

Characteristics Estimation of 60 GHz Exposure Equipment for Investigation of Effects of Local Exposure to Millimeter-waves on Thermal Physiology and Cellular Functions　　　　　　　　　　　　　　　
杉村海渡, 敦賀桜, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

Experimental Assessment of Temperature Increase Due to Implanted Metal Plates under Combined Exposure of 4G and 5G Sub-6GHz Bands　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

A study on quasi-millimeter wave wideband slot array antenna with double-sided feeding circuit　　　　　　　　　　　　　　　
大野和輝, 日景隆, 山本学, 和井秀樹, 北直樹
電子情報通信学会大会講演論文集(CD-ROM), 2023
2023 - 2023

Arrival Angle Dependency of SAR Enhancement Characteristics Due to Implanted Metal Plates Exposed to Plane Waves　　　　　　　　　　　　　　　
脇修平, 西川拓次, 日景隆, 長岡智明
電子情報通信学会大会講演論文集(CD-ROM), 2023
2023 - 2023

Evaluation of 60 GHz Exposure Equipment for Investigation of Effects of Local Exposure to Millimeter-waves on Thermal Physiology and Cellular Functions　　　　　　　　　　　　　　　
杉村海渡, 敦賀桜, 日景隆, 増田宏, 石竹達也, LI Kun, 永井亜希子
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

Characteristics of Human Body Shadowing Considering Elevation Angle in 5G Frequency Band for Epidemiological Research on RF Exposure and Children’s Health　　　　　　　　　　　　　　　
敦賀桜, 杉村海渡, 日景隆, 大宮学, 山崎圭子, 宮下ちひろ, 田村奈穂美, 池田敦子, 岸玲子
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

Numerical Estimation of Temperature Increase Due to Implanted Metal Plates Under Radio Frequency Exposure of 4G/LTE Frequency Bands　　　　　　　　　　　　　　　
脇修平, 津村楓奈, 日景隆, 長岡智明
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

Characteristics Evaluation of Wideband Slot Array Antenna with Slitted Reflector by Prototype Measurement　　　　　　　　　　　　　　　
大野和輝, 日景隆, 山本学, 和井秀樹, 北直樹
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

EM Wave Exposure Assessment Technology for Human Bodies: 5: Experimental Investigation of SAR Enhancement Due to Implant Metal Exposed to External Electromagnetic Waves　　　　　　　　　　　　　　　
日景隆
情報通信研究機構研究報告, 2023
2023 - 2023

Estimation of the Perceptual Temperature Rise for Localized Electromagnetic Exposure at 28 GHz　　　　　　　　　　　　　　　
新井紀香, 小寺紗千子, 上原信太郎, 湯浅明子, 牛澤一樹, 大高洋平, 日景隆, 平田晃正
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

Numerical Estimation of Specific Absorption Rates in Vertical Upward Exposures Using Various Anatomical Human Body Models　　　　　　　　　　　　　　　
篭橋みのり, 日景隆, 山本学
電子情報通信学会技術研究報告(Web), 2023
2023 - 2023

4G/LTE周波数帯の遠方界ばく露における医療用埋込金属プレート近傍のSAR上昇推定—Numerical Estimation of SAR Enhancement Due to Implanted Metal Plates Exposed to Far-Field at 4G/LTE Frequency Bands—電磁環境 半導体電力変換合同研究会・半導体電力変換,EMC一般　　　　　　　　　　　　　　　
脇 修平, 西川 拓次, 日景 隆, 長岡 智明
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編], 07 Dec. 2022, Japanese
07 Dec. 2022 - 07 Dec. 2022

医療・福祉分野のデジタルトランスフォーメーションを支える電波の植込み型医療器EMI評価技術　　　　　　　　　　　　　　　
日景 隆, 脇 修平, 西川 拓次
Precision Medicine, Aug. 2022, (株)北隆館, Japanese
Aug. 2022 - Aug. 2022, 医療・福祉分野で進むデジタルトランスフォーメーション(DX)を支える電波利用に対する体内植込み型医療機器(心臓ペースメーカ/ICD)の電磁干渉影響(EMI)とその評価法について概説する。第5世代移動通信システムやワイヤレス電力伝送装置など、新たな電波利用がDXを加速させる状況において、電波機器の利用者、植込み型医療機器などの装着者、双方の機器の製造者などが影響の発生・防止に関する情報を共有し、影響防止に努めていくことが重要である。(著者抄録)

学童期における携帯電話等の電磁波曝露の実態調査 北海道スタディ
山崎 圭子, 田村 菜穂美, 宮下 ちひろ, 池田 敦子, 福永 久典, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
日本衛生学雑誌, Mar. 2022, (一社)日本衛生学会, Japanese
Mar. 2022 - Mar. 2022

子どものスクリーンタイムおよび問題行動との関連 北海道スタディ
田村 菜穂美, 山崎 圭子, 宮下 ちひろ, 池田 敦子, 福永 久典, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
日本衛生学雑誌, Mar. 2022, (一社)日本衛生学会, Japanese
Mar. 2022 - Mar. 2022

小児の携帯情報端末の使用開始年齢と問題行動の程度との関連 北海道スタディ
宮下 ちひろ, 山崎 圭子, 田村 菜穂美, 池田 敦子, 福永 久典, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
日本衛生学雑誌, Mar. 2022, (一社)日本衛生学会, Japanese
Mar. 2022 - Mar. 2022

Using FEM Simulation to Estimation of Active Implantable Medical Device EMI Characteristic in the 4G and 5G Sub-6 Frequency Bands
日景 隆
proc. of 2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM2022), 2022
2022 - 2022

Propagation Loss Characteristics Considering Human Body Shadowing in Local 5G Frequency Band Using Parallel FDTD Analysis
日景 隆
proc. of The 2022 International Symposium on Antennas and Propagation (ISAP2022), 2022
2022 - 2022

Evaluation of Aircraft Cabin- to-Exterior Propagation Characteristics for 4 GHz-band WAIC Systems using a Large Scale FDTD Analysis　　　　　　　　　　　　　　　
関口徹也, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 森岡和行, 河村暁子, 米本成人
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

A Study on FDTD Simulation of Lens Antennas for Spatial Synthetic Exposure System　　　　　　　　　　　　　　　
尾崎龍之介, 山本尚也, 日景隆
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

Estimation of Human Body Blockage Effects on Portable Exposure Meter for Epidemiological Studies on Radio Wave Exposure and Health Effects in Adolescents　　　　　　　　　　　　　　　
山本康平, 日景隆, 大宮学, 山崎圭子, 池田敦子, 宮下ちひろ, 田村菜穂美, 岸玲子
電子情報通信学会大会講演論文集(CD-ROM), 2022
2022 - 2022

Numerical Estimation of SAR Enhancement Due to Implanted Metal Plates Exposed to Far-Field at 4G/LTE Frequency Bands　　　　　　　　　　　　　　　
脇修平, 西川拓次, 日景隆, 長岡智明
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

A Study on Miniaturized Patch Antenna with Circular Polarization for Earth Sensing Platform via LEO Satellite　　　　　　　　　　　　　　　
大友啓暉, 日景隆, 山本学, 坂元一光, 藤野洋輔
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

Estimation of Electromagnetic Coupling Due to Lead on Pacemaker EMI in Cellular Frequency Band　　　　　　　　　　　　　　　
西川拓次, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022
2022 - 2022

A fundamental study on miniaturized patch antenna with L-probe feed and circular polarization　　　　　　　　　　　　　　　
大友啓暉, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022
2022 - 2022

Numerical Estimation of SAR Enhancement Due to Implanted Metal Plates Exposed to Circularly Polarized Wave　　　　　　　　　　　　　　　
脇修平, 西川拓次, 日景隆, 長岡智明
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022
2022 - 2022

Fundamental study on quasi-millimeter wave band slot array antenna with double-sided feeding circuit　　　　　　　　　　　　　　　
大野和輝, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022
2022 - 2022

Estimation of Human Body Blockage Characteristics Considering Elevation Angle of Plane-wave for RF Dosimetry of Adolescent　　　　　　　　　　　　　　　
杉村海渡, 山本康平, 日景隆, 山崎恵子, 宮下ちひろ, 田村菜穂美, 荒木敦子, 岸玲子
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022
2022 - 2022

Large-scale FDTD Analysis for Optimal Wireless Link Design of Local 5G in Real Indoor Propagation Environment　　　　　　　　　　　　　　　
吉田総希, 日景隆, 山本学, 大宮学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022
2022 - 2022

子どものスクリーンタイムおよび問題行動との関連:北海道スタディ　　　　　　　　　　　　　　　
田村菜穂美, 山崎圭子, 宮下ちひろ, 池田敦子, 池田敦子, 福永久典, 日景隆, 水田正弘, 大宮学, 岸玲子
日本衛生学雑誌(Web), 2022
2022 - 2022

学童期における携帯電話等の電磁波曝露の実態調査-北海道スタディ　　　　　　　　　　　　　　　
山崎圭子, 田村菜穂美, 宮下ちひろ, 池田敦子, 池田敦子, 福永久典, 日景隆, 水田正弘, 大宮学, 岸玲子
日本衛生学雑誌(Web), 2022
2022 - 2022

小児の携帯情報端末の使用開始年齢と問題行動の程度との関連-北海道スタディ　　　　　　　　　　　　　　　
宮下ちひろ, 山崎圭子, 田村菜穂美, 池田敦子, 池田敦子, 福永久典, 日景隆, 水田正弘, 大宮学, 岸玲子
日本衛生学雑誌(Web), 2022
2022 - 2022

Characterization of Human Body Blockage in Cellular and Wireless LAN Frequency Bands for Epidemiologic Research on Association Between Radio Frequency Wave Exposure and Children Health　　　　　　　　　　　　　　　
山本康平, 杉村海渡, 日景隆, 大宮学, 山崎圭子, 宮下ちひろ, 田村奈穂美, 池田敦子, 岸玲子
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

Estimation on Human Body Blockage Characteristics of Child Model for Epidemiologic Research on RF Exposure and Adolescent Health　　　　　　　　　　　　　　　
杉村海渡, 山本康平, 日景隆, 大宮学, 山崎圭子, 宮下ちひろ, 田村奈穂美, 池田敦子, 岸玲子
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

Estimation of Exposure Polarization Dependent Characteristics of Active Implantable Medical Device EMI in 5G Sub-6 Frequency Band　　　　　　　　　　　　　　　
西川拓次, 日景隆, 井山隆弘, 東山潤司, 鈴木恭宜
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

Active Implantable Medical Device EMI Estimation for EV-Charging WPT Systems　　　　　　　　　　　　　　　
脇修平, 西川拓次, 日景隆
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

FDTD Simulation for Specific Absorption Rate Enhancement Due to Metallic Plate Implants with Screw Holes at Mobile Radio Frequency Bands　　　　　　　　　　　　　　　
西川拓次, 日景隆, 長岡智明
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

A Study on Gain Reduction Suppression in a Wideband Slot Array Antenna with a Reflector　　　　　　　　　　　　　　　
山本尚也, 日景隆, 山本学, 和井秀樹, 岩國辰彦, 内田大誠, 北直樹
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

Measurement of Temperature Rise due to RF Exposure Around Implanted Metal Plates for Mandibular Fracture Fixation　　　　　　　　　　　　　　　
西川拓次, 大塚敦生, 日景隆, 長岡智明
電子情報通信学会大会講演論文集(CD-ROM), 2022
2022 - 2022

Estimation of Indoor Propagation Characteristics Considering Human Blockage at 5G Frequency Band Using Parallelized FDTD Analysis　　　　　　　　　　　　　　　
吉田総希, 日景隆, 山本学, 久野伸晃, 猪又稔, 山田渉
電子情報通信学会大会講演論文集(CD-ROM), 2022
2022 - 2022

A study on a wideband rectangular loop antenna backed by a periodic patch-loaded grounded slab　　　　　　　　　　　　　　　
大友啓暉, 日景隆, 山本学
電子情報通信学会大会講演論文集(CD-ROM), 2022
2022 - 2022

FEM Simulation of induced interference voltage of implantable medical devices near dipole and slot antennas in 5G sub6 frequency band　　　　　　　　　　　　　　　
大塚敦生, 西川拓次, 日景隆, 井山隆弘, 東山潤司, 鈴木恭宜
電子情報通信学会技術研究報告(Web), 2022
2022 - 2022

医療・福祉IoTを支える電波の植込み型医療器EMI評価技術—Assessment technique for active implantable medical device EMI for new wireless IoT devices
日景 隆, 大塚 敦生, 西川 拓次
地域ケアリング / 地域ケアリング企画編集委員会 編, Aug. 2021, 北隆館, Japanese
Aug. 2021 - Aug. 2021

新たな電波利用に向けた植込み型医療器EMI評価技術—Novel assessment technique for active implantable medical device EMI due to new wireless equipments
日景 隆, 大塚 敦生, 西川 拓次
Bio clinica = バイオクリニカ, Jul. 2021, Japanese
Jul. 2021 - Jul. 2021

電波へのばく露による児の精神神経発達への影響に関する最近の研究動向 文献調査　　　　　　　　　　　　　　　
山崎 圭子, 荒木 敦子, 田村 菜穂美, 寺岡 友里, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
北海道公衆衛生学雑誌, Mar. 2021, 北海道公衆衛生学会, Japanese
Mar. 2021 - Mar. 2021, 近年、電波ばく露環境は急速に変化していると考えられ、子どもの健康、特に精神神経発達への影響が懸念される。本研究の目的は、胎児期と出生後のばく露による子どもの精神神経発達への影響について先行研究を概観し、今後の研究の方向性を明らかにすることである。胎児期ばく露を扱った7編のうち3編で妊娠中の母の携帯電話使用状況と精神神経発達の間に負の関連が、1編で正の関連が報告されていた。出生後のばく露を扱った22編では、2編を除き、携帯電話使用状況または電波ばく露レベルと精神神経発達との負の関連が報告されていた。今後の研究では、携帯電話や電子機器の使用状況と電波ばく露による影響を独立に検討する必要がある。また、因果関係を考察するために適した前向き研究デザインを用いることが望ましい。さらに電波ばく露の背後にある交絡要因についても慎重に検討する必要がある。(著者抄録)

Human Shielding Loss Model Considering Frequency Characteristics in HAPS Communications　　　　　　　　　　　　　　　
佐藤彰弘, 木村翔, LIN Hoyu, 田中翔馬, 表英毅, 日景崇
電子情報通信学会大会講演論文集(CD-ROM), 2021
2021 - 2021

Design of Planar-Type Wideband Array Antenna Using Double-Sided Feeding Circuit and Leaf-Shaped Bowtie Slot Element　　　　　　　　　　　　　　　
山本尚也, 日景隆, 山本学
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Numerical Estimation of Indoor/Outdoor Multipath Propagation Characteristics Using a Large-Scale FDTD Analysis　　　　　　　　　　　　　　　
日景隆, 大宮学
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Assessment technique for active implantable medical device EMI for new wireless IoT devices　　　　　　　　　　　　　　　
日景隆, 大塚敦生, 西川拓次
地域ケアリング, 2021
2021 - 2021

Interference Path Loss Measurements at 4 GHz Radio Altimeter Band Based on Twin Turboprop Aircraft-Evaluations Using Beechcraft B300 aircraft-　　　　　　　　　　　　　　　
二ッ森俊一, 宮崎則彦, 日景隆, 関口徹也, 山本学, 野島俊雄
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Estimation on Human Body Blockage Characteristics at 5G Sub-6GHz Frequency bands for Epidemiologic Research on RF Exposure and Adolescent Health　　　　　　　　　　　　　　　
山本康平, 尾崎龍之介, 日景隆, 山崎圭子, 宮下ちひろ, 岸玲子
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Development of Novel 60 GHz Band Spatial Synthetic Exposure Set-up for Studies on Thermal Perception Thresholds of Biological Effects　　　　　　　　　　　　　　　
尾崎龍之介, 日景隆, 増田宏, 田口健治
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Interference-induced Voltage Estimation for Implantable Medical Devices Due to Near Field Exposure from Electric and Magnetic Antennas　　　　　　　　　　　　　　　
大塚敦生, 日景隆, 石岡諒汰, 東山潤司, 鈴木恭宜
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Evaluation of Cabin- to-Exterior Propagation Characteristics for Sub-6GHz/5G using Small Aircraft Model　　　　　　　　　　　　　　　
佐藤亜衣, 日景隆, 大宮学, 二ッ森俊一, 河村暁子, 米本成人
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Novel assessment technique for active implantable medical device EMI due to new wireless equipments　　　　　　　　　　　　　　　
日景隆, 大塚敦生, 西川拓次
Bio Clinica, 2021
2021 - 2021

A Study of Acceleration Method for Estimation on Propagation Characteristics in an Urban Environment Using Large-scale FDTD Analysis　　　　　　　　　　　　　　　
佐藤亜衣, 吉江明花, 日景隆, 山本学, 大宮学, 久野伸晃, 猪又稔, 山田渉
電子情報通信学会大会講演論文集(CD-ROM), 2021
2021 - 2021

Radio Altimeter Interference Pass Loss of Small Size Aircraft-Measurement and Evaluation Including Adjacent Frequency Bands using Beechcraft B300 Aircraft-　　　　　　　　　　　　　　　
二ッ森俊一, 宮崎則彦, 佐藤亜衣, 尾崎龍之介, 日景隆, 野島俊雄
電子情報通信学会大会講演論文集(CD-ROM), 2021
2021 - 2021

A Study on a Leaf-Shaped Bowtie Slot Array Antenna Using Double-Sided Feeding Circuits　　　　　　　　　　　　　　　
山本尚也, 日景隆, 山本学
電子情報通信学会大会講演論文集(CD-ROM), 2021
2021 - 2021

Interference Voltage Measurement Using an Electro-Optic Converter for Estimation of Implantable Cardiac Pacemaker EMI for 5G/Sub-6 GHz　　　　　　　　　　　　　　　
日景隆, 大塚敦生, 石岡諒汰, 東山潤司, 鈴木恭宜
電子情報通信学会大会講演論文集(CD-ROM), 2021
2021 - 2021

A Study on Simulation Accuracy for Numerical estimation of Indoor Multipath Propagation Characteristics Using a Large-Scale FDTD Analysis　　　　　　　　　　　　　　　
吉江明花, 佐藤亜衣, 日景隆, 山本学, 大宮学, 久野伸晃, 猪又稔, 山田渉
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Numerical Estimation on Active Implantable Medical Device EMI Due to 5G Sub6 Frequency band Using Finite Element Analysis　　　　　　　　　　　　　　　
SUN Jintao, 伊藤涼音, 日景隆
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Evaluation of Aircraft Cabin- to-Exterior Propagation Characteristics for Sub-6GHz/5G using a Large Scale FDTD Analysis　　　　　　　　　　　　　　　
佐藤亜衣, 吉田総希, 日景隆, 二ッ森俊一, 河村暁子, 米本成人
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

Estimation on Frequency Characteristics of SAR Elevation Due to Mandibular Treatment Plate Implantation　　　　　　　　　　　　　　　
伊藤涼音, 大塚敦生, 日景隆, 長岡智明, 和氣加奈子
電子情報通信学会技術研究報告(Web), 2021
2021 - 2021

電波へのばく露による児の精神神経発達への影響に関する最近の研究動向:文献調査　　　　　　　　　　　　　　　
山崎圭子, 荒木敦子, 田村菜穂美, 寺岡友里, 日景隆, 水田正弘, 大宮学, 岸玲子
北海道公衆衛生学雑誌, 2021
2021 - 2021

電波曝露と学童期の行動の問題及び認知機能との関連に関する最近の研究動向 文献調査
山崎 圭子, 荒木 敦子, 寺岡 友里, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
日本衛生学雑誌, Mar. 2020, (一社)日本衛生学会, Japanese
Mar. 2020 - Mar. 2020

電波および携帯電話への胎児期曝露による児の健康影響に関する最近の研究動向 文献調査
荒木 敦子, 山崎 圭子, 寺岡 友里, 日景 隆, 水田 正弘, 大宮 学, 岸 玲子
日本衛生学雑誌, Mar. 2020, (一社)日本衛生学会, Japanese
Mar. 2020 - Mar. 2020

Development of novel 68 GHz exposure equipment system for studies on thermal perception thresholds of biological effects exposed to millimeter-wave
日景 隆
Proc. of The Joint Annual Meeting of The Bioelectromagnetics Society and the European BioElectromagnetics Association (BioEM2020), 2020
2020 - 2020

Novel Interference Voltage Measurement for Beam-Type Wireless Power Transfer using Electro-Optic Converter for Active Implantable Medical Device EMI Assessment
日景 隆
Proc. of XXXIV General Assembly and Scientific Symposium (GASS) of the International Union of Radio Science, 2020
2020 - 2020

CHARACTERIZATION OF HUMAN BODY BLOCKAGE IN 5G FREQUENCY BANDS FOR LARGE SCALE EPIDEMIOLOGIC RESEARCH ON RF EXPOSURE AND ADOLESCENT HEALTH
日景 隆
Proc. of 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, 2020
2020 - 2020

Numerical Estimation of RF Leakage Wave Characteristics in WAIC Frequency Band using FDTD Simulation　　　　　　　　　　　　　　　
関口徹也, 日景隆, 山本学, 二ッ森俊一, 森岡和行, 河村暁子, 米本成人
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

Measurement of Temperature Rise Around Gap of Implanted Metal Plates with Screw Holes　　　　　　　　　　　　　　　
伊藤涼音, 日景隆, 山本学, 長岡智明, 和氣加奈子, 渡辺聡一
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

Interference Voltage Measurement Set-up for Estimation of Implantable Cardiac Pacemaker EMI for Sub6GHz of IMT-2020　　　　　　　　　　　　　　　
大塚敦生, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

Characteristics Evaluation of Rectangular Loop Antenna Backed by EBG Reflector　　　　　　　　　　　　　　　
鴫原達郎, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

Development of Novel 60 GHz Spatial Power Combining Exposure Set-up for Studies on Thermal Perception Thresholds of Biological Effects Exposed to mm-Wave　　　　　　　　　　　　　　　
尾崎龍之介, 日景隆, 山本学, 増田宏
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

Numerical Estimations of Specific Absorption Rates for 920MHz-band RFID Using Anatomical Phantom Models of Different Age and Gender　　　　　　　　　　　　　　　
木村凌太, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

A Study of Estimation Accuracy on Propagation Characteristics in an Urban Environment Using Commercial Software of Ray-tracing　　　　　　　　　　　　　　　
吉江明花, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

A Study of Safety Exposure Assessment for Multi-hop Magnetic Resonance Wireless Power Transfer System　　　　　　　　　　　　　　　
大勝隆平, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

Numerical Estimation on Received Power Distribution of RF Propagation in an Urban Environment Using FDTD simulation　　　　　　　　　　　　　　　
佐藤亜衣, 日景隆, 大宮学, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

A 16-element Leaf-Shaped Bowtie Slot Array Antenna Using Double-Sided Feeding Circuits　　　　　　　　　　　　　　　
山本尚也, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

Numerical Estimation on Interference Voltage at Implantable Cardiac Pacemaker Due to Near-field Exposure from Slot Antenna Using Finite Element Analysis　　　　　　　　　　　　　　　
SUN Jintao, 日景隆, 山本学
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2020
2020 - 2020

A Leaf-Shaped Bowtie Slot Array Antenna Using Double-Sided Feeding Circuits　　　　　　　　　　　　　　　
山本尚也, 日景隆, 山本学
電子情報通信学会大会講演論文集(CD-ROM), 2020
2020 - 2020

Aircraft Electric Field Strength Evaluations at 4 GHz Wireless Avionics Intra-Communications Band-Measurement of Ground Radiation Characteristics Using Beechcraft B300 Aircraft-　　　　　　　　　　　　　　　
二ッ森俊一, 宮崎則彦, 関口徹也, 日景隆, 野島俊雄
電子情報通信学会大会講演論文集(CD-ROM), 2020
2020 - 2020

Estimation on Human Body Blockage Characteristics at 5G Frequency Bands for Epidemiologic Research on RF Exposure and Adolescent Health　　　　　　　　　　　　　　　
尾崎龍之介, 日景隆, 大宮学, 水田正弘, 山崎圭子, 荒木敦子, 岸玲子
電子情報通信学会大会講演論文集(CD-ROM), 2020
2020 - 2020

Estimation of Specific Absorption Rate Around Gap of Implanted for Mandibular Fracture Fixation Metal Plates with Screw Holes　　　　　　　　　　　　　　　
伊藤涼音, 大塚敦生, 日景隆, 長岡智明, 和氣加奈子, 渡辺聡一
電子情報通信学会大会講演論文集(CD-ROM), 2020
2020 - 2020

Interference Voltage Measurement Set‐up for Beam‐Type WPT Using an Electro‐Optic Converter for Implantable Cardiac Pacemaker EMI Assessment
伊藤涼音, SUN Jintao, 日景隆, 東山潤司, 大西輝夫
電子情報通信学会技術研究報告, 12 Jul. 2019, Japanese

Evaluation of Propagation Characteristics on the Observation Plane outside the Aircraft Cabin for 4.4 GHz band WAIC System using a Large‐Scale FDTD Analysis
関口徹也, 日景隆, 山本学, 野島俊雄, 大宮学, 二ッ森俊一, 森岡和行, 河村暁子, 米本成人
電子情報通信学会技術研究報告, 10 Jul. 2019, Japanese

航空機内データ通信における国際標準化動向および電磁環境評価
二ッ森俊一, 森岡和行, 河村暁子, 米本成人, 日景隆, 関口徹也, 野島俊雄
電子航法研究所研究発表会講演概要, 06 Jun. 2019, Japanese

Numerical Estimation of Indoor Propagation Characteristics Considering Human‐Body Shadowing for Beam‐type Wireless Power Transfer
吉江明花, 榊原慶太, 日景隆
電子情報通信学会技術研究報告, 03 Jun. 2019, Japanese

In‐vitro Assessment of Electromagnetic Interference Caused by Wireless Power Transfer for Mobile Devices on Active Implantable Medical Devices
日景隆, SON Shinto, 野島俊雄
電子情報通信学会技術研究報告, 03 Jun. 2019, Japanese

Point Source Transmitting Power Estimation of Wireless Avionics Intra-Communication Systems Using the Large-Scale FDTD Method
Shunichi Futatsumori, Kazuyuki Morioka, Takashi Hikage, Tetsuya Sekiguchi, Manabu Yamamoto, Toshio Nojima
2019 International Applied Computational Electromagnetics Society Symposium in Miami, ACES-Miami 2019, 10 May 2019
© 2019 ACES. Wireless avionics intra-communication (WAIC) systems are operated at the same frequency bands as aircraft radio altimeters, i.e., 4,200-4,400 MHz. The coexistence conditions of WAIC systems and radio altimeters are investigated in detail with respect to electromagnetic compatibility. Firstly, the 4-GHz electromagnetic field around a three-dimensional Airbus A320 aircraft model is obtained through large-scale finite-difference time-domain analysis. Then, a transmitting antenna is modeled at the center of the aircraft at window height. Finally, the point source transmitting power at the geometrical center of the aircraft is estimated for the coexistence investigation.

FDTD法とレイトレースのハイブリッド3D解析を用いた都市環境モデルの伝搬損失推定
吉江明花, 山岸誠知, 日景隆
電子情報通信学会大会講演論文集(CD-ROM), 05 Mar. 2019, Japanese

大規模FDTD解析を用いた4.4GHz帯機外WAICシステム設計のための伝搬損失推定
関口徹也, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 森岡和行, 河村暁子, 米本成人
電子情報通信学会大会講演論文集(CD-ROM), 05 Mar. 2019, Japanese

透明ファントムを用いた埋込み金属プレートによるSAR上昇の実験的評価
伊藤涼音, 松田映美, 日景隆, 野島俊雄, 長岡智明, 渡邊聡一
電子情報通信学会大会講演論文集(CD-ROM), 05 Mar. 2019, Japanese

スモールオフィスにおける26GHz帯の伝搬損失特性推定
吉江明花, 山岸誠知, 日景隆, 久野伸晃, 中村光貴, 山田渉, 鷹取泰司
電子情報通信学会大会講演論文集(CD-ROM), 05 Mar. 2019, Japanese

垂直面電波到来角を考慮した人体遮蔽測定
佐藤彰弘, 緒方大悟, 木村翔, 表英毅, 日景隆
電子情報通信学会大会講演論文集(CD-ROM), 05 Mar. 2019, Japanese

Investigation on heating of the implant metal exposed to HF-EMF due to wireless power transfer
Shinto Son, Emi Matsuda, Takashi Hikage, Toshio Nojima
2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019, 01 Mar. 2019
© 2019 URSI. All rights reserved. With regard to the electromagnetic field (EMF) emitted from wireless communication devices, international radio radiation protection guidelines for human exposure to EMF have been established by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) [1] and the Institute of Electrical and Electronic Engineers (IEEE) [2]. These guidelines provide no quantitative discussions about their relevance to humans with metallic objects embedded in their bodies. It is very important to estimate the amount of exposure that users with metallic implants will experience. Some papers regarding interaction of radio frequency (RF) EMF and metallic implants have been published, and studies on the EMF exposure of users with passive metallic implants have reported measurements and numerical estimations [3], [4].

A Large Scale FDTD Analysis of Propagation Characteristics for Wireless Link Design of 4.4 GHz-Band WAIC Installed on Passenger Aircraft
T. Sekiguchi, T. Hikage, S. Futatsumori, A. Kohmura, N. Yonemoto
2018 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2018 - Proceedings, 04 Jan. 2019
© 2018 IEEE. Aim of this study is to develop an accurate and reliable method for estimating propagation characteristics inside and outside aircraft cabin so as to advance wireless link design for Wireless Avionics Intra-Communication (WAIC) system. This paper estimates propagation characteristics from inside cabin to exterior mounted antenna of WAIC system installed on a passenger aircraft (Airbus 320-200 model). EMF distributions excited by a 4.4 GHz wireless transmitter inside cabin are analyzed and fundamental characteristics for the WAIC system are derived from the analysis results.

Numerical Estimation on Indoor Propagation Characteristics for RF Wireless Power Transfer
日景 隆
Proceedings of 2019 URSI Asia-Pacific Radio Science Conference, 2019
2019 - 2019, ［Internationally co-authored］

Investigation on Heating of the Implant Metal Exposed to HF-EMF due to Wireless Power Transfer
日景 隆
Proceedings of 2019 URSI Asia-Pacific Radio Science Conference, 2019
2019 - 2019

FDTD-Based Numerical Estimation of Human Body Blockage Characteristics in 26GHz Band Indoor Propagation
Masakazu Yamagishi, Takashi Hikage, Motoharu Sasaki, Mitsuki Nakamura, Yasushi Takatori
2018 48th European Microwave Conference, EuMC 2018, 20 Nov. 2018
© 2018 European Microwave Association. The aim of this study is to develop an accurate and reliable method of estimating propagation channels and propagation modelling so as to advance radio link design of fifth generation (5G) wireless systems. It was reported that in the high frequency bands used for 5G, shadow fading is large as is the loss due to human bodies. This paper elucidates the effects of human body blockage on 26 GHz-band propagation characteristics in an indoor environment. A novel method for estimating human body blockage characteristics based on large scale FDTD analysis is proposed. Electromagnetic field distributions inside an office environment created by a 26 GHz wireless transmitter are analysed and propagation characteristics are discussed.

Estimation of SAR Enhancement Due to Implant Metal Exposed to External Electromagnetic Waves
Emi Matsuda, Keita Sakakibara, Takashi Hikage, Manabu Yamamoto, Toshio Nojima
2018 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2018, 14 Nov. 2018
© 2018 IEEE. The RF exposure guidelines do recognize that an increased local SAR (Specific Absorption Rate) due to metallic implants is possible. In this study, the effect of implantable medical device in human torso region is examined. A simple flat torso phantom is used which a cardiac pacemaker model is implanted in. The local SAR dependencies due to exposure frequency bands were presented. Here, we estimate localized SAR at several candidate frequency bands for 5th generation wireless systems.

Interference Voltage Measurement in RF-WPT Band Using an Electro-Optic Converter for Implantable Cardiac Pacemaker EMI Assessment
日景隆, 松田映美, 山岸誠知, 東山潤司, 大西輝夫
電子情報通信学会技術研究報告, 12 Nov. 2018, Japanese

無線LANおよび5G周波数帯近傍ばく露条件における埋め込み金属プレートに起因するSAR上昇の実験的評価
松田映美, 日景隆, 山本学, 野島俊雄, 長岡智明, 渡邊聡一
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 27 Oct. 2018, Japanese

5G周波数帯における生体反応閾値評価のための電波ばく露装置開発
榊原慶太, 関口徹也, 日景隆
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 27 Oct. 2018, Japanese

FDTD解析を用いたマイクロ波帯無線電力伝送装置の屋内伝搬特性推定
山岸誠知, 日景隆, 山本学, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 27 Oct. 2018, Japanese

大規模FDTD解析を用いた航空機外におけるWAIC周波数帯伝搬特性推定
関口徹也, 日景隆, 山本学, 大宮学, 二ッ森俊一, 森岡和行, 河村暁子, 米本成人
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 27 Oct. 2018, Japanese

小児モデルを用いた26GHz帯での人体遮蔽特性推定
日景隆, 山岸誠知, 飴谷充隆, 黒川悟
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 27 Oct. 2018, Japanese

Numerical Estimation of Human Blockage Characteristics for 26GHz Band Radio Propagation using Large Scale FDTD Analysis
山岸 誠知, 日景 隆, 久野 伸晃, 中村 光貴, 山田 渉, 鷹取 泰司
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 06 Sep. 2018, Japanese

近傍ばく露条件における埋め込み金属プレートによるSAR上昇評価
松田映美, 日景隆, 山本学, 野島俊雄, 長岡智明, 渡邊聡一
電子情報通信学会大会講演論文集(CD-ROM), 28 Aug. 2018, Japanese

航空機電波高度計と航空機内データ通信の周波数共用基礎検討―小型航空機における電波高度計の地上放射特性測定―
二ッ森俊一, 宮崎則彦, 関口徹也, 日景隆, 野島俊雄
電子情報通信学会大会講演論文集(CD-ROM), 28 Aug. 2018, Japanese

Numerical Estimation of Indoor Propagation Characteristics for Microwave Wireless Power Transfer
山岸 誠知, 日景 隆, 榊原 慶太, 野島 俊雄
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan, 03 Jul. 2018, Japanese

Numerical Estimation of Indoor Propagation Characteristics for Microwave Wireless Power Transfer
山岸誠知, 日景隆, 榊原慶太, 野島俊雄
電子情報通信学会技術研究報告, 25 Jun. 2018, Japanese

Investigation on Heating of the Implant Metal Exposed to HF-EMF due to Wireless Power Transfer
松田映美, 日景隆, 野島俊雄
電子情報通信学会技術研究報告, 07 Jun. 2018, Japanese

Development of 28 GHz band exposure equipment for studies on biological effects exposed to millimeter-wave at 5th generation wireless systems candidate frequency band
榊原慶太, 日景隆, 山岸誠知
電子情報通信学会技術研究報告, 07 Jun. 2018, Japanese

Analysis of radar altimeter interference due to wireless avionics intra-communication systems by using large-scale FDTD method - Investigation on Airbus A320 class passenger aircraft
Futatsumori Shunichi, Morioka Kazuyuki, Kohmura Akiko, Yonemoto Naruto, Hikage Takashi, Sekiguchi Tetsuya, Yamamoto Manabu, Nojima Toshio
IEEE Conference Proceedings, 23 May 2018, English
? 2018 Applied Computational Electromagnetics Society (ACES). Radio altimeters and wireless avionics intra-communication (WAIC) systems are both operated at the frequency band 4,200 MHz-4,400 MHz. Hence, a detailed analysis is required for spectrum sharing in the same band. Firstly, a large-scale finite-difference time-domain analysis is performed to obtain the detailed characteristics of the electromagnetic field (EMF) around the three-dimensional Airbus A320 aircraft model, which assumes that a WAIC device is located inside the cabin. Then, the 4-GHz EMF propagation characteristics are evaluated based on the analyzed results. Finally, the methodology of the interference analysis is discussed based on the obtained EMF characteristics.

誘電体板付加によるパッチアレーアンテナの高利得化に関する基礎検討　　　　　　　　　　　　　　　
蒔苗匠馬, 本橋諄平, 日景隆, 山本学, 平賀健, 内田大誠
電子情報通信学会大会講演論文集(CD-ROM), 06 Mar. 2018, Japanese

積雪中に埋もれた人体に装着した携帯端末の電波伝搬特性　　　　　　　　　　　　　　　
表英毅, 藤井輝也, 日景隆
電子情報通信学会大会講演論文集(CD-ROM), 06 Mar. 2018, Japanese

FDTD解析を用いた26GHz帯での人体遮蔽特性推定　　　　　　　　　　　　　　　
山岸誠知, 日景隆, 佐々木元晴, 中村光貴, 鷹取泰司
電子情報通信学会大会講演論文集(CD-ROM), 06 Mar. 2018, Japanese

携帯電話周波数帯におけるネジ穴を考慮した埋め込み金属プレートによるSAR上昇推定　　　　　　　　　　　　　　　
松田映美, 日景隆, 山本学, 野島俊雄, 長岡智明, 渡邊聡一
電子情報通信学会大会講演論文集(CD-ROM), 06 Mar. 2018, Japanese

大規模FDTD解析を用いた4.4GHz帯機外WAICシステム設計のための伝搬特性推定　　　　　　　　　　　　　　　
関口徹也, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電子情報通信学会大会講演論文集(CD-ROM), 06 Mar. 2018, Japanese

Temperature Increase on Implantable Medical Device Inside Human Body Due to External Electromagnetic Waves : HF-WPT and 5G Cellular Frequency Bands　　　　　　　　　　　　　　　
日景 隆, 大勝 隆平, 井山 隆弘, 大西 輝夫
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 02 Mar. 2018, Japanese

Temperature Increase on Implantable Medical Device Inside Human Body Due to External Electromagnetic Waves: HF-WPT and 5G Cellular Frequency Bands-　　　　　　　　　　　　　　　
日景隆, 大勝隆平, 井山隆弘, 大西輝夫
電子情報通信学会技術研究報告, 23 Feb. 2018, Japanese

Evaluation of Aircraft Cabin- to-Exterior Propagation Characteristics for 4.4 GHz-band WAIC Systems using a Large Scale FDTD Analysis　　　　　　　　　　　　　　　
関口 徹也, 日景 隆, 山本 学, 野島 俊雄, 二ッ森 俊一, 河村 暁子, 米本 成人
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 18 Jan. 2018, Japanese

Evaluation of Aircraft Cabin-to-Exterior Propagation Characteristics for 4.4GHz-band WAIC Systems using a Large Scale FDTD Analysis　　　　　　　　　　　　　　　
関口徹也, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電子情報通信学会技術研究報告, 11 Jan. 2018, Japanese

Numerical Estimation on Human Body Blockage Characteristics of 26GHz Band Indoor Propagation Using FDTD Analysis
日景 隆
Proceedings of the 48th European Microwave Conference, 2018
2018 - 2018

Numerical estimation of SAR enhancement due to implantable medical device inside human body exposed to external electromagnetic waves - 5G cellular candidate frequency bands -
日景 隆
Proceedings of BioEM 2018, 2018
2018 - 2018

Numerical Estimation on Human Body Blockage Characteristics for 26GHz Band Indoor Propagation
日景 隆
Proceedings of Vietnam-Japan International Symposium on Antennas and Propagation, 2018
2018 - 2018

A Large Scale FDTD Analysis of Propagation Characteristics for Wireless Link Design of 4.4 GHz-band WAIC Installed on Passenger Aircraft
日景 隆
Proceedings of 2019 IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting, 2018
2018 - 2018

Microwave Electromagnetic Field Characteristic Inside Carbon Fiber Reinforced Plastic Structures Evaluation Based on Reverberation Chamber and Human Phantom
日景 隆
Proceedings of 2018 IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting, 2018
2018 - 2018

Microwave electromagnetic field characteristic evaluations in aircrafts containing lossy materials based on quality factor of a reverberation chamber　　　　　　　　　　　　　　　
Shunichi Futatsumori, Takashi Hikage
2017 International Symposium on Antennas and Propagation, ISAP 2017, 19 Dec. 2017
? 2017 IEEE. The effects of electromagnetic lossy materials such as humans, on the electromagnetic field (EMF) characteristics of an aircraft are evaluated using finite-difference time-domain analyses and experiments conducted in a reverberation chamber. This study aims to confirm the EMF reduction effect, through measurements. The results of a large-scale finite-difference time-domain analysis conducted on a model of the B777-200 aircraft with occupants show a reduction in the electric field strength inside the cabin. The EMF loss due to a human phantom is measured quantitatively using a reverberation chamber, between 500 MHz and 6 GHz. The measured quality factor is found to be reduced by 55% when using a full-sized human phantom, which is lower than of the value measured at 2.1 GHz, without using a phantom.

大規模FDTD解析を用いた機外WAICシステムの4.4GHz帯電波伝搬特性推定　　　　　　　　　　　　　　　
関口徹也, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 28 Oct. 2017, Japanese

レイトレーシング解析を用いた26GHz帯電波のオフィス内伝播特性推定　　　　　　　　　　　　　　　
山岸誠知, 日景隆, 山本学, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 28 Oct. 2017, Japanese

3D‐FEMシミュレーションを用いたEV充電WPT機器による植込み型医療器EMI評価法の基礎検討　　　　　　　　　　　　　　　
佐藤尚樹, 日景隆, 山本学, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 28 Oct. 2017, Japanese

2GHz帯携帯無線端末使用時における頭部植込み型医療機周辺の局所SAR分布に関する偏波依存性　　　　　　　　　　　　　　　
進藤和輝, 松田映美, 日景隆, 山本学, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 28 Oct. 2017, Japanese

近傍ばく露における埋め込み金属プレートによるSAR上昇の実験的評価　　　　　　　　　　　　　　　
松田映美, 日景隆, 山本学, 野島俊雄, 長岡智明, 渡邊聡一
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 28 Oct. 2017, Japanese

EAS機器による植込み型医療機器EMIの実験的評価法　　　　　　　　　　　　　　　
近藤研, 日景隆, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 28 Oct. 2017, Japanese

Numerical Estimation on Local SAR Enhancement in Considering Combined Exposures to Cellular Radio and Implanted Visual Prosthesis Featuring Wireless Power Transfer in Human Head
進藤 和輝, 松田 映美, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 17 Oct. 2017, Japanese

Numerical Estimation on Local SAR Enhancement in Considering Combined Exposures to Cellular Radio and Implanted Visual Prosthesis Featuring Wireless Power Transfer in Human Head　　　　　　　　　　　　　　　
進藤和輝, 松田映美, 日景隆, 野島俊雄
電子情報通信学会技術研究報告, 10 Oct. 2017, Japanese

Active implantable medical device EMI estimation for EV-charging WPT system based on 3D full-wave analysis　　　　　　　　　　　　　　　
Hikage Takashi, Yamagishi Masakazu, Shindo Kazuki, Nojima Toshio
IEEE Conference Proceedings, 11 Jul. 2017, English
? 2017 IEEE. A numerical assessment methodology of active implantable pacemaker EMI triggered by wireless power transfer system for electric vehicle charging is presented. A numerical model that consists of electric vehicle wireless power transfer system and a human phantom is developed and used in the simulation. The interference voltages induced at the implantable pacemaker model are obtained using three dimensional full-wave numerical simulations based upon the finite element method. We assume realistic exposure scenarios, when the orientation and location of the human are varied, in order to develop conservative estimates of the interference voltage.

Aircraft electromagnetic field estimation for wireless avionics intra-communication band using large-scale FDTD analysis - Field estimation of A320 class passenger aircraft at 4 GHz band　　　　　　　　　　　　　　　
Futatsumori Shunichi, Morioka Kazuyuki, Kohmura Akiko, Yonemoto Naruto, Hikage Takashi, Yahagi Kanji, Shirafune Masami, Yamamoto Manabu, Nojima Toshio, Narahashi Shoichi
IEEE Conference Proceedings, 01 May 2017, English
? 2017 ACES. Electromagnetic compatibly (EMC) is required to be investigated for newly introduced on-board Wireless Avionics Intra-Communication (WAIC) systems. In this paper, the feasibility of the detailed electromagnetic field (EMF) estimation method for the Airbus A320 class passenger aircraft at 4 GHz band is discussed. Firstly, the three-dimensional analysis model based on Airbus A320-200 aircraft is developed for the EMF estimation using the large-scale finite-difference time-domain (FDTD) method. Then, the material constants and the FDTD analysis parameters are discussed. Finally, the analyzed EMF characteristics confirm the effectiveness of the EMC investigation at WAIC band using the numerical analysis.

Active implantable medical device EMI assessment for wireless power transfer
日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 28 Apr. 2017, Japanese

Active implantable medical device EMI assessment for wireless power transfer
日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 28 Apr. 2017, Japanese

Statistical analysis method of radio propagation path loss for gas-smart meters in a built-up area based on large-scale FDTD simulation　　　　　　　　　　　　　　　
Shirafune Masami, Hikage Takashi, Shindo Kazuki, Narahashi Shoichi, Nojima Toshio, Tsuchiya Sota, Kawata Takuya
IEEE Conference Proceedings, 26 Apr. 2017, English
? 2017 IEEE. This paper presents a large-scale Finite-Difference Time-Domain (FDTD) simulation as a prediction method for radio propagation characteristics for multi-hop communication of gas-smart meters in a built-up area. The frequency bands used in the simulations is 920 MHz-bands. By using the FDTD method to obtain precise and comprehensive results in multi-reflective environment, wave propagation from the gas-smart meters are observed and path loss characteristics are estimated statistically. Obtained larger path loss for the gas-smart meter in the built-up area compared with other propagation model, such as cellular communication, was more noticeable, and it is important for these effects need to be considered in the wireless link planning.

Active implantable medical device EMI assessment for wireless power transfer　　　　　　　　　　　　　　　
日景隆, 野島俊雄
電子情報通信学会技術研究報告, 21 Apr. 2017, Japanese

Numerical Estimation of Radio Propagation Characteristics for 26GHZ Band Communication System using Large Scale FDTD Analysis and 3D Laser Scanner
山岸 誠知, 日景 隆, 猪又 稔, 佐々木 元晴, 中村 光貴, 鷹取 泰司
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 20 Apr. 2017, Japanese

FEM simulation of induced interference voltage at implantable cardiac pacemaker due to wireless power transfer in HF-band　　　　　　　　　　　　　　　
Naoki Tanaka, Takashi Hikage, Juan C?rcoles, Toshio Nojima
ISAP 2016 - International Symposium on Antennas and Propagation, 17 Jan. 2017
? 2016 IEICE. A novel numerical Wireless Power Transfer (WPT)/Active Implantable Medical Device-EMI estimation methodology based upon finite element method analysis is presented. This assessment methodology can be applied to both Mobile/Portable-WPT system and electric-vehicle-WPT system. Here, an example for HF-band magnetic resonance type WPT is introduced. Simulated example includes different exposure scenarios in order to estimate the maximum interference voltage.

Large-scale FDTD analysis of 4.4 GHz-band propagation characteristics in aircraft cabin　　　　　　　　　　　　　　　
Kanji Yahagi, Masami Shirafune, Takashi Hikage, Manabu Yamamoto, Toshio Nojima, Shoichi Narahashi, Syunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto
ISAP 2016 - International Symposium on Antennas and Propagation, 17 Jan. 2017
? 2016 IEICE. Electromagnetic field (EMF) distributions generated by a 4.4 GHz-band wireless transmitter used in Wireless Avionics Intra Communications (WAIC) technology inside an aircraft cabin are analyzed and fundamental propagation characteristics are discussed from the analysis results. This paper uses FDTD method and a large-scale parallel computing technique to achieve calculation of whole aircraft (Airbus A320-200 model) including wings.

Aircraft Electromagnetic Field Estimation for Wireless Avionics Intra-Communication Band Using Large-Scale FDTD Analysis　　　　　　　　　　　　　　　
2017 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM - ITALY (ACES), 2017

Wireless Avionics Intra‐Communication周波数帯における航空機内伝搬特性の数値解析
矢萩幹人, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 05 Nov. 2016, Japanese

EAS機器による植込み型医療機器EMI試験のための近傍磁界分布評価
橘友和, 日景隆, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 05 Nov. 2016, Japanese

大規模FDTDシミュレーションを用いた航空機GPS装置への干渉経路損失推定
白船雅巳, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 05 Nov. 2016, Japanese

光ファイバセンサを用いた近傍界ばく露時の埋め込み金属プレートによるSAR上昇率評価
田中尚樹, 日景隆, 山本学, 野島俊雄, 長岡智明, 渡邊聡一
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 05 Nov. 2016, Japanese

閉空間内における年齢・性別の異なる数値人体のSAR推定
佐藤尚樹, 日景隆, 山本学, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 05 Nov. 2016, Japanese

2GHz帯携帯無線端末使用時における頭部植込み型医療機周辺の局所SAR分布推定
進藤和輝, 日景隆, 山本学, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 05 Nov. 2016, Japanese

Measurement Set-up of Interference Voltage in Cellular Band Using an Electro-Optic Converter for Implantable Cardiac Pacemaker EMI Assessment
田中 尚樹, 日景 隆, 野島 俊雄, 井山 隆弘, 大西 輝夫
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 15 Sep. 2016, Japanese

Measurement Set-up of Interference Voltage in Cellular Band Using an Electro-Optic Converter for Implantable Cardiac Pacemaker EMI Assessment
田中尚樹, 日景隆, 野島俊雄, 井山隆弘, 大西輝夫
電子情報通信学会技術研究報告, 08 Sep. 2016, Japanese

下顎骨骨折治療用埋め込み金属プレート空隙部におけるSAR上昇の実験的推定
田中尚樹, 日景隆, 野島俊雄, 長岡智明, 渡邊聡一
電子情報通信学会大会講演論文集(CD-ROM), 06 Sep. 2016, Japanese

A320型航空機モデルを用いたWAIC周波数帯機内電波伝搬特性の推定
矢萩幹人, 白船雅巳, 日景隆, 山本学, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電子情報通信学会大会講演論文集(CD-ROM), 06 Sep. 2016, Japanese

Identification and functional analysis of SVP ortholog in herbaceous perennial plant Gentiana triflora: Implication for its multifunctional roles　　　　　　　　　　　　　　　
Yamagishi Noriko, Kume Kohei, Hikage Takashi, Hikage Takashi, Takahashi Yui, Bidadi Haniyeh, Wakameda Keisuke, Saitoh Yasushi, Saitoh Yasushi, Yoshikawa Nobuyuki, Tsutsumi Ken-ichi, Tsutsumi Ken-ichi
Plant Science, Jul. 2016, English

Effect of Passengers' Absorption onto Multi-path Suppression for Wireless LAN Propagation Analysis in High-Speed Train Cars based on FDTD Method　　　　　　　　　　　　　　　
白船 雅巳, 日景 隆, 山本 学, 野島 俊雄, 猪又 稔, 佐々木 元晴, 山田 渉, 鬼沢 武
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 20 May 2016, Japanese

Effect of Passengers' Absorption onto Multi-path Suppression for Wireless LAN Propagation Analysis in High-Speed Train Cars based on FDTD Method
白船雅巳, 日景隆, 山本学, 野島俊雄, 猪又稔, 佐々木元晴, 山田渉, 鬼沢武
電子情報通信学会技術研究報告, 13 May 2016, Japanese

Estimation of RF leakage to oncoming train cars from wireless access point operating in bullet train passing through a tunnel
Masami Shirafune, Takashi Hikage, Manabu Yamamoto, Toshio Nojima, Minoru Inomata, Motoharu Sasaki, Wataru Yamada, Takeshi Onizawa
2015 International Symposium on Antennas and Propagation, ISAP 2015, 04 Apr. 2016
© 2015 The Institute of Electronics, Information and Comm.The aim of this study is to develop an accurate and reliable method of estimating field distributions in train cars so as to advance radio link design of wireless LANs operated inside the cars. This paper describes effects of absorption and shielding caused by a large number of passengers on propagation characteristics of RF leakage from wireless access point operating in a bullet train. Field distributions created by a 2.4 GHz-band wireless transmitter inside cars, when oncoming train cars are passing through a double track railway tunnel, are analyzed and propagation characteristics are determined from the analysis results.

Allelic variants of the esterase gene W14/15 differentially regulate overwinter survival in perennial gentian (Gentiana L.)　　　　　　　　　　　　　　　
HIKAGE Takashi, HIKAGE Takashi, YAMAGISHI Noriko, TAKAHASHI Yui, SAITOH Yasushi, YOSHIKAWA Nobuyuki, TSUTSUMI Ken‐ichi
Mol Genet Genomics, Apr. 2016, English

B-4-7 Measurement of Interference Voltage in Cellular Band Using an Electro-Optic Converter for Active Implantable Medical Device EMI assessment　　　　　　　　　　　　　　　
TANAKA Naoki, HIKAGE Takashi, NOJIMA Toshio, IYAMA Takahiro, ONISHI Teruo
Proceedings of the IEICE General Conference, 01 Mar. 2016, Japanese

B-1-39 A Large-Scale Numerical Analysis of In-car Propagation Characteristics and RF Leakage to Oncoming Car of Wireless LAN in a Train Considering Loss due to Passengers' RF absorption　　　　　　　　　　　　　　　
SHIRAFUNE Masami, HIKAGE Takashi, YAMAMOTO Manabu, NOJIMA Toshio, INOMATA Minoru, SASAKI Motoharu, YAMADA Wataru, ONIZAWA Takeshi
Proceedings of the IEICE General Conference, 01 Mar. 2016, Japanese

E/O変換器を用いた携帯電話周波数帯電波ばく露における植込み型医療機器EMI評価のための干渉誘起電圧測定　　　　　　　　　　　　　　　
田中尚樹, 日景隆, 野島俊雄, 井山隆弘, 大西輝夫
電子情報通信学会大会講演論文集(CD-ROM), 01 Mar. 2016, Japanese

乗客人体による損失を考慮した鉄道車両内無線LANにおける自車両内伝搬及び対向車両漏えい特性の大規模数値解析
白船雅巳, 日景隆, 山本学, 野島俊雄, 猪又稔, 佐々木元晴, 山田渉, 鬼沢武
電子情報通信学会大会講演論文集(CD-ROM), 01 Mar. 2016, Japanese

Estimation of Induced Interference Voltage at Implantable Cardiac Pacemaker Due to LF-band Wireless Power Transfer Coils　　　　　　　　　　　　　　　
田中 尚樹, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 12 Feb. 2016, Japanese

Estimation of Induced Interference Voltage at Implantable Cardiac Pacemaker Due to LF-band Wireless Power Transfer Coils　　　　　　　　　　　　　　　
田中尚樹, 日景隆, 野島俊雄
電子情報通信学会技術研究報告, 05 Feb. 2016, Japanese

Numerical Estimation of Local SAR Enhancement Due to Cellular Radio Usage for Implantable Visual Prosthesis Featuring Wireless Power Transfer Coil in Human Head　　　　　　　　　　　　　　　
進藤 和輝, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 28 Jan. 2016, Japanese

FEM Simulation of Induced Interference Voltage at Implantable Cardiac Pacemaker Due to Wireless Power Transfer in HF-band　　　　　　　　　　　　　　　
2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP), 2016

Experimental estimation of SAR enhancement due to two parallel implanted metal plates using a head phantom and thermograph　　　　　　　　　　　　　　　
Takashi Hikage, Naoki Tanaka, Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe
MOBIHEALTH 2015 - 5th EAI International Conference on Wireless Mobile Communication and Healthcare - Transforming Healthcare through Innovations in Mobile and Wireless Technologies, 22 Dec. 2015
Copyright ? 2015 ICST. The main objective of this study is to assess whether two parallel metal plates implanted in the head region could be expected to cause SAR enhancements under UHF near-field exposure. In this paper, we achieve precise temperature distribution measurements for a physical head phantom implanted with two metallic plates using thermograph. The phantom was newly manufactured using silicone rubber and carbon material. In the measured distributions, temperature increase due to the metallic plates was clearly observed in the gap of two metal plates region. Obtained measurement data can be used for validation study for further SAR estimations using numerical analysis.

Estimation of RF leakage to oncoming train cars from wireless access point operating in bullet train passing through a tunnel　　　　　　　　　　　　　　　
Masami Shirafune, Takashi Hikage, Manabu Yamamoto, Toshio Nojima, Minoru Inomata, Motoharu Sasaki, Wataru Yamada, Takeshi Onizawa
2015 International Symposium on Antennas and Propagation, ISAP 2015, 09 Nov. 2015, English, Oral presentation
? 2015 The Institute of Electronics, Information and Comm.The aim of this study is to develop an accurate and reliable method of estimating field distributions in train cars so as to advance radio link design of wireless LANs operated inside the cars. This paper describes effects of absorption and shielding caused by a large number of passengers on propagation characteristics of RF leakage from wireless access point operating in a bullet train. Field distributions created by a 2.4 GHz-band wireless transmitter inside cars, when oncoming train cars are passing through a double track railway tunnel, are analyzed and propagation characteristics are determined from the analysis results., [International presentation]

Numerical Estimation of 4.4GHz-band Propagation Characteristics in Aircraft Cabin Using Large-Scale FDTD analysis　　　　　　　　　　　　　　　
矢萩 幹人, 白船 雅巳, 日景 隆
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 04 Nov. 2015, Japanese

Estimation of Induced Interference Voltage at Implantable Cardiac Pacemaker Due to HF-band Wireless Power Transfer Coils　　　　　　　　　　　　　　　
田中 尚樹, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 04 Nov. 2015, Japanese

閉空間における生体電磁環境の安全性評価―電磁界解析に基づくエレベータ内ペースメーカEMI推定―　　　　　　　　　　　　　　　
HIKAGE TAKASHI, NOJIMA TOSHIO
電子情報通信学会大会講演論文集(CD-ROM), 25 Aug. 2015, Japanese

下顎骨骨折治療用埋め込み金属プレートによるSAR上昇の実験的推定　　　　　　　　　　　　　　　
TANAKA NAOKI, HIKAGE TAKASHI, NOJIMA TOSHIO, NAGAOKA TOMOAKI, WATANABE SOICHI
電子情報通信学会大会講演論文集(CD-ROM), 25 Aug. 2015, Japanese

B-20-3 Experimental Estimation for SAR Enhancement Due to Implanted metal Plates for Mandibular fracture　　　　　　　　　　　　　　　
TANAKA Naoki, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
Proceedings of the Society Conference of IEICE, 25 Aug. 2015, Japanese

BCS-1-1 An assessment for biological RF exposure safety in metallic enclosed environments : Numerical Estimation of EMI Impact by Mobile Radio on Implantable Cardiac Pacemakers in Elevator　　　　　　　　　　　　　　　
HIKAGE Takashi, NOJIMA Toshio
Proceedings of the Society Conference of IEICE, 25 Aug. 2015, Japanese

Assessment of Electromagnetic Interference Due to Electric Vehicle Wireless Power Transfer System on Active Implantable Medical Devices　　　　　　　　　　　　　　　
日景 隆, 白船 雅巳, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 12 Jun. 2015, Japanese

電気光変換器を用いた植込み型医療機器EMI評価のための干渉誘起電圧測定系　　　　　　　　　　　　　　　
HIKAGE TAKASHI, ONO TAISUKE, NOJIMA TOSHIO, IYAMA TAKAHIRO, HIGASHIYAMA JUNJI, ONISHI TERUO
電子情報通信学会大会講演論文集(CD-ROM), 24 Feb. 2015, Japanese

B-20-7 Experimental Estimation for SAR Enhancement Due to Implanted metal Plates Using Thermographic Method　　　　　　　　　　　　　　　
ONO Taisuke, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
Proceedings of the IEICE General Conference, 24 Feb. 2015, Japanese

B-4-22 Measurement Set-up Using an Electro-Optic Converter for Interference Voltage of Active Implantable Medical Devices EMI Assessment　　　　　　　　　　　　　　　
HIKAGE Takashi, ONO Taisuke, NOJIMA Toshio, IYAMA Takahiro, HIGASHIYAMA Junji, ONISHI Teruo
Proceedings of the IEICE General Conference, 24 Feb. 2015, Japanese

B-1-162 Estimation of RF Leakage to Oncoming Train Cars from Wireless Access Point Operating in High-Speed Train Passing Through a Tunnel　　　　　　　　　　　　　　　
SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, SASAKI Motoharu, YAMADA Wataru, SUGIYAMA Takatoshi
Proceedings of the IEICE General Conference, 24 Feb. 2015, Japanese

Propagation characteristic estimations of 2 GHz inter-car wireless links in high-speed train cars in a railway tunnel
Masami Shirafune, Takashi Hikage, Toshio Nojima, Motoharu Sasaki, Wataru Yamada, Takatoshi Sugiyama
ISAP 2014 - 2014 International Symposium on Antennas and Propagation, Conference Proceedings, 28 Jan. 2015, Institute of Electrical and Electronics Engineers Inc., English
28 Jan. 2015 - 28 Jan. 2015, The aim of this study is to develop an accurate and reliable method to estimate field distributions in train cars so as to advance radio link design of wireless LANs operating inside the cars. This paper describes effects of reflected waves due to tunnel wall and/or train passing on opposite track on propagation characteristics inside the high-speed train cars in a typical railway tunnel. Field distributions created by a 2.4 GHzband wireless transmitter inside cars are analyzed and exemplary propagation characteristics are determined statistically from large-scale numerical analysis results.

Propagation characteristic estimations of 2 GHz inter-car wireless links in high-speed train cars in a railway tunnel　　　　　　　　　　　　　　　
Masami Shirafune, Takashi Hikage, Toshio Nojima, Motoharu Sasaki, Wataru Yamada, Takatoshi Sugiyama
ISAP 2014 - 2014 International Symposium on Antennas and Propagation, Conference Proceedings, 01 Jan. 2015
? 2014 Institute of Antenna Engineers of Taiwan.The aim of this study is to develop an accurate and reliable method to estimate field distributions in train cars so as to advance radio link design of wireless LANs operating inside the cars. This paper describes effects of reflected waves due to tunnel wall and/or train passing on opposite track on propagation characteristics inside the high-speed train cars in a typical railway tunnel. Field distributions created by a 2.4 GHzband wireless transmitter inside cars are analyzed and exemplary propagation characteristics are determined statistically from large-scale numerical analysis results.

Local SAR in anatomical phantom implanted with metallic osteosynthesis plates in mandibular exposed to 2 GHz RF fields
Taisuke Ono, Takashi Hikage, Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe
IEEE iWEM 2014 - IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, 20 Nov. 2014, Institute of Electrical and Electronics Engineers Inc., English
20 Nov. 2014 - 20 Nov. 2014, RF exposure guidelines recognize that an increase in local SAR due to metallic implants is possible, depending upon the size and shape of the implant and the position. This study describes the local SAR calculations for an anatomical human with metallic osteosynthesis plates embedded in the mandibular zone exposed to 2GHz RF fields
FDTD analysis is applied. The main objective is to assess whether combination of two metallic plates aligned in parallel in the head region could be expected to cause SAR enhancements under near-field exposure condition at 2 GHz.

Numerical estimations of propagation characteristics and interference path loss due to personal electric device in a commercial aircraft cabin
Takashi Hikage, Masami Shirafune, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto
IEEE iWEM 2014 - IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, 20 Nov. 2014, Institute of Electrical and Electronics Engineers Inc., English
20 Nov. 2014 - 20 Nov. 2014, Electromagnetic field distributions established in a commercial aircraft, Boeing 777 class large passenger aircraft, due to a personal electric device are evaluated. We use FDTD technique and a large-scale parallel computing technique to precisely estimate the EMF distributions. In order to evaluate EMF characteristics including the whole structure of the aircraft such as the wings and engines, the dimensions of the aircraft model used in the analysis are as accurate as possible. Based on field distribution analyses, interference path loss for aircraft communication and navigation receivers from a 2 GHz band wireless transmitter inside the cabin are obtained statistically.

強制照射・サーモグラフィ法を用いた埋め込み金属プレートによるSAR上昇の実験的推定　　　　　　　　　　　　　　　
小野泰伴, 日景隆, 野島俊雄, 長岡智明, 渡邊聡一
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 25 Oct. 2014, Japanese

HF帯ワイヤレス電力伝送コイル近傍における植込み型心臓ペースメーカ干渉誘起電圧のFEM解析―心房・心室リードの比較―　　　　　　　　　　　　　　　
政木遥, 小野泰伴, 日景隆, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 25 Oct. 2014, Japanese

電力伝送コイルの位置ずれを考慮した人工視覚システム埋め込み人体の局所SAR推定　　　　　　　　　　　　　　　
日景隆, 小野泰伴, 野島俊雄, 米澤栄二, 大澤孝治
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 25 Oct. 2014, Japanese

FDTD解析を用いた航空機客室‐機上アンテナ間の経路損失評価　　　　　　　　　　　　　　　
白船雅巳, 日景隆, 野島俊雄, 二ッ森俊一, 河村暁子, 米本成人
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 25 Oct. 2014, Japanese

Evaluation of effects on electromagnetic field characteristics inside aircraft due to phenol internal structures using a reverberation chamber
Shunichi Futatsumori, Kazuyuki Morioka, Akiko Kohmura, Naruto Yonemoto, Masami Shirafune, Takashi Hikage, Toshio Nojima
IEEE International Symposium on Electromagnetic Compatibility, 20 Oct. 2014, Institute of Electrical and Electronics Engineers Inc., English
20 Oct. 2014 - 20 Oct. 2014, Effects on electromagnetic field (EMF) characteristics inside aircraft due to internal structures, such as phenol internal walls are experimentally investigated using a reverberation chamber. This is aiming to improve the accuracy of the numerical analysis method for the electromagnetic compatibility estimation of the Boeing 777 class large aircraft based on finite-difference time-domain (FDTD) technique. Firstly, the FDTD analysis results of B777-200ER aircraft are compared with that of measured results. The dependencies of material constants of the aircraft model are briefly discussed. Secondly, the EMF loss due to the phenol walls is measured quantitatively using the reverberation chamber. The performance of the chamber is evaluated by the statistical analysis. The field uniformity evaluated by the measured electric field (E-field) strength is less than 3 dB between 500 MHz and 6 GHz. Next, the cumulative distribution function of the measured E-field strength is in good agreement with the theoretical Rayleigh distribution. Finally, the measured quality factor, which is reduced by 20 % at 2 GHz and 25 % at 5 GHz, confirms the loss of EMF due to the phenol walls.

Numerical Analysis of Local SAR of Human Implanted with Visual Prosthesis Featuring Wireless Power Transfer Coil in Head　　　　　　　　　　　　　　　
日景 隆, 小野 泰伴, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 15 Oct. 2014, Japanese

An Estimation on Induced Voltage at Implantable Cardiac Pacemaker due to Magnetic Resonant Wireless Power Transfer Coils Using Finite Element Method　　　　　　　　　　　　　　　
小野 泰伴, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 15 Oct. 2014, Japanese

Numerical Analysis of Local SAR of Human Implanted with Visual Prosthesis Featuring Wireless Power Transfer Coil in Head　　　　　　　　　　　　　　　
HIKAGE TAKASHI, ONO TAISUKE, NOJIMA TOSHIO, YONEZAWA EIJI, OSAWA KOJI
電子情報通信学会技術研究報告, 08 Oct. 2014, Japanese
This study describes local specific absorption rate (SAR) calculations for anatomical human implanted with visual prosthesis featuring wireless power transfer (WPT) coil in head. A numerical estimation model that consists of a human head and an internally implanted component of the visual prosthesis including the WPT coil is constructed. By using Finite-difference time-domain (FDTD) analysis, electromagnetic fields distribution inside the human head is calculated and peak values of 10g-averaged SAR are evaluated.

An Estimation on Induced Voltage at Implantable Cardiac Pacemaker due to Magnetic Resonant Wireless Power Transfer Coils Using Finite Element Method　　　　　　　　　　　　　　　
ONO TAISUKE, HIKAGE TAKASHI, NOJIMA TOSHIO
電子情報通信学会技術研究報告, 08 Oct. 2014, Japanese
A numerical assessment methodology of active implantable medical device (implantable cardiac pacemaker / implantable cardioverter defibrillator) EMI triggered by magnetic resonance wireless power transmission (WPT) antennas is discussed. A numerical estimation model that consists of magnetic resonant coils and a human torso phantom including a pacemaker model is constructed. By using Finite element method (FEM), interference voltage induced at the connector of the pacemaker inside the human phantom is calculated. We consider, as an example, magnetic resonance WPT antennas operating on HF frequency band in this paper.

トンネル通過時の高速鉄道車両内2GHz帯電波の伝搬推定　　　　　　　　　　　　　　　
白船雅巳, 日景隆, 野島俊雄, 佐々木元晴, 山田渉, 杉山隆利
電子情報通信学会大会講演論文集(CD-ROM), 04 Mar. 2014, Japanese

航空機内構造物が内部電磁界伝搬特性に及ぼす影響―フェノール内壁を付加した電波反射箱の構造体Q値測定評価―　　　　　　　　　　　　　　　
二ッ森俊一, 森岡和行, 河村暁子, 米本成人, 白船雅巳, 日景隆, 野島俊雄
電子情報通信学会大会講演論文集(CD-ROM), 04 Mar. 2014, Japanese

非接触充電器による植込み型医療機器EMIのin vitro試験　　　　　　　　　　　　　　　
日景隆, 白船雅巳, 野島俊雄, 藤本裕, 岩井洋
電子情報通信学会大会講演論文集(CD-ROM), 04 Mar. 2014, Japanese

金属プレート埋め込みファントムの2GHz帯SARおよび温度上昇推定　　　　　　　　　　　　　　　
小野泰伴, 日景隆, 野島俊雄, 長岡智明, 渡邊聡一
電子情報通信学会大会講演論文集(CD-ROM), 04 Mar. 2014, Japanese

非接触電力伝送コイル付人工視覚システム埋め込み人体の局所SAR推定　　　　　　　　　　　　　　　
日景隆, 小野泰伴, 野島俊雄, 米澤栄二, 大澤孝治
電子情報通信学会大会講演論文集(CD-ROM), 04 Mar. 2014, Japanese

BI-4-4 In vitro Assessments of Active Implantable Medical Devices EMI from Radio Wave Emitted by Wireless Power Transfer Devices　　　　　　　　　　　　　　　
HIKAGE Takashi, SHIRAFUNE Masami, NOJIMA Toshio, FUJIMOTO Hiroshi, IWAI Hiroshi
Proceedings of the IEICE General Conference, 04 Mar. 2014, Japanese

B-4-40 SAR & Temperature Elevation Estimations for a Phantom Model Implanted with Metal Plates Exposed to 2GHz Radio-Waves　　　　　　　　　　　　　　　
ONO Taisuke, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
Proceedings of the IEICE General Conference, 04 Mar. 2014, Japanese

B-4-34 Numerical Analysis of Local SAR of Human Model Implanted with Visual Prosthesis Featuring Wireless Power Transfer Coil in Head　　　　　　　　　　　　　　　
HIKAGE Takashi, ONO Taisuke, NOJIMA Toshio, YONEZAWA Eiji, OSAWA Kouji
Proceedings of the IEICE General Conference, 04 Mar. 2014, Japanese

B-4-4 Effects on Electromagnetic Field Characteristics Inside Aircrafts Due to Internal Structures : Measurement of Quality Factor of Cubic Reverberation Chamber With Phenol Internal Walls　　　　　　　　　　　　　　　
FUTATSUMORI Shunichi, MORIOKA Kazuyuki, KOHMURA Akiko, YONEMOTO Naruto, SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio
Proceedings of the IEICE General Conference, 04 Mar. 2014, Japanese

B-1-12 Propagation Characteristic Estimations of 2 GHz Intra-Car Wireless Links in High-Speed Train Cars in Railway Tunnel　　　　　　　　　　　　　　　
SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, SASAKI Motoharu, YAMADA Wataru, SUGIYAMA Takatoshi
Proceedings of the IEICE General Conference, 04 Mar. 2014, Japanese

Propagation Characteristic Estimations of 2.4 GHz Inter-Car Wireless Links in High-Speed Train Cars in Railway Tunnel　　　　　　　　　　　　　　　
日景 隆, 白船 雅巳, 野島 俊雄
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 06 Feb. 2014, Japanese

Propagation Characteristic Estimations of 2.4 GHz Inter-Car Wireless Links in High-Speed Train Cars in Railway Tunnel　　　　　　　　　　　　　　　
HIKAGE TAKASHI, SHIRAFUNE MASAMI, NOJIMA TOSHIO, SASAKI MOTOHARU, YAMADA WATARU, SUGIYAMA TAKATOSHI
電子情報通信学会技術研究報告, 30 Jan. 2014, Japanese
The aim of this study is to develop an accurate and reliable method of estimating field (EMF) distributions in train cars so as to advance radio link design of wireless LANs operated inside the cars. Previously, the authors investigated propagation characteristics for wireless LAN inside a typical commuter train and high-speed train using FDTD technique and a large-scale parallel computing technique. This paper describes propagation characteristic of Inter-Car wireless links in high-speed train in railway tunnel. EMF distributions created by a 2.4GHz wireless transmitter inside cars are analyzed and propagation characteristics are determined from the analysis results.

Electromagnetic field propagation characteristics of boeing 777 class large passenger aircraft-Numerical estimation and measurement results at 2 Ghz band　　　　　　　　　　　　　　　
Shunichi Futatsumori, Kazuyuki Morioka, Akiko Kohmura, Narutoc Yonemoto, Masami Shirafune, Takashi Hikage, Toshio Nojima
Annual Review of Progress in Applied Computational Electromagnetics, 01 Jan. 2014
Electromagnetic field (EMF) propagation characteristics including the whole body of a Boeing 777 class large passenger aircraft is analyzed by a parallel computing finite-difference time-domain technique. The analyzed EMF distributions in the aircraft cabin are in good agreement with measured distributions. The developed EMF analysis method can be applied for electromagnetic compatibility evaluations of aircrafts.

Evaluation of effects on electromagnetic field characteristics inside aircraft due to phenol internal structures using a reverberation chamber　　　　　　　　　　　　　　　
Shunichi Futatsumori, Kazuyuki Morioka, Akiko Kohmura, Naruto Yonemoto, Masami Shirafune, Takashi Hikage, Toshio Nojima
IEEE International Symposium on Electromagnetic Compatibility, 01 Jan. 2014
? 2014 IEEE.Effects on electromagnetic field (EMF) characteristics inside aircraft due to internal structures, such as phenol internal walls are experimentally investigated using a reverberation chamber. This is aiming to improve the accuracy of the numerical analysis method for the electromagnetic compatibility estimation of the Boeing 777 class large aircraft based on finite-difference time-domain (FDTD) technique. Firstly, the FDTD analysis results of B777-200ER aircraft are compared with that of measured results. The dependencies of material constants of the aircraft model are briefly discussed. Secondly, the EMF loss due to the phenol walls is measured quantitatively using the reverberation chamber. The performance of the chamber is evaluated by the statistical analysis. The field uniformity evaluated by the measured electric field (E-field) strength is less than 3 dB between 500 MHz and 6 GHz. Next, the cumulative distribution function of the measured E-field strength is in good agreement with the theoretical Rayleigh distribution. Finally, the measured quality factor, which is reduced by 20 % at 2 GHz and 25 % at 5 GHz, confirms the loss of EMF due to the phenol walls.

Estimation of the electromagnetic fields excited by a cellular phone in a typical aircraft cabin　　　　　　　　　　　　　　　
Masami Shirafune, Takashi Hikage, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto
IEEE International Symposium on Electromagnetic Compatibility, 01 Jan. 2014
? 2014 The Institute of Electronics, Information and Communication Engineer.The aim of this study is to develop accurate and reliable estimation method of EMF distributions in aircraft that can contribute to numerical EMI assessment technique. Electromagnetic field distributions created by a cellular radio inside a cabin of aircraft are analyzed and propagation characteristics are discussed from the analysis results. We use FDTD technique and a large-scale parallel computing technique to precisely estimate the field distributions inside cabin of Boeing 777-200 aircraft model.

Numerical estimations of propagation characteristics and interference path loss due to personal electric device in a commercial aircraft cabin　　　　　　　　　　　　　　　
Takashi Hikage, Masami Shirafune, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto
IEEE iWEM 2014 - IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, 01 Jan. 2014
? 2014 IEEE.Electromagnetic field distributions established in a commercial aircraft, Boeing 777 class large passenger aircraft, due to a personal electric device are evaluated. We use FDTD technique and a large-scale parallel computing technique to precisely estimate the EMF distributions. In order to evaluate EMF characteristics including the whole structure of the aircraft such as the wings and engines, the dimensions of the aircraft model used in the analysis are as accurate as possible. Based on field distribution analyses, interference path loss for aircraft communication and navigation receivers from a 2 GHz band wireless transmitter inside the cabin are obtained statistically.

Local SAR in anatomical phantom implanted with metallic osteosynthesis plates in mandibular exposed to 2 GHz RF fields　　　　　　　　　　　　　　　
Taisuke Ono, Takashi Hikage, Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe
IEEE iWEM 2014 - IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, 01 Jan. 2014
? 2014 IEEE.RF exposure guidelines recognize that an increase in local SAR due to metallic implants is possible, depending upon the size and shape of the implant and the position. This study describes the local SAR calculations for an anatomical human with metallic osteosynthesis plates embedded in the mandibular zone exposed to 2GHz RF fields; FDTD analysis is applied. The main objective is to assess whether combination of two metallic plates aligned in parallel in the head region could be expected to cause SAR enhancements under near-field exposure condition at 2 GHz.

Implantable cardiac pacemaker EMI triggered by HF-band wireless power transfer coils　　　　　　　　　　　　　　　
Takashi Hikage, Masami Shirafune, Toshio Nojima
IEEE International Symposium on Electromagnetic Compatibility, 01 Jan. 2014
? 2014 The Institute of Electronics, Information and Communication Engineer.We introduce a numerical assessment methodology to understand the EMI imposed by coupled-resonant type wireless power transfer systems on active implantable medical devices (implantable cardiac pacemaker / cardioverter defibrillator). A numerical estimation model that consists of resonant coils and a human torso phantom with a pacemaker model is constructed. Numerical simulation based on the finite element method yields the interference voltage induced at the connector of the pacemaker inside the torso phantom. Our example assumes magnetic resonant coupling coils operating in the frequency band of 10 MHz.

A new improved electrode for the human body model: Application for EMI assessment of Active Implant Medical Devices　　　　　　　　　　　　　　　
Hiroshi Fujimoto, Takeshi Toyoshima, Takashi Hikage, Toshio Nojima
IEEE International Symposium on Electromagnetic Compatibility, 01 Jan. 2014
? 2014 The Institute of Electronics, Information and Communication Engineer.The newly developed electrode for human body model, which is used for evaluation of EMI to a cardiac Active Implant Medical Device (AIMD), is reported. The electrode consists of applying and monitoring of signal portion and reduces crosstalk and signal leakage in application of cardiac pacing and sensing. It is practical and sufficient means of simulating EMI effects to an AIMD.

Local SAR evaluation of anatomical human implanted with metallic osteosynthesis plates exposed to UHF radio waves　　　　　　　　　　　　　　　
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe
IEEE International Symposium on Electromagnetic Compatibility, 24 Dec. 2013
RF exposure guidelines recognize that an increase in local SAR (specific absorption rate) due to metallic implants is possible, depending upon the size and shape of the implant and the position. In this study, the effect of implanting metallic osteosynthesis plates in the human head region is examined by using FDTD analysis. The main objective is to simulate whether combination of two metallic plates aligned in parallel in the head region could be expected to cause SAR enhancements. An anatomical phantom model is used in which osteosynthesis plates of mandibular fractures are implanted. In the numerical modeling of the osteosynthesis plates, topological morphing operation is used. The peak 10-g averaged SAR dependencies in the mandibular zone are quantitatively investigated with metal plates of various sizes and shapes under far- and near-field exposure conditions. ? 2013 EMC Europe Foundation.

無線電力伝送コイル近傍界による植込み型医療機器EMIのFDTD解析　　　　　　　　　　　　　　　
小野泰伴, 日景隆, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 19 Oct. 2013, Japanese

列車内無線LAN電波の車車間伝搬に及ぼす車両間ドアの遮蔽影響推定―ドア窓の寸法と損失の関係―　　　　　　　　　　　　　　　
白船雅巳, 日景隆, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 19 Oct. 2013, Japanese

有限要素法を用いた磁界共振型ワイヤレス電力伝送コイル近傍における植込み型心臓ペースメーカ干渉誘起電圧の推定―単極・双極モードの比較―　　　　　　　　　　　　　　　
鈴木琢馬, 日景隆, 野島俊雄
電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 19 Oct. 2013, Japanese

In vitro assessment of EMI from RFID interrogator on implantable cardiac pacemakers and implantable cardioverter defibrillators　　　　　　　　　　　　　　　
Takashi Hikage, Masami Shirafune, Toshio Nojima, Hiroshi Fujimoto, Takeshi Toyoshima
2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings, 04 Sep. 2013
Electromagnetic interference (EMI) characteristics of implantable cardiac pacemakers and cardioverter defibrillators (ICDs) based on assessments of RFID interrogators are described in this paper. Examples of interrogators operating in various RF bands are tested to estimate EMI experienced by pacemakers and ICDs. The EMI test set-up and some experimental evaluation results for practical devices are shown. Observed characteristics of the EMI occurrence are discussed based upon the transmission radio wave specifications. ? 2013 IEICE.

Whole-body averaged SAR measurements using cylindrical-external field scanning for 2 GHz plane wave irradiation of human models　　　　　　　　　　　　　　　
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe
2013 7th European Conference on Antennas and Propagation, EuCAP 2013, 14 Aug. 2013
This paper presents measured whole-body averaged specific absorption rate (WB-SAR) values for human phantom models under 2GHz far-field exposure. Using cylindrical-external field scanning, we develop an experimental WB-SAR measurement system for far-field exposure. A key characteristic is that it can be easily applied to human phantoms that have different postures or sizes, because it is not necessary to determine the electromagnetic components distributed inside the phantom. The postured human phantoms used in this paper were designed from enhanced high-resolution numerical human models and fabricated from 2/3 muscle-equivalent tissue material consisting of carbon materials embedded in silicone. The measurement WB-SAR values for male adult and child human phantom were, under the ICNIRP reference level exposure condition, comparable with the numerical calculation results that have been reported. ? 2013 EurAAP.

Evaluation of Propagation Characteristics for Wireless LAN on Aircraft Considering the Wings　　　　　　　　　　　　　　　
SHIRAFUNE MASAMI, HIKAGE TAKASHI, NOJIMA TOSHIO, FUTATSUMORI SHUN'ICHI, KOMURA AKIKO, YONAMOTO NARUTO
電気学会電磁界理論研究会資料, 18 Jul. 2013, Japanese

Evaluation of Propagation Characteristics for Wireless LAN on Aircraft Considering the Wings　　　　　　　　　　　　　　　
SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Shunichi, KOHMURA Akiko, YONEMOTO Naruto
Technical report of IEICE. OPE, 11 Jul. 2013, Japanese
Demand for wireless broadband access services in long-distance transportations, such as trains and aircrafts, continues to grow. Recently, some airlines have begun in-flight call and in-flight wireless LAN access service. The final goal of this study is to develop an accurate and reliable numerical estimation tool of electromagnetic fields distributions inside aircraft so as to advance radio link design of wireless terminals operated inside the cabin. The authors previously proposed an EMF estimation method for an aircraft based on FDTD analysis and parallel computing. The EMF distributions established in the cabin of a Boeing 777- 200ER model due to a cellular radio were evaluated. In that modeling, the wings of the aircraft were not modeled in the analysis due to the limit of computational memory capability. This paper evaluates the propagation characteristics in cabin of Boeing 777-200ER by using newly developed numerical model of the aircraft which has the wings. In order to make the correct modeling of structures with details feasible, non-uniform gridding technique is employed. EMF distributions created by a 2 GHz band wireless transmitter inside the cabin are analyzed and propagation loss characteristics are obtained.

Inheritance of resistance to brown leaf spot disease in gentians　　　　　　　　　　　　　　　
NEKODUKA Syuuichi, HORAGUCHI Hiroaki, AKASAKA Shihio, CHIBA Ken‐ichi, HIKAGE Takashi, KAWAMURA Hiromi, NAKATSUKA Takashi, NISHIHARA Masahiro
J Gen Plant Pathol, May 2013, English

B-1-51 Numerical Estimation of RF Leakage from Wireless Access Point Operating in High-Speed Train Car　　　　　　　　　　　　　　　
SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi
Proceedings of the IEICE General Conference, 05 Mar. 2013, Japanese

B-4-11 Thermographic SAR Estimation in a Phantom Model lmplanted with Metal Plates Exposed to 2 GHz Radio-Waves　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
Proceedings of the IEICE General Conference, 05 Mar. 2013, Japanese

In vitro Assessment of EMI from RFID Interrogator on Implantable Cardiac Pacemakers/cardioverter defibrillators　　　　　　　　　　　　　　　
HIKAGE Takashi, KAWAMURA Yoshifumi, NOJIMA Toshio, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
電気学会研究会資料. EMC, 電磁環境研究会, 05 Mar. 2013, Japanese

FDTD Analysis of Shielding Effect of Connecting Doors for Wireless LAN Access Service in High-Speed Train Cars　　　　　　　　　　　　　　　
日景 隆, 白船 雅巳, 野島 俊雄
電子情報通信学会技術研究報告 : 信学技報, 23 Jan. 2013, Japanese

FDTD Analysis of Shielding Effect of Connecting Doors for Wireless LAN Access Service in High-Speed Train Cars　　　　　　　　　　　　　　　
HIKAGE Takashi, SHIRAFUNE Masami, OJIMA Toshio, YAMADA Wataru, KITA Naoki, SUGIYAMA Takatoshi
IEICE technical report. Antennas and propagation, 15 Jan. 2013, Japanese
The aim of this study is to develop an accurate and reliable method of estimating field (EMF) distributions in tram cars so as to advance radio link design of wireless LANs operated inside the cars. Previously, the authors investigated propagation characteristics for wireless LAN inside a typical commuter tram and high-speed tram using FDTD technique and a large-scale parallel computing technique. This paper describes shielding effects due to connecting doors on propagation characteristics inside the high-speed tram cars EMF distributions created by a 2.4GHz wireless transmitter inside cars are analyzed and propagation characteristics are determined from the analysis results. In order to estimate the shielding effect by the doors, we derive histograms of the electric field distributions throughout the whole interior of the cars.

Efficient haploid and doubled haploid production from unfertilized ovule culture of gentians (Gentiana spp.)　　　　　　　　　　　　　　　
DOI Hisako, HOSHI Nobue, YAMADA Eri, YOKOI Shuji, NISHIHARA Masahiro, HIKAGE Takashi, TAKAHATA Yoshihito
Breed Sci, 2013, English

Large-scale FDTD analysis to obtain precise propagation characteristics of in-flight wireless access service　　　　　　　　　　　　　　　
Takashi Hikage, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto
IEEE AFRICON Conference, 01 Jan. 2013
Electromagnetic field distributions created by a 2 GHz band wireless transmitter inside an aircraft cabin are analyzed and propagation characteristics are discussed from the analysis results. We use FDTD technique and a large-scale parallel computing technique to precisely estimate the field distributions inside cabin of a Boeing 777-200 aircraft model. In order to validate FDTD analysis results, the calculated electric field distribution is compared to actual field measurement in the aircraft cabin. Additionally, the absorption effect due to passengers can be considered. ? 2013 IEEE.

Numerical assessment method for implantable cardiac pacemaker EMI triggered by 10MHz-band wireless power transfer coils　　　　　　　　　　　　　　　
Takuma Suzuki, Takashi Hikage, Toshio Nojima
2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-BIO 2013 - Proceedings, 01 Jan. 2013
A numerical assessment methodology to understand the EMI imposed by magnetic resonance type wireless power transfer systems on active implantable medical devices (implantable cardiac pacemaker/cardioverter defibrillator) is introduced. A numerical estimation model that consists of magnetic resonant coils and a human torso phantom with a pacemaker model is constructed. Numerical simulation based on the finite element method yields the interference voltage induced at the connector of the pacemaker inside the torso phantom. Our example assumes magnetic resonance coils operating in the frequency band of 10 MHz. ? 2013 IEEE.

Numerical assessment methodology for active implantable medical device EMI due to magnetic resonance wireless power transmission antenna　　　　　　　　　　　　　　　
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, Eugenia Cabot
IEEE International Symposium on Electromagnetic Compatibility, 01 Dec. 2012
This paper introduces a numerical assessment methodology of the EMI triggered by magnetic resonance wireless power transmission antennas and imposed on active implantable medical devices such as implantable-cardiac pacemakers and cardioverter defibrillators. A numerical estimation model that consists of magnetic resonant coils and a human torso phantom is constructed. Interference voltage induced at the connector of the pacemaker inside the human phantom is calculated. We consider, as an example, magnetic resonance WPT antennas operating the frequency band of 10 MHz, with air-gap of less than 0.5 m. Finally, the calculated interference voltage is compared with the EMI characteristics obtained by in-vitro EMI experiments. ? 2012 IEEE.

EMI risk assessment of electromagnetic field from mobile phone in elevator cabin for implantable pacemaker　　　　　　　　　　　　　　　
Junji Higashiyama, Yoshiaki Tarusawa, Takashi Hikage, Toshio Nojima
IEEE International Symposium on Electromagnetic Compatibility, 01 Dec. 2012
The electromagnetic interference impact of a mobile phone to implantable medical device in an elevator cabin is discussed based on electric field distribution measurement data. To measure the field strength, a simulated elevator cabin is constructed according to industry standards, which conform to wheelchair use. The resultant measured field strength shows that there is no electric field strength that has the potential to yield electromagnetic interference between an implantable cardiac pacemaker and a mobile phone if the isolation distance recommended by the pacemaker user guidelines is maintained for the implanted cardiac pacemaker. ? 2012 IEEE.

Whole-body averaged SAR measurements of postured phantoms exposed to E-/H-polarized plane-wave using cylindrical field scanning　　　　　　　　　　　　　　　
Yoshifumi Kawamura, Takashi Hikage, Toshio Nojima, Tomoaki Nagaoka, Soichi Watanabe
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 01 Dec. 2012
The aim of this study is to achieve experimental estimation of whole-body averaged specific absorption rate (WB-SAR) of human models using the radiation-field scanning technique. The original relationship between the WB-SAR and the reference level of ICNIRP Guidelines [1] was obtained through the theoretical analyses using the simple geometrical or block structure. Recently, high resolution numerical simulations have become possible through the use of highspeed computers and high accuracy human phantoms based on magnetic resonance imaging [2], [3]. On the other hand, some experiments to investigate the same subject have been reported [4]. It is very important to obtain reliable measurement data that can contribute to the validation of recent precise computation-based estimations. ? 2012 IEICE.

Numerical estimations of the propagation characteristics of wireless links in high-speed train cars　　　　　　　　　　　　　　　
Takashi Hikage, Masami Shirafune, Toshio Nojima, Wataru Yamada, Takatoshi Sugiyama
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 01 Dec. 2012
Demand for wireless broadband access services in long-distance transportations continues to grow. Several railway companies have recently begun in-car wireless LAN services [1]. In order to advance the radio link design in support of such services, an accurate and reliable method for estimating the electromagnetic environment in actual situations is required. However, comprehensive on-site field measurements cost too much, and it is difficult to carry them out precisely. In addition, measurements must take account of the absorbing effects due to many passengers triggering the drawbacks of poor feasibility and repeatability. This study introduces an accurate and reliable method of estimating electromagnetic field (EMF) distributions in train cars so as to advance the radio link design of wireless LANs operated inside train cars. The authors previously proposed an EMF estimation method for a typical commuter train based on FDTD analysis and parallel computing [2]. This paper evaluates the propagation characteristics in a High-Speed Train Car (HSTC). Using newly developed numerical models of HSTC, which include many passengers, EMF distributions created by a 5.2 GHz wireless transmitter inside the HSTC are analyzed and propagation characteristics are evaluated. In order to estimate the effect of the absorption by the passengers' bodies, simplified histograms of the electric field distributions throughout the whole interior of the car are derived. ? 2012 IEICE.

Harmonic matching and reflecting amplifiers with 2nd and 3rd harmonic phase tuning　　　　　　　　　　　　　　　
Ken Hiraga, Takashi Hikage, Manabu Yamamoto, Toshio Nojima
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 01 Dec. 2012
Efficiency of power amplifiers has been a major issue in the field of wireless transmitters and microwave power transmitters. Accordingly, many techniques for high efficiency have been proposed [1][2]. The use of class-F amplifiers has been considered to be one of the most effective approaches at microwave or higher frequencies. The drain efficiency is 100% for ideal class-F operation with an infinite number of harmonics in operating waveforms [2]. Such operation is realized with complete load conditions [3]. ? 2012 IEICE.

Local SAR Estimation of Human Model Implanted with Medical Metal Plates in Head Exposed to UHF Electromagnetic Fields　　　　　　　　　　　　　　　
河村 由文, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 : 信学技報, 07 Sep. 2012, Japanese

Local SAR Estimation of Human Model Implanted with Medical Metal Plates in Head Exposed to UHF Electromagnetic Fields　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
IEICE technical report. Electromagnetic compatibility, 31 Aug. 2012, Japanese
The RF exposure guidelines do recognize that an increased local SAR (Specific Absorption Rate) due to metallic implants is possible, depending upon the size and shape of the implant and the position. In this study, the effect of medical metal plates in the head region is examined. An anatomical Japanese male adult and a simplified multi-layer flat model are used which the plates are implanted in mandibular zone. The local SAR dependencies due to the size variation of the metal plates were presented. In addition, a half-wave dipole antenna was used as an exposure source and the SAR in the near field was studied. The results indicated that some of the metal plates, under 2 GHz far-field and near-field exposure conditions, may cause a 37% increment of 10g averaged SAR.

B-1-22 Electric Characteristics of Cabin Sidewall Panel in Large Passenger Aircrafts : Dielectric Constant Measurements of Phenol FRP　　　　　　　　　　　　　　　
FUTATSUMORI Shunichi, KOHMURA Akiko, ISOZAKI Eiju, YONEMOTO Naruto, HIKAGE Takashi, NOJIMA Toshio
Proceedings of the Society Conference of IEICE, 28 Aug. 2012, Japanese

B-4-19 In vitro Assessments of Active Implantable Medical Devices EMI from Radio Wave Emitted by LTE Wireless Devices　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
Proceedings of the Society Conference of IEICE, 28 Aug. 2012, Japanese

磁界共振型ワイヤレス電力伝送アンテナによる植込み型医療機器EMIの数値評価法 (エレクトロニクスシミュレーション)　　　　　　　　　　　　　　　
鈴木 琢馬, 河村 由文, 日景 隆
電子情報通信学会技術研究報告 : 信学技報, 26 Jul. 2012, Japanese

大規模FDTD解析を用いた航空機における無線LAN電波の伝搬特性評価 (エレクトロニクスシミュレーション)　　　　　　　　　　　　　　　
木下 真樹, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 : 信学技報, 26 Jul. 2012, Japanese

Estimation of Propagation Characteristics of Wireless LAN on Aircraft Using Large Scale FDTD Analysis　　　　　　　　　　　　　　　
KINOSHITA Masaki, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Syunichi, KOHMURA Akiko, YONEMOTO Naruto
電気学会研究会資料. EMT, 電磁界理論研究会, 26 Jul. 2012, Japanese

Numerical Assessment Methodology for Active Implantable Medical Device EMI due to Magnetic Resonance Wireless Power Transmission Antenna　　　　　　　　　　　　　　　
SUZUKI Takuma, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
電気学会研究会資料. EMT, 電磁界理論研究会, 26 Jul. 2012, Japanese

Propagation Characteristic Estimations of Wireless Links in High-Speed Train Cars Based upon FDTD Analysis　　　　　　　　　　　　　　　
白船 雅巳, 日景 隆, 野島 俊雄
電子情報通信学会技術研究報告 : 信学技報, 25 Jul. 2012, Japanese

Numerical Assessment Methodology for Active Implantable Medical Device EMI due to Magnetic Resonance Wireless Power Transmission Antenna　　　　　　　　　　　　　　　
SUZUKI Takuma, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
電子情報通信学会技術研究報告. MWP, マイクロ波・ミリ波フォトニクス, 19 Jul. 2012, Japanese
This paper introduces a numerical assessment methodology of the EMI triggered by magnetic resonance wireless power transmission(WPT) antennas and imposed on active implantable medical devices such as implantable-cardiac pacemakers and cardioverter defibrillators. A numerical estimation model that consists of magnetic resonant coils and a human torso phantom is constructed. Interference voltage induced at the connector of the pacemaker inside the human phantom is calculated using Finite element method(FEM). We consider, as an example, magnetic resonance WPT antennas operating the frequency band of 10MHz.

Estimation of Propagation Characteristics of Wireless LAN on Aircraft Using Large Scale FDTD Analysis　　　　　　　　　　　　　　　
KINOSHITA Masaki, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Syunichi, KOHMURA Akiko, YONEMOTO Naruto
電子情報通信学会技術研究報告. MWP, マイクロ波・ミリ波フォトニクス, 19 Jul. 2012, Japanese
Recently, some airlines have begun in-flight wireless LAN service. The aim of this study is to develop an accurate and reliable method of estimating the electromagnetic field(EMF) distributions in aircraft cabins, which can contribute to advance the radio link design in support of such services. Previously, authors estimated propagation characteristics of cellular radio inside a typical aircraft cabin using a large scale FDTD computation. In this report, we estimate propagation characteristics of a 2.45GHz wireless LAN access point inside the cabin of a Boeing 777-200 model.

Propagation Characteristic Estimations of Wireless Links in High-Speed Train Cars Based upon FDTD Analysis　　　　　　　　　　　　　　　
SHIRAFUNE Masami, HIKAGE Takashi, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi
IEICE technical report. Antennas and propagation, 18 Jul. 2012, Japanese
The aim of this study is to develop an accurate and reliable method of estimating field (EMF) distributions in train cars so as to advance radio link design of wireless LANs operated inside the cars. This paper uses FDTD technique and a large-scale parallel computing technique to estimate the propagation characteristics of the high-speed train cars model. EMF distributions created by a 2.4GHz wireless transmitter inside cars are analyzed and propagation characteristics are determined from the analysis results. Additionally, in order to estimate the effect of the absorption by the passengers' bodies, we derive simplified histograms of the electric field distributions throughout the whole interior of the car.

Experimental Estimation of EMI from Electronic Article Surveillance on Implantable Cardiac Pacemakers and Implantable Cardioverter Defibrillators : Interference Distance and Clinical Estimation　　　　　　　　　　　　　　　
河村 由文, 日景 隆, 野島 俊雄
Transactions of Japanese Society for Medical and Biological Engineering, Jun. 2012, Japanese
Methods and results of in vitro experiments examining the electromagnetic interference (EMI) imposed on active implantable medical devices (AIMDs) by electronic article surveillance (EAS) systems are presented. Examined EAS systems include eleven models provided by four manufacturers. They are classified into four categories according to operating principle, and consist of one magnetic-type system, four acousto-magnetic type systems, five electromagnetic-type systems, and one microwave-type system. Examined AIMDs include five models of implantable cardiac pacemakers and five models of implantable cardioverter defibrillators (ICDs) provided by six manufacturers. These EAS systems and AIMDs are currently available in the Japanese market. The in vitro test system is based upon Irnich's flat torso phantom. The observed EMI on pacemakers is either missing pulses or undesirable generation of asynchronous pulses. The observed EMI on ICDs are inappropriate tachyarrhythmia detection and erroneous delivery of therapy. To summarize the results, in the worst case for pacemakers, interference occurred when approaching the EAS system up to 90 cm and entering the gate of the EAS system. The most significant effect was complete omission of pacing pulse and continuous generation of asynchronous pulses. These were observed when the pacemaker was set at maximum sensitivity. In the worst case for ICDs, interference occurred when approaching the EAS pedestal up to 90 cm within the gate. The most significant effect was inappropriate or inhibited tachyarrhythmia detection at 60 cm. These effects were drastically suppressed when the sensitivity was reduced and when the AIMD was far from the EAS system and magnetic field was attenuated. All AIMDs that experienced EMI returned to normal operation mode upon departing the EAS system.

Development of DNA markers that discriminate between white- and blue-flowers in Japanese gentian plants　　　　　　　　　　　　　　　
NAKATSUKA Takashi, SAITO Misa, SATO-USHIKU Yuka, YAMADA Eri, NAKASATO Takashi, HOSHI Nobue, FUJIWARA Kazumichi, HIKAGE Takashi, NISHIHARA Masahiro
Euphytica, Apr. 2012, English

B-1-50 Propagation Characteristics for Wireless Communications in High-Speed Train Cars　　　　　　　　　　　　　　　
HIKAGE Takashi, SHIRAFUNE Masami, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi
Proceedings of the IEICE General Conference, 06 Mar. 2012, Japanese

B-4-44 Direction-of-Arrival Dependence Analysis of Local SAR of Human Model Implanted with Medical Metal Plates in Head　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
Proceedings of the IEICE General Conference, 06 Mar. 2012, Japanese

FDTD Analysis of Propagation Characteristics of Wireless Communications in Crowded Train Cars　　　　　　　　　　　　　　　
HIKAGE Takashi, IRIE Yohei, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi
電子情報通信学会技術研究報告. A・P, アンテナ・伝播, 11 Jan. 2012, Japanese
Recently, some railway companies have begun in-car wireless LAN service. The aim of this study is to develop an accurate and reliable method of estimating electromagnetic field (EMF) distributions in train cars so as to advance radio link design of wireless LANs operated inside the cars. This paper uses FDTD technique and a large-scale parallel computing technique to estimate the propagation characteristics of the typical train car model. EMF distributions created by a 5.2 GHz wireless transmitter inside the train car are analyzed and propagation characteristics are determined from the anal...

Numerical estimation of the electric field distributions due to mobile radio in an aircraft cabin based on large scale FDTD analysis　　　　　　　　　　　　　　　
Takashi Hikage, Shinya Hiraiwa, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto
Proceedings of EMC Europe 2011 York - 10th International Symposium on Electromagnetic Compatibility, 14 Dec. 2011
The aim of this study is to develop an accurate and reliable method that can estimate the electromagnetic field distributions in aircraft while contributing to the field of numerical EMI assessment. This paper describes large-scale numerical simulations of the electromagnetic fields excited by 800 MHz cellular radio inside an aircraft. We use a typical aircraft model and employ the parallel FDTD technique to estimate field distributions throughout the cabin. Computational results of the 1-dimensional electric field distribution inside the cabin agree well with measured values. In order to estimate the effect of absorption by the passengers' bodies inside the cabin, cumulative probabilities for field distributions are derived. ? 2011 EMC Europe.

Applicability Evaluation of Flat Torso Phantom with Back Absorbing Plate for Active Implantable Medical Devices' EMI Test Based on FDTD Analysis　　　　　　　　　　　　　　　
IRIE Yohei, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
電気学会研究会資料. EMC, 電磁環境研究会, 09 Dec. 2011, Japanese

Applicability Evaluation of Flat Torso Phantom with Back Absorbing Plate for Active Implantable Medical Devices' EMI Test Based on FDTD Analysis　　　　　　　　　　　　　　　
IRIE Yohei, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
電子情報通信学会技術研究報告. EMCJ, 環境電磁工学, 02 Dec. 2011, Japanese
The purpose of this research is to develop a new human torso phantom that provides more reliable estimations for active implantable medical devices (AIMDs) EMI due to UHF Radio Frequency Identification (RFID) interrogators. We proposed the phantom with an electromagnetic-field absorbing plate attached to the back of the AIMD in order to suppress standing waves, and estimated electromagnetic strength inside the phantom due to plane wave operating at 950 MHz and 2.45 GHz. In this paper, the effect of suppressing the standing waves inside the phantom due to radio waves emitted from a dipole antenna is estimated by using FDTD method.

Numerical estimation of RF propagation characteristics of cellular radio in an aircraft cabin　　　　　　　　　　　　　　　
Masaki Kinoshita, Takashi Hikage, Toshio Nojima, Shunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto
Asia-Pacific Microwave Conference Proceedings, APMC, 01 Dec. 2011
This paper describes large-scale numerical simulations of the electromagnetic fields excited by cellular radio inside an aircraft. We use a typical aircraft model and employ the parallel FDTD technique to estimate field distributions throughout the cabin. In order to validate the analysis results, the calculated electric field distributions are compared to actual field measurements in a Boeing 777-200 aircraft. Computational results of the 1-dimensional electric field distribution inside the cabin agree well with measured values. Furthermore, a simplified histogram estimation method for electric field strength in the cabin was employed to deal with the complicated EMF distributions inside the cabin. ? 2011 Engineers Australia.

Numerical estimation methodology for RFID/Active Implantable Medical Device-EMI based upon FDTD analysis　　　　　　　　　　　　　　　
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima
2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011, 21 Nov. 2011
A numerical estimation methodology for RFID /Active Implantable Medical Device (AIMD) EMI based upon FDTD analysis is presented. This methodology can be applied to low-band RFID. In this paper, an example for RFID interrogator in the frequency band of 13.56 MHz (ISO/IEC 18000-3 MODE 1) is shown. It assumes that RFID interrogators operating in the low or HF frequency bands might cause EMI on the AIMDs through the interference voltage induced by the magnetic flux excited by the RFID interrogator. Calculated interference voltage was compared with the EMI characteristics obtained by in-vitro EMI experiments to validate the analysis result. The estimated EMI characteristics obtained by the experiments and the FDTD analysis agreed well. ? 2011 IEEE.

Flat Torso Phantom with Back Absorbing Plate for EMI Test on Active Implantable Medical Devices　　　　　　　　　　　　　　　
IRIE Yohei, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
IEICE technical report. Electromagnetic compatibility, 05 Sep. 2011, Japanese
The purpose of this research is to develop a new human torso phantom that provides more reliable estimations for active implantable medical devices (AIMDs) EMI due to UHF Radio Frequency Identification (RFID) interrogators. The phantom has an electromagnetic-field absorbing plate attached to the back of the AIMD in order to suppress standing waves inside the phantom. In this paper, induced voltage at connector of an implantable cardiac pacemaker due to radio waves emitted from the RFID interrogators operating at 950 MHz and 2.45 GHz is estimated by using FDTD method. In addition, the induce...

Estimations of Implantable Cardiac Pacemaker EMI due to Magnetic Resonant Coil for Wireless Power Transfer Using FDTD Analysis　　　　　　　　　　　　　　　
KINOSHITA Masaki, HIKAGE Takashi, NOJIMA Toshio
IEICE technical report. Electromagnetic compatibility, 05 Sep. 2011, Japanese
The purpose of our research is to develop a numerical electromagnetic interference (EMI) estimation method for Active Implantable Medical Device due to wireless power transmission antennas. Wireless Power Transmission technology using near-field magnetic coupling have been expected to achieve various applications (e.g. contactless electric vehicle (EV) charger). However, electromagnetic fields from these devices raises concern that they may cause other electronic devices to malfunction. Accordingly, investigations of EMI have been more important. In particular, EMI effects on medical equipm...

B-1-22 Estimation of Propagation Characteristics of Cellular Radio in an Aircrafi Cabin Using FDTD Method　　　　　　　　　　　　　　　
KINOSHITA Masaki, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Shunichi, KOHMURA Akiko, YONEMOTO Naruto
Proceedings of the Society Conference of IEICE, 30 Aug. 2011, Japanese

B-4-14 Standing Wave Suppression inside Flat Torso Phantom for EMI Test on Active implantable medical devices　　　　　　　　　　　　　　　
IRIE Yohei, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
Proceedings of the Society Conference of IEICE, 30 Aug. 2011, Japanese

BI-3-4 Experimental Estimation and Mitigation Technique for Active Implantable Medical Devices EMI from RFID Interrogators　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, KOIKE Ben, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
Proceedings of the Society Conference of IEICE, 30 Aug. 2011, Japanese

Active implantable medical device EMI assessments for electromagnetic emitters operating in various RF bands　　　　　　　　　　　　　　　
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima
2011 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, IMWS-IWPT 2011 - Proceedings, 14 Jul. 2011
This paper describes the electromagnetic interference (EMI) characteristics of active implantable medical devices based on assessments of Radio Frequency Identification interrogators. Typical examples of interrogators operating in various RF bands are tested to estimate the EMI experienced by implantable-cardiac pacemakers and -cardioverter-defibrillators. The EMI occurrence mechanism and some experimental EMI evaluation results for typical devices are shown. Observed characteristics of the EMI are discussed based upon the transmission radio wave specifications. This discussion can give a good perspective on the same EMI issue raised by wireless power transmission systems. ? 2011 IEEE.

B-1-25 Propagation Characteristics in Crowded Train Cars for Wireless Communications　　　　　　　　　　　　　　　
HIKAGE Takashi, OKAMURA Ryohei, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi
Proceedings of the IEICE General Conference, 28 Feb. 2011, Japanese

B-4-18 FDTD Analysis Using Precise Numerical Human Models to Verify the Experimental Whole-Body Averaged SAR Estimation Method　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
Proceedings of the IEICE General Conference, 28 Feb. 2011, Japanese

Numerical estimation of EMI impact on implantable cardiac pacemakers in elevator using EMF distributions inside human body　　　　　　　　　　　　　　　
Takashi Hikage, Toshio Nojima, Ally Y. Simba, Soichi Watanabe
2010 IEEE International Symposium on Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting - Leading the Wave, AP-S/URSI 2010, 22 Nov. 2010
In recent years, mobile phone usage has extended to a wide range of environment such as places surrounded by conductive surfaces, e.g., train carriages, elevators, and airplanes. There have been concerns that cellular radio can interfere with different types of devices and increased usage in multi-reflection environments has led to concern about the possible effect of electromagnetic interference (EMI) on implantable medical devices (IMDs). Many experimental studies have been carried out in order to assess the EMI generated by cellular radio in free-space and experienced by IMDs including implantable cardiac pacemakers and implantable cardioverter defibrillators (ICDs) [1]-[3]. However, few studies have addressed the effect of EMI on IMDs in elevators. Precise and efficient methods of measuring the electric field (E-field) strength in different regions of multi-reflection environments have not been advanced due to the disturbed fields caused by the presence of measurement equipment and/or human bodies. Therefore, this is achieved by carrying out precise numerical simulations using the Finite-Difference-Time-Domain method [4]. We have already carried out numerical simulations on homogeneous human phantom models and some elevator models to investigate the EMI impact to implantable cardiac pacemakers in elevators; we examined the E-field distribution on the horizontal plane inside elevator [5], outside of human body. In this paper, we introduce our method for estimating pacemaker EMI using EMF distributions inside the region of the human body into which pacemakers are implanted. This enables us to carry out quantitative evaluations of the EMI impact to pacemakers by cellular radio transmission. In order to examine the complex situations where human is present in elevators, our analysis considered a realistically-shaped and anatomically-correct human phantom model. All calculations were run on a supercomputer. ? 2010 IEEE.

Estimation on Electric Field Distribution Emitted by Mobile Phone Inside an Elevator Using FDTD Method with Applied Perfect Electric Conductor Boundary Condition　　　　　　　　　　　　　　　
OKAMURA Ryohei, HIKAGE Takashi, NOJIMA Toshio, SIMBA Ally Y, WATANABE Soichi
電気学会研究会資料. EMC, 電磁環境研究会, 03 Sep. 2010, Japanese

Large Scale FDTD Analysis on Propagation Characteristics of Cellular Radio in Aircraft Cabin　　　　　　　　　　　　　　　
HIRAIWA Shinya, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Syunichi, KOHMURA Akiko, YONEMOTO Naruto
電気学会研究会資料. EMC, 電磁環境研究会, 03 Sep. 2010, Japanese

Estimation of Direction-of-Arrival Dependence of Whole-Body Averaged SAR in Japanese Human Models Exposed to Plane-Wave　　　　　　　　　　　　　　　
KOBAYASHI Noriyuki, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
電気学会研究会資料. EMC, 電磁環境研究会, 03 Sep. 2010, Japanese

FDTD Analysis of implantable medical device EMI due to near field generated around HF RFID reader/writers : Magnetic near-field distribution dependence　　　　　　　　　　　　　　　
KIKUYA Atsushi, HIKAGE Takashi, NOJIMA Toshio, KOIKE Ben, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
電気学会研究会資料. EMC, 電磁環境研究会, 03 Sep. 2010, Japanese

B-1-23 Analysis of Polarization Characteristics in an Airplane Using FDTD Method　　　　　　　　　　　　　　　
HIRAIWA Shinya, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Shunichi, KOHMURA Akiko, YONEMOTO Naruto
Proceedings of the Society Conference of IEICE, 31 Aug. 2010, Japanese

Estimation on Electric Field Distribution Emitted by Mobile Phone Inside an Elevator Using FDTD Method with Applied Perfect Electric Conductor Boundary Condition　　　　　　　　　　　　　　　
OKAMURA Ryohei, HIKAGE Takashi, NOJIMA Toshio, Simba Ally Y, WATANABE Soichi
IEICE technical report. Electromagnetic compatibility, 27 Aug. 2010, Japanese
The purpose of this study is to estimate the electric field distributions emitted by mobile phone inside environments surrounded by conductive surfaces, for example, train carriages or elevators, using FDTD method. We previously investigated the electric field distribution inside elevator in analysis that modeled human body and elevator in high accuracy. In this paper, perfect electric conductor boundary (i.e. the infinite mirror reflection) condition is applied to achieve quantitative estimation for attenuation characteristics of RF field excited by mobile radio in an elevator. As a result...

Large Scale FDTD Analysis on Propagation Characteristics of Cellular Radio in Aircraft Cabin　　　　　　　　　　　　　　　
HIRAIWA Shinya, HIKAGE Takashi, NOJIMA Toshio, FUTATSUMORI Syunichi, KOHMURA Akiko, YONEMOTO Naruto
IEICE technical report. Electromagnetic compatibility, 27 Aug. 2010, Japanese
Recently, some airlines have begun allowing in-flight voice calls. On the other hand, some paper reported that electromagnetic interference (EMI) to aircraft systems from active radio transmitters is possible. The aim of this study is to develop accurate and reliable estimation method of electromagnetic field distributions in aircraft that can contribute to numerical EMI assessment technique. In this report, large-scale numerical simulations are carried out to examine the electromagnetic fields excited by the 800 MHz cellular radio inside an aircraft. We used a typical aircraft model and em...

Estimation of Direction-of-Arrival Dependence of Whole-Body Averaged SAR in Japanese Human Models Exposed to Plane-Wave　　　　　　　　　　　　　　　
KOBAYASHI Noriyuki, KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
IEICE technical report. Electromagnetic compatibility, 27 Aug. 2010, Japanese
Whole-body averaged specific absorption rate (WB-SAR) in realistic human models exposed to RF plane-wave has been estimated by numerical calculations. WB-SAR estimations using numerical calculation exhibit some variations due to difference in human shape or program code in several laboratories. On the other hand, there seems to be no experimental studies which have reported highly accurate and reproducible results for realistic shaped human models. We have proposed a novel WB-SAR estimation method based on external-cylindrical fields scanning technique and carried out measurements using rea...

FDTD Analysis of implantable medical device EMI due to near field generated around HF RFID reader/writers : Magnetic near-field distribution dependence　　　　　　　　　　　　　　　
KIKUYA Atsushi, HIKAGE Takashi, NOJIMA Toshio, KOIKE Ben, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
IEICE technical report. Electromagnetic compatibility, 27 Aug. 2010, Japanese
Electromagnetic interference (EMI) from Radio Frequency Identification (RFID) reader/writers on implantable medical devices (IMD) is investigated. The purpose of our research is to study a numerical EMI estimation method. In this paper, a numerical EMI estimation methodology based upon finite-difference time-domain (FDTD) analysis is presented. The RFID/IMD-EMI discussed in this paper is implantable medical device EMI due to HF (13.56 MHz) RFID reader/writers. Some numerical HF RFID reader/writer antenna models and a human torso phantom model including pacemaker and lead wire are presented....

Whole-body averaged SAR Measurement based on electric field distributions on external cylindrical boundary　　　　　　　　　　　　　　　
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima
EuCAP 2010 - The 4th European Conference on Antennas and Propagation, 12 Aug. 2010
The aim of this study is to develop a new whole-body averaged specific absorption rate (SAR) measurement system based on the external-cylindrical field scanning technique. This technique is adopted with the goal of simplifying the dosimetry estimation of human phantoms that have different postures or sizes. An experimental scale model system is constructed. We consider the anatomical European human phantom and planewaves in the 2 GHz mobile phone frequency band. The measured whole-body averaged SAR results yielded by the proposed method are compared with the results of the FDTD analyses.

B-1-5 Inter-car Propagation Characteristics for Wireless communications in Train cars　　　　　　　　　　　　　　　
HIKAGE Takashi, KITAGAWA Atsushi, NOJIMA Toshio, YAMADA Wataru, SUGIYAMA Takatoshi
Proceedings of the IEICE General Conference, 02 Mar. 2010, Japanese

B-4-48 Whole-Body Averaged SAR Estimation for Postured Japanese Numerical Human Models　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio, NAGAOKA Tomoaki, WATANABE Soichi
Proceedings of the IEICE General Conference, 02 Mar. 2010, Japanese

大規模電磁界数値解析を用いた航空機電磁環境推定　　　　　　　　　　　　　　　
二ッ森俊一, 河村暁子, 米本成人, 日景隆, 野島俊雄
電子航法研究所研究発表会講演概要, 2010
2010 - 2010

Effect of passive RF exposure from mobile phones on passengers inside an elevator: Comparison between adult and child passengers　　　　　　　　　　　　　　　
All Y. Simba, Soichi Watanabe, Takashi Hikage, Toshio Nojima
2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL 2009, 01 Dec. 2009
This paper compares the effect of passive rf exposure on the specific absorption rate and absorbed power of an adult and a child passenger without phones inside an elevator when several other passengers are using their mobile phones simultaneously. The absorbed power and SAR were calculated using finite-difference time-domain. The mobile phones were modeled as half-wavelength dipole antenna placed at the distance of 16 mm from the head, with a transmitting power of 0.25 W. Our results show that child passenger without phone absorbs more power passively as compared to adult passenger. For the case when non-user passenger is surrounded by five passengers using mobile phones, power of 118 and 218 mW were absorbed by the adult and child models, respectively, implying that the passive rf exposure depends on the size of the passengers. Furthermore, the maximum values of the whole-body SARs due to passive exposure are obtained in this work are much smaller than the ICNIRP basic restriction. ?2009 IEEE.

A novel method of mitigating EMI on implantable medical devices: Experimental validation for UHF RFID reader/writers　　　　　　　　　　　　　　　
Yoshifumi Kawamura, Shunichi Futatsumori, Takashi Hikage, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima
IEEE International Symposium on Electromagnetic Compatibility, 01 Dec. 2009
A method of mitigating the electromagnetic interference (EMI) due to wireless communication devices on im-plantable medical devices (IMDs) such as implantable cardiac-pacemakers and implantable cardioverter-defibrillators (ICDs) is newly proposed. The key feature of the proposed method is that it does not require any modification of the IMDs. This method is based on the use of a "mitigation signal" which lies in the idle periods of the wireless communication device. By using this mitigation signal, the low frequency noise signal generated in the IMDs' internal circuits by nonlinear detection, can be reduced. This leads to a drastic improvement in the maximum interference distance. The proposed method is experimentally confirmed in this paper as applied to UHF RFID reader/writers. First, the proposed EMI mitigation method is detailed. An implementation of the method for UHF RFID reader/writers is then presented. The in vitro EMI experiment uses 3 types of actual implantable cardiac pacemakers. Finally, the mitigation results are shown. The results show the proposed method can greatly shorten the maximum interference distance by more than 90 % for all pacemakers. For example, the maximum interference distance of one pacemaker is reduced by 68 cm, from 71 cm to 3 cm. ? 2009 IEEE.

A review of mobile phone usage in enclosed areas and RF safety guideline　　　　　　　　　　　　　　　
Ally Y. Simba, Soichi Watanabe, Takashi Hikage, Toshio Nojima
IEEE AFRICON Conference, 01 Dec. 2009
The use of mobile phones in metallic enclosed environments such as elevators, train cars and even airplanes has attract a lot of attention in recent years. In these environments, most of the radio frequency (RF) energy from mobile phones remains inside due to the lack of escape routes, resulting in possibility of the field levels exceeding limits described in the international RF safety guidelines. This has resulted in an anxiety on possible health effects of passengers in these environments. In this review paper, size of the passengers (child vs. adult human model), method of investigation (theory vs. numerical), passenger position, elevator structure etc., are briefly discussed to determine how they affect the RF exposure. We also discuss few experimental investigation related to this problem for the passenger using a mobile phone near a metallic wall. Our objective is to provide an understanding of the SAR characteristics of the mobile phone user in such environment and how these characteristics are affected by the aforementioned factors. ? 2009 IEEE.

Whole-body averaged SAR measurement method using cylindrical scanning of external electromagnetic fields　　　　　　　　　　　　　　　
Takashi Hikage, Yoshifumi Kawamura, Toshio Nojima
2009 International Symposium on Electromagnetic Compatibility - EMC Europe, 17 Nov. 2009
The final goal of this study is to experimentally estimate the whole-body averaged specific absorption rate (SAR) of humans using the radiation-field scanning technique and a silicone rubber phantom. Dosimetry estimations for human exposure including very numerically accurate phantom models have been reported. However, due to the difficulty of measuring the SAR over the whole human body for the purpose of assessing electromagnetic RF exposure, few investigations have used realistically shaped human phantom models. In this paper, a novel whole-body averaged SAR estimation method based on the power consumption obtained by measuring the radiated power from cylindrical surfaces including humans and the exposure equipment is proposed. Validity of the proposed method based on cylindrical fields scanning is investigated using Finite-Difference Time-Domain (FDTD) calculations for the purpose of designing and developing the experimental system. The calculated whole-body averaged SAR yielded by the proposed method is compared with that obtained by standard calculation methods. ? 2009 IEEE.

C-1-18 An International Inter-laboratory Comparison of SAR Calculation with Virtual Family Model　　　　　　　　　　　　　　　
Hikage Takashi, Kitagawa Atsushi, Nojima Toshio
Proceedings of the Society Conference of IEICE, 01 Sep. 2009, Japanese

B-4-3 Development of a Quasi-Microwave Whole-Body SAR Estimation System using the Cylindrical-External Electric-Field Scanning　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
Proceedings of the Society Conference of IEICE, 01 Sep. 2009, Japanese

B-4-15 Whole-Body Averaged SAR Estimation Method using Cylindrical Scanning of External Electromagnetic Fields　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
Proceedings of the IEICE General Conference, 04 Mar. 2009, Japanese

B-1-16 Numerical Analysis of Indoor Propagation of Plane Wave Incident from Side Walls　　　　　　　　　　　　　　　
Hasegawa Tomotsugu, Shoji Tomohito, Omiya Manabu, Hikage Takashi
Proceedings of the IEICE General Conference, 04 Mar. 2009, Japanese

CS-3-6 ACLR and power efficiency improvements of GaN HEMT power amplifiers using a 5-GHz hightemperature superconducting reaction-type transmitting filter　　　　　　　　　　　　　　　
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori
Proceedings of the IEICE General Conference, 04 Mar. 2009, Japanese

Specific absorption rates of anatomically realistic human models exposed to RF electromagnetic fields from mobile phones used in elevators　　　　　　　　　　　　　　　
Ally Y. Simba, Takashi Hikage, Soichi Watanabe, Toshio Nojima
IEEE Transactions on Microwave Theory and Techniques, 01 Jan. 2009
This paper presents a detailed numerical investigation to determine whether or not an increased specific absorption rate (SAR) in an adult using a mobile phone inside an elevator due to the multireflections of electromagnetic fields from the walls exceed the RF-exposure guidelines. A fully realistic heterogeneous human body model and an actual elevator size were employed. The nonuniform mesh finite-difference time-domain technique and a supercomputer were employed to obtain the SAR and other important parameters. The mobile phone was modeled as a λ/2 dipole antenna placed at a distance of 16 mm from the head. For computations, operating frequencies of 900, 1500, and 2000 MHz with transmitting power of 250 mW were used. Computed results show that the peak spatial-average 10-g SAR depends on the position of the passenger and the antenna against the elevator walls. We observed a substantial increase in the whole-body average SAR and peak 10-g SAR values of the passenger in the elevator over their respective free-space values. However, the maximum values obtained do meet the basic restrictions described in the international RF safety guidelines. For example, the maximum values of the whole-body average and peak spatial-average SAR were 4.4% and 78% of the international RF safety guideline, respectively. ? 2009 IEEE.

Effects of losses due to human phantoms on 3-dimensional Electromagnetic Field distribution in elevators　　　　　　　　　　　　　　　
Y. Kawamaura, T. Hikage, T. Nojima, A. Simba, S. Watanabe
Progress in Electromagnetics Research Symposium, 01 Jan. 2009
The purpose of this study is to estimate the Electromagnetic field (EMF) distributions emitted by Cellular radios in environments surrounded by conductive surfaces, e.g., elevators using precise numerical analysis based on the FDTD method. Since portable radios may be used in various environments, accurate and reliable estimations of EMF in practical environments are required. In this paper, we discuss the EMF absorption effects due to lossy materials being present in elevators. Simplified field histograms and cumulative ratios are derived from 3-dimensional EMF distributions throughout the inner space of the elevator. The lossy material consisted of almost the same volume as a human body and can decrease the strength of EMF distributions inside the elevator by about 20 dB.

A Novel Filter Construction Utilizing HTS Reaction-Type Filter to Improve Adjacent Channel Leakage Power Ratio of GaN HEMT Power Amplifiers　　　　　　　　　　　　　　　
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori
IEICE technical report. Microwaves, 05 Dec. 2008, Japanese
We propose a new band selective stop filter construction to decrease the out of band intermodulation distortion (IMD) noise generated in the transmitting power amplifier. Suppression of IMD noise directly improves the adjacent channel leakage power ratio (ACLR). Firstly, the structure of a 5-GHz split open-ring resonator is investigated. Then, a designed 5-GHz HTS-RTF with 4MHz suppression bandwidth and more than 40dB/MHz sharp skirt is fabricated and experimentally investigated. The measured ACLR values are improved by a maximum of 12.8dB and are constant up to the passband signal power of...

An experimental validation of a detailed numerical model for predicting implantable medical devices EMI due to low-band RFID reader/writers　　　　　　　　　　　　　　　
Shunichi Futatsumori, Norihiro Toyama, Takashi Hikage, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima
Proceedings of 2008 Asia Pacific Microwave Conference, APMC 2008, 01 Dec. 2008

Measurement of the maximum SAR in a spherical phantom when operating a mobile phone near a metallic wall　　　　　　　　　　　　　　　
Ally Y. Simba, Soichi Watanabe, Takashi Hikage, Toshio Nojima
2008 1st International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL 2008, 01 Dec. 2008
The aim of this paper is to present an experimental investigation of the specific absorption rate (SAR) in a spherical phantom head when operating a mobile phone close to a metallic wall. The mobile phone is modeled as a half-wavelength dipole antenna. The effect of the wall on the peak 10-g SAR and input characteristics of the antenna for two wall orientations are measured. The antenna is set to transmit maximum output power of 250 mW at 900 MHz. A slowly decaying sinusoidal form of the peak 10-g SAR curves, which has been predicted by numerical simulation from several authors including ourselves, is confirmed experimentally for the first time. Under the valid antenna-wall distances used in this work, maximum peak 10-g SAR increase of 7 % over the free space value was recorded at the distance of 394 mm away from the wall. Simulated results obtained by the FDTD technique are also presented. Good agreement between the measured and simulated results is obtained.

ACLR improvement of a 5-GHz power amplifier using high-temperature superconducting reaction-type transmitting filters　　　　　　　　　　　　　　　
Shunichi Futatsumori, Takashi Hikage, Toshio Nojima, Akihiko Akasegawa, Teru Nakanishi, Kazunori Yamanaka
Proceedings of the 38th European Microwave Conference, EuMC 2008, 01 Dec. 2008
Adjacent channel leakage power ratio (ACLR) improvement method of a 5-GHz power amplifier using high-temperature superconducting reaction-type transmitting filters (HTS-RTF) is proposed. The aim of this paper is to clarify the amount of ACLR improvement which is offered by HTS-RTFs. Firstly, measurement results of ACLR improvement using a prototype filter is introduced. The prototype filter has an about 10 dB improvement up to 40 dBm Wideband CDMA (W-CDMA) four-carrier signal, even though the suppression band is one side and the bandwidth is narrow. Secondly, to achieve wider suppression band, their resonator structures are optimized. The split-open ring resonator is modified to obtain higher unloaded Q-factor and lower current density. In addition, 5-GHz HTSRTFs which have 3.5 MHz suppression bands in both sides of the W-CDMA carrier signal are designed. Finally, the ACLR improvement obtained by the newly designed filter is estimated based on numerical analysis. The ACLR is improved by about 10 dB in the both sides. Furthermore, the results show that amplifiers' back-off can be reduced by 5 dB when the HTS-RTFs applied to power amplifiers. ? 2008 EuMA.

Numerical analysis of electromagnetic field distributions in a typical aircraft　　　　　　　　　　　　　　　
Takashi Hikage, Toshio Nojima, Manabu Omiya, Kazuo Yamamoto
IEEE International Symposium on Electromagnetic Compatibility, 01 Dec. 2008
The purpose of this study is to develop accurate and reliable estimation method of Electromagnetic field distributions in practical environments including passengers. However, comprehensive measurements in an actual environment cost too much and it is difficult to carry them out precisely. In this paper, large-scale numerical simulations are carried out to examine the electromagnetic fields excited by the 2.45 GHz wireless LAN terminal inside an aircraft. We used a typical aircraft model and employed the FDTD technique and a supercomputer to estimate the field distributions inside the whole area of the cabin. A Large-scale parallel computing technique based upon several node partitions of a supercomputer was used because of its memory and speed capabilities. It is able to give us a good perspective within a reasonable computation time. Furthermore, a simplified histogram estimation method for electric field strength in the cabin was employed to deal with the complicated EMF distributions inside the cabin including passengers. ? 2008 IEEE.

Estimations for Implantable Cardiac Pacemakers EMI from cellular radios in narrow space multi reflection environments　　　　　　　　　　　　　　　
Takashi Hikage, Louis Ray Harris, Toshio Nojima, Simba Ally, Soichi Watanabe
2008 Asia-Pacific Symposium on Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility, APEMC 2008, 19 Sep. 2008
The reason for this study being done is to make an accurate estimate of how the Electromagnetic Field (EMF) is distributed in environments which are almost completely surrounded by conductive surfaces. Some examples of these types of environments are train carriages, elevators and airplanes. Upon analysis of the results, it would then be possible to investigate in further detail the likelihood of there being any effects by Electromagnetic Interference (EMI) on Implantable Cardiac Pacemakers in these kinds of environments, commonly referred to as Semi-Echoic environments.

C-2-84 ACLR improvements of a power amplifier using a 5-GHz high-temperature superconducting reaction-type transmitting filter　　　　　　　　　　　　　　　
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori
Proceedings of the Society Conference of IEICE, 02 Sep. 2008, Japanese

B-1-5 Numerical Analysis of Oblique Incident Plane Wave Indoor Propagation　　　　　　　　　　　　　　　
Hasegawa Tomotsugu, Shoji Tomohito, Omiya Manabu, Hikage Takashi
Proceedings of the Society Conference of IEICE, 02 Sep. 2008, Japanese

An Estimation of Cumulative Probability of Indoor Cross Polarization for Terrestrial Digital Broadcasting　　　　　　　　　　　　　　　
HASEGAWA Tomotsugu, IWAMOTO Yoshinori, OMIYA Manabu, HIKAGE Takashi
ITE Technical Report, 31 Jul. 2008, Japanese
The digital terrestrial broadcasting services for mobile receivers had already been started in Japan. The service is effective as communication means at outbreaks of natural disaster. Experimental studies of the reception characteristic in various environments and countermeasures for the deterioration of reception are carried out until now. In this report, we consider the incidence plane wave of digital terrestrial broadcasting due to clarifying its indoor propagation characteristics. A large-scale numerical analysis by using the finite-difference time-domain technique is employed for this ...

An Estimation of Radiation Patterns of a Vehicle Mounted Antenna for Digital Terrestrial Broadcasting Reception　　　　　　　　　　　　　　　
SHOJI Tomohito, MURAMOTO Mitsuru, HIKAGE Takashi, OMIYA Manabu
ITE Technical Report, 31 Jul. 2008, Japanese
To estimate on-vehicle antenna characteristics accurately, the surrounding environment such as the vehicle body form must be considered in measurements and numerical analysis. This report studies the vehicle model simplification related to radiation patterns of an inverted L antenna for receiving the digital terrestrial television mounted on the vehicle. The numerical evaluations are carried out by employing the FDTD technique. We clarify that the structure of roof and pillar must be considered in computing radiation patterns for four types of numerical model.

FDTD analysis of medical device interference due to near field generated around HF RFID reader/writers: experimental validation based on EMI characteristics of actual devices
TOYAMA Norihiro, FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, KOIKE Ben, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
IEICE technical report, 20 Jun. 2008, The Institute of Electronics, Information and Communication Engineers, Japanese
20 Jun. 2008 - 20 Jun. 2008, Electromagnetic interference (EMI) from Radio Frequency Identification (RFID) reader/writers on implantable medical devices is investigated. The purpose of our research is to study a numerical EMI estimation method. First, four high frequency (HF) RFID reader/writer antennas and numerical antenna models are constructed. In addition, obtained data of magnetic field distributions created around the antenna by using the finite-difference time-domain (FDTD) method and experimentally measured data are comparatively discussed. Next, EMI experiments are performed to obtain the maximum interference distance (distance where EMI disappears) with respect to antenna input power. Then, to validate the analysis results, the relation between the maximum interference distance (obtained by EMI experiments with an injected ECG signal) and the estimated induced voltage at the connector of the implantable cardiac pacemaker model are investigated. A numerical model of a human torso phantom and an implantable cardiac pacemaker are analyzed in order to estimate this voltage.

FDTD analysis of medical device interference due to near field generated around HF RFID reader/writers : Experimental validation based on EMI characteristics of actual devices　　　　　　　　　　　　　　　
TOYAMA Norihiro, FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, KOIKE Ben, FUJIMOTO Hiroshi, TOYOSHIMA Takeshi
電子情報通信学会技術研究報告. EMCJ, 環境電磁工学, 13 Jun. 2008, Japanese
Electromagnetic interference (EMI) from Radio Frequency Identification (RFID) reader/writers on implantable medical devices is investigated. The purpose of our research is to study a numerical EMI estimation method. First, four high frequency (HF) RFID reader/writer antennas and numerical antenna models are constructed. In addition, obtained data of magnetic field distributions created around the antenna by using the finite-difference time-domain (FDTD) method and experimentally measured data are comparatively discussed. Next, EMI experiments are performed to obtain the maximum interference...

SAR Evaluation of the Reproductive Organ of Male Rats for 2GHz in vivo Experiments : Dosimetry Evaluation Using FDTD method　　　　　　　　　　　　　　　
KAWAMURA Yoshifumi, HIKAGE Takashi, NOJIMA Toshio
電子情報通信学会技術研究報告. EMCJ, 環境電磁工学, 13 Jun. 2008, Japanese
In this paper, the specific absorption rates (SARs) of the reproductive organ of male rats are calculated by the simulation using the finite difference time domain (FDTD) method. There have been some publications concerning effects on some sperm profiles due to using cell phone. The experiments which is aim to investigate the influence that the electromagnetic radiation from cellular phone give the function of male reproductive organ are conducting by the Association of Radio Industries and Businesses in Japan. The purpose of this study is exposure dosimetry estimations for the experiments....

Spurious Suppression Effect by HTS power bandpass filters for 5GHz band
YAMANAKA Kazunori, KURIHARA Kazuaki, AKASEGAWA Akihiko, FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio
IEICE technical report, 22 Apr. 2008, The Institute of Electronics, Information and Communication Engineers, Japanese
22 Apr. 2008 - 22 Apr. 2008, For high temperature superconducting (HTS) power bandpass filters (BPFs), the developed resonator devices, the technology issues and promising application area are introduced. Furthermore, we report the preliminary results by numerical simulations on studying transmitter output spurious suppression effect using BPFs, i.e., spurious suppression effects were simulated numerically by difference of frequency selectivity of the model filers as a 5GHz-band modulated RF signal was inputted to RF power amplifier with the output-side model filter.

Spurious Suppression Effect by HTS power bandpass filters for 5GHz band　　　　　　　　　　　　　　　
YAMANAKA Kazunori, KURIHARA Kazuaki, AKASEGAWA Akihiko, Futatsumori Shunichi, Hikage Takashi, Nojima Toshio
Technical report of IEICE. SCE, 15 Apr. 2008, Japanese
For high temperature superconducting (HTS) power bandpass filters (BPFs), the developed resonator devices, the technology issues and promising application area are introduced. Furthermore, we report the preliminary results by numerical simulations on studying transmitter output spurious suppression effect using BPFs, i.e., spurious suppression effects were simulated numerically by difference of frequency selectivity of the model filers as a 5GHz-band modulated RF signal was inputted to RF power amplifier with the output-side model filter.

C-2-94 ACLR improvement of a 5-GHz power amplifier using a high-temperature superconducting reactiontype transmitting filter　　　　　　　　　　　　　　　
FUTATSUMORI Shunichi, HIKAGE Takashi, NOJIMA Toshio, AKASEGAWA Akihiko, NAKANISHI Teru, YAMANAKA Kazunori
Proceedings of the IEICE General Conference, 05 Mar. 2008, Japanese

話題の追跡 RFID機器の医療機器に対する影響についての実験評価　　　　　　　　　　　　　　　
日景 隆, 二ツ森 俊一, 野島 俊雄
自動認識, Feb. 2008, Japanese

A novel assessment methodology for the EMI occurrence in implantable medical devices based upon magnetic flux distribution of RFID reader/writers　　　　　　　　　　　　　　　
Shunichi Futatsumori, Takashi Hikage, Toshio Nojima, Ben Koike, Hiroshi Fujimoto, Takeshi Toyoshima
IEEE International Symposium on Electromagnetic Compatibility, 01 Dec. 2007
With respect to the EMI affecting implantable medical devices caused by Radio Frequency Identification Reader/Writers (RFID R/W), experimental investigations are conducted to develop a risk assessment methodology based upon the measurement of the EMF distribution around RFID R/W. First, fundamental EMI occurrence mechanisms of implantable-cardiac pacemakers and -cardioverter-defibrillators (ICD) are described. Secondly, the characteristics of the radio wave emitted by the RFID R/W are described. Next, EMI test experiments and measurements of the field distributions are performed. Then, a novel experimental assessment methodology is proposed. The EMI characteristics derived from magnetic flux distributions are compared with the experimental results to confirm the effectiveness of the proposed methodology. Finally, it is shown that the probability of EMI occurrence can be estimated using the statistical processing of the proposed methodology. ? 2007 IEEE.

HTS reaction-type transmitting filter based upon split open-ring resonators with surface current density reduction technique　　　　　　　　　　　　　　　
Shunichi Futastumori, Takashi Hikage, Toshio Nojima, Akihiko Akasegawa, Teru Nakanishi, Kazunori Yamanaka
Asia-Pacific Microwave Conference Proceedings, APMC, 01 Dec. 2007
An High-Temperature Superconducting reaction-type transmitting filter (HTS-RTF) based upon split open-ring resonators with novel surface current density reduction technique is proposed. Since reaction-type resonators do not resonate with high-power fundamental signals, an HTS-RTF enables both high-power handling capability and steep skirt property compared to existing planar-type HTS transmitting filters. However, fundamental signals in the passband induce a current in their resonators. Firstly, to reduce induced currents in the passband, novel split open-ring resonator (SORR) structures that reduce maximum current densities while offering both high-unloaded Q-factors and low radiations are numerically investigated for 5-GHz band operation. Secondly, to further improve the current density dispersion effect, additional slits are introduced to the resonator surface. Then, to validate the analysis results, fabrications and measurements of the resonators are carried out. Measurements confirm an unloaded Q-factor of 68,000 and third intermodulation-distortion of -82 dBc at 30 dBm input power. Finally, design and fabrication of a 5-GHz three-pole reaction-type filter with bandwidth of 1.5 MHz (FBW = 0.03 %) is conducted. The measurement results confirm the fundamental performance of the filter.

Estimation of electric field distribution in wireless office LANS using the FDTD method　　　　　　　　　　　　　　　
L. Harris, T. Hikage, T. Nojima
IET Seminar Digest, 01 Dec. 2007
The purpose of this study is to examine the Electric Field distribution in wireless office LAN environments. The model used for this study is a common office environment which has objects of varying physical and electrical properties such as desks, chairs and bookshelves, among others.

A novel microwave high-temperature superconducting reaction-type transmitting filter for mobile base stations　　　　　　　　　　　　　　　
Shunichi Futatsumori, Takashi Hikage, Toshio Nojima
MSMW'07 Symposium Proceedings - The 6th International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves and Workshop on Terahertz Technologies, 01 Dec. 2007
A novel split open-ring reaction-type construction technique to achieve high power-handling capability for High-temperature superconducting (HTS) filters is presented. The purpose of this filter is to suppress the adjacent noise generated by transmitting power amplifiers for mobile base stations, First, it is explained that reaction-type filters are suitable for high power transmission. Secondly, novel split open-ring resonators, which reduce the maximum current density while maintaining high Q-factors are proposed. Current density dispersion effects are evaluated under the same coupling coefficient. Finally, a 5 GHz three-pole reaction-type filter using split open-ring resonators is designed. The frequency characteristics of the filter are investigated by using the method of moments. The results predict that the filter realizes both a higher power-handling capability than that of transmission-type filters and a better skirt property than existing HTS filters using dual-mode resonators. ? 2007 IEEE.

Development of lightweight solid phantom composed of silicone rubber and carbon nanotubes　　　　　　　　　　　　　　　
Takashi Hikage, Yuki Sakaguchi, Toshio Nojima, Yuji Koyamashita
IEEE International Symposium on Electromagnetic Compatibility, 01 Dec. 2007
A lightweight human phantom material that has a specific gravity below 1.0 is newly developed and a full sized realistic shaped human phantom model is constructed using this material. Fundamental material composites are carbon nanotubes and silicone rubber. The carbon nanotubes enable this material to simulate various biological tissues with less specific gravity values than those of original ones. In addition, using the silicone rubber allows us to construct phantom models of various shapes. This paper describes the design principle and estimates the relation between complex permittivity and composition ratio of the material experimentally. Finally, a full sized realistic shaped human phantom model is constructed to show the features of the proposed material. ? 2007 IEEE.