Tsutsui Hiroshi
| Faculty of Information Science and Technology Media and Network Technologies Information Communication Systems | Associate Professor |
| Institute for the Promotion of Business-Regional Collaboration | Associate Professor |
Last Updated :2025/06/07
■Researcher basic information
Researchmap personal page
Home Page URL
J-Global ID
Research Field
Educational Organization
- Bachelor's degree program, School of Engineering
- Master's degree program, Graduate School of Information Science and Technology
- Doctoral (PhD) degree program, Graduate School of Information Science and Technology
■Career
Career
- Apr. 2019 - Present
Hokkaido University, Faculty of Information Science and Technology, Associate Professor, Japan - May 2013 - Mar. 2019
Hokkaido University, Graduate School of Information Science and Technology, Associate Professor, Japan - Apr. 2010 - Apr. 2013
Kyoto University, Graduate School of Informatics, Assistant Professor - Apr. 2007 - Mar. 2010
Osaka University, Graduate School of Information Science and Technology, Assistant Professor - Apr. 2005 - Mar. 2007
Kyoto University, Graduate School of Informatics, Assistant Professor
Educational Background
Committee Memberships
- Jan. 2016 - Present
IEEE Hokkaido University Student Branch, Counselor, Society - Jan. 2021 - Dec. 2022
IEEE Sapporo Section, Student Activities Committee Chair, Society - 2022
SASIMI 2022 (The 24th Workshop on Synthesis And System Integration of Mixed Information technologies) Publication Chair - 2021
SASIMI 2021 (The 23rd Workshop on Synthesis And System Integration of Mixed Information technologies), Publication Chair - 2021
2021 International Symposium on Communications and Information Technologies (ISCIT 2021), Publication Chair, Others - 2021
2021 International Workshop on Smart Info-Media Systems in Asia (SISA 2021), General Chair, Others - 2020
IEEE TENCON 2020, Japan Sections Supporting Committee Member - 2019
2019 IEEE International Symposium on Circuits and Systems (ISCAS 2019), Management Co-Chair, Others - May 2012 - May 2014
電子情報通信学会 基礎境界ソサイエティ スマートインフォメディアシステム研究会, 幹事, Society - 2013 - 2013
2013 International Workshop on Smart Info-Media Systems in Asia (SISA 2013), Technical Program Committee Member, Society - 2013
ISPACS 2013, Publicity Chair, Society - May 2010 - May 2012
電子情報通信学会 基礎境界ソサイエティ スマートインフォメディアシステム研究会, 幹事補佐, Society - 2012 - 2012
2012 International Workshop on Smart Info-Media Systems in Asia (SISA 2012), Technical Program Committee Member, Society - 2011 - 2011
2011 International Workshop on Smart Info-Media Systems in Asia (SISA 2011), Technical Program Committee Member, Society - 2011 - 2011
2011 International Workshop on Smart Info-Media Systems in Asia (SISA 2011), General Secretary, Society - 2011 - 2011
電子情報通信学会2011年ソサイエティ大会 プログラム編成委員会, 委員, Society - 2010 - 2010
2010 International Workshop on Smart Info-Media Systems in Asia (SISA 2010), Technical Program Committee Member, Society - 2010 - 2010
電子情報通信学会2010年ソサイエティ大会 プログラム編成委員会, 委員, Society - 2009 - 2009
2009 International Workshop on Smart Info-Media Systems in Asia (SISA 2009), Technical Program Committee Member, Society - 2008 - 2008
2008 International Workshop on Smart Info-Media Systems in Bangkok (SISB 2008), General Secretary, Society - 2007 - 2007
SASIMI 2007, Technical Program Committee, Member, Society - 2006 - 2006
ITC-CSCC 2006, General Secretary, Society
■Research activity information
Awards
- Oct. 2013, SASIMI Organizing Committee, SASIMI 2013 Outstanding Paper Award
Place-and-Route Algorithms for a Reliability-Oriented Coarse-Grained Reconfigurable Architecture Using Time Redundancy
Takashi Imagawa;Masayuki Hiromoto;Hiroshi Tsutsui;Hiroyuki Ochi;Takashi Sato, International society - Oct. 2009, IEEE/ACM/IFIP, 7th IEEE/ACM/IFIP Workshop on Embedded Systems for Real-Time Multimedia (ESTIMedia2009) Best Paper Award
A high-throughput pipelined architecture for JPEG XR encoding
Koichi Hattori;Hiroshi Tsutsui;Hiroyuki Ochi;Yukihiro Nakamura, International society - Jul. 2008, IPSJ, Multimedia, Distributed, Cooperative and Mobile Symposium 2008 (DICOMO2008) Excellent Paper Award
Dynamic Rate Control for Media Streaming in High-speed Mobile Network
Masayuki Hiromoto;Hiroshi Tsutsui;Hiroyuki Ochi;Tomoyuki Osano;Norihiro Ishikawa;Yukihiro Nakamura, Japan society - Sep. 2007, IEICE, IEICE Society Conference, Video Compression Contest, First Prize
Video Coding Scheme for Video Sequences Degraded by Noise of Old Motion Picture Films
Hiroshi Tsutsui, Japan society - Sep. 2005, IEICE, IEICE Young Researcher's Award
Efficient SRAM Architecture for JPEG2000 Entropy Coder
Hiroshi Tsutsui;Hiroki Sugano;Takahiko Masuzaki;Hiroyuki Ochi;Takao Onoye;Yukihiro Nakamura, Japan society - May 2001, PARTHENON Technical Society, PARTHENON Technical Society, ASIC Design Contest, Award of Excellence
Design of 16bit Free CPU
Hiroshi Tsutsui;Takahiko Masuzaki, Japan society - May 2000, PARTHENON Technical Society, PARTHENON Technical Society, ASIC Design Contest, Encouragement Award
Design of 16bit Free CPU
Ryusuke Miyamoto;Hiroshi Tsutsui;Ryuta Nakanishi, Japan society
Papers
- Power Consumption and Prototype Evaluation of IoT Devices for Environmental Monitoring Systems.
Kota Hirai, Hiroshi Tsutsui, Ying He, Takeo Ohgane
ISCIT, 231, 234, 2023
International conference proceedings - Experimental Evaluation and Field Tests of LoRa Energy Consumption Optimization Approach Using Software-Defined Radio
Kyotaro Kunii, Takuya Yasugi, Hiroshi Tsutsui, Takeo Ohgane
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 45, 50, Sep. 2022, [Peer-reviewed]
English, International conference proceedings - Classification of Rich-Classes but Scarce-Samples Images via Multi-modeling: the Humpback Whale Epitome.
Haojiong Wang, Hiroshi Tsutsui, Matteo Convertino
4th IEEE Global Conference on Life Sciences and Technologies(LifeTech), 286, 288, IEEE, 2022
International conference proceedings - 2021 International Workshop on Smart Info-Media Systems in Asia:(SISA 2021，スマートインフォメディアシステム国際ワークショップ・イン・アジア，https://www.ieice-sisa.org/) Real-Time Virtual Workshop in Japanese Standard Time 2021年9月20日～22日
吉澤 真吾, 筒井 弘
電子情報通信学会 基礎・境界ソサイエティ Fundamentals Review, 15, 3, 243, 244, 一般社団法人 電子情報通信学会, 2022
Japanese - A Feasibility Study on CNN-LSTM Based Phrase Speech Recognition Compared with LSTM and HMM
Shingo Kato, Hiroshi Tsutsui
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 154, 157, Sep. 2021, [Peer-reviewed]
English, International conference proceedings - An Evaluation of 5G LDPC Decoder Using Min-Sum Irregular LDPC Decoder Design Framework Considering Its QC-LDPC Structure
Jimpu Suzuki, Hiroshi Tsutsui, Takeo Ohgane
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 71, 76, Sep. 2021, [Peer-reviewed]
English, International conference proceedings - An Approach to Maximize SDMA Uplink Communication in an IoT Media Access Control Protocol
Atsuki Kuriyama, Hiroshi Tsutsui
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 49, 52, Dec. 2020, [Peer-reviewed]
English, International conference proceedings - Wireless Channel Measurement System Using Zynq UltraScale+ RFSoC for MIMO and D2D Communication Systems
Haruki Inaba, Hiroshi Tsutsui, Takuya Yasugi
Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA), 135, 138, IEEE, Dec. 2020, [Peer-reviewed]
English, International conference proceedings - An Evaluation of High-Throughput Scalable Radix-4 FFT Processor Architecture Using Fixed-Point Arithmetic
Tomotaka Kawabata, Hiroshi Tsutsui
Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA), 114, 117, IEEE, Dec. 2020, [Peer-reviewed]
English, International conference proceedings - An Evaluation of Design Framework for Min-Sum Irregular LDPC Decoders
Jimpu Suzuki, Hiroshi Tsutsui, Takeo Ohgane
Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA), 110, 113, IEEE, Dec. 2020, [Peer-reviewed]
English, International conference proceedings - An Evaluation of a CNN-Based Parking Detection System with Webcams
Takuto Fukusaki, Hiroshi Tsutsui, Takeo Ohgane
Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA), 100, 103, IEEE, Dec. 2020, [Peer-reviewed]
English, International conference proceedings - WiFi Fingerprint Based Indoor Positioning Systems Using Estimated Reference Locations
Myat Hsu AUNG, Hiroshi TSUTSUI, Yoshikazu MIYANAGA
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E103.A, 12, 1483, 1493, Institute of Electronics, Information and Communications Engineers (IEICE), 01 Dec. 2020
Scientific journal - Robot Speech Recognition of Child Isolated Words
Yoshikazu Miyanaga, Yu Tian, Hiroshi Tsutsui
International STEM Education Conference (iSTEM-Ed 2020), Nov. 2020, [Peer-reviewed]
English, International conference proceedings - An Evaluation of Stack Light Indicator Color Detection System Using Web Cameras for Automatic Production Lines
Hiroshi Tsutsui, Kentaro Yamada, Akihiro Sudou, Yoshikazu Miyanaga
2019 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC), 1423, 1426, Nov. 2019, [Peer-reviewed]
International conference proceedings - Improvement on Children Speech Recognition under Low Signal-to-Noise Ratio Environment
Yu Tian, Jiayue Tang, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 4, 6, Aug. 2019, [Peer-reviewed]
English, International conference proceedings - Robust Isolated Speech Recognition for Keyword Detection System Using Hidden Markov Model
Jiayue Tang, Yu Tian, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 161, 163, Aug. 2019, [Peer-reviewed]
English, International conference proceedings - Voice Activity Detection Using Running Spectrum Analysis for Noise Robust Speech Recognition
Riku Takanashi, Tatsuya Nakagoshi, Noboru Hayasaka, Yoshikazu Miyanaga, Hiroshi Tsutsui
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 164, 166, Aug. 2019, [Peer-reviewed]
English, International conference proceedings - Construction and Management of Fingerprint Database with Estimated Reference Locations for WiFi Indoor Positioning Systems
Myat Hsu Aung, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of the 23rd Multi-conference on Systemics, Cybernetics and Informatics (WMSCI 2019), 2, 7, 10, Jul. 2019, [Peer-reviewed]
English, International conference proceedings - An Architecture for Real-Time Retinex-Based Image Enhancement and Haze Removal and Its FPGA Implementation
Dabwitso KASAUKA, Kenta SUGIYAMA, Hiroshi TSUTSUI, Hiroyuki OKUHATA, Yoshikazu MIYANAGA
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E102.A, 6, 775, 782, 01 Jun. 2019, [Peer-reviewed]
English, Scientific journal - Development of High Performance RF Modules Used in Real-time FHD Video Communication over 8x8 MIMO-OFDM System
Yoshikazu Miyanaga, Masaki Miura, Tohru Gotoh, Junji Yamano, Takashi Imagawa, Hiroshi Tsutsui
2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 107, 110, IEEE, Nov. 2018, [Peer-reviewed]
International conference proceedings - An Evaluation of Keyword Detection Using ACF of Pitch for Robust Speech Recognition
Jiayue Tang, Yu Tian, Xiaonan Jiang, Hiroshi Tsutsui, Yoshikazu Miyanaga
2018 18th International Symposium on Communications and Information Technologies (ISCIT), IEEE, Sep. 2018, [Peer-reviewed]
International conference proceedings - Keyword Detection Using F0-VAD in Robust Isolated Phase Recognition System
Jiayue Tang, Yu Tian, Xiaonan Jiang, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 121, 124, Aug. 2018, [Peer-reviewed]
English, International conference proceedings - Robust Children Isolated Speech Recognition System Using RSA and RSF
Yu Tian, Jiayue Tang, Xiaonan Jiang, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 113, 116, Aug. 2018, [Peer-reviewed]
English, International conference proceedings - An Evaluation of Entropy Coding Approaches in Block-Based Adaptive Lossless Image Coding Method for Embedded Systems
Yunako Katagishi, So Tsuyuguchi, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), Aug. 2018, [Peer-reviewed]
English, International conference proceedings - A Study of Pipelined Hardware Design of Matrix Inversion for Signal Separation in MIMO-OFDM Wireless Communication
Takashi Imagawa, Takahiro Ikeshita, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, Nov. 2017
Japanese - Robust Isolated Phrase Recognition System Using Running Spectrum Analysis
Xiaonan Jiang, Tatsuya Nakagoshi, George Mufungulwa, Hiroshi Tsutsui, Yoshikazu Miyanaga, Shini-ichi Abe
Proceedings of Intelligent Transportation Society of America World Congress (ITS 2017), Oct. 2017, [Peer-reviewed]
English, International conference proceedings - Robust speech recognition for similar Japanese pronunciation phrases under noisy conditions
George Mufungulwa, Hiroshi Tsutsui, Yoshikazu Miyanaga, Shin-Ichi Abe, Mitsuru Ochi
ISSCS 2017 - International Symposium on Signals, Circuits and Systems, Institute of Electrical and Electronics Engineers Inc., 12 Sep. 2017, [Peer-reviewed]
English, International conference proceedings - An Evaluation of Phrase Rejection Using K-means Clustering for Robust Speech Recognition
Xiaonan Jiang, Tatsuya Nakagoshi, Noboru Hayasaka, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 154, 157, Sep. 2017, [Peer-reviewed]
English, International conference proceedings - An Accuracy Evaluation of WiFi Based Indoor Positioning System Using Estimated Reference Locations
Myat Hsu Aung, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 321, 326, Sep. 2017, [Peer-reviewed]
English, International conference proceedings - An Evaluation of Foreground Extraction Using Background Subtraction and GrabCut
Kentaro Yamada, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 27, 30, Aug. 2017, [Peer-reviewed]
English, International conference proceedings - Low-Cost Adaptive Block-Based Lossless Compression Method for Memory Bandwidth Reduction
So Tsuyuguchi, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 97, 100, Aug. 2017, [Peer-reviewed]
English, International conference proceedings - Robust Speech Recognition Using Low-pass Processing RSA in the Frequency Domain
Tatsuya Nakagoshi, Xiaonan Jiang, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 139, 142, Aug. 2017, [Peer-reviewed]
English, International conference proceedings - An Implementation of WiFi Based Indoor Positioning System Using Estimated Reference Locations
Myat Hsu Aung, Hiroshi Tsutsui, Yoshikazu Miyanaga
GI-CoRE GSQ, GSB & IGM Joint Symposium, Jul. 2017
English - Enhanced Running Spectrum Analysis for Robust Speech Recognition Under Adverse Conditions: Case of Japanese Speech
George Mufungulwa, Hiroshi Tsutsui, Yoshikazu Miyanaga, Shini-ichi Abe
ECTI Transactions on Computer and Information Technology (ECTI-CIT), Jul. 2017, [Peer-reviewed]
English, Scientific journal - An Evaluation of Atmospheric Light Estimation in Haze Removal Method Using Variational Model Based Transmission Map Estimation
Kenta Sugiyama, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of Workshop on Circuits and Systems, 57, 60, May 2017
Japanese - Speech Recognition Using TVLPC Based MFCC for Similar Pronunciation Phrases
George Mufungulwa, Alia Asheralieva, Hiroshi Tsutsui, Shini-ichi Abe, Yoshikazu Miyanaga
Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), 1918, 1921, May 2017, [Peer-reviewed]
English, International conference proceedings - An FPU-based hardware implementation of Gauss-Jordan matrix inversion operation for MIMO-OFDM demodulation
Takahiro Ikeshita, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
Joint Conference of Electrical, Electronics and Information Engineers in Hokkaido, 174, 175, Nov. 2016
Japanese - An Evaluation of Haze Removal Method Using Variational Model Based Transmission Map Estimation
Kenta Sugiyama, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Society Conference, Sep. 2016
Japanese - Robust Speech Recognition using MFCC with Triangular Mel Filtered Time Varying LPC
George Mufungulwa, Hiroshi Tsutsui, Alia Asheralieva, Yoshikazu Miyanaga
IEICE Society Conference, Sep. 2016
English - An Accuracy Evaluation of Motion-Compensated Frame Interpolation Using High-Resolution Video and High-Frame-Rate Video
Hiroki Uesaka, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), Sep. 2016, [Peer-reviewed]
English, International conference proceedings - One-block shared memory FFT processor by using new memory addressing approach
Licheng Rao, Shingo Yoshizawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), Aug. 2016, [Peer-reviewed]
English, International conference proceedings - New MFCC with Triangular Mel Filtered Time Varying LPC
George Mufungulwa, Alia Asheralieva, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), Aug. 2016, [Peer-reviewed]
English, International conference proceedings - Speech Recognition using MFCC with Time Varying LPC for Similar Pronunciation Phrases
George Mufungulwa, Alia Asheralieva, Hiroshi Tsutsui, Yoshikazu Miyanaga
The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC), Jul. 2016, [Peer-reviewed]
English, International conference proceedings - Two-steps Process Speech Recognition System for Similar Pronunciation Phrases under Noise Environment
Na Zhu, Yoshikazu Miyanaga, Hiroshi Tsutsui, Masumi Watanabe
IEICE Technical Report, 116, 81, 61, 64, 電子情報通信学会, Jun. 2016
English - New Speech Features Based on time-varying LPC for Robust Automatic Speech Recognition
George Mufungulwa, Alia Asheralieva, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 116, 81, 55, 59, 電子情報通信学会, Jun. 2016
English - An Evaluation of Data Traffic Reduction for 3D Reconstruction Using a Wireless Network Camera System
Hikaru Aoki, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of IEICE Hokkaido Section Student Council Internet Symposium, Feb. 2016
Japanese - An Evaluation of Frame-based Parallel Processing for Iterative Shrinkage Smoothing Using Multi-core Processor
Seijiro Imai, Dabwitso Kasauka, Takashi Imagawa, Hiroshi Tsutsui, Hiroyuki Okuhata, Yoshikazu Miyanaga
Proceedings of IEICE Hokkaido Section Student Council Internet Symposium, Feb. 2016
Japanese - Image Smoothing in the Spatial Domain Using Multigrid Conjugate Gradient Methods Based on Accelerated Iterative Shrinkage
Dabwitso Kasauka, Hiroshi Tsutsui, Seijiro Imai, Takashi Imagawa, Hiroyuki Okuhata, Yoshikazu Miyanaga
2016 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA), 1, 5, 2016, [Peer-reviewed]
English, International conference proceedings - Processing Time Reduction of Tone Mapping Based on Iterative Shrinkage Smoothing Using Parallel Processing
Seijiro Imai, Dabwitso Kasauka, Hiroshi Tsutsui, Takashi Imagawa, Hiroyuki Okuhata, Yoshikazu Miyanaga
2016 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ISPACS), 211, 214, 2016, [Peer-reviewed]
English, International conference proceedings - An Evaluation of High Quality Synchronization Method Based on Delayed and Symmetric Correlation in MIMO-OFDM
Sukeyuki Iwata, Masahito Umehara, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 115, 348, 73, 76, Dec. 2015
Japanese - Processing Time Reduction of Iterative Shrinkage Smoothing Using Parallel Processing
Seijiro Imai, Dabwitso Kasauka, Takashi Imagawa, Hiroshi Tsutsui, Hiroyuki Okuhata, Yoshikazu Miyanaga
IEICE Technical Report, 115, 348, 57, 60, Dec. 2015
Japanese - Image Shrinking Based Computational Cost Reduction of Moving Area Extraction Using Global Motion Estimation with KLT Tracker and Background Subtraction
Shingo Kokami, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 115, 348, 95, 98, 電子情報通信学会, Dec. 2015
Japanese - An Evaluation for Appropriate Camera Selection in 3D Reconstruction System Using Multiple Cameras
Hikaru Aoki, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 115, 348, 53, 56, Dec. 2015
Japanese - An Accuracy Evaluation of Frame Interpolation Method Using High-Resolution Video and High-Frame Rate Video
Hiroki Uesaka, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 115, 348, 89, 94, Dec. 2015
Japanese - A Power Allocation Method in OFDMA System
Wenheng Zhang, Alia Asheralieva, Gengfa Fang, Hiroshi Tsutsui, Yoshikazu Miyanaga
Joint Conference of Electrical, Electronics and Information Engineers in Hokkaido, Nov. 2015
English - An evaluation of high quality synchronization method in MIMO-OFDM using measured value
Sukeyuki Iwata, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
Joint Conference of Electrical, Electronics and Information Engineers in Hokkaido, Nov. 2015
Japanese - Performance Evaluation of Carrier and Sampling Frequency Offset Compensation Using Measured Data in MIMO-OFDM Systems
Shinya Moriyama, Kosuke Morinaga, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga, Masaki Miura, Tohru Gotoh, Junji Yamano
IEICE Technical Report, 115, 208, 31, 36, Sep. 2015
Japanese - Image Shrinking Based Computational Cost Reduction of Moving Area Extraction with Global Motion Estimation and Background Subtraction
Shingo Kokami, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Society Conference, 143, Sep. 2015
Japanese - Computational Cost Reduction of Iterative Shrinkage Smoothing Based Image Enhancement
Seijiro Imai, Dabwitso Kasauka, Takashi Imagawa, Hiroshi Tsutsui, Hiroyuki Okuhata, Yoshikazu Miyanaga
IEICE Society Conference, 144, Sep. 2015
Japanese - An Evaluation of Motion Compensated Frame Interpolation from Multiple Resolution and Multiple Frame Rate Video Based on Global Motion
Hiroki Uesaka, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Society Conference, 145, Sep. 2015
Japanese - An Evaluation towards Highly Efficient 3D Reconstruction Using Multiple Cameras
Hikaru Aoki, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Society Conference, 147, Sep. 2015
Japanese - A Feasibility Study of a Flexible OFDM Transmitter Towards an Adaptive Control of Communication Quality
Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 77, 79, Sep. 2015, [Peer-reviewed]
English, International conference proceedings - Carrier and Sampling Frequency Offset Compensation in 8×8 MIMO-OFDM Systems and its Performance Evaluation Using Measured Data
Shinya Moriyama, Kosuke Morinaga, Takashi Imagawa, Hiroshi Tsutsui, Yoshikazu Miyanaga, Masaki Miura, Tohru Gotoh, Junji Yamano
Proceedings of International Symposium on Multimedia and Communication Technology (ISMAC), 73, 76, Sep. 2015, [Peer-reviewed]
English, International conference proceedings - 画像処理装置、画像処理方法及び画像処理用プログラム
Hiroshi Tsutsui, Hiroki Uesaka, Shingo Kokami
2015年8月21日 特願2015-163487, Aug. 2015
Japanese - Experimental Validation of Minimum Operating-voltage-estimation for Low Supply Voltage Circuits
Takashi Sato, Junya Kawashima, Hiroshi Tsutsui, Hiroyuki Ochi
PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL SYMPOSIUM ON QUALITY ELECTRONIC DESIGN (ISQED 2014), 428, +, 2015, [Peer-reviewed]
English, International conference proceedings - Image Smoothing Using Spatial Iterative Methods Based on Accelerated Iterative Shrinkage
Dabwitso Kasauka, Hiroshi Tsutsui, Hiroyuki Okuhata, Takashi Imagawa, Yoshikazu Miyanaga
2015 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA), 779, 783, 2015, [Peer-reviewed]
English, International conference proceedings - Incorporation of Time-Varying LP Cepstral Features in HMM-Based Isolated Word Speech Recognition
Federico Ang, Hiroshi Tsutsui, Yoshikazu Miyanaga
2015 INTERNATIONAL SYMPOSIUM ON SIGNALS, CIRCUITS AND SYSTEMS (ISSCS), 1, 4, 2015, [Peer-reviewed]
English, International conference proceedings - Time-Varying LP Cepstral Features for Improved Isolated Word Speech Recognition
Federico Ang, Hiroshi Tsutsui, Yoshikazu Miyanaga
2015 IEEE INTERNATIONAL CONFERENCE ON DIGITAL SIGNAL PROCESSING (DSP), 302, 306, 2015, [Peer-reviewed]
English, International conference proceedings - An FPGA Implementation of Low-latency Video Transmission System Using Lossless and Near-lossless Line-based Compression
Takahiro Inatsuki, Masato Matsuura, Kosuke Morinaga, Hiroshi Tsutsui, Yoshikazu Miyanaga
2015 IEEE INTERNATIONAL CONFERENCE ON DIGITAL SIGNAL PROCESSING (DSP), 1062, 1066, 2015, [Peer-reviewed]
English, International conference proceedings - An Approach of Doppler-Tolerant Channel Estimation Using RLS Algorithm for MIMO-OFDM Systems
Masahito Umehara, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 197, 202, Oct. 2014, [Peer-reviewed]
English, International conference proceedings - Doppler-Resistant Channel Estimation Method Using RLS Algorithm for MIMO-OFDM Systems
Masahito Umehara, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 114, 126(SIS), 135, 140, The Institute of Electronics, Information and Communication Engineers, Jul. 2014
Japanese, Frequency deviation by the Doppler shift in the multipath environment deteriorates the demodulation accuracy significantly. In this paper, we introduce the recursive least squares (RLS) algorithm which is one of the adaptive algorithms for MIMO detector of multiple-input multiple-output - orthogonal frequency division multiplexing (MIMO-OFDM) systems and propose a channel estimation method which has a Doppler resistance. In addition, we focus on the preamble structure of transmission frames to improve further demodulation accuracy. As a result, we report that the channel estimation accuracy is improved utilizing the extension high throughput - long training field (HT-LTF). - Effect of Receiver Diversity in IDMA Outdoor Transmission Experiment
Shingo Yoshizawa, Yasuyuki Hatakawa, Satoshi Konishi, Yuki Hikiyama, Hiroki Iwaizumi, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE General Conference, 441, Mar. 2014
Japanese - Characteristic Evaluation of IDMA in Outdoor Transmission Experiment
Yuki Hikiyama, Hiroki Iwaizumi, Shingo Yoshizawa, Yasuyuki Hatakawa, Satoshi Konishi, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE General Conference, 440, Mar. 2014
Japanese - Overview of Outdoor Transmission Experiment of IDMA
Yasuyuki Hatakawa, Satoshi Konishi, Shingo Yoshizawa, Hiroki Iwaizumi, Yuki Hikiyama, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE General Conference, 439, Mar. 2014
Japanese - Computational Cost Analysis and Implementation of Accelerated Iterative Shrinkage Smoothing
Dabwitso Kasauka, Hiroshi Tsutsui, Hiroyuki Okuhata, Yoshikazu Miyanaga
2014 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA), 1, 4, 2014, [Peer-reviewed]
English, International conference proceedings - VIDEO WIRELESS COMMUNICATION BASED ON HIGH SPEED 8 x 8 MIMO-OFDM SYSTEM
Hiroki Lwaiztani, Masahiro Sugnani, Baiko Sai, Hiroshi Tsutsui, Voshikazu Miyanaga
2014 6TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS, CONTROL AND SIGNAL PROCESSING (ISCCSP), 586, 589, 2014, [Peer-reviewed]
English, International conference proceedings - Development of 8x8 MIMO-OFDM System Using 9-Step MIMO Detector
Masahiro Sugitani, Hiroki Iwaizumi, Baiko Sai, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 113, 343, 41, 46, The Institute of Electronics, Information and Communication Engineers, Dec. 2013
Japanese, An 8×8 MIMO-OFDM system is designed to achieve a large capacity and high-speed communication system. However, it is needed to reduce circuit scale and power consumption since the receiver needs huge calculation cost in interference cancellation. In this paper, we introduce Strassen's algorithm in a part of MIMO detection inverse matrix calculation process to reduce the calculation cost. Also, we designed an 9-step MIMO detector which reduces circuit scale by dividing all calculation into 9 steps in MMSE weight matrix calculator. We propose a low-power 8×8 MIMO-OFDM wireless communication system with performance evaluation results. - Design of Highly Accurate 8x8 MIMO-OFDM System Using ASIP
Hiroki Iwaizumi, Masahiro Sugitani, Baiko Sai, Hiroshi Tsutsui, Yoshikazu Miyanaga
IEICE Technical Report, 113, 343, 35, 40, The Institute of Electronics, Information and Communication Engineers, Dec. 2013
Japanese, In this paper, we propose a hardware design of highly accurate 8×8 multiple-input multiple-output - or -thogonal frequency division multiplexing (MIMO-OFDM) system which has floating-point processors in its receiver. For hardware design of MIMO-OFDM systems, it is efficient to use fixed-point processing in terms of processing speed and power consumption. However, in poor environments, floating-point processing is necessary since highly accurate processing is required for MIMO decoding. In this research, we have realized high accuracy and realtime processing of MIMO decoding by employing application specific instruction-set processor (ASIP) and making algorithm more efficient. - Study of PAPR reduction using coded PTS in 8x8 MIMO-OFDM systems
Yuya Inoue, Hiroshi Tsutsui, Yoshikazu Miyanaga
ISPACS 2013 - 2013 International Symposium on Intelligent Signal Processing and Communication Systems, 363, 368, Nov. 2013, [Peer-reviewed]
English, International conference proceedings - Place-and-Route Algorithms for a Reliability-Oriented Coarse-Grained Reconfigurable Architecture Using Time Redundancy
Takashi Imagawa, Masayuki Hiromoto, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proc. of the 18th Workshop on Synthesis And System Integration of Mixed Information technologies (SASIMI2013), 76, 81, Oct. 2013, [Peer-reviewed]
English, International conference proceedings - An Evaluation of Channel Estimation Using RLS Algorithm in MIMO-OFDM Systems
Masahito Umehara, Baiko Sai, Hiroshi Tsutsui, Yoshikazu Miyanaga
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), 145, 150, Oct. 2013, [Peer-reviewed]
English, International conference proceedings - An evaluation of wireless video transmission using lossless video compression and 8×8 MIMO-OFDM wireless transceiver
Kosuke Morinaga, Hiroshi Tsutsui, Yoshikazu Miyanaga
13th International Symposium on Communications and Information Technologies: Communication and Information Technology for New Life Style Beyond the Cloud, ISCIT 2013, 685, 690, Sep. 2013, [Peer-reviewed]
English, International conference proceedings - MIMO propagation scenario discrimination for adaptive wireless communication systems
Yuki Hikiyama, Hiroshi Tsutsui, Yoshikazu Miyanaga
13th International Symposium on Communications and Information Technologies: Communication and Information Technology for New Life Style Beyond the Cloud, ISCIT 2013, 674, 679, Sep. 2013, [Peer-reviewed]
English, International conference proceedings - Robust speech recognition for similar pronunciation phrases using MMSE under noise environments
Masumi Watanabe, Hiroshi Tsutsui, Yoshikazu Miyanaga
13th International Symposium on Communications and Information Technologies: Communication and Information Technology for New Life Style Beyond the Cloud, ISCIT 2013, 802, 807, Sep. 2013, [Peer-reviewed]
English, International conference proceedings - Realtime transmission of full high-definition 30 frames/s videos over 8×8 MIMO-OFDM channels using HACP-based lossless coding
Masato Matsuura, Hiroshi Tsutsui, Yoshikazu Miyanaga
13th International Symposium on Communications and Information Technologies: Communication and Information Technology for New Life Style Beyond the Cloud, ISCIT 2013, 797, 801, Sep. 2013, [Peer-reviewed]
English, International conference proceedings - Failure mode analysis for flip-flops at low voltages
Takafumi Fujita, Junya Kawashima, Masayuki Hiromoto, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE Technical Report, 113, 112, 129, 134, 電子情報通信学会, Jul. 2013
Japanese - A Random Walk Based Power Supply Network Analysis Utilizing Quasi Zero Variance Importance Sampling and Error Smoothing
Tsuyoshi Okazaki, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
in Proc. of Workshop on Circuits and Systems, 26, 472, 477, [電子情報通信学会], Jul. 2013, [Peer-reviewed]
Japanese, International conference proceedings - Complexity Based Adaptive Sampling for Compressive Sensing Image Sensors
Takafumi Fujita, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
in Proc. of Workshop on Circuits and Systems, 26, 397, 402, [電子情報通信学会], Jul. 2013, [Peer-reviewed]
Japanese, International conference proceedings - A correlational study between most probable failure point and yield in SRAM circuit analysis
Kazunori Kimura, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
in Proc. of Workshop on Circuits and Systems, 26, 374, 379, [電子情報通信学会], Jul. 2013, [Peer-reviewed]
Japanese, International conference proceedings - [Tutorial Lecture] Design Case Study of Image Processing Hardware IP -- Development of Retinex-based Image Enhancement IP Core --
Hiroshi Tsutsui
IEICE Technical Report, 113, 78, 47, 52, The Institute of Electronics, Information and Communication Engineers, Jun. 2013
Japanese, In recent years, the demand for image processing has been growing steadily with the wide use of digital imaging devices such as smart phones and camcorders. In the case of image processing for video data, since the amount of data per unit time is relatively large, it is implemented in hardware instead of software especially when real-time processing is required. This paper provides an overview of image processing IP core design using a development case of Retinex-based adaptive image enhancement IP core. - Histogram Propagation Based Statistical Timing Analysis Using Dependent Node Selection
Shiyi Zhang, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC), 321, 324, Jun. 2013, [Peer-reviewed]
English, International conference proceedings - Architecture for Sealed Wafer-scale Mask ROM for Long-term Digital Data Preservation
Shinya Matsuda, Takashi Imagawa, Hiroshi Tsutsui, Takashi Sato, Yukihiro Nakamura, Hiroyuki Ochi
The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC), 274, 277, Jun. 2013, [Peer-reviewed]
English, International conference proceedings - Fast and memory-efficient GPU implementations of Krylov subspace methods for efficient power grid analysis
Takumi Morishita, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proceedings of the ACM Great Lakes Symposium on VLSI, GLSVLSI, 95, 100, May 2013, [Peer-reviewed]
English, International conference proceedings - A Cost-Effective Selective TMR for Coarse-Grained Reconfigurable Architectures Based on DFG-Level Vulnerability Analysis
Takashi Imagawa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE TRANSACTIONS ON ELECTRONICS, E96C, 4, 454, 462, Apr. 2013, [Peer-reviewed]
English, Scientific journal - Parallel Acceleration Scheme for Monte Carlo Based SSTA Using Generalized STA Processing Element
Hiroshi Yuasa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE TRANSACTIONS ON ELECTRONICS, E96C, 4, 473, 481, Apr. 2013, [Peer-reviewed]
English, Scientific journal - Comparison of energy consumption of latches of different topologies
Takafumi Fujita, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE General Conference, 2013, 78, Mar. 2013
Japanese - Evaluation of Dependent Node Selection of Histogram Propagation Based Statistical Timing Analysis
Shiyi Zhang, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proceedings of the 2013 IEICE general conference, Fundamentals on Electronics, Communications and Computer Sciences, 62, Mar. 2013
English - Consistency enforcement of node voltages for thread parallel implementation of random-walk-based linear circuit analysis
Tsuyoshi Okazaki, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE General Conference, 2013, 61, Mar. 2013
Japanese - Multi-trap RTN Parameter Extraction based on Bayesian Inference
Hiromitsu Awano, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL SYMPOSIUM ON QUALITY ELECTRONIC DESIGN (ISQED 2013), 597, 602, Mar. 2013, [Peer-reviewed]
English, International conference proceedings - High-speed DFG-level SEU Vulnerability Analysis for Applying Selective TMR to Resource-Constrained CGRA
Takashi Imagawa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL SYMPOSIUM ON QUALITY ELECTRONIC DESIGN (ISQED 2013), 538, 545, 2013, [Peer-reviewed]
English, International conference proceedings - A Cost-Effective Selective TMR for Heterogeneous Coarse-Grained Reconfigurable Architectures based on DFG-Level Vulnerability Analysis
Takashi Imagawa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
DESIGN, AUTOMATION & TEST IN EUROPE, 701, 706, 2013, [Peer-reviewed]
English, International conference proceedings - Hot-Swapping Architecture with Back-biased Testing for Mitigation of Permanent Faults in Functional Unit Array
Zoltan Endre Rakossy, Masayuki Hiromoto, Hiroshi Tsutsui, Takashi Sato, Yukihiro Nakamura, Hiroyuki Ochi
DESIGN, AUTOMATION & TEST IN EUROPE, 535, 540, 2013, [Peer-reviewed]
English, International conference proceedings - Realization of frequency-domain circuit analysis through random walk
Tetsuro Miyakawa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC, 169, 174, Jan. 2013, [Peer-reviewed]
English, International conference proceedings - Bayesian Estimation of Multi-Trap RTN Parameters Using Markov Chain Monte Carlo Method
Hiromitsu Awano, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E95A, 12, 2272, 2283, Dec. 2012, [Peer-reviewed]
English, Scientific journal - A Variability-Aware Energy-Minimization Strategy for Subthreshold Circuits
Junya Kawashima, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E95A, 12, 2242, 2250, Dec. 2012, [Peer-reviewed]
English, Scientific journal - Accurate I/O Buffer Impedance Self-Adjustment using Vth and Temperature Sensors
Zhi Li, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE Technical Report, 112, 320, 117, 122, The Institute of Electronics, Information and Communication Engineers, Nov. 2012
English, With the increased operating frequency and the reduction of feature size, achieving low error-rate data transmission between LSIs is an important field of research. In particular, input/output (I/O) impedance matching, as one of the necessary technologies for high-speed transmission, is strongly required. In this paper, we propose an architecture of output buffer whose impedance is self-adjustable against process variation and temperature characteristic of MOS transistors. The proposed architecture utilizes on-chip sensor circuits to capture threshold voltages and temperatures. Based on a commercial 65 nm CMOS technology. The proposed method has been verified. Without the use of reference resistor, it successfully adjusts the I/O impedance within 2.36% and 1.4% around a target of 50Ω through simulation and measurement, respectively, regardless of the process parameters and temperature. - Estimation of Model Parameters for Random Telegraph Noise Based on Information Criterion
Hirofumi Shimizu, Hiromitsu Awano, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
in Proc. of IPSJ DA Symposium, 2012, 5, 49, 54, Aug. 2012, [Peer-reviewed]
Japanese, International conference proceedings - Fast GPU Implementations of Krylov Subspace Methods for Power Grid Analysis
Takumi Morishita, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
in Proc. of Workshop on Circuits and Systems, 25, 432, 437, [電子情報通信学会], Jul. 2012, [Peer-reviewed]
Japanese, International conference proceedings - A Study for Improving Minimum Operation Voltage and Its Estimation Accuracy
Junya Kawashima, Hiroyuki Ochi, Hiroshi Tsutsui, Takashi Sato
in Proc. of Workshop on Circuits and Systems, 313, 318, Jul. 2012, [Peer-reviewed]
Japanese, International conference proceedings - An Approach for Deinterlacing using Cost Optimaization and Motion Detection History
Tatsuo Maeno, Hiroshi Tsutsui, Takao Onoye
IEICE Technical Report, 112, 78, 77, 82, Jun. 2012
Japanese - GPU Acceleration of Cycle-based Soft-Error Simulation for Reconfigurable Array Architectures
Takashi Imagawa, Takahiro Oue, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proc. of the 17th Workshop on Synthesis And System Integration of Mixed Information technologies (SASIMI2012), 88, 93, Mar. 2012, [Peer-reviewed]
English, International conference proceedings - Hardware Architecture for Accelerating Monte Carlo based SSTA using Generalized STA Processing Element
Hiroshi Yuasa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proc. of the 17th Workshop on Synthesis And System Integration of Mixed Information technologies (SASIMI2012), 205, 210, Mar. 2012, [Peer-reviewed]
English, International conference proceedings - Acceleration Scheme for Monte Carlo based SSTA using Generalized STA Processing Element
Hiroshi Yuasa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proc. of ACM/IEEE International Workshop on Timing Issues (TAU), Jan. 2012, [Peer-reviewed]
English, International conference proceedings - A High-Throughput Pipelined Parallel Architecture for JPEG XR Encoding
Hiroshi Tsutsui, Koichi Hattori, Hiroyuki Ochi, Yukihiro Nakamura
ACM TRANSACTIONS ON EMBEDDED COMPUTING SYSTEMS, 11, 4, 1, 25, 2012, [Peer-reviewed]
English, Scientific journal - Halo Artifacts Reduction Method for Variational based Realtime Retinex Image Enhancement
Hiroshi Tsutsui, Satoshi Yoshikawa, Hiroyuki Okuhata, Takao Onoye
2012 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC), 2012, [Peer-reviewed]
English, International conference proceedings - Statistical Observations of NBTI-induced Threshold Voltage Shifts on Small Channel-area Devices
Takashi Sato, Hiromitsu Awano, Hirofumi Shimizu, Hiroshi Tsutsui, Hiroyuki Ochi
2012 13TH INTERNATIONAL SYMPOSIUM ON QUALITY ELECTRONIC DESIGN (ISQED), 306, 311, 2012, [Peer-reviewed]
English, International conference proceedings - An Acceleration Method for Power Grid Analysis using Block-Iterative Algorithm
Takumi Morishita, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE Technical Report, 111, 324, 67, 71, Nov. 2011
Japanese - A study on parameter estimation for modeling of random-telegraph noise
Hiromitsu Awano, Hirofumi Shimizu, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE Technical Report, 111, 324, 85, 90, Nov. 2011
Japanese - Random-walk based transient analysis for linear circuits using quasi-zero-variance importance sampling
Tetsuro Miyakawa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE Technical Report, 111, 324, 73, 78, Nov. 2011
Japanese - An automated estimation of MOS transistors' interface-state numbers using EM algorithm
Hirofumi Shimizu, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE Society Conference, 2011, 93, Sep. 2011
Japanese - A sensor-based self-adjustment approach for controlling I/O buffer impedance
Zhi Li, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proc. of IEICE Society Conference, 120, 120, 120, The Institute of Electronics, Information and Communication Engineers, Sep. 2011
English - A GPU Implementation of Jacobi Method for Power Grid Analysis
Takumi Morishita, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
IEICE Society Conference, 2011, 84, Sep. 2011
Japanese - A device array for efficient bias-temperature instability measurements
Takashi Sato, Tadamichi Kozaki, Takumi Uezono, Hiroshi Tsutsui, Hiroyuki Ochi
European Solid-State Device Research Conference, 143, 146, Sep. 2011, [Peer-reviewed]
English, International conference proceedings - Sequential Importance Sampling for Yield Estimation of Circuits with Multiple Failure Regions
Kentaro Katayama, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
in Proc. of IPSJ DA Symposium, 2011, 5, 93, 98, Aug. 2011, [Peer-reviewed]
Japanese, International conference proceedings - An Optimization Method of Selective TMR for Coarse- Grained Reconfigurable Architecutres using Reliability Model of Routing Resources
Takashi Imagawa, Hiroshi Yuasa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
in Proc. of IPSJ DA Symposium, 2011, 5, 111, 116, Aug. 2011, [Peer-reviewed]
Japanese, International conference proceedings - Quality evaluation of an inpainting-based deinterlacing scheme
Tatsuo Maeno, Hiroshi Tsutsui, Takao Onoye
IEICE Technical Report, 111, 78, 99, 104, Jun. 2011
Japanese - An approach to halo suppression for Retinex-based image enhancement
Satoshi Yoshikawa, Hiroshi Tsutsui, Hiroyuki Okuhata, Takao Onoye
IEICE Technical Report, 111, 78, 93, 98, The Institute of Electronics, Information and Communication Engineers, Jun. 2011
Japanese, In Retinex-based image enhancement schemes, an image is enhanced by removing an estimated illumination included in the input image. As for illumination estimation method, in this paper, we focus on the variational model which utilizes spatially smooth property of the illumination and formulates the illumination estimation problem as a quadratic programming optimization problem. In this method, the ordinary halo effect, which over-enhances bright regions adjacent with dark regions, does not occur. However, dark regions adjacent with bright regions remain as it was since they cannot be sufficiently enhanced. This effect is called a reverse halo effect in this paper. To suppress this effect, we propose a method to control the parameter in the cost function based on each pixel value and the amount of edge component. The experimental results show that the proposed method can suppress the reverse halo effect maintaining other features of the Retinex-based image enhancement. - A stress-parallelized device array for efficient bias-temperature stability measurement
Takashi Sato, Tadamichi Kozaki, Takumi Uezono, Hiroshi Tsutsui, Hiroyuki Ochi
Proc. of IEEE International Workshop on Design for Manufacturability and Yield 2011 (DFM&Y), 19, 22, Jun. 2011, [Peer-reviewed]
English, International conference proceedings - Acceleration of random-walk-based linear circuit analysis using importance sampling
Tetsuro Miyakawa, Koh Yamanaga, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
Proceedings of the ACM Great Lakes Symposium on VLSI, GLSVLSI, 211, 216, May 2011, [Peer-reviewed]
English, International conference proceedings - Hardware Implementation of Real-time Motion Adaptive Deinterlacing based on Inpainting
Tatsuo Maeno, Hiroshi Tsutsui, Takao Onoye
Proceedings of International Conference on Embedded Systems and Intelligent Technology (ICESIT), Feb. 2011, [Peer-reviewed]
English, International conference proceedings - A Design Strategy for Sub-Threshold Circuits Considering Energy-Minimization and Yield-Maximization
Junya Kawashima, Hiroyuki Ochi, Hiroshi Tsutsui, Takashi Sato
2011 IEEE INTERNATIONAL SOC CONFERENCE (SOCC), 57, 62, 2011, [Peer-reviewed]
English, International conference proceedings - A Design Strategy for Sub-Threshold Circuits Considering Energy-Minimization and Yield-Maximization
Junya Kawashima, Hiroyuki Ochi, Hiroshi Tsutsui, Takashi Sato
2011 IEEE INTERNATIONAL SOC CONFERENCE (SOCC), 57, 62, 2011, [Peer-reviewed]
English, International conference proceedings - A fully pipelined implementation of Monte Carlo based SSTA on FPGAs
Hiroshi Yuasa, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
2011 12TH INTERNATIONAL SYMPOSIUM ON QUALITY ELECTRONIC DESIGN (ISQED), 785, 790, 2011, [Peer-reviewed]
English, International conference proceedings - Sequential Importance Sampling for Low-Probability and High-Dimensional SRAM Yield Analysis
Kentaro Katayama, Shiho Hagiwara, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato
2010 IEEE AND ACM INTERNATIONAL CONFERENCE ON COMPUTER-AIDED DESIGN (ICCAD), 703, 708, Nov. 2010, [Peer-reviewed]
English, International conference proceedings - An Approach to Motion-Compensated Frame Interpolation based on Feature Tracking
Hideyuki Nakamura, Hiroshi Tsutsui, Takao Onoye
Proceedings of International Workshop on Smart Info-Media Systems in Asia (SISA), Sep. 2010, [Peer-reviewed]
English, International conference proceedings - An FPGA Implementation of Real-Time Retinex Video Image Enhancement
Hiroshi Tsutsui, Hideyuki Nakamura, Ryoji Hashimoto, Hiroyuki Okuhata, Takao Onoye
Proc. of World Automation Congress (WAC), International Forum on Multimedia and Image Processing (IFMIP), Sep. 2010, [Peer-reviewed]
English, International conference proceedings - Noise Analysis of Video Sequences Acquired by Consumer Camcorders
Satoshi Yoshikawa, Hiroshi Tsutsui, Takao Onoye
IEICE Technical Report, 110, 74, 93, 98, Jun. 2010
Japanese - Hardware Implementation of Real-time Deinterlacing based on Inpainting
Tatsuo Maeno, Hiroshi Tsutsui, Takao Onoye
IEICE Technical Report, 110, 74, 87, 92, Jun. 2010
Japanese - Media Streaming System with Dynamic Rate Control for High Speed Mobile Networks
Masayuki Hiromoto, Hiroshi Tsutsui, Hiroyuki Ochi, Tomoyuki Osano, Norihiro Ishikawa, Yukihiro Nakamura
IPSJ Journal, 50, 10, 2532, 2542, Oct. 2009, [Peer-reviewed]
Japanese, Scientific journal - Motion-Compensated Frame Interpolation based on Feature Tracking
Hideyuki Nakamura, Hiroshi Tsutsui, Ryoji Hashimoto, Takao Onoye
IEICE Society Conference, 2009, 204, 204, The Institute of Electronics, Information and Communication Engineers, Sep. 2009
Japanese - Efficient Memory Organization Framework for JPEG2000 Entropy Codec
Hiroki Sugano, Takahiko Masuzaki, Hiroshi Tsutsui, Takao Onoye, Hiroyuki Ochi, Yukihiro Nakamura
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E92A, 8, 1970, 1977, Aug. 2009, [Peer-reviewed]
English, Scientific journal - A JPEG2000 Codec System Architecture for Single Tile Processing
Takahiko Masuzaki, Hiroshi Tsutsui, Takao Onoye, Yusuke Mizuno, Gen Sasaki, Yukihiro Nakamura
Journal of the Institute of Image Electronics Engineers of Japan, 38, 3, 296, 304, May 2009, [Peer-reviewed]
English, Scientific journal - Dynamic rate control for media streaming in high-speed mobile networks
Masayuki Hiromoto, Hiroshi Tsutsui, Hiroyuki Ochi, Tomoyuki Osano, Norihiro Ishikawa, Yukihiro Nakamura
IEEE Wireless Communications and Networking Conference, WCNC, Apr. 2009, [Peer-reviewed]
English, International conference proceedings - Likelihood Estimation for Transform Domain Distributed Video Coding
Ryoji Hashimoto, Hiroshi Tsutsui, Takao Onoye, Tomohiro Ikai
IEICE Technical Report, 108, 425, 31, 36, The Institute of Image Information and Television Engineers, Feb. 2009
Japanese, Distributed Video Coding (DVC), which is a new image compression paradigm, attracts a lot of attention from video researchers. While computational cost of DVC encoding is lower than that of MPEG-2, low coding efficiency has been an issue for practical DVC applications. In this paper, a likelihood estimation method for transform domain DVC is proposed, which uses Cauchy distribution as a virtual channel model. In the decoder, virtual channel is estimated by utilizing error between forward and backward predicted images for each frequency component. Likelihood is obtained from estimated virtual channel. Simulation results show that the proposed method can estimate the error rate with 1.6% error on average. - A High-Throughput Pipelined Architecture for JPEG XR Encoding
Koichi Hattori, Hiroshi Tsutsui, Hiroyuki Ochi, Yukihiro Nakamura
2009 IEEE/ACM/IFIP 7TH WORKSHOP ON EMBEDDED SYSTEMS FOR REAL-TIME MULTIMEDIA, 9, +, 2009, [Peer-reviewed]
English, International conference proceedings - Dynamic Rate Control for Media Streaming in High-speed Mobile Network
Masayuki Hiromoto, Hiroshi Tsutsui, Hiroyuki Ochi, Tomoyuki Osano, Norihiro Ishikawa, Yukihiro Nakamura
in Proc. of Multimedia, Distributed, Cooperative and Mobile Symposium 2008, 1167, 1176, Jul. 2008, [Peer-reviewed]
Japanese, International conference proceedings - An Architecture of Photo Core Transform in HD Photo Coding System for Embedded System of Various Bandwidths
Koichi Hattori, Hiroshi Tsutsui, Hiroyuki Ochi, Yukihiro Nakamura
IEICE Technical Report, 108, 85, 39, 44, Jun. 2008
Japanese - An Architecture of Photo Core Transform in HD Photo Coding System for Embedded Systems of Various Bandwidths
Koichi Hattori, Hiroshi Tsutsui, Hiroyuki Ochi, Yukihiro Nakamura
2008 IEEE ASIA PACIFIC CONFERENCE ON CIRCUITS AND SYSTEMS (APCCAS 2008), VOLS 1-4, 1592, +, 2008, [Peer-reviewed]
English, International conference proceedings - Video Coding Scheme for Video Sequences Degraded by Noise of Old Motion Picture Films
Hiroshi Tsutsui
IEICE Society Conference, 2007, SS.8, SS.9, Sep. 2007
Japanese - A Multi-Symbol Arithmetic Decoder for JPEG2000
Hiroshi Tsutsui, Norimasa Fujita, Takao Onoye, Yukihiro Nakamura
IEICE Technical Report, 107, 93, 13, 18, The Institute of Electronics, Information and Communication Engineers, Jun. 2007
Japanese, In this paper, we propose a novel multi-symbol arithmetic decoder for JPEG2000, which is the most cost-intensive part in JPEG2000 decoding. The experimental result shows that by using the proposed arithmetic decoders which decode two and three symbols per cycle, the time required by arithmetic decoding with a single-symbol decoder can be reduced to 83% and 78% respectively. - Highly Accurate Stereo Matching Processor based on Variable Window Approach
Ryusuke Miyamoto, Jaehoon Yu, Hiroshi Tsutsui, Yukihiro Nakamura
Journal of the Institute of Image Electronics Engineers of Japan, 36, 3, 210, 218, May 2007, [Peer-reviewed]
English, Scientific journal - Stochastic pedestrian tracking based on 6-stick skeleton model
Ryusuke Miyamoto, Jumpei Ashida, Hiroshi Tsutsui, Yukihiro Nakamura
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E90A, 3, 606, 617, Mar. 2007, [Peer-reviewed]
English, Scientific journal - Home appliance control from mobile phones
Hiromitsu Sumino, Yoshitaka Uchida, Norihiro Ishikawa, Hiroshi Tsutsui, Hiroyuki Ochi, Yukihiro Nakamura
2007 4TH IEEE CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE, VOLS 1-3, 793, +, 2007, [Peer-reviewed]
English, International conference proceedings - Implementation of AV streaming system using peer-to-peer communication
Hiroshi Tsutsui, Jaehoon Yu, Tomonori Izumi, Hiroyuki Ochi, Yukihiro Nakamura, Takaaki Komura, Yoshitaka Uchida, Norihiro Ishikawa
2007 4TH IEEE CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE, VOLS 1-3, 778, +, 2007, [Peer-reviewed]
English, International conference proceedings - Boosting based Pedestrian Detection in Far Infrared Images
Ryusuke Miyamoto, Hiroki Sugano, Hiroaki Saito, Hiroshi Tsutsui, Hiroyuki Ochi, Ken'ichi Hatanaka, Yukihiro Nakamura
IEICE Society Conference, 2006, 178, Sep. 2006
Japanese - A Retargetable Compiler for Cell-Array Based Self-Reconfigurable Architecture
Masayuki Hiromoto, Sinichi Koyama, Kentaro Nakahara, Hiroshi Tsutsui, Hiroyuki Ochi, Yukihiro Nakamura
in Proc. of IPSJ DA Symposium, 181, 186, Jul. 2006, [Peer-reviewed]
Japanese, International conference proceedings - A JPEG Coding Scheme for High Fidelity Images by Halftoning Less Significant Extra Bits
Fumihiko Hyuga, Takahiko Masuzaki, Hiroshi Tsutsui, Takao Onoye, Yukihiro Nakamura
Proc. of International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC2006), 3, 97, 100, Jul. 2006, [Peer-reviewed]
English, International conference proceedings - A JPEG Coding Scheme for High Fidelity Images by Halftoning Less Significant Extra Bits and an Examination of Optimizing the Halftone
Fumihiko Hyuga, Takahiko Masuzaki, Hiroshi Tsutsui, Takao Onoye, Yukihiro Nakamura
IEICE Technical Report, 106, 96, 31, 36, The Institute of Electronics, Information and Communication Engineers, Jun. 2006
Japanese, In this paper, a novel JPEG coding scheme for high fidelity images is proposed. When high fidelity images are compressed with JPEG, the information which cannot be represented by JPEG-compliant 8-bit data must be truncated. This truncation causes the quality degradation, In order to suppress this quality degradation, in the proposed scheme, halftoning is used to represent pixels of a high fidelity image with JPEG-compliant 8-bit data. The effect of halftoning depends on the characteristics of image. So halftoning and rounding is applied for each of 8×8 size block to truncate the extra information, then the method which is applied for each block is decided by the quality criteria. Moreover, optimization of halftoning parameters using simulated annealing is demonstrated. - Stochastic Pedestrian Tracking based on Skeleton Model with Likelihood Estimation using Distance Transformed Images
Ryusuke Miyamoto, Jumpei Ashida, Hiroshi Tsutsui, Yukihiro Nakamura
IEICE Technical Report, 106, 96, 25, 30, The Institute of Electronics, Information and Communication Engineers, Jun. 2006
Japanese, A novel pedestrian tracking scheme based on a particle filter is proposed, which uses a skeleton model of a pedestrian and distance transformed images for likelihood estimation. The six-stick skeleton model used in the proposed approach is very distinctive in representing a pedestrian simply but effectively, with which the efficient state space for the pedestrian tracking can be derived. Experimental results by using PETS sample sequences demonstrate that the proposed approach achieves high-accurate pedestrian tracking without any of prior learning. - A Retargetable Compiler for Cell-Array Based Self-Reconfigurable Architecture
Masayuki Hiromoto, Sinichi Koyama, Kentaro Nakahara, Hiroshi Tsutsui, Hiroyuki Ochi, Yukihiro Nakamura
IEICE Technical Report, 106, 49, 7, 12, May 2006
Japanese - 多重画像の統合による動きブレを伴わないカラーダイナミックレンジの拡張
Ryusuke Miyamoto, Yuuki Hara, Hiroshi Tsutsui, Yukihiro Nakamura
in Proc. of Workshop on Circuits and Systems in Karuizawa, 19, 189, 192, [電子情報通信学会], Apr. 2006, [Peer-reviewed]
Japanese, International conference proceedings - 可変ウィンドウステレオマッチングプロセッサのアーキテクチャ
Ryusuke Miyamoto, Jaehoon Yu, Hiroshi Tsutsui, Yukihiro Nakamura
in Proc. of Workshop on Circuits and Systems in Karuizawa, 165, 170, Apr. 2006, [Peer-reviewed]
Japanese, International conference proceedings - Efficient memory architecture for JPEG2000 entropy codec
Hiroki Sugano, Hiroshi Tsutsui, Takahiko Masuzaki, Takao Onoye, Hiroyuki Ochi, Yukihiro Nakamura
Proceedings - IEEE International Symposium on Circuits and Systems, 2881, 2884, 2006
English, International conference proceedings - Design framework for JPEG2000 system architecture
Hiroshi Tsutsui, Takahiko Masuzaki, Yoshiteru Hayashi, Yoshitaka Taki, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
INTELLIGENT AUTOMATION AND SOFT COMPUTING, 12, 3, 331, 343, 2006, [Peer-reviewed]
English, Scientific journal - Efficient memory architecture for JPEG2000 entropy codec
Hiroki Sugano, Hiroshi Tsutsui, Takahiko Masuzaki, Takao Onoye, Hiroyuki Ochi, Yukihiro Nakamura
2006 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-11, PROCEEDINGS, 2881, 2884, 2006, [Peer-reviewed]
English, International conference proceedings - Pedestrian recognition in far-infrared images by combining boosting-based detection and skeleton-based stochastic tracking
Ryusuke Miyamoto, Hiroki Sugano, Hiroaki Saito, Hiroshi Tsutsui, Hiroyuki Ochi, Ken'ichi Hatanaka, Yukihiro Nakamura
ADVANCES IN IMAGE AND VIDEO TECHNOLOGY, PROCEEDINGS, 4319, 483, +, 2006, [Peer-reviewed]
English, International conference proceedings - Skeleton based stochastic pedestrian tracking for surveillance
Ryusuke Miyamoto, Jumpei Ashida, Hiroshi Tsutsui, Yukihiro Nakamura
WMSCI 2006: 10TH WORLD MULTI-CONFERENCE ON SYSTEMICS, CYBERNETICS AND INFORMATICS, VOL V, PROCEEDINGS, V, 206, +, 2006, [Peer-reviewed]
English, International conference proceedings - Probabilistic pedestrian tracking based on a skeleton model
Jumpei Ashida, Ryusuke Miyamoto, Hiroshi Tsutsui, Takao Onoye, Yukihiro Nakamura
2006 IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, ICIP 2006, PROCEEDINGS, 2825, +, 2006, [Peer-reviewed]
English, International conference proceedings - High-Quality Motion JPEG2000 Rate Control Scheme Based on Scene Changes
Ryusuke Miyamoto, Hiroshi Tsutsui, Hiroaki Sugita, Takahiko Masuzaki, Hiroyuki Ochi, Takao Onoye, Yukihiro Nakamura
IEICE Society Conference, 2005, 164, Sep. 2005
Japanese - Efficient SRAM Architecture for JPEG2000 Entropy Coder
Hiroshi Tsutsui, Hiroki Sugano, Takahiko Masuzaki, Hiroyuki Ochi, Takao Onoye, Yukihiro Nakamura
IEICE Society Conference, 2005, 22, Sep. 2005
Japanese - JPEG2000 符復号器のためのスケーラブルデザインフレームワーク
Hiroshi Tsutsui, Takahiko Masuzaki, Takao Onoye, Yukihiro Nakamura
VDEC LSI デザイナーフォーラム, Aug. 2005
Japanese - High quality motion JPEG2000 coding scheme based on the human visual system
R Miyamoto, H Sugita, Y Hayashi, H Tsutsui, T Masuzaki, T Onoye, Y Nakamura
2005 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), VOLS 1-6, CONFERENCE PROCEEDINGS, 2096, 2099, 2005, [Peer-reviewed]
English, International conference proceedings - Video quality enhancement for Motion JPEG2000 encoding based on the human visual system
Ryusuke Miyamoto, Yoshiteru Hayashi, Hiroshi Tsutsui, Takahiko Masuzaki, Takao Onoye, Yukihiro Nakamura
Proc. of 2004 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS2004), 1161, 1164, Dec. 2004, [Peer-reviewed]
English, International conference proceedings - 視覚特性を用いた Motion JPEG2000 レート制御手法
Hiroshi Tsutsui, Yoshiteru Hayashi, Ryusuke Miyamoto, Takahiko Masuzaki, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
第6回 YRP移動体通信産学官交流シンポジウム, 152, 153, Jul. 2004
Japanese - A scalable approach for estimation of focus of expansion
J Ashida, R Miyamoto, H Tsutsui, T Onoye, Y Nakamura
Proceedings of the Fourth IASTED International Conference on Visualization, Imaging, and Image Processing, 6, 11, 2004, [Peer-reviewed]
English, International conference proceedings - Embedded system implementation of scalable and object-based video coding
T Onoye, H Tsutsui, G Fujita, Y Nakamura, Shirakawa, I
Image Processing, Biomedicine, Multimedia, Financial Engineering and Manufacturing, Vol 18, 18, 243, 250, 2004, [Peer-reviewed]
English, International conference proceedings - Scalable design framework for JPEG2000 system architecture
H Tsutsui, T Masuzaki, Y Hayashi, Y Taki, T Izumi, T Onoye, Y Nakamura
ADVANCES IN COMPUTER SYSTEMS ARCHITECTURE, PROCEEDINGS, 3189, 296, 308, 2004, [Peer-reviewed]
English, Scientific journal - JPEG2000 high-speed progressive decoding scheme
H Sugita, VQ Minh, T Masuzaki, H Tsutsui, T Izumi, T Onoye, Y Nakamura
2004 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOL 3, PROCEEDINGS, 3, 873, 876, 2004, [Peer-reviewed]
English, International conference proceedings - High-Level Synthesis Design System for VLSI Processors in the 21st Century
Yukihiro Nakamura, Hiroshi Tsutsui
ASEAN Microelectronics 2003, AUN/SEED-Net Field-wise Seminar, Aug. 2003
English - 高度通信情報システムのためのアーキテクチャと設計技術
Yukihiro Nakamura, Tomonori Izumi, Hiroshi Tsutsui
第5回 YRP移動体通信産学官交流シンポジウム, Jul. 2003
Japanese - Scalable Design Framework for JPEG2000 Encoder Architecture
Yoshiteru Hayashi, Hiroshi Tsutsui, Takahiko Masuzaki, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
Proc. of the 11th Workshop on Synthesis And System Integration of Mixed Information technologies (SASIMI2003), 372, 377, Apr. 2003, [Peer-reviewed]
English, International conference proceedings - Design framework for JPEG2000 encoding system architecture
Y Hayashi, H Tsutsui, T Masuzaki, T Izumi, T Onoye, Y Nakamura
PROCEEDINGS OF THE 2003 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOL II, 2, 740, 743, 2003, [Peer-reviewed]
English, International conference proceedings - A Design of JPEG2000 Encoder by Configurable Processor
Hiroshi Tsutsui, Takahiko Masuzaki, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
Proceedings of the Society Conference of IEICE, 2002, 89, 89, The Institute of Electronics, Information and Communication Engineers, Sep. 2002
Japanese - JPEG2000 Fully Scalable Image Encoder by Configurable Processor
Hiroshi Tsutsui, Takahiko Masuzaki, Masayuki Oyamatsu, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
Proc. of Euromedia Conference, 168, 172, Apr. 2002, [Peer-reviewed]
English, International conference proceedings - Adaptive rate control scheme for JPEG2000 image coding
Takahiko Masuzaki, Hiroshi Tsutsui, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
IEICE General Conference, 2002, 121, 121, The Institute of Electronics, Information and Communication Engineers, Mar. 2002
Japanese - High speed JPEG2000 encoder by configurable processor
H Tsutsui, T Masuzaki, T Izumi, T Onoye, Y Nakamura
APCCAS 2002: ASIA-PACIFIC CONFERENCE ON CIRCUITS AND SYSTEMS, VOL 1, PROCEEDINGS, 1, 45, 50, 2002, [Peer-reviewed]
English, International conference proceedings - Adaptive rate control for JPEG2000 image coding in embedded systems
T Masuzaki, H Tsutsui, T Izumi, T Onoye, Y Nakamura
2002 INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, VOL III, PROCEEDINGS, 3, 77, 80, 2002, [Peer-reviewed]
English, International conference proceedings - JPEG2000 adaptive rate control for embedded systems
T Masuzaki, H Tsutsui, T Izumi, T Onoye, Y Nakamura
2002 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOL IV, PROCEEDINGS, 4, 333, 336, 2002, [Peer-reviewed]
English, International conference proceedings - LUT-array-based PLD and synthesis approach based on sum of generalized complex terms expression
H Tsutsui, A Tomita, S Sugimoto, K Sakai, T Izumi, T Onoye, Y Nakamura
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E84A, 11, 2681, 2689, Nov. 2001, [Peer-reviewed]
English, Scientific journal - Architecture of JPEG2000 encoder for fully scalable image coding
Hiroshi Tsutsui, Takahiko Masuzaki, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
IEICE Society Conference, 2001, 115, Sep. 2001
Japanese - Design of JPEG2000 Encoder for Fully Scalable Image Coding
Hiroshi Tsutsui, Takahiko Masuzaki, Masayuki Oyamatsu, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
Proc. of World Multi-Conference on Systemics, Cybernetics and Informatics (SCI2001), XV, 546, 551, Jul. 2001, [Peer-reviewed]
English, International conference proceedings - Architecture of JPEG2000 encoder for scalable coding
Takahiko Masuzaki, Hiroshi Tsutsui, Masayuki Oyamatsu, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
Technical report of IEICE. DSP, 101, 141(CAS2001 1-28), 63, 70, The Institute of Electronics, Information and Communication Engineers, Jun. 2001
Japanese, This paper describes an architecture of JPEG2000 encoder for fully scalable image coding. To exploit different aspects of scalability inherent in JPEG2000, a set of novel mechanisms for pass termination, layering, and tilepart organization is devised. In addition, the proposed JPEG2000 encoder is implemented through the use of Xtensa configurable processor and optimized by user defined specific instructions. As a result, the number of processor cycles for encoding is reduced approximately by 40 %. - 16bit Free CPU の設計
Hiroshi Tsutsui, Takahiko Masuzaki
in Proc. of the 18th PARTHENON Workshop, May 2001
Japanese - A design of LUT-array-based PLD and a synthesis approach based on sum of generalized complex terms expression
Hiroshi Tsutsui, Kazuhiro Hiwada, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), 5, 203, 206, May 2001, [Peer-reviewed]
English, International conference proceedings - LUTアレイ型PLDの設計と試作
Akihiko Tomita, Shigenori Sugimoto, Hiroshi Tsutsui, Kazuhisa Sakai, Tomonori Izumi, Yukihiro Nakamura
システムLSI琵琶湖ワークショップ, 243, 246, Nov. 2000
Japanese - LUTアレイ型PLDの設計と試作
Shigenori Sugimoto, Akihiko Tomita, Hiroshi Tsutsui, Kazuhisa Sakai, Kazuhiro Hiwada, Yukihiro Nakamura
VDEC LSI デザイナーフォーラム, 85, Sep. 2000
Japanese - A Physical Design of Reconfigurable LUT Array, and a Synthesis Approach based on Sum of Generalized Complex Terms Expression
Hiroshi Tsutsui, Kazuhiro Hiwada, Tomonori Izumi, Takao Onoye, Yukihiro Nakamura
in Proc. of IPSJ DA Symposium, 2000, 8, 21, 26, Jul. 2000, [Peer-reviewed]
Japanese, International conference proceedings - PCAデバイスの設計と試作
Shigenori Sugimoto, Akihiko Tomita, Hiroshi Tsutsui, Kazuhisa Sakai, Kazuhiro Hiwada, Yukihiro Nakamura
in Proc. of the 16th PARTHENON Workshop, 31, 42, May 2000
Japanese - 16bit Free CPU の設計
Ryusuke Miyamoto, Hiroshi Tsutsui, Ryuta Nakanishi
in Proc. of the 16th PARTHENON Workshop, May 2000
Japanese
Other Activities and Achievements
- Foreword.
Shingo Yoshizawa, Hiroshi Tsutsui, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 106, 3, 454, 455, Mar. 2023 - An Evaluation of Energy Consumption Under Different Spreading Factors for LoRa Modulation
Takuya Yasugi, Hiroshi Tsutsui, Takeo Ohgane, Joint Conference of Electrical, Electronics and Information Engineers in Hokkaido, 151, 152, Sep. 2021
Japanese, Summary national conference - Promoting Wagyu Beef Traceability Between Australia and Japan Using Blockchain and IoT Technologies
Hiroshi Tsutsui, Ying He, Takeo Ohgane, The Summaries of Research Announcements, FOOMA JAPAN 2021 Academic Plaza, 28, 88, 91, Jun. 2021, [Lead author], ［Internationally co-authored］
Japanese - An Evaluation of Lightweight Image Compression Using Line-By-Line Adaptive Processing with Golomb Coding
大塚 祐大, 片岸 由奈子, 筒井 弘, Joint Conference of Electrical, Electronics and Information Engineers in Hokkaido, 89, 90, Nov. 2020
Japanese, Summary national conference - An Evaluation of SVM Based Color Detection for Stack Light Indicator Monitoring Systems Using Web Cameras for Automatic Production Lines
髙杉 豪, 筒井 弘, 宮永 喜一, IEICE Society Conference, 85, 85, Sep. 2020
Japanese, Summary national conference - An experimental comparison of CNN- and CRNN-CTC for automatic phrase speech recognition systems using a children's speech database
Yunzhe Wang, Yu Tian, Yoshikazu Miyanaga, Hiroshi Tsutsui, IEICE Technical Report, 120, 51, 49, 54, Jun. 2020
English, Technical report - An Experimental Evaluation of Parking Detection Using Web Cameras in a Parking Area
Takuto Fukusaki, Hiroshi Tsutsui, Yoshikazu Miyanaga, IEICE General Conference, 139, 139, Mar. 2020
Japanese, Summary national conference - High-Throughput Scalable Radix-4 FFT Processor Design and Its Area Evaluation
Tomotaka Kawabata, Hiroshi Tsutsui, Yoshikazu Miyanaga, IEICE General Conference, 124, 124, Mar. 2020, [Domestic magazines]
Japanese, Summary national conference - Hardware Design of High Efficient Wireless Communication Systems for 5G Mobile Networks
Mariko Hirayama, Hiroshi Tsutsui, Yoshikazu Miyanaga, Proceedings of IEICE Hokkaido Section Student Council Internet Symposium, Feb. 2020
Japanese, Summary national conference - 雑音にロバストな音声認識システムのためのランニングスペクトル分析を用いた自動音声区間検出
中越達也, 早坂昇, 筒井弘, 宮永喜一, 電子情報通信学会大会講演論文集(CD-ROM), 2019, ROMBUNNO.A‐15‐2, 05 Mar. 2019
Japanese - 製造ラインにおける状態報告ランプのWebカメラを用いた色判定システムの実験的評価
山田健太郎, 筒井弘, 須藤彰紘, 宮永喜一, 電子情報通信学会大会講演論文集(CD-ROM), 2019, ROMBUNNO.A‐15‐10, 05 Mar. 2019
Japanese - Development of Real-time FHD Loss-Less Video Communication over an 8\times 8 MIMO-OFDM System
Yoshikazu Miyanaga, Junji Yamano, Masaki Miura, Tohru Gotoh, Takashi Imagawa, Hiroshi Tsutsui, 2018 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2018 - Proceedings, 1087, 1090, 04 Mar. 2019
IEEE - A Study of Low Energy Video Encoding Method for Raspberry Pi
福元敦己, 今川隆司, 筒井弘, 宮永喜一, 越智裕之, 電子情報通信学会技術研究報告, 118, 473(SIS2018 37-52), 5‐9, 27 Feb. 2019
Japanese - A Study of Global Motion Compensation for Frame Interpolation with High‐Resolution and High‐Frame Rate Video
浮橋慶太, 今川隆司, 筒井弘, 宮永喜一, 越智裕之, 電子情報通信学会技術研究報告, 118, 473(SIS2018 37-52), 53‐58, 27 Feb. 2019
Japanese - An Evaluation of Offline Video Analysis Acceleration for Surveillance Cameras Utilizing Multi-core Processors with Frame-level Parallelization
福﨑 卓人, 筒井 弘, 宮永 喜一, Proceedings of IEICE Hokkaido Section Student Council Internet Symposium, Feb. 2019
Japanese, Summary national conference - Accuracy on Children's Speech Recognition under Noisy Circumstances
Yu Tian, Jiayue Tang, Xiaonan Jiang, Hiroshi Tsutsui, Yoshikazu Miyanaga, ISCIT 2018 - 18th International Symposium on Communication and Information Technology, 101, 104, 24 Dec. 2018 - An Accuracy Evaluation of Fingerprint Database Constructed by Mean-Shift Clustering for WiFi Indoor Positioning Systems
Myat Hsu Aung, Hiroshi Tsutsui, Yoshikazu Miyanaga, Proceedings of 2018 Winter International Symposium on Big-Data, Cybersecurity and IoT, Dec. 2018, [International Magazine]
English, Introduction international proceedings - WiFi Indoor Positioning System Using Fingerprint Database Constructed by Mean-Shift Clustering with Estimated Reference Locations
Myat Hsu Aung, Hiroshi Tsutsui, Yoshikazu Miyanaga, Proceedings of the GSB Student Workshop, The 2nd GI-CoRE GSQ, GSB & IGM Joint Symposium, Aug. 2018, [International Magazine]
English, Introduction international proceedings - A Min‐Sum LDPC Decoder with Variable Parallelism and Its Memory Bank Access Scheduling Method
渡辺大詩, 筒井弘, 今川隆司, 宮永喜一, 映像情報メディア学会技術報告, 42, 23(BCT2018 60-72), 47‐50, 19 Jul. 2018
Japanese - Rejection criterion for keyword recognition system
Xiaonan Jiang, Tatsuya Nakagoshi, Jiayue Tang, Riku Takanashi, Yu Tian, Hiroshi Tsutsui, Yoshikazu Miyanaga, IEICE Technical Report, 118, 149, 53, 58, Jul. 2018
English, Technical report - MMSE Based Low Complexity Maximum Likelihood Detection Using Successive Interference Canceller for MIMO‐OFDM Hardware Implementation
池下貴大, 渡辺大詩, 筒井弘, 宮永喜一, 映像情報メディア学会技術報告, 42, 11(BCT2018 38-49), 25‐28, 02 Mar. 2018
Japanese - A Study on Quality Improvement of Frame Interpolation Method with High‐Resolution and High‐Frame Rate Video Using Foreground Elimination and Contour Extraction
井原大文, 今川隆司, 上坂浩貴, 鴻上慎吾, 筒井弘, 宮永喜一, 越智裕之, 電子情報通信学会技術研究報告, 117, 455(VLD2017 89-128), 55‐60, 21 Feb. 2018
Japanese - FHD loss-less video communication over 8 × 8 MIMO-OFDM
Yoshikazu Miyanaga, Hiroshi Tsutsui, Takashi Imagawa, 2017 17th International Symposium on Communications and Information Technologies, ISCIT 2017, 2018-January, 1, 5, 16 Jan. 2018
IEEE - 並列化を用いたLDPC Min‐Sum復号器の高スループットハードウェア設計
渡辺大詩, 池下貴大, 筒井弘, 今川隆司, 宮永喜一, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.71, 28 Oct. 2017
Japanese - Foreword.
Hiroshi Tsutsui, Mitsuji Muneyasu, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 100-A, 11, 2219, 2220, 2017 - チップ試作による最小動作電圧予測手法の評価
川島 潤也, 筒井 弘, 越智 裕之, 佐藤 高史, 電子情報通信学会ICD研究会, ICD2012-87, 3, 8, Dec. 2012
Japanese - Accurate I/O Buffer Impedance Self-adjustment using Threshold Voltage and Temperature Sensors
Zhi Li, Hiroshi Tsutsui, Hiroyuki Ochi, Takashi Sato, 研究報告システムLSI設計技術（SLDM）, 2012, 21, 1, 6, 19 Nov. 2012
With the increased operating frequency and the reduction of feature size, achieving low error-rate data transmission between LSIs is an important field of research. In particular, input/output (I/O) impedance matching, as one of the necessary technologies for high-speed transmission, is strongly required. In this paper, we propose an architecture of output buffer whose impedance is self-adjustable against process variation and temperature characteristic of MOS transistors. The proposed architecture utilizes on-chip sensor circuits to capture threshold voltages and temperatures. Based on a commercial 65nm CMOS technology, the proposed method has been verified. Without the use of reference resistor, it successfully adjusts the I/O impedance within 2.36% and 1.4% around a target of 50Ω through simulation and measurement, respectively, regardless of the process parameters and temperature.With the increased operating frequency and the reduction of feature size, achieving low error-rate data transmission between LSIs is an important field of research. In particular, input/output (I/O) impedance matching, as one of the necessary technologies for high-speed transmission, is strongly required. In this paper, we propose an architecture of output buffer whose impedance is self-adjustable against process variation and temperature characteristic of MOS transistors. The proposed architecture utilizes on-chip sensor circuits to capture threshold voltages and temperatures. Based on a commercial 65nm CMOS technology, the proposed method has been verified. Without the use of reference resistor, it successfully adjusts the I/O impedance within 2.36% and 1.4% around a target of 50Ω through simulation and measurement, respectively, regardless of the process parameters and temperature., English - A study on parameter estimation for modeling of random-telegraph noise
粟野 皓光, 清水 裕史, 筒井 弘, 越智 裕之, 佐藤 高史, 研究報告システムLSI設計技術（SLDM）, 2011, 15, 1, 6, 21 Nov. 2011
ランダムテレグラフノイズ (Random Telegraph Noise: RTN) は微細デバイスの信頼性や回路特性に関わる物理現象であり，様々なモデル化手法が提案されている．閾値電圧の変動'|届と変動時定数は，種々のモデルに共通する特に重要なパラメータであるが，測定データからこれらを求めることは困難な課題となっている．本研究では，キャリアの捕獲と放出の過程を統計的モデルとして表現し，マルコフ連鎖モンテカルロ法 (MCMC） を用いて各パラメータをベイズ推定する手法を提案する．人工的に生成した RTN 信号に提案手法を適用し，良好な結果が得られたが，実測信号については課題も見られた．Random Telegraph Noise (RTN) is a physical phenomenon that is considered to determine reliability and performance of circuits. Time constants of carrier capture and emission, and an associated change of threshold voltage are the important parameters commonly involved in various models, but their extraction from time-domain observations has been a difficult task. In this study, we propose a statistical method for estimating the time constants and the magnitude of threshold voltage shift. Our method is based on a graphical network representation and the parameters are estimated using Markov Chain Monte Carlo (MCMC) method. Experimental application of the proposed method on a synthetic time-domain RTN signal was very successful, while estimation examples on measured RTN signals suggest there is room for further improvement., Japanese - A Fast Transient Analysis of Linear Circuit using Quasi Zero Variance Importance Sampling
宮川 哲朗, 筒井 弘, 越智 裕之, 佐藤 高史, 研究報告システムLSI設計技術（SLDM）, 2011, 13, 1, 6, 21 Nov. 2011
ランダムウオークによる線形回路の過渡解析を高速化する手法を提案する．提案手法では，準ゼロ分散推定法に基づいて逐次的な確率更新を行う際に，一解析時刻前の節点電圧を利用して解析に必要なサンプル数を削減する．また解析中にサンプル数を自動的決定することにより，節点電位の変動による推定の不安定化を防止しつつ高速化を図る．提案手法により，従来のランダムウォーク法に基づく過渡解析に対して 10 倍以上の高速化を実現し，サンプル数自動決定により高速化と解析の安定化の両立を実現した．We propose a method to accelerate random walk based transient analysis of linear circuits. Our method uses quasi-zero-variance estimation with adaptive sample number determination, in which walk probabilities are adaptively updated to reduce estimation variance. The node voltages of previous time step are reused to give initial guesses for alternative probabilities at every time point, which reduces the total number of required samples. An adaptive determination of the number of samples makes estimation very stable and accelerate the analysis even further. The proposed analysis achieves more than 10x speedup against the conventional method., Japanese - An Acceleration Method for Power Grid Analysis using Block-Iterative Algorithm
森下 拓海, 筒井 弘, 越智 裕之, 佐藤 高史, 研究報告システムLSI設計技術（SLDM）, 2011, 12, 1, 5, 21 Nov. 2011
半導体プロセスの微細化が進み，電源回路網の解析が重要になっている．また，電源回路網それ自体の規模も大きく，今後のさらなる巨大化に対応するためにも，回路解析の高速化省メモリ化が大きな課題となっている．ブロック反復法は直接法と反復法を組み合わせた解析方法であり，大規模電源回路網解析への応用が期待されている．本稿ではブロック反復法の高速化を目的として，SOR 法およびブロック分割の観点から収束の加速方法を検討する．Because of its extremely large size, power grid analysis has been a computationally challenging problem both in terms of runtime and memory usage. LU factorization has been widely used to analyze voltage drop simulations due to its stability, but contiguous technology scaling demands even more efficient calculation methods. In this paper, application of block-iterative method, which combines LU factorization and iterative method, is proposed for efficient analysis of power grid analysis. Automatic adjustment of relaxation factor in successive over-relaxation method and block decomposition algorithm are proposed. Evaluation results are also presented., Japanese - A Design of LUT-Array-Based PLD
TOMITA Akihiko, SUGIMOTO Shigenori, TSUTSUI Hiroshi, SAKAI Kazuhisa, HIWADA Kazuhiro, IZUMI Tomonori, ONOYE Takao, NAKAMURA Yukihiro, Technical report of IEICE. VLD, 100, 473, 173, 178, 23 Nov. 2000
This paper proposes an architecture of LUT-array-based PLD, which is based on an 3-inputs LUT array instead of an AND array that PLA is based on. Utilizing cascaded 3-inputs LUTs, each of which can express an arbitrary Boolean function with three inputs, logic circuits can be mapped effectively to the PLD in compared with ordinary PLAs. In addition, an address decoding mechanism is devised to have an ability to treat a set of LUTs as an LUT with large number of inputs or a memory. Experimental results show that benchmark circuits can be mapped with 14.9% less number of terms to LUT-array-based PLD than that to PLA., The Institute of Electronics, Information and Communication Engineers, Japanese
Lectures, oral presentations, etc.
Courses
- Media Processing System
Hokkaido University
Apr. 2022 - Present - Exercise in Media Network Ⅰ
Hokkaido University
Apr. 2015 - Present - Media Network Laboratory ⅡB
Oct. 2014 - Present - Media Network Laboratory ⅠB
Hokkaido University
Apr. 2014 - Present - Exercise in Media Network Ⅱ
Hokkaido University
Apr. 2014 - Present - Network Design
Hokkaido University
Apr. 2014 - Present - Network Systems
Hokkaido University
Oct. 2013 - Present - 電気電子工学実験B
京都大学
Affiliated academic society
- Apr. 2017 - Present
THE INSTITUTE OF IMAGE INFORMATION AND TELEVISION ENGINEERS - Feb. 2012 - Present
INFORMATION PROCESSING SOCIETY OF JAPAN - Sep. 2003 - Present
ACM - Apr. 2001 - Present
THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS - 2000 - Present
IEEE - Dec. 1996 - Present
THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN - パルテノン研究会
- THE INSTITUTE OF IMAGE ELECTRONICS ENGINEERS OF JAPAN
Research Themes
- 細分化深層学習による到来方向推定と実測検証
科学研究費助成事業
01 Apr. 2023 - 31 Mar. 2027
大鐘 武雄, 筒井 弘, 西村 寿彦
各到来波数に対応した特化型DNNの設計を図ることが大きな目標であった．そのため，まず3波到来環境に適したDNNを構築した．さらに，SN比に応じて訓練したSNR特化型DNNで推定すると特性が向上することから，あるSNRと推定波数における特化型DNNの構築を図った．次に，これを用いて，2波到来環境と3波到来環境に対応可能なシステムを構築するため，到来波数を推定するDNNとSNRを推定するDNNとを用意し，これらの推定結果を基に，最適な特化型DNNを選択する手法を採用した．その結果，2波到来環境で約95%以上に，3波到来環境においても約85%の成功率を達成できた．しかし，低SNR環境や，3波到来環境の成功率はまだ不十分であることも明らかとなった．
低SNR環境での問題は，データに含まれる雑音が無駄な入力となっているということである．そこで，入力データに対して主成分分析を行い，SNRに応じて入力次元を削減することを新たに提案した．その結果，SNR=0dBの環境において，推定成功率を約10%から60%以上に改善することができた．
3波到来環境においては，推定失敗例を解析した結果，3波が約20度以内の範囲に集中している場合に推定誤りが多く発生していることがわかった．そこで，3波が約20度以内の範囲に集中している場合を想定した近接波特化型DNNを構築し，通常の特化型DNNでの推定結果において3波が約20度以内の範囲に集中している場合には，前記の近接波用DNNを再度適用し直すことを行なった．これにより，推定成功率を約99%に向上することができた．
実測用USRPに関しては，Lora変調を用いて通信実験を行うことができた．
日本学術振興会, 基盤研究(B), 北海道大学, 23K26101 - 細分化深層学習による到来方向推定と実測検証
科学研究費助成事業
01 Apr. 2023 - 31 Mar. 2027
大鐘 武雄, 筒井 弘, 西村 寿彦
日本学術振興会, 基盤研究(B), 北海道大学, 23H01406 - Cross-Layer Energy Optimization with Adaptive Control for Ultra-Low Power IoT Sensor Nodes
Grants-in-Aid for Scientific Research
01 Apr. 2023 - 31 Mar. 2026
筒井 弘
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 23K11026 - 極低消費電力型マルチメディアIoTシステムの研究開発
戦略的情報通信研究開発推進事業（SCOPE）先進的電波有効利用型
Apr. 2020 - Mar. 2021
筒井 弘
総務省, 北海道大学, Principal investigator - Study on 3D stress-free HMD using electronic holography
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
01 Apr. 2016 - 31 Mar. 2020
Sakamoto Yuji
We succeeded in developing head-mounted displays (holo-HMDs) with the world's smallest and lightest electronic holography technology. In addition, we have proposed a method that enables real-time calculation and communication at the current level of hardware technology though researches of high-speed calculation methods and data compression methods. These researches indicate that the holo-HMD can be realized as a system. On the other hand, the deterioration of image quality due to speckles is a remained problem, but we have proposed the suppression method using an algorithm and showed the possibility of suppression. It is necessary to continue to study the measurement of physiological responses.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 16H02852 - 極低消費電力型マルチメディアIoTシステムの研究開発
戦略的情報通信研究開発推進事業（SCOPE）先進的電波有効利用型
Mar. 2018 - Mar. 2020
宮永 喜一, 筒井 弘
総務省, 北海道大学, Coinvestigator - 戦略的情報通信研究開発推進事業（SCOPE）先進的電波有効利用型
Apr. 2018 - Mar. 2019
岡田 健一, 堀 真一, 大島 直樹, 筒井 弘
総務省, 北海道大学, Coinvestigator - A Study on Efficient Video Acquisition Approach based on Motion-Compensated Frame Interpolation Using High-Resolution Video and High-Frame-Rate Video
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
01 Apr. 2014 - 31 Mar. 2017
Tsutsui Hiroshi
Recent CMOS image sensors have several image acquisition modes such as (1) high-resolution and normal-frame-rate and (2) low-resolution and high-frame-rate. Assuming these two types of video, that is high-resolution video and high-frame-rate video, can be obtained simultaneously, a motion-compensated frame interpolation method to generate high-resolution and high-frame-rate video from these videos is proposed. By using the proposed approach, efficient video acquisition can be archived. Considering adaptive processing based on motions in video sequences, a image shrinking based high-speed moving region extraction method is also proposed.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, 26870009 - Architecture for Large-scale Long-term Digital Storage System
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
2011 - 2013
OCHI Hiroyuki, SATO Takashi, TSUTSUI Hiroshi, NAKAMURA Yukihiro
To realize digital data storage systems of extremely long lifetime, architecture for sealed wafer-scale mask ROM that is capable of contactless power delivery and contactless mutual communication has been investigated in order to enhance robustness of mask ROM device.
As for contactless power delivery, on-chip solar cell has been investigated, and "boost interleaved solar cell" has been proposed. As for contactless mutual communication, low power Tx/Rx circuits to utilize on-chip dipole antenna. NAND-type high-density low operating voltage mask ROM has been designed and evaluated. Finally, hierarchical architecture with aggressive power-gating feature has been developed.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), 京都大学, Coinvestigator not use grants, Competitive research funding, 23300015 - Acceleration of Timing Analysis using Monte Carlo Methods
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
2010 - 2012
SATO Takashi, OCHI Hiroyuki, TSUTSUI Hiroshi
Timing constraint is one of the most important objectives in advanced integrated circuit design. In this project, acceleration of the timing analysis is studied. Based on the measurements on test-chips, variability- and degradation-aware device models have been first proposed to accurately handle timing information of miniaturized devices. A new algorithm of timing analysis has then been implemented on a hardware, thorough which by more than ten times acceleration has been achieved while maintaining advantages of Monte Carlo based methods that can handle arbitrary delay distribution.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Kyoto University, Coinvestigator not use grants, Competitive research funding, 22360143 - スケーラブル動画像符号化の組込み向け実装法に関する研究
科学研究費助成事業
2002 - 2004
筒井 弘
本研究の目的は,スケーラブル動画像符号化の組込み機器への効率的な実装手法の提案である.前年度までに於て,JPEG2000スケーラブル符号化/復号化を対象として,様々なシステム要求に対して最適な実装を容易かつ効率的に実現可能とするスケーラブルなデザインフレームワークの実現を目標とし,検討および実装/評価を行っている.本年度は,これまでに実装を行ったソフトウェアならびにハードウェア処理モジュールを組合せ,フレームワークの全体の構築を行い,「組込み向けJPEG2000符号化方式の実装法」と題した博士論文にまとめた.提案デザインフレームワークでは,アプリケーションの要求や設計時の制約条件に応じて,共通モジュールを選択的に利用することによって,最適なJPEG2000復号器/復号器/コーデックの実装を得ることができる.
さらに,JPEG2000で各フレームを圧縮する動画像符号化方式であるMotion JPEG2000に関して,組込み機器での利用が見込まれる,低ビットレート符号化時における主観画質の向上手法を提案した.提案手法ではJPEG2000の持つ特長と人間の視覚特性を利用して,Motion JPEG2000の主観的画質を向上させる.JPEG2000は変換に離散ウェーブレット変換(DWT)を用いているために,符号化の過程で画像内の位置に応じて符号量の割り当てを制御することが容易となっている.人間の視覚特性は刺激の空間周波数,時間周波数に依存して特性が変化し,周波数が高いほど感度が低下する.提案する手法は,人間の視覚特性を利用して,時間周波数,空間周波数が高い領域に割り当てる符号量を減らし,それ以外の領域に割り当てる符号量を増やす.その結果,動画像全体の主観的画質を向上させることに成功した.
日本学術振興会, 特別研究員奨励費, 京都大学, 02J02016
