Research activity information

• Jan. 2024 IEEE 42nd International Conference on Consumer Electronics, Best Student Poster Award, Wearable Perspiration Characteristic Sensor Using Bi-Directional Driver Circuit

  R. Takamatsu, S. Izumi, H. Kawaguchi


• Nov. 2023 電気学会 第40回「センサ・マイクロマシンと応用システム」シンポジウム, 優秀ポスター発表賞, マイクロ波ドップラーセンサを用いた非接触生体認証

  高橋 宏太, 和泉 慎太郎, 川口 博


• Oct. 2020 看護理工学学会, 看護理工学学会奨励賞, 情報通信機器を活用した総合周産期母子医療センター 夜勤シフトにおける助産師の滞在場所と滞在時間の分析

  西川 美樹, 齋藤 いずみ, 大滝 千文, 和泉 慎太郎


• Sep. 2019 電子情報通信学会ヘルスケア・医療情報通信技術研究専門委員会, ヘルスケア・医療情報通信技術研究賞 優秀研究賞, 光電式容積脈波法を用いた脈拍測定の低消費電力化手法

  渡辺 健斗, 和泉 慎太郎, 矢野 祐二, 川口 博, 吉本 雅彦


• Jun. 2019 看護理工学会, 研究奨励賞, 産科混合病棟における看護職の滞在場所と滞在時間

  齋藤 いずみ, 和泉 慎太郎, 大滝 千文, 岩佐 由美, 大澤 佳代


• May 2019 電子情報通信学会, LSIとシステムのワークショップ2019 優秀ポスター賞, 有機トランジスタと薄膜抵抗を集積したシート型計装アンプの開発と生体センサへの応用

  杉山 真弘, 植村 隆文, 近藤 雅哉, 秋山 実邦子, 難波 直子, 井上 由美, 吉本 秀輔, 和泉 慎太郎, 関谷 毅


• 2018 電子情報通信学会, 電子情報通信学会ELEX Best Paper Award, A low power, VLSI object recognition processorusing Sparse FIND Feature for 60fps HDTV resolution video

  Matsukawa Go, Kodamda Taisuke, Nishizumi Yuri, Kajihara Koichi, Nakanishi Chikako, IZUMI Shintaro, KAWAGUCHI Hiroshi, Goto Toshio, Kato Takeo, YOSHIMOTO Masahiko

  Official journal


• Sep. 2017 IEEE International Workshop on Machine Learning for Signal Processing (MLSP), Sep. 2017., Best Student Paper Award, A Layer-Block-Wise Pipeline For Memory And Bandwidth Reduction In Distributed Deep Learning

  MORI Haruki, YOUKAWA Tetsuya, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi, INOUE Atsuki

  International society


• Dec. 2016 IEEE International Conference on Electronics, Circuits, and Systems (ICECS), IEEE ICECS 2016 Best Paper Award, Dec. 2016, An Low-Energy 8T Dual-Port SRAM for Image Processor with Selective Sourceline Drive Scheme in 28-nm FD-SOI Process Technology

  MORI Haruki, NAKAGAWA Tomoki, KITAHARA Yuki, KAWAMOTO Yuta, TAKAGI Kenta, YOSHIMOTO Shusuke, IZUMI Shintaro, YOSHIMOTO Masahiko

  International society


• May 2016 電子情報通信学会集積回路研究専門委員会, LSIとシステムのワークショップ2016 優秀ポスター賞（学生部門）, プロセスばらつき耐性を有する低電圧動作STT-MRAM向けカウンターベース読出し回路

  UMEKI Yohei, YANAGIDA Kouji, YOSHIMOTO Shusuke, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi, TSUNODA Koji, SUGII Toshihiro

  Japan society


• May 2014 電子情報通信学会集積回路研究専門委員会, 優秀ポスター賞, 38μAウェアラブル生体情報計測プロセッサ

  中井 陽三郎, IZUMI SHINTARO, 山下 顕, 中野 将尚, 藤井 貴英, 小西 恵大, KAWAGUCHI HIROSHI, 木村 啓明, 丸元 共治, 渕上 貴昭, 藤森 敬和, 中嶋 宏, 志賀 利一, YOSHIMOTO MASAHIKO

  Japan society

• Flexible Optical Tactile Force Sensor to Conduct Measurements From the Back of the Hand

  Kosuke Ando, Minon Kushihashi, Hiroshi Kawaguchi, Shintaro Izumi

  Apr. 2025, IEEE Sensors Journal

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Prospective observational study of 2 wearable strain sensors for measuring the respiratory rate.

  Hiroki Sato, Tatsuya Nagano, Shintaro Izumi, Jun Yamada, Daisuke Hazama, Naoko Katsurada, Masatsugu Yamamoto, Motoko Tachihara, Yoshihiro Nishimura, Kazuyuki Kobayashi

  The respiratory rate is an important factor for assessing patient status and detecting changes in the severity of illness. Real-time determination of the respiratory rate will enable early responses to changes in the patient condition. Several methods of wearable devices have enabled remote respiratory rate monitoring. However, gaps persist in large-scale validation, patient-specific calibration, standardization and their usefulness in clinical practice has not been fully elucidated. The aim of this study was to evaluate the accuracy of 2 wearable stretch sensors, C-STRECH® which is used in clinical practice and a novel stretchable capacitor in measuring the respiratory rate. The respiratory rate of 20 healthy subjects was measured by a spirometer with the stretch sensor applied to 1 of 5 locations (umbilicus, lateral abdomen, epigastrium, lateral chest, or chest) of their body at rest while they were in a sitting or supine position before or after exercise. The sensors detected the largest amplitudes at the epigastrium and umbilicus compared to other sites of measurement for the sitting and supine positions, respectively. At rest, the respiratory rate of the sensors had an error of 0.06 to 2.39 breaths/minute, whereas after exercise, an error of 1.57 to 3.72 breaths/minute was observed compared to the spirometer. The sensors were able to detect the respiratory rate of healthy volunteers in the sitting and supine positions, but there was a need for improvement in detection after exercise.

  Jul. 2024, Medicine, 103(29) (29), e38818, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Sleep Apnea Detection Using Oxygen Saturation During Nocturnal Sleep.

  Nobuhito Taniguchi, Hiroshi Kawaguchi, Tatsuya Nagano, Shintaro Izumi

  The early detection and treatment of sleep apnea syndrome (SAS) is becoming an important issue in medical practice, as the conventional polysomnography-based method is not only costly, but also demands high expertise from technicians. In this study, we propose a method for diagnosing SAS using noninvasive measurements of oxygen saturation (SpO2), obtained from a pulse oximeter as the input signal, using convolutional neural networks (CNNs). As a result of 10-fold cross-validation, we confirmed that the proposed method yields an 88.99% accuracy.

  Jul. 2024, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2024, 1 - 4, English, International magazine

  Scientific journal


• Evaluation of Patients' Levels of Walking Independence Using Inertial Sensors and Neural Networks in an Acute-Care Hospital.

  Tatsuya Sugimoto, Nobuhito Taniguchi, Ryoto Yoshikura, Hiroshi Kawaguchi, Shintaro Izumi

  This study aimed to evaluate walking independence in acute-care hospital patients using neural networks based on acceleration and angular velocity from two walking tests. Forty patients underwent the 10-m walk test and the Timed Up-and-Go test at normal speed, with or without a cane. Physiotherapists divided the patients into two groups: 24 patients who were monitored or independent while walking with a cane or without aids in the ward, and 16 patients who were not. To classify these groups, the Transformer model analyzes the left gait cycle data from eight inertial sensors. The accuracy using all the sensor data was 0.836. When sensor data from the right ankle, right wrist, and left wrist were excluded, the accuracy decreased the most. When analyzing the data from these three sensors alone, the accuracy was 0.795. Further reducing the number of sensors to only the right ankle and wrist resulted in an accuracy of 0.736. This study demonstrates the potential of a neural network-based analysis of inertial sensor data for clinically assessing a patient's level of walking independence.

  May 2024, Bioengineering (Basel, Switzerland), 11(6) (6), English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of the walking independence on lower extremity and trunk muscle activity during straight-leg raising following incomplete cervical cord injury.

  Tatsuya Sugimoto, Ryoto Yoshikura, Toshiyuki Maezawa, Kojiro Mekata, Yuya Ueda, Hiroshi Kawaguchi, Shintaro Izumi

  Feb. 2024, Scientific reports, 14(1) (1), 4363 - 4363, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Ultraflexible Wireless Imager Integrated with Organic Circuits for Broadband Infrared Thermal Analysis

  Rei Kawabata, Kou Li, Teppei Araki, Mihoko Akiyama, Kaho Sugimachi, Nozomi Matsuoka, Norika Takahashi, Daiki Sakai, Yuto Matsuzaki, Ryo Koshimizu, Minami Yamamoto, Leo Takai, Ryoga Odawara, Takaaki Abe, Shintaro Izumi, Naoko Kurihira, Takafumi Uemura, Yukio Kawano, Tsuyoshi Sekitani

  Wiley, Jan. 2024, Advanced Materials, 36(15) (15), e2309864, English, International magazine

  Scientific journal


• 3-D Object Reconstruction From Outdoor Ultrasonic Image and Variation Autoencoder

  Ryotaro Ohara, Yuto Yasuda, Riku Hamabe, Shun Sato, Ishii Toru, Shintaro Izumi, Hiroshi Kawaguchi

  2024, IEEE Open Journal of Ultrasonics, Ferroelectrics, and Frequency Control

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• MicroSync: Sub-Micro Second Accuracy Wireless Time Synchronization Service

  Ryotaro Ohara, Shintaro Izumi, Shoya Imanaka, Tetsuo Yamamura, Ishii Toru, Hiroshi Kawaguchi

  2024, IEEE Access

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Case Study for Improving Performances of Deep-Learning Processor with MRAM.

  Ryotaro Ohara, Atsushi Fukunaga, Masakazu Taichi, Masaya Kabuto, Riku Hamabe, Masato Ikegawa, Shintaro Izumi, Hiroshi Kawaguchi 0001

  2024, IPSJ Trans. Syst. LSI Des. Methodol., 17, 7 - 15

  Scientific journal


• Wearable Perspiration Characteristic Sensor Using Bi-Directional Driver Circuit.

  Ryo Takamatsu, Shintaro Izumi, Hiroshi Kawaguchi 0001

  2024, ICCE, 1 - 6

  International conference proceedings


• An Ultrasound-Based Surveillance System for Bathroom Posture and Location Estimation.

  Shun Sato, Ryotaro Ohara, M. Shahrul Amir Kamarulzaman, Yuto Yasuda, Shintaro Izumi, Hiroshi Kawaguchi 0001

  2024, ICCE, 1 - 5

  International conference proceedings


• 15-ch Wearable Body Surface Potential Sensor for Wireless Electrocardiogram Monitoring.

  Yusaku Goto, Shintaro Izumi, Ryotaro Ohara, Teppei Araki, Sho Murase, Hiroshi Kawaguchi 0001

  2024, ICCE, 1 - 5

  International conference proceedings


• Broadband Photodetectors and Imagers in Stretchable Electronics Packaging.

  Teppei Araki, Kou Li, Daichi Suzuki, Takaaki Abe, Rei Kawabata, Takafumi Uemura, Shintaro Izumi, Shuichi Tsuruta, Nao Terasaki, Yukio Kawano, Tsuyoshi Sekitani

  Jul. 2023, Advanced materials (Deerfield Beach, Fla.), 36(20) (20), e2304048, English, International magazine

  Scientific journal


• Estimating Person Location in Bathroom with Spatial Ultrasound and Variational autoencoder

  Shun Sato, Yuto Yasuda, Ryotaro Ohara, Riku Hamabe, Takayuki Genda, Shoya Imanaka, Shintaro Izumi, Hiroshi Kawaguchi

  2023, IEEE International Ultrasonics Symposium, IUS

  International conference proceedings


• Contactless respiration measurement system using 25-kHz spatial ultrasound Doppler sensor

  Kousei Kawai, Ryotaro Ohara, Shun Sato, Toru Ishii, Shintaro Izumi, Hiroshi Kawaguchi

  2023, IEEE International Ultrasonics Symposium, IUS

  International conference proceedings


• Estimated Results of R-R Interval Using a Small Card-Sized VHF-Band Contactless Heartbeat Sensor Module.

  Saki Wada, Kengo Nishimoto, Yoshio Inasawa, Shintaro Izumi

  2023, BSN, 1 - 4

  International conference proceedings


• Quantitative Evaluation Method of Timed Up and Go Test for Hospitalized Patients Using Inertial Sensors.

  Tatsuya Sugimoto, Ryoto Yoshikura, Hiroshi Kawaguchi 0001, Shintaro Izumi

  2023, BSN, 1 - 4

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• A 1W8R 20T SRAM Codebook for 20% Energy Reduction in Mixed-Precision Deep-Learning Inference Processor System.

  Ryotaro Ohara, Masaya Kabuto, Masakazu Taichi, Atsushi Fukunaga, Yuto Yasuda, Riku Hamabe, Shintaro Izumi, Hiroshi Kawaguchi

  2023, AICAS, 1 - 5

  International conference proceedings


• Stretchable printed circuit board integrated with Ag-nanowire-based electrodes and organic transistors toward imperceptible electrophysiological sensing

  Rei Kawabata, Teppei Araki, Mihoko Akiyama, Takafumi Uemura, Tianxu Wu, Hirotaka Koga, Yusuke Okabe, Yuki Noda, Shuichi Tsuruta, Shintaro Izumi, Masaya Nogi, Katsuaki Suganuma, Tsuyoshi Sekitani

  Dec. 2022, Flexible and Printed Electronics, 7(4) (4)

  Scientific journal


• 3D Reconstruction from Outdoor Ultrasonic Image Using Variation Autoencoder

  Ryotaro Ohara, Yuto Yasuda, Riku Hamabe, Ishii Toru, Shintaro Izumi, Hiroshi Kawaguchi

  IEEE, Oct. 2022, 2022 IEEE International Ultrasonics Symposium (IUS)


• Millimeter-Precision Ultrasonic DSSS Positioning Technique With Geometric Triangle Constraint

  Ishii Toru, Yuto Yasuda, Shun Sato, Shintaro Izumi, Hiroshi Kawaguchi

  Institute of Electrical and Electronics Engineers ({IEEE}), Aug. 2022, IEEE Sensors Journal, 22(16) (16), 16202 - 16211

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Skin‐Like Transparent Sensor Sheet for Remote Healthcare Using Electroencephalography and Photoplethysmography

  Teppei Araki, Shusuke Yoshimoto, Takafumi Uemura, Aiko Miyazaki, Naoko Kurihira, Yuko Kasai, Yoshiko Harada, Toshikazu Nezu, Hirokazu Iida, Junko Sandbrook, Shintaro Izumi, Tsuyoshi Sekitani

  Wiley, Jul. 2022, Advanced Materials Technologies, 7(11) (11), 2200362 - 2200362

  Scientific journal


• A high prevalence of myeloid malignancies in progeria with Werner syndrome is associated with p53 insufficiency.

  Hisaya Kato, Yoshiro Maezawa, Dai Nishijima, Eisuke Iwamoto, June Takeda, Takashi Kanamori, Masaya Yamaga, Tatsuzo Mishina, Yusuke Takeda, Shintaro Izumi, Yutaro Hino, Hiroyuki Nishi, Jun Ishiko, Masahiro Takeuchi, Hiyori Kaneko, Masaya Koshizaka, Naoya Mimura, Masafumi Kuzuya, Emiko Sakaida, Minoru Takemoto, Yuichi Shiraishi, Satoru Miyano, Seishi Ogawa, Atsushi Iwama, Masashi Sanada, Koutaro Yokote

  May 2022, Experimental hematology, 109, 11 - 17, English, International magazine

  Scientific journal


• Effectiveness of the heartbeat interval error and compensation method on heart rate variability analysis

  Ayaka Shintomi, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Institution of Engineering and Technology ({IET}), Feb. 2022, Healthcare Technology Letters, 9(1-2) (1-2), 9 - 15, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Correction to: Analysis of nocturnal desaturation waveforms using algorithms in patients with idiopathic pulmonary fibrosis.

  Yuichiro Yasuda, Tatsuya Nagano, Shintaro Izumi, Mina Yasuda, Kosuke Tsuruno, Kazunori Tobino, Kyosuke Nakata, Kayoko Okamura, Teruaki Nishiuma, Kiyonobu Takatsuki, Yasuhiro Funada, Hisashi Ohnishi, Masatsugu Yamamoto, Yoshihiro Nishimura, Kazuyuki Kobayashi

  Jan. 2022, Sleep & breathing = Schlaf & Atmung, 26(3) (3), 1503 - 1503, English, International magazine

  Scientific journal


• Machine Learning-Based Severity Classification of Spinal Cord Injury Patients Using Straight Leg Raising Test.

  Ryoto Yoshikura, Shintaro Izumi, Tatsuya Sugimoto, Hiroshi Kawaguchi

  IEEE, 2022, 2022 IEEE Sensors, 2022-October, 1 - 4

  International conference proceedings


• Heartbeat Waveform Measurement Results of Several Persons Using a Small Card-Sized VHF-band Hearbeat Sensor Module.

  Saki Wada, Kengo Nishimoto, Yoshio Inasawa, Shintaro Izumi

  IEEE, 2022, 2022 IEEE Sensors, 1 - 4

  International conference proceedings


• Non-contact Atrial Fibrillation Detection using a 24-GHz Microwave Doppler Radar.

  Shintaro Izumi, Sho Murase, Itsumi Fukuda, Kenta Taki, Kazunori Toyama, Tadashi Inuzuka, Hideki Mochizuki, Hiroshi Kawaguchi

  IEEE, 2022, 2022 IEEE Sensors, 1 - 4

  International conference proceedings


• 20-µs Accuracy Time-Synchronization Method using Bluetooth Low Energy for Internet-of-Things Sensors.

  Masayasu Harada, Shintaro Izumi, Ryosuke Kozeni, Yukiko Yoshikawa, Toru Ishii, Hiroshi Kawaguchi, Shohei Uemura, Kaname Araki

  IEEE, 2022, 19th IEEE Annual Consumer Communications & Networking Conference(CCNC), 181 - 186

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• 産科混合病棟の夜勤帯における産婦の存在が産婦以外の患者の病室に看護師・助産師が滞在する時間に及ぼす影響(Effects of the presence of parturient women on the length of time that nurses and midwives spend in the rooms of other patients during a night shift in a mixed obstetric ward)

  寺岡 歩, 齋藤 いずみ, 和泉 慎太郎, 大滝 千文, 西川 美樹, 大澤 佳代

  看護理工学会, 2022, 看護理工学会誌, 9, 96 - 107, English


• Characteristics of the nocturnal desaturation waveform pattern of SpO2 in COPD patients: an observational study.

  Asuka Yoshizaki, Tatsuya Nagano, Shintaro Izumi, Teruaki Nishiuma, Kyosuke Nakata, Masatsugu Yamamoto, Yuichiro Yasuda, Daisuke Hazama, Kanoko Umezawa, Naoko Katsurada, Motoko Tachihara, Yoshihiro Nishimura, Kazuyuki Kobayashi

  Oct. 2021, Respiratory research, 22(1) (1), 276 - 276, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Analysis of nocturnal desaturation waveforms using algorithms in patients with idiopathic pulmonary fibrosis.

  Yuichiro Yasuda, Tatsuya Nagano, Shintaro Izumi, Mina Yasuda, Kosuke Tsuruno, Kazunori Tobino, Kyosuke Nakata, Kayoko Okamura, Teruaki Nishiuma, Kiyonobu Takatsuki, Yasuhiro Funada, Hisashi Ohnishi, Masatsugu Yamamoto, Yoshihiro Nishimura, Kazuyuki Kobayashi

  Aug. 2021, Sleep & breathing = Schlaf & Atmung, 26(3) (3), 1079 - 1086, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A novel automatic cough frequency monitoring system combining a triaxial accelerometer and a stretchable strain sensor.

  Takehiro Otoshi, Tatsuya Nagano, Shintaro Izumi, Daisuke Hazama, Naoko Katsurada, Masatsugu Yamamoto, Motoko Tachihara, Kazuyuki Kobayashi, Yoshihiro Nishimura

  Objective evaluations of cough frequency are considered important for assessing the clinical state of patients with respiratory diseases. However, cough monitors with audio recordings are rarely used in clinical settings. Issues regarding privacy and background noise with audio recordings are barriers to the wide use of these monitors; to solve these problems, we developed a novel automatic cough frequency monitoring system combining a triaxial accelerator and a stretchable strain sensor. Eleven healthy adult volunteers and 10 adult patients with cough were enrolled. The participants wore two devices for 30 min for the cough measurements. An accelerator was attached to the epigastric region, and a stretchable strain sensor was worn around their neck. When the subjects coughed, these devices displayed specific waveforms. The data from all the participants were categorized into a training dataset and a test dataset. Using a variational autoencoder, a machine learning algorithm with deep learning, the components of the test dataset were automatically judged as being a "cough unit" or "non-cough unit". The sensitivity and specificity in detecting coughs were 92% and 96%, respectively. Our cough monitoring system has the potential to be widely used in clinical settings without any concerns regarding privacy or background noise.

  May 2021, Scientific reports, 11(1) (1), 9973 - 9973, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 24時間体制でハイリスクの母体救命救急に対応している産科単独の病棟における夜勤帯助産師の滞在場所と滞在時間の分析(An analysis of the locations visited by night shift midwives and the duration spent in each while providing round-the-clock critical care to high-risk mothers in a maternity ward)

  西川 美樹, 齋藤 いずみ, 大滝 千文, 大澤 佳代, 和泉 慎太郎

  看護理工学会, 2021, 看護理工学会誌, 9, 21 - 33, English


• Successful allogeneic bone marrow transplantation after massive gastrointestinal bleeding in a patient with myelodysplastic syndrome associated with intestinal Behçet-like disease.

  Arata Ishii, Shokichi Tsukamoto, Tatsuzo Mishina, Shintaro Izumi, Yurie Nagai, Miki Yamazaki, Yutaro Hino, Kensuke Kayamori, Nagisa Oshima-Hasegawa, Tomoya Muto, Shio Mitsukawa, Yusuke Takeda, Naoya Mimura, Chikako Ohwada, Chiaki Nakaseko, Jun-Ichiro Ikeda, Emiko Sakaida

  2021, Leukemia research reports, 16, 100278 - 100278, English, International magazine

  Scientific journal


• Prospective Study of Nocturnal Desaturation in Patients Receiving Home Oxygen Therapy.

  Asuka Yoshizaki, Tatsuya Nagano, Shintaro Izumi, Yasuhiro Funada, Kyosuke Nakata, Teruaki Nishiuma, Kiyonobu Takatsuki, Hisashi Ohnishi, Nobuko Hazeki, Yuichiro Yasuda, Ryota Dokuni, Masatsugu Yamamoto, Kazuyuki Kobayashi, Yoshihiro Nishimura

  2021, Internal medicine (Tokyo, Japan), 60(19) (19), 3071 - 3079, English, Domestic magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 12.5-m Distance Measurement in High-Interference Environment Using Ultrasonic Array Sensors.

  Yukiko Yoshikawa, Yuto Yasuda, Toru Ishii, Shintaro Izumi, Hiroshi Kawaguchi

  IEEE, 2021, IEEE International Instrumentation and Measurement Technology Conference(I2MTC), 38th, 1 - 6


• Subcentimeter Precision Ranging System for Moving Targets With a Doppler-Effect- Compensated Ultrasonic Direct Sequence Spread Spectrum

  ISHII Toru, Yukiko Yoshikawa, Shintaro Izumi, Hiroshi Kawaguchi

  2021, IEEE Transactions on Instrumentation and Measurement, 70, 1 - 8

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Printable Transparent Microelectrodes toward Mechanically and Visually Imperceptible Electronics

  Ashuya Takemoto, Teppei Araki, Takafumi Uemura, Yuki Noda, Shusuke Yoshimoto, Shintaro Izumi, Shuichi Tsuruta, Tsuyoshi Sekitani

  Wiley, Aug. 2020, Advanced Intelligent Systems, 2(11) (11), 2000093 - 2000093

  Scientific journal


• Heartbeat Interval Error Compensation Method for Low Sampling Rates Photoplethysmography Sensors

  Kento Watanabe, Shintaro Izumi, Yuji Yano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Jun. 2020, IEICE TRANSACTIONS ON COMMUNICATIONS, E103B(6) (6), 645 - 652, English

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A 1.15-TOPS 6.57-TOPS/W Neural Network Processor for Multi-Scale Object Detection With Reduced Convolutional Operations

  Reiya Kawamoto, Masakazu Taichi, Masaya Kabuto, Daisuke Watanabe, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi, Go Matsukawa, Toshio Goto, Motoshi Kojima

  Institute of Electrical and Electronics Engineers ({IEEE}), May 2020, IEEE Journal of Selected Topics in Signal Processing, 14(4) (4), 634 - 645

  Scientific journal


• Wireless Monitoring Using a Stretchable and Transparent Sensor Sheet Containing Metal Nanowires.

  Teppei Araki, Takafumi Uemura, Shusuke Yoshimoto, Ashuya Takemoto, Yuki Noda, Shintaro Izumi, Tsuyoshi Sekitani

  Apr. 2020, Advanced materials (Deerfield Beach, Fla.), 32(15) (15), e1902684, English, International magazine

  [Refereed]

  Scientific journal


• Doppler shift compensation technique for ultrasonic DSSS ranging system.

  Toru Ishii, Yukiko Yoshikawa, Shintaro Izumi, Hiroshi Kawaguchi

  IEEE, 2020, 2020 IEEE International Instrumentation and Measurement Technology Conference(I2MTC), 1 - 6

  International conference proceedings


• Remarkable donor-derived T cell lymphocytosis before engraftment of a bone marrow transplant for acute lymphoblastic leukemia.

  Yurie Nagai, Shokichi Tsukamoto, Yutaro Hino, Yusuke Isshiki, Miki Yamazaki, Shintaro Izumi, Tatsuzo Mishina, Nagisa Oshima-Hasegawa, Shio Mitsukawa, Yusuke Takeda, Naoya Mimura, Chikako Ohwada, Masahiro Takeuchi, Tohru Iseki, Chiaki Nakaseko, Emiko Sakaida

  Jan. 2020, Leukemia & lymphoma, 61(1) (1), 221 - 224, English, International magazine


• An Architectural Study for Inference Coprocessor Core at the Edge in IoT Sensing.

  Daisuke Watanabe, Yuji Yano, Shintaro Izumi, Hiroshi Kawaguchi, Kiyoshi Takeuchi, Toshiro Hiramoto, Shoichi Iwai, Masami Murakata, Masahiko Yoshimoto

  IEEE, 2020, 2nd IEEE International Conference on Artificial Intelligence Circuits and Systems(AICAS), 305 - 309

  [Refereed]

  International conference proceedings


• A 1.15-TOPS 6.57-TOPS/W DNN Processor for Multi-Scale Object Detection.

  Reiya Kawamoto, Masakazu Taichi, Masaya Kabuto, Daisuke Watanabe, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  IEEE, 2020, 2nd IEEE International Conference on Artificial Intelligence Circuits and Systems(AICAS), 203 - 207

  [Refereed]

  International conference proceedings


• Analysis of day shift nurses' and midwives' locations and durations using information communication equipment: A prospective observational study of a mixed obstetric ward with critical patients in Japan

  Otaki Chifumi, Saito Izumi, Izumi Shintaro, Osawa Kayo

  [Introduction] The number of mixed obstetric wards, which combine obstetric and non-obstetric patients, is increasing in Japan. The nurses and midwives working in these wards are concerned with their work process and sharing of roles. [Purpose] This study aimed to clarify how nurses and midwives work and share roles by measuring the location and duration of their work-related movements in mixed obstetric wards with critical patients. [Methods] We conducted a prospective observational study of nurses and midwives working in a mixed obstetric ward and measured times in various tasks according to a time-motion design using a smartphone and a beacon. [Results] The mean bedside time for nurses and midwives per patient in a general patient room did not differ significantly between days with and without critical patients in the ward (p=0.092). When critical patients were hospitalized, the nurses and midwives spent less time at the nurses' station. [Conclusion] Nurses' stay time per patient in general rooms was stable regardless of admission of critical patients. This staffing, which defined the role of nurses and midwives working in a mixed obstetric ward, secured nursing time for critical, general, and obstetric patients despite the mixed ward.

  The Society for Nursing Science and Engineering, 2020, Journal of Nursing Science and Engineering, 7(0) (0), 130 - 140, English

  [Refereed]


• Low-Noise Photoplethysmography Sensor Using Correlated Double Sampling for Heartbeat Interval Acquisition

  Kento Watanabe, Shintaro Izumi, Kana Sasai, Yuji Yano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Dec. 2019, IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, 13(6) (6), 1552 - 1562, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Low-Power Photoplethysmography Sensor using Correlated Double Sampling and Reference Readout Circuit

  Kana Sasai, Shintaro Izumi, Kento Watanabe, Yuji Yano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Institute of Electrical and Electronics Engineers Inc., Oct. 2019, Proceedings of IEEE Sensors, 2019-, English

  International conference proceedings


• Energy-Efficient Spectral Analysis Method Using Autoregressive Model-Based Approach for Internet of Things

  Seiya Yoshida, Shintaro Izumi, Koichi Kajihara, Yuji Yano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Oct. 2019, IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 66(10) (10), 3896 - 3905, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Classification Algorithm for Nocturnal Hypoxemia Using Nocturnal Pulse Oximetry.

  Shintaro Izumi, Tatsuya Nagano, Asuka Yoshizaki, Yoshihiro Nishimura

  This paper describes an automatic classification algorithm for nocturnal hypoxemia in patients receiving home oxygen therapy (HOT). Nocturnal hypoxemia is a well-known complication in patients with chronic respiratory disease, and the number of patients receiving HOT has increased in recent years. Many studies have reported that 40% of patients receiving HOT have sleep-related oxygen desaturation. To deal with this situation, a nocturnal pulse oximetry is used to measure oxygen saturation (SpO2) and control the flow rate of highly concentrated oxygen. However, in some cases, the flow rate is not controlled properly and the same flow rate is adopted both during the day and night. There are several types of nocturnal hypoxemia, and it is difficult to classify these types only according to a subjective assessment of a medical doctor. Furthermore, it is difficult to continuously monitor the measurement results of pulse oximetry, although a flexible treatment depending on the state of hypoxemia is desired. To overcome these difficulties, an automatic classification method for SpO2 measured by the nocturnal pulse oximetry is proposed in this paper. The proposed method uses the time domain waveform and the frequency characteristics of SpO2. The classification performance of the method is evaluated by using 48 measured SpO2 values from patients receiving the HOT. The classification results are validated with decisions of ten chest physicians.

  IEEE, Jul. 2019, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2019, 3662 - 3665, English, International magazine

  [Refereed]

  Scientific journal


• Recent Progress of Biomedical Processor SoC for Wearable Healthcare Application: A Review

  Masahiko Yoshimoto, Shintaro Izumi

  Apr. 2019, IEICE TRANSACTIONS ON ELECTRONICS, E102C(4) (4), 245 - 259, English

  [Refereed]

  Scientific journal


• A 28-nm FD-SOI 8T Dual-Port SRAM for Low-Energy Image Processor With Selective Sourceline Drive Scheme

  Haruki Mori, Tomoki Nakagawa, Yuki Kitahara, Yuta Kawamoto, Kenta Takagi, Shusuke Yoshimoto, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Apr. 2019, IEEE Transactions on Circuits and Systems I: Regular Papers, 66(4) (4), 1442 - 1453, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• An IoT Sensor Node SoC with Dynamic Power Scheduling for Sustainable Operation in Energy Harvesting Environment.

  Yuji Yano, Seiya Yoshida, Shintaro Izumi, Hiroshi Kawaguchi, Tetsuya Hirose, Masaya Miyahara, Teruki Someya, Kenichi Okada, Ippei Akita, Yoshihiko Kurui, Hideyuki Tomizawa, Masahiko Yoshimoto

  IEEE, 2019, IEEE Asian Solid-State Circuits Conference(A-SSCC), 267 - 270

  [Refereed]

  International conference proceedings


• A Heartbeat Interval Error Compensation Method Using Multiple Linear Regression for Photoplethysmography Sensors

  Seiya Yoshida, Shintaro Izumi, Yuki Nishikawa, Kento Watanabe, Kana Sasai, Yuji Yano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2019, 2019 IEEE BIOMEDICAL CIRCUITS AND SYSTEMS CONFERENCE (BIOCAS 2019), 1 - 4, English

  [Refereed]

  International conference proceedings


• Non-contact Laser Printing of Ag Nanowire-based Electrode with Photodegradable Polymers

  Araki, Teppei, den Toonder, Jaap M. J., Suganuma, Katsuaki, Uemura, Takafumi, Noda, Yuki, Yoshimoto, Shusuke, Izumi, Shintaro, Sekitani, Tsuyoshi

  2019, JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY, 32(3) (3), 429 - 434, English

  [Refereed]

  Scientific journal


• Noise Evaluation System for Biosignal Sensors Using Pseudo-Skin and Helmholtz Coil.

  Misaki Inaoka, Shintaro Izumi, Shusuke Yoshimoto, Toshikazu Nezu, Yuki Noda, Teppei Araki, Takafumi Uemura, Tsuyoshi Sekitani

  2019, 2019 13TH INTERNATIONAL SYMPOSIUM ON MEDICAL INFORMATION AND COMMUNICATION TECHNOLOGY (ISMICT), 1 - 4, English

  [Refereed]

  International conference proceedings


• Non-Contact Instantaneous Heart Rate Extraction System Using 24-GHz Microwave Doppler Sensor.

  Shintaro Izumi, Takaaki Okano, Daichi Matsunaga, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2019, IEICE Trans. Commun., 102-B(6) (6), 1088 - 1096, English

  [Refereed]

  Scientific journal


• Adaptive Learning Rate Adjustment with Short-Term Pre-Training in Data-Parallel Deep Learning

  YAMADA Kazuki, MORI Haruki, YOUKAWA Tetsuya, MIYAUCHI Yuki, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi

  2019, Proceedings of the Annual Conference of JSAI, 2019(0) (0), 2H3J202 - 2H3J202, Japanese


• Sampling Rate Reduction for Wearable Heart Rate Variability Monitoring

  西河有貴, 和泉慎太郎, 矢野祐二, 川口博, 吉本雅彦

  Oct. 2018, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 35, 5p - 5, Japanese


• Estimating metabolic equivalents for activities in daily life using acceleration and heart rate in wearable devices.

  Motofumi Nakanishi, Shintaro Izumi, Sho Nagayoshi, Hiroshi Kawaguchi, Masahiko Yoshimoto, Toshikazu Shiga, Takafumi Ando, Satoshi Nakae, Chiyoko Usui, Tomoko Aoyama, Shigeho Tanaka

  Jul. 2018, Biomedical engineering online, 17(1) (1), 100 - 100, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A 5-ms Error, 22-μA Photoplethysmography Sensor using Current Integration Circuit and Correlated Double Sampling.

  Kento Watanabe, Shintaro Izumi, Yuji Yano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  This paper presents a low-power Photoplethysmography (PPG) sensing method. The PPG is commonly used in recent wearable devices to detect cardiovascular information including heartbeat. The heartbeat is useful for physical activity and stress monitoring. However, the PPG circuit consumes large power because it consists of LED and photodiode. To reduce its power consumption without accuracy degradation, a cooperative design of circuits and algorithms is proposed in this work. A straightforward way to reduce the power is intermittent driving of LED, but there is a disadvantage that the signal is contaminated by a noise while circuit switching. To overcome this problem, we introduce correlated double sampling (CDS) method, which samples an integration circuit output twice with short intervals after the LED turns on and uses the difference of these voltage. Furthermore, an up-conversion method using linear interpolation, and an error correction using autocorrelation are introduced. The proposed PPG sensor, which consists of the LED, the photodiode, the current integration circuit, a CMOS switch, an A/D converter, and an MCU, is prototyped. It is evaluated by actual measurement with 22-year-old subject. The measurement results show that 22-μA total current consumption is achieved with 5-ms mean absolute error.

  Jul. 2018, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2018, 5566 - 5569, English, International magazine

  [Refereed]

  Scientific journal


• マイクロ波ドップラーセンサを用いた非接触生体認証

  OKANO Takaaki, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  電子情報通信学会, Mar. 2018, 信学技報, vol. 117, no. 511, MICT2017-54, pp. 17-20, 2018年3月, 117(511) (511), 17 - 20, Japanese


• [MALT lymphoma accompanied by elevated serum IgM levels mimicking Waldenström's macroglobulinemia].

  Shintaro Izumi, Kenji Kimura, Yusuke Takeda, Shokichi Tsukamoto, Miki Yamazaki, Tatsuzo Mishina, Yurie Nagai, Koji Takaishi, Yuhei Nagao, Nagisa Oshima-Hasegawa, Shio Mitsukawa, Naoya Mimura, Masahiro Takeuchi, Chikako Ohwada, Tohru Iseki, Satoshi Ota, Chiaki Nakaseko, Emiko Sakaida

  A 60-year-old man with chronic hepatitis C was referred to our hospital with significantly elevated total protein and serum IgM (9,500 mg/dl) levels identified via a routine checkup. Blood examination revealed increased serum IgM-monoclonal protein and serum-soluble IL-2 receptor (sIL2R) levels. Computed tomography and fluorodeoxyglucose positron emission tomography revealed pulmonary masses, abnormal soft tissue masses surrounding the bilateral kidneys, and thickened mucous membrane of the bladder with high fluorodeoxyglucose uptake. Pathological examination of the pulmonary mass revealed infiltration of medium-sized lymphocytes and plasma cells. Immunohistochemical analysis revealed tumor cells positive for CD138 and IgM, with a low positive rate of Ki-67 expression. Notably, the tumor cell-surrounding lymphocytes were positive for CD20. Although the patient was initially regarded as having Waldenström's macroglobulinemia owing to the significantly increased serum IgM levels, based on positive IgH-MALT1 translocation and negative MYD88 L265P mutation findings, he was further diagnosed with extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma). Complete remission was achieved following six cycles of rituximab + CHOP therapy. This study data suggest that analysis of the MYD88 L265P mutation in tumor cells is suitable for accurately diagnosing hematopoietic malignancies with increased IgM monoclonal protein.

  2018, [Rinsho ketsueki] The Japanese journal of clinical hematology, 59(12) (12), 2600 - 2605, Japanese, Domestic magazine

  Scientific journal


• A low power, VLSI object recognition processor using Sparse FIND feature for 60 fps HDTV resolution video [IEICE Electronics Express Vol. 14(2017) No. 15 pp. 20170668].

  Go Matsukawa, Taisuke Kodama, Yuri Nishizumi, Koichi Kajihara, Chikako Nakanishi, Shintaro Izumi, Hiroshi Kawaguchi, Toshio Goto, Takeo Kato, Masahiko Yoshimoto

  2018, IEICE Electron. Express, 15(12) (12), 20188003 - 20188003, English

  [Refereed]

  Scientific journal


• A 11.3-µA Physical Activity Monitoring System Using Acceleration and Heart Rate.

  Motofumi Nakanishi, Shintaro Izumi, Mio Tsukahara, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Masahiko Yoshimoto

  2018, IEICE Trans. Electron., 101-C(4) (4), 233 - 242, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Hardware Implementation of Autoregressive Model Estimation Using Burg's Method for Low-Energy Spectral Analysis.

  Koichi Kajihara, Shintaro Izumi, Seiya Yoshida, Yuji Yano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2018, PROCEEDINGS OF THE 2018 IEEE INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING SYSTEMS (SIPS), 199 - 204, English

  [Refereed]

  International conference proceedings


• DELAYED WEIGHT UPDATE FOR FASTER CONVERGENCE IN DATA-PARALLEL DEEP LEARNING

  Tetsuya Youkawa, Haruki Mori, Yuki Miyauchi, Kazuki Yamada, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2018, 2018 IEEE GLOBAL CONFERENCE ON SIGNAL AND INFORMATION PROCESSING (GLOBALSIP 2018), 663 - 667, English

  [Refereed]

  International conference proceedings


• Layer Skip Learning using LARS variables for 39% Faster Conversion Time and Lower Bandwidth

  Miyauchi, Yuki, Mori, Haruki, Youkawa, Tetsuya, Yamada, Kazuki, Izumi, Shintaro, Yoshimoto, Masahiko, Kawaguchi, Hiroshi, Inoue, Atsuki

  2018, 2018 25TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS (ICECS), 673 - 676, English

  [Refereed]

  International conference proceedings


• 28-nm FD-SOI Dual-Port SRAM with MSB-Based Inversion Logic for Low-Power Deep Learning.

  Haruki Mori, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2018, 2018 25TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS (ICECS), 161 - 164, English

  [Refereed]

  International conference proceedings


• Multimodal Cardiovascular Information Monitor using Piezoelectric Transducers

  Takaaki Okano, Shintaro Izumi, Takumi Katsuura, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Oct. 2017, J. Signal Process. Syst., 34(9) (9), 1 - 6, Japanese

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Multimodal Cardiovascular Information Monitor using Piezoelectric Transducers

  Takaaki Okano, Shintaro Izumi, Takumi Katsuura, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Oct. 2017, J. Signal Process. Syst., 34(9) (9), 1 - 6, Japanese

  Link to Kobe Univ. Repository (Kernel)


• Non-Contact Biometric Identification and Authentication Using Microwave Doppler Sensor

  OKANO Takaaki, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Oct. 2017, The 13th IEEE BioMedical Circuits and Systems Conference(BioCAS), pp.392-395, Oct. 2017., 392 - 395, English

  [Refereed]

  International conference proceedings


• A swallowable sensing device platform with wireless power feeding and chemical reaction actuator.

  Ryota Nakamura, Shintaro Izumi, Hiroshi Kawaguchi, Hidetoshi Ohta, Masahiko Yoshimoto

  Jul. 2017, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2017, 3040 - 3043, English, International magazine

  [Refereed]

  Scientific journal


• A contact-less heart rate sensor system for driver health monitoring

  IZUMI Shintaro, MATSUNAGA Daichi, NAKAMURA Ryota, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Jul. 2017, The 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC’17), July. 2017, English

  International conference proceedings


• A Novel Test Scheme for Detecting Faulty Recall Margin Cells for6T-4C FeRAM,

  UMEKI Yohei, IZUMI Shintaro, KITAHARA Hiroto, NAKAGAWA Tomoki, YANAGIDA Kouji, YOSHIMOTO Shusuke, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko, KIMURA Hiromitsu, MARUMOTO Kyoji, FUCHIKAMI Takaaki, FUJIMORI Yoshikazu

  神戸大学大学院工学研究科, Feb. 2017, Memoirs of the Graduate Schools of Engineering and SystemInformatics Kobe University, no. 8, pp. 5-8, Feb. 2017., 8, English

  [Refereed]

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Research and development of normally-off computing–nedo project

  Takashi Nakada, Shinobu Fujita, Masanori Hayashikoshi, Shintaro Izumi, Yoshikazu Fujimori, Hiroshi Nakamura

  Springer Japan, Jan. 2017, Normally-Off Computing, 103 - 127, English

  [Refereed]

  In book


• A low power, VLSI object recognition processor using Sparse FIND feature for 60 fps HDTV resolution video.

  Go Matsukawa, Taisuke Kodama, Yuri Nishizumi, Koichi Kajihara, Chikako Nakanishi, Shintaro Izumi, Hiroshi Kawaguchi, Toshio Goto, Takeo Kato, Masahiko Yoshimoto

  2017, IEICE Electronic Express, 14(15) (15), 20170668 - 20170668, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A 19-mu A Metabolic Equivalents Monitoring SoC using Adaptive Sampling

  Mio Tsukahara, Shintaro Izumi, Motofumi Nakanashi, Hiroshi Kawaguchi, Masahiko Yoshimoto, Hiromitsu Kimura, Kyoji Maromoto, Takaaki Fuchikami, Yoshikazu Fujimori

  2017, 2017 22ND ASIA AND SOUTH PACIFIC DESIGN AUTOMATION CONFERENCE (ASP-DAC), 37 - 38, English

  [Refereed]

  International conference proceedings


• A LAYER-BLOCK-WISE PIPELINE FOR MEMORY AND BANDWIDTH REDUCTION IN DISTRIBUTED DEEP LEARNING

  Mori, Haruki, Youkawa, Tetsuya, Izumi, Shintaro, Yoshimoto, Masahiko, Kawaguchi, Hiroshi, Inoue, Atsuki

  2017, 2017 IEEE 27TH INTERNATIONAL WORKSHOP ON MACHINE LEARNING FOR SIGNAL PROCESSING, English

  [Refereed]

  International conference proceedings


• Wearable pulse wave velocity sensor using flexible piezoelectric film array.

  Takumi Katsuura, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi, Shusuke Yoshimoto, Tsuyoshi Sekitani

  IEEE, 2017, Proc. of IEEE Biomedical Circuits and Systems Conference (BioCAS), pp. 721–724, Oct. 2017, 1 - 4, English

  [Refereed]

  International conference proceedings


• FPGA Implementation of Object Recognition Processor for HDTV Resolution Video Using Sparse FIND Feature

  Nishizumi, Yuri, Matsukawa, Go, Kajihara, Koichi, Kodama, Taisuke, Izumi, Shintaro, Kawaguchi, Hiroshi, Nakanishi, Chikako, Goto, Toshio, Kato, Takeo, Yoshimoto, Masahiko

  2017, 2017 IEEE INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING SYSTEMS (SIPS), English

  [Refereed]

  International conference proceedings


• Capacitively coupled ECG sensor system with digitally assisted noise cancellation for wearable application.

  Yuki Nagasato, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  IEEE, 2017, The 13th IEEE BioMedical Circuits and Systems Conference(BioCAS), pp.400-403, Oct. 2017., 1 - 4, English

  [Refereed]

  International conference proceedings


• A METABOLIC EQUIVALENTS ESTIMATION ALGORITHM USING TRIAXIAL ACCELEROMETER AND ADAPTIVE SAMPLING FOR WEARABLE DEVICES

  Nakanishi, Motofumi, Izumi, Shintaro, Tsukahara, Mio, Kawaguchi, Hiroshi, Yoshimoto, Masahiko

  2017, 2017 IEEE LIFE SCIENCES CONFERENCE (LSC), 107 - 110, English

  [Refereed]

  International conference proceedings


• 産科を含む混合病棟における看護者の動線解析

  齋藤 いずみ, 和泉 慎太郎, 大滝 千文

  (公社)日本新生児成育医学会, Nov. 2016, 日本新生児成育医学会雑誌, 28(3) (3), 736 - 736, Japanese


• 産科を含む混合病棟における情報通信技術を活用した看護可視化システムの検討

  和泉 慎太郎, 大滝 千文, 齋藤 いずみ

  (公社)日本新生児成育医学会, Nov. 2016, 日本新生児成育医学会雑誌, 28(3) (3), 737 - 737, Japanese


• 消化管内へ留置する飲み込型センサの検討

  NAKAMURA Ryota, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko, OHTA Hidetoshi

  Sep. 2016, 電気学会C部門大会, 2016年9月1日，神戸, 2016, Japanese


• 加速度センサを用いた低消費電力運動強度推定アルゴリズム

  TSUKAHARA Mio, NAKANISHI Motofumi, IZUMI Shintaro, NAKAI Yozaburo, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Sep. 2016, 電気学会C部門大会, 2016年9月1日，神戸., 2016, Japanese


• 加速度センサを用いた低消費電力運動強度推定アルゴリズム

  TSUKAHARA Mio, NAKANISHI Motofumi, IZUMI Shintaro, NAKAI Yozaburo, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Sep. 2016, IEICEソサイエティ大会, 2016年9月21日，札幌, 2016, Japanese

  Symposium


• Swallowable sensing device for long-term gastrointestinal tract monitoring.

  Ryota Nakamura, Shintaro Izumi, Hiroshi Kawaguchi, Hidetoshi Ohta, Masahiko Yoshimoto

  Aug. 2016, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2016, 3039 - 3042, English, International magazine

  [Refereed]

  Scientific journal


• A 28-nm 484-fJ/writecycle 650-fJ/readcycle 8T Three-Port FD-SOI SRAM for Image Processor

  Haruki Mori, Yohei Umeki, Shusuke Yoshimoto, Shintaro Izumi, Koji Nii, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Aug. 2016, IEICE TRANSACTIONS ON ELECTRONICS, E99C(8) (8), 901 - 908, English

  [Refereed]

  Scientific journal


• Error Propagation Analysis for Single Event Upset considering Masking Effects on Re-Convergent Path

  Go Matsukawa, Yuta Kimi, Shuhei Yoshida, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Jun. 2016, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E99A(6) (6), 1198 - 1205, English

  [Refereed]

  Scientific journal


• 298-fJ/writecycle 650-fJ/readcycle を実現する画像処理プロセッサ向け 28-nm FD-SOI 8T 3ポートSRAM

  MORI Haruki, NAKAGAWA Tomoki, KITAHARA Yuki, KAWAMOTO Yuta, TAKAGI Kenta, YOSHIMOTO Shusuke, IZUMI Shintaro, NII Koji, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  電子情報通信学会, Apr. 2016, 信学技報, vol.116, no.3, pp.13-16, 2016年4月14日，東京., 116(3) (3), 13 - 16, Japanese


• Process variation tolerant counter base read circuit for low-voltage operating STT-MRAM

  UMEKI Yohei, YANAGIDA Kouji, KUROTSU Hiroaki, KITAHARA Hiroto, MORI Haruki, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi, YOSHIMOTO Shusuke, TSUNODA Koji, SUGII Toshihiro

  Mar. 2016, DATE EMS Workshop, Mar. 2016, English

  [Refereed]

  International conference proceedings


• Capacitively Coupled ECG Sensor using a Single Electrode with Adaptive Power-Line Noise Cancellation

  Yuta Kawamoto, Shintaro Izumi, Yoshito Tanaka, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2016, 2016 3RD IEEE EMBS INTERNATIONAL CONFERENCE ON BIOMEDICAL AND HEALTH INFORMATICS, 212 - 215, English

  [Refereed]

  International conference proceedings


• An Soft Error Propagation Analysis Considering Logical Masking Effect on Re-convergent Path

  Shuhei Yoshida, Go Matsukawa, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2016, 2016 IEEE 22ND INTERNATIONAL SYMPOSIUM ON ON-LINE TESTING AND ROBUST SYSTEM DESIGN (IOLTS), 13 - 16, English

  [Refereed]

  International conference proceedings


• Low-power metabolic equivalents estimation algorithm using adaptive acceleration sampling

  Mio Tsukahara, Motofumi Nakanishi, Shintaro Izumi, Yozaburo Nakai, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2016, 2016 38TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 2016, 1878 - 1881, English, International magazine

  [Refereed]

  International conference proceedings


• A counter-based read circuit tolerant to process variation for 0.4-V operating STT-MRAM

  Yohei Umeki, Koji Yanagida, Shusuke Yoshimoto, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi, Koji Tsunoda, Toshihiro Sugii

  Information Processing Society of Japan, 2016, IPSJ Transactions on System LSI Design Methodology, 9, 79 - 83, English

  [Refereed]

  Scientific journal


• Adaptive Noise Cancellation Method for Capacitively Coupled ECG Sensor using Single Insulated Electrode

  Yoshito Tanaka, Shintaro Izumi, Yuta Kawamoto, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2016, PROCEEDINGS OF 2016 IEEE BIOMEDICAL CIRCUITS AND SYSTEMS CONFERENCE (BIOCAS), 296 - 299, English

  [Refereed]

  International conference proceedings


• Non-Contact Instantaneous Heart Rate Monitoring using Microwave Doppler Sensor and Time-Frequency Domain Analysis

  Daichi Matsunaga, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2016, 2016 IEEE 16TH INTERNATIONAL CONFERENCE ON BIOINFORMATICS AND BIOENGINEERING (BIBE), 172 - 175, English

  [Refereed]

  International conference proceedings


• An Low-Energy 8T Dual-Port SRAM for Image Processor with Selective Sourceline Drive Scheme in 28-nm FD-SOI Process Technology

  Haruki Mori, Tomoki Nakagawa, Yuki Kitahara, Yuta Kawamoto, Kenta Takagi, Shusuke Yoshimoto, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2016, 23RD IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS CIRCUITS AND SYSTEMS (ICECS 2016), 532 - 535, English

  [Refereed]

  International conference proceedings


• A 15-mu A Metabolic Equivalents Monitoring System using Adaptive Acceleration Sampling and Normally Off Computing

  Mio Tsukahara, Shintaro Izumi, Motofumi Nakanishi, Hiroshi Kawaguchi, Masahiko Yoshimoto, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori

  2016, 23RD IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS CIRCUITS AND SYSTEMS (ICECS 2016), 61 - 64, English

  [Refereed]

  International conference proceedings


• A Fast Settling All Digital PLL Using Temperature Compensated Oscillator Tuning Word Estimation Algorithm

  Keisuke Okuno, Shintaro Izumi, Kana Masaki, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Dec. 2015, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E98A(12) (12), 2592 - 2599, English

  [Refereed]

  Scientific journal


• Normally Off ECG SoC With Non-Volatile MCU and Noise Tolerant Heartbeat Detector.

  Shintaro Izumi, Ken Yamashita, Masanao Nakano, Shusuke Yoshimoto, Tomoki Nakagawa, Yozaburo Nakai, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Hiroshi Nakajima, Toshikazu Shiga, Masahiko Yoshimoto

  Oct. 2015, IEEE transactions on biomedical circuits and systems, 9(5) (5), 641 - 51, English, International magazine

  [Refereed]

  Scientific journal


• A Wearable Healthcare System With a 13.7 μA Noise Tolerant ECG Processor.

  Shintaro Izumi, Ken Yamashita, Masanao Nakano, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Hiroshi Nakajima, Toshikazu Shiga, Masahiko Yoshimoto

  Oct. 2015, IEEE transactions on biomedical circuits and systems, 9(5) (5), 733 - 42, English, International magazine

  [Refereed]

  Scientific journal


• Physical activity group classification algorithm using triaxial acceleration and heart rate.

  Motofumi Nakanishi, Shintaro Izumi, Sho Nagayoshi, Hironori Sato, Hiroshi Kawaguchi, Masahiko Yoshimoto, Takafumi Ando, Satoshi Nakae, Chiyoko Usui, Tomoko Aoyama, Shigeho Tanaka

  Aug. 2015, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2015, 510 - 3, English, International magazine

  [Refereed]

  Scientific journal


• Large displacement haptic stimulus actuator using piezoelectric pump for wearable devices.

  Taisuke Kodama, Shintaro Izumi, Kana Masaki, Hiroshi Kawaguchi, Kazusuke Maenaka, Masahiko Yoshimoto

  Aug. 2015, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2015, 1172 - 5, English, International magazine

  [Refereed]

  Scientific journal


• A low power 6T-4C non-volatile memory using charge sharing and non-precharge techniques

  Tomoki Nakagawa, Shintaro Izumi, Koji Yanagida, Yuki Kitahara, Shusuke Yoshimoto, Yohei Umeki, Haruki Mori, Hiroto Kitahara, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Masahiko Yoshimoto

  Institute of Electrical and Electronics Engineers Inc., Jul. 2015, Proceedings - IEEE International Symposium on Circuits and Systems, 2015-, 2904 - 2907, English

  [Refereed]

  International conference proceedings


• Low-Jitter Design for Second-Order Time-to-Digital Converter Using Frequency Shift Oscillators

  Keisuke Okuno, Toshihiro Konishi, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Jul. 2015, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E98A(7) (7), 1475 - 1481, English

  [Refereed]

  Scientific journal


• An I/O-Sized ADC with Second-Order TDC and MOM Capacitor Voltage-to-Time Converter

  Keisuke Okuno, Toshihiro Konishi, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Jun. 2015, IEICE TRANSACTIONS ON ELECTRONICS, E98C(6) (6), 489 - 495, English

  [Refereed]

  Scientific journal


• Noise Tolerant Heart Rate Extraction Algorithm Using Short-Term Autocorrelation for Wearable Healthcare Systems

  Shintaro Izumi, Masanao Nakano, Ken Yamashita, Yozaburo Nakai, Hiroshi Kawaguchi, Masahiko Yoshimoto

  May 2015, IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, E98D(5) (5), 1095 - 1103, English

  [Refereed]

  Scientific journal


• A 298-fJ/writecycle 650-fJ/readcycle 8T Three-Port SRAM in 28-nm FD-SOI Process Technology for Image Processor

  Haruki Mori, T. Nakagawa, Y. Kitahara, Y. Kawamoto, K. Takagi, S. Yoshimoto, S. Izumi, K. Nii, H. Kawaguchi, M. Yoshimoto

  2015, 2015 IEEE CUSTOM INTEGRATED CIRCUITS CONFERENCE (CICC), English

  [Refereed]

  International conference proceedings


• Analysis of Soft Error Propagation considering Masking Effects on Re-convergent Path

  Yuta Kimi, Go Matsukawa, Shuhei Yoshida, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2015, 2015 IEEE 24TH ASIAN TEST SYMPOSIUM (ATS), 139 - 144, English

  [Refereed]

  International conference proceedings


• A Negative-Resistance Sense Amplifier for Low-Voltage Operating STT-MRAM

  Yohei Umeki, Koji Yanagida, Shusuke Yoshimoto, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi, Koji Tsunoda, Toshihiro Sugii

  Jan. 2015, IEEE Asia and South Pacific Design Automation Conference (ASP-DAC) University LSI Design Contest, pp. 8 - 9, English

  [Refereed]

  International conference proceedings


• A 14 mu A ECG Processor with Noise Tolerant Heart Rate Extractor and FeRAM for Wearable Healthcare Systems

  Yozaburo Nakai, Shintaro Izumi, Ken Yamashita, Masanao Nakano, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2015, 2015 20TH ASIA AND SOUTH PACIFIC DESIGN AUTOMATION CONFERENCE (ASP-DAC), 16 - 17, English

  [Refereed]

  International conference proceedings


• A Low Power 6T-4C Non-volatile Memory using Charge Sharing and Non-precharge Techniques

  Tomoki Nakagawa, Shintaro Izumi, Koji Yanagida, Yuki Kitahara, Shusuke Yoshimoto, Yohei Umeki, Haruki Mori, Hiroto Kitahara, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Masahiko Yoshimoto

  2015, 2015 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), 2904 - 2907, English

  [Refereed]

  International conference proceedings


• An Accurate Soft Error Propagation Analysis Technique Considering Temporal Masking Disablement

  Yuta Kimi, Go Matsukawa, Shuhei Yoshida, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2015, 2015 IEEE 21ST INTERNATIONAL ON-LINE TESTING SYMPOSIUM (IOLTS), 23 - 25, English

  [Refereed]

  International conference proceedings


• Non-contact and noise tolerant heart rate monitoring using microwave doppler sensor and range imagery.

  Daichi Matsunag, Shintaro Izumi, Keisuke Okuno, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2015, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2015, 6118 - 21, English, International magazine

  [Refereed]

  Scientific journal


• A more acceptable endoluminal implantation for remotely monitoring ingestible sensors anchored to the stomach wall.

  Hidetoshi Ohta, Shintaro Izumi, Masahiko Yoshimoto

  2015, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2015, 4089 - 92, English, International magazine

  [Refereed]

  Scientific journal


• A Ferroelectric-Based Non-Volatile Flip-Flop for Wearable Healthcare Systems

  Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto, Hiromitsu Kimura, Takaaki Fuchikami, Kyoji Marumoto, Yoshikazu Fujimori

  2015, 2015 15TH NON-VOLATILE MEMORY TECHNOLOGY SYMPOSIUM (NVMTS), pp.1 - 4, English

  [Refereed]

  International conference proceedings


• 不揮発マイコンを用いたノーマリーオフ生体計測SoC

  松永 大地, 中井 陽三郎, 河本 優太, 中川 知己, 奥野 圭祐, IZUMI SHINTARO, KAWAGUCHI HIROSHI, YOSHIMOTO MASAHIKO

  Dec. 2014, 信学技報, vol. 114(no. 345) (no. 345), p. 49, Japanese

  Research society


• ウェアラブル生体センサのための心電計測方法

  田中 義人, 河本 優太, 中井 陽三郎, 奥野 圭祐, IZUMI SHINTARO, KAWAGUCHI HIROSHI, YOSHIMOTO MASAHIKO

  Dec. 2014, 信学技報, vol. 114(no. 345) (no. 345), p. 47, Japanese

  Research society


• STT-MRAM Operating at 0.38 V Using Negative-Resistance Sense Amplifier

  Yohei Umeki, Koji Yanagida, Shusuke Yoshimoto, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi, Koji Tsunoda, Toshihiro Sugii

  Dec. 2014, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E97A(12) (12), 2411 - 2417, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Real-time Scalable Object Detection System using Low-power HOG Accelerator VLSI

  Kenta Takagi, Kotaro Tanaka, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Sep. 2014, JOURNAL OF SIGNAL PROCESSING SYSTEMS FOR SIGNAL IMAGE AND VIDEO TECHNOLOGY, 76(3) (3), 261 - 274, English

  [Refereed]

  Scientific journal


• Low-Power SRAM in 28-nm FD-SOI for Image Processor

  KAWAMOTO Yuta, YOSHIMOTO Shusuke, NAKAGAWA Tomomki, KITAHARA Yuki, MORI Haruki, TAKAGI Kenta, IZUMI Shintaro, NII Koji, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  The Institute of Electronics, Information and Communication Engineers, Jan. 2014, Technical report of IEICE. ICD, 113(419) (419), 41 - 41, Japanese


• A 6T-4C shadow memory using plate line and word line boosting

  Tomoki Nakagawa, Shintaro Izumi, Shusuke Yoshimoto, Koji Yanagida, Yuki Kitahara, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Institute of Electrical and Electronics Engineers Inc., 2014, Proceedings - IEEE International Symposium on Circuits and Systems, 2736 - 2739, English

  [Refereed]

  International conference proceedings


• 磁性変化型メモリの書き込み速度を改善するメモリアーキテクチャ

  MORI Haruki, YANAGIDA Kouji, UMEKI Youhei, YOSHIMOTO Shusuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko, 角田 浩司, 杉井 寿博

  Jan. 2014, 信学技報, vol. 113(no. 419) (no. 419), p. 27, Japanese

  Research society


• 強誘電体メモリの高速回路技術

  NAKAGAWA Tomoki, YOSHIMOTO Shusuke, KITAHARA Yuki, YANAGIDA Kouji, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Jan. 2014, 信学技報, vol. 113(no. 419) (no. 419), p. 39, Japanese

  Research society


• A 54-mw 3x-real-time 60-kword continuous speech recognition processor VLSI

  Guangji He, Yuki Miyamoto, Kumpei Matsuda, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2014, IEICE ELECTRONICS EXPRESS, 11(2) (2), pp. 1 - 9, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Normally-Off Technologies for Healthcare Appliance

  Izumi, Shintaro, Kawaguchi, Hiroshi, Yoshimoto, Masahiko, Fujimori, Yoshikazu

  2014, 2014 19TH ASIA AND SOUTH PACIFIC DESIGN AUTOMATION CONFERENCE (ASP-DAC), 17 - 20, English

  [Refereed]

  International conference proceedings


• A 6T-4C Shadow Memory using Plate Line and Word Line Boosting

  Nakagawa, Tomoki, Izumi, Shintaro, Yoshimoto, Shusuke, Yanagida, Koji, Kitahara, Yuki, Kawaguchi, Hiroshi, Yoshimoto, Masahiko

  2014, 2014 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), 2736 - 2739, English

  [Refereed]

  International conference proceedings


• Noise tolerant QRS detection using template matching with short-term autocorrelation.

  Yozaburo Nakai, Shintaro Izumi, Masanao Nakano, Ken Yamashita, Takahide Fujii, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2014, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2014, 34 - 7, English, International magazine

  [Refereed]

  Scientific journal


• A 6.14 mu A Normally-Off ECG-SoC with Noise Tolerant Heart Rate Extractor for Wearable Healthcare Systems

  Shintaro Izumi, Ken Yamashita, Masanao Nakano, Tomoki Nakagawa, Yuki Kitahara, Koji Yanagida, Shusuke Yoshimoto, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Hiroshi Nakajima, Toshikazu Shiga, Masahiko Yoshimoto

  2014, 2014 IEEE BIOMEDICAL CIRCUITS AND SYSTEMS CONFERENCE (BIOCAS), 280 - 283, English

  [Refereed]

  International conference proceedings


• A 2.4 pJ Ferroelectric-Based Non-Volatile Flip-Flop with 10-Year Data Retention Capability

  Kimura, Hiromitsu, Fuchikami, Takaaki, Marumoto, Kyoji, Fujimori, Yoshikazu, Izumi, Shintaro, Kawaguchi, Hiroshi, Yoshimoto, Masahiko

  2014, 2014 IEEE ASIAN SOLID-STATE CIRCUITS CONFERENCE (A-SSCC), 21 - 24, English

  [Refereed]

  International conference proceedings


• An 8-bit I/O-Sized ADC with Second-Order TDC and MOM Capacitor Voltage-to-Time Converter

  Okuno, Keisuke, Konishi, Toshihiro, Izumi, Shintaro, Yoshimoto, Masahiko, Kawaguchi, Hiroshi

  2014, 2014 21ST IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS (ICECS), 223 - 226, English

  [Refereed]

  International conference proceedings


• A 2.23 ps RMS Jitter 3 mu s Fast Settling ADPLL using Temperature Compensation PLL Controller

  Okuno, Keisuke, Masaki, Kana, Izumi, Shintaro, Konishi, Toshihiro, Kawaguchi, Hiroshi, Yoshimoto, Masahiko

  2014, 2014 21ST IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS (ICECS), 68 - 71, English

  [Refereed]

  International conference proceedings


• A 2.4x-Real-Time VLSI Processor for 60-kWord Continuous Speech Recognition

  HE Guangji, MIYAMOTO Yuki, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  This paper describes a low-power VLSI chip for speaker-independent 60-kWord continuous speech recognition based on a context-dependent Hidden Markov Model (HMM). We implement parallel and pipelined architecture for GMM computation and Viterbi processing. It includes a 8-path Viterbi transition architecture to maximize the processing speed and adopts tri-gram language model to improve the recognition accuracy. A two-level cache architecture is implemented for the demo system. The test chip, fabricated in 40 nm CMOS technology, occupies 1.77 mm × 2.18 mm containing 2.98 M transistors for logic and 4.29 Mbit on-chip memory. The measured results show that our implementation achieves 25% required frequency reduction (62.5 MHz) and 26% power consumption reduction (54.8 mW) for 60 k-Word real-time continuous speech recognition compared to the previous work. This chip can maximally process 3.02× and 2.25× times faster than real-time at 200 MHz using the bigram and trigram language models, respectively.

  The Institute of Electronics, Information and Communication Engineers, Sep. 2013, Technical report of IEICE. VLD, 113(235) (235), 29 - 34, Japanese


• Soft-Error Tolerant N-P Reversed 6T SRAM Cell

  S. Yoshimoto, S. Izumi, H. Kawaguchi, YOSHIMOTO Masahiko

  Jul. 2013, IEEE Nuclear and Space Radiation Effects Conference (NSREC), PG - 3, English

  [Refereed]

  International conference proceedings


• NMOS-Centered 6T SRAM Layout Reducing Neutron-Induced Multiple Cell Upsets

  YOSHIMOTO Shusuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  This paper presents a proposed NMOS-centered 6T SRAM cell layout that reduces a neutron-induced multiple-cell-upset (MCU) SER on a same wordline. We implemented an 1-Mb SRAM macro in a 65-nm CMOS process and irradiated neutrons as a neutron-accelerated test to evaluate the MCU SER. The proposed 6T SRAM macro improves the horizontal MCU SER by 67-98% compared with a general macro that has PMOS-centered 6T SRAM cells.

  The Institute of Electronics, Information and Communication Engineers, Apr. 2013, Technical report of IEICE. ICD, 113(1) (1), 121 - 126, Japanese


• A Sub-100 mW Dual-Core HOG Accelerator VLSI for Parallel Feature Extraction Processing for HDTV Resolution Video

  Kosuke Mizuno, Kenta Takagi, Yosuke Terachi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Apr. 2013, IEICE TRANSACTIONS ON ELECTRONICS, E96C(4) (4), 433 - 443, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Second-Order All-Digital TDC with Low-Jitter Frequency Shift Oscillators and Dynamic Flipflops

  Toshihiro Konishi, Keisuke Okuno, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Apr. 2013, IEICE TRANSACTIONS ON ELECTRONICS, E96C(4) (4), 546 - 552, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A 168-mW 2.4x-Real-Time 60-kWord Continuous Speech Recognition Processor VLSI

  Guangji He, Takanobu Sugahara, Yuki Miyamoto, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Apr. 2013, IEICE TRANSACTIONS ON ELECTRONICS, E96C(4) (4), 444 - 453, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• An FPGA implementation of a hog-based object detection processor

  Kosuke Mizuno, Yosuke Terachi, Kenta Takagi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Feb. 2013, IPSJ Transactions on System LSI Design Methodology, 6, 42 - 51, English

  [Refereed]

  International conference proceedings


• An Opampless Second-Order MASH Delta Sigma ADC with Using Gated Ring Oscillator Time-to-Digital Converter

  Toshihiro Konishi, Keisuke Okuno, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Feb. 2013, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E96A(2) (2), 434 - 442, English

  [Refereed]

  Scientific journal


• A 40-nm 54-mW 3×-real-time VLSI processor for 60-kWord continuous speech recognition

  Guangji He, Yuki Miyamoto, Kumpei Matsuda, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Institute of Electrical and Electronics Engineers Inc., 2013, IEEE Workshop on Signal Processing Systems, SiPS: Design and Implementation, 147 - 152, English

  International conference proceedings


• A 40-nm 144-mW VLSI Processor for Real-time 60-kWord Continuous Speech Recognition

  Guangji He, Takanobu Sugahara, Tsuyoshi Fujinaga, Yuki Miyamoto, Hiroki Noguchi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2013, 2013 18TH ASIA AND SOUTH PACIFIC DESIGN AUTOMATION CONFERENCE (ASP-DAC), 71 - 72, English

  [Refereed]

  International conference proceedings


• A SUB-100-MILLIWATT DUAL-CORE HOG ACCELERATOR VLSI FOR REAL-TIME MULTIPLE OBJECT DETECTION

  Kenta Takagi, Kosuke Mizuno, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2013, 2013 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), 2533 - 2537, English

  [Refereed]

  International conference proceedings


• Temperature Compensation using Least Mean Squares for Fast Settling All-Digital Phase-Locked Loop

  Keisuke Okuno, Shintaro Izumi, Toshihiro Konishi, Song Dae-Woo, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2013, 2013 IEEE 11TH INTERNATIONAL NEW CIRCUITS AND SYSTEMS CONFERENCE (NEWCAS), pp.1 - 4, English

  [Refereed]

  International conference proceedings


• A 38 mu A Wearable Biosignal Monitoring System with Near Field Communication

  Ken Yamashita, Shintaro Izumi, Masanao Nakano, Takahide Fujii, Toshihiro Konishi, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Hiroshi Nakajima, Toshikazu Shiga, Masahiko Yoshimoto

  2013, 2013 IEEE 11TH INTERNATIONAL NEW CIRCUITS AND SYSTEMS CONFERENCE (NEWCAS), pp.1 - 4, English

  [Refereed]

  International conference proceedings


• Noise-tolerant instantaneous heart rate and R-peak detection using short-term autocorrelation for wearable healthcare systems.

  Takahide Fujii, Masanao Nakano, Ken Yamashita, Toshihiro Konishi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2013, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2013, 7330 - 3, English, International magazine

  [Refereed]

  Scientific journal


• A 14 μa ECG processor with robust heart rate monitor for a wearable healthcare system

  Shintaro Izumi, Ken Yamashita, Masanao Nakano, Toshihiro Konishi, Hiroshi Kawaguchi, Hiromitsu Kimura, Kyoji Marumoto, Takaaki Fuchikami, Yoshikazu Fujimori, Hiroshi Nakajima, Toshikazu Shiga, Masahiko Yoshimoto

  2013, European Solid-State Circuits Conference, 145 - 148, English

  [Refereed]

  International conference proceedings


• A 40-NM 54-MW 3x-REAL-TIME VLSI PROCESSOR FOR 60-KWORD CONTINUOUS SPEECH RECOGNITION

  He, Guangji, Miyamoto, Yuki, Matsuda, Kumpei, Izumi, Shintaro, Kawaguchi, Hiroshi, Yoshimoto, Masahiko

  2013, 2013 IEEE WORKSHOP ON SIGNAL PROCESSING SYSTEMS (SIPS), 147 - 152, English

  [Refereed]

  International conference proceedings


• Low-power Hardware Implementation of Noise Tolerant Heart Rate Extractor for a Wearable Monitoring System

  Shintaro Izumi, Masanao Nakano, Ken Yamashita, Takahide Fujii, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2013, 2013 IEEE 13TH INTERNATIONAL CONFERENCE ON BIOINFORMATICS AND BIOENGINEERING (BIBE), pp.1 - 4, English

  [Refereed]

  International conference proceedings


• A 0.38-V Operating STT-MRAM with Process Variation Tolerant Sense Amplifier

  Yohei Umeki, Koji Yanagida, Shusuke Yoshimoto, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi, Koji Tsunoda, Toshihiro Sugii

  2013, PROCEEDINGS OF THE 2013 IEEE ASIAN SOLID-STATE CIRCUITS CONFERENCE (A-SSCC), 249 - 252, English

  [Refereed]

  International conference proceedings


• A 2.4x-Real-Time VLSI Processor for 60-k Word Continuous Speech Recognition

  MIYAMOTO Yuuki, HE Guangji, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  This paper describes a low-power VLSI chip for 60-kWord continuous speech recognition based on a context-dependent Hidden Markov Model (HMM). Our implementation includes a compression–decoding scheme to reduce the external memory bandwidth for Gaussian Mixture Model (GMM) computation and multi-path Viterbi transition units. We optimize the internal SRAM size using the max-approximation GMM calculation and adjusting the number of look-ahead frames. The measured results show that our implementation achieves 34.2% required frequency reduction (83.3 MHz) and reduces 48.5% power consumption (74.14 mW) for 60 k-Word real-time continuous speech recognition compared to the previous work. This chip can maximally process 2.4× faster than real-time at 200 MHz and 1.1 V with power consumption of 168 mW.

  The Institute of Electronics, Information and Communication Engineers, Dec. 2012, Technical report of IEICE. ICD, 112(365) (365), 49 - 53, Japanese


• Low-Power Ferroelectric 6T4C Shadow SRAM for Normally-Off Computing

  Nakagawa Tomoki, Yoshimoto Shusuke, Kitahara Yuki, Yanagida Koji, Umeki Yohei, Okumura Shunsuke, Izumi Shintaro, Kawaguchi Hiroshi, Yoshimoto Masahiko

  In recent years, sensor network has attracted much attention in agricultural, medical, and disaster-prevention area to collect on-field information. Each sensor node requires extremely low-power operation because its battery size is limited. In the sensor node chip, memory consumes large leakage power so a low-power memory technique is strongly required.
  
  This paper presents a novel low-power technique for a ferroelectric 6T4C shadow SRAM. The shadow SRAM works a high-speed SRAM in an active mode and a nonvolatile FeRAM in a sleep mode. The nonvolatility completely removes the leakage current from the memory. However, the ferroelectric capacitors increase the power consumption and decrease the cycle time of the SRAM. In this paper, the proposed technique is evaluated by SPICE simulation results.

  The Institute of Electronics, Information and Communication Engineers, Dec. 2012, Technical report of IEICE. ICD, 112(365) (365), 41 - 41, Japanese


• FPGA Implementation of HOG-based Real-Time Object Detection Processor

  TAKAGI Kenta, MIZUNO Kosuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Histogram of Oriented Gradients (HOG) is widely accepted feature descriptor for object detection. HOG is robust against changes in illumination and texture. Thus, HOG is highly effective for pedestrian detection and other object detection. In recent years, object detection techniques have been introduced to advanced automobile products and increasingly valuable. Additionally, recent progress of general-purpose processors enables to implement algorithms that require heavy computations such as HOG-based object detection. However, these processors suffer from high power consumption and are therefore unsuitable for mobile systems under limited battery conditions. Therefore, we propose a HOG-based object detection processor. It features a simplified HOG algorithm with cell-based scanning and simultaneous Support Vector Machine (SVM) calculation, cell-based pipeline architecture and parallelized modules. To evaluate the effectiveness of our approach, the proposed architecture is implemented onto a FPGA prototyping board. Results show that the proposed architecture can generate HOG features and detect objects with 40 MHz for SVGA resolution video (800 × 600 pixels) at 72 frames per second (fps).

  The Institute of Electronics, Information and Communication Engineers, Dec. 2012, Technical report of IEICE. ICD, 112(365) (365), 61 - 61, Japanese


• A 40 nm 144 mW VLSI Processor for Real-Time 60-kWord Continuous Speech Recognition

  Guangji He, Takanobu Sugahara, Yuki Miyamoto, Tsuyoshi Fujinaga, Hiroki Noguchi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Aug. 2012, IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 59(8) (8), 1656 - 1666, English

  [Refereed]

  Scientific journal


• Trading off ECU Footprint for Reliability in X-by-Wire Application with Hybrid TMR Architecture

  Y. Nakata, S. Izumi, H. Kawaguchi, YOSHIMOTO MASAHIKO

  Jun. 2012, DAC International Workshop on System Level-Design of Automotive Electronics/Software (SLDAES),, English

  [Refereed]

  International conference proceedings


• Architectural study of HOG feature extraction processor for real-time object detection

  Kosuke Mizuno, Yosuke Terachi, Kenta Takagi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2012, IEEE Workshop on Signal Processing Systems, SiPS: Design and Implementation, 197 - 202, English

  [Refereed]

  International conference proceedings


• Bit Error Rate Estimation in SRAM Considering Temperature Fluctuation

  Yuki Kagiyama, Shunsuke Okumura, Koji Yanagida, Shusuke Yoshimoto, Yohei Nakata, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2012, 2012 13TH INTERNATIONAL SYMPOSIUM ON QUALITY ELECTRONIC DESIGN (ISQED), 516 - 519, English

  [Refereed]

  International conference proceedings


• Divided Static Random Access Memory for Data Aggregation in Wireless Sensor Nodes

  Takashi Matsuda, Shintaro Izumi, Yasuharu Sakai, Takashi Takeuchi, Hidehiro Fujiwara, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  Jan. 2012, IEICE TRANSACTIONS ON COMMUNICATIONS, E95B(1) (1), 178 - 188, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• ARCHITECTURAL STUDY OF HOG FEATURE EXTRACTION PROCESSOR FOR REAL-TIME OBJECT DETECTION

  Kosuke Mizuno, Yosuke Terachi, Kenta Takagi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2012, 2012 IEEE WORKSHOP ON SIGNAL PROCESSING SYSTEMS (SIPS), 197 - 202, English

  [Refereed]

  International conference proceedings


• A 62-dB SNDR Second-Order Gated Ring Oscillator TDC with Two-Stage Dynamic D-Type Flipflops as A Quantization Noise Propagator

  Keisuke Okuno, Toshihiro Konishi, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2012, 2012 IEEE 10TH INTERNATIONAL NEW CIRCUITS AND SYSTEMS CONFERENCE (NEWCAS), 289 - 292, English

  [Refereed]

  International conference proceedings


• HANDSFREE VOICE INTERFACE FOR HOME NETWORK SERVICE USING A MICROPHONE ARRAY NETWORK

  Shimpei Soda, Masahide Nakamura, Shinsuke Matsumoto, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2012, 2012 THIRD INTERNATIONAL CONFERENCE ON NETWORKING AND COMPUTING (ICNC 2012), 195 - 200, English

  [Refereed]

  International conference proceedings


• Implementing Virtual Agent as an Interface for Smart Home Voice Control

  Shimpei Soda, Masahide Nakamura, Shinsuke Matsumoto, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2012, 2012 19TH ASIA-PACIFIC SOFTWARE ENGINEERING CONFERENCE (APSEC), VOL 1, 342 - 345, English

  [Refereed]

  International conference proceedings


• A 51-dB SNDR DCO-Based TDC Using Two-Stage Second-Order Noise Shaping

  Toshihiro Konishi, Keisuke Okuno, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2012, 2012 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS 2012), pp. 3170 - 3173, English

  [Refereed]

  International conference proceedings


• Neutron-Induced Soft Error Rate Estimation for SRAM Using PHITS

  Shusuke Yoshimoto, Takuro Amashita, Masayoshi Yoshimura, Yusuke Matsunaga, Hiroto Yasuura, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2012, 2012 IEEE 18TH INTERNATIONAL ON-LINE TESTING SYMPOSIUM (IOLTS), 138 - 141, English

  [Refereed]

  International conference proceedings


• A 61-dB SNDR 700 μm 2 second-order all-digital TDC with low-jitter frequency shift oscillators and dynamic flipflops

  Toshihiro Konishi, Keisuke Okuno, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2012, IEEE Symposium on VLSI Circuits, Digest of Technical Papers, 190 - 191, English

  [Refereed]

  International conference proceedings


• Instantaneous Heart Rate detection using short-time autocorrelation for wearable healthcare systems.

  Masanao Nakano, Toshihiro Konishi, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2012, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2012, 6703 - 6, English, International magazine

  [Refereed]

  Scientific journal


• A Low-Power Multi-Phase Oscillator with Transfer Gate Phase Coupler Enabling Even-Numbered Phase Output

  Toshihiro Konishi, Hyeokjong Lee, Shintaro Izumi, Takashi Takeuchi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Dec. 2011, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E94A(12) (12), 2701 - 2708, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A 40nm 144mW VLSI Processor for Realtime 60k Word Continuous Speech Recognition

  SUGAHARA Takanobu, HE Guangji, FUJINAGA Tsuyoshi, MIYAMOTO Yuki, NOGUCHI Hiroki, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Nov. 2011, Proceedings of the Custom Integrated Circuits Conference, 111(327) (327), 79 - 84, Japanese

  [Refereed]


• A 40nm 144mW VLSI Processor for Realtime 60k Word Continuous Speech Recognition

  SUGAHARA Takanobu, HE Guangji, FUJINAGA Tsuyoshi, MIYAMOTO Yuki, NOGUCHI Hiroki, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Nov. 2011, IEICE technical report. Component parts and materials, 111(326) (326), 79 - 84, Japanese


• A Low-Power Multi Resolution Spectrum Sensing Architecture for a Wireless Sensor Network with Cognitive Radio

  Toshihiro Konishi, Shintaro Izumi, Koh Tsuruda, Hyeokjong Lee, Takashi Takeuchi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Nov. 2011, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E94A(11) (11), 2287 - 2294, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Low-Power Real-Time SIFT Descriptor Generation Engine for Full-HDTV Video Recognition

  Kosuke Mizuno, Hiroki Noguchi, Guangji He, Yosuke Terachi, Tetsuya Kamino, Tsuyoshi Fujinaga, Shintaro Izumi, Yasuo Ariki, Hiroshi Kawaguchi, Masahiko Yoshimoto

  Apr. 2011, IEICE TRANSACTIONS ON ELECTRONICS, E94C(4) (4), 448 - 457, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Data-Intensive Sound Acquisition System with Large-scale Microphone Array

  Noguchi Hiroki, Takagi Tomoya, Kugata Koji, Izumi Shintaro, Yoshimoto Masahiko, Kawaguchi Hiroshi

  We propose a microphone array network that realizes ubiquitous sound acquisition. Several nodes with 16 microphones are connected to form a novel huge sound acquisition system, which carries out voice activity detection (VAD), sound source localization, and sound enhancement. The three operations are distributed among nodes. Using the distributed network, we produce a low-traffic data-intensive array network. To manage node power consumption, VAD is implemented. The system uses little power when speech is not active. For sound localization, a network-connected multiple signal classification (MUSIC) algorithm is used. The experimental result of the sound-source enhancement shows a signal-noise ratio (SNR) improvement of 7.75dB using 112 microphones. Network traffic is reduced by 99.11% when using 1,024 microphones.

  Information and Media Technologies Editorial Board, 2011, Information and Media Technologies, 6(2) (2), 307 - 318, English


• A 75-variable MIQP solver processor for real-time autonomous robot control

  Masanori Nishino, Hiroki Noguchi, Yusuke Shimai, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2011, 2011 IEEE/SICE International Symposium on System Integration, SII 2011, 469 - 472, English

  [Refereed]

  International conference proceedings


• A 40-nm 640-μm2 45-dB opampless all-digital second-order MASH ΔΣ ADC

  Toshihiro Konishi, Hyeokjong Lee, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2011, Proceedings - IEEE International Symposium on Circuits and Systems, 518 - 521, English

  [Refereed]

  International conference proceedings


• Data-intensive sound acquisition system with large-scale microphone array

  Hiroki Noguchi, Tomoya Takagi, Koji Kugata, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  Information Processing Society of Japan, 2011, Journal of Information Processing, 19, 129 - 140, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Data Aggregation Protocol for Multiple Sound Sources Acquisition with Microphone Array Network

  Shintaro Izumi, Hiroki Noguchi, Tomoya Takagi, Koji Kugata, Shimpei Soda, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2011, 2011 20TH INTERNATIONAL CONFERENCE ON COMPUTER COMMUNICATIONS AND NETWORKS (ICCCN), English

  [Refereed]

  International conference proceedings


• Positioning system for mobile terminals using a microphone array network as an intuitive interface

  Shimpei Soda, Koji Kugata, Tomoya Takagi, Hiroki Noguchi, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2011, 2011 Joint Workshop on Hands-free Speech Communication and Microphone Arrays, HSCMA'11, 155 - 156, English

  [Refereed]

  International conference proceedings


• A 40-nm 640-mu m(2) 45-dB Opampless All-Digital Second-Order MASH Delta Sigma ADC

  Toshihiro Konishi, Hyeokjong Lee, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  2011, 2011 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), pp. 518-521, 518 - 521, English

  [Refereed]

  International conference proceedings


• A 58-mu W Single-Chip Sensor Node Processor with Communication Centric Design

  Shintaro Izumi, Takashi Takeuchi, Takashi Matsuda, Hyeokjong Lee, Toshihiro Konishi, Koh Tsuruda, Yasuharu Sakai, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  Mar. 2010, IEICE TRANSACTIONS ON ELECTRONICS, E93C(3) (3), 261 - 269, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A 34.7-mW Quad-Core MIQP Solver Processor for Robot Control

  Hiroki Noguchi, Junichi Tani, Yusuke Shimai, Masanori Nishino, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2010, IEEE CUSTOM INTEGRATED CIRCUITS CONFERENCE 2010, English

  [Refereed]

  International conference proceedings


• A 60-dB Image Rejection Filter Using Delta-Sigma Modulation and Frequency Shifting

  Toshihiro Konishi, Koh Tsuruda, Shintaro Izumi, Hyeokjong Lee, Hidehiro Fujiwara, Takashi Takeuchi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2009, 2009 IEEE PACIFIC RIM CONFERENCE ON COMMUNICATIONS, COMPUTERS AND SIGNAL PROCESSING, VOLS 1 AND 2, 565 - 570, English

  [Refereed]

  International conference proceedings


• A 58-mu W Single-Chip Sensor Node Processor Using Synchronous MAC Protocol

  Takashi Takeuchi, Shintaro Izumi, Takashi Matsuda, Hyeokjong Lee, Yu Otake, Toshihiro Konishi, Koh Tsuruda, Yasuharu Sakai, Hidehiro Fujiwara, Chikara Ohta, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2009, 2009 SYMPOSIUM ON VLSI CIRCUITS, DIGEST OF TECHNICAL PAPERS, 290 - 291, English

  [Refereed]

  International conference proceedings


• A Single-Chip Sensor Node LSI with Synchronous MAC Protocol and Divided Data-Buffer SRAM

  Takashi Takeuchi, Shintaro Izumi, Takashi Matsuda, Hyeokjong Lee, Toshihiro Konishi, Koh Tsuruda, Yasuhiro Sakai, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  2009, 2009 INTERNATIONAL SOC DESIGN CONFERENCE (ISOCC 2009), 202 - 207, English

  [Refereed]

  International conference proceedings


• Counter-Based Broadcasting with Hop Count Aware Random Assessment Delay Extension for Wireless Sensor Networks

  Shintaro Izumi, Takashi Takeuchi, Takashi Matsuda, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  Nov. 2008, IEICE TRANSACTIONS ON COMMUNICATIONS, E91B(11) (11), 3489 - 3498, English

  [Refereed]

  Scientific journal


• Impact of divided static random access memory considering data aggregation for wireless sensor networks

  Takashi Matsuda, Shintaro Izumi, Takashi Takeuchi, Hidehiro Fujiwara, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  2008, 2008 7th Asia-Pacific Symposium on Information and Telecommunication Technologies, APSITT, pp. 130-134, 115 - 119, English

  [Refereed]

  International conference proceedings


• A Low-Power Multi Resolution Spectrum Sensing (MRSS) Architecture for a Wireless Sensor Network with Cognitive Radio

  Shintaro Izumi, Koh Tsuruda, Takashi Takeuchi, Hyeokjong Lee, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2008, 2010 FOURTH INTERNATIONAL CONFERENCE ON SENSOR TECHNOLOGIES AND APPLICATIONS (SENSORCOMM), 39 - 44, English

  [Refereed]

  International conference proceedings


• Hop Count Aware broadcast algorithm with Random Assessment Delay Extension for wireless sensor networks

  Shintaro Izumi, Takashi Matsuda, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  2008, 2008 7TH ASIA-PACIFIC SYMPOSIUM ON INFORMATION AND TELECOMMUNICATION TECHNOLOGIES, 207 - +, English

  [Refereed]

  International conference proceedings


• Impact of divided static random access memory considering data aggregation for wireless sensor networks

  Takashi Matsuda, Shintaro Izumi, Takashi Takeuchi, Hidehiro Fujiwara, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  2008, 2008 7TH ASIA-PACIFIC SYMPOSIUM ON INFORMATION AND TELECOMMUNICATION TECHNOLOGIES, 115 - +, English

  [Refereed]

  International conference proceedings


• A Flexible Baseband Processor with Multi-Resolution Spectrum-Sensing Functionality

  Koh Tsuruda, Shintaro Izumi, Hyeokjong Lee, Takashi Takeuchi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  2008, 2008 INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY AND ITS APPLICATIONS, VOLS 1-3, 1422 - 1427, English

  [Refereed]

  International conference proceedings


• Improvement of counter-based broadcasting by random assessment delay extension for wireless sensor networks

  Shintaro Izumi, Takashi Matsuda, Hiroshi Kawaguchi, Chikara Ohta, Masahiko Yoshimoto

  2007, 2007 International Conference on Sensor Technologies and Applications, SENSORCOMM 2007, Proceedings, pp.76-81, 76 - 81, English

  [Refereed]

  International conference proceedings

• Estimation of Heartbeat Intervals for Multiple Individuals using Non-contact Multimodal Sensors Utilizing Radio Waves and Acceleration

  和田紗希, 牧村英俊, 西本研悟, 稲沢良夫, 和泉慎太郎

  2024, 電子情報通信学会技術研究報告(Web), 123(446(MICT2023 77-82)) (446(MICT2023 77-82))


• 電波と加速度を用いた非接触マルチモーダルセンサによる心拍間隔推定

  和田紗希, 牧村英俊, 西本研悟, 稲沢良夫, 和泉慎太郎

  2024, 日本生体医工学会大会プログラム・抄録集(Web), 63rd


• Development of Flexible Thermoelectric Conversion Devices and Hot/Cold Display Technology Contributing to the Next Generation IoT Society

  菅原徹, 菅原徹, 和泉慎太郎, 和泉慎太郎, 佐藤克成, 佐藤克成, 吉國聖乃, 吉國聖乃, 伊藤雄一, 伊藤雄一, 伊庭野健造, 伊庭野健造

  2024, セラミックス, 59(6) (6)


• Estimation of Heartbeat Intervals using Non-contact Multimodal Sensors Utilizing Radio Waves and Acceleration

  和田紗希, 牧村英俊, 西本研悟, 稲沢良夫, 和泉慎太郎

  2024, 日本生体医工学会大会プログラム・抄録集(Web), 63rd


• Analysis of the waveform pattern classification of SpO2 in Sleep Apnea Syndrome patients

  高安みずき, 永野達也, 山本正嗣, 和泉慎太郎, 桂田直子, 吉崎飛鳥, 羽間大祐, 松村佳乃子, 立原素子, 小林和幸

  2024, 日本呼吸器学会誌(Web), 13


• Comparison of two wearable respiratory monitors: a prospective observational study

  佐藤宏紀, 永野達也, 和泉慎太郎, 平位一廣, 吉村遼佑, 岩本夏彦, 藤本昌大, 福井崇文, 高田尚哉, 高安みずき, 山田潤, 矢谷敦彦, 三村千尋, 福田貴与子, 古川皓一, 羽間大祐, 桂田直子, 山本正嗣, 立原素子, 小林和幸

  2024, 日本呼吸器学会誌(Web), 13


• Thin-film Organic Active Matrix for Ultraflexible Infrared Imagers

  川端玲, 川端玲, LI Kou, 荒木徹平, 荒木徹平, 秋山実邦子, 秋山実邦子, 杉町夏穂, 杉町夏穂, 松岡望, 松岡望, 高橋典華, 酒井大揮, 松崎勇斗, 越水瞭, 阿部岳晃, 和泉慎太郎, 和泉慎太郎, 栗平直子, 植村隆文, 河野行雄, 河野行雄, 関谷毅, 関谷毅, 関谷毅

  2024, Symposium on Microjoining and Assembly Technology in Electronics, 30th


• Heartbeat-based Non-contact Biometric Authentication Using Microwave Doppler Sensor

  高橋宏太, 和泉慎太郎, 川口博

  [東京] : Institute of Electrical Engineers of Japan, Nov. 2023, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 40, 5p, Japanese


• 国際会議報告：IEEE Sensors 2022

  和泉 慎太郎

  一般社団法人 電気学会, 01 Apr. 2023, 電気学会論文誌Ｅ（センサ・マイクロマシン部門誌）, 143(4) (4), NL4_1 - NL4_1, Japanese


• 利便性向上のためのメタプログラミング環境の検討

  吉川, 慎太郎, 和泉, 諭

  プログラミング言語C++では、メタプログラミングの１つであるテンプレートメタプログラミングという手法が広く使われている。この手法は最適化されたアセンブリの出力や擬似的な言語機能の拡張、コンパイル時に事前処理や計算ができる一方、プログラムの可読性の低下やエラーメッセージが煩雑になる問題がある。本研究では前述の問題を改善しC++開発の効率化を行うことを目的とし、拡張言語からC++のソースコードを生成するメタプログラミング環境を実装する。

  16 Feb. 2023, 第85回全国大会講演論文集, 2023(1) (1), 231 - 232, Japanese


• Contactless respiration monitoring using spatial ultrasound Doppler sensor

  都甲尚志, 河合晃聖, 石井徹, 和泉慎太郎, 川口博

  2023, 電子情報通信学会大会講演論文集(CD-ROM), 2023


• Ray-tracing ultrasonic simulation method for bathroom surveillance

  BIN KAMARULZAMAN M. Shahrul Amir, 濱邉理久, 安田祐人, 大原遼太郎, 佐藤駿, 和泉慎太郎, 川口博

  2023, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 40th


• 3D person location estimation using spatial ultrasound and VAE in the bathroom

  佐藤駿, 安田祐人, 大原遼太郎, 濱邉理玖, 玄田貴之, 今中翔哉, 和泉慎太郎, 川口博

  2023, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 40th


• Bathroom acoustic event detection using machine learning

  森浩貴, 玄田貴之, 佐藤駿, 大原遼太郎, SHAHRUL Muhammad, 安田裕人, 河合晃聖, 濱邉理玖, 和泉慎太郎, 川口博

  2023, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 40th


• 次世代IoT社会に資するフレキシブル熱電変換デバイスと温冷提示技術の開発

  菅原徹, 和泉慎太郎, 佐藤克成, 伊藤雄一, 伊庭野健造

  2023, クリーンテクノロジー, 33(3) (3)


• Visualization of hand position of Leopold’s maneuvers using video image and the pose estimation and questionnaire survey of observation details -Comparison of beginners vs. experts-

  辻宅紀子, 齋藤いずみ, 和泉慎太郎

  2023, 看護理工学会誌(Web), 10


• Road traffic monitoring by machine learning using ultrasonic and audible sound

  濱邉理玖, 大原遼太郎, 安田祐人, 佐藤駿, 川口博, 和泉慎太郎

  2023, 電子情報通信学会大会講演論文集(CD-ROM), 2023


• Feature Extraction from Body Surface Potential using Variational Autoencoder

  吉野早耶, 和泉慎太郎, 川口博

  2023, 電子情報通信学会大会講演論文集(CD-ROM), 2023


• 1W/8R20T SRAMコードブックメモリによる深層学習プロセッサの主記憶帯域削減

  大原遼太郎, 加太雅也, 大地正和, 大地正和, 安田祐人, 大地正和, 濱邉理玖, 和泉慎太郎, 川口博

  2023, 電子情報通信学会技術研究報告(Web), 123(143(SDM2023 35-53)) (143(SDM2023 35-53))


• 頸髄不全損傷患者における下肢伸展挙上運動の体幹筋活動解析と歩行獲得の関連

  杉本達也, 杉本達也, 和泉慎太郎, 上田雄也, 目片幸二郎, 前沢寿亨, 瀧川朋亨, 伊藤康夫

  2023, 理学療法兵庫, (29) (29)


• いびき音のディープラーニングによる睡眠時無呼吸症候群のスクリーニング

  永野達也, 関谷怜奈, 和泉慎太郎

  2023, 日本睡眠学会定期学術集会プログラム・抄録集, 45th


• 体表面電位用シート型伸縮電極アレイと多チャネル小型無線計測システムの開発

  荒木徹平, 和泉慎太郎, 和泉慎太郎, 村瀬翔, 村瀬翔, 関谷毅

  2023, 臨床神経生理学(Web), 51(5) (5)


• Increasing the Sensitivity of Piezoelectric Pulse Wave Sensors for Pulse Wave Propagation Measurement

  Masaki Ishibashi, Shintaro Izumi, Ryo Takamatsu, Shusuke Yoshimoto, Yuki Noda, Teppei Araki, Takafumi Uemura, Tsuyoshi Sekitani, Hiroshi Kawaguchi

  2023, IEEE Sensors Letters, 7(9) (9)


• Visualization of hand position of Leopold's maneuvers using video image and the pose estimation and questionnaire survey of observation details－Comparison of beginners vs. experts－

  Tsujitaku Noriko, Saito Izumi, Izumi Shintaro

  レオポルド触診法の習得は，経験則による部分が大きい．本研究は触診の実施状況を可視化し，段法ごとの差や初学者（看護学生）と熟練者（助産師）の相違点を調査することで効率的な手技習得に繋がる資料を得ることを目的とした．初学者と熟練者各５名が妊婦腹部触診モデルに対して触診法を実施する場面を動画像で記録し，骨格推定アルゴリズムで手指の位置を座標情報として検出した．動画像を目視で観察し，観察項目は質問紙にて調査した．目視の観察から，熟練者は定められた方法で触診を実施しない傾向を認めた．触診範囲については，第１・２段法で熟練者のほうが大きい傾向がみられ，触診部位については第３段法において熟練者がより胎児下降部に近い位置を触診する傾向を認めた．観察項目では，子宮収縮など熟練者のみが観察していた項目もあり熟練者・初学者間で差異がみられた．本研究のみでは教育への資料を得ることはむずかしく，さらなる研究が必要である．
  
  【キーメッセージ】
  1．今回の研究は看護・介護のどのような問題をテーマにしているのか？
  研究を行うきっかけとなったことはどのようなことか？
  → 看護技術を学ぶ際に感覚やイメージで補われている部分を量的に可視化できないかと考えたこと．
  
  2．この研究成果が看護・介護にどのように貢献できるのか？あるいは，将来的に貢献できることは何か？
  → 本研究の限界と課題をもとに研究を重ねることで，看護技術習得における資料を得られると考える．
  
  3．今後どのような技術が必要になるのか？
  → 本研究の課題を改善するためには手指の検出精度の向上や異常値の効率的な除外技術が必要である．

  The Society for Nursing Science and Engineering, 2023, Journal of Nursing Science and Engineering, 10, 135 - 145, Japanese


• Non-contact vital monitoring using spatial ultrasound

  河合晃聖, 和泉慎太郎, 川口博, 近藤勲, 小椋朗広

  Institute of Electrical Engineers of Japan, Nov. 2022, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 39, 3p, Japanese


• Analysis of SLR in spinal cord injury patients using multimodal sensing

  吉倉崚人, 和泉慎太郎, 杉本達也, 川口博, 杉本達也

  Institute of Electrical Engineers of Japan, Nov. 2022, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 39, 4p, Japanese


• Wearable Perspiration Volume Sensor Using Dual-Frequency Impedance Measurement

  Ryo Takamatsu, Shogo Amano, Shintaro Izumi, Hiroshi Ohta, Toshikazu Nezu, Yuki Noda, Teppei Araki, Takafumi Uemura, Tsuyoshi Sekitani, Hiroshi Kawaguchi

  IEEE, 30 Oct. 2022, 2022 IEEE Sensors, 39, 1 - 4, Japanese


• Wearable Perspiration Volume Sensor Using Dual-Frequency Impedance Measurement

  高松稜, 和泉慎太郎, 川口博

  2022, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 39th


• Outdoor 3D object reconstruction method using spatial ultrasound and VAE

  佐藤駿, 安田祐人, 大原遼太郎, 濱邉理玖, 石井徹, 和泉慎太郎, 川口博

  2022, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 39th


• Low Power Noise Reduction Technology for ECG Sensors Using Dry Electrodes

  元辻有貴, 和泉慎太郎, 川口博

  2022, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 39th


• Changes in sock-wearing behavior and compensatory movements before and after wearing a materinty-simulation jacket -Study using video images and pose estimation algorithms-

  野田真優子, 齋藤いずみ, 和泉慎太郎

  2022, 看護理工学会誌(Web), 10


• Thermal Stimulation Device Using Matrix Drive Circuitry

  江森俊哉, 和泉慎太郎, 和泉慎太郎, 伊庭野健造, 伊庭野健造, 伊藤雄一, 伊藤雄一, 佐藤克成, 佐藤克成, 菅原徹, 菅原徹, 川口博

  2022, 日本機械学会ロボティクス・メカトロニクス講演会講演論文集(CD-ROM), 2022


• Development of flexible thermoelectric conversion device for Society of Internet of Things (IoT)

  菅原徹, 菅原徹, 菅原徹, 和泉慎太郎, 和泉慎太郎, 伊庭野健造, 伊庭野健造

  2022, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 83rd


• Changes in sock-wearing behavior and compensatory movements before and after wearing a materinty-simulation jacket−Study using video images and pose estimation algorithms−

  Noda Mayuko, Saito Izumi, Izumi Shintaro

  As pregnancy progresses, the abdomen increases and pregnant womenss daily activities are expected to change. This study aimed to reproduce the changes in the body shape of pregnant females in third trimester using a maternity-simulation jacket, clarify the changes in movement patterns before and after wearing the jacket, and obtain useful suggestions for health guidance in pregnancy. Seventeen females were asked to put on socks in the sitting position before and after wearing the jacket; the characteristic changes in their movement were observed and evaluated from the recorded video images. Joint positions were estimated using a pose estimation algorithm, and three-dimensional coordinate information was extracted. Joint angles were calculated, and trends in movement patterns were analyzed using principal component analysis. In the end-occupant position, 8 (47.0%) wore socks with their thighs parallel to the mid-plane before wearing the device, and 9 (52.9%) wore socks with their hip joints in abduction and external rotation after wearing the device. The results suggest the necessity of using hip stretching and a sock-wearing self-help device.

  The Society for Nursing Science and Engineering, 2022, Journal of Nursing Science and Engineering, 10, 12 - 21, Japanese


• Effects of the presence of parturient women on the length of time that nurses and midwives spend in the rooms of other patients during a night shift in a mixed obstetric ward

  寺岡歩, 齋藤いずみ, 和泉慎太郎, 大滝千文, 大滝千文, 西川美樹, 大澤佳代

  2022, 看護理工学会誌(Web), 9


• Non-Contact Biometric Identification Using Microwave Doppler Sensor

  和泉慎太郎

  シーエムシー出版, 2021, 機能材料, 41(11) (11), 3 - 9, Japanese


• An analysis of the locations visited by night shift midwives and the duration spent in each while providing round-the-clock critical care to high-risk mothers in a maternity ward

  西川美樹, 齋藤いずみ, 大滝千文, 大澤佳代, 和泉慎太郎

  2021, 看護理工学会誌(Web), 9


• マイクロ波ドップラーセンサを用いた心拍計測における個人差の評価

  真鍋歩夢, 和泉慎太郎, 落合拓光, 川口博

  2021, 電子情報通信学会技術研究報告(Web), 121(24(WBS2021 1-21)) (24(WBS2021 1-21))


• 大型船舶エンジンの燃料効率改善を目的とした回転体位相計測センサの開発

  小銭瞭介, 原田正康, 吉川裕木子, 石井徹, 和泉慎太郎, 川口博, 上村祥平, 荒木要, 松田真理子

  2021, マリンエンジニアリング学術講演会講演論文集, 91st


• Analysis of night-shift nurses’ locations and durations using information communication equipment: A prospective observational study of a mixed obstetric ward with severe patients in Japan

  大滝千文, 齋藤いずみ, 和泉慎太郎, 大澤佳代, 大澤佳代

  2020, 看護理工学会誌(Web), 7


• A Consideration of Heart Rate Measurement Technology with Doppler sensor

  落合拓光, 和泉慎太郎, 矢野裕二, 川口博, 吉本雅彦

  2020, 電子情報通信学会大会講演論文集(CD-ROM), 2020


• A Study of Machine Learning Architecture for Wearable Bio-signal Sensor

  渡辺大輔, 矢野祐二, 和泉慎太郎, 川口博, 吉本雅彦

  2020, 電子情報通信学会大会講演論文集(CD-ROM), 2020


• Low Power circuit for Electro-Cardiogram Measurement Using Body Temperature Power Generation

  藤井将裕, 和泉慎太郎, 矢野裕二, 川口博, 吉本雅彦

  2020, 電子情報通信学会大会講演論文集(CD-ROM), 2020


• 加速度センサとひずみセンサを用いた咳嗽検出手法の検討

  渡辺大輔, 和泉慎太郎, 大歳丈博, 永野達也, 西村善博, 吉本雅彦, 川口博

  2020, 電子情報通信学会技術研究報告(Web), 120(219(MICT2020 7-20)) (219(MICT2020 7-20))


• Analysis of day shift nurses’ and midwives’ locations and durations using information communication equipment: A prospective observational study of a mixed obstetric ward with critical patients in Japan

  大滝千文, 齋藤いずみ, 和泉慎太郎, 大澤佳代

  2020, 看護理工学会誌(Web), 7


• Heart Rate Interval Error Compensation Method Using Multiple-Photoplethysmography

  親富彩花, 和泉慎太郎, 矢野裕二, 川口博, 吉本雅彦

  2020, 電子情報通信学会大会講演論文集(CD-ROM), 2020


• Classification of nocturnal hypoxemia for the patients with idiopathic pulmonary fibrosis

  安田裕一郎, 永野達也, 安田美奈, 鶴野広介, 岡村佳代子, 船田泰弘, 高月清宣, 飛野和則, 西馬照明, 大西尚, 小林和幸, 和泉慎太郎, 西村善博

  2020, 日本呼吸器学会誌(Web), 9


• 開発した新型パッチ式脳波計測シートの更年期診療への応用の可能性の検討

  志村宏太郎, 澤田健二郎, 香林正樹, 香林正樹, 山本実咲, 清水亜麻, 八木太郎, 和泉慎太郎, 倉智博久, 関谷毅, 木村正

  2020, 日本女性医学学会雑誌, 28(1) (1)


• Analysis of night-shift nurses' locations and durations using information communication equipment: A prospective observational study of a mixed obstetric ward with severe patients in Japan

  Otaki Chifumi, Saito Izumi, Izumi Shintaro, Osawa Kayo

  Approximately 80% of hospital-based childbirth in Japan takes place in mixed obstetric wards, which comprise a mix of the obstetrics department and other departments. Although mixed obstetric wards treat patients from multiple departments, previous studies have not clarified the procedures used by nursing staff in the ward, or nursing by night-time nurses. The purpose of this study was to reveal the actual status of night-shift nurses in a mixed obstetrics ward that treats severe patients. This time motion study used smartphones and beacons to measure the place and duration of stay for night-shift nurses working in a mixed obstetric ward. We found that nurses' mean bedside stay time per patient in a general patient room was 31.9 minutes on days when there were severe patients hospitalized in the severe patient room, and 33.6 minutes on days when there were no severe patients. Furthermore, the mean stay time in each place during a nurse's 13-hour shift was 39.2% in the nurse station, 34.4% in the general patient room, and 1.7% in the severe patient room. We believe that these results can be used as data for the placement of nursing staff involved in operating a safe mixed ward.

  The Society for Nursing Science and Engineering, 2020, Journal of Nursing Science and Engineering, 7(0) (0), 13 - 24, English

  Link to Kobe Univ. Repository (Kernel)


• A Low-Power Photoplethysmography Sensor Using Current Integration Circuit

  笹井香菜, 和泉慎太郎, 渡辺健斗, 矢野祐二, 川口博, 吉本雅彦

  Institute of Electrical Engineers of Japan, 19 Nov. 2019, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 36, 4p, Japanese


• 大面積シート型インフラモニタリングシステムの開発 (特集 3月研究会「IoT/AIに応える有機分子・バイオエレクトロニクスデバイス」)

  植村 隆文, 荒木 徹平, 吉本 秀輔, 野田 祐樹, 和泉 慎太郎, 関谷 毅, 森 時彦, 高宮 真, 桜井 貴康, 濱田 浩, 河村 直明, 塚田 智之, 小林 保之, 滝野 晶平, 井出 周治, 瀬下 雄一, 堤 知明, 桒原 惇, 大籏 英樹, 石井 伸晃, 尾藤 慎也, 金村 崇, 桑原 章史, 水野 晃太郎, 福原 克郎, 田中 稔彦, 高安 理寛, 山本 陽介

  応用物理学会有機分子・バイオエレクトロニクス分科会, Feb. 2019, Molecular electronics and bioelectronics = 応用物理学会,有機分子・バイオエレクトロニクス分科会会誌, 30(1) (1), 25 - 28, Japanese


• 光電式容積脈波法を用いた脈拍測定の低消費電力化手法

  渡辺健斗, 和泉慎太郎, 矢野祐二, 川口博, 吉本雅彦

  2019, 電子情報通信学会技術研究報告, 118(383(MICT2018 59-67)(Web)) (383(MICT2018 59-67)(Web))


• Noise Evaluation Method for EEG Measurement System

  稲岡美咲, 稲岡美咲, 和泉慎太郎, 吉本秀輔, 吉本秀輔, 根津俊一, 野田祐樹, 荒木徹平, 植村隆文, 植村隆文, 関谷毅, 関谷毅

  2019, 電子情報通信学会技術研究報告, 118(509(MICT2018 68-73)(Web)) (509(MICT2018 68-73)(Web))


• 布電極を用いたマルチモーダル生体信号計測の検討

  天野将吾, 天野将吾, 天野将吾, 松場瑞生, 松場瑞生, 和泉慎太郎, 和泉慎太郎, 吉本秀輔, 野田祐樹, 荒木徹平, 荒木徹平, 荒木徹平, 植村隆文, 植村隆文, 伊藤晴彦, 関谷毅, 関谷毅, 関谷毅

  2019, 電子情報通信学会技術研究報告, 119(263(MICT2019 23-37)(Web)) (263(MICT2019 23-37)(Web))


• ウェアラブル生体情報センサのための学習推論アルゴリズムの検討

  渡辺大輔, 矢野祐二, 和泉慎太郎, 川口博, 吉本雅彦

  2019, 電子情報通信学会技術研究報告, 119(263(MICT2019 23-37)(Web)) (263(MICT2019 23-37)(Web))


• ARモデルを用いた心拍変動解析のための低消費電力アーキテクチャの検討

  吉田聖也, 和泉慎太郎, 矢野裕二, 川口博, 吉本雅彦

  2019, 電子情報通信学会大会講演論文集(CD-ROM), 2019


• イリョウ キカン カラ ザイタク イリョウ ・ カンゴ ソウゴウ レンケイ ニ カンスル ケンキュウ 、 ザイタク イリョウ ・ カイゴ ニ カンスル ケンキュウ

  大滝 千文, 和泉 慎太郎, 岩佐 由美

  フランスベッド・メディカルホームケア研究・助成財団, 2019, 研究助成・事業助成ボランティア活動助成報告書, 30, 87 - 101, Japanese


• 車載テクノロジー最前線 マイクロ波ドップラーセンサを用いた走行車両内での心拍計測

  和泉 慎太郎

  技術情報協会, Apr. 2018, 車載テクノロジー = Automotive technology, 5(4) (4), 44 - 47, Japanese


• 産科混合病棟における情報通信機器を使った看護の可視化 産科と産科以外の科の患者のベッドサイド滞在時間の分析による考察

  齋藤いずみ, 寺岡歩, 中井かをり, 三井由紀子, 和泉慎太郎

  2018, 日本看護管理学会学術集会抄録集, 22nd


• Wearable Monitoring Systems for Heart Rate Variability Analysis

  和泉慎太郎

  2018, 電子情報通信学会技術研究報告, 118(173(ICD2018 14-38)) (173(ICD2018 14-38))


• メモリ容量と帯域幅削減のための分散深層学習ハードウェア

  川口博, 森陽紀, 陽川哲也, 和泉慎太郎, 井上淳樹

  2018, 電気関係学会関西連合大会講演論文集(CD-ROM), 2018


• Field Intelligence搭載型大面積分散IoTプラットフォームの研究開発

  植村隆文, 荒木徹平, 吉本秀輔, 野田祐樹, 和泉慎太郎, 関谷毅, 加賀谷司, 森時彦, 高宮真, 桜井貴康, 濱田浩, 河村直明, 塚田智之, 井出周治, 瀬下雄一, 堤知明, 桑原惇, 大はた英樹, 石井伸晃, 尾藤慎也, 金村崇, 桑原章史, 水野晃太郎, 福原克郎, 田中稔彦, 片桐真吾, 高安理寛, 山本陽介

  2018, 電子情報通信学会大会講演論文集(CD-ROM), 2018


• Chemical Reaction Actuator and Wireless Power Feeding for Swallowable Sensing Device

  中村 亮太, 和泉 慎太郎, 川口 博, 吉本 雅彦, 太田 英敏

  Institute of Electrical Engineers of Japan, 31 Oct. 2017, 「センサ・マイクロマシンと応用システム」シンポジウム論文集 電気学会センサ・マイクロマシン部門 [編], 34, 1 - 5, Japanese


• Improvement of measurement accuracy and usability in wearable biosignal monitoring

  和泉慎太郎

  電子情報通信学会, 11 May 2017, 電子情報通信学会技術研究報告, 117(19) (19), 37 - 41, Japanese


• 奨励講演 ウェアラブル生体情報計測における計測精度とユーザビリティの向上—Improvement of measurement accuracy and usability in wearable biosignal monitoring—ヘルスケア・医療情報通信技術

  和泉 慎太郎

  電子情報通信学会, May 2017, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117(20) (20), 37 - 41, Japanese


• マイクロ波ドップラーセンサを用いた車両走行中の心拍計測手法

  松永大地, 和泉慎太郎, 川口博, 吉本雅彦

  2017, 電子情報通信学会大会講演論文集(CD-ROM), 2017


• ヘルスケアIoTに向けた生体センシングの低消費電力化と非接触化

  和泉慎太郎

  2017, 電子情報通信学会大会講演論文集(CD-ROM), 2017


• ノイズフィードバック技術を用いたウェアラブル向け容量結合型心電センサ

  永里佑樹, 和泉慎太郎, 川口博, 吉本雅彦

  2017, 電子情報通信学会大会講演論文集(CD-ROM), 2017


• ウェアラブル生体センサの現状と小型軽量化・低消費電力化を実現する技術 (特集 ウェアラブルデバイスへ向けた薄くて曲がる電源,電池技術)

  和泉 慎太郎

  技術情報協会, Jun. 2016, エネルギーデバイス = Energy device, 3(5) (5), 50 - 53, Japanese


• 上腕骨小頭離断性骨軟骨炎の病巣部位の検討―投球時痛を生じるphaseによる比較―

  前田 慎太郎, 濱田 和明, 和泉 昌宏, 橋本 和典

  【はじめに，目的】青少年期野球選手のみを対象として上腕骨小頭離断性骨軟骨炎（以下OCD）の病巣部位を調査した報告は非常に少ない。また，投球時痛を生じるタイミングとOCDの病巣部位の関連性を調査した報告は見当たらない。そこで，本研究ではOCDの病巣部位を調査し，さらに投球時痛を生じるphase（以下painful phase）による比較検討を行ったので報告する。【方法】対象は2010年1月から2015年9月に受診しOCDと診断された青少年期野球選手42名とした。年齢（平均±標準偏差）は発症時13.2±1.3歳，受診時13.7±1.4歳で，性別は全例男性であった。ポジションは投手20名，内野手16名，捕手3名，外野手3名であった。X線分類（岩堀2006）は中央型7名，広範囲型35名であった。病巣部位の検討は，MRIのT1強調矢状断像にて，上腕骨長軸線に対して病巣部後下縁と前上縁を結んだ線の垂線が成す角度（以下病巣角）を算出した。すなわち，病巣角が大きいほど病巣がより前方に位置することを意味する。次に，問診にて聴取可能であった34名をpainful phaseによって群分けし，各群間の病巣角を比較検討した。統計処理は一元配置分散分析を行い，多重比較検定はTukey-Kramer法を用いた。危険率5％未満を有意とした。【結果】全42名の病巣角の平均値は64.8±12.3°であった。次に，聴取可能であった34名のpainful phaseの内訳は，Late Cocking（LC）期が6名（18％），Acceleration（Acc）期が14名（41％），Deceleration（Dcl）期が8名（23％），投球中は痛くないが後で痛い（After pain）が3名（9%），痛みは全くない（No pain）が3名（9％）であった。各群の病巣角は，LC群77.6±12.0°，Acc群65.0±11.3°，Dcl群55.0±11.7°，After pain群66.9±4.2°，No pain群60.1±3.1°であった。LC群はDcl群よりも病巣角が有意に大きかった（p＜0.01）。その他の各群間には有意な差を認めなかった。【結論】本研究の結果，病巣角は64.8±12.3°であった。これは，先行研究（室井ら2008）の報告における54.0±9.3°（n=16）と比較して約10°大きい値であり，OCDの病巣が小頭のより前方に位置することが示唆された。このことより，青少年期野球選手のOCD症例は，肘関節屈曲位を強めた投球動作を行うことで腕橈関節に特異的なストレスを生じている可能性が考えられる。また，painful phaseによる比較ではLC群がDcl群よりも有意に病巣角が大きく，LC群は小頭のより前方に，Dcl群はより後方に病巣が位置することが示唆された。これらより，投球動作時に痛みを生じる際の肘関節肢位とOCDの病巣部位に関連性がある可能性が考えられた。一方で，After pain群やNo pain群を約18％認めたことから，OCDは必ずしも投球時痛を伴うものではないという事実も考慮する必要があり，結果の解釈には注意を要する。本研究の結果はOCD発生要因検討の一助となると考える。今後は身体機能や投球フォームも含めた検討が必要である。

  公益社団法人 日本理学療法士協会, 2016, 理学療法学Supplement, 2015, 1260, Japanese


• ヘルスケアデバイスと材料

  川口博, 和泉慎太郎, 吉本雅彦

  2016, 日本化学会春季年会講演予稿集(CD-ROM), 96th


• 日常生活の常時モニタリングを実現する生体情報計測技術

  和泉慎太郎

  2016, センサ・マイクロマシンと応用システムシンポジウム(CD-ROM), 33rd


• 研究室だより：神戸大学大学院システム情報学研究科情報科学専攻 吉本・川口研究室

  和泉 慎太郎, 川口 博, 吉本 雅彦

  一般社団法人 電気学会, 2016, 電気学会論文誌. E, センサ・マイクロマシン部門誌, 136(3) (3), NL3_2 - NL3_2, Japanese


• マイクロ波ドップラーセンサーを用いた車載応用非接触心拍変動・呼吸モニタリング技術の開発

  和泉 慎太郎

  タカタ財団, 2016, タカタ財団助成研究論文集, 2016, 中扉1p,1 - 32, Japanese


• A low-power wearable electrocardiogram sensor SoC

  IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  Monitoring of daily life using a wearable sensor is useful to prevent lifestyle diseases. This paper presents an electrocardiograph (ECG) monitoring SoC using a non-volatile MCU and a noise-tolerant instantaneous heartbeat detector.

  The Japan Society of Applied Physics, 2016, Oyo Buturi, 85(4) (4), 301 - 305, Japanese

  Introduction scientific journal


• Haptic Stimulus Actuator using Piezoelectric Pump for Wearable Devices

  児玉 泰佑, 和泉 慎太郎, 正木 何奈, 川口 博, 吉本 雅彦, 前中 一介

  Institute of Electrical Engineers of Japan, 28 Oct. 2015, 「センサ・マイクロマシンと応用システム」シンポジウム論文集 電気学会センサ・マイクロマシン部門 [編], 32, 1 - 5, Japanese


• Non-contact and Noise Tolerant Heart Rate Monitoring using Microwave Doppler Sensor and Range Imagery

  Daichi Matsunag, Shintaro Izumi, Keisuke Okuno, Hiroshi Kawaguchi, Masahiko Yoshimoto

  This paper describes a non-contact and noise-tolerant heart beat monitoring system. The proposed system comprises a microwave Doppler sensor and range imagery using Microsoft Kinect™. The possible application of the proposed system is a driver health monitoring. We introduce the sensor fusion approach to minimize the heart beat detection error. The proposed algorithm can subtract a body motion artifact from Doppler sensor output using time-frequency analysis. The body motion artifact is a crucially important problem for biosignal monitoring using microwave Doppler sensor. The body motion speed is obtainable from range imagery, which has 5-mm resolution at 30-cm distance. Measurement results show that the success rate of the heart beat detection is improved about 75% on average when the Doppler wave is degraded by the body motion artifact.

  Institute of Electrical Engineers of Japan, 28 Oct. 2015, Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 32, 1 - 5, Japanese, International magazine


• A Noise-Tolerant ECG Sensing Method for Wearable Healthcare Systems

  TANAKA Yoshito, KAWAMOTO Yuta, NAKAI Youzaburo, OKUNO Keisuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  The Institute of Electronics, Information and Communication Engineers, 24 Nov. 2014, IEICE technical report. Computer systems, 114(346) (346), 47 - 47, Japanese


• A Normally-off Wearable Monitoring SoC using Non-volatile MCU

  Matsunaga Daichi, NAKAI Yozaburo, KAWAMOTO Yuta, NAKAGAWA Tomoki, OKUNO Keisuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  The Institute of Electronics, Information and Communication Engineers, 24 Nov. 2014, Technical report of IEICE. ICD, 114(345) (345), 49 - 49, Japanese


• 低消費電力貼り付け型センサのためのテンプレートマッチングを用いたロバスト心拍抽出手法の開発

  中井 陽三郎, 和泉 慎太郎, 中野 将尚

  Institute of Electrical Engineers of Japan, 20 Oct. 2014, 「センサ・マイクロマシンと応用システム」シンポジウム論文集 電気学会センサ・マイクロマシン部門 [編], 31, 1 - 4, Japanese


• A 0.38-V Operating STT-MRAM with Process Variation Tolerant Sense Amplifier

  UMEKI Yohei, YANAGIDA Koji, YOSHIMOTO Shusuke, IZUMI Shintaro, YOSHIMOTO Masahiko, Kawaguchi Hiroshi, TSUNODA Koji, SUGII Toshihiro

  This paper exhibits a 65-nm 8-Mb spin transfer torque magnetoresistance random access memory (STT-MRAM) operating at a single supply voltage with a process-variation tolerant sense amplifier. The proposed sense amplifier comprises a boosted-gate nMOS and negative-resistance pMOSes as loads, which maximizes the readout margin in any process corner. The STT-MRAM achieves a cycle time of 1.9μs (=0.526MHz) at 0.38V. The operating power is 6.15μW at that voltage. The minimum energy per access is 3.89pJ/bit when the supply voltage is 0.44V. The proposed STT-MRAM operates at lower energy than SRAM when a utilization of a memory bandwidth is 14% or less.

  The Institute of Electronics, Information and Communication Engineers, 17 Apr. 2014, Technical report of IEICE. ICD, 114(13) (13), 47 - 51, Japanese


• STT-MRAM Architecture for Improving Throughput

  Mori Haruki, Yanagida Koji, Umeki Yohei, Yoshimoto Shusuke, Izumi Shintaro, Yoshimoto Masahiko, Kawaguchi Hiroshi, Tsunoda Koji, Sugii Toshihiro

  The Institute of Electronics, Information and Communication Engineers, 21 Jan. 2014, Technical report of IEICE. ICD, 113(419) (419), 27 - 27, Japanese


• High-Speed Ferroelectric 6T4C Shadow SRAM for Normally-Off Computing

  NAKAGAWA Tomoki, YOSHIMOTO Shusuke, KITAHARA Yuki, YANAGIDA Koji, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  The Institute of Electronics, Information and Communication Engineers, 21 Jan. 2014, Technical report of IEICE. ICD, 113(419) (419), 39 - 39, Japanese


• Electrocardiogram analytical technique for wearable living body sensors wearable biomedical sensor

  NAKAI Yozaburo, IZUMI Shintaro, NAKANO Masanao, YAMASHITA Ken, FUJII Takahide, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  The Institute of Electronics, Information and Communication Engineers, 21 Jan. 2014, Technical report of IEICE. ICD, 113(419) (419), 61 - 61, Japanese


• Cross-Layer Design for Ubiquitous Sensing Systems : From Circuit to Application

  IZUMI Shintaro

  The Institute of Electronics, Information and Communication Engineers, 21 Jan. 2014, Technical report of IEICE. ICD, 113(419) (419), 79 - 79, Japanese


• ウェアラブルな生体情報常時計測システムのための心拍抽出手法の開発

  和泉慎太郎

  2014, 立石科学技術振興財団助成研究成果集, (23) (23)


• A2.4x-Real-Time VLSI Processor for 60-k Word Continuous Speech Recognition

  何 光霽, 宮本 優貴, 松田 薫平, 和泉 慎太郎, 川口 博, 吉本 雅彦

  本稿では，6 万語彙の実時間連続音声認識のための低消費電力 VLSI チップについて説明する．高速，高精度，低消費電力で 6 万語彙連続音声認識を実現するために，以前試作した音声認識プロセッサの提案手法を用いた上で，高並列な 8-pass Viterbi 遷移アーキテクチャを実装することで，全体処理速度のネックとなっている Viterbi 部分をさらに高速化させた．また，探索処理において第 ２ パスに tri-gram を用いることで，認識精度を bi-gram のみの場合より約 2％ 向上できた．回路規模 2.98MTr，オンチップ SRAM 容量 4.29Mbits の 6 万語彙連続音声認識のための専用プロセッサを設計し，40nｍ プロセスで試作した．bi-gram のみを使う場合，実時間処理に必要な62.51MHz 動作時の消費電力は 54.8mＷ であった．標準電圧 (1.1Ｖ) で最大 200MHz （177.4mＷ） 動作が確認され，3 倍速動作を実現できた．また，tri-gram を使う場合，200MHz で最高処理速度は 2.25 倍速であり，消費電力は 174.56mW であった．This paper describes a low-power VLSI chip for speaker-independent 60-kWord continuous speech recognition based on a context-dependent Hidden Markov Model (HMM). We implement parallel and pipelined architecture for GMM computation and Viterbi processing. It includes a 8-path Viterbi transition architecture to maximize the processing speed and adopts tri-gram language model to improve the recognition accuracy. A two-level cache architecture is implemented for the demo system. The test chip, fabricated in 40 nm CMOS technology, occupies 1.77 mm x 2.18 mm containing 2.98 M transistors for logic and 4.29 Mbit on-chip memory. The measured results show that our implementation achieves 25% required frequency reduction (62.5 MHz) and 26% power consumption reduction (54.8 mW) for 60 k-Word real-time continuous speech recognition compared to the previous work. This chip can maximally process 3.02x and 2.25x times faster than real-time at 200 MHz using the bigram and trigram language models, respectively.

  30 Sep. 2013, 研究報告システムLSI設計技術（SLDM）, 2013(7) (7), 1 - 6, Japanese


• Normally-Off Computing: 4. Normally-off Computing Techniques for Wearable Healthcare Systems

  藤森 敬和, 和泉 慎太郎, 川口 博, 志賀 利一, 吉本 雅彦

  本稿ではウェアラブルな貼り付け型生体情報計測センサにおける課題と，生体信号計測のためのノーマリーオフコンピューティング手法について解説する．また，本研究で試作した貼り付け型生体情報計測センサLSIを紹介する．常時計測可能な貼り付け型生体情報計測センサノードを実現するためには，センサのサイズと重量を可能な限り削減する必要がある．貼り付け型センサノードを構成する要素の内，重量に対して最も支配的な要素はバッテリであり，ノーマリーオフコンピューティングによってセンサLSIの消費電力を極限まで削減することを目指している．

  情報処理学会 ; 1960-, 15 Jun. 2013, 情報処理, 54(7) (7), 677 - 682, Japanese


• Introducing Multiple Microphone Arrays for Enhancing Smart Home Voice Control

  Shimpei Soda, Masahide Nakamura, Shinsuke Matsumoto, Shintaro Izumi, Hiroshi Kawaguchi, Masahiko Yoshimoto

  We have previously developed a voice control system for a home network system (HNS), using a microphone array technology. Although the microphone array achieved a convenient hands-free controller, a single array had limitations on coverage of sound collection and speech recognition rate. In this paper, we try to overcome the limitations by increasing the number of the microphone arrays. Specifically, we construct a microphone array network using four separate arrays, and enhance algorithms of sound source localization (SSL) and sound source separation (SSS) on the network. We also conduct an experimental evaluation, where precision of SSL and speech recognition rate are evaluated in a real HNS test-bed. As a result, it is shown that the usage of multiple arrays significantly improves the coverage and speech recognition ratio, compared with the previous system.

  The Institute of Electronics, Information and Communication Engineers, Jan. 2013, 電子情報通信学会技術研究報告, 112(388) (388), 19 - 24, English


• 2.5 Soft-Error Tolerant SRAM Cell Layout(2. Radiation-Induced Soft Errors,Dependable VLSI System)

  KAWAGUCHI Hiroshi, YOSHIMOTO Shusuke, OKUMURA Shunsuke, Amashita TAKURO, IZUMI Shintaro, YOSHIMOTO Masahiko

  Reliability Engineering Association of Japan, 2013, The Journal of Reliability Engineering Association of Japan, 35(8) (8), 432 - 432, Japanese


• トクシュウ チイキハツ 、 モノ ズクリ サンギョウ ノ サイセイ

  和泉 慎太郎

  北海道東北地域経済総合研究所, 2013, NETT : North East Think Tank of Japan, (80) (80), 19 - 21, Japanese


• Instantaneous Heart Rate Detection Using Short-Time Autocorrelation for Wearable Healthcare Systems

  YAMASHITA Ken, NAKANO Masanao, KONISHI Toshihiro, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  This report describes a robust method of Instantaneous Heart Rate (IHR) detection from noisy electrocardiogram (ECG) signals. Generally, the IHR is calculated from the interval of R-waves. Then, the R-waves are extracted from the ECG using a threshold. However, in wearable biosignal monitoring systems, various noises (e.g. muscle artifacts from myoelectric signals, electrode motion artifacts) increase incidences of misdetection and false detection because the power consumption and electrode distance of the wearable sensor are limited to reduce its size and weight. To prevent incorrect detection, we use a short-time autocorrelation technique. The proposed method uses similarity of the waveform of the QRS complex. Therefore, it has no threshold calculation Process and it is robust for noisy environment. By the proposed method, it is possible to reduce power consumption of Analog Front End and relax the performance requirements of the electrodes because IHR is calculated by digital signal processing.

  The Institute of Electronics, Information and Communication Engineers, 10 Dec. 2012, Technical report of IEICE. ICD, 112(365) (365), 27 - 27, Japanese


• C-12-3 Bit Error Rate Estimation SRAM Considering Temperature Fluctuation

  Kitahara Yuki, Kagiyama Yuki, Okumura Shunsuke, Yanagida Koji, Yoshimoto Shusuke, Nakata Yohei, Izumi Shintaro, Kawaguchi Hiroshi, Yoshimoto Masahiko

  The Institute of Electronics, Information and Communication Engineers, 06 Mar. 2012, Proceedings of the IEICE General Conference, 2012(2) (2), 75 - 75, Japanese


• Handsfree Voice Interface for Home Network Service Using a Microphone Array Network

  SODA Shimpei, NAKAMURA Masahide, MATSUMOTO Shinsuke, MATSUBARA Noriyuki, KUGATA Koji, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  The voice control is a promising user interface for the home network system (HNS). In our previous interface, a user had to be equipped with an actual microphone device, which imposed a burden on the user. This paper presents a hands-free voice interface using a microphone array network. The microphone array network enables voice quality enhancement, as well as sound source localization, by networking multiple microphone arrays. Attaching the arrays to the walls or ceiling, users can input voice operations to the HNS from anywhere in the room, without being aware of the microphone devices. We implement a prototype system with a 16ch microphone array, and evaluate the accuracy of speech recognition, sound source localization, and voice activity detection in a real home network environment. The hands-free operation service and automatic speech logging service are implemented as practical services.

  The Institute of Electronics, Information and Communication Engineers, 06 Mar. 2012, Technical report of IEICE. SS, 111(481) (481), 73 - 78, Japanese

  Report scientific journal


• A 75-Variable MIQP Solver Processor for Real-Time Robot Control

  NISHINO Masanori, NOGUCHI Hiroki, SHIMAI Yusuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  This paper describes a low-power eight-core Mixed Integer Quadric Programming (MIQP) solver processor VLSI for real-time autonomous robot control. It features an eight-core architecture with operation-level and task-level parallel processing using speculative execution to solve a 75-variable MIQP problem within 100 ms. The VLSI, containing 12.2 M transistors and occupying 2.7×3.0 mm2 area, was designed and fabricated using 40-nm CMOS technology. It consumes 568 mW with 135 MHz operation, allowing real-time, low-power capability for a 75-variable MIQP solver.

  The Institute of Electronics, Information and Communication Engineers, 19 Jan. 2012, Technical report of IEICE. ICD, 111(388) (388), 103 - 107, Japanese


• A 75-Variable MIQP Solver Processor for Real-Time Robot Control

  西野 允雅, 野口 紘希, 嶋井 優介, 和泉 慎太郎, 川口 博, 吉本 雅彦

  本研究では，自律ロボット制御のための実時間混合整数2次計画（MIQP）問題ソルバープロセッサVLSIを提案する．実時間でのMIQP問題求解のために，演算レベルとタスクレベルにおける2つの並列化手法を提案し，8コアによる並列処理アーキテクチャを実現した．40nmCMOSプロセスを用いて提案プロセッサの試作を行い，動作周波数135MHｚ，消費電力568mWにおいて75変数MIQP問題を100ms以内に求解できることを確認した．This paper describes a low-power eight-core Mixed Integer Quadric Programming (MIQP) solver processor VLSI for real-time autonomous robot control. It features an eight-core architecture with operation-level and task-level parallel processing using speculative execution to solve a 75-variable MIQP problem within 100 ms. The VLSI, containing 12.2 M transistors and occupying 2.7 × 3.0 mm2 area, was designed and fabricated using 40-nm CMOS technology. It consumes 568 mW with 135 MHz operation, allowing real-time, low-power capability for a 75-variable MIQP solver.

  12 Jan. 2012, 研究報告計算機アーキテクチャ（ARC）, 2012(19) (19), 1 - 5, Japanese


• A 284-uW 1.85-GHz 20-Phase Oscillator Using Transfer Gate Phase Couplers

  OKUNO Keisuke, KONISHI Toshihiro, LEE Hyeokiong, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  We propose a transfer gate phase coupler for a low-power multi-phase oscillator (MPOSC). The phase coupler is an nMOS transfer gate, which does not waste charge to the ground and thus achieves low power. The proposed MPOSC can set the number of outputs to an arbitrary number. The test circuit in a 180-nm process and a 65-nm process exhibits 20 phases, including 90° different angles. The designs in a 180-nm CMOS process and a 65-nm CMOS process were fabricated to confirm its process scalability; in the respective designs, we observed 36.6% and 38.3% improvements in a power-delay products, compared with the conventional MPOSCs using inverters and nMOS latches. In a 65-nm process, the measured DNL and 3a periodjitter are, respectively, less than ±1.22° and 5.82 ps. The power is 284μW at 1.85 GHz.

  The Institute of Electronics, Information and Communication Engineers, 08 Dec. 2011, Technical report of IEICE. ICD, 111(352) (352), 149 - 154, Japanese


• Data-Intensive Sound Acquisition System with Large-scale Microphone Array

  Hiroki Noguchi, Tomoya Takagi, Koji Kugata, Shintaro Izumi, Masahiko Yoshimoto, Hiroshi Kawaguchi

  We propose a microphone array network that realizes ubiquitous sound acquisition. Several nodes with 16 microphones are connected to form a novel huge sound acquisition system, which carries out voice activity detection (VAD), sound source localization, and sound enhancement. The three operations are distributed among nodes. Using the distributed network, we produce a low-traffic data-intensive array network. To manage node power consumption, VAD is implemented. The system uses little power when speech is not active. For sound localization, a network-connected multiple signal classification (MUSIC) algorithm is used. The experimental result of the sound-source enhancement shows a signal-noise ratio (SNR) improvement of 7.75dB using 112 microphones. Network traffic is reduced by 99.11% when using 1,024 microphones.We propose a microphone array network that realizes ubiquitous sound acquisition. Several nodes with 16 microphones are connected to form a novel huge sound acquisition system, which carries out voice activity detection (VAD), sound source localization, and sound enhancement. The three operations are distributed among nodes. Using the distributed network, we produce a low-traffic data-intensive array network. To manage node power consumption, VAD is implemented. The system uses little power when speech is not active. For sound localization, a network-connected multiple signal classification (MUSIC) algorithm is used. The experimental result of the sound-source enhancement shows a signal-noise ratio (SNR) improvement of 7.75dB using 112 microphones. Network traffic is reduced by 99.11% when using 1,024 microphones.

  15 Mar. 2011, 情報処理学会論文誌, 52(3) (3), 1102 - 1113, English


• A Feasibility Study of Home Services Using a Microphone Array Network

  祖田心平, 松本真佑, 中村匡秀, 和泉慎太郎, 川口博, 吉本雅彦

  The home network system (HNS), which provides value-added services by orchestrating networked home appliances, equipments and sensors, attracts great attention to realize the next-generation smart home. Implementing the location-aware services within the the HNS context is one of greatest challenges, where the appropriate services are performed based according to the location of the inhabitants. We have been studying the technologies of sound source localization and sound source separation using networked multiple microphone arrays. In this paper, we conduct a feasibility study of applying the microphone array network to the location-aware services within the HNS. Specifically, we first present three kinds of home services using illustrative examples. We then enumerate three kinds of requirements (accuracy requirement, installation requirement, user requirement), which are essential for implementing the location-aware home services using the microphone array network. In a preliminary experiment, we evaluate the accuracy requirement using an actual microphone array. Moreover, we conduct a directivity shape simulation assuming multiple arrays.

  The Institute of Electronics, Information and Communication Engineers, 2011, 電子情報通信学会技術研究報告, 111(255(CPSY2011 25-41)) (255(CPSY2011 25-41)), 61 - 66, Japanese

  Report scientific journal


• Data-Intensive Sound Acquisition with Data Aggregation Protocol for Microphone Array Networks

  和泉 慎太郎, 野口 紘希, 高木 智也

  情報処理学会, Dec. 2010, 情報処理学会研究報告, 2010(4) (4), 6p, Japanese


• Data-Intensive Sound Acquisition with Data Aggregation Protocol for Microphone Array Networks

  IZUMI Shintaro, NOGUCHI Hiroki, TAKAGI Tomoya, KUGATA Koji, SODA Shinpei, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi

  We propose a microphone array network that realizes ubiquitous sound acquisition. A number of nodes with sixteen microphones are connected to form a novel huge sound acquisition system, which carries out VAD (voice activity detection), sound source localization and separation. The three operations are distributed among nodes with multi-hop network. Using the distributed network, we achieve a low-traffic data-intensive array network.

  The Institute of Electronics, Information and Communication Engineers, 28 Sep. 2010, IEICE technical report, 110(217) (217), 95 - 100, Japanese


• A 58-uW Sensor Node LSI with Synchronous MAC Protocol

  S. Izumi, T. Takeuchi, T. Matsuda, H. Lee, T. Konishi, K. Tsuruda, Y. Sakai, C. Ohta, H. Kawaguchi, M. Yoshimoto

  Sep. 2010, Proceedings of Asia-aPacific Radio Science Conference (AP-RASC), English

  [Refereed]

  Others


• 分散処理を用いた超低消費電力ネットワーク型マイクロホンアレーの研究

  祖田心平, 久賀田耕史, 高木智也, 和泉慎太郎, 野口紘希, 吉本雅彦, 川口博

  2010, 日本音響学会研究発表会講演論文集(CD-ROM), 2010


• A 58-μW Single-Chip Sensor Node Processor Using Synchronous MAC Protocol

  IZUMI Shintaro, TAKEUCHI Takashi, MATSUDA Takashi, LEE Hyeokjong, KONISHI Toshihiro, TSURUDA Koh, SAKAI Yasuharu, KAWAGUCHI Hiroshi, OHTA Chikara, YOSHIMOTO Masahiko

  In this paper, we propose a single-chip ultra low-power sensor node processor with a synchronous media access control (MAC). It is comprised of a transceiver, i8051 micro processor, and dedicated MAC processor. The test chip occupies 3x3mm^2 in a 180-nm CMOS process, including 1.38M transistors. The power is 58.0μW under a network environment.

  The Institute of Electronics, Information and Communication Engineers, 24 Sep. 2009, IEICE technical report, 109(214) (214), 141 - 145, Japanese


• Isochronous MAC Protocol for Low-Power Wireless Sensor Node VLSI

  IZUMI Shintaro, MATSUDA Takashi, TAKEUCHI Takashi, KAWAGUCHI Hiroshi, OHTA Chikara, YOSHIMOTO Masahiko

  In this paper, we propose the isochronous media access control (I-MAC) processor by cross layer design. The I-MAC can be simplified because all nodes are synchronized and predict their operations. And then, the time synchronization system is implemented in physical layer. Hence, a simple processor for the I-MAC can be implemented as dedicated hardware. As well, the power management module (PMM) controls the power supplies of the components, based on the I-MAC state transition of I-MAC processor. The proposal processor achieves a power of 10.93uW. The chip area is 200x200um2 in a 180-nm CMOS process.

  The Institute of Electronics, Information and Communication Engineers, 24 Feb. 2009, IEICE technical report, 108(457) (457), 177 - 182, Japanese


• A 58-μW Single-Chip Sensor Node Processor Using Synchronous MAC Protocol

  Izumi Shintaro, Yoshimoto Masahiko, Takeuchi Takashi, Matsuda Takashi, Lee Hyeokjong, Konishi Toshihiro, Tsuruda Koh, Sakai Yasuharu, Kawaguchi Hiroshi, Ohta Chikara

  In this paper, we propose a single-chip ultra low-power sensor node processor with a synchronous media access control (MAC). It is comprised of a transceiver, i8051 micro processor, and dedicated MAC processor. The test chip occupies 3x3mm^2 in a 180-nm CMOS process, including 1.38M transistors. The power is 58.0μW under a network environment.

  The Institute of Image Information and Television Engineers, 2009, ITE Technical Report, 33(0) (0), 141 - 145, Japanese


• Variable bandwidth digital bandpass filter for cognitive radio

  TSURUDA Koh, IZUMI Shintaro, LEE Hyeokjong, TAKEUCHI Takashi, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  本論文ではコグニティブ無線向け可変帯域ディジタルBPF(Band-Pass Filter)を用いたベースバンドプロセッサを提案する.BPFにDA(Distributed Arithmetic)アルゴリズムを適応することで,内蔵するSRAMのデータを書き換えるだけでBPFの特性(チャネル中心周波数とバンド幅)を変化させることが可能となる.試作したベースバンドプロセッサではバンド幅を40kHzから240kHzまで10kHz単位で変化させることが可能である.CMOS 180nmプロセスで設計し,電源電圧1.8Vで消費電力は13.5mWであった.

  The Institute of Electronics, Information and Communication Engineers, 15 Oct. 2008, IEICE technical report, 108(253) (253), 137 - 141, Japanese


• B-20-10 Study on Divided Static Random Access Memory Considering Data Aggregation for Wireless Sensor Nodes

  Sakai Yasuharu, Matsuda Takashi, Izumi Shintaro, Takeuchi Takashi, Fujiwara Hidehiro, Kawaguchi Hiroshi, Ohta Chikara, Yoshimoto Masahiko

  The Institute of Electronics, Information and Communication Engineers, 02 Sep. 2008, Proceedings of the Society Conference of IEICE, 2008(2) (2), 346 - 346, Japanese


• Variable bandwidth digital bandpass filter for cognitive radio

  Tsuruda Koh, Izumi Shintaro, Lee Hyeokjong, Takeuchi Takashi, Kawaguchi Hiroshi, Yoshimoto Masahiko

  本論文ではコグニティブ無線向け可変帯域ディジタルBPF(Band-Pass Filter)を用いたベースバンドプロセッサを提案する.BPFにDA(Distributed Arithmetic)アルゴリズムを適応することで,内蔵するSRAMのデータを書き換えるだけでBPFの特性(チャネル中心周波数とバンド幅)を変化させることが可能となる.試作したベースバンドプロセッサではバンド幅を40kHzから240kHzまで10kHz単位で変化させることが可能である.CMOS 180nmプロセスで設計し,電源電圧1.8Vで消費電力は13.5mWであった.

  The Institute of Image Information and Television Engineers, 2008, ITE Technical Report, 32(0) (0), 137 - 141, Japanese


• A-21-26 Improvement of Counter-based Broadcasting for Wireless Sensor Networks using Timer Control

  IZUMI S., MATSUDA T., MIKAMI S., KAWAGUCHI H., OHTA C., YOSHIMOTO M.

  The Institute of Electronics, Information and Communication Engineers, 07 Mar. 2007, Proceedings of the IEICE General Conference, 2007, 417 - 417, Japanese

• 第6章第1節 ウェアラブル生体センサ

  IZUMI Shintaro

  Others, シーエムシー出版, 2017, Japanese

  Scholarly book


• Normally-Off Computing

  NAKADA Takashi, FUJITA Shinobu, HAYASHIKOSHI Masanori, IZUMI Shintaro, FUJIMORI Yoshikazu, NAKAMURA Hiroshi

  Joint work, Springer Japan, 2017, English

  Scholarly book


• 第7章第3節 ウェアラブル生体センサの低消費電力化とノーマリーオフ技術," ウェアラブルデバイスの小型、薄型化と伸縮、柔軟性の向上技術 pp. 364-374

  IZUMI SHINTARO

  Others, 技術情報協会, Dec. 2015, Japanese

  General book

• 光電式容積脈波法による脈拍測定の低消費電力化手法

  WATANABE Kento, IZUMI Shintaro, YANO Yuji, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  ヘルスケア・医療情報通信技術研究会（MICT）, Jan. 2019, Japanese, 電子情報通信学会, 東京都千代田区明治大学駿河台キャンパス, Domestic conference

  Oral presentation


• ウェアラブルデバイスのための心拍変動モニタリングにおけるサンプリングレート低減手法

  NISHIKAWA Yuki, IZUMI Shintaro, YANO Yuji, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  第35回「センサ・マイクロマシンと応用システム」シンポジウム, Oct. 2018, Japanese, 電気学会 センサ・マイクロマシン部門, 北海道札幌市 札幌市民交流プラザ, Domestic conference

  Poster presentation


• ウェアラブルデバイスのための圧電素子を用いたマルチモーダルな心血管情報の計測

  OKANO Takaaki, IZUMI Shintaro, KATSUURA Takumi, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  第34回「センサ・マイクロマシンと応用システム」シンポジウム，01am2-PS-135，広島，2017年11月1日, Nov. 2017, Japanese, Domestic conference

  Oral presentation


• 消化管内への留置を目的とした飲み込み型デバイスの検討

  NAKAMURA Ryota, IZUMI Shintaro, KAWAGUCHI Hiroshi, OHTA Hidetoshi, YOSHIMOTO Masahiko

  第34回「センサ・マイクロマシンと応用システム」シンポジウム，31pm3-PS-46，広島，2017年10月31日, Oct. 2017, Japanese, Domestic conference

  Oral presentation


• ノイズフィードバック技術を用いたウェアラブル向け容量結合型心電センサ

  NAGASATO Yuki, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  IEICEソサイエティ大会, 2017年9月12-15日，東京, Sep. 2017, Japanese, Domestic conference

  Oral presentation


• 選択的ソース線駆動方式を用いた画像処理プロセッサ向け低消費電力28nm FD-SOI 8TデュアルポートSRAM

  MORI Haruki, NAKAGAWA Tomoki, KITAHARA Yuki, KAWAMOTO Yuta, TAKAGI Kenta, YOSHIMOTO Shusuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  LSIとシステムのワークショップ2017 ポスターセッション, 東京, 2017年5月, May 2017, Japanese, Domestic conference

  Oral presentation


• マイクロ波ドップラーセンサを用いた車両走行中の心拍計測手法

  MATSUNAGA DAICHI, IZUMI SHINTARO, KAWAGUCHI HIROSHI, YOSHIMOTO MASAHIKO

  電子情報通信学会総合大会，B-20-10, 名古屋, 2017年3月22日., Mar. 2017, Japanese, 名古屋, Domestic conference

  Oral presentation


• 日常生活の常時モニタリングを実現する生体情報計測技術

  IZUMI SHINTARO

  第33回「センサ・マイクロマシンと応用システム」シンポジウム, Oct. 2016, Japanese, 平戸, Domestic conference

  [Invited]

  Invited oral presentation


• プロセスばらつき耐性を有する低電圧動作STT-MRAM向けカウンターベース読出し回路

  UMEKI YOHEI, YANAGIDA KOUJI, YOSHIMOTO SHUSUKE, IZUMI SHINTARO, YOSHIMOTO MASAHIKO, KAWAGUCHI HIROSHI, TSUNODA KOJI, SUGII TOSHIHIRO

  LSIとシステムのワークショップ2016, May 2016, Japanese, Domestic conference

  Poster presentation


• 消化管内に留置可能な飲み込み型生体センサー

  IZUMI Shintaro, NAKAMURA Ryota, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  電子情報通信学会総合大会, Mar. 2016, Japanese, 福岡, Domestic conference

  Oral presentation


• Process variation tolerant counter base read circuit for low-voltage operating STT-MRAM

  UMEKI Yohei, YANAGIDA Koji, KUROTSU Hiroaki, KITAHARA Hiroto, MORI Haruki, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi, YOSHIMOTO Shusuke, TSUNODA Koji, SUGII Toshihiro

  DATE EMS Workshop, Mar. 2016, English, Dresden,Germany, International conference

  Poster presentation


• Design and testing of a low-power wearable sensor SoC

  IZUMI Shintaro

  29thIEEE International Conference on Microelectronic Test Structures(ICMTS), Mar. 2016, Japanese, 横浜, Domestic conference

  Public discourse


• ウェアラブルヘルスケア応用超低消費電力SoCの開発

  IZUMI Shintaro

  応用物理学会東海支部50周年記念研究会「バイオメディカルエレクトロニクス」, Dec. 2015, Japanese, 名古屋, Domestic conference

  [Invited]

  Invited oral presentation


• Analysis of Soft Error Propagation considering Masking Effects on Re-convergent Path

  KIMI Yuta, MATSUKAWA Go, YOSHIDA Shuhei, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  IEEE Asian Test Symposium (ATS), Nov. 2015, English, International conference

  Oral presentation


• A 298-fJ/writecycle 650-fJ/readcycle 8T Three-Port SRAM in 28-nm FD-SOI Process Technology for Image Processor

  MORI Haruki, NAKAGAWA Tomoki, KITAHARA Yuki, KAWAMOTO Yuta, TAKAGI Kenta, YOSHIMOTO Shusuke, IZUMI Shintaro, Nii Koji, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  IEEE Custom Integrated Circuits Conference (CICC), Sep. 2015, English, International conference

  Oral presentation


• 低SNR環境向け心拍抽出アルゴリズム

  MATSUNAGA Daichi, KAWAMOTO Yuta, NAKAI Yozaburo, OKUNO Keisuke, IZUMI Shintaro, YOSHIMOTO Masahiko

  LSIとシステムのワークショップ2015, May 2015, Japanese, 小倉, Domestic conference

  Poster presentation


• 時間デジタル変換器を用いたIOサイズ8bitAD変換器

  OKUNO Keisuke, 小西恵大, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi

  LSIとシステムのワークショップ2015 ポスターセッション, May 2015, Japanese, 小倉, Domestic conference

  Poster presentation


• ウェアラブル心電図計測SoC

  TANAKA Yoshito, NAKAI Yozaburo, KAWAMOTO Yuta, OKUNO Keisuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, KIMURA Hiromitsu, MURAMOTO Kyoji, FUCHIKAMI Takaaki, FUJIMORI Yoshikazu, YOSHIMOTO Masahiko

  LSIとシステムのワークショップ2015, May 2015, Japanese, 小倉, Domestic conference

  Poster presentation


• 6T4C型低消費電力不揮発メモリ

  KITAHARA Hiroto, NAKAGAWA Tomoki, IZUMI Shintaro, TANAGIDA Kouji, KITAHARA Yuki, YOSHIMOTO Shusuke, UMEKI Yohei, MORI Haruki, KAWAGUCHI Hiroshi, KIMURA Hiromitsu, MURAMOTO Kyoji, FUCHIKAMI Takaaki, FUJIMORI Yoshikazu, YOSHIMOTO Masahiko

  LSIとシステムのワークショップ2015, May 2015, Japanese, 小倉, Domestic conference

  Poster presentation


• 温度補償回路を用いた高速セットリングADPLL

  奥野 圭祐, 正木 何奈, IZUMI SHINTARO, KAWAGUCHI HIROSHI, YOSHIMOTO MASAHIKO

  第37回アナログRF研究会, Dec. 2014, Japanese, Domestic conference

  Oral presentation


• 低消費電力貼り付け型センサのためのテンプレートマッチングを用いたロバスト心拍抽出手法の開発

  中井 陽三郎, IZUMI SHINTARO, 中野 将尚, 山下 顕, 藤井 貴英, KAWAGUCHI HIROSHI, YOSHIMOTO MASAHIKO

  第31回「センサ・マイクロマシンと応用システム」シンポジウム, Oct. 2014, Japanese, Domestic conference

  Oral presentation


• 磁性変化型メモリの書き込み高速化メモリアーキテクチャ

  森 陽紀, 柳田 晃司, 梅木 洋平, 吉本秀輔, IZUMI SHINTARO, KAWAGUCHI HIROSHI, YOSHIMOTO MASAHIKO, 角田 浩司, 杉井 寿博

  LSIとシステムのワークショップ2014 ポスターセッション, May 2014, Japanese, 電子情報通信学会集積回路研究専門委員会, 小倉, Domestic conference

  Poster presentation


• 温度補償回路を用いた高速セットリングADPLL

  正木 何奈, 奥野 圭祐, IZUMI SHINTARO, KAWAGUCHI HIROSHI, YOSHIMOTO MASAHIKO

  LSIとシステムのワークショップ2014 ポスターセッション, May 2014, Japanese, 電子情報通信学会集積回路研究専門委員会, 小倉, Domestic conference

  Poster presentation


• 38μAウェアラブル生体情報計測プロセッサ

  中井 陽三郎, IZUMI SHINTARO, 山下 顕, 中野 将尚, 藤井 貴英, 小西 恵大, KAWAGUCHI HIROSHI, 木村 啓明, 丸元 共治, 渕上 貴昭, 藤森 敬和, 中嶋 宏, 志賀 利一, YOSHIMOTO MASAHIKO

  LSIとシステムのワークショップ2014 ポスターセッション, May 2014, Japanese, Domestic conference

  Poster presentation


• ロバストな瞬時心拍抽出機能を有する低消費電力ウェアラブルヘルスケアシステム

  IZUMI Shintaro, NAKANO Masanao, YAMASHITA Ken, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  第14回計測自動制御学会システムインテグレーション部門講演会SI2013, Dec. 2013, Japanese, 神戸市, Domestic conference

  [Invited]

  Invited oral presentation


• 読出しビット線振幅制限機構及び読み出し加速回路を備えた8T SRAM

  UMEKI Yohei, YOSHIMOTO Shusuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  LSIとシステムのワークショップ2013, May 2013, Japanese, 北九州市, Domestic conference

  Poster presentation


• 核反応シミュレータを用いたソフトエラー率導出ツール及び耐マルチビットエラー6T SRAM

  YOSHIMOTO Shusuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  LSIとシステムのワークショップ2013, May 2013, Japanese, 北九州市, Domestic conference

  Poster presentation


• HDTV解像度対応 実時間HOG特徴量抽出と複数物体検出を実現する43mWデュアルコアプロセッサ

  TKAGI Kenta, MIZUNO Kosuke, IZUMI Shintaro, KAWAGUCHI Hiroshi, YOSHIMOTO Masahiko

  LSIとシステムのワークショップ2013, May 2013, Japanese, 北九州市, Domestic conference

  Poster presentation


• 65nm 700-μm2 61-dB 低ジッター2次ΔΣT-D変換器

  OKUNO Keisuke, KONISHI Toshihiro, IZUMI Shintaro, YOSHIMOTO Masahiko, KAWAGUCHI Hiroshi

  LSIとシステムのワークショップ2013, May 2013, Japanese, 北九州市, Domestic conference

  Poster presentation


• ウェアラブルヘルスケアシステムのための 短時間自己相関を用いた瞬時心拍検出手法

  中野将尚, 小西恵大, 和泉慎太郎, 川口博, YOSHIMOTO MASAHIKO

  電気学会センサ・マイクロマシン部門大会, Oct. 2012, Japanese, 北九州, Domestic conference

  Public symposium


• 6万語彙実時間連続音声認識のための40nm, 144mW音声認識専用プロセッサの開発

  何光霽, 菅原隆伸, 藤永剛史, 宮本優貴, 野口紘希, 和泉慎太郎, 川口博, YOSHIMOTO MASAHIKO

  LSIとシステムのワークショップ 2012, May 2012, Japanese, 北九州, Domestic conference

  Poster presentation


• 40nm 640μm2 7.2bit プロセススケーラブル・オペアンプレス時間演算型AD変換器

  小西恵大, 奥野圭祐, 和泉慎太郎, 吉本雅彦, KAWAGUCHI HIROSHI

  LSIとシステムのワークショップ 2012, May 2012, Japanese, 北九州, Domestic conference

  Poster presentation

• Measurement and visualization of organ activity using a flexible multi-channel electrode sheet and a generative model

  和泉 慎太郎, 荒木 徹平, 村瀬 翔

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2023 - 31 Mar. 2026


• 空間超音波を用いた非接触バイタル計測技術

  和泉 慎太郎

  日本学術振興会, 科学研究費助成事業, 挑戦的研究(萌芽), 神戸大学, 30 Jun. 2023 - 31 Mar. 2025


• Research on optical devices and integration technology to realize flexible sheet sensors enabling spectral analysis

  荒木 徹平, 和泉 慎太郎, 河野 行雄

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Osaka University, 01 Apr. 2022 - 31 Mar. 2025


• Development of sheet-type pulse wave sensor system and visualization of blood flow networks

  Sekitani Tsuyoshi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Osaka University, 01 Apr. 2019 - 31 Mar. 2022

  In this research, we have developed a "patch-type blood flow sensor system" that enables quantitative wireless measurement of the human "blood flow network" using a flexible biometric signal measuring sheet. By simply affixing the patch to the body, we were able to realize a "flexible multi-point pulse wave sensor system" that can simultaneously measure pulse waves at multiple points and estimate "arterial stiffness" and "blood flow network" based on the pulse wave propagation velocity. The results were published in Nature Communicaitons, the world's most prestigious international academic journal, and attracted worldwide attention as a new sheet-type medical system.


• Stretchable photodetector fabricated by wet-process and its application toward imaging system

  Araki Teppei

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Osaka University, 01 Apr. 2019 - 31 Mar. 2022

  Metallic nanomaterials and carbon nanotubes can realize functional devices that exhibit mechanical flexibility previously unattainable due to the specificity of nanomaterials while showing a high degree of compatibility with wet processes. With the goal of "wet process formation of stretchable light sensor elements using nanomaterials and applying them to imaging systems," this study attempted to create high-performance and highly functional light sensor elements by gaining a fundamental understanding of charge transport occurring between nanomaterials. As a result, we constructed a wet process-based sensor sheet with stretchable wiring and a multi-channel light sensor, and furthermore, established an imaging system and investigated its practical feasibility.


• Non-Contact Biometric Identification and Authentication Using Microwave Doppler Sensor

  Izumi Shintaro

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory), 大阪大学, 29 Jun. 2018 - 31 Mar. 2021, Principal investigator

  In this study, we proposed a method for biometric authentication using individual differences in heartbeats measured without contact. A microwave Doppler sensor was used to measure minute vibrations on the body surface to extract heartbeat. Because there are individual differences in the pattern of heartbeats, the proposed method can identify individuals using a machine learning approach. We also showed that the effect of noise can be reduced by using time-frequency analysis. The evaluation results show that 96.15% accuracy was achieved.

  Competitive research funding


• Non-contact biometric sensor system with high accuracy and usability

  Izumi Shintaro

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A), Grant-in-Aid for Young Scientists (A), 01 Apr. 2016 - 31 Mar. 2020, Principal investigator

  To realize a continuous biological signal monitoring, non-contact heart beat sensing systems have been developed. A appreciatively coupled Electrocardiograms sensor and a microwave Doppler sensor are studied, and they were evaluated both in the indoor and in a running vehicle environment. Furthermore, a sampling error compensation technique has been proposed to reduce these power consumption. These proposed methods are integrated to a prototype of human activity monitor system. The proposed system shows low-power consumption and high accuracy in the real environments.

  Competitive research funding


• Research and development of a sheet-type autonomic function monitoring system

  Sekitani Tsuyoshi, Uemura Takafumi, Izumi Shintaro, Araki Teppei, Noda Yuki, Yoshimoto Shusuke, Mochizuki Hideki, Murase Shou

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Osaka University, 01 Apr. 2016 - 31 Mar. 2019

  We have successfully developed sheet-type sensor systems for monitoring functions of autonomic nervous system. This system consists of sheet-type electroencephalogram (EEG), electrocardiogram (ECG), electromyogram (EMG), and sweat sensors. For the realization of imperceptible electronic system, almost all the component has been manufactured on flexible and stretchable substrates, so that it can spread over arbitrary curved surfaces including human skins. With integrating the ultrafsoft gel electrodes, ultraflexible amplifier, Si-LSI platform consisting of wireless data-transmission module and analog-to-digital converter, Li-ion-based thin-film battery, and information engineering.The collaboration with medical doctors in Osaka University Medical Hospital, we have successful monitored the functions of autonomic nervous system using the developed systems, demonstrating the excellent feasibility of the newly-developed sheet-type system.


• Research on nursing staffing for guaranteeing perinatal safety and quality in obstetrics mixed ward

  SAITO IZUMI, Izumi Shintaro, Nishi Motoi, Matsuo Takami, Yamada Hideto

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2015 - 31 Mar. 2018

  In the obstetrics mixed ward, it was investigated whether the nursing of non- obstetrics dead patients and the nursing of obstetrics deliveries overlap. In 14 of the 22 deaths, nursing at birth and delivery at delivery were overlapped. There were 4 out of 14 overlaps within 60 minutes. One of them was two minutes apart. From these results, it became clear that the measurement of the whole obstetrics mixed ward and the 24-hour nursing hours and the nursing practice using the information communication equipment is indispensable. The obstetrics one bedside average stay time 17.3 minutes, the non-obstetric one bedside average stay time 39 minutes, the one bedside average of all the patients was 21.6 minutes. Elucidation of the actual condition of nursing of obstetrics mixed ward is in the present condition that is hardly realized


• Swallowable Sensing Device for Long-term Gastrointestinal Tract Monitoring

  Izumi Shintaro, Ohta Hidetoshi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, Kobe University, 01 Apr. 2015 - 31 Mar. 2018, Principal investigator

  It is important to measure biological information related to a daily life to recognize and improve human lifestyles. We develop a biological tag that can be indwelled in the gastrointestinal tract and which can operate continuously for long durations by wireless power supply and communication. The conventional indwelling swallowable system uses a motor. It is not proposed as being of swallowable size. Therefore, we propose a mechanism using electrolysis, realizing a system without using a conventional actuator, but with a size that can be swallowed. A board of 7 mm × 20 mm was fabricated with a micro controller, an NFC-IC, an antenna connector, and a sensor. By printing on a flexible printed circuit board, the antenna can be folded and unfolded, which relaxes size restrictions. The communication distance was extended. Experiments using a human body model revealed that the device can be indwelled and egested in a swallowable size using the proposed method.

  Competitive research funding


• A Fast Settling ADPLL for Periodically Wake-Up Systems

  IZUMI Shintaro

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kobe University, 01 Apr. 2012 - 31 Mar. 2014, Principal investigator

  In this research, a temperature compensation technique for a digitally controlled oscillator (DCO) using least means square (LMS) filtering was proposed. The proposed scheme contributes to reduction of the start-up settling time of all-digital phase-locked loop (ADPLL). The proposed method estimates the temperature using the output frequency of DCO because it is affected by temperature fluctuation. These characteristics are confirmed using measurement results of the test chip, which is fabricated in 65-nm CMOS process.

  Competitive research funding


• 電力効率を3桁向上させるセンサネットワークのレイヤ間垂直統合研究

  和泉 慎太郎

  日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 特別研究員奨励費, 神戸大学, 2009 - 2011

  平成23年度は、昨年度に引き続きアプリケーション層までを含んだセンサネットワークの垂直統合設計研究をおこなった。 本研究ではセンサネットワークの新たな応用分野としてマイクアレイを用いる音声インタフェースに着目し、センサネットワーク技術を用いたネットワーク型マイクアレイシステムを提案している。提案システムでは、小規模なマイクアレイ・センサノード(サブアレイ)を多数配置し、それらの間で有線ネットワークを構築して協調動作をおこなうことで、従来の大規模マイクアレイにおける演算量や消費電力の問題を解決する。小規模なマイクアレイ・センサノード(サブアレイ)を多数配置し、それらの間で有線ネットワークを構築して協調動作をおこなうことで、大規模なマイクアレイ音声処理システムを実現する。従来のデータ収集のみを目的としたアプリケーションとは異なり、ネットワーク型マイクアレイシステムには「リアルタイム処理」、「センサノード間の時刻同期」、「ネットワーク分散処理」という3つの機能が必要であった。 さらに本年度の研究成果として、複数音源に対応するマイクアレイネットワークシステムのためのクラスタベース経路構築手法を提案した。提案ルーティング手法をマイクアレイネットワークに適用することで、複数の音源位置に対して効率の良い経路を構築し、各音源からの音声を同時に収集することができる。これにより、例えば複数話者に対応した音声会議システムなどが実現できる。

• 温冷触覚提示装置、ウェアラブル端末、かゆみ抑制装置、アイシング装置、マッサージ装置、口内保持具、及び食器

  伊庭野 健造, 菅原 徹, 伊藤 雄一, 佐藤 克成, 和泉 慎太郎

  特願2022-114631, 19 Jul. 2022, 大阪ヒートクール株式会社, 特開2022-159298, 17 Oct. 2022

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• 温冷触覚提示装置、ウェアラブル端末、かゆみ抑制装置、アイシング装置、マッサージ装置、口内保持具、及び食器

  伊庭野 健造, 菅原 徹, 伊藤 雄一, 佐藤 克成, 和泉 慎太郎

  特願2022-114631, 19 Jul. 2022, 大阪ヒートクール株式会社, 特開2022-159298, 17 Oct. 2022, 特許第7113586号, 28 Jul. 2022

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• 温冷触覚提示装置、ウェアラブル端末、かゆみ抑制装置、アイシング装置、マッサージ装置、口内保持具、及び食器

  伊庭野 健造, 菅原 徹, 伊藤 雄一, 佐藤 克成, 和泉 慎太郎

  JP2021046685, 17 Dec. 2021, 大阪ヒートクール株式会社, 特許第7113586号, 28 Jul. 2022

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• 咳嗽検出装置

  西村 善博, 永野 達也, 和泉 慎太郎

  特願2020-122053, 16 Jul. 2020, 国立大学法人神戸大学, 特開2022-018726, 27 Jan. 2022

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• 災害情報システム

  瀬下 雄一, 小島 浩, 栗田 哲史, 平岩 直哉, 土山 滋郎, 赤羽 省吾, 関谷 毅, 植村 隆文, 和泉 慎太郎, 荒木 徹平, 野田 祐樹, 吉本 秀輔

  特願2019-009541, 23 Jan. 2019, 東電設計株式会社, 東電タウンプランニング株式会社, 国立大学法人大阪大学, 特開2020-119231, 06 Aug. 2020

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• 災害情報システム

  瀬下 雄一, 小島 浩, 栗田 哲史, 平岩 直哉, 土山 滋郎, 赤羽 省吾, 関谷 毅, 植村 隆文, 和泉 慎太郎, 荒木 徹平, 野田 祐樹, 吉本 秀輔

  特願2019-009541, 23 Jan. 2019, 東電設計株式会社, 東電タウンプランニング株式会社, 国立大学法人大阪大学, 特開2020-119231, 06 Aug. 2020, 特許第7152718号, 04 Oct. 2022

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• 類型判別装置

  西村 善博, 永野 達也, 和泉 慎太郎

  特願2018-075034, 09 Apr. 2018, 国立大学法人神戸大学, 特開2019-180800, 24 Oct. 2019

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• 類型判別装置

  西村 善博, 永野 達也, 和泉 慎太郎

  特願2018-075034, 09 Apr. 2018, 国立大学法人神戸大学, 特開2019-180800, 24 Oct. 2019, 特許第7130228号, 26 Aug. 2022

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• 半導体記憶装置

  和泉 慎太郎, 中川 知己, 川口 博, 吉本 雅彦

  特願2019-013173, 29 Jan. 2019, ローム株式会社, 特開2019-079589, 23 May 2019

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• 半導体記憶装置

  和泉 慎太郎, 中川 知己, 川口 博, 吉本 雅彦

  特願2014-212787, 17 Oct. 2014, ローム株式会社, 特開2016-081549, 16 May 2016

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• TD変換器及びAD変換器

  川口 博, 吉本 雅彦, 小西 恵大, 和泉 慎太郎, 奥野 圭祐

  特願2012-203662, 14 Sep. 2012, 株式会社半導体理工学研究センター, 特開2014-003580, 09 Jan. 2014, 特許第5552514号, 30 May 2014

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• TD変換器及びAD変換器

  川口 博, 吉本 雅彦, 小西 恵大, 和泉 慎太郎, 奥野 圭祐

  特願2012-203662, 14 Sep. 2012, 株式会社半導体理工学研究センター, 特開2014-003580, 09 Jan. 2014

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• 位置測定システム

  川口 博, 吉本 雅彦, 祖田 心平, 高木 智也, 和泉 慎太郎

  特願2011-119072, 27 May 2011, 株式会社半導体理工学研究センター, 特開2012-247300, 13 Dec. 2012, 特許第5412470号, 15 Nov. 2013

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• センサネットワークシステムとその通信方法

  川口 博, 吉本 雅彦, 和泉 慎太郎

  特願2011-164986, 28 Jul. 2011, 株式会社半導体理工学研究センター, 特開2013-030946, 07 Feb. 2013, 特許第5289517号, 14 Jun. 2013

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• センサネットワークシステムとその通信方法

  川口 博, 吉本 雅彦, 和泉 慎太郎

  特願2011-164986, 28 Jul. 2011, 株式会社半導体理工学研究センター, 特開2013-030946, 07 Feb. 2013

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• 位置測定システム

  川口 博, 吉本 雅彦, 祖田 心平, 高木 智也, 和泉 慎太郎

  特願2011-119072, 27 May 2011, 株式会社半導体理工学研究センター, 特開2012-247300, 13 Dec. 2012

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• オペアンプレス・キャパシタレスAD変換器およびTD変換器

  川口 博, 吉本 雅彦, 小西 恵大, 和泉 慎太郎

  特願2011-108910, 14 May 2011, 株式会社半導体理工学研究センター, 特開2012-244199, 10 Dec. 2012

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