Personnel Information


Hasegawa Koji

The master's program in charge

Division of Information and Electronic Engineering

The doctoral program in charge

Division of Engineering

The department in charge

Department of Engineering

Job title


E-mail Address

E-mail address

Research field 【 display / non-display

  • Electron device/Electronic equipment

  • Communication/Network engineering

Keywords for Research Field 【 display / non-display

  • electromagnetic waves, ultrasonics

Graduate school・Graduate course, etc. 【 display / non-display

  • Hokkaido University

    1989.03,Doctoral program,Graduate School, Division of Engineering,電子工学専攻,Completed,Japan

Graduate school・major, etc. 【 display / non-display

  • Hokkaido University

    1984,Faculty of Engineering,電子工学科,Graduate

Degree 【 display / non-display

  • Doctor of Engineering


Academic Society 【 display / non-display

  • IEEE

  • Optical society of America

  • the Japan society for computaional emgineering and science

  • Japan Society for Computational Methods in Engineering

  • The Institute of Electronics, Information and Communication Engineers




Purpose of Research



Summary of Research



Research Content

Features / Benefits of Research

1.Point of research 2.Research of novelty
  • ハイブリッド・トレフツ有限要素法の使用
  • 確立した有限要素解析技術の利用により、汎用プリプロセスおよびポストプロセスの利用が可能
  • 電磁波ならびに圧電体中の超音波-のハイブリッド・トレフツ有限要素法の適用により、高速な解析的計算技術と低速だが汎用性の高い数値解析技術の融合を実現
  • 周期構造などのデバイスの特徴に応じた定式化の導入
3.Primacy of Technology 4.Situation of patent-related
  • 波動場解析に特化した有限要素解析法
  • 現在研究段階の有限要素技術との親和性が高く、新規技術を取り込みながら改良が可能

Books 【 display / non-display

  • Koji Hasegawa and Takao Shimada

    InTech,Perfectly Matched Layer for Finite Element Analysis of Elastic Waves in Solids,(p.380),2012.10,978-953-51-0717-0

Papers 【 display / non-display

  • Hybrid Trefftz Finite-Element Method for Analyzing the Eigenmodes of Optical Fibers

    Shingo Sato, Koji Hasegawa, Naoya Mizukami, and Yasuo Tsushima,Journal of Lightwave Technology,vol.37,(3),(p.1029 ~ 1036),2019.02

  • Finding Propagation Constants of Leaky and Degenerate Modes Using Simultaneous Transcendental Equations of Holey Optical Fibers

    Sato Shingo, Hasegawa Koji, Tsushima Yasuo,JOURNAL OF LIGHTWAVE TECHNOLOGY,vol.35,(14),(p.2871 ~ 2879),2017.07

  • Resonant frequency analysis of a Lame-mode resonator on a quartz plate by the finite-difference time-domain method using the staggered grid with the collocated grid points of velocities

    Yasui Takashi, Hasegawa Koji, Hirayama Koichi,JAPANESE JOURNAL OF APPLIED PHYSICS,vol.55,(7),Article Number:07KC02,2016.07

  • Efficient finite-difference time-domain computation of resonant frequencies of rectangular Lamé mode resonators via a combination of the symmetry boundary conditions and the Padé approximation

    Takashi Yasui, Koji Hasegawa, and Koichi Hirayama,Japanese Journal of Applied Physics,vol.54,(7),(p.07HD01-1 07HD04-6 ~ ),2015.06

  • Extraction of all propagation constants in a specified region from the transcendental equation of a dispersion relation using the Sakurai–Sugiura projection method

    Shingo Sato, Takao Shimada, and Koji Hasegawa,Journal of the Optical Society of America A,vol.32,(7),(p.1216 ~ 1221),2015.06

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International conference proceedings 【 display / non-display

  • A comparison of the free-surface boundary conditions in the FD-TD method for elastic wave propagation analysis

    T.Yasui, K.Hasegawa, and K.Hirayama,Proceedings of Symposium on Ultrasonics Electronics,2013.11,Kyoto

  • Perfectly Matched Layers of Elastic Wave Propagation in a Piezoelectric Solid in the Frequency Domain

    K. Hasegawa and S. Sato,proceedings of Symposium on Ultrasonic Electronics,vol.33,2012.11,Chiba

  • Numerical Dispersion of Elastic Wave Propagation in Finite Difference Time Domain Analysis

    T. Shimada, K.Hasegawa and S. Sato,Proceedings of Symposium on Ultrasonic Electronics,vol.33,2012.11,Chiba

  • An Analysis of Lamé Mode Resonators by Finite DifferenceTime Domain Method

    T. Yasui, K.Hasegawa and K.Hirayama,proceedings of Symposium on Ultrasonic Electronics,vol.33,2012.11,Chiba

  • Grids in the finite difference time domain method for elastic waves in solids

    K.Hasegawa and T.Shimada,The Proceedings of Symposiumn on Ultrasonic Electronics,vol.32,(p.205 ~ 206),2011.11,kyoto

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Research reports 【 display / non-display

  • Hybrid Trefftz Finite Element Method Using Sakurai-Sugiura Projection Method for Electromagnetic Waveguide Eigenvalue Problems


  • 異方性弾性体の完全整合層に関する考察

    長谷川,嶋田,電子情報通信学会技術報告,vol.IEICE-US2009-50.,(213),(p.71 ~ 76),2009

  • 周期構造による平面波散乱特性のハイブリッドトレフツ有限要素法解析の拡張


  • 3次元2重周期構造による平面波散乱特性のハイブリッドトレフツ有限要素法解析


Presentaion at conference, meeting, etc. 【 display / non-display

  • Extraction of all eigenmodes propagating in an optical fiber from transcendental equations by the Sakurai-Sugiura method

    J.Takahashi, S.Sato, and K.Hasegawa,PIERS2017 Singerpore,Proceedings of PIERS2017 Singerpore ,2017.11.19,Singerpore,Singerpore

  • Computation of differential mode group delay in a few mode optical fiber from transendental equations by the automatic differentiation and the Sakurai-Sugiura method

    N.Mizukami, S.Sato, and K.Hasegawa,Proceedings of PIERS 2017 Singerpore,2017.11.19,Singerpore,Singerpore

  • A Trefftz method formultion for eigenmode analysis of cyrindrical optical fibers

    S.Sato, and K.Hasegawa,Proceedings of PIERS2017 St Petersburg,2017.05.22,Russia

  • An analysis of eigenmodes propagating on a holey fiber with the multipole method and the Sakurai-Sugiura method

    Y.Tsushima, S.Sato, and K.Hasegawa,Proceedings of PIERS2017 St Petersburg,2017.05.22,St Petersburg,Russia

  • 電磁波導波路の対称あるいは反対称固有モードのハイブリッドトレフツ有限要素解析


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Class subject in charge 【 display / non-display

  • 技術者倫理(電気電子工学コース・情報通信システム工学コース)


  • 電気回路Ⅰ


  • 無線伝送工学


  • 情報符号理論


  • 計算機工学Ⅰ


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Education book 【 display / non-display

  • 基礎からの電磁波工学

    2008,伊藤繁雄,岩崎久雄,岡田敏美,長谷川弘治,第3章 異なる媒質の境界面での反射と透過, (p.197),日新出版