MURAI Motohiko

Affiliation

Faculty of Environment and Information Sciences, Division of Artificial Environment and Information

Job Title

Professor

Date of Birth

1970

Research Fields, Keywords

Mega-float, Uminokouen, Offshore structure, Utilization of Ocean Energy, Offshore environment, Hydrauric test, Marine Renewable Energy,Ocean Renewable Energy, Human-activity in coastal zone, Shell-digging, Very Large Floating Structure, Tidalland, Hydroelasticity

Mail Address

E-mail address

Related SDGs




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

  • 【Published Thesis】 On the hydroelastic responses of a very large floating structure in waves  1999.12

    【Published Thesis】 Experimental and theoretical analysis of the wave decay along a long array of vertical cylinders  2002.04

    【Published Thesis】 マルチエージェントモデルによる潮干狩り行動の数値シミュレーションに関する研究 －「海の公園」における数値モデル -  2008.12

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

  • 【Published Thesis】 波力発電装置への適用を想定した実用的波強制力予測手法の開発  2018.08

    【Published Thesis】 A Study on Electrical Power for Multiple Linear Wave Energy Converter Considering the Interaction Effect  2018.11

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Education 【 display / non-display 】

  • 　
    -
    1995.3

    The University of Tokyo   Navalarchtects and Ocean engineerings   Master Course   Completed

  • 　
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    1993.3

    The University of Tokyo   Graduated

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Degree 【 display / non-display 】

  • Doctor of Engineering - The University of Tokyo

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Campus Career 【 display / non-display 】

  • 2021.4
    　
    　

    Duty   Yokohama National UniversityFaculty of Environment and Information Sciences   Division of Artificial Environment and Information   Professor  

  • 2007.4
    -
    2021.3

    Duty   Yokohama National UniversityFaculty of Environment and Information Sciences   Division of Artificial Environment and Information   Associate Professor  

  • 2001.4
    -
    2007.3

    Duty   Yokohama National UniversityResearch Institute of Environment and Information Sciences   Division of Social Environment and Information   Associate Professor  

  • 1999.4
    -
    2001.3

    Duty   Yokohama National UniversityGraduate School of Engineering   Associate Professor  

  • 2021.4
    　
    　

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mechanical Engineering, Materials Science and Ocean Engineering   Professor  

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External Career 【 display / non-display 】

  • 2007.4
    -
    2009.3

     

  • 1997.8
    -
    1999.3

    Reserch Associate, University of Tokyo Faculty of Engineering Department of Naval Architecture and Ocean Engineering   Research Assistant  

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Academic Society Affiliations 【 display / non-display 】

  • 2015
    　
    　
     

    日本海洋政策学会

  • 2011.7
    　
    　
     

    Japanese Association for Coastal Zone Studies

  • 　
    　
    　
     

    日本船舶海洋工学会

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Research Areas 【 display / non-display 】

  • Others / Others  / Ocean environmental engineering

  • Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Marine engineering

  • Others / Others  / Ocean engineering

  • Others / Others  / Hydromecanics

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Research Career 【 display / non-display 】

  • A Study of a ocean space utilization

    Project Year：

  • マルチエージェントアルゴリズムによる動態解析

    Project Year：

  • Evaluation of Ocean Environment at Artificial tideland cosidering with human impacts

    Project Year：

  • Development of experiment methods on a very large floating structure in a very small water tank

    Project Year：

  • A Study on Hydroelastic behaviour of a Very Large Floating Structure

    Project Year：

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Books 【 display / non-display 】

  • Ship Geometry and Fundamentals of Hydrostatics (Naval Architecture and Ocean Engineering Series 1

    Ikeda Yoshiho, Yoshitaka Furukawa, Toru Katayama, Tokihiro Katsui, Motohiko Murai, Satoru Yamaguch（ Role： Joint author）

    SEIZANDO  （ ISBN:9784425714360 ）

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    Total pages：169   Responsible for pages：1-169   Language：English Book type：Scholarly book

  • Environmental Management of Marine Ecosystems

    Md. Nazrul Islam, Sven Erik Jorgensen（ Role： Joint author ,  Inclusive Impact Index 'TripleI'）

    CRC Press  （ ISBN:9781498767729 ）

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    Responsible for pages：31-64   Language：English Book type：Scholarly book

    https://www.crcpress.com/Environmental-Management-of-Marine-Ecosystems/Islam-Jorgensen/p/book/9781498767729

  • 船舶海洋工学シリーズ①　船舶算法と復原性

    池田 良穂・古川 芳孝・片山 徹・勝井 辰博・村井 基彦・山口 悟（ Role： Joint author）

    成山堂書店  （ ISBN:9784425714315 ）

    Amazon

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    Total pages：184   Language：Japanese Book type：Scholarly book

  • 船舶一問一答

    （ Role： Joint author）

    海事プレス 

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    Language：Japanese Book type：Scholarly book

  • 実践　浮体の流体力学　前編－動揺問題の数値計算法

    柏木正、高木健、肥後靖、村井基彦、吉田尚史（ Role： Joint author）

    成山堂  （ ISBN:4425713214 ）

    Amazon

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    Total pages：291   Language：Japanese Book type：Scholarly book

    平成１５年日本造船学会賞　発明考案部門

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Thesis for a degree 【 display / non-display 】

  • 超大型浮体の波浪中流力弾性挙動の推定法に関する研究

    村井基彦

    1999.1

    No Setting   Single Work    [Reviewed]

  • 大型浮体式構造物の流力弾性挙動の推定法に関する研究

    村井基彦

    1995.3

    No Setting   Single Work    [Reviewed]

  • 応答制御を用いた大水深ライザーのエントリー／リエントリー

    宇佐美陽生, 村井基彦

    1993.3

    No Setting   Joint Work    [Reviewed]

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Papers 【 display / non-display 】

  • Engineering Possibility Studies of a Novel Cylinder-Type FOWT Using Torus Structure with Annular Flow

    Liu Xiaolei, Murai Motohiko

    ENERGIES   15 ( 13 )   2022.7

    DOI Web of Science

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

  • A Basic Study on the Effect of Deep Learning to Determine the Control Force to Maximize the Power Generation of PA-WEC in Irregular Waves

    Motohiko MURAI, Sho SAKAMOTO

    Proc. of ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering   ( OMAE2022-785 )   2022.6  [Reviewed]

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The American Society of Mechanical Engineers (ASME)   Joint Work  

    Marine renewable energy is expected as an alternative energy source to fossil fuel. Wave energy is one of the marine renewable energy. The subject of this paper is maximizing power generation by a Point Absorber Wave Energy Converters (PA-WEC) in irregular waves. In the previous study on maximizing the power generation by one of the authors, it has been shown the theoretical solution of the time-domain control force in irregular waves which are defined by superposing regular waves components. That is, if the PA-WEC can simultaneously understand the irregular incident waves as multi certain regular wave components, it can be decided the control force for maximizing the power generation. On the other hand, it is quite difficult to predict precisely and simultaneously the component of coming irregular waves to a PA-WEC installed in the ocean.

    In the recent, Artificial Intelligence (AI) and machine learning technology progress rapidly. In the machine learning system, because reading huge data with the relation among them, sometimes it finds out the path connecting A matter and B matter without visible theoretical or logical relations. In this case, the quality of a training data is quite important for accuracy or certainty of the efficient prediction.

    In this paper, we examine the possibility of applying AI to predict and decide the control force for maximizing the power generation of the PA-WEC in irregular waves. Some of the results given by the AI has been quite close to the theoretical answer in irregular waves. Through the examination, we investigate and discuss the best or the effective combination of training data sets which are based on the theoretical situation in known waves.

  • A Fundamental Study on the Potential of AI Prediction in Control Force Estimation to Maximize Power Generation of PA-WECs in Irregular Waves

    Murai Motohiko, Sakamoto Sho

    Journal of the Japan Society of Naval Architects and Ocean Engineers   ( 0 )   2022.6  [Reviewed]

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Naval Architects and Ocean Engineers   Joint Work  

    Marine renewable energy is expected to replace fossil fuels as an energy source. Wave energy is one of these marine renewable energy sources. A floating point-absorber wave energy converter (PA-WEC) is a wave energy generation system that is expected to be utilized because of its low mechanical loss and lack of wave directionality. Many studies have been conducted to maximize the power generation of PA-WECs, and theoretical solutions have been presented for the maximum expected value of power generation and its control in regular waves and known irregular waves. However, the components of the incoming irregular waves are not known when the system is actually installed on the ocean. Therefore, in this study, a basic investigation of the possibility of applying AI to predict and determine the control power to maximize the power generation of PA-WEC is conducted. In this investigation, we have narrowed down the focus to the possibility of estimating the optimal control power from time to time, and investigated and discussed the effective combination of training data sets based on theoretical situations in known waves.

    Other Link： https://ci.nii.ac.jp/naid/130008081001

  • Nurturing and Creating the Next Generation of Marine Industry, the Key to Realizing a Decarbonized Society

    Motohiko MURAI

    The 29th Ocean Engineering Symposium   OES29-078   2022.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (research society, symposium materials, etc.)   Publisher：J F O E S & J A S N A O E   Single Work  

    This paper introduces the second proposal of “Appeal for realizing integrated management of marine and coastal　areas: Policy proposal for the 4th Basic Plan of Ocean Policy”, which was published by the Japan Society of　Ocean Policy (JSOP) and Japanese Association for Coastal Zone Studies (JACZS). Of the five major recommendations contained in the report, this presentation will discuss the purpose of "Proposal 4: Nurture and Create Next-Generation Marine Industries as the Key to Realizing a Decarbonized Society" and the awareness of the issues that emerged during the discussion.

  • Basic Study on Offshore Connection of Rectangular Floating Structures in Block Method for Floating Wind Turbines

    Shuto KONDO, Motohiko MURAI

    The 29th Ocean Engineering Symposium   OES29-062   2022.3

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    Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (research society, symposium materials, etc.)   Publisher：J F O E S & J A S N A O E   Joint Work  

    Offshore wind power generation is expanding all over the world, especially in Europe, and is a method of power generation that will expand in Japan as we work toward becoming carbon neutral by 2050. In the construction of offshore wind turbines, the block construction method, rather than the conventional integrated construction method, allows for more efficient transportation and short-term assembly. In this study, I will investigate the possibility of constructing a floating structure consisting of several units, which are then jointed together at sea to form an offshore wind turbine.

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Review Papers 【 display / non-display 】

  • 海洋エネルギー発電装置の開発と環境　第2回（1）海流・潮流発電　─近年の動向─

    村井基彦

    日本船舶海洋工学会誌 KANRIN（咸臨）   ( 86 )   2019.9

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本船舶海洋工学会   Single Work  

  • フォーカス 海洋エネルギーによる地域振興で東北復興を！

    村井基彦

    日本船舶海洋工学会誌 KANRIN（咸臨）   ( 42 )   2012.5

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本船舶海洋工学会   Single Work  

  • 流体─構造連成問題　メガフロートの流体・構造連成問題 ─巨大さ故の課題─

    村井基彦

    日本船舶海洋工学会誌 KANRIN（咸臨）   ( 25 )   2009.7

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本船舶海洋工学会   Single Work  

  • 若い技術者に魅力のある造船技術・造船事業のために

    日本船舶海洋工学会   ( 3 )   81 - 84   2006.11

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Joint Work  

  • 画像処理による波高計測

    KANRIN   ( 4 )   51 - 56   2006.1

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

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Works 【 display / non-display 】

  • Muti-arrays supported very large floating Structure

    2000

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    Work type：Other  

  • 特許「多列浮体支持型大型浮揚構造物」

    2000

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    Work type：Other  

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Industrial Property Rights 【 display / non-display 】

  • 波力発電装置

    村井基彦 、藤田修 、藤本大道

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    Applicant：国立大学法人横浜国立大学

    Application no：2009-165954  Date applied：2009.7.14

    Announcement no：2011-024315  Date announced：2011.2.3

    Country of applicant：Domestic  

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Awards 【 display / non-display 】

  • The Best Paper Award 2020 of Japanese Association for Coastal Zone Studies

    2020.9   Japanese Association for Coastal Zone Studies   Trend and consideration on the changes in population density of short neck clam at 'Umino-Kouen'

    Individual or group name of awards：Motohiko MURAI

  • OMAE 2019 Best Paper Award of Takeshi Kinoshita Honoring Symposium on Offshore Technology

    2020.8   ASME   Study on the Generated Power Changes by the Relation Between an Arrangement of an Array of Point Absorber Type WECs and an Incident Wave Angle (OMAE2020-95400)

    Individual or group name of awards：Motohiko Murai, Qiao Li, Junki Funada

  • OMAE 2015 Best Paper Award of Ocean Space Utilization

    2016.6   ASME   Comparison of Weathervane Performance Between Two Types of FOWT Systems Moored to SPM (OMAE2015-41137)

    Individual or group name of awards：Kazuhiro Iijima, Yuiko Kuroda, Yasunori Nihei, Motohiko Murai

  • 平成１８年日本船舶海洋工学会　東部支部春季講演会　若手優秀講演賞

    2006.5    

  • 日本造船学会奨励賞（乾賞）

    2001.5    

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

  • AIモデルを活用した波浪発電浮体アレイの不規則波中での実践的発電効率向上化

    Grant number：2 2 H 0 1 6 9   2022.4 - 2026.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s)：村井基彦

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    Grant type：Competitive

    2,200,000 3,800,000

  • 不規則波中の波浪発電浮体アレイの発電ポテンシャルを引き出す実用的制御手法の検討

    2018.4 - 2021.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s)：村井基彦

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    Grant type：Competitive

  • 水中プラットフォームを用いた浮体式洋上ウィンドファームの開発に関する基礎研究

    2013.4 - 2016.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s)：村井基彦

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    Grant type：Competitive

  • 極低温液体貨物を貯蔵する浮体式海洋構造物の安全性評価法の開発

    2012.4 - 2016.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s)：荒井誠

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    Grant type：Competitive

  • 低温液化ガス運搬用船舶の安全性に関する研究

    2008.4 - 2011.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s)：荒井誠

    　 More details

    Grant type：Competitive

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Other external funds procured 【 display / non-display 】

  • 風力発電等導入支援事業／環境アセスメント調査早期実施実証事業／環境アセスメント迅速化研究開発事業（順応的管理手法の開発）

    2015.4 - 2018.3

  • 海洋エネルギー技術研究開発／次世代海洋エネルギー発電技術研究開発／ リニア式波力発電

    2015.3 - 2018.3

    NEDO  海洋エネルギー技術研究開発／次世代海洋エネルギー発電技術研究 開発／リニア式波力発電

  • 多数浮体による浮体式海洋発電ファームの浮体配置と位置保持に関する研究

    2013.6 - 2016.3

    Local Government  造船学術研究推進機構研究奨励

    Investigator(s)：村井基彦

  • 浮体式風力発電設備の波浪中応答評価に関する研究

    2012.9 - 2013.2

    Private Foundations 

    Investigator(s)：村井基彦

  • 洋上風力発電の性能評価・安全性評価に関わる研究

    2011.11 - 2013.1

    Local Government 

    Investigator(s)：二瓶泰典

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Presentations 【 display / non-display 】

  • Nurturing and Creating the Next Generation of Marine Industry, the Key to Realizing a Decarbonized Society

    Motohiko MURAI

    The 29th Ocean Engineering Symposium  2022.3  J F O E S & J A S N A O E

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    Event date： 2022.3 - 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

  • Hydroelastic response of a floating airport with damping under severe sea conditions

    Hideki HARUTA, Motohiko MURAI

    The 29th Ocean Engineering Symposium  2022.3  J F O E S & J A S N A O E

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    Event date： 2022.3 - 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

  • A studyon tilt angle control by changing the position of the center of gravity to make a large tilt state assuming a spar type floating wind turbine

    Mitsuki Yamaguchi, Motohiko MURAI

    The 29th Ocean Engineering Symposium  2022.3  J F O E S & J A S N A O E

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    Event date： 2022.3 - 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

  • Influence of internal resistance and thrust coefficient in a linear generator installed on a PA-WEC on power generation

    Shinnosuke KAKIMOTO, Motohiko MURAI

    The 29th Ocean Engineering Symposium  2022.3  J F O E S & J A S N A O E

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    Event date： 2022.3 - 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

  • Verification of Power Generation Variation of Twin-engine Vertical Axis Wind Turbine Considering Interference between Floating Motion and Wind

    Natsumi SATO, Motohiko MURAI

    The 29th Ocean Engineering Symposium  2022.3  J F O E S & J A S N A O E

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    Event date： 2022.3 - 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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Past of Collaboration and Commissioned Research 【 display / non-display 】

  • グリーフロートの開発に関する研究

    Offer organization: 清水建設   Others  

    Project Year： 2016.4  -  2018.3 

  • 受託研究：(株)三井造船　昭島研究所

    Cooperative Research within Japan  

    Project Year： 1999  -   

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

  • 2022   Systems Design for Ocean-Space Literacy 2

    College of Engineering Science

  • 2022   Systems Design for Ocean-Space Literacy 1

    College of Engineering Science

  • 2022   Project Management

    College of Engineering Science

  • 2022   Seminar on Ocean System Design

    College of Engineering Science

  • 2022   Studio of Maritime Frontier Science B

    Graduate school of Engineering Science

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Committee Memberships 【 display / non-display 】

  • 漁港漁場施設の設計手法の高度化検討委員会

    2020.11  委員

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    Committee type：Other 

  • 日本沿岸域学会　理事会

    2019.7  運営委員会担当理事

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    Committee type：Academic society 

  • JASNAOE Marine Environment Committee

    2019.4 

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    Committee type：Academic society 

  • AUV の運用ガイドラインに係る検討会

    2018.9  座長

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    Committee type：Government 

  • ISSC Specialist Committee on Ocean Space Utilization

    2018.9  member

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    Committee type：Academic society 

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

  • Lecture on "Design and Analysis of Offshore floating Wind Turbine" supported by Global Initiative of Academic Network (GIAN)

    Role(s)： Lecturer

    Global Initiative of Academic Network by INDIA Government  Mangaluru, India  2019.9

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    Audience： Graduate students,　Researchers

    Type：Extension Lecture

  • 海洋再生可能エネルギーに関する出前講義

    Role(s)： Lecturer

    横浜市立桜丘高校  2018.10

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    Audience： High school students

    Type：Visiting lecture

  • 映画「アルキメデスの大戦」の数学監修

    Role(s)： Consultant,　Official expert

    東宝  2018.6 - 2019.9

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    Audience： Other

    Type：TV or radio program

    映画「アルキメデスの大戦」に数学監修として参画。主に劇中の数式の創作、船舶図面・用語の検討などに貢献。

  • World NAOE Forum 2013 &International Symposium on Developments in Marine and Offshore Renewable Energy

    2013.11

  • 平成25年　日本船舶海洋工学会　秋季講演会

    大阪  2013.11

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