ISHIWATA Shingo

Affiliation

Faculty of Engineering, Division of Intelligent Systems Engineering

Job Title

Associate Professor

Date of Birth

1958

Research Fields, Keywords

Stochastic Resonance, Nonlinear Physics, Soliton, Chemical Oscillation

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ORCID  https://orcid.org/0000-0002-1623-9388

The Best Research Achievement in Research Career 【 display / non-display

The Best Research Achievement in the last 5 years 【 display / non-display

  • 【Published Thesis】 A model of inner hair cell excitation based on interlocking of outer hair cell motility in the hearing  2021.03

    【Published Thesis】 A Model for Resolving the Intensity of Stick-Slip Vibration in the Surface Roughness Detection at a Finger Pad  2020.09

    【Published Thesis】 A model of sound wave detection to lead to inner hair cell excitation in the hearing  2020.03

    【Published Thesis】 Surface roughness detection based on stick-slip vibration of finger pad  2018.09

    【Published Thesis】 Response model of Meissner corpuscle based on the mechanical tsructure in tctile  2022.01

Education 【 display / non-display

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    1990

    Yokohama National University   Division of Materials Science and Chemical Engineering   Doctor Course   Completed

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    1984

    Shizuoka University   Department of Physics   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - Yokohama National University

Campus Career 【 display / non-display

  • 2007.4
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Intelligent Systems Engineering   Associate Professor  

  • 2001.4
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    2007.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Intelligent Systems Engineering   Associate Professor  

  • 2000.7
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    2001.3

    Duty   Yokohama National UniversitySchool of Engineering   Associate Professor  

  • 1990.5
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    2000.6

    Duty   Yokohama National UniversitySchool of Engineering   Research Assistant  

  • 2018.4
     
     

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Associate Professor  

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Academic Society Affiliations 【 display / non-display

  • 2018.8
     
     
     

    日本機械学会

  • 2015.7
     
     
     

    Acoustical Society of Japan

  • 2008.9
     
     
     

    The Robotics Society of Japan

  • 2007.3
     
     
     

    応用物理学会

  • 2003.9
     
     
     

    The Japanese Society for Mathematical Biology

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Research Areas 【 display / non-display

  • Natural Science / Mathematical physics and fundamental theory of condensed matter physics

 

Research Career 【 display / non-display

  • Development of Control Systems based on Stochastic Resonance

    Project Year:

Books 【 display / non-display

  • 連成振り子の運動~振動エネルギーのキャッチボール~

    石渡信吾( Role: Sole author)

    国立大学56工学系学部ホームページ/おもしろ科学実験室 

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    Language:Japanese Book type:Other

    連成振り子の実験を動画で紹介し、共鳴・うなり・局在振動といった振動現象の特徴を解説した。数値シミュレーションのプログラムを公開した。

Thesis for a degree 【 display / non-display

  • 「非線形波動伝播に関する理論的および実験的研究」

    石渡 信吾

    1990.3

    Doctoral Thesis   Single Work  

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    横浜国立大学
    プラズマ、電気回路、流体における非線形波動の理論的解析と実験的研究を行った。プラズマでは2電子温度プラズマおよび負イオンプラズマにおいて、イオン波の変調不安定性を解析し、自己変調・自己集束の起こる条件を特定した。電気回路では正負対称回路を構成し、正負のパルスが同時に伝播可能であることを示し、それらの相互作用を実験的に明らかにした。流体では粘性流体の液膜流の伝播特性を実験的に調べた。

Papers 【 display / non-display

  • Response model of Meissner corpuscle based on the mechanical tsructure in tctile

    Yuki Ichikawa, Kaori Nishiyama, Shingo Ishiwata

    ( 0 )   2022.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers   Joint Work  

  • A model of inner hair cell excitation based on interlocking of outer hair cell motility in the hearing

    Shingo ISHIWATA, Koki HIGASHIHARA

    20201Spring Meeting Acoustical Society of Japan   2021 ( 春季 )   2021.3

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    Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Publisher:Acoustical Society of Japan   Joint Work  

  • A Model for Resolving the Intensity of Stick-Slip Vibration in the Surface Roughness Detection at a Finger Pad

    FUKASAWA Shun, ISHIWATA Shingo, TODA Motofumi

    The Proceedings of Mechanical Engineering Congress, Japan   2020 ( 0 )   S11329   2020.9

    DOI CiNii Research

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers   Joint Work  

  • A model of sound wave detection to lead to inner hair cell excitation in the hearing

    Shingo ISHIWATA, Yuki TAGO, Takumi IWAHARA

    2020 Spring Meeting Acoustical Society of Japan   2020 ( 春季 )   751 - 754   2020.3

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    Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Publisher:Acoustical Society of Japan   Joint Work  

  • Surface roughness detection based on stick-slip vibration of finger pad

    YAMASHITA Hisashi, ISHIWATA Shingo, TODA Motofumi

    The Proceedings of Mechanical Engineering Congress, Japan   2018 ( 0 )   2018.9

    DOI

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers   Joint Work  

    <p>We propose a new model for tactile perception of the finger pad of a human based on the stick-slip vibration. It is known that a frequency of the stick-slip vibration to occur on the contact surface of two hard substances depends on the relative speed to each other, the load applied on the contact surface and the difference between the coefficients of static and kinetic friction. We suppose that similar dependence can be applied to the finger pad with a fingerprint. The validity of our model is shown from the both of an experiment and a numerical simulation. In the experiment, a rubber board with stripe and rectangular shapes is used instead of the fingerprint to get a relationship between the surface roughness and the relative speed, the load on the contact surface and the frequency of stick-slip vibration. As a result, it is shown that the stick-slip vibrations with the same frequency occur in a particular range of the relative speed V and the load W. In the numerical simulation, one-dimensional beam model corresponding to an elastic body with rectangular shapes is investigated in the case of acting only a horizontal shear force. It is shown that the frequency change of stick-slip vibration is remarkable in the range of a small value of <i>V/W</i>.</p>

    Other Link: https://ci.nii.ac.jp/naid/130007619351

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Review Papers 【 display / non-display

  • NHKスペシャルを見て

    石渡信吾

    水素エネルギーシステム   43 ( 1 )   44 - 45   2018.3

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Single Work  

    テレビ番組を基に脱炭素社会における原子力に代わるエネルギー源として、太陽光発電と風力発電を比較し、日本における洋上風力発電の可能性を論じる。

Awards 【 display / non-display

  • 第3回関東工学教育協会賞

    2009.5    

Grant-in-Aid for Scientific Research 【 display / non-display

  • 聴覚システムにおける蝸牛管のモデル化

    2012.4 - 2014.3

    科学研究費補助金  Grant-in-Aid for challenging Exploratory Research

    Investigator(s):石渡信吾

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    Grant type:Competitive

     聴覚における蝸牛管の役割は音波の周波数分解である。内耳に達した音波は蝸牛管内にある長さ35mmの基底膜を振動させる。基底膜は長さ方向に異なる固有振動数を有し、音波の周波数に応じて特定の場所が振動する。基底膜上に並んだ有毛細胞が場所ごとに異なる周波数成分を検出する。人では3個の外有毛細胞と1個の内有毛細胞を一組として、3500組ほどが基底膜上を約10μm間隔で並ぶ。基底膜の振動は1Å以下とされ、外有毛細胞がこの振動に刺激応答して伸縮し振動を増幅させる。内有毛細胞がこれを検出して蝸牛神経へ伝えると考えられてきた。人の可聴域は20Hz-20kHzで、周波数分解能は0.2%程度である。しかし従来のモデルでは、現実の検出感度と波数分解能を説明できない。本研究では確率共鳴の観点から、各要素の生理学的構造に基づいて機能を推定し、高感度・高分解能の検出能力を実現し得るモデルを提案した。人では2kHz前後で蝸牛神経の応答が異なる。これを踏まえて、低音領域では通常の確率共鳴を、高音領域ではさらに引き込み現象を導入する。各外有毛細胞に対して順に異なる自励振動数を与え、それぞれの閾値を高音側に向けて下げて低音側より発火しやすく、ノイズだけで自励振動に近い振動状態に設定する。これに自励振動数に等しい基底膜振動が加わると、引き込みが起こり、位相の揃った極めて高いS/N比の検出が可能となる。次に3つの外有毛細胞が同時に発火したときにのみ内有毛細胞が応答するという同時応答性の仮定を設け、周波数選択性の向上を実現した。これにより基底膜振動のみの周波数分解能を大幅に向上させ、1%の分解能を得た。さらに内有毛細胞の積分応答を閾値の異なる10本の蝸牛神経でノイズ応答させることで強度分解を可能にした。これらを電気回路で構成し検証した。本研究は確率共鳴を通して、感覚器におけるノイズの積極的役割を提示すると共に、回路での実現は人口蝸牛への道を開く。

Presentations 【 display / non-display

  • Response model of Meissner corpuscle based on the mechanical tsructure in tctile

    Kaori Nishiyama, Yuki Ichikawa, Shingo Ishiwata

    2022.1 

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    Event date: 2022.1

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Interlocking model of outer hair cells contraction in human hearing

    Koki Higashihara, Shin OkuyaKoki, Shingo Ishiwata

    2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

  • Response characteristic model of the Meissner corpuscle based on the suspended structure in tactile perception

    Kaori Nishiyama, Yuki Ichikawa, Shingo Ishiwata

    2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

  • A model of inner hair cell excitation based on interlocking of outer hair cell motility in the hearing

    ISHIWATA, Shingo, HIGASHIHARA, Koki

    2021 Spring Meeting Acoustical Society of Japan  Acoustical Society of Japan

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  • A Model for Resolving the Intensity of Stick-Slip Vibration in the Surface Roughness Detection at a Finger Pad

    Shun FUKASAWA, Shingo ISHIWATA, Motofumi TODA

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    We have proposed a new model for tactile perception of finger pads of human based on stick-slip vibrations. When humans rub the surface of an object with their finger, vibrations occur between the finger and the surface of the object. It is said that human detects these vibrations to feel various textures. In the previous study, we observed vibrations when rubbing a rubber with the stripe-like uneven shape instead of the finger on sandpapers. It was found that the frequency and the amplitude of vibration characterize the tactile information. In this study, we explore response characteristics of the Meissner corpuscle by numerical simulation. The FitzHugh-Nagumo equation is employed for the response of the secondary neuron connecting the Meissner corpuscle. As a result, it is found that a sigmoid feature of the Meissner corpuscle explains physiologic laboratory findings well. The neurons are in a noisy environment, according to the stochastic resonance, so that the noise may improve an ability to detect weak signals below the threshold.

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Preferred joint research theme 【 display / non-display

  • 確率共鳴

  • 聴覚

  • 触覚検知

 

Charge of on-campus class subject 【 display / non-display

  • 2022   Mathematics for Physics

    College of Engineering Science

  • 2022   Advanced Seminor in Physics, B

    Graduate school of Engineering Science

  • 2022   Advanced Seminor in Physics, A

    Graduate school of Engineering Science

  • 2022   Advanced Study in Physics

    Graduate school of Engineering Science

  • 2022   Advanced Exercise in Physics

    Graduate school of Engineering Science

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Committee Memberships 【 display / non-display

  • 神奈川県立横須賀高等学校外部評価委員会

    2006.4 - 2013.3  外部評価委員

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    Committee type:Other 

Social Contribution(Extension lecture) 【 display / non-display

  • かながわ発・中高生のためのサイエンスフェア

    Role(s): Lecturer, Planner, Performer

    かながわ発・中高生のためのサイエンスフェア実行委員会  神奈川県横浜市  2018.7

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    Audience: Junior high school students, High school students, Parents/Guardians

    Type:Exhibition

    科学や理工系の実演・体験ブースにおいて、「音を見る!」というテーマで、振動・波動にまつわる共鳴、定在波、分散などの実験を実演した。

  • 神奈川県立座間高校校研究室見学会

    Role(s): Lecturer, Performer

    横浜国立大学高大連携  横浜国立大学  2014.3

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    Audience: High school students

    Type:Extension Lecture

    ゾウリムシの走性行動と確率共鳴の関係を実験・シミュレーションで解説した。

  • 神奈川県立座間高校校研究室見学会

    Role(s): Lecturer, Performer

    横浜国立大学高大連携  横浜国立大学  2012.3

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    Audience: High school students

    Type:Extension Lecture

    ゾウリムシの走性行動と確率共鳴の関係を実験・シミュレーションで解説した。

  • 神奈川県立横須賀高校横高アカデミア第3回講義実施横高アカデミア第3回講義

    Role(s): Lecturer

    神奈川県立横須賀高等学校  横須賀市  2011.7

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    Audience: High school students

    Type:Visiting lecture

    高校1年生に非線形応答分野の確率共鳴現象の研究を紹介した。確率共鳴が単細胞生物であるゾウリムシの適温探索行動のモデルになり得ることを解説した。

  • 平成20年度全学公開講座「不思議がいっぱい科学の世界」

    横浜国立大学  神奈川県横浜市  2008.9

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    Type:Extension Lecture

    平成20年度全学公開講座「不思議がいっぱい科学の世界」において小中学生向けの講座「コマを楽しむ」を実施。回転にまつわる様々な現象を体験させた。

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