Researcher basic information

• 博士（情報科学）, 北海道大学情報科学院, Mar. 2021

• https://researchmap.jp/shingo_hiruma?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202101015477814825
• https://orcid.org/0000-0002-9399-5822
• https://sites.google.com/view/shingo-hiruma

• 90909847

• https://orcid.org/0000-0002-9399-5822

• 202101015477814825

• 電磁界解析
• Topology optimization
• Model order reduction
• Finite element method

• Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering), Power engineering

• Bachelor's degree program, School of Engineering
• Master's degree program, Graduate School of Information Science and Technology
• Doctoral (PhD) degree program, Graduate School of Information Science and Technology

Research activity information

• Jun. 2025, Galileo Ferraris' Contest The Advisory Board and the Organizing Committee Award The Novelty Category First position in Academic Teams
  佐藤佑樹;佐々木秀徳;丸尾昭人;比留間真悟
• Dec. 2021, IEEE札幌支部, Encouragement Award
  Model Order Reduction for Linear Time-Invariant System with Symmetric Positive-Definite Matrices: Synthesis of Cauer-Equivalent Circuit
  Shingo Hiruma;Hajime Igarashi
• Mar. 2019, 一般社団法人 精密工学会, 精密工学会北海道支部学生奨励賞
• 2019, 一般社団法人 日本シミュレーション学会, Encouragement Award
• 2018, 一般社団法人 電気学会, 電気学会電子・情報・システム部門大会 奨励賞
• 2018, 一般社団法人 シミュレーション学会, Student Presentation Award
• Mar. 2017, 一般社団法人 電気学会, 電気学会北海道支部賞
• 2017, Compumag2017, The Rita Trowbridge Prize 2017 Commendation as one of the three finalists in the category for the Best Paper presented by a young researcher
• Jan. 2017, 一般社団法人 電気学会, 優秀論文発表A賞

• Effective reluctivity of an insulated magnetic spherical particle excited by an axisymmetric polar magnetic field
  Joonas Vesa; Shingo Hiruma; Timo Tarhasaari; Tetsuji Matsuo
  COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 1, 19, Emerald, 02 Jul. 2026, [Peer-reviewed]
  Scientific journal, Purpose
  
  The purpose of this study is to provide a formula for the homogenized reluctivity of an electrically insulated spherical conductive magnetic particle. The insulated particle is excited by azimuthally symmetric boundary conditions for the magnetic field in the polar direction. Otherwise, the boundary conditions are arbitrary.
  
  Design/methodology/approach
  
  A magnetodynamic formulation of Maxwell’s equations is considered inside the particle. An electrostatic formulation is considered inside the insulation. The homogenized reluctivity is derived using mathematical methods based on analytical solutions of the formulations. The leading principle in the derivation of the homogenized reluctivity is energy consistency.
  
  Findings
  
  The most important finding is the formula for the homogenized reluctivity. Furthermore, considering an orthogonal decomposition of the magnetic flux density in terms of spherical harmonics, it turns out that homogenization only distinguishes the first mode of the flux density, regardless of which modes are excited by the boundary conditions. This result is somewhat expected, but it forces us to lump the energy exchange of the higher modes into the homogenized magnetic field strength. The treatment also exposes some of the mathematical structures required for homogenization.
  
  Originality/value
  
  The formula for the homogenized reluctivity is novel. It admits arbitrary but rotationally symmetric boundary conditions for the magnetic field strength at the outer boundary of the insulation in the polar direction. Industrial applications of the developed methods include powder-like materials such as soft magnetic composites. New perspectives on homogenization are provided.
• Application of A-Input Cauer Ladder Network Method to Model Order Reduction of Induction Motors
  Taro Taniguchi; Shingo Hiruma; Takeshi Mifune; Tetsuji Matsuo
  IEEE Transactions on Magnetics, Jul. 2026, [Peer-reviewed]
  Scientific journal
• Electro-Magnetic Decoupling Preconditioner for Eddy Current Problems With External Circuit Coupling
  S. Hiruma; T. Mifune; T. Matsuo
  IEEE Transactions on Magnetics, Jul. 2026, [Peer-reviewed], [Lead author]
  Scientific journal
• Cauer ladder network representation of eddy-current fields using the partial element equivalent circuit method
  Matteo Emiliani; Luca Di Rienzo; Shingo Hiruma; Isacco Figoni; Carlo de Falco; Tetsuji Matsuo
  COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 1, 13, Emerald, 26 May 2026
  Scientific journal, Purpose
  
  This study aims to extract a reduced order model based on the Cauer ladder network (CLN) method from a partial element equivalent circuit (PEEC) formulation of the eddy current problem in parallel conductors. The obtained equivalent circuit can then be effectively used for time domain simulations.
  
  Design/methodology/approach
  
  The PEEC formulation has been written as a first-order linear dynamic system, and the CLN algorithm has been applied to extract the reduced-order model. The numerical results of the reduced order model have been then compared with the reference results obtained both with the finite element method (FEM) and the PEEC method for a canonical test case of two rectangular conductors.
  
  Findings
  
  The Cauer ladder network representation of the eddy current fields is proved to be accurate enough in frequency and in time domains, provided that a sufficient number of the equivalent circuit stages is considered.
  
  Originality/value
  
  The CLN method has already been applied in the past to FEM for eddy current problems. In this work, the CLN has been applied to the PEEC method for the first time.
• Topology optimization of IPM motors with V-shaped permanent magnets using a grayscale free phase-field-based level set method
  Kosei Onishi; Shingo Hiruma; Takeshi Mifune; Tetsuji Matsuo
  COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 1, 12, Emerald, 13 Apr. 2026, [Peer-reviewed]
  Scientific journal, Purpose
  
  This study aims to optimize the internal structure of an interior permanent magnet synchronous motor (IPMSM) with V-shaped magnets to maximize torque. Specifically, it addresses the issue of grayscale (intermediate density) regions that appear near material interfaces in conventional phase-field-based level set methods. The primary objective is to eliminate these intermediate regions to prevent inaccuracies in finite element analysis and to resolve ambiguities in practical manufacturing.
  
  Design/methodology/approach
  
  The proposed method employs a phase-field-based level set framework combined with a dynamic remeshing technique. Unlike conventional approaches that rely on fixed meshes, the computational mesh is regenerated after each update of the level set function so that the mesh explicitly conforms to material boundaries. The optimization problem is formulated to maximize instantaneous torque, and sensitivity analysis is conducted using the adjoint variable method. In addition, the sensitivity of the optimization algorithm to different initial shapes and interface parameters is systematically investigated.
  
  Findings
  
  The proposed remeshing strategy successfully suppresses the formation of grayscale regions, resulting in optimal structures that are completely free of intermediate density regions and exhibit improved structural clarity and manufacturability. The method also demonstrates low sensitivity to variations in the initial shape, yielding stable optimization results. However, the final geometry and torque performance depend strongly on the appropriate selection of the interface propagation speed and diffusion coefficient. Ultimately, the optimized design achieves a 146.2% increase in torque compared with the initial configuration.
  
  Originality/value
  
  This research provides significant value by addressing the persistent issue of grayscale regions near material interfaces in phase-field-based topology optimization for electric machines. While prior studies typically relied on fixed meshes, this work integrates a dynamic remeshing strategy tailored for IPMSM design to achieve strictly grayscale-free optimal structures. Furthermore, the study contributes original insights by systematically investigating the sensitivity of the optimization algorithm to initial conditions, an aspect that has received limited attention in electromagnetic topology optimization literature.
• The Galileo Ferraris Contest: A Benchmark Initiative for Data-Driven Multi-Physics Modeling of Traction Electric Motors
  Luigi Solimene; Simone Ferrari; Riccardo Torchio; Costanza Anerdi; Fabio Freschi; Luca Giaccone; Gianmarco Lorenti; Francesco Lucchini; Spyridon Mallios; Patrick Lombard; Paolo Di Barba; Arash Ghafoorinejad; Maria Evelina Mognaschi; Dimitrios Loukrezis; Eric Diehl; Eniz Museljic; Aylar Partovizadeh; Manfred Kaltenbacher; Sebastian Schöps; Soo-Hwan Park; Chan-Woo Kim; Ji-Hyeon Lee; Younjae Hwang; Min-Ro Park; Myung-Seop Lim; Sina Toghranegar; Ruth V Sabariego; Geert Deconinck; Hussain Kazmi; Zhi Gong; Zuqi Tang; Abdelkader Benabou; Guillaume Verez; Tohid Sharifi; Ali Jamali-Fard; Deniz Bilgili; Jasmin Jelovica; Paolo Manfredi; Riccardo Trinchero; Amir Akbari; Shahin Mahdiyounrad; David A. Lowther; Siyuan Sun; Toshiaki Koike-Akino; Ye Wang; Tatsuya Yamamoto; Yusuke Sakamoto; Bingnan Wang; Ankit Kumar Singh; Sagnik Dey; Swayambhu Mohanty; Aditya Anil Pulikottil; Asmijit Saha; Ankit Dalal; Yuki Sato; Hidenori Sasaki; Shingo Hiruma; Akito Maruo; Elena Blazhevska Ivanoski; Eymen Ipek; Niels Koester; Shahryar Rahnamayan; Piergiorgio Alotto; Gianmario Pellegrino; Maurizio Repetto
  Institute of Electrical and Electronics Engineers (IEEE), 15 Dec. 2025
• Selection of Spatial Harmonics for Motor Model Order Reduction Using Time-Harmonic Eddy Current Analysis
  Tetsuji Matsuo; Naoki Teranishi; Shingo Hiruma; Takeshi Mifune
  IEEE Transactions on Magnetics, 2025, [Peer-reviewed]
  Scientific journal
• Error Estimation of the Cauer Ladder Network Method for the Time-Domain Analysis and Its Application to a Multiport System
  Miwa Tobita; Stéphane Clénet; Shingo Hiruma; Wei Chen; Tetsuji Matsuo
  IEEE Transactions on Magnetics, 60, 12, Dec. 2024, [Peer-reviewed]
  English, International conference proceedings
• Estimation of Condition Number of Quasi-Static Darwin Model
  Shingo Hiruma; Takeshi Mifune; Tetsuji Matsuo
  IEEE Transactions on Magnetics, 60, 12, Dec. 2024, [Peer-reviewed], [Lead author, Corresponding author]
  English, International conference proceedings
• Topology and parameter optimization of IPM motor considering mechanical strength by stress and connection constraints
  Kou Takenouchi; Shingo Hiruma; Takeshi Mifune; Tetsuji Matsuo
  COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 43, 4, Emerald, 28 Jun. 2024, [Peer-reviewed]
  Scientific journal
• Henrici-Pflüger-Type Error Estimators for the Cauer Ladder Network Representation
  Nagamine, H.; Hiruma, S.; Mifune, T.; Matsuo, T.
  IEEE Transactions on Magnetics, 60, 3, Mar. 2024, [Peer-reviewed]
  Scientific journal
• Advances in High-Frequency Modeling Techniques for Winding Structures,巻線の高周波モデリング技術の新展開
  Hiruma, S.
  Journal of the Institute of Electrical Engineers of Japan, 144, 11, 2024
  Scientific journal
• Homogenization Method Based on Cauer Ladder Network Representation of Unit Cell
  Shingo Hiruma; Yasuhito Takahashi; Tetsuji Matsuo
  IEEE Transactions on Magnetics, 60, 12, 2024, [Peer-reviewed], [Lead author, Corresponding author]
  English, International conference proceedings
• Time-Domain Homogenization of Windings Using B-Input Cauer Ladder Network Method
  Yasuhito Takahashi; Shingo Hiruma; Koji Fujiwara; Satoshi Imamori
  IEEE Transactions on Magnetics, 60, 12, 2024, [Peer-reviewed]
  English, International conference proceedings
• Truncation Error Formula for Multi-Port Cauer Ladder Networks
  Nagamine, H.; Hiruma, S.; Mifune, T.; Matsuo, T.
  IEEE Transactions on Magnetics, 60, 6, 2024, [Peer-reviewed]
  Scientific journal
• Effective Data-driven Method Based on Bayesian Approach for Performance Estimation of Wound-field Motors
  Tie yang Zhao; Yuki Hidaka; Shingo Hiruma; Hiroyuki Kaimori
  IEEJ Journal of Industry Applications, 13, 3, Institute of Electrical Engineers of Japan (IEE Japan), 2024, [Peer-reviewed]
  Scientific journal
• Extended Finite Element Method for Calculation of Eddy Currents at High Frequencies
  Shingo Hiruma
  IEEE Transactions on Magnetics, 59, 5, 1, 4, May 2023, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Error Estimation of the Cauer Ladder Network Method Based on Eigenfunction Expansion
  Hideaki Nagamine; Shingo Hiruma; Takeshi Mifune; Tetsuji Matsuo
  IEEE Transactions on Magnetics, 59, 5, 1, 4, May 2023, [Peer-reviewed]
  Scientific journal
• Time-Domain Homogenized Finite Eddy Current Analysis Using Recursive Convolution Method
  Yuki Sato; Shingo Hiruma; Hajime Igarashi; Hirokazu Matsumoto
  IEEE Transactions on Magnetics, 59, 5, 1, 4, May 2023, [Peer-reviewed]
  English, International conference proceedings
• Port Reduction of Multiport Cauer Ladder Network
  Tetsuji Matsuo; Toshihiro Ozeki; Shingo Hiruma; Takeshi Mifune
  IEEE Transactions on Magnetics, 60, 3, 1, 1, Institute of Electrical and Electronics Engineers (IEEE), 2023, [Peer-reviewed]
  Scientific journal
• Extended Finite Element Method Enhanced by Exact Boundary Representation for Analysis of Eddy Currents
  Shingo Hiruma
  IEEE Transactions on Magnetics, 60, 3, 1, 1, Institute of Electrical and Electronics Engineers (IEEE), 2023, [Peer-reviewed], [Lead author]
  Scientific journal
• Error Estimator for Cauer Ladder Network Representation
  Hiruma, S.; Clenet, S.; Igarashi, H.; Henneron, T.
  IEEE Transactions on Magnetics, 58, 9, 1, 1, Institute of Electrical and Electronics Engineers (IEEE), Sep. 2022, [Peer-reviewed], [Lead author]
  Scientific journal
• Fast Time-Domain Analysis of Darwin Model of Maxwell's Equations Using Arnoldi-Based Model Order Reduction
  Hiruma, S.; Igarashi, H.
  IEEE Transactions on Magnetics, 58, 9, 1, 4, Institute of Electrical and Electronics Engineers (IEEE), Sep. 2022, [Peer-reviewed], [Lead author]
  Scientific journal
• Novel Hybridization of Parameter and Topology Optimizations: Application to Permanent Magnet Motor
  Shingo Hiruma; Makoto Ohtani; Shingo Soma; Yoshihisa Kubota; Hajime Igarashi
  IEEE Transactions on Magnetics, 57, 7, 1, 1, Institute of Electrical and Electronics Engineers (IEEE), 2021, [Peer-reviewed], [Lead author]
  Scientific journal
• Model Order Reduction for Linear Time-Invariant System with Symmetric Positive-Definite Matrices: Synthesis of Cauer-Equivalent Circuit
  Hiruma, S.; Igarashi, H.
  IEEE Transactions on Magnetics, 56, 3, 1, 8, Institute of Electrical and Electronics Engineers (IEEE), Mar. 2020, [Peer-reviewed], [Lead author]
  Scientific journal
• Synthesis of Equivalent Circuit from Homogenized FE Equation using Model Order Reduction
  Shingo Hiruma; Hajime Igarashi
  IEEJ Transactions on Power and Energy, 140, 2, 134, 139, Institute of Electrical Engineers of Japan (IEE Japan), 01 Feb. 2020, [Peer-reviewed], [Lead author]
  English, Scientific journal
• Time-Domain Analysis of Magnetically Shielded Wire Coils Using Homogenized Finite-Element Method
  Fujita, S.; Hiruma, S.; Igarashi, H.
  IEEE Transactions on Magnetics, 56, 2, 1, 4, Institute of Electrical and Electronics Engineers (IEEE), Feb. 2020, [Peer-reviewed]
  Scientific journal
• Homogenization Method Based on Cauer Circuit via Unit Cell Approach
  Hiruma, S.; Igarashi, H.
  IEEE Transactions on Magnetics, 56, 2, 1, 5, Institute of Electrical and Electronics Engineers (IEEE), Feb. 2020, [Peer-reviewed], [Lead author]
  Scientific journal
• Time-domain analysis of homogenized finite-element method for eddy current analysis with reduced unknown variables
  Hiruma, S.; Igarashi, H.
  IEEE Transactions on Magnetics, 56, 1, 1, 4, Institute of Electrical and Electronics Engineers (IEEE), Jan. 2020, [Peer-reviewed], [Lead author]
  Scientific journal
• Fast computation of copper and iron losses using model order reduction
  Shingo Hiruma; Hajime Igarashi
  International Journal of Applied Electromagnetics and Mechanics, 60, S79, S86, IOS Press, 30 May 2019, [Peer-reviewed], [Lead author]
  Scientific journal
• Eddy Current Analysis of Litz Wire Using Homogenization-Based FEM in Conjunction With Integral Equation
  Shingo Hiruma; Yoshitsugu Otomo; Hajime Igarashi
  IEEE Transactions on Magnetics, 54, 3, 1, 4, Mar. 2018, [Peer-reviewed], [Lead author]
  English, Scientific journal
• Fast 3-D Analysis of Eddy Current in Litz Wire Using Integral Equation
  Hiruma, S.; Igarashi, H.
  IEEE Transactions on Magnetics, 53, 6, 1, 4, Institute of Electrical and Electronics Engineers (IEEE), Jun. 2017, [Peer-reviewed], [Lead author]
  Scientific journal

• フルマクスウェル方程式およびダーウィンモデルに対するEMD前処理を用いた反復解法に関する検討—A study on iterative solutions using EMD preconditioning for the full Maxwell equations and Darwin model—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
  比留間 真悟, 電気学会研究会資料. RM / 電気学会回転機研究会 [編], 2026, 1-20, 1, 5, 05 Mar. 2026
  東京 : 電気学会, Japanese
• Equivalent Circuit Modeling of Complex Permeability in MnZn Ferrite with Dimensional Dependence
  比留間真悟, 電気学会産業応用部門大会(CD-ROM), 2025, 2025
• Generation of IPM motor geometry by direct CAD file output using large language models
  宗田昂大; 比留間真悟; 野口聡, 電気学会産業応用部門大会(CD-ROM), 2025, 2025
• A study on preconditioners for solving linear systems of eddy current problems with current and voltage excitations
  比留間真悟; 美舩健; 松尾哲司, 電気学会研究会資料(Web), SA-25-001-029/RM-25-001-029, 2025
• A Study on the Verified Computations to the Cauer Ladder Network Representation of a Square Prism Conductor
  長嶺英朗; 山口忠; 比留間真悟; 美舩健; 松尾哲司; 菅原賢悟, 電気学会研究会資料(Web), SA-25-001-029/RM-25-001-029, 2025
• A Study of Model Order Reduction of Induction Motors Using Magnetic Flux Input Cauer Ladder Network Method
  谷口太郎; 比留間真悟; 美舩健; 松尾哲司, 電気学会研究会資料(Web), SA-25-030-058/RM-25-030-058, 2025
• Two-Step Topology Optimization Using Genetic Algorithms and Local Search Methods Based on Shape Differentiation
  大村遥人; 比留間真悟; 美舩健; 松尾哲司, 電気学会研究会資料(Web), SA-25-084-092.094-102/RM-25-096-104.106-114, 2025
• A Study on the Application of a Phase-Field-Based Level Set Method to Grayscale-Free Topology Optimization of IPM Motors
  大西恒世; 比留間真悟; 美舩健; 松尾哲司, 電気学会研究会資料(Web), SA-25-103-114.116-119/RM-25-115-126.128-131, 2025
• Nonlinear MOR of Induction Motor with Reduced Representation of Airgap Harmonics
  Tetsuji Matsuo; Toshihiro Ozeki; Miwa Tobita; Shingo Hiruma; Takeshi Mifune, 2024 IEEE 21ST BIENNIAL CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION, CEFC 2024, 2024, [Peer-reviewed]
  English
• Parametric Model Order Reduction of Darwin Model Considering Nonlinear Magnetic Materials
  Shingo Hiruma; Yuki Sato; Tetsuji Matsuo, 2024 IEEE 21ST BIENNIAL CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION, CEFC 2024, 2024, [Peer-reviewed]
  English
• Reduced Order Modeling of Rectangular Wires in a Magneto-quasi-static Field for Integral Formulation
  Shingo Hiruma; Luca Di Rienzo; Carlo de Falco, 2024 IEEE 21ST BIENNIAL CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION, CEFC 2024, 2024, [Peer-reviewed]
  English
• A study of estimation of condition number for nearly singular system of equations
  比留間真悟; 美舩健; 松尾哲司, 電気学会研究会資料(Web), SA-24-044-051.053-062/RM-24-082-089.091-100, 2024
• A study of extraction of gap harmonics for model order reduction of induction motor using complex finite element analysis
  寺西直希; 松尾哲司; 美舩健; 比留間真悟, 電気学会研究会資料(Web), SA-24-044-051.053-062/RM-24-082-089.091-100, 2024
• Study on Subspace Preconditioning for applying Algebraic Multigrid Method to Edge Element Electromagnetic Field Analysis
  實松大介; 美舩健; 比留間真悟; 松尾哲司, 電気学会研究会資料(Web), SA-24-044-051.053-062/RM-24-082-089.091-100, 2024
• Preliminary Study of Dynamic Magnetization Modeling of Magnetic Material in High Frequency Range Using Domain Structure Model
  荒谷陸斗; 松尾哲司; 美舩健; 比留間真悟, 電気学会研究会資料(Web), MAG-24-090-106, 2024
• A study of B-input Cauer ladder network method and its application to unit cell-based homogenization method
  比留間真悟; 高橋康人; 松尾哲司, 電気学会研究会資料(Web), SA-24-001-014/RM-24-001-014, 2024
• Henrici-Pfluger型誤差限界を用いたCLN法の精度評価に関する検討—A Study of the Accuracy of the CLN method using Henrici-Pfluger Error Nounds—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
  長嶺 英朗; 比留間 真悟; 美舩 健; 松尾 哲司, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2023, 1-10・12-17, 33, 38, 02 Mar. 2023
  電気学会, Japanese
• 円形導体の表皮・近接効果のための拡張有限要素法を用いた渦電流解析に関する検討—A study of eddy current analysis using extended finite element method—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
  比留間 真悟, 電気学会研究会資料. RM / 電気学会回転機研究会 [編], 2023, 1-10・12-17, 83, 87, 02 Mar. 2023
  電気学会, Japanese, 37162846
• Simplification of Foster Circuits Based on Wasserstein Metric
  長嶺英朗; 比留間真悟; 美舩健; 松尾哲司, 電気学会電子・情報・システム部門大会(Web), 2023, 2023
• Convergence Analysis of the Cauer Ladder Network Method using Eigenfunction Expansion
  H. Nagamine; S. Hiruma; T. Mifune; T. Matsuo, 2022 IEEE 20th Biennial Conference on Electromagnetic Field Computation (CEFC), 1, 2, 24 Oct. 2022, [Peer-reviewed]
  IEEE
• 単層ニューラルネットワークを用いた代替磁束モデル生成におけるd軸磁束の推定精度向上に関する基礎検討—Basic Study on Improvement of d-axis Flux Estimation Accuracy in Alternative Magnetic Flux Model Generated by Neural Network—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
  日高 勇気; 趙 鉄陽; 比留間 真悟; 貝森 弘行; 江川 みち; 松下 嘉子, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2022, 80-100, 25, 30, 30 Sep. 2022
  電気学会, Japanese
• 拡張有限要素法を用いた渦電流解析に関する検討—A study of eddy current analysis using extended finite element method—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
  比留間 真悟, 電気学会研究会資料. RM / 電気学会回転機研究会 [編], 2022, 62-82, 7, 12, 29 Sep. 2022
  電気学会, Japanese
• CLN法のための誤差推定手法の数理的背景に関する考察—A study of mathematical background of an error estimator for CLN method—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
  比留間 真悟; 松尾 哲司, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2022, 1-4・6-17, 41, 45, 07 Mar. 2022
  電気学会, Japanese
• 固有関数展開を用いたCauer Ladder Network法の誤差解析に関する一検討—A Study of Error Bounds for the Cauer Ladder Network Method using Eigenfunction Expansion—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
  長嶺 英朗; 比留間 真悟; 美舩 健; 松尾 哲司, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2022, 1-4・6-17, 35, 40, 07 Mar. 2022
  電気学会, Japanese
• Extended Finite Element Method for Calculation of Eddy Currents at High Frequencies
  Shingo Hiruma, TWENTIETH BIENNIAL IEEE CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION (IEEE CEFC 2022), 2022, [Peer-reviewed]
  English
• Error Estimator for Continued Fraction Approximation of Linear Dynamical System
  Shingo Hiruma; Stephane Clenet; Hajime Igarashi, TWENTIETH BIENNIAL IEEE CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION (IEEE CEFC 2022), 2022, [Peer-reviewed]
  English
• 渦電流と寄生容量を考慮した準定常場解析の基礎検討(その2)—A study on quasi-static electromagnetic field analysis including eddy currents and capacitive effects(2)—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
  比留間 真悟; 五十嵐 一, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2021, 1・3-14, 31, 36, Mar. 2021
  電気学会, Japanese
• A study on model order reduction for Darwin approximation of Maxwell’s equations
  比留間真悟, 電気学会研究会資料(Web), SA-21-048-065/RM-21-069-086, 2021
• Multi-material Topology Optimization of Permanent Magnet Motor with Arbitrary Adjacency Relationship of Materials
  Hayaho Sato; Shingo Hiruma; Hajime Igarashi, CEFC 2020 - Selected Papers from the 19th Biennial IEEE Conference on Electromagnetic Field Computation, 16 Nov. 2020, [Peer-reviewed]
  English
• 渦電流と寄生容量を考慮した準定常場解析の基礎検討—A study on quasi-static electromagnetic field analysis including eddy currents and capacitive effects—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
  比留間 真悟; 五十嵐 一, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2020, 31-50, 93, 102, 03 Sep. 2020
  電気学会, Japanese
• 動的モード関数のStieltjes連分数およびCauer回路表示について (諸科学分野を結ぶ基礎学問としての数値解析学)
  比留間 真悟; 五十嵐 一, 数理解析研究所講究録, 2167, 75, 81, Jul. 2020
  京都大学数理解析研究所, Japanese
• Topology Optimization of PM Motors: representation of different magnetizations
  佐藤駿輔; 比留間真悟; 岡本和也; 五十嵐一, 電気学会全国大会講演論文集(CD-ROM), 2020, 2020
• Cauer circuit representation of leakage impedance of transformer winding using complex permeability
  比留間真悟; 五十嵐一, 電気学会全国大会講演論文集(CD-ROM), 2020, 2020
• Multi-material and multi-objective optimization of IPM motor considering constraints
  林翔吾; 比留間真悟; 五十嵐一, MAGDAコンファレンス講演論文集, 29th (CD-ROM), 2020
• Simulation Methods for Power Inductors : Homogenization and Model Order Reduction
  五十嵐 一; 比留間 真悟; 佐藤 駿輔, まぐね = Magnetics Japan, 15, 3, 173, 178, 2020
  日本応用磁気学会, Japanese
• 均質化有限要素解析による時間領域解析 : コイル巻線渦電流損失解析への適用—Time-domain analysis using homogenization-based finite element method : Application to analysis of eddy current loss in coil winding—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
  比留間 真悟; 五十嵐 一, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2019, 1-15, 25, 30, 05 Mar. 2019
  電気学会, Japanese
• IPMモータの複数材料トポロジー最適化
  佐藤駿輔; 比留間真悟; 五十嵐一, 電気学会電子・情報・システム部門大会講演論文集(CD-ROM), 2019, 2019
• セイシキ カイテンキ ゴウドウ ケンキュウカイ ・ デンジカイ スウチ ケイサン ギジュツ 、 イッパン
  ヒルマ シンゴ; イガラシ ハジメ, 電気学会研究会資料. SA / 電気学会静止器研究会 [編], 2018, 1-15, 73, 80, 23 Jan. 2018
  電気学会, Japanese
• Time-domain analysis using homogenization-based finite element method: Continued fraction representation of complex permeability of unit cell
  比留間真悟; 五十嵐一, 電気学会研究会資料, SA-18-053-059.061-068/RM-18-072-078.080-087, 2018
• 伝達関数のStieltjes連分数展開による電磁機器の等価回路生成
  比留間真悟; 五十嵐一, 電気学会電子・情報・システム部門大会講演論文集(CD-ROM), 2018, 2018
• Synthesis of equivalent circuit of a system including macroscopic permeability
  比留間 真悟; 五十嵐 一, 電気学会研究会資料. RM, 2017, 83, 67, 72, 21 Sep. 2017
  電気学会, Japanese
• Fast three-dimensional analysis of eddy currents in Litz wire using integral equation
  Shingo Hiruma; Hajime Igarashi, IEEE CEFC 2016 - 17th Biennial Conference on Electromagnetic Field Computation, 12 Jan. 2017, [Peer-reviewed]
  English
• 自己随伴Lanczos法を用いた伝達関数の連分数近似
  比留間真悟; 五十嵐一, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2017, 2017
• Integral equation using complex permeability : analysis of fine conductive lines
  比留間 真悟; 藤田 祥伍; 五十嵐 一, 電気学会研究会資料. RM, 2016, 103, 19, 24, 07 Sep. 2016
  電気学会, Japanese

• 巻線の高周波モデリング技術
  比留間 真悟
  パワーエレクトロニクス用磁気的受動部品のための高周波電磁界解析の最近の動向, 14 Mar. 2024
  [Invited]
• ダーウィン近似を用いた電気機器高周波モデリング技術
  比留間 真悟
  電気学会電力・エネルギーフォーラム「電磁界解析の先進応用技術」, 07 Dec. 2023
  [Invited]
• Introducing Extended Finite Element Approaches in Eddy Currents Analysis
  Shingo Hiruma
  ICIAM 2023, 21 Aug. 2023, Oral presentation
  21 Aug. 2023 - 25 Aug. 2023, [Invited]
• Introducing extended finite element approaches in analysis of high-frequency electromagnetic devices
  IEEE札幌セクション講演会, 04 Jun. 2023, Public discourse
  [Invited]
• 均質化における連分数表示の活用
  比留間真悟
  材料科学における幾何と代数III, 04 Sep. 2022, Oral presentation
• FreeFEMで学ぶ数値解析入門
  比留間真悟
  低温工学・超電導学会学生研究交流会, 25 Feb. 2022, Public discourse

• Dec. 2021 - Present
  IEEE
• 2018 - Present
  日本シミュレーション学会
• 2017 - Present
  電気学会
• Present
  International COMPUMAG Society

• 深層学習を用いたモビリティ用高出力密度モータのトポロジー最適化と性能実証
  科学研究費助成事業
  Apr. 2025 - Mar. 2028
  五十嵐 一; 日高勇気; 佐々木秀徳; 比留間真悟; 大友佳嗣; 間藤昂允
  日本学術振興会, 基盤研究(A), 北海道大学;立命館大学;法政大学;長崎大学, Competitive research funding, 25H00723
• トポロジー最適化におけるハイパーパラメタ探索のためのメタ最適化アルゴリズムの開発
  科学研究費助成事業
  Apr. 2024 - Mar. 2028
  比留間 真悟
  日本学術振興会, 若手研究, 京都大学, 24K17261
• パワーエレクトロニクス用受動素子のための磁気特性や共振現象を考慮可能なモデル縮約法の開発
  パワーアカデミー研究助成「萌芽研究」
  Jan. 2024 - Dec. 2025
  比留間 真悟
  パワーアカデミー, Principal investigator, 2023-H20
• Nonlinear reduced-order modeling considering inductive and capacitive effects for high-frequency inductor
  Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
  Apr. 2022 - Mar. 2024
  比留間 真悟
  Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, Kyoto University, 22K14237
• 均質化された電磁機器の低次元モデル生成による高速時間応答解析法の開発
  Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
  Apr. 2019 - Mar. 2022
  比留間 真悟
  2019年7月にParis, Franceで行われた国際学会において、「複素透磁率を用いた均質化法」についての研究と「複素透磁率を用いて均質化された系の時間応答解析法」について研究の2件の発表を行った．複素透磁率を用いた均質化法では従来は難しかった任意形状の導体の複素透磁率の連分数表現を簡潔に求めることが可能になった．これにより従来手法よりも幅広い系に均質化法が適用可能となった．
  また、2019年10月には大規模な係数行列を含む伝達関数の連分数近似を求めるCVL (Cauer via Lanczos）法に関連する論文がアクセプトされた．本論文ではMaxwell方程式から縮約モデルとしてCauer回路を得る手法と伝達関数の有理関数近似を求める手法との関係性を明らかにし，伝達関数を連分数近似する手法を新たに提案した．これにより任意の系の有限要素方程式から低次元モデルとしてCauer回路を得ることが可能になった．
  さらに2020年3月には電気学会全国大会（開催中止）に「均質化された変圧器巻線の拡張等価回路の提案」についての原稿投稿を行った．本手法では従来用いられてきた古典的な変圧器巻線の等価回路を渦電流による損失を考慮することができる形に拡張した．巻線の複素透磁率を用いることにより，古典的渦電流損失推定手法であるDowellの式を高周波数まで精度よく拡張することができる．この拡張された推定式を用いることで変圧器巻線の等価回路を拡張している．
  上記の研究は申請者らが提案する「均質化された電磁機器の低次元モデル生成による高速時間応答解析法」の一環として行われたものである．
  Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Hokkaido University, 19J20541

• 渦電流解析のためのコンピュータ実装方法、システム及びコンピュータプ ログラム
  Patent right, 比留間 真悟; 松尾 哲司; 美舩 健, 国立大学法人京都大学, 株式会社ＪＳＯＬ
  特願PCT/JP2025/ 39655, 12 Nov. 2025
• 渦電流解析のためのコンピュータ実装方法、システム及びコンピュータプ ログラム
  Patent right, 比留間 真悟, 松尾 哲司, 美舩 健
  特願2025-34800, 05 Mar. 2025
• 渦電流解析のためのコンピュータ実装方法、システム及びコンピュータプ ログラム
  Patent right, 比留間 真悟; 松尾 哲司; 美舩 健, 国立大学法人京都大学
  特願2024-199933, 15 Nov. 2024