Updated on 2024/12/06

写真a

 
KIMOTO Kazushi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • Dr.Eng. ( 2007.6   Tokyo Institute of Technology )

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Civil engineering material, execution and construction management

Education

  • Tokyo Institute of Technology    

    - 2000

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  • Tokyo Institute of Technology   理工学研究科   土木工学専攻

    - 2000

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    Country: Japan

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  • Tokyo Institute of Technology    

    - 1997

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  • Tokyo Institute of Technology   工学部   土木工学科

    - 1997

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    Country: Japan

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Research History

  • Okayama University   環境生命科学学域   Associate Professor

    2021.4

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  • Okayama University   環境生命科学研究科   Associate Professor

    2008.4 - 2021.3

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  • - Tokyo institute of technology research associate

    2000

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  • - 東京工業大学 助手

    2000

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Professional Memberships

Committee Memberships

  • 土木学会 鋼構造委員会 鋼構造物における先進的非破壊検査・評価技術に関する調査研究小委員会   幹事長  

    2022.8 - 2025.7   

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    Committee type:Academic society

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  • 日本鉄鋼連盟土木鋼構造研究ネットワーク   中国・四国地区 代表幹事  

    2021.11 - 2023.11   

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    Committee type:Academic society

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Papers

  • 我が国の鋼橋の超音波探傷試験の現状とNDE4.0への展望(その2) Reviewed

    木本和志, 白旗弘実, 中畑和之, 八木尚人, 判治剛

    非破壊検査   2024.7

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • 我が国の鋼橋の超音波探傷試験の現状とNDE4.0への展望(その1) Reviewed

    木本和志, 白旗弘実, 中畑和之, 八木尚人, 判治剛, 服部雅史, 筒井康平

    非破壊検査   73 ( 7 )   307 - 311   2024.7

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • 畳込みニューラルネットワークを用いた2次元弾性波動場における欠陥の推定 Reviewed

    斎藤 隆泰, 木本 和志

    AI・データサイエンス論文集   4 ( 3 )   265 - 273   2023

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.11532/jsceiii.4.3_265

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  • TIME-REVERSAL FOCUSING OF ELASTODYNAMIC SCATTERED WAVES FROM A CRACK IN A REVERBERATING ENVIRONMENT Reviewed

    Kazushi KIMOTO, Takahiro SAITOH

    Japanese Journal of JSCE   79 ( 15 )   22-15007 - n/a   2023

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejj.22-15007

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  • ANALYSIS OF WATER MOLECULES AND CATIONS DISTRIBUTION IN MONTMORILLONITE INTERLAYER BY MOLECULAR DYNAMICS SIMULATIONS

    Itsuki MORIMOTO, Kazushi KIMOTO, Katsuyuki KAWAMURA

    Japanese Journal of JSCE   79 ( 15 )   22-15038 - n/a   2023

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejj.22-15038

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MISC

  • Study on Effects of Coupled Phenomenon on Long-term Behavior for Crystalline Rock (FY2015) (Contract Research)

    JAEA-research   2016 ( 18 )   巻頭1 - 2,1-23   2016.12

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  • An Approach of Ultrasonic Flaw Imaging in Solid with the Time Reversal Method Assisted by an Image-based Simulation

    NAKAHATA Kazuyuki, KIMOTO Kazushi

    IEICE technical report   111 ( 88 )   1 - 6   2011.6

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    Time reversal techniques with an array transducer are adaptive methods that can be used in nondestructive evaluation to improve flaw detection through heterogeneous media. Here we propose a simulation-aided flaw imaging method combined with the time reversal approach. First scattered waves from a flaw are recorded in the signal matrix of the full-wave sampling and processing (FSAP) technique. Then the time-reversed waves are re-emitted in a numerical simulation. The simulation is based on the finite integration technique (FIT) and image-based modeling. The re-emitted waves propagate through the heterogeneous media and focus on the flaw. The flaw shape can be estimated visually in the simulation through the focal point of the ultrasonic wave.

    CiNii Article

    CiNii Books

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  • シミュレーション波形を使ったTDTG 法による欠陥形状再構成

    土木学会第61回年次学術講演会講演概要集 I   CDROM 1017-1018   2006

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  • 異方性を考慮した高精度な欠陥位置特定

    土木学会第61回年次学術講演会講演概要集 I   CDROM 647-64   2006

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  • TDTG法の欠陥形状再構成問題への適用性に関する基礎的検討

    日本非破壊検査協会平成18年度春季大会講演概要集   105 - 108   2006

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Awards

  • 応用力学論文賞

    2003  

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    Country:Japan

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Research Projects

  • 不飽和ベントナイトの水分浸透モニタリングを目的とした光音響トモグラフィー

    Grant number:22K04289  2022.04 - 2025.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    木本 和志

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    Grant amount:\3380000 ( Direct expense: \2600000 、 Indirect expense:\780000 )

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  • Detection of the Non-Gaussian Phenomena in Civil Engineering Field and Development of Their Analytical Methods

    Grant number:21K04242  2021.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    佐藤 忠信, 木本 和志

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

    土木工学における非正規確率現象を発見し、それを抽出・解析するための方法論を開発し、近代確率過程論の枠組みを超越する新しい確率過程を構築するのが、本研究の主目的である。本年度は、観測加速度時刻歴のフーリエ位相スペクトルの確率特性が非ガウス性を示すことを明らかにした上で、その模擬法を開発し、それが長期記憶過程であることを明かにする。
    最初に、フーリエ位相スペクトルの確率特性が非ガウス性を示すことを明確にし、位相スペクトルの模擬法を確立した。応答スペクトル準拠の加速度時刻歴の形状はフーリエ位相スペクトルに大きく依存するので、観測地震動から位相平均勾配の確率特性を抽出し、それを用いて模擬されるフーリエ位相スペクトルを用い、応答スペクトル準拠の加速度時刻歴を模擬する方法論を確立した。また、初期フーリエ振幅スペクトルの与え方にも任意性が有るので、その設定法についても考察を加えた。多数の設計用応答スペクトル準拠の加速度時刻歴を模擬し、それらを用いて、フーリエ位相スペクトルの不確定性が構造物の非線形応答特性に及ぼす影響を評価した。
    次に、因果性を有する地震動加速度時刻歴のフーリエ変換の虚数部は、ヒルベルト変換を用いて実数部から再構築できることに着目し、加速度時刻歴を模擬できる方法論を開発した。まず、フーリエ変換・実数部の角振動数に関する変動特性を抽出し、それを実数部の「平均変動過程」とする。平均変動過程で実数部を除したものを「標準化実数部過程」と名付け、これが定常な確率過程となることを確認した。さらに,標準化実数部のサンプル過程を自己回帰過程として模擬した。その不確定性は自己回帰過程の予測誤差として評価した。模擬されたサンプル標準化実数部過程に変動過程を乗じて、サンプル実数部過程を求めた。さらに、ヒルベルト変換で虚数部過程を計算し、フーリエ逆変換で因果性を有する加速度時刻歴を多数模擬した。

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  • 鋼床版溶接継手部におけるき裂の高精度非破壊評価に向けた新たな超音波イメージング技術の開発

    2021.04 - 2023.03

    一般社団法人 中国建設弘済会  技術開発支援事業 

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    Authorship:Principal investigator 

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  • Exploration of stochastic phenomena disobeying the central limit theorem and development of innovative stochastic processes in the structural engineering

    Grant number:18K04334  2018.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    SATO Tadanobu

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    The purposes of this research are to discover phenomenon that is expressed by the non-Gaussian stochastic feature and to develop a new stochastic process transcends the frame of the modern stochastic theory. The candidate to detect the non-Gaussian feature is the phase spectrum of acceleration time history. There are three topics in this theme. The first is to make clear the non-Gaussian stochastic characteristic of the mean gradient of phase (an approximation of the group delay time). The next is to develop an algorithm to simulate the phase process, which is called as “the Levy flight process”. We applied this phase process to simulate design response spectrum compatible acceleration time histories. Using the simulated acceleration time history we evaluate nonlinear response characteristics of the structural system. The third is to develop a non-Gaussian stochastic differential equation for simulating the time history of acceleration. We discuss a method to solve this equation.

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  • Ultrasonic tomography for the evaluation of water and density of unsaturated clay

    Grant number:17K06534  2017.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Kimoto Kazushi

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    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

    This study is concerned with the ultrasonic method for the evaluation of water content and bulk density of unsaturated clay. Since acoustic properties of unsaturated clay has not been investigated systematically, we performed ultrasonic transmission test on compacted bentonite clay of various water content and bulk density. As the result, it was found that the ultrasonic wave velocity is correlated highly with the dry density, while the ratio of P- to S-wave velocity increases with the degree of water saturation. The set of ultrasonic velocity data obtained thus can be used to invert ultrasonic data to the water saturation and the dry density. To investigate the feasibility of ultrasonic spectroscopy further, surface waves in heterogeneous clay samples are visualized by a scanning laser ultrasonic detector. The result is encouraging in the sense that the heterogeneity of the sample appears in the measured ultrasonic wave field as the variation in the wave speed.

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Class subject in charge

  • Internship (2024academic year) Summer concentration  - その他

  • Internship (2024academic year) Summer concentration  - その他

  • Fundamental Physics - A Modern Perspective B (2024academic year) special  - その他

  • Laboratory Work for Graduation Thesis (2024academic year) 1st-4th semester  - その他

  • Engineering Mathematics II (2024academic year) 3rd and 4th semester  - 木3~4

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