Academic Center for Computing and Media Studies, Kyoto University

Associate Professor

- Linear iterative solvers
- Parallel processing
- Electromagnetic field problem
- High performance computing

- Takeshi Iwashita, Hiroshi Nakashima, and Yasuhito Takahashi, ``Algebraic block multi-color ordering method for parallel multi-threaded sparse triangular solver in ICCG method", Proceedings of 26th IEEE International Parallel and Distributed Processing Symposium (IPDPS 2012), (21-25 May, 2012), Shanghai, China.
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- Yasuhito Takahashi, Takeshi Iwashita, Hiroshi Nakashima, Tadashi Tokumasu, Masafumi Fujita, Shinji Wakao, Koji Fujiwara and Yoshiyuki Ishihara, "Parallel Time-Periodic Finite-Element Method for Steady-State Analysis of Rotating Machines," IEEE Trans. Magn., Vol. 48, No. 2, (2012), pp. 1019-1022.[paper]

- Yasuhito Takahashi, Takeshi Iwashita, Hiroshi Nakashima, Shinji Wakao, Koji Fujiwara and Yoshiyuki Ishihara, ``Micromagnetic Simulations of Perpendicular Recording Head Using the Parallel Fast Multipole Method Specialized for Uniform Brick Elements," IEEE Trans. Magn., Vol. 47, No. 10, (2011), pp. 3805-3808.[paper]

- Y. Takahashi, H. Kaimori, A. Kameari, T. Tokumasu, M. Fujita, S. Wakao, T. Iwashita, K. Fujiwara and Y. Ishihara, ``Convergence Acceleration in Steady State Analysis of Synchronous Machines Using Time-Periodic Explicit Error Correction Method," IEEE Trans. Magn., Vol. 47, No. 5, (2011), pp. 1422-1425.[paper]

- Yasuhito Takahashi, Takeshi Mifune, Takeshi Iwashita, Koji Fujiwara and Yoshiyuki Ishihara, ``Folded IC Preconditioning in Quasi-Static Field Analysis Taking Account of Both Tree-Cotree and phi=0 Gauge Conditions," IEEE Trans. Magn., Vol. 47, No. 5, (2011), pp. 1342-1345.[paper]

- Yasuhito Takahashi, Takeshi Iwashita, Hiroshi Nakashima, Shinji Wakao, Koji Fujiwara and Yoshiyuki Ishihara, ``Performance Evaluation of a Parallel Fast Multipole Accelerated Boundary Integral Equation Method in Electrostatic Field Analysis," IEEE Trans. Magn., Vol. 47, No. 5, (2011), pp. 1174-1177.[paper]

- Y. Takahashi, T. Tokumasu, A. Kameari, H. Kaimori, M. Fujita, T. Iwashita, and S. Wakao, "Convergence Acceleration of Time-Periodic Electromagnetic Field Analysis by Singularity Decomposition-Explicit Error Correction Method," IEEE Trans. Magn., Vol. 46, No. 8, (2010), pp. 2947-2950. [paper]

- T. Mifune, Y. Takahashi, and T. Iwashita, "New Preconditioning Technique to Avoid Convergence Deterioration due to the Zero-Tree Gauge Condition in Magnetostatic Analysis," IEEE Trans. Magn., Vol. 46, No. 7, (2010), pp. 2579-2584. [paper]

- Takeshi Mifune, Yasuhito Takahashi and Takeshi Iwashita, "Folded Preconditioner: a New Class of Preconditioners for Krylov Subspace Methods to Solve Redundancy-Reduced Linear Systems of Equations", IEEE Transactions on Magnetics, Vol. 45, No. 5, (2009), pp. 2068-2075. [paper]

- Takeshi Iwashita, Takeshi Mifune, Soichi Moriguchi and Masaaki Shimasaki, "Physical Meaning of the Advantage of A-phi Method in Convergence", IEEE Transaction on Magnetics, Vol. 45, No. 3, (2009), pp. 1424-1427. [paper]

- Takeshi Mifune, Soichi Moriguchi, Takeshi Iwashita and Masaaki Shimasaki, "Convergence Acceleration of Iterative Solvers for the Finite Element Analysis Using the Implicit and Explicit Error Correction Methods", IEEE Transaction on Magnetics, Vol. 45, No. 3, (2009), pp. 1104-1107. [paper]

- Yasuhito Takahashi, Shinji Wakao, Takeshi Iwashita and Masanori Kanazawa, "Micromagnetic Simulation by Using the Fast Multipole Method Specialized for Uniform Brick Elements", Journal of Applied Physics, Vol. 105, 07D514 (2009).

- Takeshi Iwashita, Takeshi Mifune and Masaaki Shimasaki, "Similarities Between Implicit Correction Multigrid Method and A-phi Formulation in Electromagnetic Field Analysis", IEEE Transaction on Magnetics, Vol. 44, No. 6, (2008), pp. 946-949. [paper]

- Takeshi Iwashita, Junwei Lu and Masaaki Shimasaki, "Parallel ICCG Solvers for a Finite-Element Eddy-Current Analysis on Heterogeneous Parallel Computation Environment", Applied Computational Electromagnetics Society Journal, Vol. 22, No. 2, (2007), pp. 195-200.

- Takeshi Mifune, Takeshi Iwashita and Masaaki Shimasaki, "A Novel Algebraic Multigrid Preconditioning for Large-Scale Edge-Element Analyses", IEEE Transaction on Magnetics, Vol. 43, No. 4, (2007), pp. 1481-1484. [paper]

- Takeshi Iwashita, Takeshi Mifune and Masaaki Shimasaki, "Evaluation Index of Acceleration Factor and Ordering in Shifted ICCG Method for Electromagnetic Field Analyses", IEEE Transaction on Magnetics, Vol. 43, No. 4, (2007), pp. 1493-1496.

- Takeshi Iwashita, Kuniaki Yosui, Michiya Mori, Eiichi Kobayashi and Shin Abe, "Preconditioned Iterative Solver on the Coarsest Level of a Multi-grid Method for High Frequency Time Harmonic Electromagnetic Field Analyses", Computing and Visualization in Science, Vol. 11, No. 3, (2008), pp. 123-128.

- Takao Shimayoshi, Kazuhiro Komurasaki, Akira Amano, Takeshi Iwashita, Tetsuya Matsuda, Masanori Kanazawa, "A Method to Support Cell Physiological Modelling Using Description Language and Ontology", IPSJ Transactions on Bioinformatics, Vol. 47, No. SIG17(TBIO1), (2006), pp. 83-92.

- Takeshi Mifune, Satoshi Isozaki, Takeshi Iwashita and Masaaki Shimasaki, "Algebraic Multigrid Preconditioning for 3-D Magnetic Finite-Element Analyses Using Nodal Elements and Edge Elements", IEEE Transaction on Magnetics, Vol. 42, No. 4, (2006), pp. 635-638.

- Takeshi Mifune, Takeshi Iwashita and Masaaki Shimasaki, "A Parallel Algebraic Multigrid Solver for Fast Magnetic Edge-Element Analyses", IEEE Transaction on Magnetics, Vol. 41-5, (2005), pp. 1660-1663.

- Takeshi Iwashita, Yuuichi Nakanishi and Masaaki Shimasaki, "Comparison Criteria for Parallel Orderings in ILU Preconditioning", SIAM Journal on Scientific Computing, Vol. 26, No. 4, (2005), pp. 1234-1260. [paper]

- Jorji Nonaka, Nobuyuki Kukimoto, Yasuo Ebara, Takeshi Iwashita, Masanori Kanazawa and Koji Koyamada, "Volume Rendering Acceleration by using Object Boundary Projection and Parallel Processing", Journal of IIEEJCVol. 34CNo.3, (2005), pp. 245-255.

- Jorji Nonaka, Nobuyuki Kukimoto, Yasuo Ebara, Masato Ogata, Takeshi Iwashita, Masanori Kanazawa and Koji Koyamada, "Hybrid Image Composition Mechanism for Enhancing Volume Graphics Cluster", IEICE Transactions on Information and Systems, Vol. E88-D, No.11, (2005), pp. 2582-2590.

- Takeshi Iwashita and Masaaki Shimasaki, "Algebraic Block Red-Black Ordering Method for Parallelized ICCG Solver With Fast Convergence and Low Communication Costs", IEEE Transaction on Magnetics, Vol. 39-3, (2003), pp. 1713-1716.

- Takeshi Mifune, Takeshi Iwashita and Masaaki Shimasaki, "New Algebraic Multigrid Preconditioning for Iterative Solvers in Electromagnetic Finite Edge-Element Analyses", IEEE Transaction on Magnetics, Vol. 39-3, (2003), pp. 1677-1680.

- Takeshi Mifune, Takeshi Iwashita and Masaaki Shimasaki, "Algebraic Multigrid Method for Nonsymmetric Matrices Arising in Electromagnetic Finite-Element Analyses", IEEE Transaction on Magnetics, Vol. 39-3, (2003), pp. 1670-1673.

- Takeshi Iwashita and Masaaki Shimasaki, "Block Red-Black Ordering: A New Ordering Strategy for Parallelization of ICCG Method", International Journal of Parallel Programming, Vol. 31, No. 1, (2003), pp. 55-75. [paper]

- Masaaki Shimasaki, Takeshi Iwashita and Takeshi Mifune, "Fast Linear Equation Solvers in High Performance Electromagnetic Field Analysis", Journal of Computational and Applied Mathematics, Vol. 149, (2002), pp. 341-349.

- Takeshi Mifune, Takeshi Iwashita and Masaaki Shimasaki, "A Fast Solver for FEM Analyses Using the Parallelized Algebraic Multigrid Method", IEEE Transaction on Magnetics, Vol. 38-2, (2002), pp. 369-372.

- Takeshi Iwashita and Masaaki Shimasaki, "Algebraic Multi-Color Ordering for Parallelized ICCG Solver in Finite Element Analyses", IEEE Transaction on Magnetics, Vol. 38-2, (2002), pp. 429-432. [paper]

- Takeshi Iwashita and Masaaki Shimasaki, "Construction and Ordering of Edge Elements for Parallel Computation", IEEE Transaction on Magnetics, Vol. 37-5, (2001), pp. 3498-3502. [paper]

- Takeshi Iwashita and Masaaki Shimasaki, "Parallel Processing of 3-D Eddy Current Analysis with Moving Conductor Using Parallelized ICCG solver with Renumbering Process", IEEE Transaction on Magnetics, Vol. 36-4, (2000), pp. 1504-1509. [paper]

- Motoo Ishikawa, Takeshi Iwashita, and Jianzhong Tong, "Performance Analysis of Coal-Fired MHD Faraday Channel at IEE, China", Energy Conversion and Management, Vol.38, No.5 (1997) pp. 499-510.

Takeshi Iwashita