Updated on 2023/02/08

写真a

 
HORI Junichi
 
Organization
Academic Assembly Institute of Science and Technology JOUHOU DENSHI KOUGAKU KEIRETU Professor
Graduate School of Science and Technology Electrical and Information Engineering Professor
Faculty of Engineering Department of Engineering Professor
Title
Professor
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Degree

  • 博士(工学) ( 1996.6   東京工業大学 )

Research Areas

  • Life Science / Biomaterials

  • Life Science / Rehabilitation science

  • Life Science / Biomedical engineering

Research History (researchmap)

  • Niigata University   Faculty of Engineering Department of Engineering   Professor

    2017.4

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  • Niigata University   Graduate School of Science and Technology Electrical and Information Engineering   Professor

    2012.4

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  • Niigata University   Graduate School of Science and Technology Electrical and Information Engineering   Professor

    2012.4

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  • Niigata University   Faculty of Engineering Department of Biocybernetics   Professor

    2012.4 - 2017.3

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  • Niigata University   Faculty of Engineering Department of Biocybernetics   Associate Professor

    2004.4 - 2012.3

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  • Niigata University   Faculty of Engineering   Research Assistant

    1988.4 - 1997.3

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Research History

  • Niigata University   Faculty of Engineering Department of Engineering   Professor

    2017.4

  • Niigata University   Graduate School of Science and Technology Electrical and Information Engineering   Professor

    2012.4

  • Niigata University   Graduate School of Science and Technology Electrical and Information Engineering   Professor

    2012.4

  • Niigata University   Faculty of Engineering Department of Biocybernetics   Professor

    2012.4 - 2017.3

  • Niigata University   Faculty of Engineering Department of Biocybernetics   Associate Professor

    2004.4 - 2012.3

  • Niigata University   Faculty of Engineering   Research Assistant

    1988.4 - 1997.3

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Professional Memberships

  • International Society for Bioelectromagnetism

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  • Human Interface Society

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  • The Institute of Electrical Engineers of Japan

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  • Institute of Complex Medical Engineering

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  • Institute of Electronics, Information and Communication Engineers of Japan

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  • IEEE

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  • Japanese Society for Wellbeing Science and Assistive Technology

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  • Japan Human Brain Mapping Society

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Committee Memberships

  • 日本生活支援工学会   理事  

    2020.4   

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  • 日本生体医工学シンポジウム   シンポジウム論文編集委員長  

    2018.4 - 2020.3   

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  • 日本生体医工学会   甲信越支部長  

    2018.4 - 2020.3   

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  • 日本生活支援工学会   評議員  

    2018.4 - 2020.3   

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    Committee type:Academic society

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  •   甲信越支部支部長  

    2018.4 - 2020.3   

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  • 国際複合医工学会(Institute of Complex Medical Engineering)   Councilor  

    2018.1 - 2019.12   

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    Committee type:Academic society

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  •   生体医工学シンポジウム論文編集委員長  

    2017.4 - 2019.3   

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  •   生体医工学シンポジウム論文副委員長・英文誌編集委員長  

    2016.4 - 2017.3   

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  •   甲信越支部副支部長  

    2015.4 - 2020.3   

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  • 日本生活支援工学会   理事  

    2014.6 - 2016.5   

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  •   生体医工学シンポジウム2014選奨委員長  

    2014.4 - 2015.3   

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  • 日本生体医工学会   シンポジウム論文エディタ  

    2013.4   

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  • IEEE   IEEE EMBS Japan Chapter, Chair  

    2012.1 - 2013.12   

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  •   生体医工学シンポジウム2009‐2012,プログラム委員,コエディタ  

    2009.1 - 2013.3   

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  • IEEE   6th International BSI Workshop, Scientific Committee Member  

    2009.1 - 2009.7   

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  • IEEE   6th International BSI Workshop, Scientific Committee Member  

    2009.1 - 2009.7   

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  • ヒューマンインタフェース学会   論文誌特集「脳機能計測とブレイン-マシン・インターフェース」編集委員  

    2008.4 - 2010.3   

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  • IEEE   EMBS Japan Chapter Secretary  

    2008.4 - 2010.3   

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  • IEEE   EMBS Japan Chapter Secretary  

    2008.4 - 2010.3   

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  • International Society for Bioelectromagnetism   Guest Editor of Special Issue on Bioelectromagnetic Source Imaging  

    2008.1 - 2008.12   

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  • IEEE   Guest Editor of Special Issue on Bioelectromagnetic Modeling  

    2008.1 - 2008.12   

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  • IEEE   Guest Editor of Special Issue on Bioelectromagnetic Modeling  

    2008.1 - 2008.12   

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  • International Society for Bioelectromagnetism   Guest Editor of Special Issue on Bioelectromagnetic Source Imaging  

    2008.1 - 2008.12   

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  •   生体医工学シンポジウム組織委員,プログラム委員,選奨副委員長  

    2006.4 - 2006.9   

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  • 電子情報通信学会   会誌編集委員会委員[A]  

    2005.5 - 2007.5   

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    Committee type:Academic society

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  • 電子情報通信学会   信越支部評議員  

    2005.5 - 2006.5   

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  •   医療・福祉分野におけるヒューマンインターフェース研究会 幹事  

    2005.4   

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  • 電気学会   電磁界逆散乱解析調査専門委員会 委員  

    2005.4 - 2007.3   

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  • International Society for Bioelectromagnetism   Membership Committee  

    2004.4   

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  • International Society for Bioelectromagnetism   Membership Committee  

    2004.4   

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  • 日本生活支援工学会   Advisory Committee of IWBEM2004  

    2004.4 - 2004.10   

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  • Japanese Society for Wellbeing Science and Assistive Technology   Advisory Committee of IWBEM2004  

    2004.4 - 2004.10   

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  • International Society for Bioelectromagnetism   Scientific Program Committee of BEM&NFSI  

    2004.1 - 2004.6   

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  • International Society for Bioelectromagnetism   Scientific Program Committee of BEM&NFSI  

    2004.1 - 2004.6   

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  • 日本生活支援工学会   評議員  

    2003.7 - 2020.3   

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  • 日本生活支援工学会   資質委員  

    2003.7 - 2004.3   

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  • IEEE   査読委員  

    2003.4   

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  • IEEE   Reviewer  

    2003.4   

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  • 電子情報通信学会   第18回生体・生理工学シンポジウム 実行委員  

    2003.1 - 2003.12   

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  • Institute of Complex Medical Engineering   Director  

       

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Papers

  • Control of speed and direction of electric wheelchair using seat pressure mapping Reviewed

    Junichi Hori, Hiroki Ohara, Seiya Inayoshi

    Biocybernetics and Biomedical Engineering   38 ( 3 )   624 - 633   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PWN-Polish Scientific Publishers  

    An electric wheelchair controlled through seat pressure mapping was developed to accomplish hands-free operation. The seat pressure mapping resulting from a change in posture was measured using a pressure sensor array seated on the wheelchair in real time. The movements of the upper body were discriminated using template matching. The speed and direction can be controlled based on the similarities between the measured pressure distribution and five templates of neutral, forward, backward, left, and right movements. The developed interface was built into a commercial electric wheelchair. As the results of an experiment show, the proposed wheelchair can be controlled in any direction and velocity.

    DOI: 10.1016/j.bbe.2018.04.007

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  • Development of hands-free pointing device using facial electromyogram Reviewed

    Hori, J, Inakoshi T

    Proc. of 39th Annual Int. Conf. of IEEE EMBS   2017.7

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  • Analysis of mental state of athletes under pressure using electroencephalograph (EEG) Reviewed

    Gao, P, Ushiyama, Y, Hori, J, Akagawa, R, Shioiri, A, Kamijima, K, Terada, Y

    15th ITTF Sports Science Congress   2017.5

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  • Classification of tactile event-related potential elicited by Braille display for brain-computer interface Reviewed

    Junichi Hori, Naoto Okada

    BIOCYBERNETICS AND BIOMEDICAL ENGINEERING   37 ( 1 )   135 - 142   2017

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    To construct brain-computer interface (BCI), an event-related potential (ERP) induced by a tactile stimulus is investigated in this paper. For ERP-based BCI, visual or auditory information is frequently used as the stimulus. In the present study, we focus on tactile sensations to reserve their visual and auditory senses for other activities. Several patterns of mechanical tactile stimulation were applied to the index fingers of both hands using two piezo actuators that were used as a braille display. Human experiments based on the oddball paradigm were carried out. Subjects were instructed to pay attention to unusual target stimuli while avoiding other frequent non-target stimuli. The extracted features were classified by applying stepwise linear discriminant analysis. As a result, an accuracy of 85% and 60% were obtained for 2- and 4-class classification, respectively. The accuracy was improved by increasing the number of electrodes even when short stimulus intervals were used. (C) 2017 Nalecz Institute of Biocybemetics and Biomedical Engineering of the Polish Academy of Sciences. Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.bbe.2016.10.007

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  • Wireless brain-computer interface based on steady-state visual evoked potential considering user’s gaze Reviewed

    Otsuka, S, Hori, J

    Proc. of 8th Int. Workshop on Biosignal Interpretation,   2016.11

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    DOI: 10.1109/MIPRO.2016.7522174

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  • Cortical dipole Iimaging of visual evoked potential using sigmoid function-based filtering property Reviewed

    Hori, J, Takasawa, S

    Proc. of 8th Int. Workshop on Biosignal Interpretation,   2016.11

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  • High-Resolution Cortical Dipole Imaging Using Spatial Inverse Filter Based on Filtering Property Reviewed

    Junichi Hori, Shintaro Takasawa

    COMPUTATIONAL INTELLIGENCE AND NEUROSCIENCE   2016   1 - 10   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:HINDAWI LTD  

    Cortical dipole imaging has been developed to visualize brain electrical activity in high spatial resolution. It is necessary to solve an inverse problem to estimate the cortical dipole distribution from the scalp potentials. In the present study, the accuracy of cortical dipole imaging was improved by focusing on filtering property of the spatial inverse filter. We proposed an inverse filter that optimizes filtering property using a sigmoid function. The ability of the proposed method was compared with the traditional inverse techniques, such as Tikhonov regularization, truncated singular value decomposition (TSVD), and truncated total least squares (TTLS), in a computer simulation. The proposed method was applied to human experimental data of visual evoked potentials. As a result, the estimation accuracy was improved and the localized dipole distribution was obtained with less noise.

    DOI: 10.1155/2016/8404565

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  • High-Resolution Cortical Dipole Imaging Using Spatial Inverse Filter Based on Filtering Property Reviewed

    Junichi Hori, Shintaro Takasawa

    COMPUTATIONAL INTELLIGENCE AND NEUROSCIENCE   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:HINDAWI LTD  

    Cortical dipole imaging has been developed to visualize brain electrical activity in high spatial resolution. It is necessary to solve an inverse problem to estimate the cortical dipole distribution from the scalp potentials. In the present study, the accuracy of cortical dipole imaging was improved by focusing on filtering property of the spatial inverse filter. We proposed an inverse filter that optimizes filtering property using a sigmoid function. The ability of the proposed method was compared with the traditional inverse techniques, such as Tikhonov regularization, truncated singular value decomposition (TSVD), and truncated total least squares (TTLS), in a computer simulation. The proposed method was applied to human experimental data of visual evoked potentials. As a result, the estimation accuracy was improved and the localized dipole distribution was obtained with less noise.

    DOI: 10.1155/2016/8404565

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  • Development of electric wheelchair controlled by body motions estimated from seat pressure distribution Reviewed

    Hori, J, Inayoshi, S

    Proc. of 37th Annual Int. Conf. of IEEE EMBS   2015.8

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  • Brain-computer interface based on somatosensory evoked potential using braille display Reviewed

    Hori, J, Okada, N

    Proc. of 37th Annual Int. Conf. of IEEE EMBS   2015.8

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  • Development of the Obstacle Detection System Combining Orientation Sensor of Smartphone and Distance Sensor Reviewed

    Yutaka Tange, Shunsuke Takeno, Junichi Hori

    2015 37TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)   6696 - 6699   2015

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    In the existing walking support system, the range of detection is limited, and it is very difficult to detect obstacles such as a step or a hollow. Therefore, we aim at the development of a new walking support system for a visually-impaired person detecting neighboring obstacles by making use of a smartphone which is a high-performance portable information terminal. In this study, we have developed a walking support system combining the orientation sensor of the smartphone and a small distance sensor at the first stage. When we investigated its precision in detecting an obstacle, it was found that the system could detect obstacles which disturbed the walking of a visually-impaired person such as a step and a wall. We will find an appropriate key to detection to improve the detection precision of the system and make further improvements in the system by trial experiments in the future.

    DOI: 10.1109/EMBC.2015.7319929

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  • Development of EOG-Based letter input interface on hierarchical screen keyboard considering the characteristics of eye movements Reviewed

    Hori, J, Chiba, S

    Far East J. Electronics Communications   14 ( 1 )   53 - 69   2015

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    DOI: 10.17654/FJECMar2015-053-069

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  • Improvement of cortical dipole imaging based on filtering property

    Takasawa, S, Hori, J

    7th Biomed. Eng. Int. Conf.   2014.11

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  • Examination on motor imagery task for brain computer interface

    Tsunashima, T, Hori, J

    7th Biomed. Eng. Int. Conf.   2014.11

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  • Simultaneous electroencephalographic and electrocorticographic measurements of brain activity in a monkey

    Koide, M, Saito, C, Tosaka, T, Hasegawa, I, Hori, J, Iijima, A

    4th Asian Conf. Eng. Edu.   2014.10

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  • Classification of silent speech using support vector machine and relevance vector machine Reviewed

    Mariko Matsumoto, Junichi Hori

    APPLIED SOFT COMPUTING   20   95 - 102   2014.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    To provide speech prostheses for individuals with severe communication impairments, we investigated a classification method for brain computer interfaces (BCIs) using silent speech. Event-related potentials (ERPs) were recorded using scalp electrodes when five subjects imagined the vocalization of Japanese vowels, /a/, /i/, /u/, /e/, and /o/ in order and in random order, while the subjects remained silent and immobilized.
    For actualization, we tried to apply relevance vector machine (RVM) and RVM with Gaussian kernel (RVM-G) instead of support vector machine with Gaussian kernel (SVM-G) to reduce the calculation cost in the use of 19 channels, common special patterns (CSPs) filtering, and adaptive collection (AC). Results show that using RVM-G instead of SVM-G reduced the ratio of the number of efficient vectors to the number of training data from 97% to 55%. At this time, the averaged classification accuracies (CAs) using SVM-G and RVM-G were, respectively, 77% and 79%, showing no degradation. However, the calculation cost was more than that using SVM-G because RVM-G necessitates high calculation costs for optimization. Furthermore, results show that CAs using RVM-G were weaker than SVM-G when the training data were few. Additionally, results showed that nonlinear classification was necessary for silent speech classification.
    This paper serves as a beginning of feasibility study for speech prostheses using an imagined voice. Although classification for silent speech presents great potential, many feasibility problems remain. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.asoc.2013.10.023

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  • High resolution cortical dipole imaging for limited area with small number of electrodes

    Hori, J, Harada, T

    Int. Conf. Complex Med. Emg.   2014.6

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  • Localized Cortical Dipole Imaging using a Small Number of Electrodes Based on Independent Component Analysis Reviewed

    Junichi Hori, Toshiki Harada

    2014 36TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)   4936 - 4939   2014

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    The spatial resolution of scalp potential mapping is limited because of low conductivity of a skull. Cortical dipole layer imaging has been proposed as a method to visualize brain electrical activity with high spatial resolution. According to this method, about 100 electrodes were required to measure whole brain electrical activity. In the present study, we investigated simplified cortical dipole imaging with a small number of electrodes. The density of electrodes and the spatial resolution are in a trade-off relation. Thus, the number of electrodes was reduced by limiting the visualization region of interest, without lowering the density of electrodes. Moreover, independent component analysis was applied to the multiple signal sources to extract an attention signal from the other signals and noise. In simulation, even if the number of electrodes was reduced to 25, the obtained results were almost equivalent to the case with whole brain electrodes. The proposed method was applied to human experimental data of movement-related potential. We confirmed that the proposed method provided high resolution cortical dipole imaging with localized distribution.

    DOI: 10.1109/EMBC.2014.6944731

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  • Development of employment support tool for visual impaired people using smartphone

    Yoshimoto, Y, Tange, Y, Sudo, K, Hori, J

    Proc. of 34th Annual Int. Conf. of IEEE EMBS   2013.7

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  • Development of support sysem fortablet-type device using EOG Reviewed

    Kitajima, T, Tange, Y, d Hori

    Proc. of 34th Annual Int. Conf. of IEEE EMBS   2013.7

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  • 伝達行列の誤差を考慮した高精度脳内ダイポールイメージングの検討 Reviewed

    竹内浩祐, 堀潤一

    生体医工学   51 ( 1 )   24 - 30   2013.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本生体工学会  

    DOI: 10.11239/jsmbe.51.24

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  • Cortical Dipole Imaging using Truncated Total Least Squares Considering Transfer Matrix Error Reviewed

    Junichi Hori, Kosuke Takeuchi

    2013 35TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)   5410 - 5413   2013

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    Cortical dipole imaging has been proposed as a method to visualize electroencephalogram in high spatial resolution. We investigated the inverse technique of cortical dipole imaging using a truncated total least squares (TTLS). The TTLS is a regularization technique to reduce the influence from both the measurement noise and the transfer matrix error caused by the head model distortion. The estimation of the regularization parameter was also investigated based on L-curve. The computer simulation suggested that the estimation accuracy was improved by the TTLS compared with Tikhonov regularization. The proposed method was applied to human experimental data of visual evoked potentials. We confirmed the TTLS provided the high spatial resolution of cortical dipole imaging.

    DOI: 10.1109/EMBC.2013.6610772

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  • Classification of Silent Speech using Adaptive Collection Reviewed

    Mariko Matsumoto, Junichi Hori

    PROCEEDINGS OF THE 2013 IEEE SYMPOSIUM ON COMPUTATIONAL INTELLIGENCE IN REHABILITATION AND ASSISTIVE TECHNOLOGIES (CIRAT)   5 - 12   2013

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    To provide speech prostheses for individuals with severe communication impairments, we investigated a classification method for brain computer interfaces (BCIs) using silent speech. Event-related potentials (ERPs) obtained when four subjects imagined the vocalization of Japanese vowels, /a/, lit, /u/, /e/, and /o/ in order and in random order while the subjects remained silent and immobilized were recorded using Ill scalp electrodes and 3 reference electrodes. Regarding detection of the imagined voice, some problems occurred by which the related brain geometries and suitable electrodes for classifications differed between subjects. To overcome these problems, we used an adaptive collection that divided ERP data into small elements, performed evaluation relative to the elements, and selected better elements for classification. In earlier reports of studies using the common spatial patterns (CSPs) filter and support vector machines (SI/Ms), the classification accuracies (CAs) were 56-72% for the pairwise classification /a/ vs. /u/ in the case of 63 channel EEG measurement In this study, the CA was improved to 73-92% using the adaptive collection. According to the CA, 19 channel measurements were worse than 111 channel measurements, but 63 channel measurements were slightly worse that 111 channel measurements. Using 63 channel measurements, 73% of CA was achieved for all pairwise combinations of the five vowels. The average of the CAs was 85%. These results show that the proposed method exhibited great potential for use in classification of imagined voice for a speech prosthesis controller.

    DOI: 10.1109/CIRAT.2013.6613816

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  • Analysis of somatosensory evoked potential for mechanical stimuli mapped on realistic-shaped cortical surface Reviewed

    Junichi Hori, Takayoshi Kishi, Ryuta Kon

    IEEJ Transactions on Electronics, Information and Systems   133 ( 1 )   169 - 176   2013

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Electrical Engineers of Japan  

    In clinical situations, the objective evaluation of somatic sensations is expected without a patient's subjective opinions to reduce social problems such as those related to lawsuits for nerve injuries or malingering. In this study, the somatosensory evoked potential (SEP) using the mechanical stimulations of the tactile sensation was measured and analyzed in spatiotemporal domains. The cortical potential mapping projected onto the realistic-shaped model was estimated to improve the spatial resolution of the SEP maps by application of cortical dipole layer imaging. The experimentally obtained results suggest that the spatiotemporal distributions of the SEPs reflect the differences for positions, strengths, and patterns of somatosensory stimulations. © 2013 The Institute of Electrical Engineers of Japan.

    DOI: 10.1541/ieejeiss.133.169

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  • Evaluation of stroke patterns during repetitive manual wheelchair propulsion Reviewed

    Yosuke Honda, Junichi Hori

    IEEJ Transactions on Electronics, Information and Systems   132 ( 11 )   1798 - 1805   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical Engineers of Japan  

    The purpose of this study is to investigate the efficient stroke patterns of manual wheelchair propulsion in the repetition operation. The state of the muscle fatigue was evaluated using the averaged rectified value and the mean power frequency of 5-channel surface electromyograms of the upper arm and the chest. In addition, the propulsion efficiency of was estimated from the driving torque and total muscle activities. Four different stroke patterns of arcing, semicircular, single looping over propulsion, and double looping over propulsion were examined by 6 healthy male subjects. The experimental results of the subjects with muscle fatigue tendency suggested that the stroke pattern of the semicircular which draws locus an oval was the most effective in four stroke patterns because of low muscle fatigue and high proportion efficiency. © 2012 The Institute of Electrical Engineers of Japan.

    DOI: 10.1541/ieejeiss.132.1798

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  • Cortical Potential Imaging of Somatosensory Evoked Potential Induced by Mechanical Stimulation Reviewed

    Junichi Hori, Ryuta Kon

    2012 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)   4732 - 4735   2012

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    The objective evaluation of somatic sensations is expected without a patient's subjective opinions to reduce social problems such as those related to lawsuits for nerve injuries or malingering. In this study, the somatosensory evoked potential (SEP) using the mechanical stimulations of the tactile sensation was measured and analyzed in spatiotemporal domains. The cortical potential mapping projected onto the realistic-shaped model was estimated to improve the spatial resolution of the SEP maps by application of cortical dipole layer imaging. The experimentally obtained results suggest that the spatiotemporal distributions of the SEPs reflect the differences for positions, strengths, and patterns of somatosensory stimulations.

    DOI: 10.1109/EMBC.2012.6347024

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  • Cortical dipole imaging for multiple signal sources considering time-varying non-uniform noise Reviewed

    Junichi Hori, Yoshiki Watanabe

    IEEJ Transactions on Electronics, Information and Systems   131 ( 11 )   1958 - 1965   2011

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical Engineers of Japan  

    Cortical dipole imaging is one of the spatial enhancement techniques from the scalp electroencephalogram. We investigated the dipole imaging for multiple signal sources under time-varying non-uniform noise conditions. The effects of incorporating statistical information of noise into the spatiotemporal inverse filter were examined by computer simulations and experimental studies in three sphere volume conductor model. The parametric projection filter that incorporated with noise covariance was applied to the inverse problem of EEG measurements. The noise covariance matrix was estimated by applying independent component analysis to the scalp potentials. The spatial filter was expanded to apply to the time-varying non-uniform noise conditions such as eye blink artifact. Moreover, multiple dipole distributions were introduced to extract and to visualize individual signal sources. The proposed imaging technique was applied to human experimental data of visual evoked potentials. We obtained reasonable results that coincide to physiological knowledge. © 2011 The Institute of Electrical Engineers of Japan.

    DOI: 10.1541/ieejeiss.131.1958

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  • Estimation of cortical dipole distributions for multiple signal sources based on ICA

    Junichi Hori, Yoshiki Watanabe

    2011 8th International Symposium on Noninvasive Functional Source Imaging of the Brain and Heart and the 2011 8th International Conference on Bioelectromagnetism, NFSI and ICBEM 2011   27 - 31   2011

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    Cortical dipole imaging is one of the spatial enhancement techniques from the scalp electroencephalogram. We investigated the cortical dipole imaging for multiple signal sources under time-varying non-uniform noise conditions. The effects of incorporating statistical information of noise into the spatiotemporal inverse filter were examined in three sphere volume conductor model. The parametric projection filter that incorporated with noise covariance was applied to the inverse problem of EEG measurements. The noise covariance matrix was estimated by applying independent component analysis to the scalp potentials. The spatial filter was expanded to apply to the time-varying non-uniform noise conditions such as eye blink artifact. Moreover, multiple dipole distributions were introduced to extract individual signal sources. The proposed imaging technique was applied to human experimental data of visual evoked potentials. © 2011 IEEE.

    DOI: 10.1109/NFSI.2011.5936813

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  • Three-dimensional Cortical Dipole Imaging of Brain Electrical Activity Considering Spherical and Median Planes Reviewed

    Junichi Hori, Takeshi Koide

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   6 ( 1 )   S42 - S49   2011

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    Equivalent cortical dipole layer imaging is proposed for high-resolution electroencephalogram (EEG) visualization. Equivalent dipole layer distribution parallel to the brain surface has been used in previous head models. In the present study, the additional dipole distribution on the median plane is introduced to identify the three-dimensional (3D) position and orientation of dipole sources. The parametric Wiener filter (PWF) using statistical signal and noise information was applied to solve an inverse problem of cortical dipole imaging. Simulations were performed in an inhomogeneous, concentric, three-sphere volume conductor head model under various signal conditions. Cortical dipole imaging provided localized brain electrical activity with better spatial resolution compared to the scalp potential map. These simulation results suggested that the depth and orientation of individual dipole sources could be observed by mapping on both spherical and median planes. We applied the proposed imaging technique to human experimental data of the visual evoked potential (VEP) and obtained reasonable results that coincide with physiological knowledge. (C) 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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  • Objective Evaluation of Somatic Sensation for Mechanical Stimuli by Means of Cortical Dipole Layer Imaging

    Junichi Hori, Takayoshi Kishi

    2011 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)   7021 - 7024   2011

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    In clinical situations, the objective evaluation of somatic sensations is expected without a patient's subjective opinions to reduce social problems such as those related to lawsuits for nerve injuries and malingering. In this study, the somatosensory evoked potential (SEP) using the mechanical stimulations of the tactile sensation was measured and analyzed in spatiotemporal domains. The spatial resolution of SEP maps was improved by application of cortical dipole layer imaging. The experimentally obtained results suggest that the spatiotemporal distributions of the SEPs reflect the differences for positions, strengths, and patterns of somatosensory stimulations.

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  • Signal and Noise Covariance Estimation Based on ICA for High-Resolution Cortical Dipole Imaging Reviewed

    Junichi Hori, Kentarou Sunaga, Satoru Watanabe

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E93D ( 9 )   2626 - 2634   2010.9

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    We investigated suitable spatial inverse filters for cortical dipole imaging from the scalp electroencephalogram (EEG). The effects of incorporating statistical information of signal and noise into inverse procedures were examined by computer simulations and experimental studies. The parametric projection filter (PPF) and parametric Wiener filter (PWF) were applied to an inhomogeneous three-sphere volume conductor head model. The noise covariance matrix was estimated by applying independent component analysis (ICA) to scalp potentials. The present simulation results suggest that the PPF and the PWF provided excellent performance when the noise covariance was estimated from the differential noise between EEG and the separated signal using ICA and the signal covariance was estimated from the separated signal. Moreover, the spatial resolution of the cortical dipole imaging was improved while the influence of noise was suppressed by including the differential noise at the instant of the imaging and by adjusting the duration of noise sample according to the signal to noise ratio. We applied the proposed imaging technique to human experimental data of visual evoked potential and obtained reasonable results that coincide to physiological knowledge.

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  • 3D cortical dipole imaging of brain electrical activity considering median plane

    Hori, J, Koide, T

    ISBET2009 (Brain Topography and Multimodal Imaging, Kyoto University Press)   2009.11

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  • High-Resolution Cortical Dipole Layer Imaging Based on Noise Covariance Matrix Invited

    Junichi Hori, Satoru Watanabe

    2009 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-20   73 - 76   2009

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    We have investigated the suitable spatial filters for inverse estimation of cortical dipole imaging from the scalp electroencephalogram. The effects of incorporating statistical information of noise into inverse procedures were examined by computer simulations and experimental studies. The parametric projection filter (PPF) was applied to an inhomogeneous three-sphere volume conductor head model. The noise covariance matrix was estimated by applying independent component analysis (ICA) to the scalp potentials. Moreover, the sampling method of the noise information was examined for calculating the noise covariance matrix. The simulation results suggest that the spatial resolution was improved while the effect of noise was suppressed by including the separated noise at the time instant of imaging and by adjusting the number of samples according to the signal to noise ratio.

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  • Development of pointing device using DC-Coupled electrooculogram Reviewed

    Hirotaka Uchitomi, Junichi Hori

    IEEJ Transactions on Electronics, Information and Systems   129 ( 10 )   1792 - 1800   2009

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    A purpose of this study is to support communication of developmentally disabled individuals with motor paralysis, such as Guillain-Barre Syndrome, brain-stem infarction, having difficulty in conveying their intention. In the present paper, a pointing device controlled by DC-coupled electrooculograms (EOGs) has been developed. The optic angle of the subject was estimated from the amplitude of vertical and horizontal EOGs for determining the two dimensional pointing position on the PC screen in real time. The eye blinking artifact was reduced using a median filter. The displacement of electrode position was compensated by considering the potential gradient. Moreover, the position error caused by drift phenomenon was adjusted by using head movement. The accuracy and operating speed of the proposed method were evaluated in human experiments. © 2009 The Institute of Electrical Engineers of Japan.

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  • Development of Pointing Device using DC-Coupled Electrooculogram

    Hirotaka Uchtiomi, Junichi Hori

    2009 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-20   6193 - 6196   2009

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    The purpose of this study is to support communication of individuals with motor paralysis having difficulty verbally communicating due to illnesses such as Guillain-Barre Syndrome or brain-stem infarction. We have developed and describe a pointing device controlled by DC-coupled electrooculograms (EOGs). The visual angle of the subject is estimated from the amplitude of vertical and horizontal EOGs for determining the two-dimensional pointing position on a PC screen in real time. The eye blinking artifact is reduced using a median filter. Electrode displacement is corrected by considering the potential gradient. Moreover, the position error caused by drift phenomenon is adjusted using head movement based on the vestibule-ocular reflex. The accuracy and operating speed of the proposed method were evaluated among a group of human subjects.

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  • Equivalent dipole sources localization using cortical dipole layer imaging and independent component analysis Reviewed

    Hori, J, Aoki, N

    Int. J. Bioelectromagnetism   10 ( 2 )   100 - 110   2008.6

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  • Development of high-speed random number generator using A/D converter with frequency modulation for cryptogram Reviewed

    Saitoh, Y, Hori, J

    Far East J. Electronics Communications   2 ( 2 )   153 - 170   2008.4

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  • Estimation of Signal and Noise Covariance using ICA for High-Resolution Cortical Dipole Imaging

    Junichi Hori

    2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Vols 1-8   3987 - 3990   2008

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    Suitable spatial filters were explored for inverse estimation of cortical dipole imaging from a scalp electroencephalogram. Computer simulations were used to examine the effects of incorporating statistical information of signal and noise into inverse procedures. Actually, the parametric projection filter (PPF) and parametric Wiener filter (PWF) were applied to an inhomogeneous three-sphere head model. The signal and noise covariance matrices were estimated by applying independent component analysis (ICA) to the scalp potentials. The simulation results described herein suggest that the PPF using differential noise between EEG and separated signal were equivalent to those obtained using the method with actual noise. Moreover, the PWF using separated signals has better performance than traditional inverse techniques.

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  • Dipole sources localization of MRPs using ICA and cortical dipole layer imaging

    Hori, J, Aoki, N

    6th Int. Conf. on Bioelectromagnetism   154 - 155   2007.10

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  • Cortical dipole layer imaging of brain electrical activity in horizontal and sagittal planes

    Hori, J, Koide, T

    6th Int. Conf. on Bioelectromagnetism   100 - 101   2007.10

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  • 注視点制御型拡大読書器の試み Reviewed

    前田義信, 宮川道夫, 宮澤洋一, 堀潤一, 岡本明, 安藤伸朗

    電子情報通信学会誌   J90-D ( 3 )   715 - 723   2007.3

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  • Cortical Imaging of Brain Electrical Activity using Parametric Inverse Filter Invited

    Junichi Hori, Toshinari Miwa, Takeshi Ohshima, Bin He

    WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING 2006, VOL 14, PTS 1-6   14   4208 - +   2007

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    A number of efforts have been made in the development of high-resolution EEG techniques, which attempt to map spatially distributed brain electrical activity with substantially improved spatial resolution. The objective of this study is to explore suitable spatial filters for inverse estimation of cortical potential imaging from the scalp electroencephalogram. The effects of incorporating statistically signal and noise information into inverse procedures were examined by computer simulations and experimental study. The parametric Weiner filter (PWF) with signal and noise covariance was applied to an inhomogeneous head model under various signal and noise conditions. The present simulation results suggest that, the PWF provides better cortical imaging results than the Tikhonov regularization under the condition of moderate and high correlation between signal and noise distributions. The proposed methods were applied to self-paced movement-related potentials (MRPs). The cortical potential maps estimated by means of PWF were well-localized in the premotor cortex, which is consistent with the hand motor representation.

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  • Dipole sources localization of MRPs using ICA and cortical dipole layer imaging

    Junichi Hori, Naotoshi Aoki

    2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING   59 - 62   2007

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    We have developed new estimation method for equivalent dipole sources inside of the brain. We have solved an inverse problem that estimated an equivalent dipole-layer distribution from the scalp electroencephalogram by a spatio-temporal inverse filters. In the present study, we estimated the position and moment of equivalent dipole sources from dipole layer distributions. Moreover, we separated each dipole layer distribution using independent component analysis to identify the number, position, and moment of several dipole sources. The performance of the proposed estimation method was evaluated by computer simulation and human experimental studies in an inhomogeneous three-concentric sphere head model. The present simulation results indicated that the equivalent dipole sources were accurately estimated by our methods. We also applied the proposed method to human experimental data of movement-related potentials.

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  • Cortical dipole imaging of movement-related potentials by means of parametric inverse filters incorporating with signal and noise covariance Reviewed

    J. Hori, T. Miwa, T. Ohshima, B. He

    METHODS OF INFORMATION IN MEDICINE   46 ( 2 )   242 - 246   2007

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    Objective: The objective of this study is to explore suitable spatial filters for inverse estimation of cortical equivalent dipole layer imaging from the scalp electroencephalogram. We utilize cortical dipole source imaging to locate the possible generators of scalp-measured movement-related potentials (MRPs) in human.
    Methods: The effects of incorporating signal and noise covariance into inverse procedures were examined by computer simulations and experimental study. The parametric projection filter (PPF) and parametric Weiner filter (PWF) were applied to an inhomogeneous three-sphere head model under various noise conditions.
    Results: The present simulation results suggest that the PWF incorporating signal information provides better cortical dipole layer imaging results than the PPF and Tikhonov regularization under the condition of moderate and high correlation between signal and noise distributions. On the other hand, the PPF has better performance than other inverse filters under the condition of low correlation between signal and noise distributions. The proposed methods were applied to self-paced MRPs in order to identify the anatomic substrate locations of neural generators. The dipole layer distributions estimated by means of PPF are well-localized as compared with blurred scalp potential maps and dipole layer distribution estimated by Tikhonov regularization. The proposed methods demonstrated that the contralateral premotor cortex was preponderantly activated in relation to movement performance.
    Conclusions: In cortical dipole source imaging, the PWF has better performance especially when the correlation between the signal and noise is high. The proposed inverse method was applicable to human experiments of MRPs if the signal and noise covariances were obtained.

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  • 3D cortical dipole Imaging of brain electrical activity using horizontal and sagittal dipole layers

    Junichi Hori, Bin He

    2007 3RD INTERNATIONAL IEEE/EMBS CONFERENCE ON NEURAL ENGINEERING, VOLS 1 AND 2   221 - +   2007

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    A horizontal and vertical dipole layer model was developed for three dimensional dipole layer imaging of brain electrical activity. Horizontal dipole layer being parallel to the brain surface has been used in previous head models. In the present study, the dipole layer distribution in the sagittal plane was also estimated from the scalp electroencephalogram. The parametric projection filter was applied to an inverse problem in a homogeneous plane head model under various signal conditions. The present simulation results suggest that the depth information of dipole sources could be observed by our method.

    DOI: 10.1109/CNE.2007.369651

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  • Development of a communication support device controlled by eye movements and voluntary eye blink Reviewed

    J Hori, K Sakano, Y Saitoh

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E89D ( 6 )   1790 - 1797   2006.6

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    A communication support interface controlled by eye movements and voluntary eye blink has been developed for disabled individuals with motor paralysis who cannot speak. Horizontal and vertical electro-oculograms were measured using two surface electrodes attached above and beside the dominant eye and referring to an earlobe electrode and amplified with AC-coupling in order to reduce the unnecessary drift. Four directional cursor movements -up, down, right, and left- and one selected operation were realized by logically combining the two detected channel signals based on threshold settings specific to the individual. Letter input experiments were conducted on a virtual screen keyboard. The method's usability was enhanced by minimizing the number of electrodes and applying training to both the subject and. the device. As a result, an accuracy of 90.1 +/- 3.6% and a processing speed of 7.7 +/- 1.9 letters/min. were obtained using our method.

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  • Fundamental characteristics of an RF hyperthermic system using a rectangular cavity applicator for deep-seated tumors Reviewed

    Tange, Y, Saitoh, Y, Kanai, Y, Hori, J

    Jpn. J. Hyperthermia Oncol.   22 ( 1 )   1 - 11   2006.3

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  • Cortical potential imaging of movement-related potentials using parametric wiener filter in realistic-shaped head model

    Junichi Hori, Bin He

    2006 28TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-15   1132 - +   2006

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    Suitable spatial filters were explored for inverse estimation of cortical potential imaging from the scalp electroencephalogram. The effects of incorporating signal and noise covariance into inverse procedures were examined by computer simulations and experimental study. The parametric Wiener filter (PWF) was applied to an inhomogeneous three-sphere head model under various signal and noise conditions. We also examined estimation methods for the signal covariance in PWF. The present simulation results suggest that the PWF with modified matrix transformation method has better performance. The proposed methods were applied to self-paced movement-related potentials in order to identify the anatomic substrate locations of neural generators in realistic-shaped head model. The proposed methods demonstrated that the contralateral premotor cortex was preponderantly activated in relation to movement performance.

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  • Development of EOG-based communication system controlled by eight-directional eye movements

    Kenji Yamagishi, Junichi Hori, Michio Miyakawa

    2006 28TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-15   1212 - +   2006

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    A communication support interface controlled by eye movements and voluntary eye blink has been developed for disabled individuals with motor paralysis who cannot speak. Horizontal and vertical electro-oculograms were measured using two electrodes attached above and beside the dominant eye and referring to an earlobe electrode and amplified with AC-coupling in order to reduce the unnecessary drift. Eight directional cursor movements and one selected operation were realized by logically combining the two detected channel signals based on threshold setting specific to the individuals. As experimental results using a projected screen keyboard, processing speed was improved to 12.1 letters/min. while the accuracy was 90.4%.

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  • A smart video magnifier controlled by the visibility signal of a low vision user

    Michio Miyakawa, Yoshinobu Maeda, Youichi Miyazawa, Junichi Hori

    2006 28TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-15   1157 - +   2006

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    A smart video magnifier for the people with visual disabilities is now being developed to assist their stress-free reading. In a video magnifier, the users watch the monitor screen that is displaying the book page to be read. Eye movement is needed for reading a book. The difficulty of character recognition that is dependent on the environmental conditions is reflected to the eye movement. Accordingly, information on the visibility of the user is extracted as physiological signals accompanied by the gazing motion. These signals are basically used to control the video magnifier. The advantages and usefulness of the adaptive-type video magnifier are discussed in this paper.

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  • Development of EOG-based communication system controlled by eight-directional eye movements

    Kenji Yamagishi, Junichi Hori, Michio Miyakawa

    2006 28TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-15   1212 - +   2006

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    A communication support interface controlled by eye movements and voluntary eye blink has been developed for disabled individuals with motor paralysis who cannot speak. Horizontal and vertical electro-oculograms were measured using two electrodes attached above and beside the dominant eye and referring to an earlobe electrode and amplified with AC-coupling in order to reduce the unnecessary drift. Eight directional cursor movements and one selected operation were realized by logically combining the two detected channel signals based on threshold setting specific to the individuals. As experimental results using a projected screen keyboard, processing speed was improved to 12.1 letters/min. while the accuracy was 90.4%.

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  • Eye movement communication control system based on EOG and voluntary eye blink

    Junichi Hori, Koji Sakano, Michio Miyakawa, Yoshiaki Saitoh

    COMPUTERS HELPING PEOPLE WITH SPECIAL NEEDS, PROCEEDINGS   4061   950 - 953   2006

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    A communication support interface controlled by eye movements and voluntary eye blink has been developed for disabled individuals with motor paralysis who cannot speak. Horizontal and vertical electro-oculograms were measured using two surface electrodes attached above and beside the dominant eye and referring to an earlobe electrode and amplified with AC-coupling in order to reduce the unnecessary drift. Four directional cursor movements -up, down, right, and left- and one selected operation were realized by logically combining the two detected channel signals based on threshold settings specific to the individual. Letter input experiments were conducted on a virtual screen keyboard. As a result, operatablility, accuracy, and processing speed were improved using our method.

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  • Generation of physical random number using the lowest bit of an A-D converter

    T Moro, Y Saitoh, J Hori, T Kiryu

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE   89 ( 6 )   13 - 21   2006

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    One of the methods of generating physical random numbers is the use of electrical signals. Previously, when random numbers have been generated from electrical signals, a threshold value has been imposed on the signal level and "0" and "1" have been assigned depending on whether this threshold value was exceeded. In the present paper, the lowest bit of an A-D converter is used so as to demonstrate that high-speed generation of random numbers, which is not achievable by the conventional method, is now possible. Further, it is demonstrated that random numbers can be generated by fluctuations of an oscillator instead by a special noise generator. (c) 2006 Wiley Periodicals, Inc.

    DOI: 10.1002/ecjc.20215

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  • Eye movement communication control system based on EOG and voluntary eye blink Reviewed

    Junichi Hori, Koji Sakano, Michio Miyakawa, Yoshiaki Saitoh

    COMPUTERS HELPING PEOPLE WITH SPECIAL NEEDS, PROCEEDINGS   4061   950 - 953   2006

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    A communication support interface controlled by eye movements and voluntary eye blink has been developed for disabled individuals with motor paralysis who cannot speak. Horizontal and vertical electro-oculograms were measured using two surface electrodes attached above and beside the dominant eye and referring to an earlobe electrode and amplified with AC-coupling in order to reduce the unnecessary drift. Four directional cursor movements -up, down, right, and left- and one selected operation were realized by logically combining the two detected channel signals based on threshold settings specific to the individual. Letter input experiments were conducted on a virtual screen keyboard. As a result, operatablility, accuracy, and processing speed were improved using our method.

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  • Estimation of cortical dipole sources by equivalent dipole layer imaging and independent component analysis

    Naotoshi Aoki, Junichi Hori, Bin He

    2006 28TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-15   1185 - +   2006

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    We explored suitable estimation method for equivalent dipole sources in the brain. In a previous study, we solved an inverse problem that estimated an equivalent dipole-layer distribution from the scalp electroencephalogram by a spatio-temporal inverse filters constructed with parametric projection filter. In the present study, we estimated equivalent dipole sources from dipole layer distributions. Moreover, to identify the number, position, and moment of equivalent dipole sources, we separated each dipole layer distribution using independent component analysis (ICA). The performance of the proposed estimation method was evaluated by computer simulation and human experimental studies in an inhomogeneous three-concentric sphere head model. The present simulation results indicated that the equivalent dipole sources was accurately estimated by ICA and dipole imaging. We also applied the proposed method to human visual evoked potential.

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  • Estimation of cortical dipole sources by equivalent dipole layer imaging and independent component analysis

    Naotoshi Aoki, Junichi Hori, Bin He

    2006 28TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-15   1185 - +   2006

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    We explored suitable estimation method for equivalent dipole sources in the brain. In a previous study, we solved an inverse problem that estimated an equivalent dipole-layer distribution from the scalp electroencephalogram by a spatio-temporal inverse filters constructed with parametric projection filter. In the present study, we estimated equivalent dipole sources from dipole layer distributions. Moreover, to identify the number, position, and moment of equivalent dipole sources, we separated each dipole layer distribution using independent component analysis (ICA). The performance of the proposed estimation method was evaluated by computer simulation and human experimental studies in an inhomogeneous three-concentric sphere head model. The present simulation results indicated that the equivalent dipole sources was accurately estimated by ICA and dipole imaging. We also applied the proposed method to human visual evoked potential.

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  • Cortical dipole imaging of movement-related potentials by means of parametric inverse filter incorporating with signal and noise covariance

    Hori, J, Miwa, T, Ohshima, T, He, B

    Proc. 5th Int. Workshop Biosignal Interpretation   105 - 108   2005.9

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  • Cortical dipole imaging of movement-related potentials in humans by means of parametric inverse filter Reviewed

    Hori, J, Miwa, T, He, B

    International Journal of Bioelectromagnetism   7 ( 2 )   181 - 184   2005.6

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  • A-D変換器の最下位ビットを用いた暗号用乱数生成法 Reviewed

    茂呂友子, 斉藤義明, 堀潤一, 木竜徹

    電子情報通信学会誌   J88-A ( 6 )   714 - 721   2005.6

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  • Cortical dipole imaging of movement-related potentials in humans by means of parametric inverse filter

    Hori, J, Miwa, T, He, B

    BEM & NFSI Conf. Proc.,   7 ( 2 )   181 - 184   2005.5

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  • Generation of physical random number using frequency-modulated LC oscillation circuit with shot noise

    Y Saitoh, J Hori, T Kiryu

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE   88 ( 5 )   12 - 19   2005

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    The authors previously published a physical method for the generation of random numbers by a variable capacitance parametron, which can generate uniform random numbers without periodicity. It is considered possible to generate random numbers with an ordinary oscillator if the oscillation frequency is made unstable. As a method of introducing instability, frequency modulation of an LC oscillator with shot noise is considered. The present paper describes experiments with an LC oscillator to which shot noise is applied. An evaluation of statistical randomness (FIPS 140-2) is carried out for the generated number sequence as cryptographic random numbers. It is shown that generation of random numbers is possible. (C) 2005 Wiley Periodicals, Inc.

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  • Adaptive Video Magnifier Controlled by the Effective Eyesight of Low Vision Patients

    Miyakawa Michio, Maeda Yoshinobu, Tamaki Tohru, Hori Junichi

    Journal of Life Support Technology   17   38 - 38   2005

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    DOI: 10.5136/lifesupport.17.Supplement_38

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  • Spatiotemporal dipole imaging of brain electrical activity Invited

    Hori, J, He, B

    International Workshop for Bioelectromagnetism   18   2004.10

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  • ショット雑音で周波数変調したLC発振回路による物理乱数の生成 Reviewed

    斉藤義明, 堀潤一, 木竜徹

    電子情報通信学会誌   J87-A ( 7 )   930 - 937   2004.7

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  • Spatiotemporal Dipole Imaging of Brain Electrical Activity Reviewed

    Hori, J, He, B

    International Journal of Bioelectromagnetism   6 ( 2 )   29 - 34   2004.6

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  • Spatio-temporal cortical source imaging of brain electrical activity by means of time-varying parametric projection filter Reviewed

    JC Hori, M Aiba, B He

    IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING   51 ( 5 )   768 - 777   2004.5

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    In the present study, we explore suitable spatio-temporal filters for inverse estimation of an equivalent dipole-layer distribution from the scalp electroencephalogram (EEG) for imaging of brain electric sources. We propose a time-varying parametric projection filter (tPPF) for the spatio-temporal EEG analysis. The performance of this tPPF algorithm was evaluated by computer simulation studies. An inhomogeneous three-concentric-spheres model was used in the present simulation study to represent the head volume conductor. An equivalent dipole layer was used to represent equivalently brain electric sources and estimated from the scalp potentials. The tPPF filter was tested to remove time-varying noise such as instantaneous artifacts caused by eyes-blink. The present simulation results indicate that the proposed time-variant tPPF method provides enhanced performance in rejecting time-varying noise, as compared with the time-invariant parametric projection filter.

    DOI: 10.1109/TBME.2004.824142

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  • Artefact elimination in spatiotemporal cortical dipole layer imaging with parametric projection filter

    J Hori, B He

    FRONTIERS IN HUMAN BRAIN TOPOGRAPHY   1270   130 - 133   2004

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    We explore suitable spatiotemporal filters for inverse estimation of an equivalent cortical dipole layer (DL) distribution from the scalp electroencephalogram (EEG) for imaging of brain electric sources. We have previously developed the parametric projection filter (PPF)-based cortical dipole layer imaging technique, which allows estimating cortical dipole layer inverse solutions in the presence of noise covariance. We have expanded the PPF to the time-varying filter in order to handle the spatiotemporally varying nature of brain electrical activity. The present simulation results indicate that the estimation error is reduced substantially by taking the spatiotemporal properties of the noise into consideration, such as eye-blink artefacts, and the proposed time-variant PPF method provides enhanced performance in rejecting time-varying noise. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ics.2004.05.149

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  • Artefact elimination in spatiotemporal cortical dipole layer imaging with parametric projection filter

    J Hori, B He

    FRONTIERS IN HUMAN BRAIN TOPOGRAPHY   1270   130 - 133   2004

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    We explore suitable spatiotemporal filters for inverse estimation of an equivalent cortical dipole layer (DL) distribution from the scalp electroencephalogram (EEG) for imaging of brain electric sources. We have previously developed the parametric projection filter (PPF)-based cortical dipole layer imaging technique, which allows estimating cortical dipole layer inverse solutions in the presence of noise covariance. We have expanded the PPF to the time-varying filter in order to handle the spatiotemporally varying nature of brain electrical activity. The present simulation results indicate that the estimation error is reduced substantially by taking the spatiotemporal properties of the noise into consideration, such as eye-blink artefacts, and the proposed time-variant PPF method provides enhanced performance in rejecting time-varying noise. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ics.2004.05.149

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  • Cortical potential imaging of brain electrical activity by means of parametric projection filter Reviewed

    J Hori, J Lian, B He

    METHODS OF INFORMATION IN MEDICINE   43 ( 1 )   66 - 69   2004

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    Objectives: The objective of this study was to explore suitable spatial filters for inverse estimation of cortical potentials from the scalp electroencephalogram. The effect of incorporating noise covariance into inverse procedures was examined by computer simulations and tested in human experiment.
    Methods: The parametric projection filter, which allows inverse estimation with the presence of information on the noise, was applied to an inhomogeneous three-concentric-sphere model under various noise conditions in order to estimate the cortical potentials from the scalp potentials. The method for determining the optimum regularization parameter, which can be applied for parametric inverse techniques, is also discussed.
    Results. Human visual evoked potential experiment was carried out to examine the performance of the proposed restoration method. The parametric projection filter gave more localized inverse solution of cortical potential distribution than the truncated SVD and Tikhonov regularization.
    Conclusion: The present simulation results suggest that incorporation of information on the noise covariance allows better estimation of cortical potentials, than inverse solutions without knowledge about the noise covariance, when the correlation between the signal and noise is low.

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  • Development of communication supporting device controlled by eye movements and voluntary eye blink

    J Hori, K Sakano, Y Saitoh

    PROCEEDINGS OF THE 26TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-7   26   4302 - 4305   2004

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    A communication interface controlled by eye movements and voluntary eye blink has been developed for disabled individuals who have motor paralysis and therefore cannot speak. Horizontal and vertical electro-oculograms were measured using two surface electrodes referring to an earlobe electrode. Four directional cursor movements and one selection were realized by logically combining the detected two channel signals. Virtual input experiments were conducted on a virtual screen keyboard. Its usability and accuracy were improved using our proposed method.

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  • Spatio-temporal brain electrical imaging based on time-varying spatial inverse filter

    Hori, J, Aiba, M, Saitoh, Y, He, B

    Proc. PIERS Progress in Electromagnetic Research Symposium   518   2003.10

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  • EEG cortical potential Imaging of brain electrical activity by means of parametric projection filters Reviewed

    J Hori, B He

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E86D ( 9 )   1909 - 1920   2003.9

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    The objective of this study was to explore suitable spatial filters for inverse estimation of cortical potentials from the scalp electroencephalogram. The effect of incorporating noise covariance into inverse procedures was examined by computer simulations. The parametric projection filter, which allows inverse estimation with the presence of information on the noise covariance, was applied to an inhomogeneous three-concentric-sphere model under various noise conditions in order to estimate the cortical potentials from the scalp potentials. The present simulation results suggest that incorporation of information on the noise covariance allows better estimation of cortical potentials, than inverse solutions without knowledge about the noise covariance. when the correlation between the signal and noise is low. The method for determining the optimum regularization parameter, which can be applied for parametric inverse techniques, is also discussed.

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  • Spatio-temporal cortical equivalent dipole layer imaging by means of time-varying parametric projection filter

    Hori, J, Aiba, M, He, B

    World Congress on Medical Physics and Biomedical Engineering   2003.8

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  • Generation of physical random numbers with a variable-capacitor parametron

    Y Saitoh, J Hori, H Nishimura, T Kiryu

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE   86 ( 2 )   24 - 32   2003

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    In the present study, a random number generator which physically produces nonperiodic uniform random number was developed using the parametron principle. The parametron is an oscillation circuit at one-half of the excited frequency. The phase of the parametron cannot be predicted because it depends on the noise in the parametron circuit. The random number was generated by detecting the unpredictable phase. The randomness of the data generated by the present method was confirmed by the spatial distribution and by statistical random tests. (C) 2002 Wiley Periodicals, Inc.

    DOI: 10.1002/ecjc.10040

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  • Brain Electrical Imaging by Means of Parametric Projection Filters Invited

    Hori, J, He, B

    Proc. PIERS Progress in Electromagnetic Research Symposium in 2002   595   2002.7

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  • Cortical potential imaging of brain electrical activity by means of parametric projection filter

    Hori, J, Lian, J, He, B

    Proc. 4th Int. Workshop Biosignal Interpretation   311 - 314   2002.6

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  • 可変容量パラメトロンによる物理的乱数発生法 Reviewed

    斉藤義明, 堀潤一, 西村浩志, 木竜徹

    電子情報通信学会誌   J85-A ( 2 )   181 - 188   2002.2

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  • Comparison between parametric Weiner filter and parametric projection filter in cortical equivalent dipole layer imaging

    J Hori, J Lian, B He

    SECOND JOINT EMBS-BMES CONFERENCE 2002, VOLS 1-3, CONFERENCE PROCEEDINGS   929 - 930   2002

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    The objective of this study is to explore suitable spatial filters for inverse estimation of cortical equivalent dipole layer imaging from the scalp electroencephalogram. The effects of incorporating signal and noise covariance into inverse procedures were examined by computer simulations. The parametric projection filter (PPF) and parametric Weiner filter (PWF) were applied to an ideal 3D head model under various noise conditions. The present simulation results suggest that the PPF has better performance than the PWF, when the correlation between the signal And noise is low, and the PWF performs better than the PPF when the correlation is high.

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  • Fundamental study of a combined hyperthermia system with RF capacitive heating and interstitial heating Reviewed

    Saitoh, Y, Hori, J

    Jpn. J. Hyperthermia Oncol.   17 ( 4 )   231 - 244   2001.12

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    DOI: 10.3191/thermalmedicine.17.231

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  • High-resolution cortical imaging by means of parametric projection filters Invited

    Hori, J, He, B

    Proc. Asia-Pacific Radio Science Conference   265   2001.8

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  • Equivalent dipole source imaging of brain electric activity by means of parametric projection filter Reviewed

    J Hori, B He

    ANNALS OF BIOMEDICAL ENGINEERING   29 ( 5 )   436 - 445   2001.5

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    In the present study, spatial filters for inverse estimation of an equivalent dipole layer from the scalp-recorded potentials have been explored for their suitability in achieving high-resolution electroencephalogram (EEG) imaging. The performance of the parametric projection filter (PPF), which we propose to use for high-resolution EEG imaging, has been evaluated by computer simulations in the presence of a priori information on noise. An inhomogeneous three-concentric-sphere head model was used in the present simulation study to represent the head volume conductor. An equivalent dipole layer was used to model brain electric sources and estimated From the scalp potentials. Various noise conditions were simulated and the parametric projection filter was compared with standard regularization procedures such as the truncated singular value decomposition (TSVD) and the Tikhonov regularization (TKNV). The present simulation results suggest that the proposed method performs better than that of commonly used inverse regularization techniques, such as the general inverse using the TSVD and the TKNV, when the correlation between the original source distribution and the noise distribution is low, and performs similarly when the correlation is high. A method for determining the optimum regularization parameter, which can be applied to parametric inverse techniques, has also been developed. (C) 2001 Biomedical Engineering Society.

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  • Improvement and restoration of biomedical images blurred by body movement

    J Hori, Y Saitoh, T Kiryu, K Okamoto, K Sakai

    PROCEEDINGS OF THE 23RD ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4   23   2484 - 2487   2001

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    The restoration of biomedical images that have been blurred due to body movement are discussed. The observation system for these images is described using a mathematical operator and coordinate transformations. And a band-suppressed restoration filter composed of a series of such operators is proposed for improving the quality of images. In addition, redundancy is introduced into these restoration filters in order to suppress additive noise. The proposed method is applied to blurred X-ray images of a bone model of the elbow joint. The optimum position and number of markers, which are attached to the subject as a reference signal, are also discussed.

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  • Band-suppressed restoration of X-ray images blurred by body movement Reviewed

    J Hori, Y Saitoh, T Kiryu, K Okamoto, K Sakai

    METHODS OF INFORMATION IN MEDICINE   39 ( 2 )   130 - 133   2000.6

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    The restoration of X-ray images that have been blurred due to body movement are discussed. The observation system for these images is described using a mathematical model, and several restoration filters composed of a series of such models are proposed. These filters restore band-suppressed approximations of the original images. In addition, redundancy is introduced into these restoration filters in order to suppress additive noise. These filters are expanded to be applicable not only to parallel translations, but also to rotations by coordinate transformation. The proposed methods are applied to blurred X-ray images of a bone model of the elbow joint. The parameters of the restoration filter are estimated using a marker attached to the subject as a reference signal.

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  • 磁気センサを用いた無意識呼吸心拍動検出装置の開発 Reviewed

    斉藤義明, 堀潤一, 木竜徹

    日本ME学会   38 ( 2 )   102 - 110   2000.2

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    DOI: 10.11239/jsmbe1963.38.102

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  • A simulation study on spatial filters for cortical source imaging from EEG

    J Hori, B He

    PROCEEDINGS OF THE 22ND ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4   22   2748 - 2750   2000

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    The objective of this study was to explore suitable spatial filters for inverse estimation of cortical equivalent dipole layer from the scalp EEG The performance of the Weiner filter and the projection filter as a restoration filter was examined by computer simulations. The parametric Weiner filter (PWF) and the parametric projection filter (PPF) were applied to an idealized 3D head model under the various noise conditions in order to estimate the dipole layer distribution from scalp potentials. The PPF and PWF algorithms were compared with commonly used inverse regularization techniques, such as the general inverse using the truncated singular value decomposition (TSVD) and the Tikhonov regularization (TKNV), The present simulation results suggest that the PWF and PPF perform better than that of the TSVD and the TKNV in the condition of edge-concentrated non- uniform noise when the correlation between the signal and noise is low.

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  • Band-suppressed restoration of X-ray images blurred by body movement

    Hori, J, Saitoh, Y, Kiryu, T, Okamoto, K, Sakai, K

    Proc. 3rd Int. Workshop Biosignal Interpretation   338 - 341   1999.11

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  • Real-time restoration of nonstationary biomedical signals under additive noises Reviewed

    J Hori, Y Saitoh, T Kiryu

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E82D ( 10 )   1409 - 1416   1999.10

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    In the present paper we shall examine the real-time restoration of biomedical signals under additive noises. Biomedical signals measured by instruments such as catheter manometers, ambulatory electrocardiographs and thermo-dilution sensors are susceptible to distortion and noise. Therefore, such signals must be restored to their original states. In the present study, nonstationary biomedical signals are observed and described using a mathematical model, and several restoration filters that are composed of a series of applications of this model are proposed. These filters restored band-limited approximations of the original signals in real-time. In addition, redundancy is introduced into these restoration filters in order to suppress additive noise. Finally, an optimum filter that accounts for restoration error and additive noise is proposed.

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  • Expansion of band-suppressed restoration for biomedical signals

    Hori, J, Saitoh, Y, Kiryu, T

    Proc. of the First Joint Meeting of BMES and EMBS   883   1999.10

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  • Band-suppressed restoration of blurred X-ray images

    J Hori, Y Saitoh, T Kiryu, K Okamoto, K Sakai

    PROCEEDINGS OF THE 20TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOL 20, PTS 1-6   20   715 - 718   1998

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    In this paper we examined the restoration of X-ray images blurred by body motion. We described the observation of these images with a mathematical model and proposed several restoration filters composed of series of such models. These filters restored band-suppressed approximations of the original images in real-time. Furthermore, we introduced redundancy into these restoration filters in order to suppress the additive noise. We applied these methods to blurred X-ray images of an elbow bone model. The parameters of the restoration Filter were estimated by using a marker attached to the subject as a reference signal.

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  • 大気のじょう乱による劣化画像の帯域抑制復元 Reviewed

    小川康栄, 斉藤義明, 堀潤一, 木竜徹

    電子情報通信学会誌   J80-D-II ( 12 )   3155 - 3163   1997.12

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  • Real-time restoration of biomedical signals under additive noise

    Hori, J, Saitoh, Y, Kiryu, T

    Int. Conf. of IEEE EMBS   1326 - 1327   1997.10

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  • 食塩水を併用した針電極組織内RF加温法の加温領域拡大について Reviewed

    齊藤義明, 市田隆文, 堀潤一, 松田康伸, 渡辺雅史

    日本ハイパーサーミア学会誌   13 ( 2 )   68 - 74   1997.6

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    DOI: 10.3191/thermalmedicine.13.68

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  • リエントラント型空洞共振器アプリケータの加温特性-小規模ファントムを用いた実験的考察 Reviewed

    鹿妻洋之, 齊藤義明, 宮川道夫, 堀潤一

    日本ハイパーサーミア学会誌   12 ( 4 )   410 - 409   1996.12

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    DOI: 10.3191/thermalmedicine.12.401

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  • Internal Hyperthermia with Chain Electrode Under Laparoscopy Reviewed

    SAITOH Yoshiaki, ICHIDA Takafumi, HORI Jun-ichi

    Thermal Medicine   12 ( 4 )   393 - 400   1996.12

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    Basic heating characteristics of a flexible and variable shape electrode were measured for a new internal hyperthermic therapy under laparoscopy. A metal chain was used as an internal electrode in 13. 56 MHz RF heating. Heating characteristics were measured with various shapes of chain electrodes, <I>i. e</I>. zigzag, spiral, radiation and layers. From the results of experiments using muscle-equivalent phantoms, we conclude that concentrated heating characteristics were produced between the internal electrode and the reference electrode when spreading the chain electrode arranged in layers, parallel to the reference electrode.

    DOI: 10.3191/thermalmedicine.12.393

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  • Real-time restoration of nonstationary biomedical signals

    Hori, J, Saitoh, Y, Kiryu, T

    Proc. 2nd IMIA-IFMBE Int. Workshop Biosignal Interpretation   119 - 120   1996.9

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  • Implantable temperature measurement system using the parametron phenomenon Reviewed

    Y Saitoh, A Kanke, Shinozaki, I, T Kiryu, J Hori

    IEICE TRANSACTIONS ON COMMUNICATIONS   E79B ( 8 )   1129 - 1134   1996.8

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    Adapting the principle of parametron oscillation, a small implantable temperature sensor requiring no internal power supply is described. Since this sensor's oscillation frequency is half that of the excitation frequency, the oscillated signal can be measured from the reception side, free of any signal, interference, simply by positioning the sensor and the excitation antenna so that; 1) they are separated up to 95 cm in the air; 2) a 41 cm gap, the phantom equivalent of the thickness of the human abdomen maintain between them. In the temperature-dependent quartz resonator sensor, oscillation occurs only when frequency and temperature correspond. The excitation power is then adjusted so that the frequency bandwidth narrows. As a result, the margin of error in measuring the temperature is minimized; (+/- 0.07 degrees C).

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  • 非定常信号の実時間復元 Reviewed

    堀潤一, 小川英光

    電子情報通信学会誌   J79-D-II ( 3 )   430 - 438   1996.5

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  • Heating Characteristics with Reentrant Resonant-Cavity Applicator. An Experimental Study with Small Phantom Model.:An Experimental Study with Small Phantom Model

    Kazuma Hiroyuki, Saitoh Yoshiaki, Miyakawa Michio, Hori Jun'ichi

    Thermal Medicine   12 ( 4 )   401 - 409   1996

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    A "reentrant resonant-cavity applicator" is a hyperthermic system having a resonant cavity, inside of which are two reentrants. In simulated heating test, the applicator produced a cylinder-shaped area of high temperature in the center of a heated object. This paper describes the heating characteristics of the applicator, in order to appraise its ability to produce concentrated heating for cylindrical-shaped phantoms of 24 cm diameter and 12 cm height. In experiments using these phantoms, concentrated heating characteristics were produced, which are superior to RF capacitive heating. In order to perform concentrated heating, 1) the height of the phantoms must be maintained at less than about 40% of the distance between the two reentrants, 2) the diameter of the plates concentrating the electric field must be about 1.5 times larger than the height of the phantom, 3) the impedance between the applicator and a power supply must be matched.

    DOI: 10.3191/thermalmedicine.12.401

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  • IMPROVEMENT OF THE TIME-DOMAIN RESPONSE OF A THERMODILUTION SENSOR BY THE NATURAL OBSERVATION SYSTEM Reviewed

    J HORI, Y SAITOH, T KIRYU

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E77A ( 5 )   784 - 791   1994.5

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    When measuring the ejection fraction for the evaluation of the ventricular pumping function by means of the thermodilution technique, the slow response a conventional thermistor has caused it to be considered unsuitable, and fast thermistors have been proposed as an alternative. However, in this paper we propose improving the time-domain response of a conventional thermistor using a signal processing technique composed of a series of first-order high-pass filters which is known as the natural observation system. We considered the rise time of the thermistor in response to a step temperature change to effect correction for the measurement of the ejection fraction. The coefficients of the natural observation system were calculated by minimizing the square error between the step-response signal of the thermistor and the band-limited reference signal. In an experiment using a model ventricle, the thermodilution curve obtained from a conventional thermistor was improved using the proposed technique, thus enabling successful measurement of the ejection fraction of the ventricles.

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  • Power-frequency-time analysis of closing sound of SJM prosthetic heart valve in vitro. Reviewed

    FUJITA Y., TSUCHIDA S., HAYASHI J., EGUCHI S., HONI J., SAITO Y.

    Journal of the Japanese Society for Artificial Organs and Tissues   23 ( 1 )   151 - 154   1994.2

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    We studied the closing sound of SJM prosthetic heart valve(SJM) by the power-frequency-time analysis, using the fast Fourier transform; the method of Wigner-Ville. The peak of distribution of power-frequencytime surface was around 1.3 to 1.5KHz, and its maximal value was up to 5.0 KHz. As the frequency of the sound spectrum became higher, the power became weaker proportionally . By the pseudo-thrombus attachment to the SJM ring, decrease in the power was noted especially in the range of 1.5 to 3.0 KHz. When the size of the pseudo-thrombus was gotten to be bigger, decrease in the power in the range of 1.5 to 3.0 KHz was also noted. Furthermore, the appearance-time of the sound spectrum got shorter. When it was the maximal size of pseudo-thrombus, finally, the distribution of the continuous frequency peaked at 1.0 KHz was only noted. In this study, by analysis of the power-frequency-time analysis of the closing sound of SJM, the decrease in the power as well as shortening o f the appearance-time of the spectrum were noted in the case of the pseudo-thrombus attached on SJM. It was soncluded that the powerfrequency-time analysis of closing sound of SJM was useful for the early and accurate diagnosis for its malfunction.

    DOI: 10.11392/jsao1972.23.151

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  • REAL-TIME SIGNAL RESTORATION BY NATURAL-OBSERVATION SYSTEM

    J HORI, Y SAITOH, T KIRYU

    PROCEEDINGS OF THE 16TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY - ENGINEERING ADVANCES: NEW OPPORTUNITIES FOR BIOMEDICAL ENGINEERS, PTS 1&2   1326 - 1327   1994

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  • ELECTROCARDIOGRAM DATA-COMPRESSION BY THE OSLO ALGORITHM AND DP MATCHING Reviewed

    Y SAITOH, Y HASEGAWA, T KIRYU, J HORI

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E76D ( 12 )   1411 - 1418   1993.12

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    We use the B spline function and apply the Oslo algorithm to minimize the number of control points in electrocardiogram (ECG) waveform compression under the limitation of evaluation indexes. This method is based on dynamic programming matching to transfer the control points of a reference ECG waveform to the succeeding ECG waveforms. This reduces the execution time for beat-to-beat processing. We also reduced the processing time at several compression stages. When the difference percent normalized root mean square difference is around 10, our method gives the highest compression ratio at a sampling frequency of 250 Hz.

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  • AUTOMATIC CORRECTION OF LEFT-VENTRICULAR PRESSURE WAVE-FORM USING THE NATURAL OBSERVATION METHOD Reviewed

    J HORI, Y SAITOH, T KIRYU, T IIJIMA

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E75D ( 6 )   909 - 915   1992.11

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    The pressure waveforms indicated on a catheter manometer system are subject to serious distortion due to the resonance of the catheter itself, or the compliance of a particular transducer. Although several methods have been proposed for improving those characteristics, they have never been put into practice. We have focused on the transfer function of the catheter manometer, and made a pilot system, using the natural observation method. This method has been suggested as a means of studying the structure of the instantaneous waveform. In this manner, we were able to increase the bandwidth in the frequency domain and reduce the ringing in the time domain. Correction was performed automatically, using a step wave. Reproduction of the waveform with a flushing device, was a task of equal simplicity, that allowed us to estimate the system parameters so that the response waveform became step-like. In the experiment, our system provided distortion-free left-ventricular pressure waveform measurements and exact evaluation of the cardiac pumping system. The values obtained came much closer to the original figures arrived at by the catheter-tip manometer system.

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  • Frequency spectrum analysis of closing sound of SJM prosthtic heart valve in vitro. Reviewed

    FUJITA Y., HAYASHI J., MORI H., YAMAMOTO K., EGUCHI S., HORI J., SAITO Y.

    Journal of the Japanese Society for Artificial Organs and Tissues   21 ( 2 )   635 - 638   1992.4

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    Using the technique of the fast Fourier transform, the influence of the circuit fluid and the closing pressure to the closing sound of SJM valve was studied by the power-spectrum analysis. Using the water as the test fluid, the power-spectrum curve of the closing sound showed two peaks at the points of 0.8 and 2.5 KHz, but using glycerol, the curve indicated one large peak at 0.7 KHz and a smaller peak at 2.1 KHz, and the power declined over 3 KHz. The power-spectrum curve showed no changes with the closing pressure change from 50 to 1.50 mmHg. By the fibrin glue attachment to the SJM valve ring, the power of each peak declined both in water and in glycerol. This change can be considered to suggest the thrombus formation of the SJM valve in the clinical state. The power-spectrum curve of closing sound of the SJM valve was changed by the circuit fluid, but not changed by the closing pressure.

    DOI: 10.11392/jsao1972.21.635

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  • Automatic correction of left-ventricular pressure waveforms by natural observation system

    Hori, J, Saitoh, Y, Kiryu, T, Hashimoto, R, Asakawa, T, Tamura, K, Iijima, T

    Med. & Biol. Eng. & Comp.   29 ( 2 )   994   1991.7

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  • Frequency spectrum analysis of closing sound of SJM cardiac valve prosthesis in vitro and in vivo. Reviewed

    FUJITA Y., HAYASHI J., MORO H., SAITO A., UENO M., EGUCHI S., HORI J., SAITO Y.

    Journal of the Japanese Society for Artificial Organs and Tissues   20 ( 3 )   915 - 918   1991.6

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    The closing sound of the SJM cardiac valve prosthesis was analysed both in vitro and in vivo, using the technique of the fast Fourier transform. In vitro, the power-spectrum curve of the closing sound contains a peak at 0.6 KHz, and the power gradually decline to 7 KHz. It also has small peaks at about 1.2, 1.8, 2.4 and 3.6 KHz. In vivo, the spectra of the normally functioning SJM cardiac valve prostheses show the same curve as the curve in vitro. In the case of the cardiac valve prosthesis attached with fibrin glue on the housing, the power declined to between 0.6 and 3 KHz. The same curve was shown clinically in two cases of the thrombosed SJM cardiac valve prosthesis and thromboembolism. The decline of the power between 0.6 and 3 KHz suggests the throm-bus or pannus formation of the SJM cardiac valve prosthesis.

    DOI: 10.11392/jsao1972.20.915

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    Other Link: http://search.jamas.or.jp/link/ui/1992029100

  • Improvement of the frequency responses of ambulatory ECG system by the natural observation method

    Hori, J, Saitoh, Y, Kiryu, T, Tamura, K, Asakawa, T, Iijima, T

    Proc. Far Eastern Conf. Med. & Biol. Eng.   174 - 175   1990.10

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  • Automatic correction of pressure waveforms in a catheter transducer system by natural observation method

    Hori, J, Saitoh, Y, Kiryu, T, Tamura, K, Asakawa, T, Iijima, T

    Proc. Far Eastern Conf. Med. & Biol. Eng.   8 - 9   1990.10

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  • Improvement of the frequency responses in an ambulatory ECG system by the natural observation method Reviewed

    Hori, J, Saitoh, Y, Kiryu, T, Asakawa, T, Tamura, K, Iijima, T

    Frontiers Med. & Biol. Eng.   2 ( 2 )   137 - 145   1990.4

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  • Frequency spectrum analysis of SJM cardiac prosthetic closing sound at mitral position.

    FUJITA Y., HAYASHI J., MORO H., SAITO A., UENO M., EGUCHI S., HORI J., SAITO Y.

    Journal of the Japanese Society for Artificial Organs and Tissues   19 ( 1 )   382 - 385   1990

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    The closing sounds of eleven St. Jude Medical cardiac prostheses at mitral position were analysed using the technique of the fast Fourier transform. The frequency-spectra contain a peak at about 1KHz, and decline the power to 5 to 7KHz. In two patients, 8.3 years and 4.5 years postoperatively, their frequency spectra of one leaflet showed a dip at 2.5KHz, respectively. The closing sound analysis is a useful methodd for the early detection of thrambosed SJM cardiac prosthesis at mitral position as well as at aortic or pulmonary position.

    DOI: 10.11392/jsao1972.19.382

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  • Frequency spectrum of SJM cardiac prosthetic closing sound.

    FUJITA Y., HAYASHI J., MORO H., EGUCHI S., HORI J., SAITO Y.

    Journal of the Japanese Society for Artificial Organs and Tissues   18 ( 2 )   694 - 697   1989

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    The closing sound of seven St. Jude Medical (SJM) cardiac prostheses were analysed for the power content as a function of frequency using the technique of the fast Fourier transform. The frequency specutra of normal SJM cardiac prostheses were seen to contain a peak at 1.2KHz, and decline the power to 7.5KHz at aortic position. The frequency specutra of the leaflet, opening angle of which were decreased, were seen to contain a dip at 2.5KHz at aortic and pulmonary position. Otherwise, the spectra of another one were seen to contain no dips. The dip at 2.5KHz gave useful information about the SJM cardiac prosthetic malfunction.

    DOI: 10.11392/jsao1972.18.694

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  • Correction of Pressure Waveforms in a Catheter Manometer System by Natural Observation Method Reviewed

    Yoshiaki Saitoh, Jun-Ichi Hori, Tohru Kiryu, Hideo Makino, Kohji Tamura, Tetsuyo Yoshizaki, Taizo Iijima

    Japanese journal of medical electronics and biological engineering   26 ( 3 )   133 - 138   1988

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    Pressure waveforms obtained by catheter manometer systems are often distorted by resonance of catheter and so on. Corrections by Fourier analysis, low pass filter and digital signal proccessing have been reported, but they have never been put to practical use. We paid attention to the transfer function of catheter transducer systems and made a trial system that correct the distortion by natural observation method. This system increases the bandwidth in frequency domain and reduce the ringing in time domain. Advantages of this system are simple composition, a small number of adjusting points and real time performance without modifying the catheter or transducer. In an animal experiment, we corrected by our trial system the output waveforms recorded by a conventional catheter manometer system and compared these corrected output waveforms with catheter-tip manometer waveforms which are relatively distortionless. As a result, we could obtain less distorted pressure waveforms in left-ventricle and aorta and distinctly confirm dicrotic notch in aortic pressure waveforms. © 1988, Japanese Society for Medical and Biological Engineering. All rights reserved.

    DOI: 10.11239/jsmbe1963.26.133

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Books

  • 次世代インタフェース開発最前線

    堀潤一( Role: Joint author ,  眼電図を用いたコミュニケーション支援用入力インタフェースの開発)

    エヌ・ティー・エス  2013.6 

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  • Wiley Encyclopedia of Biomedical Engineering, vol. 2

    He, B, Hori, J, Babiloni, F, Akay, M. ed( Role: Joint author ,  Electroencephalography (EEG): Inverse Problems)

    John Wiley and Sons  2006.1 

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  • Effect of voluntary paced breathing on non-REM sleep index of Hsi

    117 ( 507 )   51 - 56   2018.3

  • 小特集「人と機械をつなぐ視座」非侵襲脳内電気活動イメージング

    堀潤一

    シミュレーション   30 ( 2 )   90 - 95   2014.6

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  • タブレット端末操作を想定した眼球運動によるコミュニケーション支援装置の高精度化

    風間郁人, 堀潤一, 丹下裕

    信学技報   113 ( 222 )   1 - 6   2013.9

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  • Brain Functional Imaging and Its Application Using Dipole Layer

    Junichi Hori

    J. Soc. Instrument Control Eng.   50 ( 5 )   338 - 343   2011.5

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  • PC Class in Niigata University for the visually impaired

    MAEDA Yoshinobu, HAYASHI Toyohiko, HORI Junichi, ISHIWATARI Hiroki, IWAKI Mamoru, WATANABE Tetsuya, YAMAGUCHI Toshimitsu

    IEICE technical report   109 ( 152 )   27 - 32   2009.7

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    Department of Biocybernetics, Faculty of Engineering, Niigata University, opened a PC class for the visually impaired who lived in Niigata Prefecture, in cooperated with Niigata Prefectural Association of the Visual Impairment, in 2003. So far, we have had twelve classes for six years. In this technical report, we reported this PC class, which is one of the contribution of Niigata University to the visually impaired.

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  • 新潟大学工学部福祉人間工学科 堀潤一研究室

    堀潤一

    LIFE-mag   2   40 - 41   2008.10

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  • 最先端シリーズ⑬夢を現実に

    堀潤一

    タカマツニュース   2008 ( 69 )   1 - 1   2008.7

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  • 11.EOGを用いた文字入力インタフェースの開発(第25回甲信越支部大会抄録)

    坂野 幸治, 堀 潤一, 斉藤 義明

    生体医工学 : 日本エム・イー学会誌   44 ( 2 )   323 - 323   2006.6

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  • 7.無意識生体信号検出装置における呼吸及び心拍動波形の抽出(第25回甲信越支部大会抄録)

    水口 しのぶ, 斉藤 義明, 堀 潤一

    生体医工学 : 日本エム・イー学会誌   44 ( 2 )   322 - 322   2006.6

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  • 1.癌温熱治療用立体空洞共振器の基礎研究 励振アンテナの設置箇所の検討(第25回甲信越支部大会抄録)

    佐藤 剛史, 斉藤 義明, 堀 潤一

    生体医工学 : 日本エム・イー学会誌   44 ( 2 )   321 - 321   2006.6

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  • 10.頭部実形状を考慮した脳皮質電位イメージング運動関連電位へ応用(第25回甲信越支部大会抄録)

    三輪 俊成, 堀 潤一, 斉藤 義明, He Bin

    生体医工学 : 日本エム・イー学会誌   44 ( 2 )   323 - 323   2006.6

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  • 注視点情報を用いた適応型読書拡大器の試み

    宮澤洋一, 宮川道夫, 前田義信, 堀潤一, 玉木徹, 岡本明, 田中正太郎, 小熊隆史, 武田紗路, 青柳真人

    日本生体医工学会大会プログラム・論文集   45th   585   2006.5

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  • 9. 温度計測可能な寝姿検出装置の開発(第24回甲信越支部大会, 支部大会抄録)

    久松 哲也, 斉藤 義明, 堀 潤一

    生体医工学 : 日本エム・イー学会誌   43 ( 2 )   332 - 332   2005.6

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  • 8. 生体情報保護に利用可能な物理乱数発生装置(第24回甲信越支部大会, 支部大会抄録)

    前川 治子, 斉藤 義明, 堀 潤一

    生体医工学 : 日本エム・イー学会誌   43 ( 2 )   332 - 332   2005.6

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  • A Study on the CCTV System with Gazing Point Tracking Ability

    MAEDA YOSHINOBU, MAEDA YOSHINOBU, OGUMA TAKASHI, ISHIGURO TAKASHI, MIYAKAWA MICHIO, MIYAKAWA MICHIO, TAMAKI TOORU, HORI JUN'ICHI, HORI JUN'ICHI

    ヒューマンインタフェースシンポジウム論文集   2005 ( 1 )   241-244   2005

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    J-GLOBAL

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  • Studies on the Effective Use of Gazing Point Information for the CCTV Reading System

    TANAKA SHOTARO, MAEDA YOSHINOBU, MAEDA YOSHINOBU, MIYAKAWA MICHIO, MIYAKAWA MICHIO, TAKEDA SACHI, AOYAGI MASATO, TAMAKI TOORU, HORI JUN'ICHI, HORI JUN'ICHI

    ヒューマンインタフェースシンポジウム論文集   2005 ( 2 )   845-848   2005

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  • Improvement of Averaging Techniques in Auditory Brainstem Evoked Response (ABR)

    KUWABARA Yuki, HORI Junichi, SAITOH Yoshiaki

    IEICE technical report. ME and bio cybernetics   103 ( 327 )   19 - 24   2003.9

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    In the case of hearing examinations for abnormalities and fitting of a hearing aid, auditory brainstem evoked response (ABR) is often measured in clinical situations. In order to detect the ABR, a subject has to be given more than 1,000 hearing stimuli. We considered that the number of stimuli might be reduced by multi-channel measurements. Moreover, the accuracy of averaging was improved by verifying the accuracy of data for every stimulus. 9 channel ABR signals around the top of the head were measured in conducted experiments. Every ABR data of 10ms after the stimuli were statistically evaluated, and only the data suitable for averaging were selected. Although the number of averaging was very few, the ABR waveforms, which were equivalent to that of the conventional averaging, were obtained.

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    Other Link: http://search.jamas.or.jp/link/ui/2004071040

  • 9.客観的聴覚評価のための聴性脳幹反応(ABR)の自動解析の検討(平成14年度甲信越支部・北陸支部合同大会抄録)

    桑原 由希, 堀 潤一, 斉藤 義明

    生体医工学 : 日本エム・イー学会誌   41 ( 1 )   71 - 71   2003.3

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  • 2.電極挿入型ハイパーサーミアの加温領域の拡大法について(平成14年度甲信越支部・北陸支部合同大会抄録)

    渡辺 秀人, 斉藤 義明, 堀 潤一

    生体医工学 : 日本エム・イー学会誌   41 ( 1 )   70 - 70   2003.3

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  • 7.信号と雑音の統計的性質を考慮した空間逆フィルタによる脳内ダイポールイメージング(平成14年度甲信越支部・北陸支部合同大会抄録)

    大類 稔, 堀 潤一, 斎藤 義明, Bin He

    生体医工学 : 日本エム・イー学会誌   41 ( 1 )   70 - 71   2003.3

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  • 15.パラメトリック射影フィルタを用いた時空間脳内ダイポールイメージング(平成14年度甲信越支部・北陸支部合同大会抄録)

    相場 雅彰, 堀 潤一, 斉藤 義明, Bin He

    生体医工学 : 日本エム・イー学会誌   41 ( 1 )   72 - 72   2003.3

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  • 6.母体体表面より誘導する胎児心電図測定の検討(平成14年度甲信越支部・北陸支部合同大会抄録)

    鈴木 愛, 斉藤 義明, 堀 潤一

    生体医工学 : 日本エム・イー学会誌   41 ( 1 )   70 - 70   2003.3

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  • 4.X線医療画像におけるブレ画像の抽出と復元(平成14年度甲信越支部・北陸支部合同大会抄録)

    平林 章広, 堀 潤一, 斉藤 義明, 木竜 徹, 岡本 浩一郎

    生体医工学 : 日本エム・イー学会誌   41 ( 1 )   70 - 70   2003.3

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  • Generation of Physical Random Number with Variable-Capacitor Parametron

    SAITOH Yoshiaki, HORI Junichi, NISHIMURA Hiroshi, KIRYU Tohru

    IEICE transactions on fundamentals of electronics, communications and computer sciences   85 ( 2 )   526 - 526   2002.2

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    In the present study, random number generator, which physically produces non-periodic uniform random number, was developed using the principle of parametron. The parametron is the oscillation circuit of one half of the excited frequency. The phase of the parametron cannot predict because it is decided by the noise in the parametron circuit. The random number was generated by detecting the unpredictable phase. The randomness of the data generated by the present method was confirmed by the space distribution and statistical random tests.

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  • Analysis of Hyperthermic Treatment using a Improved Reentrant Resonant Cavity Application

    IMAI Yutaka, HORI Junichi, SAITOH Yoshiaki, KANAI Yasushi

    IEICE technical report. ME and bio cybernetics   98 ( 94 )   71 - 78   1998.5

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    Reentrant resonant cavity applicator has been developed to obtain both a deep and concentrated heat for hyperthermic treatment. Moveover, the applicator was imporved for the purpose of realizing more effective heat for the subject with human body size. That is, the upside projection (reentrant) was separated from the applicator to approch to the downside projection. In this paper, we analyzed the modefied resonant cavity applicator by unified finite-difference method of electromagnetic field - heat transfer equations. As a result compared with measured temperature distributions, similar temperature distributions, the temperatures in a center and surroundings of the subject, are higher than the others. This paper suggested to be able to design more effective applicator by making suitable discrete data for resonant cavity applicator.

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  • 食塩水を併用した針電極組織内加温の検討

    斎藤 義明, 堀 潤一, 市田 隆文, 松田 康伸, 渡辺 雅史

    日本ハイパーサーミア学会誌   13 ( 4 )   245 - 245   1997.12

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  • Nonlinear Auditory Model by Normal Natural-Observation Filter

    TAKAHASI Hideki, SAITOH Yoshiaki, HORI Jun-ichi, KIRYU Tohru

    IEICE technical report. ME and bio cybernetics   96 ( 257 )   63 - 70   1996.9

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    A quasi-auditory filter based on normal natural-observation filter was proposed by Iijima for acoustic analysis or speech recognition. This filter did not realize nonlinear signal processing. observed in human auditory filter. In this study, we propose nonlinear auditory model by expanding the first-order fundamental element of normal natural-observation filter to second-order and introducing Q, that depends on the level of the input signal. The nonlinearity and the bandwidth of proposed filter are in good agreement with that of the human auditory filter.

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  • Band-Limited Image Restoration by Finite-Term Filter

    OGAWA Yasuei, SAITOH Yoshiaki, HORI Jun-ichi, KIRYU Tohru

    IEICE technical report. ME and bio cybernetics   96 ( 257 )   55 - 62   1996.9

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    Observed images are often degrated by the insufficient characteristics of the observation system. In this study we restore an original image from the degrated image, assuming that a degrated function is known and parameters that express a degration degree are unknown. A restoration filter for time-varying signal, which restored a band-limited signal on the original one, has been constructed by the finite-term filters. We expand this filter to the two-dimensional band-limited restoration filter, theoretically. The restoration results were evaluated by simulation, while considering the influence of additional noise.

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  • Image Restoration with the Natural-Observation Method Using Several Types of Degrated Functions

    OGAWA Yasuei, SAITOH Yoshiaki, HORI Jun'ichi, KIRYU Tohru

    IEICE technical report. ME and bio cybernetics   95 ( 285 )   17 - 24   1995.9

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    Observed images are often degrated by an observation system. In this study we restore original images from degrated images, assuming that degrated functions are known and parameters that express a degrated degree are unknown. Original images are usually restored by the estimated parameters, but the estimates contained the error. Then, we applied the two-dimensional natural-observation method for compensating the estimation error. We estimated the parameters of degrated functions and the natural-observation coefficients, using a step image as a reference image. The results were evaluated by the estimation error of parameters for typical shift-invariant degrated functions such as Butterworth-type, Gaussian function, and Sinc function.

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Awards

  • 令和元年度「障害者の生涯学習支援活動」に係る文部科学大臣表彰

    2019.12   文部科学省   「視覚障がい者のためのパソコン講習」

    工学部工学科人間支援感性科学プログラム

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  • 第4回アジア工学教育会議ベストポスター発表賞

    2014.10   アジア工学教育会議   Simultaneous electroencephalographic and electrocorticographic measurements of brain activity in a monkey

    M. Koide, C. Saito, T. Tosaka, I. Hasegawa, J. Hori, A. Iijima

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  • 2005年度工学部教育賞

    2006.3   新潟大学工学部   地域連携による学生の実践的教育と社会貢献を目的とした「視覚障害者のためのパソコン講習」の実施

    前田義信, 中村康雄, 清水年美, 堀潤一, 林豊彦

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  • 第5回日本エム・イー学会若手研究者報告会優秀賞

    1990.10   日本エム・イー学会  

    堀 潤一

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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Research Projects

  • 機械的触覚刺激による事象関連電位を用いた意図情報の抽出

    2014.4 - 2017.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    堀潤一

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3800000 ( Direct Cost: \2660000 、 Indirect Cost:\1140000 )

    言葉や動作によるコミュニケーションの代替として,視聴覚に頼らないインタフェースが望まれる.本研究では,触覚刺激を提示した時の脳電気活動より,ユーザの意図情報を抽出するブレインコンピュータインタフェースを開発する.そのために,①機械的触覚刺激装置を用いた意思伝達システムを構築し,②触感覚に関する事象関連脳電位の諸特性を調査し,③被験者による評価をもとにシステムを改良する.具体的には,低頻度刺激に注目することで特徴的な脳活動を示すオドボール課題を触覚刺激用に改良し,ニュートラル状態からYes, Noの高精度判別を目指す.

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  • 障害者のための汎用ヒューマンインタフェース

    2014.1

    信越化学工業株式会社  受託研究(一般受託研究) 

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    Grant type:Competitive

    Grant amount:\500000

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  • ICT(情報通信技術)とピエゾセンサーを融合した在宅嚥下機能評価訓練システム開発

    2013.4 - 2016.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    櫻井直樹

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    Grant type:Competitive

    Grant amount:\30000 ( Direct Cost: \30000 )

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  • フィールドでの脳機能計測を可能とする時空間脳内ダイポールイメージング

    2010.4

    ケー・ジー・エス株式会社  共同研究(学内共同研究) 

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    Grant type:Competitive

    フィールドでの脳機能計測を可能とする時空間脳内ダイポールイメージングに関する研究.機材提供(温度刺激装置)

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  • 在宅高齢者に対するピエゾセンサーを用いた遠隔嚥下機能評価訓練システムの開発

    2010.4 - 2013.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    櫻井直樹

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    Grant type:Competitive

    Grant amount:\40000 ( Direct Cost: \40000 )

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  • 自然環境下で感覚情報の客観計測を可能とする脳内ダイポールイメージング

    2010.4 - 2013.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

    Grant amount:\2900000 ( Direct Cost: \2030000 、 Indirect Cost:\870000 )

    自然環境下で感覚情報の客観計測を可能とする脳内ダイポールイメージングについて研究を実施する.

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  • 生体情報を用いた支援機器に関する研究

    2005.4

    その他の研究制度 

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    Grant type:Competitive

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  • 高精度脳内可視化手法を用いたブレインコンピュータインタフェースの開発

    2005.4 - 2007.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

    Grant amount:\3600000 ( Direct Cost: \3600000 )

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  • 物理乱数生成法に関する研究

    2001.4

    その他の研究制度 

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    Grant type:Competitive

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  • 仮想ダイポールレイヤーを用いた時空間高精度脳機能マッピング

    2001.4 - 2004.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Grant type:Competitive

    Grant amount:\1200000 ( Direct Cost: \1200000 )

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  • 高精度脳電気活動イメージングに関する研究

    1999.10

    その他の研究制度 

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    Grant type:Competitive

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  • 癌温熱治療装置に関する研究

    1995.4

    その他の研究制度 

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    Grant type:Competitive

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  • 生体計測と解析に関する研究

    1990.4

    その他の研究制度 

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    Grant type:Competitive

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  • 生体計測機器の高性能化に関する研究

    1987.4

    その他の研究制度 

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    Grant type:Competitive

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Teaching Experience (researchmap)

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Teaching Experience

  • 創造プロジェクトI

    2022
    Institution name:新潟大学

  • 創造プロジェクトII

    2022
    Institution name:新潟大学

  • 人間支援感性科学概論

    2021
    Institution name:新潟大学

  • 創造プロジェクト基礎

    2021
    Institution name:新潟大学

  • 卒業研修II

    2020
    Institution name:新潟大学

  • 電子回路

    2020
    Institution name:新潟大学

  • 卒業研究II

    2020
    Institution name:新潟大学

  • 卒業研究I

    2020
    Institution name:新潟大学

  • 研究課題調査I

    2020
    Institution name:新潟大学

  • 研究課題調査II

    2020
    Institution name:新潟大学

  • 工学リテラシー入門(融合領域分野)

    2020
    -
    2021
    Institution name:新潟大学

  • リメディアル演習

    2020
    Institution name:新潟大学

  • 卒業研修I

    2019
    Institution name:新潟大学

  • 人間支援感性科学実験III

    2019
    Institution name:新潟大学

  • 人間支援感性科学実験IV

    2019
    Institution name:新潟大学

  • 実践プログラミングII

    2018
    Institution name:新潟大学

  • 実践プログラミングI

    2018
    Institution name:新潟大学

  • 人間支援感性科学実験II

    2018
    Institution name:新潟大学

  • 人間支援感性科学実験I

    2018
    Institution name:新潟大学

  • 福祉情報工学

    2018
    Institution name:新潟大学

  • プログラミング基礎Ⅱ

    2017
    Institution name:新潟大学

  • プログラミング基礎Ⅰ

    2017
    Institution name:新潟大学

  • 人間支援科学特定研究Ⅱ(工業)

    2014
    Institution name:新潟大学

  • 人間支援科学セミナーⅡ(工業)

    2014
    Institution name:新潟大学

  • 卒業研修

    2013
    -
    2019
    Institution name:新潟大学

  • 卒業研究

    2013
    -
    2018
    Institution name:新潟大学

  • 技術英語入門

    2013
    -
    2014
    Institution name:新潟大学

  • 自然科学総論Ⅲ

    2013
    Institution name:新潟大学

  • 人間支援科学文献詳読Ⅰ(工業)

    2013
    Institution name:新潟大学

  • 人間支援科学セミナーⅠ(工業)

    2013
    Institution name:新潟大学

  • 電気情報工学特定研究Ⅲ

    2013
    Institution name:新潟大学

  • 人間支援科学特定研究Ⅰ(工業)

    2013
    Institution name:新潟大学

  • 人間支援科学研究発表(外部発表)

    2012
    -
    2015
    Institution name:新潟大学

  • 人間支援科学セミナーⅡ(情報)

    2012
    -
    2015
    Institution name:新潟大学

  • 人間支援科学特定研究Ⅱ(情報)

    2012
    -
    2015
    Institution name:新潟大学

  • 人間支援科学研究発表演習(中間発表)

    2012
    -
    2015
    Institution name:新潟大学

  • 人間支援科学セミナーⅠ(情報)

    2012
    -
    2015
    Institution name:新潟大学

  • 人間支援科学文献詳読Ⅰ(情報)

    2012
    -
    2015
    Institution name:新潟大学

  • 人間支援科学特定研究Ⅰ(情報)

    2012
    -
    2015
    Institution name:新潟大学

  • 技術日本語演習

    2012
    -
    2013
    Institution name:新潟大学

  • 論文輪講

    2011
    -
    2019
    Institution name:新潟大学

  • 情報機器操作入門

    2011
    -
    2018
    Institution name:新潟大学

  • 機能生理学

    2010
    -
    2012
    Institution name:新潟大学

  • 生体計測

    2009
    Institution name:新潟大学

  • 神経生理工学特論

    2009
    Institution name:新潟大学

  • 福祉人間工学実験II

    2009
    -
    2018
    Institution name:新潟大学

  • 福祉情報技術実習

    2009
    -
    2017
    Institution name:新潟大学

  • 工学リテラシー入門(福祉人間工学科)

    2009
    -
    2016
    Institution name:新潟大学

  • 生体画像信号解析

    2008
    Institution name:新潟大学

  • プログラミング基礎演習

    2008
    -
    2009
    Institution name:新潟大学

  • 運動・コミュニケーション支援技術

    2008
    Institution name:新潟大学

  • スタディスキルズ(福祉人間工学)

    2008
    Institution name:新潟大学

  • プログラミング基礎

    2007
    -
    2017
    Institution name:新潟大学

  • プログラミング基礎実習

    2007
    -
    2017
    Institution name:新潟大学

  • 福祉情報技術入門

    2007
    -
    2016
    Institution name:新潟大学

  • 高福祉社会を支える「生活支援工学」入門

    2007
    -
    2016
    Institution name:新潟大学

  • ユニバーサルデザイン論

    2007
    -
    2009
    Institution name:新潟大学

  • 信号処理I

    2007
    -
    2008
    Institution name:新潟大学

  • 信号処理

    2007
    -
    2008
    Institution name:新潟大学

  • 福祉人間工学実験III

    2007
    -
    2008
    Institution name:新潟大学

  • コンピュータ基礎演習

    2007
    -
    2008
    Institution name:新潟大学

  • 支援機器工学

    2007
    Institution name:新潟大学

  • 生体信号処理論

    2007
    Institution name:新潟大学

  • 生体信号解釈特論

    2007
    Institution name:新潟大学

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