NISHIHARA Kei

Affiliation

Organization for the Promotion of Education

Job Title

Specially Appointed Assistant Professor

Research Fields, Keywords

Optimization, Evolutionary Computation (Evolutionary Algorithm), Machine Learning

Related SDGs




 https://orcid.org/0009-0006-2610-9276

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Education 【 display / non-display 】

  • 2022.4
    -
    2025.3

    Yokohama National University   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Doctor Course   Completed

  • 2020.4
    -
    2022.3

    Yokohama National University   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Master Course   Completed

  • 2016.4
    -
    2020.3

    Yokohama National University   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Graduated

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Degree 【 display / non-display 】

  • Doctor of Engineering - Yokohama National University

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Campus Career 【 display / non-display 】

  • 2026.4
    　
    　

    Duty   Yokohama National UniversityOrganization for the Promotion of Education   Specially Appointed Assistant Professor  

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External Career 【 display / non-display 】

  • 2025.4
    -
    2026.3

    Muroran Institute of Technology   Graduate School of Engineering   Assistant Professor  

  • 2023.10
    -
    2024.3

    Westlake University   Trustworthy & General Artificial Intelligence Laboratory   Researcher  

  • 2022.4
    -
    2025.3

    JSPS Research Fellow   DC1   Special researcher of the Japan Society for the Promotion of Science  

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Research Areas 【 display / non-display 】

  • Informatics / Intelligent informatics

  • Informatics / Soft computing

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Qualification acquired 【 display / non-display 】

  • Usual Car License (first kind)

  • Applied Information Technology Engineer

  • Fundamental Information Engineer/Information Processing Engineer, Class 2

  • Electrical Work Person (second kind)

  • Electric Works Specialist (third kind)

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Thesis for a degree 【 display / non-display 】

  • Adaptations of parameter configurations of evolutionary algorithms for expensive optimization problems

    Kei Nishihara

    Yokohama National University   2025.3

    Doctoral Thesis   Single Work    [Reviewed]

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Papers 【 display / non-display 】

  • An Easy-to-Use Extension of Surrogate-Assisted Multi-Objective Evolutionary Algorithms for Expensive Robust Optimization

    Takuro Tanaka, Yuma Horaguchi, Yuma Yamaguchi, Kei Nishihara, and Masaya Nakata

    International Conference on Parallel Problem Solving from Nature (PPSN)   2026.8  [Reviewed]

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    Language：English   Publishing type：Research paper (international conference proceedings)   Joint Work  

  • Adaptive Switching between Search and Model Refinement via Explainable Machine Learning in Surrogate-assisted Evolutionary Algorithms

    Kei Nishihara, Takahiro Sato, Kazuhiro Izui, and Shinya Watanabe

    IEEE Congress on Evolutionary Computation (CEC)   2026.6  [Reviewed]

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Joint Work  

  • A Simultaneous Topology Optimization Method of Magnet and Iron-core for Interior Permanent Magnet Synchronous Motors Based on Rectangular Shape Correction

    Yuju Sasabuchi, Takahiro Sato, Shinya Watanabe, Kei Nishihara, and Kazuhiro Izui

    IEEE Access   2026  [Reviewed]

    DOI

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

  • Sustainable Performance Improvement of Surrogate-assisted Evolutionary Algorithms using Tabu Search

    Kei Nishihara, Masaya Nakata, and Shinya Watanabe

    International Conference on Evolutionary Computation Theory and Applications (ECTA) in International Joint Congress on Computational Intelligence (IJCCI)   386 - 404   2025.10  [Reviewed]

    DOI

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Single Work  

    Other Link： https://link.springer.com/chapter/10.1007/978-3-032-15635-8_24

  • A surrogate-assisted memetic algorithm for permutation-based combinatorial optimization problems

    Takashi Ikeguchi, Kei Nishihara, Yo Kawauchi, Yuji Kogma, and Masaya Nakata

    Swarm and Evolutionary Computation   98   102060   2025.7  [Reviewed]

    DOI Web of Science

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

    Other Link： https://www.sciencedirect.com/science/article/pii/S2210650225002184

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Review Papers 【 display / non-display 】

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Awards 【 display / non-display 】

  • CEC 2025 Numerical Global Optimization Competition on GNBG-II generated Test Suite, Third Prize

    2025.6   IEEE  

    Individual or group name of awards：Kei Nishihara

  • 特別研究員（DC）の採用最終年次における研究奨励金特別手当の支給

    2024.7   日本学術振興会  

    Individual or group name of awards：西原慧

  • プレゼンテーション賞

    2022.12   進化計算学会  

    Individual or group name of awards：西原慧

  • Young Researcher Award

    2022.12   IEEE Computational Intelligence Society Japan Chapter  

    Individual or group name of awards：Kei Nishihara

  • 特に優れた業績による返還免除制度 全額免除

    2022.6   日本学生支援機構  

    Individual or group name of awards：西原慧

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

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Presentations 【 display / non-display 】

  • 磁石モータの磁石コア同時トポロジー最適化における磁石形状補正法に関する一考察

    上家優弥，笹渕佑樹，佐藤孝洋，西原慧，渡邉真也，泉井一浩

    令和8年電気学会全国大会  2026.3  電気学会

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：仙台市   Country：Japan  

  • 非対称構造を持つIPMSMにおけるトポロジー最適化とトルク発生メカニズムの分析

    笹渕佑樹，佐藤孝洋，西原慧，渡邉真也，泉井一浩

    電気学会 静止器/回転機 合同研究会「電磁界数値計算技術とその応用」  2026.3  電気学会

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：川越市   Country：Japan  

  • 位相変化戦略を組み込んだ順位モデルベースのトポロジー最適化

    髙橋征也，西原慧，佐藤孝洋，泉井一浩，渡邉真也

    進化計算シンポジウム2025  2025.12  進化計算学会

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    Event date： 2025.12

    Language：Japanese   Presentation type：Poster presentation  

    Venue：射水市   Country：Japan  

  • 局所探索型ベイズ最適化における大域サロゲートに基づく有望領域特定

    郷州朔矢，西原慧，佐藤孝洋，渡邉真也

    進化計算シンポジウム2025  2025.12  進化計算学会

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    Event date： 2025.12

    Language：Japanese   Presentation type：Poster presentation  

    Venue：射水市   Country：Japan  

  • 解と評価値の相関に基づく指向性サンプリングによる多目的ベイズ最適化の性能向上

    石坂陸，西原慧，佐藤孝洋，渡邉真也

    進化計算シンポジウム2025  2025.12  進化計算学会

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    Event date： 2025.12

    Language：Japanese   Presentation type：Poster presentation  

    Venue：射水市   Country：Japan  

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

  • 2026   プログラミング基礎

    College of Engineering Science  Department of Mathematics, Physics, Electrical Engineering and Computer Science  Electrical and Computer Engineering Program

  • 2026   電子情報工学実験

    College of Engineering Science  Department of Mathematics, Physics, Electrical Engineering and Computer Science  Electrical and Computer Engineering Program

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

  • 情報学ゼミナール

    2025.10 - 2026.3 Institution：室蘭工業大学

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    Level：Undergraduate (specialized) 

  • 情報学基礎演習A

    2025.10 - 2026.3 Institution：室蘭工業大学

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    Level：Undergraduate (specialized) 

  • 情報学PBL演習

    2025.10 - 2026.3 Institution：室蘭工業大学

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    Level：Undergraduate (specialized) 

  • 基盤情報学演習

    2025.4 - 2025.9 Institution：室蘭工業大学

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    Level：Undergraduate (specialized) 

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