Kohei Fujita (藤田 航平)

Computational Science and High Performance Computing Laboratory
Earthquake Research Institute
The University of Tokyo

Last update: 2021-2-10
Research Map (Japanese)
Research Map (English)

Affiliation

  • Associate Professor, Earthquake Research Institute, The University of Tokyo
  • Associate Professor, Department of Civil Engineering, The University of Tokyo

Contact

  • Address
    Earthquake Research Institute, The University of Tokyo
    Yayoi 1-1-1, Bunkyo, Tokyo 113-0032, Japan
  • E-mail
    fujita@eri.u-tokyo.ac.jp
  • Phone
    81-3-5841-1763
  • Office
    Room T44, Building No. 3 of Earthquake Research Institute

Brief History

(Education)

  • Dr. (Eng.), Civil Engineering, University of Tokyo, 2014
  • M. E., Civil Engineering, University of Tokyo, 2012
  • B. E., Civil Engineering, University of Tokyo, 2010

(Employment)

  • Associate Professor, Earthquake Research Institute (Dept. of Civil Eng.), University of Tokyo, 2021-Present
  • Assistant Professor, Earthquake Research Institute (Dept. of Civil Eng.), University of Tokyo, 2017-2021
  • Visiting Scientist, Advanced Institute for Computational Science, RIKEN, 2017-Present
  • Postdoctoral Researcher, Advanced Institute for Computational Science, RIKEN, 2015-2017
  • Visiting Researcher (Postdoctoral Research Fellow of JSPS), Advanced Institute for Computational Science, RIKEN, 2014-2015

(Prize)

  • 2020.4 The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology. Awards for Science and Technology (Research Category) (Tsuyoshi Ichimura, Muneo Hori, Kohei Fujita)
  • 2018.1 Best Paper Award (HPC Asia 2018; Kohei Fujita, Keisuke Katsushima, Tsuyoshi Ichimura, Masashi Horikoshi, Kengo Nakajima, Muneo Hori, Lalith Maddegedara)
  • 2017.12 Excellent Researcher (東京大学卓越研究員; The University of Tokyo)
  • 2017.11 Best Paper Award (Fourth Workshop on Accelerator Programming Using Directives; Takuma Yamaguchi, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Maddegedara Lalith and Kengo Nakajima)
  • 2017.11 Best Poster Award (SC17: International Conference for High Performance Computing, Networking, Storage and Analysis; Tsuyoshi Ichimura, Kohei Fujita, Takuma Yamaguchi, Muneo Hori, Maddegedara Lalith and Naonori Ueda)
  • 2016.11 Best Paper Award (Third Workshop on Accelerator Programming Using Directives; Kohei Fujita, Takuma Yamaguchi, Tsuyoshi Ichimura, Muneo Hori, Lalith Maddegedara)
  • 2016.11 Best Poster Award (SC16: International Conference for High Performance Computing, Networking, Storage and Analysis; Kohei Fujita, Tsuyoshi Ichimura, Kentaro Koyama, Masashi Horikoshi, Hikaru Inoue, Larry Meadows, Seizo Tanaka, Muneo Hori, Maddegedara Lalith and Takane Hori)
  • 2016.3 The 7th Research Incentive Award (RIKEN)
  • 2014.3 Dean of School of Engineering Award (University of Tokyo)

Refereed Publications (2013-)

  1. Sota Murakami, Tsuyoshi Ichimura, Kohei Fujita, Takane Hori, Yusaku Ohta, Sensitivity analysis for seafloor geodetic constraints on coseismic slip and interseismic slip-deficit distributions, Front. Earth Sci., 2021, doi: 10.3389/feart.2021.614088.
  2. Kohei Fujita, Kentaro Koyama, Kazuo Minami, Hikaru Inoue, Seiya Nishizawa, Miwako Tsuji, Tatsuo Nishiki, Tsuyoshi Ichimura, Muneo Hori, Lalith Maddegedara, High-fidelity nonlinear low-order unstructured implicit finite-element seismic simulation of important structures by accelerated element-by-element method, Journal of Computational Science, 2020, https://doi.org/10.1016/j.jocs.2020.1012.
  3. Takane Hori, Ryoichiro Agata, Tsuyoshi Ichimura, Kohei Fujita, Takuma Yamaguchi, Takeshi Iinuma, High-fidelity elastic Green’s functions for subduction zone models consistent with the global standard geodetic reference system, Earth Planets Space, 2021, https://doi.org/10.1186/s40623-021-01370-y.
  4. Ryota Kusakabe, Kohei Fujita, Tsuyoshi Ichimura, Takuma Yamaguchi, Muneo Hori, Lalith Wijerathne, Development of regional simulation of seismic ground‐motion and induced liquefaction enhanced by GPU computing, Earthquake Engineering & Structural Dynamics, 2020, https://doi.org/10.1002/eqe.3369.
  5. Tsuyoshi Ichimura, Kohei Fujita, Muneo Hori, Lalith Maddegedara, Naonori Ueda, Yuma Kikuchi, A Fast Scalable Iterative Implicit Solver with Green's function-based Neural Networks, ScalA20: 11th Workshop on Latest Advances in Scalable Algorithms for Large-Scale Systems, 2020.
  6. Kohei Fujita, Masashi Horikoshi, Tsuyoshi Ichimura, Larry Meadows, Kengo Nakajima, Muneo Hori, Lalith Maddegedara, Development of element-by-element kernel algorithms in unstructured finite-element solvers for many-core wide-SIMD CPUs: Application to earthquake simulation, Journal of Computational Science, Volume 45, 2020, 101174, ISSN 1877-7503, https://doi.org/10.1016/j.jocs.2020.101174
  7. Tsuyoshi Ichimura, Kohei Fujita, Takuma Yamaguchi, Muneo Hori, Lalith Wijerathne, and Naonori Ueda. 2020. Fast Multi-Step Optimization with Deep Learning for Data-Centric Supercomputing. In Proceedings of the 2020 4th International Conference on High Performance Compilation, Computing and Communications (HP3C 2020). Association for Computing Machinery, New York, NY, USA, 7-13. DOI:https://doi.org/10.1145/3407947.3407949
  8. Takuma Yamaguchi, Kohei Fujita, Tsuyoshi Ichimura, Akira Naruse, Jack C. Wells, Christopher J. Zimmer, Tjerk P. Straatsma, Muneo Hori, Lalith Maddegedara, and Naonori Ueda. 2020. Low-Order Finite Element Solver with Small Matrix-Matrix Multiplication Accelerated by AI-Specific Hardware for Crustal Deformation Computation. In Proceedings of the Platform for Advanced Scientific Computing Conference (PASC'20). Association for Computing Machinery, New York, NY, USA, Article 16, 1-11. DOI:https://doi.org/10.1145/3394277.3401860
  9. Yamaguchi T., Ichimura T., Fujita K., Hori M., Wijerathne L., Ueda N. (2020) Data-Driven Approach to Inversion Analysis of Three-Dimensional Inner Soil Structure via Wave Propagation Analysis. In: Krzhizhanovskaya V. et al. (eds) Computational Science - ICCS 2020. ICCS 2020. Lecture Notes in Computer Science, vol 12139. Springer, Cham.
  10. Murakami S., Yamaguchi T., Fujita K., Ichimura T., Lalith M., Hori M. (2020) Data Assimilation in Volcano Deformation Using Fast Finite Element Analysis with High Fidelity Model. In: Krzhizhanovskaya V. et al. (eds) Computational Science - ICCS 2020. ICCS 2020. Lecture Notes in Computer Science, vol 12139. Springer, Cham.
  11. Ryuichi Sakamoto, Masaaki Kondo, Kohei Fujita, Tsuyoshi Ichimura, Kengo Nakajima, The Effectiveness of Low-Precision Floating Arithmetic on Numerical Codes: A Case Study on Power Consumption, Proceedings of HPC Asia 2020, Jan. 2020, pp. 199-206, DOI: 10.1145/3368474.3368492
  12. Mitsumasa WADA, Shiori KUBO, Hidenori YOSHIDA, Kohei FUJITA, Tsuyoshi ICHIMURA, FAILURE JUDGMENT OF RESERVOIR BODY BASED ON SEISMIC RESPONSE ANALYSIS AND FLOODED ANALYSIS ACCOMPANYING DESTRUCTION, Journal of Applied Mechanics Vol.22 (Special Feature) , 2019 Volume 75 Issue 2 Pages I_155-I_164, https://doi.org/10.2208/jscejam.75.2_I_155.
  13. Takuma Yamaguchi, Tsuyoshi Ichimura, Kohei Fujita, Aitaro Kato, Shigeki Nakagawa, Matched Filtering Accelerated by Tensor Cores on Volta GPUs with Improved Accuracy using Half Precision Variables, IEEE Signal Processing Letters, 2019, pp. 1857-1861, DOI: 10.1109/LSP.2019.2951305.
  14. Yamaguchi T., Fujita K., Ichimura T., Naruse A., Lalith M., Hori M. (2020) GPU Implementation of a Sophisticated Implicit Low-Order Finite Element Solver with FP21-32-64 Computation Using OpenACC. In: Wienke S., Bhalachandra S. (eds) Accelerator Programming Using Directives. WACCPD 2019. Lecture Notes in Computer Science, vol 12017. Springer, Cham.
  15. Kohei Fujita, Masashi Horikoshi, Tsuyoshi Ichimura, Larry Meadows, Kengo Nakajima, Muneo Hori, Lalith Maddegedara, Development of Element-by-Element Kernel Algorithms in Unstructured Implicit Low-Order Finite-Element Earthquake Simulation for Many-Core Wide-SIMD CPUs, Computational Science - ICCS 2019, Lecture Notes in Computer Science, vol 11536, 2019.
  16. Ryota Kusakabe, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Lalith Wijerathne, A Fast 3D Finite-element Solver for Large-scale Seismic Soil Liquefaction Analysis, Computational Science - ICCS 2019, Lecture Notes in Computer Science, vol 11537, 2019.
  17. Takuma Yamaguchi, Tsuyoshi Ichimura, Kohei Fujita, Muneo Hori and Lalith Wijerathne, Heuristic Optimization with CPU-GPU Heterogeneous Wave Computing for Enhancing Three-dimensional Inner Structure, Computational Science - ICCS 2019, Lecture Notes in Computer Science, vol 11537, 2019.
  18. Ryota Kusakabe, Tsuyoshi Ichimura, Kohei Fujita, Muneo Hori, Lalith Wijerathne, A finite element analysis method for simulating seismic soil liquefaction based on a large-scale 3D soil structure model, Soil Dynamics and Earthquake Engineering, Volume 123, 2019.
  19. Ryoichiro Agata, Sylvain D. Barbot, Kohei Fujita, Mamoru Hyodo, Takeshi Iinuma, Ryoko Nakata, Tsuyoshi Ichimura, Takane Hori, Rapid mantle flow with power-law creep explains deformation after the 2011 Tohoku mega-quake, Nature Communications, 10:1385, 2019.
  20. 16. Takuma Yamaguchi, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Lalith Maddegedara, Acceleration of unstructured implicit low-order finite-element earthquake simulation using OpenACC on Pascal GPUs, International Journal of High Performance Computing and Networking (IJHPCN), Vol. 13, No. 1, 2019.
  21. Kahori Iiyama, Atsushi Yoshiyuki, Kohei Fujita, Tsuyoshi Ichimura, Hitoshi Morikawa, Muneo Hori, A point-estimate based method for soil amplification estimation using high resolution model under uncertainty of stratum boundary geometry, Soil Dynamics and Earthquake Engineering, https://doi.org/10.1016/j.soildyn.2018.11.028, 2018.
  22. Tsuyoshi Ichimura, Kohei Fujita, Takuma Yamaguchi, Akira Naruse, Jack C. Wells, Thomas C. Schulthess, Tjerk P. Straatsma, Christopher J. Zimmer, Maxime Martinasso, Kengo Nakajima, Muneo Hori, Lalith Maddegedara, A Fast Scalable Implicit Solver for Nonlinear Time-Evolution Earthquake City Problem on Low-Ordered Unstructured Finite Elements with Artificial Intelligence and Transprecision Computing, SC '18 Proceedings of the International Conference for High Performance Computing, Networking, Storage, and Analysis, 49:1-49:11, 2018.
  23. Kohei Fujita, Tsuyoshi Ichimura, Motoki Kazama, Susumu Ohno and Shingo Sato, Development of Three-Dimensional Soil-Amplification Analysis Method for Screening for Seismic Damage to Buried Water-Distribution Pipeline Networks, Geosciences 2018, 8(5), 170; https://doi.org/10.3390/geosciences8050170
  24. Keisuke Katsushima, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori and Lalith Maddegedara, Development of Octree-Based High-Quality Mesh Generation Method for Biomedical Simulation, Computational Science - ICCS 2018. ICCS 2018. Lecture Notes in Computer Science, 10861, doi: 10.1007/978-3-319-93701-4_27, 2018.
  25. Atsushi Yoshiyuki, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori and Lalith Wijerathne, Development of scalable three-dimensional elasto-plastic nonlinear wave propagation analysis method for earthquake damage estimation of soft grounds, Computational Science - ICCS 2018. ICCS 2018. Lecture Notes in Computer Science, 10861, doi: 10.1007/978-3-319-93701-4_1, 2018.
  26. Takuma Yamaguchi, Kohei Fujita, Tsuyoshi Ichimura, Anne Glerum, Ylona van Dinther, Takane Hori, Olaf Schenk, Muneo Hori and Maddegedara Lalith, Viscoelastic Crustal Deformation Computation Method with Reduced Random Memory Accesses for GPU-based Computers, Computational Science - ICCS 2018. ICCS 2018. Lecture Notes in Computer Science, 10861, doi: 10.1007/978-3-319-93701-4_3, 2018.
  27. Tsuyoshi Ichimura, Kohei Fujita, Masashi Horikoshi, Larry Meadows, Kengo Nakajima, Takuma Yamaguchi, Kentaro Koyama, Hikaru Inoue, Akira Naruse, Keisuke Katsushima, Muneo Hori, Maddegedara Lalith, A Fast Scalable Implicit Solver with Concentrated Computation for Nonlinear Time-evolution Problems on Low-order Unstructured Finite Elements, 32nd IEEE International Parallel and Distributed Processing Symposium, 2018.
  28. Toby Simpson, Dimosthenis Pasadakis, Drosos Kourounis, Kohei Fujita, Takuma Yamaguchi, Tsuyoshi Ichimura and Olaf Schenk, Balanced Graph Partition Refinement using the Graph p-Laplacian, Proceedings of the Platform for Advanced Scientific Computing (PASC) Conference, 2018.
  29. Hori M, Ichimura T, Wijerathne L, Ohtani H, Chen J, Fujita K and Motoyama H, Application of High Performance Computing to Earthquake Hazard and Disaster Estimation in Urban Area. Front. Built Environ. 4:1. doi: 10.3389/fbuil.2018.00001, 2018.
  30. Kohei Fujita, Keisuke Katsushima, Tsuyoshi Ichimura, Masashi Horikoshi, Kengo Nakajima, Muneo Hori, Lalith Maddegedara, Wave Propagation Simulation of Complex Multi-Material Problems with Fast Low-Order Unstructured Finite-Element Meshing and Analysis, Proceedings of HPC Asia 2018, 2018.
  31. J. Chen, S. Supprasert, H. O-tani, K. Fujita, Lalith Wijerathne, M. Hori, On elastic waves in granular assemblies: From a continuumnization viewpoint, Mechanics of Materials, 109, 101-113, 2017.
  32. CHEN Jian, HORI Muneo, O-TANI Hideyuki, OISHI Satoru, FUJITA Kohei, MOTOYAMA Hiroki, Proposal of Method of Numerically Manufactured Solutions for Code Verification of Elasto-Plastic Problems, 土木学会論文集A2（応用力学） 73(2) I_165 - I_175 2017年
  33. Jian Chen, Tomohide Takeyama, Hideyuki O-Tani, Kohei Fujita, Hiroki Motoyama, Muneo Hori, Using High Performance Computing for Liquefaction Hazard Assessment with Statistical Soil Models, International Journal of Computational Methods, 2017.
  34. Tsuyoshi Ichimura, Kohei Fujita, Atsushi Yoshiyuki, Pher Errol Quinay, Muneo Hori, Takashi Sakanoue, Performance Enhancement of Three-Dimensional Soil Structure Model via Optimization for Estimating Seismic Behavior of Buried Pipelines, Journal of Earthquake and Tsunami, Vol.11, No.5, 2017. DOI: 10.1142/S1793431117500191
  35. Takuma Yamaguchi, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Maddegedara Lalith and Kengo Nakajima, Implicit Low-Order Unstructured Finite-Element Multiple Simulation Enhanced by Dense Computation using OpenACC, Proceedings of Fourth Workshop on Accelerator Programming Using Directives (WACCPD), 2017.
  36. Kohei Fujita, Tsuyoshi Ichimura, Kentaro Koyama, Hikaru Inoue, Muneo Hori, Lalith Maddegedara, Fast and Scalable Low-order Implicit Unstructured Finite-element Solver for Earth's Crust Deformation Problem, Proceedings of the Platform for Advanced Scientific Computing (PASC) Conference, Article No. 11, ISBN: 978-1-4503-5062-4, doi:10.1145/3093172.3093236, 2017.
  37. Takuma Yamaguchi, Kohei Fujita, Tsuyoshi Ichimura, Takane Hori, Muneo Hori and Lalith Wijerathne, Fast Finite Element Analysis Method Using Multiple GPUs for Crustal Deformation and its Application to Stochastic Inversion Analysis with Geometry Uncertainty, Procedia Computer Science (International Conference on Computational Science), Volume 108, p.765-775, https://doi.org/10.1016/j.procs.2017.05.223, 2017.
  38. Jian Chen, Tomohide Takeyama, Hideyuki O-Tani, Kohei Fujita, Muneo Hori, A Framework for Assessing Liquefaction Hazard for Urban Areas Based on Soil Dynamics, INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS 13(4) 2016.
  39. Kohei Fujita, Keisuke Katsushima, Tsuyoshi Ichimura, Muneo Hori, Lalith Maddegedara, Octree-based Multiple-material Parallel Unstructured Mesh Generation Method for Seismic Response Analysis of Soil-Structure Systems, Procedia Computer Science, Volume 80, 2016, Pages 1624-1634, ISSN 1877-0509, http://dx.doi.org/10.1016/j.procs.2016.05.496.
  40. Kohei Fujita, Tsuyoshi Ichimura, Development Of Large-Scale Three-Dimensional Seismic Ground Strain Response Analysis Method and Its Application to Tokyo using Full K Computer, Journal of Earthquake and Tsunami, Vol. 10, No. 4, 1640017, doi:10.1142/S1793431116400170, 2016.
  41. Kohei Fujita, Takuma Yamaguchi, Tsuyoshi Ichimura, Muneo Hori, Lalith Maddegedara, Acceleration of Element-by-Element Kernel in Unstructured Implicit Low-order Finite-element Earthquake Simulation using OpenACC on Pascal GPUs, Proceedings of Third Workshop on Accelerator Programming Using Directives (WACCPD), p.1-12, 2016.
  42. Ichimura T, Fujita K, Errol Quinay P, et al. Comprehensive Seismic Response Analysis for Estimating the Seismic Behavior of Buried Pipelines Enhanced by Three-Dimensional Dynamic Finite Element Analysis of Ground Motion and Soil Amplification. ASME. J. Pressure Vessel Technol. 2016;138(5):051801-051801-8. doi:10.1115/1.4033250.
  43. Muneo Hori, Tsuyoshi Ichimura, Kohei Fujita, Simulation of seismic wave propagation and amplification, Springer Tracts in Mechanical Engineering, 2016, https://doi.org/10.1007/978-3-319-21048-3_2
  44. 宮本崇，入原渉，鈴木猛康，藤田航平，市村強: 3次元非線形地盤震動解析を用いた堆積層における地盤ひずみの集中効果の検証，土木学会論文集A1 (構造・地震工学), 72, 4, I_768-I_776, 2016, http://doi.org/10.2208/jscejseee.72.I_768
  45. Tsuyoshi Ichimura, Kohei Fujita, Pher Errol Balde Quinay, Lalith Maddegedara, Muneo Hori, Seizo Tanaka, Yoshihisa Shizawa, Hiroshi Kobayashi and Kazuo Minami, Implicit Nonlinear Wave Simulation with 1.08T DOF and 0.270T Unstructured Finite Elements to Enhance Comprehensive Earthquake Simulation, SC15: International Conference for High Performance Computing, Networking, Storage and Analysis.
  46. Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Lalith Maddegedara and Seizo Tanaka, Scalable many-case urban earthquake simulation method for stochastic earthquake disaster estimation, Procedia Computer Science, 51, pp 1483-1493, 2015.
  47. Kohei FUJITA, Tsuyoshi ICHIMURA, Seizo TANAKA, Muneo HORI, Lalith MADDEGEDARA, URBAN EARTHQUAKE SIMULATION USING 3D NONLINEAR GROUND MOTION ANALYSIS AND MULTI-SCENARIO BUILDING RESPONSE ANALYSIS, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 71, 4, I_680-I_688, 2015, doi: 10.2208/jscejseee.71.I_680
  48. Tsuyoshi Ichimura, Kohei Fujita, Seizo Tanaka, Muneo Hori, Maddegedara Lalith, Yoshihisa Shizawa, and Hiroshi Kobayashi, Physics-based urban earthquake simulation enhanced by 10.7 BlnDOF x 30 K time-step unstructured FE non-linear seismic wave simulation, SC14: International Conference for High Performance Computing, Networking, Storage and Analysis, pp 15-26, 2014. doi: 10.1109/SC.2014.7
  49. Shunsuke Homma, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Seckin Citak, Takane Hori, Development of integrated earthquake simulator accounting for parameter uncertainty in fault-to-city system, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering), 2014 (in Japanese with English abstract), 70(4), I199-I209, 2014 .
  50. Shunsuke Homma, Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Seckin Citak and Takane Hori, A physics-based Monte Carlo earthquake disaster simulation accounting for uncertainty in building structure parameters, Procedia Computer Science, 29, pp. 855-865, 2014. DOI: 10.1016/j.procs.2014.05.077
  51. Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, M. L. L. Wijerathne and Seizo Tanaka, A quick earthquake disaster estimation system with fast urban earthquake simulation and interactive visualization, Procedia Computer Science, 29, pp. 866-876, 2014. DOI: 10.1016/j.procs.2014.05.078
  52. Tsuyoshi Ichimura, Kohei Fujita, Muneo Hori, Takashi Sakanoue, Ryo Hamanaka, Three-dimensional Nonlinear Seismic Ground Response Analysis of Local Site Effects for Estimating Seismic Behavior of Buried Pipelines, Journal of Pressure Vessel Technology, American Society of Mechanical Engineers, 136, Paper No: PVT-13-1131, 2014, DOI: 10.1115/1.4026208.
  53. Kohei Fujita, Tsuyoshi Ichimura, Muneo Hori, Wijerathne Maddegedara Lalith Lakshman and Seizo Tanaka, Basic study on speeding up high resolution urban earthquake damage estimation, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering), 69, I415-I424, 2013 (in Japanese with English abstract).
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