2011, Best Cognition Award　　　　　　　　　　　　　　　
As Publication Co-Chairs
Youhei Kawamura

2011, The 1st International Workshop on Soft Computing and Disaster Control, Best Paper Award　　　　　　　　　　　　　　　
Long-Term Operation of Landslide observation System Using ZigBee Module
Youhei Kawamura

20 Mar. 2010, 日本機械学会, 日本機械学会関東支部第16期総会講演会,若手優秀講演賞受賞　　　　　　　　　　　　　　　
川村 洋平, 若手優秀講演賞, Japan

15 Nov. 2009, 超音波シンポジウム実行委員会, USE2009奨励賞受賞　　　　　　　　　　　　　　　
川村 洋平, 奨励賞

16 Sep. 2008, 社）資源・素材学会, 資源・素材学会平成19年秋季大会，若手ポスター賞受賞　　　　　　　　　　　　　　　
川村 洋平, Japan

Oct. 2006, 第15回ソノケミストリー討論会, ソノケミストリー進歩賞受賞　　　　　　　　　　　　　　　
川村 洋平, Japan

2002, 寒地技術シンポジウム 寒地技術賞（産業部門）　　　　　　　　　　　　　　　
川村 洋平, Japan

Improvement of generalization performance of diagnostic system for drill bit abnormality in rotary percussion drilling with grad-CAM
Yuna Nakazawa, Natsuo Okada, Jo Sasaki, Lesego Senjoba, Yoko Ohtomo, Youhei Kawamura
Discover Applied Sciences, 7, 4, Springer Science and Business Media LLC, 12 Apr. 2025
Scientific journal

Data-driven machine learning approaches for simultaneous prediction of peak particle velocity and frequency induced by rock blasting in mining
Yewuhalashet Fissha, Prashanth Ragam, Hajime Ikeda, N. Kushal Kumar, Tsuyoshi Adachi, P. S. Paul, Youhei Kawamura
Rock Mechanics Bulletin, 4, 1, Jan. 2025
Scientific journal

Predicting ground vibration during rock blasting using relevance vector machine improved with dual kernels and metaheuristic algorithms
Yewuhalashet Fissha, Jitendra Khatti, Hajime Ikeda, Kamaldeep Singh Grover, Narihiro Owada, Hisatoshi Toriya, Tsuyoshi Adachi, Youhei Kawamura
Scientific Reports, 14, 1, Dec. 2024
Scientific journal

Advanced UAV photogrammetry for precision 3D modeling in GPS denied inaccessible tunnels
Hajime Ikeda, Baterdene Bibish, Yewuhalashet Fissha, Brian Bino Sinaice, Hisatoshi Toriya, Tsuyoshi Adachi, Youhei Kawamura
Safety in Extreme Environments, 6, 4, 269, 287, Dec. 2024
Scientific journal

Development of underground communication system for data transmission using Wi-Fi direct and power line communication
Hajime Ikeda, Oluwafemi Kolade, Ling Cheng, Frederick Cawood, Youhei Kawamura
Tunnelling and Underground Space Technology, 153, 106047, 106047, Elsevier BV, Nov. 2024
Scientific journal

Integrated spectral image registration protocol for enhanced land pollution assessment and management: bridging satellite and drone data for high-resolution mapping
Natsuo Okada, Hisatoshi Toriya, Angesom Gebretsadik, Takahiko Arima, Yoko Ohtomo, Youhei Kawamura
Journal of Material Cycles and Waste Management, Springer Science and Business Media LLC, 04 Oct. 2024, [Peer-reviewed]
Scientific journal

An AI-Based Approach for Developing a Recommendation System for Underground Mining Methods Pre-Selection
Elsa Pansilvania Andre Manjate, Natsuo Okada, Yoko Ohtomo, Tsuyoshi Adachi, Bernardo Miguel Bene, Takahiko Arima, Youhei Kawamura
Mining, 4, 4, 747, 765, MDPI AG, 02 Oct. 2024, [Peer-reviewed]
Scientific journal, Selecting the most appropriate mining method to recover mineral resources is a critical decision-making task in mining project development. This study introduces an artificial intelligence-based mining methods recommendation system (AI-MMRS) for the pre-selection of underground mining methods. The study integrates and evaluates the capability of two approaches for mining methods selection (MMS): the memory-based collaborative filtering (CF) approach aided by the UBC-MMS system to predict the top-3 relevant mining methods and supervised machine learning (ML) classification algorithms to enhance the effectiveness and novelty of the AI-MMRS, addressing the limitations of the CF approach. The results reveal that the memory-based CF approach achieves an accuracy ranging from 81.8% to 87.9%. Among the classification algorithms, artificial neural network (ANN) and k-nearest neighbors (KNN) classifiers perform the best, with accuracy levels of 66.7% and 63.6%, respectively. These findings demonstrate the effectiveness and viability of both approaches in MMS, acknowledging their limitations and the need for continuous training and optimization. The proposed AI-MMRS for the pre-selection stage supplemented by the direct involvement of mining professionals in later stages of MMS, has the potential to significantly aid in the MMS decision-making, providing data-driven and experience-based recommendations following the ongoing evolution of mining practices.

APiS (AI powered intelligence spectrum analyser): hyperspectral imaging machine learning analyser app for mineral processing
Natsuo Okada, Narihiro Owada, Kaito Takizawa, Brian Bino Sinaice, Okhala Muacanhia, Angesom Gebretsadik, Shunki Tanaka, Kosei Aikawa, Ilhwan Park, Mayumi Ito, Yoko Ohtomo, Youhei Kawamura
International Journal of Mining, Reclamation and Environment, 1, 27, Informa UK Limited, 02 Oct. 2024
Scientific journal

Advanced mineralogical classification and concentration estimation in mining with MATLAB-powered hyper-spectral imaging and machine learning
Natsuo Okada, Brian Bino Sinaice, Jaewon Kim, Hiromasa Nozaki, Kaito Takizawa, Narihiro Owada, Yoko Ohtomo, Youhei Kawamura
International Journal of Mining, Reclamation and Environment, 1, 21, Informa UK Limited, 06 Jun. 2024
Scientific journal

Optimizing multi-spectral ore sorting incorporating wavelength selection utilizing neighborhood component analysis for effective arsenic mineral detection
Natsuo Okada, Hiromasa Nozaki, Shinichiro Nakamura, Elsa Pansilvania Andre Manjate, Angesom Gebretsadik, Yoko Ohtomo, Takahiko Arima, Youhei Kawamura
Scientific Reports, 14, 1, Springer Science and Business Media LLC, 21 May 2024
Scientific journal, Abstract

Arsenic contamination not only complicates mineral processing but also poses environmental and health risks. To address these challenges, this research investigates the feasibility of utilizing Hyperspectral imaging combined with machine learning techniques for the identification of arsenic-containing minerals in copper ore samples, with a focus on practical application in sorting and processing operations. Through experimentation with various copper sulfide ores, Neighborhood Component Analysis (NCA) was employed to select essential wavelength bands from Hyperspectral data, subsequently used as inputs for machine learning algorithms to identify arsenic concentrations. Results demonstrate that by selecting a subset of informative bands using NCA, accurate mineral identification can be achieved with a significantly reduced the size of dataset, enabling efficient processing and analysis. Comparison with other wavelength selection methods highlights the superiority of NCA in optimizing classification accuracy. Specifically, the identification accuracy showed 91.9% or more when utilizing 8 or more bands selected by NCA and was comparable to hyperspectral data analysis with 204 bands. The findings suggest potential for cost-effective implementation of multispectral cameras in mineral processing operations. Future research directions include refining machine learning algorithms, exploring broader applications across diverse ore types, and integrating hyperspectral imaging with emerging sensor technologies for enhanced mineral processing capabilities.

Cone penetration test-based assessment of liquefaction potential using machine and hybrid learning approaches
Jitendra Khatti, Yewuhalashet Fissha, Kamaldeep Singh Grover, Hajime Ikeda, Hisatoshi Toriya, Tsuyoshi Adachi, Youhei Kawamura
Multiscale and Multidisciplinary Modeling, Experiments and Design, Springer Science and Business Media LLC, 26 Apr. 2024
Scientific journal

Enhancing Interpretability in Drill Bit Wear Analysis through Explainable Artificial Intelligence: A Grad-CAM Approach
Lesego Senjoba, Hajime Ikeda, Hisatoshi Toriya, Tsuyoshi Adachi, Youhei Kawamura
Applied Sciences, 14, 9, 3621, 3621, MDPI AG, 25 Apr. 2024
Scientific journal, This study introduces a novel method for analyzing vibration data related to drill bit failure. Our approach combines explainable artificial intelligence (XAI) with convolutional neural networks (CNNs). Conventional signal analysis methods, such as fast Fourier transform (FFT) and wavelet transform (WT), require extensive knowledge of drilling equipment specifications, which limits their adaptability to different conditions. In contrast, our method leverages XAI algorithms applied to CNNs to directly identify fault signatures from vibration signals. The signals are transformed into their frequency components and then employed as inputs to a CNN model, which is trained to detect patterns indicative of drill bit failure. XAI algorithms are then employed to generate attention maps, highlighting regions of interest in the CNN. By scrutinizing these maps, engineers can identify critical frequencies associated with drill bit failure, providing valuable insights for maintenance and optimization. This method offers a transparent and interpretable framework for analyzing vibration data, enabling informed decision-making and proactive maintenance strategies to enhance drilling efficiency and minimize downtime. The integration of XAI with CNNs facilitates a deeper understanding of the root causes of drill bit failure and improves overall drilling performance.

Enhancing rock fragmentation assessment in mine blasting through machine learning algorithms: a practical approach
Angesom Gebretsadik, Rahul Kumar, Yewuhalashet Fissha, Yemane Kide, Natsuo Okada, Hajime Ikeda, Arvind Kumar Mishra, Danial Jahed Armaghani, Yoko Ohtomo, Youhei Kawamura
Discover Applied Sciences, 6, 5, Springer Science and Business Media LLC, 25 Apr. 2024
Scientific journal, Abstract

The optimization of blasting operations greatly benefits from the prediction of rock fragmentation. The main factors that affect fragmentation are rock mass characteristics, blast geometry, and explosive properties. This paper is a step towards the implementation of machine learning and deep learning algorithms for predicting the extent of fragmentation (in percentage) in open pit mining. While various parameters can affect rock fragmentation, this study considers ten among them (i.e., spacing, drill hole diameter, burden, average bench height, powder factor, number of holes, charge per delay, uniaxial compressive strength, specific drilling, and stemming) to train and test the models. However, due to a weak correlation with rock fragmentation, drill diameter, average bench height, compressive strength, stemming, and charge per delay are eliminated to reduce model complexity. A total of 219 data sets having five input features including the number of holes, spacing, burden, specific drilling, and powder factor are used to develop the models. Machine learning models (random forest regression, support vector regression, and XG boost), as well as a deep learning model (neural network regression), are applied to develop a practical way that can optimize the prediction of fragmentation. This study employs performance measures such as R-squared, RMSE, MSE, MAPE, and MAE. The optimization of the model revealed promising results, indicating that the architecture 5-64-32-16-1 exhibits strong performance. Specifically, the model achieved mean squared error (MSE) values of 41.32 and 28.59 on the training and test datasets, respectively. The R² value for both training and test is 0.83. RFR is also performing well compared to SVR and XG boost with MSE values of 12.37 and 9.89 on training and testing data, respectively.in both sets, the R² value is 94%. Based on permutation importance and shapely plot values, it is observed that the powder factor has the highest impact, while the burden has the lowest impact on fragmentation.

Effect of rock properties on wear and cutting performance of multi blade circular saw with iron based multi-layer diamond segments
Sohan Singh Rajpurohit, Yewuhalashet Fissha, Rabindra Kumar Sinha, Mujahid Ali, Hajime Ikeda, Wade Ghribi, Taoufik Najeh, Yaser Gamil, Youhei Kawamura
Scientific Reports, 14, 1, Springer Science and Business Media LLC, 26 Feb. 2024
Scientific journal, Abstract

This study is an attempt for comprehensive, combining experimental data with advanced analytical techniques and machine learning for a thorough understanding of the factors influencing the wear and cutting performance of multi-blade diamond disc cutters on granite blocks. A series of sawing experiments were performed to evaluate the wear and cutting performance of multi blade diamond disc cutters with varying diameters in the processing of large-sized granite blocks. The multi-layer diamond segments comprising the Iron (Fe) based metal matrix were brazed on the sawing blades. The segment’s wear was studied through micrographs and data obtained from the Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-ray (EDS). Granite rock samples of nine varieties were tested in the laboratory to determine the quantitative rock parameters. The contribution of individual rock parameters and their combined effects on wear and cutting performance of multi blade saw were correlated using statistical machine learning methods. Moreover, predictive models were developed to estimate the wear and cutting rate based on the most significant rock properties. The point load strength index, uniaxial compressive strength, and deformability, Cerchar abrasivity index, and Cerchar hardness index were found to be the significant variables affecting the sawing performance.

Enhancing the occupational safety and well-being of mining and construction workers: an application of emotional intelligence training (EIT)
Mukhtar Olalekan Iyanda, Blessing Olamide Taiwo, Yewuhalashet Fissha, Adams Abiodun Akinlabi, Kelebogile Phili, Hajime Ikeda, Youhei Kawamura
Safety in Extreme Environments, Springer Science and Business Media LLC, 08 Jan. 2024, [Last author]
English, Scientific journal, Abstract

The mining and construction sector in Nigeria holds a pivotal position in driving economic development; nonetheless, it encounters notable challenges, such as project failures and safety apprehensions. The impact of leadership and safety considerations encompasses a broad spectrum of outcomes for projects and the welfare of individuals. The primary aim of this study is to investigate the possibility of inducing significant changes by introducing emotional intelligence (EI) training in the mining and construction industries in Ogun State, Nigeria. The present study employed a mixed-methods research design to authenticate the significant enhancements in post-training emotional intelligence (EI) levels seen among personnel at New Creation Constructions Ltd. The study included the consideration of five distinct groups (A-E) that were responsible for managing comparable projects. The optimization of Group E’s improvement was achieved by the implementation of Emotional Intelligence (EI) training, and subsequently compared to the performance of the remaining four groups. The safety procedures within Group E experienced a substantial enhancement, marked by an escalated utilization of protective equipment, heightened consciousness of safety measures, and a reinforced dedication to safeguarding the welfare of colleagues. Group E exhibited outstanding project management efficiency, displaying commendable performance in multiple areas such as budget adherence, adherence to safety procedures, stakeholder satisfaction, effective communication, and proficient procurement management. To optimize the benefits outlined above, we suggest implementing emotional intelligence (EI) training programs, leadership development initiatives, stress management interventions, regular evaluations of well-being, and focused research tailored to the specific needs of the organization.

Development of Wide-Area Mineral Identification System Using Multispectral Camera Mounted on Drone for Beach Placer Deposits
Hiromasa Nozaki, Natsuo Okada, Brian Bino Sinaice, Yoko Otomo, Youhei Kawamura
Proceedings of the Second International Conference on Resources and Technology (RESAT 2023), 214, 232, Atlantis Press International BV, 29 Dec. 2023
In book

Urban Quarry Ground Vibration Forecasting: A Matrix Factorization Approach
Hajime Ikeda, Masato Takeuchi, Elsa Pansilvania, Brian Bino Sinaice, Hisatoshi Toriya, Tsuyoshi Adachi, Youhei Kawamura
Applied Sciences, 13, 23, 12674, 12674, MDPI AG, 25 Nov. 2023, [Last author]
English, Scientific journal, Blasting is routinely carried out in urban quarry sites. Residents or houses around quarry sites are affected by the ground vibrations induced by blasting. Peak Particle Velocity (PPV) is used as a metric to measure ground vibration intensity. Therefore, many prediction models of PPV using experimental methods, statistical methods, and Artificial Neural Networks (ANNs) have been proposed to mitigate this effect. However, prediction models using experimental and statistical methods have a tendency of poor prediction accuracy. In addition, while prediction models using ANNs can produce a highly accurate prediction results, a large amount of measured data is necessarily collected. In an urban quarry site where the number of blastings is limited, it is difficult to collect a lot of measured data. In this study, a new PPV prediction method using Weighted Non-negative Matrix Factorization (WNMF) is proposed. WNMF is a method that approximates a non-negative matrix (including missing data) to the product of two low-dimensional matrices and predicts the missing data. In addition, WNMF is one of the unsupervised learning methods, so it can predict PPV regardless of the amount of data. In this study, PPV was predicted using measured data from 100 sites at the Mikurahana quarry site in Japan. As a result, the proposed method showed higher accuracy when using measured data at 60 sites rather than 100 sites, and the root mean square error for PPV prediction decreased from 0.1759 (100 points) to 0.1378 (60 points).

Digital Twin Technology in Data Center Simulations: Evaluating the Feasibility of a Former Mine Site
Hajime Ikeda, Nur Ellisha Binti Mokhtar, Brian Bino Sinaice, Muhammad Ahsan Mahboob, Hisatoshi Toriya, Tsuyoshi Adachi, Youhei Kawamura
Sustainability, 15, 23, 16176, 16176, MDPI AG, 21 Nov. 2023
Scientific journal, Mining activities often deem mine sites as temporary, leading to their eventual reclamation, rehabilitation, or abandonment. This study innovates by proposing the re-purposing of the disused Osarizawa mine in Akita, Japan, leveraging its consistently low tunnel temperatures to establish a data center, thereby offering a sustainable economic avenue to offset reclamation costs. We assessed the feasibility of this transformation by gathering comprehensive environmental data from the site and conducting meticulous ventilation simulations. These simulations explored various scenarios encompassing diverse ventilation configurations, data server room dimensions, thermal outputs, and the inherent cooling capabilities of the proposed humid rooms. By juxtaposing the simulation outcomes with the criteria set forth in the ASHRAE 2011 Thermal Guidelines, we pinpointed the optimal parameters that satisfy the stringent temperature and relative humidity prerequisites essential for a data center’s operation. This research underscores the potential of reimagining abandoned mine sites as strategic assets, providing economic benefits while adhering to critical data center infrastructure standards.

Soft ground tunnel lithology classification using clustering-guided light gradient boosting machine
Kursat Kilic, Hajime Ikeda, Tsuyoshi Adachi, Youhei Kawamura
Journal of Rock Mechanics and Geotechnical Engineering, 15, 11, 2857, 2867, Elsevier BV, Nov. 2023
Scientific journal

Evaluation and Prediction of Blast-Induced Ground Vibrations: A Gaussian Process Regression (GPR) Approach
Yewuhalashet Fissha, Hajime Ikeda, Hisatoshi Toriya, Narihiro Owada, Tsuyoshi Adachi, Youhei Kawamura
Mining, 3, 4, 659, 682, MDPI AG, 26 Oct. 2023
Scientific journal, Ground vibration is one of the most hazardous outcomes of blasting. It has a negative impact both on the environment and the human population near to the blasting area. To evaluate the magnitude of blasting vibrations, it is important to consider PPV as a fundamental critical base parameter practice in terms of vibration velocity. This study aims to explore the application of different soft computing techniques, including a Gaussian process regression (GPR), decision tree (DT), and support vector regression (SVR), for the prediction of blast-induced ground vibration (PPV) in quarry mining. The three models were evaluated using classical mathematical evaluation metrics (R2, RMSE, MSE, MAE). The result shows that the GPR model achieves an excellent prediction result; with R2 = 0.94, RMSE = 0.0384, MSE = 0.0014, and MAE = 0.0265, it shows high accuracy in predicting PPV. The Shapley additive explanation (SHAP) results emphasize the importance of understanding the interactions between the various factors and their effects on the vibration assessment. The findings can inform the development of more sustainable and environmentally friendly models for predicting blasting vibrations. Using a GPR to simulate and predict blasting-induced ground vibrations is the study’s main contribution. The GPR can capture complicated, non-linear correlations in data, making it ideal for blast-induced ground vibrations, which are dynamic and nonlinear. By using a Gaussian process regression, we can help companies and researchers improve the safety and efficiency in blast-induced ground vibration environments.

Deep Learning-Based Estimation of Muckpile Fragmentation Using Simulated 3D Point Cloud Data
Hajime Ikeda, Taiga Sato, Kohei Yoshino, Hisatoshi Toriya, Hyongdoo Jang, Tsuyoshi Adachi, Itaru Kitahara, Youhei Kawamura
Applied Sciences (Switzerland), 13, 19, Oct. 2023
Scientific journal

Assessment of Charge Initiation Techniques Effect on Blast Fragmentation and Environmental Safety: An Application of WipFrag Software
Blessing Olamide Taiwo, Yewuhalashet Fissha, Thomas Palangio, Andrew Palangio, Hajime Ikeda, Nageswara Rao Cheepurupalli, Naseer Muhammad Khan, Adams Abiodun Akinlabi, Oluwaseun Victor Famobuwa, Joshua Oluwaseyi Faluyi, Youhei Kawamura
Mining, 3, 3, 532, 551, MDPI AG, 14 Sep. 2023
Scientific journal, Blast charge initiation procedures have a significant impact on both mining safety and production rates. In this study, the inventory benefit of an electric initiation system was investigated to assess its influence on both fragmentation and blast-induced damages. The WipFrag software was used to examine the size distribution and productivity of 12 small-scale blasts initiated by both nonelectric and electric detonators. All blast rounds were initiated with plain-type electric and NONEL detonators. The average burden, spacing, stemming length, and charge weight were, respectively, 0.85 m, 1.10 m, 0.66 m, and 1.1 kg. The results showed that the mesh through which 80% of the blast fragments passed for the electric blast was smaller than the mesh through which the material products from the NONEL blast passed. The results also demonstrated that the generated blast-induced ground vibration (PPV) from all blast rounds for electric blast varied from 0.4–1.2 mm/s and 80–105 dB, while that for nonelectric blast ranged from 0.05–0.2 mm/s and 72–95 dB. As a result, the electric blast initiation technique was found to produce good fragmentation, with a higher percentage of optimum fragment sizes on spec than nonelectrically initiated blasts.

フィールド科学体験型VRシアターの構築とその教育現場への適用と評価　　　　　　　　　　　　　　　
田中洋輔, 大塚尚広, 田中優太朗, 川村洋平
情報処理, 64, 8, Aug. 2023, [Invited]
Japanese, Scientific journal

Application of Bayesian Neural Network (BNN) for the Prediction of Blast-Induced Ground Vibration
Yewuhalashet Fissha, Hajime Ikeda, Hisatoshi Toriya, Tsuyoshi Adachi, Youhei Kawamura
Applied Sciences (Switzerland), 13, 5, Mar. 2023
Scientific journal

A system of the granite weathering degree assessment using hyperspectral image and CNN
Jaewon Kim, Youhei Kawamura, Osamu Nishikawa, Brian Bino Sinaice, Natsuo Okada, Shinji Utsuki
INTERNATIONAL JOURNAL OF MINING RECLAMATION AND ENVIRONMENT, 36, 5, 368, 380, May 2022
English, Scientific journal

Use of a DNN-Based Image Translator with Edge Enhancement Technique to Estimate Correspondence between SAR and Optical Images
Hisatoshi Toriya, Ashraf Dewan, Hajime Ikeda, Narihiro Owada, Mahdi Saadat, Fumiaki Inagaki, Youhei Kawamura, Itaru Kitahara
Applied Sciences (Switzerland), 12, 9, 01 May 2022
Scientific journal

Spectral Angle Mapping and AI Methods Applied in Automatic Identification of Placer Deposit Magnetite Using Multispectral Camera Mounted on UAV
Brian Bino Sinaice, Narihiro Owada, Hajime Ikeda, Hisatoshi Toriya, Zibisani Bagai, Elisha Shemang, Tsuyoshi Adachi, Youhei Kawamura
Minerals, 12, 2, Feb. 2022
Scientific journal

Dimensional Reduction of Rock Hyperspectral Signatures and Classiflcation Based on a NCA Method used in developing a UAV Multispectral Imaging System
Brian Bino Sinaice, Narihiro Owada, Hajime Ikeda, Hisatoshi Toriya, Elisha Shemang, Zibisani Biza Bagai, Shinji Utsuki, Tsuyoshi Adachi, Youhei Kawamura
International Journal of the Society of Material Engineering for Resources, 25, 1, 102, 108, 2022
Scientific journal

Deep Learning as an Early Detection System for Rotary Percussion Drilling Malfunctions
Yoshino Kosugi, Hisatoshi Toriya, Mahdi Saadat, Tsuyoshi Adachi, Hajime Ikeda, Youhei Kawamura
International Journal of the Society of Material Engineering for Resources, 25, 2, 205, 211, 2022
Scientific journal

Communication Experiment of Wi-Fi Direct for Underground Mine Environment Visualization System
Hajime Ikeda, Youhei Kawamura, Oluwafemi Kolade, Daniyar Malgazhdar, Mahdi Saadat, Fumiaki Inagaki, Hisatoshi Toriya, Frederick Thomas Cawood
Lecture Notes in Civil Engineering, 228, 65, 76, 2022
International conference proceedings

Model Scaling in Smartphone GNSS-Aided Photogrammetry for Fragmentation Size Distribution Estimation
Zedrick Paul L. Tungol, Hisatoshi Toriya, Narihiro Owada, Itaru Kitahara, Fumiaki Inagaki, Mahdi Saadat, Hyong Doo Jang, Youhei Kawamura
MINERALS, 11, 12, Dec. 2021
English, Scientific journal

Coupling NCA Dimensionality Reduction with Machine Learning in Multispectral Rock Classification Problems
Brian Bino Sinaice, Narihiro Owada, Mahdi Saadat, Hisatoshi Toriya, Fumiaki Inagaki, Zibisani Bagai, Youhei Kawamura
MINERALS, 11, 8, Aug. 2021
English, Scientific journal

Tourist Participation in the Preservation of World Heritage - A Study at in Cambodia -
Fumiya Kimura, Yutaka Ito, Toshiya Matsui, Hidehiko Shishido, Itaru Kitahara, Youhei Kawamura, Atsuyuki Morishima
JOURNAL OF CULTURAL HERITAGE, 50, 163, 170, Jul. 2021
English, Scientific journal

Investigating asperity damage of natural rock joints in polycrystalline rocks under confining pressure using grain-based model
Mahdi Saadat, Abbas Taheri, Youhei Kawamura
COMPUTERS AND GEOTECHNICS, 135, 104144, 104144, Jul. 2021, [Peer-reviewed], [Last author]
English, Scientific journal

Incorporating asperity strength into rock joint constitutive model for approximating asperity damage: An insight from DEM modelling
Mahdi Saadat, Abbas Taheri, Youhei Kawamura
ENGINEERING FRACTURE MECHANICS, 248, 107744, 107744, May 2021, [Peer-reviewed], [Last author]
English, Scientific journal

Classification of Arsenic Bearing Minerals Using Hyperspectral Imaging and Deep Learning for Mineral Processing
OKADA Natsuo, MAEKAWA Yohei, OWADA Narihiro, HAGA Kazutoshi, SHIBAYAMA Atsushi, KAWAMURA Youhei
Journal of MMIJ, 137, 1, 1, 9, The Mining and Materials Processing Institute of Japan, 31 Jan. 2021
Japanese, Currently, there have been issues concerning the depletion and scarcity of mineral resources. This is mostly due to the excavation of high grade minerals having already occurred years and years ago, hence forcing the mining industry to opt for the production and optimization of lower grade minerals. This however brings about a plethora of problems, many of which economic, stemming from the purification of those low grade minerals in various stages required for mineral processing. In order to reduce costs and aid in the optimization of the mining stream, this study, introduces an automatic mineral identification system which combines the predictive abilities of deep learning with the excellent resolution of hyperspectral imaging, for pre-stage of mineral processing. These technologies were used to identify and classify high grade arsenic (As) bearing minerals from their low grade mineral counterparts non-destructively. Most of this ability to perform such tasks comes from the highly versatile machine learning model which employs deep learning as a means to classify minerals for mineral processing. Experimental results supported this statement as the model was able to achieve an over 90% accuracy in the prediction of As-bearing minerals, hence, one could conclude that this system has the potential to be employed in the mining industry as it achieves modern day system requirements such as high accuracy, speed, economic, userfriendly and automatic mineral identification.

Application of entropy method for estimating factor weights in mining-method selection for development of novel mining-method selection system
Elsa Pansilvania Andre Manjate, Mahdi Saadat, Hisatoshi Toriya, Fumiaki Inagaki, Youhei Kawamura
Journal of Sustainable Mining, 20, 4, 296, 308, 2021
Scientific journal

Mutual superimposing of SAR and ground-level shooting images mediated by intermediate multi-altitude images.
Hisatoshi Toriya, Narihiro Owada, Mahdi Saadat, Fumiaki Inagaki, Ashraf Dewan, Youhei Kawamura, Itaru Kitahara
Array, 12, 100102, 100102, 2021
Scientific journal

Hazard mapping of ground subsidence in east area of Sapporo using frequency ratio model and GIS
Taeyoo Na, Youhei Kawamura, Seong-seung Kang, Shinji Utsuki
GEOMATICS NATURAL HAZARDS & RISK, 12, 1, 347, 362, 01 Jan. 2021, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Automated Identification of Mineral Types and Grain Size Using Hyperspectral Imaging and Deep Learning for Mineral Processing
Natsuo Okada, Yohei Maekawa, Narihiro Owada, Kazutoshi Haga, Atsushi Shibayama, Youhei Kawamura
MINERALS, 10, 9, 1, 22, Sep. 2020
English, Scientific journal

Enhancement of bitumen recovery from the oil sand in an alkaline solution using ultrasound irradiation and carbon dioxide
Hirokazu Okawa, Tomonao Saito, Shohei Yasuda, Youhei Kawamura, Takahiro Kato, Katsuyasu Sugawara, Tayfun Babadagli
JAPANESE JOURNAL OF APPLIED PHYSICS, 59, SK, 01 Jul. 2020, [Peer-reviewed]
English, Scientific journal

Accurate Overlapping Method of Ultra-Long Interval Time-Lapse Images for World Heritage Site Investigation
Hidehiko Shishido, Emi Kawasaki, Youhei Kawamura, Toshiya Matsui, Itaru Kitahara
ACM JOURNAL ON COMPUTING AND CULTURAL HERITAGE, 13, 2, 10, 18, Jun. 2020
English, Scientific journal

Development and Validation of Virtual Reality Application in Mining Education
Yutaka ITO, Masato TAKEUCHI, Shuto MIKAMI, Youhei KAWAMURA
Journal of MMIJ, 136, 5, 33, 39, Mining and Materials Processing Institute of Japan, 31 May 2020, [Peer-reviewed], [Last author]
Japanese, Scientific journal

Development of 3D rock fragmentation measurement system using photogrammetry
Hyongdoo Jang, Itaru Kitahara, Youhei Kawamura, Yasunori Endo, Erkan Topal, Ryo Degawa, Samson Mazara
INTERNATIONAL JOURNAL OF MINING RECLAMATION AND ENVIRONMENT, 34, 4, 294, 305, Apr. 2020, [Peer-reviewed]
English, Scientific journal

University Students' Preferences for Labour Conditions at a Mining Site: Evidence from Two Australian Universities
Yutaka Ito, Shuto Mikami, Hyongdoo Jang, Abbas Taheri, Kenta Tanaka, Youhei Kawamura
RESOURCES-BASEL, 9, 3, 01 Mar. 2020
English, Scientific journal

Application of deep learning approaches in igneous rock hyperspectral imaging
Brian Bino Sinaice, Youhei Kawamura, Jaewon Kim, Natsuo Okada, Itaru Kitahara, Hyongdoo Jang
Springer Series in Geomechanics and Geoengineering, 228, 235, 2020
International conference proceedings

Development of an underground in-situ stress monitoring system for mining safety using multi sensor cell and wi-fi direct technology
Hajime Ikeda, Youhei Kawamura, Hyongdoo Jang, Nur Ellisha Binti Mokhtar, Jun Yokokura, Zedrick Paul L. Tungol
Springer Series in Geomechanics and Geoengineering, 236, 244, 2020
International conference proceedings

An automated underground space monitoring and communication system based on wireless sensor networks
Mohammad Ali Moridi, Mostafa Sharifzadeh, Hyongdoo Jang, Youhei Kawamura
Springer Series in Geomechanics and Geoengineering, 255, 261, 2020
International conference proceedings

Illumination of contributing parameters of uneven break in narrow vein mine
Hyongdoo Jang, Sina Taheri, Erkan Topal, Youhei Kawamura
Springer Series in Geomechanics and Geoengineering, 457, 466, 2020
International conference proceedings

Clustering method of 3D point cloud of muck-pile based on connectivity of adjacent surface
Hidehiko Shishido, Zha Wanzhi, Hyongdoo Jang, Youhei Kawamura, Yoshinari Kameda, Itaru Kitahara
2019 IEEE 8th Global Conference on Consumer Electronics, GCCE 2019, 770, 774, IEEE, Oct. 2019
International conference proceedings

An empirical approach of overbreak resistance factor for tunnel blasting
Hyongdoo Jang, Youhei Kawamura, Utsuki Shinji
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 92, Oct. 2019, [Peer-reviewed]
English, Scientific journal

Overlapping of time sequence change images of lichens in Angkor ruins
宍戸, 英彦, 河﨑, 衣美, 川村, 洋平, 松井, 敏也, 北原, 格
月刊考古学ジャーナル, 730, 29, 33, ニューサイエンス社, Sep. 2019
Japanese, Scientific journal

Development of Angkor Bayon Temple Monitoring System for Preventive Preservation Using ICT　　　　　　　　　　　　　　　
池田, 啓, 川村, 洋平, 横倉, 潤, 宍戸, 英彦, 河﨑, 衣美, 伊藤, 豊, 北原 格, 丸太, 寛之, 里, 知樹, 松井, 敏也
The 36th Annual Meeting of the Japan Society for Scientific Studies on Cultural Property Abstracts, 20, 21, The Korean Sociely of Conservation Science for Cultural Heritage, Jun. 2019
Japanese, Symposium

Implementation and Verification of a Wi-Fi Ad Hoc Communication System in an Underground Mine Environment
H. Ikeda, Y. Kawamura, Z. P.L. Tungol, M. A. Moridi, H. Jang
Journal of Mining Science, 55, 3, 505, 514, 01 May 2019
Scientific journal

Development of wireless sensor networks for underground communication and monitoring systems (the cases of underground mine environments)
Mohammad Ali Moridi, Mostafa Sharifzadeh, Youhei Kawamura, Hyong Doo Jang
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 73, 127, 138, Mar. 2018, [Peer-reviewed]
English, Scientific journal

クラウドソーシングと３次元復技術による世界遺産の予防的保存
河崎 衣美, 伊藤 豊, 川村 洋平, 松井 敏也, 北原 格
信学技報, 2, 77, 82, 2018, [Peer-reviewed]
Scientific journal

Performance analysis of ZigBee network topologies for underground space monitoring and communication systems
Mohammad Ali Moridi, Youhei Kawamura, Mostafa Sharifzadeh, Emmanuel Knox Chanda, Markus Wagner, Hirokazu Okawa
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 71, 201, 209, Jan. 2018, [Peer-reviewed]
English, Scientific journal

Time-Lapse Image Generation using Image-Based Modeling by Crowdsourcing
Hidehiko Shishido, Emi Kawasaki, Yutaka Ito, Youhei Kawamura, Toshiya Matsui, Itaru Kitahara
2018 IEEE INTERNATIONAL CONFERENCE ON BIG DATA (BIG DATA), 3541, 3542, 2018, [Peer-reviewed]
English, International conference proceedings

Comparison of Rock Fragmentation Measurement Systems with 3D System using Photogrammetry Technology　　　　　　　　　　　　　　　
Kitahara, Itaru, Kawamura, Youhei, Topal, Erkan, Endo, Yasunori, Degawa, Ryo, Jang, Hyongdoo
The 2017 World Congress on Advances in Structural Engineering and Mechanics, Aug. 2017, [Peer-reviewed]
English, International conference proceedings

Utilization of ultrasonic atomization for dust control in underground mining
Hirokazu Okawa, Kentaro Nishi, Youhei Kawamura, Takahiro Kato, Katsuyasu Sugawara
JAPANESE JOURNAL OF APPLIED PHYSICS, 56, 7, Jul. 2017, [Peer-reviewed]
English, Scientific journal

Proactive Preservation of World Heritage by Crowdsourcing and 3D Reconstruction Technology
Hidehiko Shishido, Yutaka Ito, Youhei Kawamura, Toshiya Matsui, Atsuyuki Morishima, Itaru Kitahara
2017 IEEE INTERNATIONAL CONFERENCE ON BIG DATA (BIG DATA), 2018-January, 4426, 4428, 01 Jul. 2017, [Peer-reviewed]
English, International conference proceedings

粒度分布推定のための発破ずり３次元モデルの生成手法　　　　　　　　　　　　　　　
出川, 諒, 亀田, 能成, 川村, 洋平, Jang, Hyongdoo, 北原, 格
電子情報通信学会 技術研究報告MVE, 116, 496, 197, 202, 電子情報通信学会, Feb. 2017
Japanese, Symposium

クラウドソーシングと３次元復技術による世界遺産の予防的保存
河崎 衣美, 伊藤 豊, 川村 洋平, 松井 敏也, 北原 格
IEICE Technical Report, PRMU2017, 77, 82, 2017, [Peer-reviewed]
Scientific journal

Illumination of parameter contributions on uneven break phenomenon in underground stoping mines
Jang Hyongdoo, Topal Erkan, Kawamura Youhei
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY, 26, 6, 1095, 1100, 01 Nov. 2016, [Peer-reviewed]
English, Scientific journal

Development of a Landslide Observation System Using ZigBee Wireless Communication Technology
Y. Kawamura, H. Jang, K. Ohta, Y. Inagaki
Geotechnical Special Publication, 2016-January, 269 GSP, 542, 550, American Society of Civil Engineers (ASCE), 2016, [Peer-reviewed]
English, International conference proceedings

3D Model Reconstruction of Rocks on a Slope for Simulating a Rock Fall
Itaru Kitahra, Shogo Atsumi, Ryo Degawa, Youhei Kawamura, Hyongdoo Jang, Yuichi Ohta
Geotechnical Special Publication, 2016-, 269, 508, 517, American Society of Civil Engineers (ASCE), 2016, [Peer-reviewed]
English, International conference proceedings

An Automated Sensing System for Steel Bridge Inspection Using GMR Sensor Array and Magnetic Wheels of Climbing Robot
Rui Wang, Youhei Kawamura
JOURNAL OF SENSORS, 2016, 8121678, 15, 2016, [Peer-reviewed]
English, Scientific journal

Development of climbing robot for steel bridge inspection
Rui Wang, Youhei Kawamura
INDUSTRIAL ROBOT-THE INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH AND APPLICATION, 43, 4, 429, 447, 2016, [Peer-reviewed]
English, Scientific journal

Study on the Conservation Materials for Bas Relief of Bayon　　　　　　　　　　　　　　　
跡見,洋祐, 松井,敏也, 川村 洋平
Annual Technical Report on the Survey of Angkor Monument 2014-2015, 161, 162, Japanese Government Team for Safeguarding Angkor, Dec. 2015
Japanese, Symposium

A Multimedia Data Visualization Based on Ad Hoc Communication Networks and Its Application to Disaster Management
Youhei Kawamura, Markus Wagner, Hyongdoo Jang, Hajime Nobuhara, Takeshi Shibuya, Itaru Kitahara, Ashraf M. Dewan, Bert Veenendaal
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION, 4, 4, 2004, 2018, Dec. 2015, [Peer-reviewed]
English, Scientific journal

Development of underground mine monitoring and communication system integrated ZigBee and GIS
Moridi Mohammad Ali, Kawamura Youhei, Sharifzadeh Mostafa, Chanda Emmanuel Knox, Wagner Markus, Jang Hyongdoo, Okawa Hirokazu
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY, 25, 5, 811, 818, 01 Sep. 2015, [Peer-reviewed]
English, Scientific journal

Analysis of Radio Wave Propagation in an Urban Environment and its Application to Initial Disaster Response Support
Youhei Kawamura, Hyongdoo Jang, Markus Wagner, Hajime Nobuhara, Ashraf M. Dewan, Bert Veenendaal, Itaru Kitahara
JOURNAL OF DISASTER RESEARCH, 10, 4, 655, 666, 01 Aug. 2015, [Peer-reviewed]
English, Scientific journal

Investigation on the vibration generated by tourist activities Ⅱ―A case study of the Tomioka Silk Mill East Cocoon Warehouse―　　　　　　　　　　　　　　　
跡見,洋祐, 松井,敏也, 川村,洋平
THe 32rd Annual Meeting of the Japan Society for Scientific Studies on Cultural Property Abstracts, 96, 97, 日本文化財科学会, Jul. 2015
Japanese, Symposium

Removal of arsenious acid from sulfuric acidic solution using ultrasound oxidation and goethite
Hirokazu Okawa, Tomohiro Yoshikawa, Ryota Hosokawa, Shinji Hangui, Youhei Kawamura, Katsuyasu Sugawara
JAPANESE JOURNAL OF APPLIED PHYSICS, 54, 7, 01 Jul. 2015, [Peer-reviewed]
English, Scientific journal

Decision support system of unplanned dilution and ore-loss in underground stoping operations using a neuro-fuzzy system
Hyongdoo Jang, Erkan Topal, Youhei Kawamura
APPLIED SOFT COMPUTING, 32, 1, 12, 01 Jul. 2015, [Peer-reviewed]
English, Scientific journal

Unplanned dilution and ore loss prediction in longhole stoping mines via multiple regression and artificial neural network analyses
H. Jang, E. Topal, Y. Kawamura
JOURNAL OF THE SOUTHERN AFRICAN INSTITUTE OF MINING AND METALLURGY, 115, 5, 449, 456, May 2015, [Peer-reviewed]
English, Scientific journal

Unplanned dilution and ore loss prediction in longhole stoping mines via multiple regression and artificial neural network analyses
H. Jang, E. Topal, Y. Kawamura
Journal of the Southern African Institute of Mining and Metallurgy, 115, 5, 449, 456, 2015, [Peer-reviewed]
English, Scientific journal

Development of technical measures for the preventive diagnosis of stone-built heritage site　　　　　　　　　　　　　　　
跡見,洋祐, 松井,敏也, 川村,洋平
THe 31rd Annual Meeting of the Japan Society for Scientific Studies on Cultural Property Abstracts, 86, 87, 日本文化財化学会, Jul. 2014
Japanese, Symposium

An investigation of underground monitoring and communication system based on radio waves attenuation using ZigBee
Mohammad Ali Moridi, Youhei Kawamura, Mostafa Sharifzadeh, Emmanuel Knox Chanda, Hyongdoo Jang
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 43, 362, 369, Jul. 2014, [Peer-reviewed]
English, Scientific journal

Using GIS to develop a mobile communications network for disaster-damaged areas
Youhei Kawamura, Ashraf M. Dewan, Bert Veenendaal, Masahiro Hayashi, Takeshi Shibuya, Itaru Kitahara, Hajime Nobuhara, Kento Ishii
International Journal of Digital Earth, 7, 4, 279, 293, Apr. 2014, [Peer-reviewed]
English, Scientific journal

Estimation of underground sound source position from direct sounds and refected sounds from ground surface measured by a small number of geophone array
川岸,卓司, 善甫,啓一, 水谷,孝一, 若槻,尚斗, 川村,洋平
Journal of Japan Society of Civil Engineers, Ser.F3 (Civil Engineering Informatics), 69, 2, I_130, I_138, Japan Society of Civil Engineers, Mar. 2014, [Peer-reviewed]
Japanese, Scientific journal, Recently, pipes like a water pipe or a gas tube are buried in wide area. Horizontal Directional Drilling (HDD) method is used as a pipe embedding method because the method requires no open cuts. However, the position of the drill-bit in underground is instability, and it must be estimated by extend sensors. We focused on the estimation method using the sound generated by the drill-bit itself. In this study, an estimation method of the drill-bit position using the reflected sound from ground surface as well as the direct sound from the drill-bit is proposed. Although the conventional method, which only uses the direct sound, requires a lot of geophones, the proposed method only requires an array consisting of some geophones. From some experiments in actual soil, it was verified that the proposed method was effective for estimating the position of the drill-bit. As the results, the proposed method enabled to estimate 3.42 times more accurately than the conventional method.

Development of underground mine communication and monitoring systems by using ZigBee technology
Y. Kawamura, M. A. Moridi, M. Sharifzadeh, H. Jang
ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014, 1411, 1420, 2014
International conference proceedings

Illustrating quality of life (QOL)
Ashraf M. Dewan, Kamrun Nahar, Yohei Kawamura
Dhaka Megacity: Geospatial Perspectives on Urbanisation, Environment and Health, 239, 256, 01 Jan. 2014
In book

A Magnetic Climbing Robot for Steel Bridge Inspection
Rui Wang, Youhei Kawamura
2014 11TH WORLD CONGRESS ON INTELLIGENT CONTROL AND AUTOMATION (WCICA), 2015-March, March, 3303, 3308, 2014, [Peer-reviewed]
English, International conference proceedings

2P6-2 Detection of Ship Screw Deflection Using Small Element Number of Hydrophone Array(Poster Session)　　　　　　　　　　　　　　　
Kawagishi,Takuji, Zempo,Keiichi, Mizutani,Koichi, Wakatsuki,Naoto, Ebihara,Tadashi, Kawamura,Youhei
Proceedings of Symposium on Ultrasonic Electronics, 34, 357, 358, Steering committee of symposium on ultrasonic electronics, Nov. 2013
English, Scientific journal

地面反射を利用した土中の音源位置推定　　　　　　　　　　　　　　　
川岸,卓司, 善甫,啓一, 水谷,孝一, 若槻,尚斗, 川村,洋平
土木学会, 2013年度土木情報学シンポジウム講演集, 38, 12, 39, 40, Sep. 2013
Japanese, International conference proceedings

A6 Application of sonication for separation and flotation of bitumen from oil sand
Okawa Hirokazu, Saito Tomonao, Sugawara Katsuyasu, Kawamura Youhei, Babadagli Tayfun
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 22, 11, 12, The Japan Society of Sonochemistry, 2013
Japanese, 20% of Canada's oil sand is located on the surface of the ground. These oil sands are taken by means of open-pit mining. Oil sands contain about 10% bitumen. Bitumen is used as fuel energy, and it is necessary to separate bitumen from oil sand at high efficiency. Main industrial processes to separate bitumen from oil sand are treatments using hot water and steam in rotating drums. These treatments consist of two processes. The first is the bitumen separation from oil sand and the second is the bitumen flotation from aqueous solution to the solution surface. In this study, the role of high concentrated H_2O_2 to recover bitumen during sonication was investigated. Furthermore, we investigated the optimal combination of ultrasound and gases to improve the separation efficiency and the yield of bitumen from oil sand in the hot water process.

Front edge location estimation for flexion axis using length meter with accelerometer and gyroscope
Satoki Ogiso, Koichi Mizutani, Naoto Wakatsuki, Youhei Kawamura
2013 IEEE 2nd Global Conference on Consumer Electronics, GCCE 2013, 74, 77, IEEE, 2013, [Peer-reviewed]
English, International conference proceedings

Investigation of Thermal Conductivity and Heat Characteristics of Oil Sands Using Ultrasound Irradiation for Shortening the Preheating Time
Shingo Kamagata, Youhei Kawamura, Hirokazu Okawa, Koichi Mizutani
JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 7, 07GE03, Jul. 2012, [Peer-reviewed]
English, Scientific journal

Influence of Air Humidity and Water Particles on Dust Control Using Ultrasonic Atomization
Hirokazu Okawa, Kentaro Nishi, Dai Shindo, Youhei Kawamura
JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 7, 07GE06, Jul. 2012, [Peer-reviewed]
English, Scientific journal

Emergency management withZigBeeand GIS
Youhei Kawamura, Bert Veenendaal, Ashraf M. Dewan, Masahiro Hayashi, Itaru Kitahara, Hajime Nobuhara, Kento Ishii
ISCIIA 2012 - 5th International Symposium on Computational Intelligence and Industrial Applications, 2012
International conference proceedings

Development of digbot for monitoring the underground environment
Masahiro Hayashi, Toshiyuki Miyachi, Youhei Kawamura, Kazutoshi Murakami, Yuichi Kato, Hiroshi Mochiyama
ISCIIA 2012 - 5th International Symposium on Computational Intelligence and Industrial Applications, 2012
International conference proceedings

Efficient construction ofwireless personal area networks for disaster control
Seiji Yasunobu, Hajime Nobuhara, Yohei Kawamura
ISCIIA 2012 - 5th International Symposium on Computational Intelligence and Industrial Applications, 2012
International conference proceedings

2Pa4-13 Influence of Air Humidity on Dust Control Using Ultrasound Atomization(Poster Session)　　　　　　　　　　　　　　　
Okawa,Hirokazu, Nishi,Kentaro, Shindo,Dai, Kawamura,Youhei
Proceedings of Symposium on Ultrasonic Electronics, 0, 32, 133, 134, Steering committee of symposium on ultrasonic electronics, Nov. 2011
Japanese, Scientific journal

A Method for Estimating the Location of the Drill-Bit During Horizontal Directional Drilling Using a Giant-Magnetostrictive Vibrator
Junpei Tamura, Youhei Kawamura, Hidemi Mochiji, Naoto Sasaki, Koichi Mizutani, Hirokazu Okawa
Japanese Journal of Applied Physics, 50, 07HC15-1, 07HC12-6, Jul. 2011, [Peer-reviewed]
English

A Method for Estimating the Location of the Drill-Bit During Horizontal Directional Drilling Using a Giant-Magnetostrictive Vibrator
Junpei Tamura, Youhei Kawamura, Hidemi Mochiji, Naoto Sasaki, Koichi Mizutani, Hirokazu Okawa
JAPANESE JOURNAL OF APPLIED PHYSICS, 50, 7, Jul. 2011, [Peer-reviewed]
English, Scientific journal

Recovery of Bitumen from Oil Sand by Sonication in Aqueous Hydrogen Peroxide
Hirokazu Okawa, Tomonao Saito, Ryota Hosokawa, Takashi Nakamura, Youhei Kawamura, Shinobu Koda
JAPANESE JOURNAL OF APPLIED PHYSICS, 50, 7, Jul. 2011, [Peer-reviewed]
English, Scientific journal

Sonication enables effective iron leaching from green tuff at low temperature
Takashi Nakamura, Hirokazu Okawa, Youhei Kawamura, Katsuyasu Sugawara
Japanese Journal of Applied Physics, 50, 7 PART 2, Jul. 2011, [Peer-reviewed]
English, Scientific journal

Sonication Enables Effective Iron Leaching from Green Tuff at Low Temperature
Takashi Nakamura, Hirokazu Okawa, Youhei Kawamura, Katsuyasu Sugawara
JAPANESE JOURNAL OF APPLIED PHYSICS, 50, 7, 07HE16, 07HE16-4, Jul. 2011, [Peer-reviewed]
English, Scientific journal

Ultrashallow Underground Imaging System For Detecting Buried Object Using Giant-Magnetostriciton Vibrator
KAMOHARA,Akihiro, KAWAMURA,Youhei, KAMAGATA,Shingo, OKAWA,Hirokazu
Journal of MMIJ, 127, 4, 182, 188, The Mining and Materials Processing Institute of Japan, Mar. 2011, [Peer-reviewed]
Japanese, Scientific journal, Recently, Water and gas pipes are developed frequently because of the increased urban population. When the underground piping is constructed, drawings and signs are needed to drill the ground. However, underground pipings and other buried objects are often buried in different locationscompared with drawings. Underground pipings, the rock and the gravel interfere with construction. It is necessary to avoid this situation. To determine the construction of underground pipes, the non-destructive imaging method previously detects the pipe inside the ground. This paper describes a system of ultrashallow underground imaging method using seismic reflection and seismic giant magnetostrictive transducer. We apply a surface wave analysis using a giant magnetostrictive transducer. We improve the accuracy of P wave velocity. For the high-efficiency setup and the underground imaging succeed. This system combines ultrashallow seismic reflection and the ultra-magnetostrictive transducer. It provides the practical system.

Development of high pressure viscosity meter using hall element
Ando Hiroshi, Sasaki Kyuro, Kawamura Youhei, Okawa Hirokazu, Sugai Yuichi
Proceeding of Annual/Fall Meetings of the Japan Petroleum Institute, 2011, 103, 103, The Japan Petroleum Institute, 2011
Japanese, 高圧条件下において粘度を計測する手法は、大掛かりで非常にコストを要するものであった。本研究において、このような高圧条件下においても、簡便に粘度を計測できる手法を開発した。磁石の磁場をホール素子で計測することにより、流体中における磁石の落下運動を非接触で計測し、落体法を用いて流体の粘度を決定した。この計測手法を用いることで、圧力容器など高圧条件である容器内においても、機密性を保った流体の粘度計測をすることができる。

Solid-liquid separation by sonochemistry: A new approach for the separation of mineral suspensions
Takashi Nakamura, Hirokazu Okawa, Youhei Kawamura, Katsuyasu Sugawara
ULTRASONICS SONOCHEMISTRY, 18, 1, 85, 91, Jan. 2011, [Peer-reviewed]
English, Scientific journal

3Pb2-6 Basic Study on Location Estimation of Drill-bit Using Giant-magnetostrictive Vibrator on Simulated Ground(Poster Session)
Tamura Junpei, Kawamura Youhei, Mochiji Hidemi, Sasaki Naoto, Okawa Hirokazu, Mizutani Koichi
Proceedings of Symposium on Ultrasonic Electronics, 32, 32, 477, 478, Institute for Ultrasonic Elecronics, 2011
English

3Pa4-1 A Fundamental Study of Applying Ultrasonic Waves in 20 kHz Band Frequency to the Method of Preheating the Oil Sand(Poster Session)
Kamagata Shingo, Kawamura Youhei, Okawa Hirokazu, Mizutani Kouichi
Proceedings of Symposium on Ultrasonic Electronics, 32, 32, 371, 372, Institute for Ultrasonic Elecronics, 2011
English

2P-42 The use of ultrasound irradiation for extracting bitumen from oil sand at low temperature(Poster Session)　　　　　　　　　　　　　　　
Okawa,Hirokazu, Hosokawa,Ryota, Saito,Tomonao, Nakamura,Takashi, Kawamura,Youhei
Proceedings of Symposium on Ultrasonic Electronics, 0, 31, 373, 374, Steering committee of symposium on ultrasonic electronics, Dec. 2010, [Peer-reviewed]
Japanese, International conference proceedings

2P-35 Improvement in efficiency of iron leaching from green tuff using sonication and oxalic acid(Poster Session)　　　　　　　　　　　　　　　
Nakamura,Takashi, Okawa,Hirokazu, Kawamura,Youhei, Sugawara,Katsuyasu
Proceedings of Symposium on Ultrasonic Electronics, 0, 31, 359, 360, Steering committee of symposium on ultrasonic electronics, Dec. 2010, [Peer-reviewed]
Japanese, International conference proceedings

The sterilization of suspensions contaminated with microorganisms using ultrasound irradiation
T.Nakamura, H.Okawa, R.Hosokawa, T.Saito, Y.Kawamura, and, K.Sugawara, 川村, 洋平
Jpn. J. of Appl. Phys., 49, 07HE11, 応用物理学会, Aug. 2010, [Peer-reviewed]
English, Scientific journal

The Sterilization of Suspensions Contaminated with Microorganisms Using Ultrasound Irradiation
Takashi Nakamura, Hirokazu Okawa, Ryouta Hosokawa, Tomonao Saito, Youhei Kawamura, Katsuyasu Sugawara
JAPANESE JOURNAL OF APPLIED PHYSICS, 49, 7, 0, 0, Jul. 2010, [Peer-reviewed]
English, Scientific journal

Effects of Different Ultrasound Irradiation Frequencies and Water Temperatures on Extraction Rate of Bitumen from Oil Sand
Hirokazu Okawa, Tomonao Saito, Ryota Hosokawa, Takashi Nakamura, Youhei Kawamura, Katsuyasu Sugawara
JAPANESE JOURNAL OF APPLIED PHYSICS, 49, 7, 0, 0, Jul. 2010, [Peer-reviewed]
English, Scientific journal

The Sterilization of Suspensions Contaminated with Microorganisms Using Ultrasound Irradiation
Nakamura,Takashi, Okawa,Hirokazu, Hosokawa,Ryouta, Saito,Tomonao, Kawamura,Youhei, Sugawara,Katsuyasu
Jpn J Appl Phys, 49, 7, 07HE11, 07HE11-4, The Japan Society of Applied Physics, Jul. 2010, [Peer-reviewed]
English, Scientific journal, We investigated the influence of suspended particles on the sterilization efficiency of ultrasound wave applied to microbial suspensions. A microbial solution containing $2.0\times 10^{2}$ cfu/ml of Bacillus bacteria but no suspended particles was sterilized more efficiently by 28 kHz irradiation inducing a strong impact-like physical action compared to 200 kHz irradiation inducing a strong chemical reaction through the generation of radicals and heat. This sterilization effect was enhanced by the suspension of silicon dioxide or green tuff when irradiated at 28 kHz. However, the irradiation of green tuff microbial suspension at 200 kHz resulted in a remarkable decrease in the sterilization efficiency. This reduction was caused by divalent iron in green tuff reacting with radicals generated by 200 kHz irradiation, thus reducing the amount of radicals used for sterilization. Our results suggest that 28 kHz ultrasound irradiation is optimal for the sterilization of microbial suspensions.

Effects of different ultrasound irradiation frequencies and water temperatures on extraction rate of bitumen from oil sand
Hirokazu Okawa, Tomonao Saito, Ryota Hosokawa, Takashi Nakamura, Youhei Kawamura, Katsuyasu Sugawara
Japanese Journal of Applied Physics, 49, 7, 07HE12, 応用物理学会, Jul. 2010, [Peer-reviewed]
English, Scientific journal

20712 Development of Mobile Mechanism Using Magnetic Wheels for Non-Destructive Testing Device of Iron Bridge　　　　　　　　　　　　　　　
HIJIKATA,Daisuke, KAWAMURA,Youhei, UTSUGI,Takahiro
日本機械学会関東支部総会講演会講演論文集, 2010, 16, 231, 232, The Japan Society of Mechanical Engineers, Mar. 2010
Japanese, Scientific journal, We develop a mobile mechanism that can move on the surface of the iron bridge for a non-destructive testing device. This mechanism has four-wheel drive and moves by means of magnetic wheels. It acquires adhesion force efficiently by using the principle of the magnetic circuit. This mechanism achieved vertical plane running. Next, we analyze mechanics when the machine approaches a step. It turns out that getting over steps and climbing a vertical plane become possible by selecting the appropriate parameter. It was confirmed by the experiment.

P13 The ultrasonic irradiation for purifying suspension contaminated with trichloroethylene(Poster session)
Okawa Hirokazu, Nakamura Takashi, Kawamura Youhei, Sugawara Katsuyasu
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 19, 45, 46, The Japan Society of Sonochemistry, 2010
Japanese, In this paper, we demonstrate in a treatment method for suspension contaminated with trichloroethylene (TCE). The objectives of the present work are to study the purifying the suspension contaminated with TCE and the precipitating the fine particles in the suspension using ultrasound irradiation. Suspension and solution were prepared by ion-change water, TCE and green tuff. TCE solution (500ppm) was completely decomposed for 2h sonication in argon atmosphere. And TCE in suspension (500ppm) was also confirmed the completely decomposition at same condition. Compared the decomposition rate of TCE in solution and suspension, the value were almost same. Isoelectric zone of green tuff suspension was 1.4-3.8 in pH. Degradation of TCE generated which was able to be acidified the solution and the suspension to the pH level of the isoelectric zone. TCE purifying and solid-liquid separation of the suspension using ultrasound irradiation was feasible.

1Pa-12 3D Location Estimation of Drill-bit for HDD Method Using Giant-magnetostrictive Vibrator(Poster Session)
KAWAMURA Youhei, TAMURA Junpei, Mochiji Hidemi, Mizutani Koichi, Okawa Hirokazu
Proceedings of Symposium on Ultrasonic Electronics, 31, 31, 39, 40, Institute for Ultrasonic Elecronics, 2010, [Peer-reviewed]
English

Performance evaluation of Contra-Rotating drill for DIGBOT
Ryouhei Abe, Youhei Kawamura, Kazushi Kamijima, Kazutosi Murakami
Proceedings of the SICE Annual Conference, 885, 888, SICE, 2010, [Peer-reviewed]
English, International conference proceedings

Development of the landslide observation system using ZigBee
Yuya Nakahata, Youhei Kawamura
Proceedings of the SICE Annual Conference, 1191, 1194, SICE, 2010, [Peer-reviewed]
English, International conference proceedings

Viscosity Measurement Method using Induced EMF at Coil in PVT Apparatus　　　　　　　　　　　　　　　
H.ANDO, Y.KAWAMURA, H.OKAWA, Y.SUGAI, and, K.SASAKI, 川村, 洋平
International Symposium on Earth Science and Technology 2009, 443-446, Dec. 2009, [Peer-reviewed]
English, International conference proceedings

A Fundamental Study of the Surface-Wave Method: The Use of a Giant-Magnetostriction Vibrator as Seismic Source　　　　　　　　　　　　　　　
A.KAMOHARA, Y.KAWAMURA, Y.NAKAHATA, H.OKAWA, and, K.MIZUTANI, 川村, 洋平
International Symposium on Earth Science and Technology 2009, 437-442, Dec. 2009, [Peer-reviewed]
English, International conference proceedings

2P4-17 The application of sonication for purifying soil contaminated with microorganism(Poster Session)　　　　　　　　　　　　　　　
Nakamura,Takashi, Okawa,Hirokazu, Kawamura,Youhei, Sugawara,Katsuyasu
Symposium on ultrasonic electronics, 0, 30, 317, 318, Steering committee of symposium on ultrasonic electronics, Nov. 2009, [Peer-reviewed]
Japanese, International conference proceedings

1P4-33 Research on the extraction of bitumen from oil sand treated by ultrasound irradiation(Poster Session)　　　　　　　　　　　　　　　
Okawa,Hirokazu, Hosokawa,Ryota, Saito,Tomonao, Nakamura,Takashi, Kawamura,Youhei
Symposium on ultrasonic electronics, 0, 30, 151, 152, Steering committee of symposium on ultrasonic electronics, Nov. 2009, [Peer-reviewed]
Japanese, International conference proceedings

Research on the New Method to Precipitate Hinai Green Tuff Suspension using Ultrasound Irradiation
NAKAMURA,Takashi, OKAWA,Hirokazu, KAWAMURA,Youhei, TAKAHATA,Shigeyuki, NAKA,Hideo, SUGAWARA,Katsuyasu
Resources Processing, 56, 1, 13, 20, The Resources Processing Society of Japan, Apr. 2009, [Peer-reviewed]
Japanese, Scientific journal, Hinai green tuff is quarried in Odate-shi, Akita prefecture in Japan and used for architectural materials. Hinai green tuff suspension is generated from the cutting and the grinding process and it is necessary to treat the solution with precipitants. A chemical flocculant has been used as a precipitation agent for fine particles in the suspension. However, using a chemical flocculant agent produces a wasteful mixture of particles and flocculants, which are impossible to be used as a resource. Therefore, it is necessary to develop a new precipitation method without using precipitants for green tuff particles. In this study, the zeta potential of Hinai green tuff particles in suspension was measured to gain the basic electrochemical properties of the colloidal suspension. We then developed a new precipitation method using sonochemical reaction at 200 kHz, 200 W. From results of the zeta potential measurement using an electrophoresis method, the particles exhibited −50 mV at pH 7.0 and 0 mV at below pH 4.0. Sonochemical reaction was applied to control the pH of the suspension to precipitate the Hinai green tuff particulate. When ultrasonic irradiation was applied to the Hinai green

P21 Ultrasonic irradiation for purifying suspension contaminated with chlorinated organic compound
Nakamura Takashi, Okawa Hirokazu, Kawamura Youhei, Sugawara Katsuyasu
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 18, 69, 70, The Japan Society of Sonochemistry, 2009
Japanese, We present a method to treat suspension contaminated with trichloroethylene (TCE). We aimed to remove TCE and precipitate the fine particles in the suspension using ultrasound irradiation. The solution was prepared from ion-change water and TCE. The suspension was prepared from the solution and green tuff. TCE solution (500ppm) was completely decomposed by 2h sonication in argon atmosphere. And the complete decomposition of TCE in suspension (500ppm) was also confirmed at the same condition. The decomposition rate of TCE in solution and suspension were almost same. Isoelectric zone of green tuff suspension was 1.4-3.8 in pH. The degradation of TCE acidified the solution and brought the pH level of the suspension to the isoelectric zone. Thus, it is feasible to remove TCE and precipitate fine particles in the suspension using ultrasound irradiation.

1P2-34 Validation of Applicability of Surface-wave Method Using Giant-magnetostriction Vibrator as Seismic Source(Poster Session)
Kamohara Akihiro, Kawamura Youhei, Nakahata Yuya, Okawa Hirokazu, Mizutani Koichi
Proceedings of Symposium on Ultrasonic Electronics, 30, 30, 83, 84, Institute for Ultrasonic Elecronics, 2009, [Peer-reviewed]
English

A Method of Underground Imaging Using Value of Elliptic Orbit Brightness for Detecting Underground Piping
KAWAMURA Youhei, KO Takanari, KAMOHARA Akihiro, OKAWA Hirokazu
Journal of MMIJ, 124, 12, 801, 807, 社団法人 資源・素材学会, 25 Dec. 2008, [Peer-reviewed]
Japanese, When underground piping for a water or gas supply is buried, the construction site should be checked in advance, referring to the plan or sign. However, some obstacles, such as unknown pipes or stones, can be encountered. To avoid these cases, an examination of the underground condition is required. The purpose of this study is to detect underground objects that exist in the ultra-shallow layer, where 2-3 m below the surface, and to obtain underground image which is easy to see intuitively. For detection, seismic method is applied. However, this method has two downsides. One is a generally used seismic source not having reproducibility. The other is mixing Rayleigh wave which is one of the surface waves and reflected waves. To compensate these downsides, giant-magnetostriction vibrator was used as a seismic source, and magnified cross-correlation analysis was proposed. Underground image was obtained using combinations of them. In this paper, as the method of underground imaging, new algorithm of elliptic orbit brightness value it was developed by the authors was used.

Accuracy Improvement of Cepstrum Analysis Using Giant-magnetostriction Vibrator Applied to Non-destructive Testing for Crack of Rock Slope　　　　　　　　　　　　　　　
M.Asaka, Y.Kawamura, H.Okawa, K.Mizutani, 川村, 洋平
Proceedings of the 17th Int. Symposium on Mine Planning and Equipment Selection, 744-754, Oct. 2008, [Peer-reviewed]
English, International conference proceedings

Applicability in Cepstrum Analysis Using Giant-Magnetostriction Vibrator Applied to Non-destructive Testing of Concrete Construction and Rock Slope
KAWAMURA Youhei, ASAKA Michinori, KO Takanari, OKAWA Hirokazu, MIZUTANI Koichi
Journal of MMIJ, 124, 6, 452, 458, The Mining and Materials Processing Institute of Japan, 25 Jul. 2008, [Peer-reviewed]
Japanese, Buildings are often damaged by earthquake and land sinkage. Moreover, in Japan, concrete constructions built during the period of high economic growth are getting old. On the other hand, due to weather and geographical features, the collapse of rock slope occurs in many places. So, authors have been conducting a study of the safety assessment of concrete constructions and rock slope using reflection wave method. In this study, the giant-magnetostriction vibrator was used as a transducer to input the ultrasonic wave into a concrete block. Giant-magnetostriction vibrators have much greater input power than piezo-electric ceramics. So, the safety assessment of large scale objects that do not respond with piezo-electric ceramics is possible. These researches are generally called "Non-destructive testing" and herculean task due to the influence of direct wave, because the output wave contains a wave with direct wave and reflection wave together. In this study, as the method to detect the reflection wave, cepstrum analysis was adopted, and arrival times of reflection waves from the bottom of concrete block are shown. The result of cepstrum analysis is greatly influenced by the noise. To improve the result of analysis, the window function which is used in the process of cepustrum analysis was focused, and reduced the influence of direct wave using input voltage waveform. Moreover, the addition of the results of cepstrum analyses in different frequency was applied and the result was greatly improved. The result of this research shows that the cepstrum analysis with giant-magnetostriction vibrator for non-destructive testing is available.

Underground Imaging Method Using Magnified Cross-Correlation Analysis
Euiseong Ha, Youhei Kawamura, Koichi Mizutani, Akihiro Kamohara, Hirokazu Okawa
JAPANESE JOURNAL OF APPLIED PHYSICS, 47, 5, 3946, 3951, 23 May 2008, [Peer-reviewed]
English, Scientific journal

Synthesis of FePO4 cathode material for lithium ion batteries by a sonochemical method
Hirokazu Okawa, Junpei Yabuki, Youhei Kawamura, Ichiro Arise, Mineo Sato
MATERIALS RESEARCH BULLETIN, 43, 5, 1203, 1208, 06 May 2008, [Peer-reviewed]
English, Scientific journal

Underground Imaging Method Using Magnified Cross-Correlation Analysis
Ha, Euiseong, Kawamura, Youhei, Mizutani, Koichi, Kamohara, Akihiro, Okawa, Hirokazu
JAPANESE JOURNAL OF APPLIED PHYSICS, 47, 5:Part 2, 3946, 3951, JAPAN SOCIETY APPLIED PHYSICS, May 2008, [Peer-reviewed]
English, Scientific journal

A13 Research on a new precipitation method of Hinai green tuff suspension by ultrasound irradiation(Oral session)
Nakamura Takashi, Okawa Hirokazu, Kawamura Yohei, Sugawara Katsuyasu
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 17, 36, 37, The Japan Society of Sonochemistry, 2008
Japanese, Hinai green tuff is quarried in Odate-shi, Akita prefecture in Japan and used for architectural materials. Hinai green tuff suspension is generated from the grinding process and it is necessary to treat the solution with precipitants. A chemical flocculant has been used as a precipitation agent for fine particles in the suspension. However, using a chemical flocculant agent produces a wasteful mixture of particles and flocculants, which are impossible to be used as a resource. Therefore, it is necessary to develop a new precipitation method without using precipitants for green tuff particles. In this study, the zeta potential of Hinai green tuff particles in suspension was measured to gain the basic electrochemical properties of the suspension. We then developed a new precipitation method using sonochemical reaction at 200kHz, 200W. From results of the zeta potential measurement using an electrophoresis method, the particles exhibited 0mV at below pH 4.5. Sonochemical reaction was applied to control the pH of the suspension to precipitate the Hinai green tuff particulate. When ultrasonic irradiation was applied to the Hinai green tuff suspension, the pH decreased to 4.5 in 70 min and finally reached 3.4 in 180 min. We successfully extracted pure Hinai green tuff particles as precipitates from the suspension using ultrasound irradiation.

P07 Synthesis of LiFePO_4 Cathode Material for Lithium Ion Battery Treated by Sonochemical Method(Part I,Poster session)
Kudo Yota, Okawa Hirokazu, Kawamura Youhei, Sugawara Katsuyasu, Sato Mineo
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 17, 54, 55, The Japan Society of Sonochemistry, 2008
Japanese, Lithium iron phosphate has attracted attention as a promising cathode material for lithium ion battery, because of its less expensive, abundance. However, the battery capability of this material is at present limited by its low electronic conductivity and low lithium diffusion rate. In order to improve the poor diffusion of lithium ions and the low electronic conductivity, mainly two possible approaches have been studied. One is to increase the surface area of active materials which can reduce the ion-diffusion pathway, and the other is to deposit conductive carbon layers on the surface to improve electronic conductivity. Since the surface area is dependent on the particle size of LiFePO_4, the synthetic method is very important to control the particle size. In this study, Olivine-type LiFePO_4 was prepared via a sonochemical reaction to gain the fine particles. LiOH・H_2O, (NH_4)_2HPO_4 and FeSO_4・7H_2O were used as the starting materials. An Alcohol was added to the solution of the raw materials. When ultrasonic irradiation upon an alcohol, it is so effective for prohibition of conversion from Fe^<2+> to Fe^<3+> in the solution without reducing agent. The precipitate prepared from the solution gave fine particles of LiFePO_4 after calcination. The LiFePO_4 powders obtained was of homogeneity and globular structure with sub-micron particle sizes.

筑波大学 川村研究室 : Geo-Sensing
川村, 洋平
計測と制御 = Journal of the Society of Instrument and Control Engineers, 46, 10, 815, 816, 10 Oct. 2007, [Peer-reviewed]
Japanese

Study on Correspondence between Output Voltage of Cable Sensor for Vibration Detection and Velocity　　　　　　　　　　　　　　　
Y.Kudo, Y.Kawamura, K.Oumura, H.Okawa, and, K.Mizutani, 川村, 洋平
Proceedings of the 16th Int. Symposium on Mine Planning and Equipment Selection, 524-531, Sep. 2007, [Peer-reviewed]
English, International conference proceedings

Detection of underground concrete block using giant-magnetostriction vibrator applying magnified cross-correlation analysis
Eui Seong Ha, Youhei Kawamura, Koichi Mizutani, Hirokazu Okawa, Michinori Asaka
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46, 7B, 4500, 4503, 26 Jul. 2007, [Peer-reviewed]
English, Scientific journal

Detection of underground concrete block using giant-magnetostriction vibrator applying magnified cross-correlation analysis
Eui Seong Ha, Youhei Kawamura, Koichi Mizutani, Hirokazu Okawa, Michinori Asaka
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 46, 7 B, 4500, 4503, 26 Jul. 2007, [Peer-reviewed]
English, Scientific journal

The detection of a misfiring cylinder of diesel engines in excavation machinery using ALM analysis
Y. Kawamura, M. Nagayama, M. Ujihira
International Journal of Mining, Reclamation and Environment, 21, 2, 97, 110, Jun. 2007, [Peer-reviewed]
English, Scientific journal

土石流の巨礫の挙動に関する個別要素法シミュレーション
川村, 洋平, 杉山, 文乃, 倉岡, 千郎
春季大会講演集. I, 資源編, 19, 1, 35, 36, 29 Mar. 2007
Japanese

ジャイロ・加速度センサを用いた落石軌跡計測に関する基礎研究
川村, 洋平, 山近, 哲志, 細川, 雄悟
春季大会講演集. I, 資源編, 19, 1, 33, 34, 29 Mar. 2007
Japanese

超磁歪振動子を用いたコンクリート構造物損傷検査におけるケプストラム解析の適用性
川村, 洋平, 浅香, 充慶, 河, 宜成, 伊藤, 優, 水谷, 孝一
春季大会講演集. I, 資源編, 19, 1, 17, 18, 29 Mar. 2007
Japanese

超磁歪振動子とデコンボリューションフィルタを用いた地中埋設コンクリートブロック検知
川村, 洋平, 河, 宜成, 大川, 浩一, 浅香, 充慶, 水谷, 孝一
春季大会講演集. I, 資源編, 19, 1, 15, 16, 29 Mar. 2007
Japanese

Correspondence between output of cable censer for vibration detection and physical value
工藤, 優樹, 川村, 洋平, 大村, 健, 水谷, 孝一, 名和, 豊春
春季大会講演集. I, 資源編, 19, 1, 13, 14, 29 Mar. 2007
Japanese

超音波による新手法を用いた鉱山ヘルメットライト用電池の開発　　　　　　　　　　　　　　　
中里, 槙吾, 川村, 洋平, 大川, 浩一
春季大会講演集. I, 資源編, 19, 1, 11, 12, Mar. 2007
Japanese, Scientific journal

A1 Synthesis of Iron-based Cathode Materials for Lithium Iron Battery using Sonochemical Method
Okawa Hirokazu, Nakamura Takashi, Nakasato Shingo, Kawamura Yohei, Sato Mineo
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 16, 1, 2, The Japan Society of Sonochemistry, 2007
Japanese, The Olivine-type LiFePO_4 was prepared by sonochemical method starting from LiOH・H_2O, (NH_4)_2HPO_4 and FeSO_4・7H_2O. Ultrasonic irradiation upon the solution of raw materials was able to synthesize fine particles of LiFePO_4 and prohibit the conversion of Fe^<2+> to Fe^<3+> in the solution without using a reducing agent. The prepared LiFePO_4 was characterized by XRD and SEM. The shape of the sample was a globular structure and the particle size of that was homogeneous and under sub-micron. The temperature of the solution is an important factor to synthesis LiFePO_4 by the sonochemical reaction. Discharge behavior of LiFePO_4 synthesized sonochemical reaction at 60℃ of the solution temperature exhibited 113mAhg^<-1> in the range of 4.0-3.0V vs. Li/Li^+ at a current rate of 0.2C. The ultrasonic effects on the precipitation of the LiFePO_4 precursor in the solution are very complicated, but one of them may helps nucleation of the LiFePO_4 precursor as a consequence of the collision among solute raw materials.

3-03P-16 Seismic Prospection of Ultra-shallow Region in S-wave Reflection Method using Maximum Attenuation Point of Surface Wave(Poster session 3)
Kamohara Akihiro, Kawamura Youhei, Ha Eui Seong, Okawa Hirokazu, Mizutani Koichi
Proceedings of Symposium on Ultrasonic Electronics, 28, 28, 389, 390, Institute for Ultrasonic Elecronics, 2007
English

3-03P-15 Proposition of Underground Imaging Method Using Magnified Cross-correlation Analysis(Poster session 3)
Ha Euiseong, Kawamura Youhei, Okawa Hirokazu, Mizutani Koichi
Proceedings of Symposium on Ultrasonic Electronics, 28, 28, 387, 388, Institute for Ultrasonic Elecronics, 2007
English

3-02P-12 Fundamental study for Estimation Crack Distribution in Rock Slope Using Giant-Magnetostriction Vibrator(Poster session 3)
Nakasato Shingo, Kawamura Youhei, Asaka Michinori, Okawa Hirokazu, Mizutani Kouichi
Proceedings of Symposium on Ultrasonic Electronics, 28, 28, 381, 382, Institute for Ultrasonic Elecronics, 2007
English

2-02P-10 Applicability in Cepstrum Analysis Applied to Non-destructive Testing for Crack of Rock Slope Using Giant-magnetostriction Vibrator(Poster session 2)
Asaka Michinori, Kawamura Youhei, Nakasato Shingo, Okawa Hirokazu, Mizutani Koichi
Proceedings of Symposium on Ultrasonic Electronics, 28, 28, 213, 214, Institute for Ultrasonic Elecronics, 2007
English

Proposition of Detecting Underground Object using Ultra Shallow Reflection Method based on P-wave Directivity of Giant-Magnetostriction Vibrator
HA Eui Seong, KAWAMURA Youhei, MIZUTANI Koichi, OKAWA Koichi, ASAKA Michinori
物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference, 115, 0, 261, 264, 30 Oct. 2006
Japanese

落石に作用する衝撃加速度と反発係数の関係
山近, 哲志, 川村, 洋平, 氏平, 増之, 青島, 伸治
春季大会講演集. I, 資源編, 18, 1, 131, 132, 27 Mar. 2006
Japanese

ローテータ方式砕石杭工法を用いた地盤締固め効果の表面波探査による検証
伊藤, 健, 川村, 洋平, 鈴木, 康雄, 山本, 欣右
春季大会講演集. I, 資源編, 18, 1, 125, 126, 27 Mar. 2006
Japanese

複素ケプストラムを用いた転石の根入れ深さおよび損傷探査
伊藤, 優, 川村, 洋平, 鶴島, 守, 水谷, 孝一, 倉岡, 千郎, 青島, 伸治, 氏平, 増之
春季大会講演集. I, 資源編, 18, 1, 123, 124, 27 Mar. 2006
Japanese

多気筒ディーゼルエンジン失火気筒判定における回転数の推定
永山, 誠, 川村, 洋平, 久保, 和良, 氏平, 増之
春季大会講演集. I, 資源編, 18, 1, 45, 46, 27 Mar. 2006
Japanese

A6 Synthesis of Iron-based Cathode Materials for Lithium Ion Battery using Sonochemical Method
Okawa Hirokazu, Nakasato Shingo, Yabuki Junpei, Kawamura Yohei, Arise Ichiro, Uematsu Kazuyoshi, Sato Mineo
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 15, 13, 14, The Japan Society of Sonochemistry, 2006
Japanese, At present, lithium cobalt oxides and lithium nickel oxides are mainly used as cathodes of lithium ion batteries. This is because these materials show very high battery performance. However, they are not suitable for large-scaled batteries such as hybrid vehicles, because they are expensive and poor in resources. We then focused on iron because it is cheaper and more abundant. Iron Phosphate (FeO_4) is one of the most interesting materials in Iron based materials so far because it shows a high discharge voltage of 3.5 volts. The theoretical capacity is 170mAh/g, which is sufficient enough compared to present materials being used as lithium ion batteries. The remarkable feature of FePO_4 is that it can be synthesized in air. Its treatment is very easy but the cycle performance shows poor. In this study, we have tried to obtain good cycle performance and improve discharge capacity of FePO_4 utilizing the sonochemical method. The sonochemical reaction was conducted under the irradiation of ultrasound power 200W and frequency 200kHz for 3hours. The crystalline phase was identified by powder X-ray diffraction. The cathode for the electrochemical characterization was made by mixing powders of the sample, acetylene black and PTFE in 70:25:5 weight ratio under Argon atmosphere. The cathode properties were measured in a galvanic cell with a nonaqueous electrolyte, a polypropylene separator and a Li metal anode. Charge/Discharge performances were evaluated at a current rate of 2C in the voltage range between 2 to 3.9 volts. The first discharge profile obtained for the sample heated at 700℃ is improved about 10% compared with a previous report's one. We could also obtain LiFePO_4 by the sonochemical method.

P18 Synthesis of Fe_3PO_7 Cathode Material for Lithium Iron Battery by Sonochemical Method(Poster Session)
Nakasato Shingo, Okawa Hirokazu, Kawamura Yohei, Uematsu Kazuyosi, Sato Mineo
Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 15, 81, 82, The Japan Society of Sonochemistry, 2006
Japanese, Iron is expected as a positive electrode material because of its large Clarke number. In this reason, we have been interesting in iron based materials and been studying. In this time we focused on Fe_3PO_7. The theoretical capacity as cathode is 777mAh/g. Its large capacity is very attractive to compare to present materials being used as lithium ion batteries (LiCoO_2: 274mAh/g, LiMn_2O_4: 148mAh/g). The literature shows that Fe_3PO_7 was prepared by the two-step solid-state reaction. At first stoichiometric amounts of Fe_2O_3 and (NH_4)_2HPO_4 powders are mixed and heated 950 degrees Celsius for 12hour to synthesize FePO_4. Fe_2O_3 and FePO_4 are mixed and preheated 950 degrees Celsius for 12hour and finally heated at 1050 degrees Celsius and finally Fe_3PO_7 is prepared. Fe_3PO_7 requires a lot of time and high sintered temperature. To improve these problems, we have been studying about an easily synthesis method of Fe_3PO_7. In this study, we used the sonochemical method and try to obtain Fe_3PO_7 by one step reaction.

Verification of an effect of soil densification applying gravel drain system using surface-wave method and DEM simulation
Youhei Kawamura, Ken Ito, Kinsuke Yamamoto, Tatsuo Sakakibara
13th International Congress on Sound and Vibration 2006, ICSV 2006, 6, 4915, 4922, 2006
International conference proceedings

Consideration about effectiveness on magnified cross-correlation analysis in frequency domain by detection of underground piping
Eui Seong Ha, Youhei Kawamura, Koichi Mizutani
13th International Congress on Sound and Vibration 2006, ICSV 2006, 6, 4722, 4729, 2006
International conference proceedings

Cepstrum analysis applied to ultrasonic reflection wave detection wave method to investigate the depth and the damage of the pile
Yu Ito, Youhei Kawamura, Koichi Muzutani, Senro Kuraoka
2006 SICE-ICASE INTERNATIONAL JOINT CONFERENCE, VOLS 1-13, 1561, +, 2006, [Peer-reviewed]
English, International conference proceedings

Study on estimation of the finite-length unknown input waveform from a given input waveform response
Yuki Kudo, Nobuharu Aoshima, Youhei Kawamura
2006 SICE-ICASE INTERNATIONAL JOINT CONFERENCE, VOLS 1-13, 213, +, 2006, [Peer-reviewed]
English, International conference proceedings

Estimation of the engine revolution for statistical analysis of RMS value by using Prony method to detect misfiring cylinder of the diesel engine
Makoto Nagayama, Youhei Kawamura
2006 SICE-ICASE INTERNATIONAL JOINT CONFERENCE, VOLS 1-13, 4016, +, 2006, [Peer-reviewed]
English, International conference proceedings

P2-19 Validation of Effectiveness on Magnified Cross-Correlation Analysis in Frequency Domain based on Directivity of Giant-Magnetostriction Vibrator(Poster session 2)
Ha Eui Seong, Kawamura Youhei, Mizutani Koichi, Okawa Koichi, Asaka Michinori
Proceedings of Symposium on Ultrasonic Electronics, 27, 27, 245, 246, Institute for Ultrasonic Elecronics, 2006
English

P2-18 Detection of Concrete Crack Using Giant-Magnetostriction Vibrator(Poster session 2)
Kawamura Youhei, Asaka Michinori, Ha Eui Seong, Ito Yu, Okawa Koichi, Mizutani Koichi
Proceedings of Symposium on Ultrasonic Electronics, 27, 27, 243, 244, Institute for Ultrasonic Elecronics, 2006
English

Study on the detection of misfiring cylinder in a heavy machinery multi-cylinder diesel engine under the state of rotational fluctuation
Makoto Nagayama, Youhei Kawamura, Masuyuki Ujihira
SAE Technical Papers, 2006, [Peer-reviewed]
English, International conference proceedings

落石シミュレーションにおけるパラメータ同定を目的とした衝撃加速度の検討
西山えるむ, 川村洋平, 山近哲志, 齊藤知宏, 氏平増之
応用力学論文集, 9, 531, 538, 土木学会, 2006, [Peer-reviewed]
Japanese

Study on Output Mechanism of Cable Sensor for Vibration Detection
F.Ito, D.Akhmetov, M.Komazaki, H.Tachikawa, M.Ujihira, K.Ohara;Y, Kawamura, 川村, 洋平
SICE, 41, 9, 715, 723, SICE, Sep. 2005, [Peer-reviewed]
English, Scientific journal, The characteristics and applications of the "cable sensor, " a new type of vibration sensor, are considered in this paper. Previous studies by the authors on the practical use of cable sensors in rockfall detection are reviewed. The mechanism of output voltage generation by the sensor is discussed. Methods for analyzing static electricity and molecular dynamics are applied toward elucidating the sensor's measurement principles. The following results were obtained:
1) Alternating output voltage of cable sensor occurs when an external vibration source causes multiple contacts between the conductor part of the sensor and its dielectric material (FEP). 2) The above fact is demonstrated experimentally through a vibration test using an audio speaker and an acceleration sensor. Output waveforms of the cable sensor are similar to those of the acceleration sensor. 3) From molecular dynamics analysis, it was supposed that FEP with a higher electron affinity might be produced by adding a -CF₂CF₃ group to the main chain of FEP in order to increase the output voltage of the sensor. 4) Output voltage of the sensor decreases with increase in capacitance of the circuit. This means that the output voltage decreases both with an increase in the length of the cable sensor and with the introduction of an extension signal transmission cable. The signal decrement could be compensated by amplification. A transfer function of the measurement circuit is derived, which enables evaluation of the necessary amplification gain. The results of the analysis of material combination for the sensor components and the proposed solutions to the equation describing the measurement circuit have deepened the understanding of the voltage output mechanism and measurement principles of cable sensors.

Ultrasonic measurement system for detecting penetration of boulders by autocorrelation analysis
Y Kawamura, M Tsurushima, K Mizutani, M Ujihira, N Aoshima, S Kuraoka
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 44, 6B, 4364, 4369, Jun. 2005, [Peer-reviewed]
English, Scientific journal

重機用ディーゼルエンジンの失火気筒判定システムにおけるALM解析の改善
川村, 洋平, 永山, 誠, 氏平, 増之, 伊藤, 史人, ダウレン, アクメトフ, 青島, 伸治
春季大会講演集. I, 資源編, 17, 1, 101, 102, 28 Mar. 2005
Japanese

Temperature Measurement in Tunnel Using Acoustic Method
MIZUTANI Koichi, KASHIWAZAKI Kenichi, ITOGA Kazuya, SAWAMURA Kyohei, KUDO Kousuke, KAWAMURA Youhei
春季大会講演集. I, 資源編, 17, 1, 91, 92, 28 Mar. 2005
Japanese

超音波を用いた転石根入れ深さの探査における反射波検出手法
川村, 洋平, 鶴島, 守, 水谷, 孝一, 伊藤, 優, 氏平, 増之, 青島, 伸治
春季大会講演集. I, 資源編, 17, 1, 89, 90, 28 Mar. 2005
Japanese

落石に働く衝撃加速度からみた力学モデルの検討
川村, 洋平, 山近, 哲志, 氏平, 増之, 伊藤, 健, 青島, 伸治
春季大会講演集. I, 資源編, 17, 1, 63, 64, 28 Mar. 2005
Japanese

斜面切削時の崩壊シミュレーション
川村, 洋平, 伊藤, 健, 山近, 哲志, 氏平, 増之, 青島, 伸治, 榊原, 辰雄
春季大会講演集. I, 資源編, 17, 1, 61, 62, 28 Mar. 2005
Japanese

Method of detecting reflection wave using corresponding wave difference analysis for ultrasonic measurement system to detect penetration of boulders
Mamoru Tsurushima, Youhei Kawamura, Yu Ito, Koichi Mizutani, Senro Kuraoka, Masuyuki Ujihira, Nobuharu Aoshima
12th International Congress on Sound and Vibration 2005, ICSV 2005, 5, 4286, 4293, 2005
International conference proceedings

Study on ultrasonic measurement system to detect penetration of boulders
Y. Kawamura, N. Aoshima, M. Tsurushima, Y. Ito, K. Mizutani, M. Ujihira
Proceedings of the SICE Annual Conference, 427, 432, 2005
International conference proceedings

P3-49 Fundamental Study on Ultrasonic Inspection of Steel Pipe in Complex using Lamb Wave
Kawamura Youhei, Noro Kosuke, Ko Takanari, Mizutani Koichi, Aoshima Nobuharu
Proceedings of Symposium on Ultrasonic Electronics, 26, 26, 437, 438, Institute for Ultrasonic Elecronics, 2005
Japanese

P3-46 Accuracy improvement of complex cepstrum analysis for detecting penetration boulders using ultrasonic
Tsurushima Mamoru, Kawamura Youhei, Ito Yu, Mizutani Koichi, Ujihira Masuyuki, Kuraoka Senro, Aoshima Nobuharu
Proceedings of Symposium on Ultrasonic Electronics, 26, 26, 431, 432, Institute for Ultrasonic Elecronics, 2005
Japanese

P3-45 Study on Detecting Underground Piping using Giant-Magnetostriction Vibrator
Kawamura Youhei, Ko Takanari, Noro Kosuke, Mizutani Koichi, Aoshima Nobuharu
Proceedings of Symposium on Ultrasonic Electronics, 26, 26, 429, 430, Institute for Ultrasonic Elecronics, 2005
Japanese

Study of improving the ultrasonic measurement system to detect penetration of boulders using the cepstrum analysis
Youhei Kawamura, Mamoru Tsurushima, Yu Ito, Nobuharu Aoshima, Koichi Mizutani, Senro Kuraoka, Masuyuki Ujihira
12th International Congress on Sound and Vibration 2005, ICSV 2005, 5, 4302, 4309, 2005, [Peer-reviewed]
English, International conference proceedings

Study on the improvement of the credibility of rockfall simulation -direct measurement of acceleration applied to rockfalls
Satoshi Yamachika, Youhei Kawamura, Masuyuki Ujihira, Nobuharu Aoshima
Proceedings of the 14th International Symposium on Mine Planning and Equipment Selection, MPES 2005 and the 5th International Conference on Computer Applications in the Minerals Industries, CAMI 2005, 1403, 1413, 2005, [Peer-reviewed]
English, International conference proceedings

DEM simulation of collapse in cutting of slopes
Youhei Kawamura, Ken Ito, Tatsuo Sakakibara, Masayuki Ujihira, Nobuharu Aoshima
Proceedings of the 14th International Symposium on Mine Planning and Equipment Selection, MPES 2005 and the 5th International Conference on Computer Applications in the Minerals Industries, CAMI 2005, 606, 615, 2005, [Peer-reviewed]
English, International conference proceedings

超音波を用いた杭長探査に関する研究
鶴島守, 川村洋平, 伊藤優, 氏平増之, 水谷孝一, 倉岡千郎, 青島伸治
応用力学論文集, 8, 951, 958, 土木学会, 2005, [Peer-reviewed]
Japanese

落石に働く衝撃加速度計測による落石シミュレーションの改善
山近哲志, 川村洋平, 氏平増之, 伊藤健
応用力学論文集, 8, 531, 538, 土木学会, 2005, [Peer-reviewed]
Japanese

APPLICABILITY OF WAVELET ANALYSIS FOR THE DETECTION OF MISFIRING CYLINDER OF THE DIESEL ENGINE FOR CONSTRUCTION
KAWAMURA Youhei, UJIHIRA Masuyuki, AOSHIMA Nobuharu, ITO Fumito, AKHMETOV Daouren
Doboku Gakkai Ronbunshu, 0, 763, 107, 117, Japan Society of Civil Engineers, 20 Jun. 2004, [Peer-reviewed]
Japanese, Big scale construction machinery is absolutely necessary for the mineral resources development and various construction works. Troubles of the machinery give serious losses in the efficiency of operations and also in financial proceeds. From a practical point of view, we employed a wavelet transform with Gabor function as a window and analyzed the acceleration wave curves data to detect a misfiring cylinder from the multi-cylinders diesel engine. The results by wavelet analysis revealed that the misfiring cylinder could be detected visually in time-frequency maps. With the aid of statistical analysis using rms value, the misfiring cylinder of multi-cylinders diesel engine can, therefore, be doubly checked by wavelet analysis.

Study on the Scale Measurement of Objects Lying on a Slope Using Photographed Image : Method of Scale Correction Considering Slope Angle
UJIHIRA Masuyuki, NAKAJIMA Ippei, KAWAMURA Youhei, KAWAKITA Minoru
Journal of the Japan Society of Engineering Geology, 45, 1, 13, 21, Japan Society of Engineering Geology, 10 Apr. 2004, [Peer-reviewed]
Japanese, It is available to measure the scale of objects applying magnification equation of lens for a photographed image, when the objects are lying in a distant place or too dangerous to access to the places. In practical cases, accurate scale of object can not be measured correctly when only the magnification equation of lens is applied simply to an image, because objects both lying in near place and distant place are photographed in the same frame. Here, method of scale correction was studied initially, because the way of scale correction itself considering slope angle was necessary to calculate the correct lengths of photographed objects. Then, validity of the scale correction method considering slope angle was examined, applying this method to an object model of hexagonal shape on a slope, distributed rocks on a flat board and excavated rocks by blasting. From these examinations, it was confirmed that corrected rate on the scale of hexagonal model was 0.85-1.04 and the rate on the distribution characteristic value of excavated rocks by blasting was 0.94. This correction method is considered to be available for the scale measurement using a photographed image.

ALMによる大型建設機械用ディーゼルエンジンの失火気筒判定システムに関する研究
川村, 洋平, アクメトフ, ダウレン, 氏平, 増之, 石川, 達也, 樋口, 澄志
春季大会講演集. I, 資源編, 16, 1, 75, 76, 29 Mar. 2004
Japanese

Remote Precautionary Diagnosis of Misfiring Cylinder of the Diesel Engine for Heavy Excavation Machinery Using Mobile Multimedia Network
KAWAMURA Youhei, UJIHIRA Masuyuki, AOSHIMA Nobuharu, ITO Fumito, AKHMETOV Daouren F.
Transactions of the Society of Instrument and Control Engineers, 40, 2, 257, 266, The Society of Instrument and Control Engineers, 29 Feb. 2004, [Peer-reviewed]
Japanese, A diesel engine with a misfiring cylinder is likely to break down in a short time when the engine is used without maintenance. The authors have developed a method of detecting the occurrence of cylinder misfiring and specifying the misfiring cylinder by using wavelet analysis and statistical analysis on the r.m.s. values of two kinds of acceleration waveforms. This detection method is considered superior to traditional methods, which require several accelerometers, especially in terms of simplicity. Since the devolopment of the method, research has been conducted on semi-automatic processing of measured signals and signal transmission from the worksite to a remote office. Field tests confirmed that 1×10⁵ points of dynamic data could be transmitted through the mobile multimedia network within 15min, and the time for signal processing was within 15min. Final determination on the condition of a diesel engine in heavy machinery could be achieved within 30min. Shortened processing time is expected by improvement of the processing software.

Study on the detection of misfiring cylinder in a shipping multi cylinder diesel engine using aggregative learning method
Y. Kawamura, M. Ujjhira, M. Nagayama, N. Aoshima, F. Ito, D. Akhmetov
Proceedings of the SICE Annual Conference, 153, 156, 2004, [Peer-reviewed]
English, International conference proceedings

Fundamental Study on Ultrasonic Measurement System to Detect Penetration of Boulders Using Auto-correlation Analysis
Youhei Kawamura, Mamoru Tsurushima, Nobuharu Aoshima, Koichi Mizutani
IECON 2004: 30TH ANNUAL CONFERENCE OF IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOL 2, 2, 1795, 1798, 2004, [Peer-reviewed]
English, International conference proceedings

C-2 Fundamental Study using Ultrasonic Measurement System to Detect Penetration of Boulders
Kawamura Youhei, Tsurushima Mamoru, Mizutani Koichi, Kuraoka Senro, Aoshima Nobuharu
Proceedings of Symposium on Ultrasonic Electronics, 25, 25, 143, 144, Institute for Ultrasonic Elecronics, 2004
Japanese

Study on the Rock Fall Detection System using Steel Wire Cable Sensor and Satellite Phone : Experimental Results on the Applicability for a Cropped Slope
ITO Fumito, UJIHIRA Masuyuki, YASUIKE Masayuki, KAWAMURA Yohei, HIGUCHI Kiyoshi, YAMADA Takashi, AKHMETOV Dauren F., KOMAZAKI Masaaki
Journal of the Japan Society of Engineering Geology, 44, 4, 223, 233, Japan Society of Engineering Geology, 10 Oct. 2003, [Peer-reviewed]
Japanese, Results of geo-engineering monitoring by Monma et al. at Amatori-hashi, West Area, Wakayama, Japan, have shown that the frequency of various scale rock falls tends to increase just before a big rock fall or a slope failure. This phenomenon has been also observed just before 2nd slope failure following the 1st failure in 1997 at No. 2 Shiraito Tunnel, Hokkaido, Japan. The authors propose the frequency monitoring of small rock falls as a useful way to predict large-scale rock falls or slope failures. In this study, practical applicability of rock fall detection system using steel wire cable sensor and satellite phone was carried out. From this field study the following points were made clear: 1) the proposed system is able to transmit the measured rock fall signals to a remote office. The rock fall frequency and the rock fall source could be evaluated, even when the steel wire cable sensor was stretched on the cropped slope having no net, which made easy the propagation of the rock fall impact. 2) It was confirmed that rock fall characteristics, such as the falling velocity, could be evaluated through analysis of the data registered by the field side personal computer. 3) As a result of composition study of measured waveforms, it was concluded that stretching interval of steel wire cable sensors could be increased up to 10m without deterioration of the system rock fall detection abilities.

On Signal Transmission and Data Processing Rate for Remote Diagnosis of Heavy Excavation Machinery
Y. Kawamura, M. Ujihira, K. Higuchi, M. Komazaki, D. F. Akhmetov, F. Ito
Australasian Institute of Mining and Metallurgy Publication Series, 1, 251, 256, 2003, [Peer-reviewed]
English, International conference proceedings

Artificial Neural Network Approach for Evaluation of Weight of Fallen Objects
F. Ito, D. F. Akhmetov, M. Komazaki, M. Yasuike, Y. Kawamura, M. Ujihira
Australasian Institute of Mining and Metallurgy Publication Series, 1, 47, 53, 2003, [Peer-reviewed]
English, International conference proceedings

Applicability of the magnification equation of lens for slope survey
M. Ujihira, T. Hzuka, Y. Kawamura, M. Kawakita
International Journal of Surface Mining, Reclamation and Environment, 16, 3, 230, 244, Sep. 2002, [Peer-reviewed]
English, Scientific journal

Study on the Detection of Misfiring Cylinder in a Multi-Cylinder Diesel Engine Loaded on the Practical Machinery
KAWAMURA Youhei, UJIHIRA Masuyuki, KIRIMOTO Kenta, OGATA Sumitoshi, NAKAMURA Shouichi, HIGUCHI Kiyoshi
Shigen-to-Sozai, 118, 5, 399, 406, The Mining and Materials Processing Institute of Japan, 25 Jun. 2002, [Peer-reviewed]
Japanese, As a motive power in heavy construction machineries including mining and various construction works, a multi-cylinders type of diesel engine is very often used because of its high cost performance. Steady maintaining of diesel engine's operation is substantial in view of economic demands and environmental concerns. To realize this, a practice of early diagnosis and early repair are essential.
In our previous study using a V-12 type of diesel engine installed on a bench, we demonstrated that a misfiring cylinder could be detected by statistical analysis method using rms value of the acceleration waveforms measured on a single point of the engine block.
In this paper, the same experimentation and analyses as in the previous study were conducted for two practical machineries that loaded the same type engine of the previous study. Even though the engine was loaded on a practical machinery, it was found that a misfiring cylinder could be detected by the same way as in the previous study. In addition to the analyzing method in the previous study, in this study, we employed a wavelet transform method with the Gabor function as a window, and analyzed the acceleration waveforms. The results of wavelet analysis revealed that a misfiring cylinder could be detected visually from time-frequency charts. With the aid of statistical analysis using rms value, a misfiring cylinder in a multi-cylinder diesel engine can be doubly checked by wavelet analysis.

Study on the Utilization of Magnification Equation of Lens for the Scale Measurement of an Object in a Long Distance
UJIHIRA Masuyuki, IIZUKA Takehiko, KAWAMURA Youhei, KAWAKITA Minoru
Journal of the Japan Society of Engineering Geology, 43, 1, 2, 13, Japan Society of Engineering Geology, 10 Apr. 2002, [Peer-reviewed]
Japanese, Photograph is often used in geological survey to measure the length or width of a snapped object, placing some scales such as scale itself, a hammer or a cigarette box nearby the object. However, it is difficult to place a scale nearby the object when the object is too far and high from the taking point or too dangerous to get to the object. In this study, practical applicability of magnification equation of lens for indirect calculation of the length of an object was examined. From this study, following points were made clear (1) Upper limit of applicable distance of magnification equation of lens is more than 300m when the lens whose focal length is longer than 100mm is used. (2) Distortion of a snapped image is within 1.0-2.0%, when the lens whose focal length is longer than 100mm is used. (3) Distortion of a snapped image can be revised using the relationship between the displacement from the correct point and radius from the optical axis. (4) Indirect scale measurement method of a long distant object using a camera and a non-prism razor telemeter is useful. However, accurate measurement of the distance, use of a lens of accurate focal length and accurate measurement of the snapped image on a film are absolutely necessary.

Precautionary Diagnosis of Burning Conditions of a Diesel Engine Equipped with Dozen Cylinders for Construction Machinery
KIRIMOTO Kenta, KAWAMURA Youhei, UJIHIRA Masuyuki, OGATA Sumitoshi
計測自動制御学会論文集, 38, 2, 230, 232, 計測自動制御学会, 28 Feb. 2002, [Peer-reviewed]
Japanese

振動解析による建設機械エンジンの不燃気筒の検出　　　　　　　　　　　　　　　
桐本賢太, 川村洋平, 氏平増之, 緒方純俊
電気学会計測部会論文集, 01, 53, 29-34, 2002, [Peer-reviewed]
Japanese, Scientific journal

A Study on Practical Applicability of Steel Wire Cable Sensor for a Real Slope
KOMAZAKI Masaaki, URATA Kenji, ITO Fumito, UJIHIRA Masuyuki, TOKUNAGA Tetsuaki, KONNO Shinya, KAWAMURA Youhei, HIGUCHI Kiyoshi, KAWAKITA Minoru
Journal of the Japan Society of Engineering Geology, 42, 5, 264, 273, Japan Society of Engineering Geology, 10 Dec. 2001, [Peer-reviewed]
Japanese, The authors have been studying a cable sensor based monitoring system for rock fall detection. The tensile strength of cable sensor (CS) is low and not sufficient for usage under real environment conditions. For this reason, steel wire type cable sensor (SWCS) is proposed with the cable sensor coaxially rolled in steel wire. Here, results of a field test, with SWCS installed on a slope, are presented and the following points are made clear.
1). An accelerometer was installed on SWCS, and experiment on sensitivity analysis was performed in which the sensors were excited by blowing their neighborhood. It was shown that there was an exponential dependence between the output voltage of the SWCS and the accelerometer output. The derived equation is possible to transform the output signal of the SWCS into the output signal of the accelerometer, and the sensitivity difference of the sensors could be eliminated. 2). The desired output voltage of SWCS, installed in a grid pattern on a real slope, was gained after amplification with rate of 2. There is a time lag between output voltage waveform of different channels caused by the rock dropped from the upper point of the slope. The analysis of the time lag and the output waveform provides the possibility of the fallen rock behavior monitoring, including jumps, crashes, tracking. The visual pattern of the fallen rock behavior is reconstructed using topographical representation. 3). The analysis of the curve, connecting the initial points of the SWCS output waveforms, provides an information about falling process parameters (velocity coefficient, friction coefficient, the rock fall velocity at the slope foot, kinematical energy). These parameters are valid for design of protective constructions. Also, the SWCS, being used for the long-term monitoring, can be of practical use for large-scale rock fall prediction by measurement of the current frequency of the small rock falls.

A Study on the Detection of Non-combustion Cylinder of the Diesel Engine for Construction Machinery - An application of rms analysis of acceleration waves -
KAWAMURA Youhei, UJIHIRA Masuyuki, HIGUCHI Kiyoshi, NAKAMURA Syouichi, KOMAZAKI Masaaki, ITO Fumito
Shigen-to-Sozai, 117, 6, 485, 493, The Mining and Materials Processing Institute of Japan, 25 Jun. 2001, [Peer-reviewed]
Japanese, Big scale construction machinery is absolutely necessary for the mineral resources development and various construction works. Troubles of the machinery give serious losses in the efficiency of operations and also in financial proceeds. In this meaning, machinery maintenance is very important for mining and construction works. Early diagnosis of the machinery is especially important to prevent a serious damage. Recently, diesel engine applied to excavation machinery are highly improved not to discharge exhaust gases of high concentration and to achieve high energy efficiency. However, a diesel engine involving non combustion cylinder has high probability to breakdown in a short time when the engine is used without any maintenance works.
In this study, autocovariance of acceleration waves of cylinder block was calculated to obtain the period of revolution, and the combustion period of each cylinder was determined. Then rms value corresponding to each combustion period was calculated. Probability of overlapped area of two curves of normal distribution, which were obtained from rms values of normal and non combustion states respectively, was calculated. It was confirmed that non combustion cylinder of a diesel engine of V-12 type could be judged clearly using the relative intensity curve of the probability. This judgement method is considered to be superior to traditional methods where more than several numbers of accelerometers were used, especially from the viewpoint of simplicity.

Comparative Study on the Output Characteristics of Steel Wire Cable Sensor
UJIHIRA Masuyuki, KAWAMURA Youhei, HIGUCHI Kiyoshi, SATOH Masashi, KONNO Hisashi, KOMAZAKI Masaaki, ITO Fumito
Journal of the Japan Society of Engineering Geology, 42, 1, 15, 23, Japan Society of Engineering Geology, 10 Apr. 2001, [Peer-reviewed]
Japanese, It is considered that cable sensor for vibration detection is useful, for instance, to detect the rock falling or small failures of a slope before the occurrence of a big failure. The original cable sensor is susceptible to be yielded by the tensile force, because whose tensile strength is not so enough (40 to 50 kgf). Authors have developed the steel wire cable sensor in which original cable sensor is placed instead of the string of hemp in the central portion. It was necessary to test the sensitivity of this remodeled steel wire cable sensor. As a result of the sensitivity test, following points were clarified: 1) Sensitivity of the steel wire cable sensor does not decrease when the sensor is fixed rigidly or glued continuously to the surfaces of stiff structure made of concrete or steel. 2) Sensitivity of the steel wire cable sensor decreases to 60% against the output of original cable sensor when the cable sensor is buried in the soft land. However, it was confirmed that output level was enough to use practically. In conclusion, the steel wire cable sensor could be used practically to various places to detect vibrations.

Practical applicability of steel wire cable sensor for rock fall detection
M Ujihira, F Ito, T Tokunaga, Y Kawamura, S Konno, K Higuchi, M Komazaki
MINE PLANNING AND EQUIPMENT SELECTION 2001, 57, 62, 2001, [Peer-reviewed]
English, International conference proceedings

Evaluation of the weight of fallen object using the wave forms measured by cable sensor and mobile multimedia network system
F Ito, S Tsukazawa, M Komazaki, M Ujihira, Y Kawamura, T Tokunaga
MINE PLANNING AND EQUIPMENT SELECTION 2001, 755, 760, 2001, [Peer-reviewed]
English, International conference proceedings

A study on the detection of non-combustion cylinder of the diesel engine for construction machinery using wavelet analysis
Y Kawamura, M Ujihira, K Higuchi, K Kirimoto, M Komazaki, F Ito
MINE PLANNING AND EQUIPMENT SELECTION 2001, 167, 172, 2001, [Peer-reviewed]
English, International conference proceedings

時間周波数解析による重機エンジンの診断　　　　　　　　　　　　　　　
桐本賢太, 川村洋平, 氏平増之, 緒方純俊
電気学会計測部会論文集, 00, 42, 13-18, 2001, [Peer-reviewed]
Japanese, Scientific journal

Field Study on the Rock Fall Detection System Using Cable Sensor and ovile Multimedia Network for a Rock Shed of Practical Scale
KOMAZAKI Masaaki, HIRAMA Kazuo, ITO Fumito, UJIHIRA Masuyuki, SUZUKI Shingo, KAWAMURA Youhei, HIGUCHI Kiyoshi
Journal of the Japan Society of Engineering Geology, 41, 4, 200, 209, Japan Society of Engineering Geology, 10 Oct. 2000, [Peer-reviewed]
Japanese, Cable sensor is considered to have a distinctive characteristic to be able to extend a monitoring area for rock failure or rock fall detection. In this study, it was studies if the impact point of fallen rock to rock shed could be evaluated two dimensionally and if the weight of a fallen rock could be evaluated from the measured signals, and characteristics of wave forms of cable sensor was analyzed comparatively with those of accelerometer. Where, cable sensors of 21 strings were stretched in grid pattern of the internal surface of a rock shed of practical scale. Moreover, functions of newly developed signal transmission system using mobile multimedia network was examined. From these field studies, following points have been made clear:
1) Cable sensor can be used insted of accelermeter for rock failure and rock fall detection when high accuracy in not required. 2) Impact point caused by a weight dropping can be evaluated from rise time of wave forms, from amplitudes of wave forms and also from topography drawn using peak values of wave forms. 3) Order of the weight can be estimated from the amplitude of wave forms. 4) Sensitivity decreases when the length of a cable sensor becomes longer than several meter. But it was confirmed that enough sensitivity could be obtained when the length was longer than 100m. 5) It can be said that signal transmission system using mobile multimedia network can be used practically, because data transmission time from the impact initiation to the final displays of transmitted wave forms and topography on a remote computer is within only three minutes.

Practical applicability of steel wire cable sensor for rock fall detection
M Komazaki, K Hirama, F Ito, M Ujihira, Y Kawamura, T Tokunaga
MINE PLANNING AND EQUIPMENT SELECTION 2000, 309, 313, 2000, [Peer-reviewed]
English, International conference proceedings

振動検出用スチールワイヤ型ケーブルセンサの感度特性(共著)
川村, 洋平
土木学会北海道支部論文報告集, 56, 56(A), 204-207, 207, 2000
Japanese, Research society

スチールワイヤ型ケーブルセンサの斜面への適用に関する研究(共著)　　　　　　　　　　　　　　　
川村, 洋平
土木学会北海道支部論文報告集, 56(A), 208-213, 2000
Japanese, Research society

Fundamental Study on the Diagnosis of Diesel Engine of Construction Machinery.　　　　　　　　　　　　　　　
川村, 洋平
土木学会北海道支部論文報告集, 56(A), 296-299, 2000
Japanese, Research society

A field test of a rock fall detection system using cable sensor and mobile multimedia network
M. Komazaki, K. Hirama, M. Ujihira, S. Suzuki, H. Saeki, Y. Kawamura
International Journal of Surface Mining, Reclamation and Environment, 13, 4, 159, 163, 1999
Scientific journal

Applicability of the equation of image magnification of lens for rock engineering
M.Ujihira, T.Iizuka, Y.Kawamura, M.Kawakita, T.Tanabe, 川村, 洋平
Proceeding of '99 Japan-Korea Joint Symposium on Rock Engneering, 171-176, 176, 1999, [Peer-reviewed]
English, International conference proceedings

Study on output characteristics and mechanical strength of the cable sensor for vibration detection　　　　　　　　　　　　　　　
M.Ujihira, Y.Kawamura, M.Sato, H.Konno, M.Komazaki, K.Hirama, 川村, 洋平
Proceedings of the 8^th Int. Symposium on Mine Planning and Equipment Selection, 539-544, 1999, [Peer-reviewed]
English, International conference proceedings

連続衝撃測定センターの特性試験とその考察(共著)　　　　　　　　　　　　　　　
川村, 洋平
土木学会北海道支部論文報告集, 55(A), 52-57, 1999
Japanese, Research society

Rock fall detection system using cable sensor and mobile multimedia network
M Ujihira, S Ogawa, S Suzuki, S Hosoya, H Saeki, M Komazaki, K Hirama, M Kawakita
MINE PLANNING AND EQUIPMENT SELECTION 1998, 13, 4, 151, 156, 1998, [Peer-reviewed]
English, International conference proceedings

落石検知用ケーブルセンサの経時変化と出力波形の特性(共著)　　　　　　　　　　　　　　　
川村, 洋平
実地技術論文報告集, 14, 736-742, 1998
Japanese, Research society

Construction of deterioration, deformation and environment monitoring system for preventive conservation at Bayon
川村 洋平, 池田 啓, 宍戸 英彦, 河﨑 衣美, 北原 格, 丸太 寛之, 里 知樹, 松井 敏也, 月刊考古学ジャーナル, 736, 29, 34, Feb. 2020
ニュー・サイエンス社, Japanese

クラウドソーシングと3次元復元技術による世界遺産の予防的保存
宍戸 英彦, 河﨑 衣美, 伊藤 豊, 川村 洋平, 松井 敏也, 森嶋 厚行, 北原 格, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117, 443, 77, 82, Feb. 2018
電子情報通信学会, Japanese

2P4-10 The Effect of Temperature in Underground Mining on the Dust Control using Ultrasonic Atomization
Okawa Hirokazu, Nishi Kentaro, Kawai Naosuke, Kawamura Youhei, Sugawara Katsuyasu, Proceedings of Symposium on Ultrasonic Electronics, 36, "2P4, 10-1"-"2P4-10-2", 05 Nov. 2015
Steering committee of symposium on ultrasonic electronics, English

3P4-26 Removal of Arsenous Acid from Sulfuric Acidic Solutions using Ultrasound Oxidation and Iron Oxide(Poster Session)
Okawa Hirokazu, Yoshikawa Tomohiro, Hosokawa Ryota, Hangui Shingi, Matsunuma Takane, Osawa Takahiro, Kawamura Youhei, Sugawara Katsuyasu, Proceedings of Symposium on Ultrasonic Electronics, 35, 507, 508, 03 Dec. 2014
Steering committee of symposium on ultrasonic electronics, English

3P4-23 Application of Ultrasonic Atomization for improving dust control in underground mining(Poster Session)
Okawa Hirokazu, Nishi Kentaro, Kawamura Youhei, Kato Takahiro, Sugawara Katsuyasu, Proceedings of Symposium on Ultrasonic Electronics, 34, 475, 476, 20 Nov. 2013
Steering committee of symposium on ultrasonic electronics, English

3Pa4-8 Flotation separation of bitumen from oil sand using ultrasound irradiation and mixed gases in aqueous solution(Poster Session)
Saito Tomonao, Okawa Hirokazu, Kawamura Youhei, Babadagli Tayfun, Proceedings of Symposium on Ultrasonic Electronics, 33, 369, 370, 13 Nov. 2012
Steering committee of symposium on ultrasonic electronics, English

Investigation of thermal conductivity and heat characteristics of oil sands using ultrasound irradiation for shortening the preheating time
Shingo Kamagata, Youhei Kawamura, Hirokazu Okawa, Koichi Mizutani, Japanese Journal of Applied Physics, 51, 7, 07GE03-1, 07GE03-6, Jul. 2012, [Peer-reviewed]
English

1P1-L11 Development of DigBot for Monitoring the Underground Environment(Robotics and Mechatronics for Transportation and Manufacturing Machine)
HAYASHI Masahiro, MIYACHI Toshiyuki, KAWAMURA Youhei, MURAKAMI Kazutoshi, KATO Yuichi, ロボティクス・メカトロニクス講演会講演概要集, 2012, "1P1, L11(1)"-"1P1-L11(2)", 27 May 2012
A digging robot named "DigBot" has been developed by our laboratory for monitoring the underground environment and exploring the lunar surface. The purpose of this research is to develop the robot which can dig soil and sand automatically. In this proceeding, first, concept of DigBot is shown. As a basic research of developing Digbot, Contra-rotating drill is developed and made for trial purpose. And then digging experiment is carried out for verifying effectiveness through the Contra-rotating drill. It was proved that DigBot possess incomparably more power than ever before., The Japan Society of Mechanical Engineers, Japanese

The application of sonication for purifying soil contaminated with microorganism　　　　　　　　　　　　　　　
Takashi Nakamura, Hirokazu Okawa, Ryota Hosokawa, Tomonao Saito, Youhei Kawamura, Katsuyasu Sugawara, Jpn. J. Appl. Phys., 49, 7, 07HE11-1 - 07HE11-4, 2010

ソノケミストリーを用いたリチウムイオン二次電池用鉄系正極材料の合成　　　　　　　　　　　　　　　
大川浩一, 川村洋平, 佐藤峰夫, 超音波テクノ, 21, 2, 98, 102, 2009

超音波特殊反応場を利用した懸濁液中微粒子の沈殿方法
大川 浩一, 中村 貴司, 川村 洋平, ケミカルエンジニヤリング, 53, 5, 375, 379, May 2008
化学工業社, Japanese

会議報告 2007年 第28回超音波エレクトロニクスの基礎と応用に関するシンポジウム(USE 2007)
狩野 旬, 川村 洋平, 若槻 尚斗, 超音波techno, 20, 2, 112, 115,127, Mar. 2008
日本工業出版, Japanese

超音波特殊反応場を利用した懸濁液中微粒子の沈殿方法　　　　　　　　　　　　　　　
大川浩一, 中村貴司, 川村洋平, 菅原勝康, ケミカルエンジニヤリング, 53, 5, 47, 51, 2008

コンビナート配管における超音波検査手法の提案 (特集 最近の非破壊検査)
川村 洋平, 超音波techno, 18, 5, 17, 21, Sep. 2006
日本工業出版, Japanese

超磁歪振動子による地中配管の検知システム (特集 最近の非破壊検査)
川村 洋平, 河 宜成, 超音波techno, 18, 5, 6, 11, Sep. 2006
日本工業出版, Japanese

非破壊検査 超音波を用いた転石の根入れ深さ探査システムの構築
川村 洋平, 超音波techno, 17, 3, 71, 75, May 2005
日本工業出版, Japanese

ディーゼルエンジンの異常診断に関する文献の調査研究
川村 洋平, 氏平 増之, 樋口 澄志, 春季大会講演集. I, 資源編, 15, 1, 53, 54, 27 Mar. 2003
Japanese

波形解析によるディーゼルエンジンの異常診断に関する基礎研究 : ALMを用いる場合
石川 達也, ダウレン アクメトフ, 氏平 増之, 川村 洋平, 樋口 澄志, 春季大会講演集. I, 資源編, 15, 1, 55, 56, 27 Mar. 2003
Japanese

ディーゼルエンジンの燃焼異常の判定システムに関する研究
川村 洋平, 氏平 増之, 石川 達也, 樋口 澄志, 春季大会講演集. I, 資源編, 14, 1, 181, 182, 28 Mar. 2002
Japanese

採掘機械の振動データの伝送と異常診断処理速度について
川村洋平, 資源 素材2002秋季大会講演論文集, 2002

北海道の小規模露天掘り炭鉱と生産設備
氏平 増之, 川村 洋平, 樋口 澄志, 玉置 富康, 資源・素材, 2001, 257, 260, 24 Sep. 2001
Japanese

振動波形の分析による落下物重量の評価に関する研究
伊藤 史人, 氏平 増之, 川村 洋平, 今野 慎也, 安池 雅之, 樋口 澄志, 資源・素材, 2001, 395, 396, 24 Sep. 2001
Japanese

建設機械用ディーゼルエンジンの不燃気筒の判定に関する研究 : Wavelet 解析を用いた場合
川村 洋平, 氏平 増之, 樋口 澄志, 資源・素材, 2001, 14, 14, 24 Sep. 2001
Japanese

Wavelet解析によるディーゼルエンジンの不燃気筒の判定に関する研究
川村 洋平, 氏平 増之, 樋口 澄志, 駒崎 征明, 伊藤 史人, 一般発表(研究・業績発表)講演要旨集, 2001, 1, 256, 257, 01 Mar. 2001
Japanese

Burning condition diagnosis of the diesel engine of construction machinery by time-frequency analysis
KIRIMOTO Kenta, KAWAMURA Youhei, UJIHIRA Masuyuki, OGATA Sumitoshi, 電気学会研究会資料. IM, 計測研究会, 2000, 40, 13, 18, 05 Oct. 2000
Japanese

ディーゼルエンジンの不燃気筒の判定に関する研究
川村 洋平, 氏平 増之, 樋口 澄志, 中村 祥一, 駒崎 征明, 伊藤 史人, 一般発表(研究・業績発表)講演要旨集, 2000, 1, 132, 133, 29 Mar. 2000
Japanese

スチールワイヤ型ケーブルセンサによる落石検知のフィールド実験
氏平 増之, 川村 洋平, 徳永 哲信, 駒崎 征明, 伊藤 史人, 一般発表(研究・業績発表)講演要旨集, 2000, 1, 204, 205, 29 Mar. 2000
Japanese

スチールワイヤ型ケーブルセンサの感度に関する実験結果
氏平 増之, 川村 洋平, 徳永 哲信, 駒崎 征明, 伊藤 史人, 一般発表(研究・業績発表)講演要旨集, 2000, 1, 206, 207, 29 Mar. 2000
Japanese

ケーブルセンサの感度特性に関する研究(その1)
氏平 増之, 川村 洋平, 佐藤 昌志, 駒崎 征明, 平間 和夫, 一般発表(研究・業績発表)講演要旨集, 1999, 1, 227, 228, Mar. 1999
Japanese

Encyclopedia of Mathematical Geosciences　　　　　　　　　　　　　　　
Mining Modeling
Springer, Jul. 2022, 9783030260507, [Contributor]

Dhaka Megacity　　　　　　　　　　　　　　　
Kawamura,Youhei, Illustrating Quality of Life (QOL) in Dhaka City Corporation (DCC) area by integrating remote sensing and census data
Springer, 2013, English, Scholarly book, [Contributor]

よくわかる農業施設学会用語解説集,　　　　　　　　　　　　　　　
川村,洋平, 信号処理
2012, Japanese, Scholarly book, [Contributor]

ソノケミストリーを用いたリチウムイオン二次電池用鉄系正極材料の合成　　　　　　　　　　　　　　　
大川浩一, 川村洋平, 佐藤峰夫
超音波TECHNO, Mar. 2009, Japanese, Scholarly book, [Supervisor]

第17回鉱山設計および設備選択に関する国際会議ならびに中国鉱山設計および設備選択に関する展示に参加して　　　　　　　　　　　　　　　
川村洋平, 島田英樹
岩の力学ニュース, Jan. 2009, Japanese, Scholarly book, [Supervisor]

［研究室/プロジェクト紹介］ 筑波大学 川村研究室－Geo-Sensing－　　　　　　　　　　　　　　　
川村洋平
計測と制御, Oct. 2007, Japanese, Scholarly book, [Supervisor]

筑波大学 川村研究室-Geo Sensing-　　　　　　　　　　　　　　　
川村洋平
超音波TECHNO, Jan. 2007, Japanese, Scholarly book, [Supervisor]

超磁歪振動子による地中配管の検知システム　　　　　　　　　　　　　　　
川村洋平, 河宜成
超音波TECHNO, Sep. 2006, Japanese, Scholarly book, [Supervisor]

コンビナート配管における損傷探査　　　　　　　　　　　　　　　
川村洋平
超音波TECHNO, Sep. 2006, Japanese, Scholarly book, [Supervisor]

2006 SICE-ICASE International Joint Conference, Vols 1-13　　　　　　　　　　　　　　　
Kudo, Yuki, Aoshima, Nobuharu, Kawamura, Youhei, Study on estimation of the finite-length unknown input waveform from a given input waveform response
IEEE, Jan. 2006, 9788995003848, English, Scholarly book, [Contributor]

2006 SICE-ICASE International Joint Conference, Vols 1-13　　　　　　　　　　　　　　　
Ito, Yu, Kawamura, Youhei, Muzutani, Koichi, Kuraoka, Senro, Cepstrum analysis applied to ultrasonic reflection wave detection wave method to investigate the depth and the damage of the pile
IEEE, Jan. 2006, 9788995003848, English, Scholarly book, [Contributor]

2006 SICE-ICASE International Joint Conference, Vols 1-13　　　　　　　　　　　　　　　
Nagayama, Makoto, Kawamura, Youhei, Estimation of the engine revolution for statistical analysis of RMS value by using Prony method to detect misfiring cylinder of the diesel engine
IEEE, Jan. 2006, 9788995003848, English, Scholarly book, [Contributor]

超音波を用いた転石の根入れ深さ探査システムの構築　　　　　　　　　　　　　　　
川村洋平
超音波TECHNO, May 2005, Japanese, Scholarly book, [Supervisor]

Proposal of Environmentally Sustainable Mining Development System Utilizing "Smart Mining +"　　　　　　　　　　　　　　　
Youhei KAWAMURA, Natsuo OKADA
The 3R International Scientific Conference on Material Cycles and Waste Management（3RINCs 2024）, 17 Mar. 2024, English, Oral presentation

北大ー九大 共同資源工学専攻と資源系教育コンソーシアム　　　　　　　　　　　　　　　
川村 洋平
「大学院教育改革フォーラム2023」意見交換会, 01 Dec. 2023, Japanese, Nominated symposium
[Invited]

A Magnetic Climbing Robot for Steel Bridge Inspection　　　　　　　　　　　　　　　
Kawamura,Youhei
The 11th World Congress on Intelligent Control and Automation, 2014, English, Oral presentation
China, [International presentation]

The application of ZigBee Technology for underground Mine Communication and Monitoring Systems　　　　　　　　　　　　　　　
Kawamura,Youhei
Akita University Leading Program 2013 International Workshop, Sep. 2013, 秋田大学, English, Invited oral presentation
日本 秋田, [Invited], [Domestic Conference]

An Investigation of Radio Wave Attenuation for ZigBee Network in Underground Mines　　　　　　　　　　　　　　　
Kawamura,Youhei
The 3rd Int. Symposium on Soft Computing and Disaster Control 2013, 2013, English, Invited oral presentation
Indonesia Bali, [Invited], [International presentation]

Underground Blasting Optimization by Artificial Intelligence Techniques　　　　　　　　　　　　　　　
Kawamura,Youhei
The 3rd Int. Symposium on Soft Computing and Disaster Control 2013, 2013, English, Invited oral presentation
Indonesia Bali, [Invited], [International presentation]

Emergency Management with ZigBee and GIS　　　　　　　　　　　　　　　
Kawamura,Youhei
15th International Symposium on Computational Intelligence and Industrial Applications, 2012, English, Invited oral presentation
Japan Sapporo, [Invited], [Domestic Conference]

Development of DigBot for Monitoring the Underground Environment　　　　　　　　　　　　　　　
Kawamura,Youhei
15th International Symposium on Computational Intelligence and Industrial Applications, 2012, English, Oral presentation
Japan Sapporo, [Domestic Conference]

Long-Term Operation of Landslide observation System Using ZigBee Modules　　　　　　　　　　　　　　　
Kawamura,Youhei
The 1st International Workshop on Soft Computing and Disaster Control, 2011, English, Oral presentation
Indonesia Srabaya, [International presentation]

Development of DigBot for Surveying the Underground after the Disaster　　　　　　　　　　　　　　　
Kawamura,Youhei
The 1st International Workshop on Soft Computing and Disaster Control, 2011, English, Oral presentation
Indonesia Srabaya, [International presentation]

Underground Imaging Method Using Magnified Cross-Correlation Analysis　　　　　　　　　　　　　　　
Ha, Euiseong, Kawamura, Youhei, Mizutani, Koichi, Kamohara, Akihiro, Okawa, Hirokazu
28th Symposium on Ultrasonic Electronics, English, Oral presentation
[Domestic Conference]

磁着移動機構と磁界解析を用いた鉄道腐食検知センサシステムの開発　　　　　　　　　　　　　　　
宇津木隆裕, 川村洋平, 土方大輔
____, Japanese, Oral presentation
[Domestic Conference]

資源開発阻害微生物の超音波処理　　　　　　　　　　　　　　　
細川亮太, 斉藤知直, 大川浩一, 川村洋平
____, Japanese, Oral presentation
[Domestic Conference]

弾性波を用いたドリルビットの三次元位置推定法に関する基礎研究　　　　　　　　　　　　　　　
川村洋平, 田村潤平, 鎌形真伍, 持地英実
____, Japanese, Oral presentation
[Domestic Conference]

ZigBeeを用いた地すべり監視システムの長期運用性の評価・検討　　　　　　　　　　　　　　　
川村洋平, 中畑裕也, 蟹江迪子, 倉岡千郎, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

オイルサンドからのビチューメン回収における超音波利用の検討　　　　　　　　　　　　　　　
大川浩一, 斉藤知直, 細川亮太, 川村洋平
____, Japanese, Oral presentation
[Domestic Conference]

超磁歪震源を用いた極浅層領域のインバージョンイメージング　　　　　　　　　　　　　　　
川村洋平, 鎌形真伍, 中畑裕也, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

インバージョンアルゴリズムを用いた地中配管検知, 資源・素材学会　　　　　　　　　　　　　　　
川村洋平, 蒲原章裕, 水谷孝一, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

DIGBOT開発のための二重反転ドリル性能評価　　　　　　　　　　　　　　　
阿部亮平, 川村洋平, 松島亘志, 村上和利, 上島和志
____, Japanese, Oral presentation
[Domestic Conference]

比内緑色凝灰岩採石場における課題から開発された資源有効利用技術　　　　　　　　　　　　　　　
大川浩一, 中村貴司, 菅原勝康, 川村洋平
____, Japanese, Oral presentation
[Domestic Conference]

PVT装置における重油粘度簡易計測手法の開発　　　　　　　　　　　　　　　
川村洋平, 安藤寛, 大川浩一, 菅井裕一, 佐々木久郎
____, Japanese, Oral presentation
[Domestic Conference]

地中埋設物検知における楕円軌道輝度値法の有効性の検証　　　　　　　　　　　　　　　
蒲原章裕, 川村洋平, 大川浩一, 水谷孝一
____, Japanese, Oral presentation
[Domestic Conference]

Zigbeeを用いた斜面ネットワークの構築　　　　　　　　　　　　　　　
川村洋平, 駒井雄一, 太田敬一, 倉岡千郎, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

磁歪振動子を入力として用いた表面波探査に関する基礎研究　　　　　　　　　　　　　　　
蒲原章裕, 川村洋平, 中里槙吾, 大川浩一, 水谷孝一
____, Japanese, Oral presentation
[Domestic Conference]

磁界を用いた土石流中の礫の位置計測システムの提案　　　　　　　　　　　　　　　
杉山文乃, 川村洋平, 松島亘志, 倉岡千郎, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

楕円軌道輝度値法を用いた極浅層領域映像化手法の提案　　　　　　　　　　　　　　　
川村洋平, 蒲原章裕, 大川浩一, 水谷孝一
____, Japanese, Oral presentation
[Domestic Conference]

超磁歪振動子を用いた岩盤亀裂推定に関する研究　　　　　　　　　　　　　　　
浅香充慶, 川村洋平, 中里槙吾, 大川浩一, 水谷孝一
____, Japanese, Oral presentation
[Domestic Conference]

地中埋設物検知への震源オフセットによる表面波減衰の利用　　　　　　　　　　　　　　　
川村洋平, 蒲原章裕, 河宜成, 水谷孝一, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

土石流流下実験における磁界を用いた位置計測システムの提案　　　　　　　　　　　　　　　
杉山文乃, 川村洋平, 松島亘志, 倉岡千郎, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

PVT装置の粘度計測システムに関する基礎研究　　　　　　　　　　　　　　　
中里槙吾, 川村洋平, 宮川雄磨, 大川浩一
____, Japanese, Oral presentation
[Domestic Conference]

Development of Underground Mine Communication and Monitoring System by Using ZigBee Technology　　　　　　　　　　　　　　　
Kawamura,Youhei
8th Asian Rock Mechanics Symposium, Rock Mechanics, English, Oral presentation
Japan Sapporo, [Domestic Conference]

Prediction of Blast-Induced Ground Vibration at a Limestone Quarry and On-Going Project at WASM　　　　　　　　　　　　　　　
Kawamura,Youhei
Rock Breakage and Fragmentation Workshop 2014, English, Invited oral presentation
Indonesia Yogjakarta, [Invited], [International presentation]

Mine Geotechnical Engineering　　　　　　　　　　　　　　　
Curtin University
2012 - 2015

Rock Breakage　　　　　　　　　　　　　　　
Curtin University
2012 - 2015

Measurement Engineering　　　　　　　　　　　　　　　
University of Tsukuba
Apr. 2004 - Mar. 2011

Geo-Sensing　　　　　　　　　　　　　　　
University of Tsukuba
2004 - 2011

Development of Museum DX Technology for Efficient Utilization of Cultural Heritage Assets
Grants-in-Aid for Scientific Research
01 Apr. 2023 - 31 Mar. 2028
和田 浩, 齋藤 義朗, 川村 洋平, 鳥屋 剛毅, 北原 格
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Tokyo National Museum, 23H00024

地中熱・地下水熱利用による脱炭素型熱エネルギー供給システムの構築　　　　　　　　　　　　　　　
SATREPS
Apr. 2021 - Mar. 2027
JST, JICA, 秋田大学, Coinvestigator

Development of Rock and Soil Evaluation System by AI Technologies for Accelerating iConstruction and iControl
Grants-in-Aid for Scientific Research
01 Apr. 2022 - 31 Mar. 2026
川村 洋平, 北原 格, 鳥屋 剛毅, 澁谷 長史
以下の項目1を完了し、項目2および項目3を部分的に実施した。
項目1：HS波長領域/分割での岩石・土質物性スペクトル特性同定とデータベース構築に関して、HSカメラによる対象物の撮影により、HS波長領域/分割の画像情報によって岩種・風化度・湿潤度といった岩盤および土質の工学的特性に影響を与える要素（スペクトル特性）を定量的に評価できるかを明らかにした。結果、撮影手法の確立（標準化）とその手法に基づいたHSデータベースを構築できた。
項目2：機械学習による各要素の自動判定技術の開発に関して、開発する機械学習エンジンによって岩種・風化度・湿潤度の各パラメータを個別に自動判定できる個別エンジンを開発した。さらにディープラーニングエンジンの開発においてレイヤ数調整および目的関数調整を行い、それぞれの判定したい項目に特化した高精度なエンジン開発を目指した。各パラメータにおいて、使用岩種の違いはあれど、平均85％以上の正答率を得るに至っている。
項目3：深層学習による判定根拠の妥当性検証と次元削減に関して、判定エンジンの学習中間層の可視化（CAM）および近傍成分分析（NCA）によって判定根拠の妥当性を検証した。AIが岩種・風化度・湿潤度を判定する際に、どのスペクトル変化に判定根拠を持っているかを逆解析することによって、特徴量を残せる範囲でのHSの次元削減を行い、分割バンド数を減らした簡便なスペクトルカメラの設計とそれを用いた判定精度の検証を行った。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23K22850

Development of Rock and Soil Evaluation System by AI Technologies for Accelerating iConstruction and iControl
Grants-in-Aid for Scientific Research
01 Apr. 2022 - 31 Mar. 2026
川村 洋平, 北原 格, 澁谷 長史, 鳥屋 剛毅
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 22H01580

Co-creation of digital twin technology for efficient blasting in the Mining 4.0 era
Grants-in-Aid for Scientific Research
07 Oct. 2021 - 31 Mar. 2025
川村 洋平, 北原 格, 宍戸 英彦, 鳥屋 剛毅, 福田 大祐, 菊池 亮佑, PARK ILHWAN, 謝 淳
本共同研究は、世界の鉱業が目指す“2050年の低炭素型自動化・無人化鉱山操業”を牽引する次世代鉱山デジタルツインテクノロジーを開発するものである。自動化および無人化が最も必要とされる発破現場の切羽と発破起砕物（モックパイル）を対象に、３次元形状復元などの多次元情報処理と深層学習に代表される人工知能を統合することでCyber-Physical Blastingプラットフォームを構築する。その中で多様な発破シミュレーションおよび検証実験を繰り返し、モックパイル粒度分布推定や発破デザインなどの自動化システムを実装することにより、最適発破計画、発破効率向上、生産率向上、生産管理および安全管理を実現とするものである。
本研究チームは、鉱業界で世界随一の規模と研究体制を誇るの研究教育コンソーシアム“Mining Education Australia (MEA)”と関わりが深く、MEAが推し進める“未来のスマートマイニングに資する共同研究”に、本研究の研究成果である高度ICTを導入することで国際共同研究開発を加速・推進する。国内外の先進的な研究者で組織された学際研究チームが、上記コンソーシアムや海外資源採掘企業と緊密に連携しながら研究開発を実施することにより、実用化の先鞭を付けること目指す。
初年度である2021年度は研究スタートにあたり、チーム編成の見直しを図り、鉱業の上流から下流までをカバーできるよう若手研究者を呼び込んだ。結果、6名の若手研究と2名の教授にて共同研究を加速させるチーム構成とした。しかしながらコロナ禍で海外派遣が叶わなかったことから、国内での打ち合わせとZoomを主体としたWeb打ち合わせがメインの活動となった。海外拠点のCurtin大学とは夏期にWebinarを開催し十分な交流を実現した。国内では研究項目である採掘現場に適した多視点画像撮影方式の開発を完了した。
Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Hokkaido University, 21KK0070

ドローンの姿勢制御パラメータを活用した三次元風向風速計測装置の開発　　　　　　　　　　　　　　　
大成学術財団 2024年度 研究助成
Apr. 2024 - Mar. 2025
川村洋平, 岡田夏男
一般財団法人 大成学術財団, Principal investigator

Development of Algorithm for Estimating Seismic Damage of Buried Pipelines Using State-Vector Space on Road Surface Ground Failures
Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Pioneering)
Jun. 2022 - Mar. 2025
庄司 学, 永田 茂, 北原 格, 川村 洋平, 延原 肇, 丸山 喜久, 西尾 真由子
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Pioneering), University of Tsukuba, 22K18303

トンネル掘削現場における非接触湧水量計測技術の開発　　　　　　　　　　　　　　　
助成金
Apr. 2023 - Mar. 2024
一般財団法人一樹工業技術奨励会, Principal investigator

Development of the System of Cumulative Fatigue Estimating for the Art Objects Subject to Vibration During Transport
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Apr. 2020 - Mar. 2024
和田 浩, 川村 洋平, 小西 毅
平面形状と立体計上の代表として、屏風のオリジナルレプリカを用いた加振実験の結果を解析した。加振実験により、周波数毎の振動伝達特性を把握することができた。屏風のレプリカについては、骨下地と呼ばれる基本構造上で生じた振動が表面の和紙にどのように影響するのかについてさらに検証を進めた。検証に必要なシミュレーション解析を実施し、モデル化に向けての準備を開始した。今年度の研究成果については、以下に示す複数の学術会議にて報告することができた。
「施設内での文化財輸送時に台車上で生じる振動への対策」(文化財保存修復学会第42回大会 2020年7月10日)／「美術品レプリカを用いた加振実験について」(日本包装学会第29回年次大会研究発表会 2020年7月15日)／「輸送時に屏風構造を持つ美術品に発生する共振現象に関する基礎的研究」(日本文化財科学会第37回大会 2020年9月5日)／「屏風構造を持つ美術品の振動応答に関する基礎的研究」(日本機械学会2020年度年次大会 2020年9月16日)／「美術品に用いられる包装資材の評価に関する現状と課題」(JPI（日本包装技術協会）北海道支部2020年度包装懇話会 2020年11月25日)
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Tokyo National Museum, Coinvestigator, 20H01383

資源採掘における掘削異常のAI診断に資する掘削補助装置の開発　　　　　　　　　　　　　　　
Aug. 2022 - Jul. 2023
MMCリョウテック株式会社, Principal investigator

トンネリングのための岩種のAI判別に資するハイパースペクトル撮影技術の開発　　　　　　　　　　　　　　　
Nov. 2021 - Mar. 2023
五洋建設株式会社

ハイパースペクトルと人工知能を活用した岩盤・土壌自動評価装置の開発　　　　　　　　　　　　　　　
A-Step トライアウト
Oct. 2020 - Mar. 2022
JST, 北海道大学, Principal investigator

Development of underground drone for tailings dam investigation
Grants-in-Aid for Scientific Research Challenging Research (Exploratory)
29 Jun. 2018 - 31 Mar. 2021
KAWAMURA YOUHEI
The aim of this research is to develop underground drone which can investigate the inside of tailing-dam in mine site. This research project had 4-stages.The 1st one was "Development of contra-rotating drill". The 2nd one was "Designing 3-D Snake locomotion thrust mechanism". The 3rd one was "Motor torque optimization by machine learning". The last one was "Validation test with the prototype". The validation test in real sand tank with all implemented prototype has been conducted. As a result, partial optimization of both drilling and trusting were achieved, overall optimization has not been achieved, though. However, it was confirmed that the snake locomotion thrust mechanism had a big potential for free movement in slurry tank.
Japan Society for the Promotion of Science, Challenging Research (Exploratory), Akita University, 18K18872

ハイパースペクトルカメラに係るデータ分析支援，分析基礎データ取得　　　　　　　　　　　　　　　
Apr. 2020 - Mar. 2021
日本工営, 秋田大学, Principal investigator

AIによるトンネリング技術の開発　　　　　　　　　　　　　　　
Apr. 2019 - Mar. 2021
鹿島建設, 秋田大学, Principal investigator

ハイパースペクトル撮影技術の開発　　　　　　　　　　　　　　　
Mar. 2019 - Apr. 2020
五洋建設, 秋田大学, Principal investigator

Development of safe transportation system integrating vibration characteristics of art works, transport vehicles, packaging materials
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
01 Apr. 2016 - 31 Mar. 2020
wada hiroshi
In this study, vibrations were measured on a transportation system used for transportation of works of art, and vibration data were analyzed in all processes of each transportation of land, sea and air. Using the analysis results, the vibration environment during transportation was reproduced, and the measurement method and evaluation method of the response of the packaging material that received the vibration were established. Furthermore, we succeeded in grasping the phenomenon that accumulated fatigue occurs in the art material subject to vibration, and succeeded in verifying that even a small acceleration can cause deterioration of the art material gradually. Focusing on the vibration that occurs on the transportation system, we were able to verify the existence of the accumulated fatigue phenomenon, which is a risk of damage to cultural properties if they continue to be vibrated for a long time.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Tokyo National Museum, 16H03109

Development of monitoring system for Bayon temple preservation and conservation
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
01 Apr. 2016 - 31 Mar. 2020
Kawamura Youhei
Historical monuments, archaeological sites and their surrounding structures found in World Heritage Sites (WHSs) all throughout the world have great cultural or physical significance. However, many of these WHSs are subject to decay and destruction from both natural and man-made events such as tourist activity. The study believes that it is possible to realize long-term and sustainable WHS monitoring by utilizing Information and Communication Technology (ICT). In this study, Bayon temple was selected as an application of the proposed monitoring system. The progressive deterioration of bas-reliefs found in the ruins require rapid and high-frequency monitoring; by utilizing fixed camera photography with multiple viewpoints, three-dimensional models holding color information are created and archived on a real-time basis measurement and communication system. Based on measured performance of the communications system, a schematic design of the monitoring system for WHSs has been developed.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Akita University, 16H05636

３Dフォトグラメトリーによる発破ずりの粒度分布計測に関する研究　　　　　　　　　　　　　　　
石灰石利用に関する基礎研究
Apr. 2019 - Mar. 2020
石灰石鉱業協会, Principal investigator

振動解析による掘削補助装置の開発　　　　　　　　　　　　　　　
Apr. 2018 - Mar. 2020
MMCリョウテック, 秋田大学, Principal investigator

Development of Seismic Damage Estimation System for Lifeline Networks Subjected to Multiple Effects of Extreme Ground Motions and Liquefaction
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Apr. 2016 - Mar. 2020
Shoji Gaku
This study enhanced the accuracy of damage functions describing the nonlinear relationship between the seismic intensity and the quantified damage level, which are constituted in the following seismic damage estimation system, from the big-data analyses related with the seismic disasters for lifeline networks suffered by the multiple effects of extreme ground motions and liquefaction in the previous earthquakes. Based on these theorical approach, a new seismic damage estimation system of the lifeline networks was developed, which consists of four sub-systems: sub-system A of capturing spatial data on ground motion intensities, sub-system B of estimating lifelines damage distributed in a target region, sub-system C of sending associated disaster digital information and sub-system D of visualizing damage estimation data, with considering the maximization of the associated usability for local government officers and facility managers in the case of using the proposed system.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), University of Tsukuba, 16H01842

アンコール遺跡群における砂岩浮き彫りの包括的な保存修復に関する研究　　　　　　　　　　　　　　　
科学研究費補助金 基盤研究(A)
2013 - 2016
松井敏也
協力者
日本学術振興会, Competitive research funding

災害発生後の人的被害把握に関する研究　　　　　　　　　　　　　　　
日本‐インドネシア二国間交流事業
2011 - 2013
安信誠二
分担者
日本学術振興会, Competitive research funding

Fundamental Study on Non-destructive Testing Method for Foundation Pile using Giant-magnetostriction Vibrator　　　　　　　　　　　　　　　
2013
川村洋平
Principal investigator, Competitive research funding

Improving Student’s Strategic and Technical Skills through a Meaningful Interaction with Mining Industry　　　　　　　　　　　　　　　
2013
Erkan Topal
Institute of Mining & Metallurgy, Competitive research funding

ZigBeeを用いた地すべり監視ユビキタスセンシングネットワークの構築
Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
2011 - 2012
川村 洋平, 太田 敬一
本研究では、無線通信の標準規格のひとつであるZigBeeを活用した斜面監視システムを提案している。ZigBeeを採用した理由は以下の2つの観点からである。
1)一つのネットワークに接続できる端末が多いことから対象斜面全体に柔軟にネットワーク構築ができる。
2)マルチホップ機能により、端末同士が相互にデータを転送し合うことにより、斜面の麓までデータ伝送することができる。
麓まで伝送されたデータは、公衆回線を利用して任意の計測室まで転送することができる。広域な地すべり斜面にZigBee設置する場合、接続形態としてデータ伝送を端末同士連携しながら行うことができるメッシュ型を用いる必要がある。メッシュ型を用いる場合、ZigBeeをZigBeeルータとして設定するがZigBeeルータは定期的に通信できることを確認するため端末は常に起動しており、待機電力が大きくなる。この電源消費量の問題に対する対策方法として本研究では、ZigBeeルータでありながらスリープが可能なGeoSenseを開発し斜面監視システムとして動作させた。また、315MHz特定小電力無線帯および413MHzアマチュア無線帯を起動信号として利用するトリガシステムを開発した。各ZigBeeにトランスミッタと、レシーバ組み込み、スイッチが入ったZigBeeは、周辺のZigBeeを起動させるために起動信号の電波を送る。周辺のZigBeeは、レシーバで起動信号を受信してZigBeeを起動させネットワークを自律的に構築できるようにした。
最終年は実際に地すべりが発生している地すべり警戒地域に本システムを設置し実規模計測を行った。計測期間に地すべりが発生しなかったことから、地すべりをトリガとした計測は実現できなかったが、人為的にトリガを超えさせることにより、すべてのZigBeeメードが起動し.ネットワークを構築できることを確認した。
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, University of Tsukuba, Principal investigator, Competitive research funding, 23651176

百kHz帯超音波を用いたオイルサンドからのビチューメン 高効率抽出技術に関する基礎研究　　　　　　　　　　　　　　　
出資金による受託研究
Aug. 2010 - Jul. 2011
大川 浩一
本研究課題はオイルサンドから超重質油・ビチューメンを熱水抽出する過程において超音波を補助的に使用し、高効率に回収することを目的とした基礎研究である。カナダのアルバータ州産および秋田県二ツ井町産オイルサンドを対象とし、超音波は、溶液中に均一および広範囲に微細気泡を生成することができる数百kHzを使用する。超音波を用いることで、どの程度まで低温で、かつ低薬品添加量で回収することができるか検討する。
ＪＯＧＭＥＣ, Competitive research funding

小型地盤・月面掘削ロボット（DigBot）の開発」　　　　　　　　　　　　　　　
出資金による受託研究
Apr. 2010 - Mar. 2011
川村洋平
JST A-STEP(フリージビリティスタディ)
ＪＳＴ, Principal investigator, Competitive research funding

地面掘削用小型ロボットにおける二重反転ドリルビットの開発　　　　　　　　　　　　　　　
国内共同研究
Jul. 2009 - Mar. 2011
川村洋平
(株)ユニバンス, Principal investigator, Competitive research funding

Recovery of bitumen from Alberta oil sand using ultrasound irradiation
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
2010 - 2011
OKAWA Hirokazu, KAWAMURA Youhei, KODA Shinobu, SASAKI Kyuro, SUGAI Yuichi
Low (28 kHz) and high (200 kHz) frequency sonication combined with hot water treatments at 45 and 85℃ were investigated to assess the effects of different ultrasound frequencies and water temperatures on the recovery of bitumen from oil sand. A mechanical stirrer was also used to compare the efficiency of separation. Bitumen recovery tests were performed under argon, air, and nitrogen atmospheres. Sonication at 200 kHz was shown to recover bitumen effectively from oil sand at 85℃. For low temperature (45℃) solutions, only sonication at 28 kHz could recover bitumen from oil sand, demonstrating that sonication at 28 kHz can effectively breakdown the oil sand aggregates into a suspension. Hydrogen peroxide was also used to confirm the positive role for bitumen recovery. The role of highly concentrated H_2O_2 (>100 ppm) to recover bitumen during sonication was investigated. Hydrogen peroxide formed a bubble around the bitumen, which made it rise more easily to the solution surface during sonication. The result showed a good recovery rate of bitumen.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Akita University, Competitive research funding, 22760648

川村プロジェクト　　　　　　　　　　　　　　　
筑波大学産学連携プロジェクト
2011
川村洋平
筑波大学学内プロジェクト奨励研究, Principal investigator, Competitive research funding

国際連携プロジェクト海外長期派遣　　　　　　　　　　　　　　　
筑波大学国際連携プロジェクト
2011
川村洋平
筑波大学, Principal investigator, Competitive research funding

地面掘削用小型ロボットにおける組込み制御部の開発　　　　　　　　　　　　　　　
国内共同研究
Jul. 2009 - Mar. 2010
川村洋平
（株）北海道電子機器, Principal investigator, Competitive research funding

ZigBeeによる土木ユビキタスネットワークの開発　　　　　　　　　　　　　　　
その他
Sep. 2008 - Mar. 2010
川村洋平
奨学寄附金
日本工営（株）, Principal investigator, Competitive research funding

波の定規で世界を測る　　　　　　　　　　　　　　　
研究成果公開促進費
2010 - 2010
川村洋平
日本学術振興会, Principal investigator, Competitive research funding

PVT装置における粘度計測装置の開発に関する研究　　　　　　　　　　　　　　　
出資金による受託研究
Aug. 2008 - Mar. 2009
川村洋平
（財）石油天然ガス・金属鉱物資源機構, Principal investigator, Competitive research funding

RPD研究開発における地耐力計測　　　　　　　　　　　　　　　
その他
Dec. 2007 - Mar. 2008
川村洋平
請負研究
（株）丸順エンジニアリング、関東財務局, Principal investigator, Competitive research funding

RPD研究開発における液状化計測　　　　　　　　　　　　　　　
その他
Dec. 2007 - Mar. 2008
川村洋平
請負研究
（株）丸順エンジニアリング、関東財務局, Principal investigator, Competitive research funding

Research on the New Method to Precipitate Green Tuff Suspension using Ultrasound Irradiation
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
2007 - 2008
OKAWA Hirokaz, KAWAMURA Youhei, SATO Mineo, UEMATSU Kazuyoshi, SASAKI Kyuro, KODA Shinobu, YASUDA Keiji, SUGAWARA Katsuyasu
比内緑色凝灰岩懸濁液を中心に、超音波の化学反応を利用した新規凝集方法を検討した。比内緑色凝灰岩懸濁液はpH7 でゼータ電位-40mV を有すが、pH4 で0mV となり沈殿することが明らかとなった。そこで高周波数域の超音波を懸濁液へ照射することにより得られるラジカルや硝酸に着眼し、ゼータ電位0mV であるpH 域まで照射することで、緑色凝灰岩懸濁液から懸濁粒子を沈殿回収することに成功した。本研究は高周波数の超音波照射により、水と空気から沈殿に必要な酸性化剤を生成するため、外部からの薬品添加を一切必要としなかった。超音波照射による酸性化は、溶存空気量に依存するため、溶液の温度が低いほどその効率は高いことが明らかになった。また、高周波数の照射では粒子の微細化は抑制されていた。緑色凝灰岩のみならず、他の懸濁液に対しても有効であった。
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Akita University, Competitive research funding, 19760586

A Constitutive Model and Numerical Simulation Method Applicable to Slow to Rapid Ground Flow Based on Micromechanics
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
2006 - 2008
YAMADA Yasuo, MATSUSHIMA Takashi, KAWAMURA Yohei, IMAIZUMI Fumitoshi, KURAOKA Senro, KONAGAI Kazuo
本研究では、液状化のような比較的低速度地盤流動から、土石流のような高速流動までを統一的に表現できる構成モデルの形式を、土粒子運動をベースに構成した。また、石礫型土石流の流体力に及ぼす粒子サイズの影響についても理論的検討を行った。更に、そのような地盤流動を、統一的に表現する解析手法としてSPH法を用い、その「粒子性」を利用して様々な地盤流動を比較的簡便に再現できることを示した。地盤流動実験や観測のための新手法の開発も行った。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), University of Tsukuba, 18360223

Stability assessment for rock slope using giant-magnetostriction vibrator
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
2006 - 2008
KAWAMURA Youhei
本研究では超磁歪振動子を入力に用いて岩盤斜面の安定性を評価すための手法を確立するために、コンクリートブロックの寸法推定実験及び実規模実験として凝灰岩の採石場にて凝灰岩の損傷検査を行った。解析手法として相互相関法、信号圧縮法、およびケプストラム解析を適用した。それぞれの解析の結果、ケプストラム解析が最も簡易な計測方法で良好な結果を得られることを確認した。また、その適用性を向上させるために、入力波形として連続した正弦波及び正弦波1波を適用し、入力波形に応じた改善策を提案した。
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), University of Tsukuba, Principal investigator, Competitive research funding, 18760357

土粒子運動から構築する低速～高速地盤流動構成モデルの開発と応用　　　　　　　　　　　　　　　
科学研究費助成事業基盤研究（B)
2006 - 2008
山田恭央
分担者
日本学術振興会, Competitive research funding

表面波探査によるロータピックドレン工法の検証　　　　　　　　　　　　　　　
その他
Oct. 2006 - Mar. 2007
川村洋平
奨学寄附金
Principal investigator, Competitive research funding

Development Research for Crop Growth Environment Sensing Grid in Large-scale Spaces
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
2005 - 2007
MIZUTANI Koichi, WAKATSUKI Naoto, KAWAMURA Youhei, SASE Sadanori, OKUSHIMA Rimi, ISHII Masahisa
In the large-scale agricultural management, to improve the efficiency of productivity, it is necessary for farming industry to monitoring air temperature, fog, geologic condition, and condition, and soil property, etc. Our research intended to project a new observation system called "sensing grid" for the large-scale space to monitor the parameters for crop growth environment. We focused our attention on the sound velocity that has relationship between these parameters, and assembled theories between the velocity and the parameters. Based on these theories, we proposed a sound probe system that enables to precisely measure space mean values of air temperature and wind velocity by measuring time-of-flight of sound. As experimental results, we appraised relationship between parameters and sound velocity by using the sound probe. To enable monitoring environment in large-space by the sound probe more easily, we expanded this system and proposed a network acoustic sensing system. In this system, the probes transmit and wirelessly receive a measured data each other. We realized the monitoring various parameters in more long and wide area with simple and effective technique. The experimental results suggest that the parameters for the crop growth environment can be obtained by the network sensor system. Two dimensional distributions of wind direction and wind velocity and temperature were measured by the sound probes and reconstructed by the CT method. We also proposed network sensing grid monitoring system to enable monitoring system to enable monitoring environment in large-space. By using this system, we can methodically obtain various parameters. This system consists of acoustic sensors that are dispersed in grid pattern. We can get parameters from controller that consolidates each parameter from arbitrary combination of sensors. Moreover. Unit-cell method allows this system more greater flexibility. We get temperature distribution by matrix method with one unit-cell. These obtained results suggest that our system can make a contribution for not only large-scale bioplant by offering environment-control and improving the efficiency of crop productivity but also protected horticulture engineering, or whole industry.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), University of Tsukuba, Competitive research funding, 17380149

ローテータ方式杭工法に関する研究　　　　　　　　　　　　　　　
その他
Oct. 2005 - Mar. 2006
川村洋平
（株）丸順重工, Principal investigator, Competitive research funding

ローテータ方式砕石杭工法に関する研究　　　　　　　　　　　　　　　
企業からの受託研究
Oct. 2005 - Mar. 2006
金久保利之
丸順重工（株）, Competitive research funding

セラミック圧電素子を用いた超音波直接加振による転石根入れ深さ探査
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
2004 - 2005
川村 洋平
近年、自然災害による被害が多発している。その多くは落石による被害である。転石は岩石の一部が地表面に露出している以外は地中に埋っているため、その体積・根入れ深さの調査は容易ではない。この転石が多量の雨や地震等により落石となる。本研究は露岩部からの調査により、転石の根入れ深さを推定することを目的としている。転石根入れ深さを推定可能となれば、その転石の安定度が判別できる。従来法としては弾性波の入力部にハンマーを用いている。この手法は大きな入力を発生させることができる反面、精度および再現性に問題があった。一方、精密機械や構造物に対し、非破壊検査で用いられる手法としては超音波法が挙げられる。こちらは精度が高い反面、探査深度が浅くなるという問題があった。
本研究ではこれらの問題点を解決すべく、高精度で探査深度の深い転石根入れ深さ探査システムの構築を行った。入力部には圧電セラミックス、受信部には高感度AEセンサを採用することにより、大出力、高精度を実現することが可能となった。
基礎実験には長軸900mmのコンクリートブロックと1400mmの白御影石を使用、実規模実験においては地中に埋められている長軸1360mmの街頭基礎を供試体として用いた。解析手法としてはチャープ波を使った自己相関分析および正弦波・チャープ波を使ったケプストラム解析を行った。その結果、実規模においても誤差5%以内で良好な根入れ深さ推定を行うことに成功した。自己相関分析においては条件に合った入力波を作成することが出来れば誤差1%以内の非常に良好な結果が得られるが、その条件を満たすのが困難である。ケプストラム解析においては入力振幅を大きくすることにより、ある程度の結果が見込める。これらを統合することによりシステムの完成度が飛躍的に向上する結果となった。
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), University of Tsukuba, 16760387

セラミック圧電素子を用いた超音波直接加振による転石根入れ深さ探査　　　　　　　　　　　　　　　
若手研究(B)
2005
川村洋平
日本学術振興会, Principal investigator, Competitive research funding

Development of management system of Construction machinery using mobile multimedia network.　　　　　　　　　　　　　　　
Competitive research funding

鉱石の判別方法及び、鉱石の選別方法　　　　　　　　　　　　　　　
Patent right, 川村洋平, 柴山敦, 芳賀一寿, JX金属、秋田大学
特願2020-149395, 2020

風向風速計測方法及び風向風速計測システム　　　　　　　　　　　　　　　
Patent right, 川村洋平, 伊達央, 秋田大学
特願2019-074309, 01 Dec. 2019

対象物推定装置　　　　　　　　　　　　　　　
Patent right, 川村洋平, 安達毅, 伊藤豊, 秋田大学、安藤・間
特願2017-083872, 2017

三次元被写体形状推定装置　　　　　　　　　　　　　　　
Patent right, 川村洋平, 北原格, Jang Hyongdoo, 筑波大学
特願2016-008446, 2016

地中移動体位置推定システム　　　　　　　　　　　　　　　
Patent right, 川村洋平, 田村潤平, 筑波大学
特願2010-200351, 07 Sep. 2010
地中移動体の位置を弾性波によって計測する

ドリルヘッド位置推定システム　　　　　　　　　　　　　　　
Patent right, 川村洋平, 田村潤平, 持地英実, 佐々木直人, 筑波大学、（株）多田建設
特願2010-200096, 07 Sep. 2010
ＨＤＤ工法におけるドリルビット先端位置を弾性波によって計測する

掘削装置　　　　　　　　　　　　　　　
Patent right, 川村洋平, 土方大輔, 筑波大学、ユニバンス、北海道電子機器
2009-189417号, Oct. 2009

掘削装置　　　　　　　　　　　　　　　
Patent right, 川村洋平, 阿部亮平, 筑波大学、北海道電子機器
特願2009-154197号, Jun. 2009

掘削装置およびドリルビットユニット　　　　　　　　　　　　　　　
Patent right, 川村洋平, 阿部亮平, 飯高, 筑波大学
特願2009-063326号, 20 Mar. 2009

2次元画像データ生成方法および探査装置　　　　　　　　　　　　　　　
Patent right, 河宜成, 川村洋平, 筑波大学
特願2008-051222号, 01 Nov. 2008

埋没物体の非破壊形状診断およびその装置　　　　　　　　　　　　　　　
Patent right, 川村洋平, （株）日本工営
特願2004-260634号, 01 Sep. 2004

不燃気筒検出装置　　　　　　　　　　　　　　　
Patent right, 川村, 洋平, 氏平増之
特願2000-28000号, 2000

三菱商事株式会社研修（資源講座）　　　　　　　　　　　　　　　
15 Nov. 2023
Lecturer
三菱商事株式会社

サイエンスレクチャー2023　　　　　　　　　　　　　　　
14 Oct. 2023
Lecturer
Seminar
読売新聞北海道支社

サイエンス・カフェ札幌　　　　　　　　　　　　　　　
10 Sep. 2023
Appearance
Seminar
北海道大学 大学院教育推進機構 オープンエデュケーションセンター、科学技術コミュニケーション教育研究部門（CoSTEP）

旭川工業高等専門学校出前授業　　　　　　　　　　　　　　　
06 Sep. 2023
Lecturer
Visiting lecture
旭川工業高等専門学校

住友商事株式会社研修（採鉱学・発破）　　　　　　　　　　　　　　　
11 Jul. 2023
Lecturer
住友商事株式会社

北大道新アカデミー　　　　　　　　　　　　　　　
20 May 2023
Lecturer
株式会社道新文化センター

双日株式会社研修（鉱山開発技術のDX）　　　　　　　　　　　　　　　
27 Feb. 2023
Lecturer
双日株式会社

三菱商事株式会社研修（鉱山工学）　　　　　　　　　　　　　　　
Nov. 2020
Lecturer
Visiting lecture
三菱商事株式会社

帯広柏葉高校出前講義（スマートマイニング）　　　　　　　　　　　　　　　
Jun. 2020
Lecturer
Visiting lecture
帯広柏葉高校

住友商事株式会社研修（鉱山工学）　　　　　　　　　　　　　　　
Nov. 2019
Lecturer
Visiting lecture
住友商事株式会社

防災テクノロジーの進化　　　　　　　　　　　　　　　
Aug. 2019 - Sep. 2019
Lecturer
Lecture
秋田大学
秋田大学国際資源学部公開講座

秋田大学国際資源学部公開講座　　　　　　　　　　　　　　　
2019
Lecturer
Lecture
秋田大学

院内銀山を利活用した地域発展　　　　　　　　　　　　　　　
Oct. 2017
Advisor, Planner
Others
湯沢市

学際的資源開発研究会（会長）　　　　　　　　　　　　　　　
2017
Planner
川村洋平

Clean power initiative boosts energy access in Tajikistan　　　　　　　　　　　　　　　
Dec. 2023
Other than myself
Nature Portfolio
Nature Portfolio
[Paper]

製鉄でもCO2減豪中連携（分析）　　　　　　　　　　　　　　　
Nov. 2019
Other than myself
日本経済新聞
コメント, [Paper]

5年で大化け！サイエンス＆ベンチャー105発　　　　　　　　　　　　　　　
Oct. 2019
Other than myself
週刊 ダイヤモンド
月面開発, [Paper]

秋田大アフリカ資源シンポ開く　　　　　　　　　　　　　　　
Dec. 2018
Other than myself
日刊産業新聞
[Paper]

どうする地域活性化　　　　　　　　　　　　　　　
Dec. 2018
秋田さきがけ新報
[Paper]

バーチャルで見る 院内銀山と院内の町並み　　　　　　　　　　　　　　　
Apr. 2018
Other than myself
ABSラジオ
Radipal
[Media report]

鉱山VR　　　　　　　　　　　　　　　
Dec. 2017
AKT秋田テレビ
プライムニュース秋田
[Media report]