Updated on 2021/03/24

写真a

 
UMEDA, Takayuki
 
Organization
Institute for Space-Earth Environmental Research Center for Integrated Data Science Associate professor
Graduate School
Graduate School of Engineering
Title
Associate professor
Contact information
メールアドレス
External link

Degree 1

  1. Doctor of Informatics ( 2004.3   Kyoto University ) 

Research Interests 5

  1. Geoscience

  2. Electromagnetic fields

  3. High performance Computing

  4. Plasma science

  5. Computer simulation

Research Areas 4

  1. Informatics / Computational science  / Computational Science

  2. Energy Engineering / Fundamental plasma  / Plasma Science

  3. Natural Science / Space and planetary sciences  / Upper Atmospheric Physics

  4. Informatics / High performance computing  / High-performance Computing

Current Research Project and SDGs 3

  1. Global kinetic simulation of Geospace

  2. First-principle particle simulation of collsionless shocks

  3. Developments and applications of computational electromagnetics

Research History 2

  1. UCLA-IGPP Postgraduate Researcher

    2004.4 - 2006.3

  2. JSPS Research Fellow

    2001.4 - 2004.3

      More details

    Country:Japan

Education 3

  1. Kyoto University   Graduate School, Division of Information and Communication   Department of Communications and Computer Engineering

    2001.4 - 2004.3

      More details

    Country: Japan

  2. Kyoto University   Graduate School, Division of Information and Communication   Department of Communications and Computer Engineering

    1999.4 - 2001.3

      More details

    Country: Japan

  3. Kyoto University   Faculty of Engineering   School of Electrical and Electronic Engineering

    1995.4 - 1999.3

      More details

    Country: Japan

Professional Memberships 3

  1. Society of Geomagnetism and Earth, Planetary and Space Sciences

  2. Americal Geophysical Union

  3. Japan Geoscience Union

Committee Memberships 6

  1. 京都大学生存圏研究所 KDK共同利用専門委員会   委員  

    2012.4   

  2. サイエンティフィック・システム研究会   A64FXシステムアプリ性能検討WG 推進委員  

    2020.11 - 2022.10   

      More details

    Committee type:Other

  3. サイエンティフィック・システム研究会   メニーコア時代のアプリ性能検討WG 推進委員  

    2017.1 - 2018.12   

  4. 生存圏フォーラム   運営委員  

    2014.6 - 2018.2   

  5. サイエンティフィック・システム研究会   ポストペタアプリ性能WG 推進委員  

    2014.3 - 2016.2   

  6. サイエンティフィック・システム研究会   マルチコアクラスタ性能WG 推進委員  

    2010.12 - 2013.5   

▼display all

Awards 5

  1. 2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2018) Poster Prize

    2018.11   Division of Plasma Physics, Association of Asia Pacific Physical Societies   Non-MHD effects in the nonlinear development of the MHD-scale Rayleigh-Taylor instability

    T. Umeda and Y. Wada

     More details

    Award type:Award from international society, conference, symposium, etc. 

  2. 科学技術分野の文部科学大臣表彰 若手科学者賞

    2015.4   文部科学省   先端的宇宙プラズマ計算機シミュレーション手法の研究

     More details

    Award type:International academic award (Japan or overseas)  Country:Japan

  3. 大林奨励賞

    2012.10   地球電磁気・地球惑星圏学会   計算機シミュレーション手法の開発とその宇宙プラズマ現象への応用

     More details

    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  4. Best Presentations Award for International Conference of Frontiers in Computational Science 2008 Grant Prix

    2008.11   Frontiers in Computational Science 2008 Program Committee   Vlasov code simulation of GEM reconnection challenge

    K. Togano, T. Umeda, and T. Ogino

     More details

    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  5. International Union of Radio Science Young Scientist Award

    2005.10   International Union of Radio Science  

     More details

    Award type:Award from international society, conference, symposium, etc. 

 

Papers 93

  1. Evaluating higher moments in the transverse Kelvin-Helmholtz instability by full kinetic simulation Reviewed

    Umeda T.

    Physics of Plasmas   Vol. 27 ( 3 )   2020.3

     More details

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

    DOI: 10.1063/1.5139442

    Scopus

  2. Stability of Contact Discontinuities in Electrostatic Hybrid- and Full-Vlasov Simulations Reviewed

    Tsujine Naru, Haruki Takayuki, Umeda Takayuki, Nariyuki Yasuhiro, Sato Masahiro

    PLASMA AND FUSION RESEARCH   Vol. 15   2020.2

     More details

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

    DOI: 10.1585/pfr.15.1401002

    Web of Science

    Scopus

  3. Disturbance of the Front Region of Magnetic Reconnection Outflow Jets due to the Lower-Hybrid Drift Instability Reviewed

    Nakamura T. K. M., Umeda T., Nakamura R., Fu H. S., Oka M.

    PHYSICAL REVIEW LETTERS   Vol. 123 ( 23 )   2019.12

     More details

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

    DOI: 10.1103/PhysRevLett.123.235101

    Web of Science

  4. Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks Reviewed

    Yamazaki Ryo, Shinoda Ayato, Umeda Takayuki, Matsukiyo Shuichi

    AIP ADVANCES   Vol. 9 ( 12 )   2019.12

     More details

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

    DOI: 10.1063/1.5129067

    Web of Science

    Scopus

  5. Vlasov code simulation of contact discontinuities Reviewed

    Umeda T.

    Physics of Plasmas   Vol. 26 ( 10 )   2019.10

     More details

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

    DOI: 10.1063/1.5100314

    Scopus

  6. Multi-step Boris rotation schemes for Lorentz force equation of charged particles

    Umeda T.

    Computer Physics Communications   Vol. 237   page: 37-41   2019.4

     More details

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

    DOI: 10.1016/j.cpc.2018.11.001

    Scopus

  7. Full particle-in-cell simulation of the interaction between two plasmas for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers

    Umeda Takayuki, Yamazaki Ryo, Ohara Yutaka, Ishizaka Natsuki, Kakuchi Shin, Kuramitsu Yasuhiro, Matsukiyo Shuichi, Miyata Itaru, Morita Taichi, Sakawa Youichi, Sano Takayoshi, Sei Shuto, Tanaka Shuta J., Toda Hirohumi, Tomita Sara

    PHYSICS OF PLASMAS   Vol. 26 ( 3 )   2019.3

     More details

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

    DOI: 10.1063/1.5079906

    Web of Science

    Scopus

  8. Magnetosonic/whistler mode turbulence influences on ion dynamics

    Saito S., Nariyuki Y., Umeda T.

    PHYSICS OF PLASMAS   Vol. 25 ( 12 )   2018.12

     More details

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

    DOI: 10.1063/1.5053760

    Web of Science

    Scopus

  9. On the Boris solver in particle-in-cell simulation

    Zenitani Seiji, Umeda Takayuki

    PHYSICS OF PLASMAS   Vol. 25 ( 11 )   2018.11

     More details

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

    DOI: 10.1063/1.5051077

    Web of Science

  10. Electromagnetic linear dispersion relation for plasma with a drift across magnetic field revisited Reviewed

    Umeda T., Nakamura T. K. M.

    Physics of Plasmas   Vol. 25 ( 10 )   2018.10

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.5050542

    Scopus

  11. A three-step Boris integrator for Lorentz force equation of charged particles Reviewed

    Umeda Takayuki

    COMPUTER PHYSICS COMMUNICATIONS   Vol. 228   page: 1-4   2018.7

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.cpc.2018.03.019

    Web of Science

    Scopus

  12. Decay of nonlinear whistler mode waves: 1D versus 2D Reviewed

    Umeda Takayuki, Saito Shinji, Nariyuki Yasuhiro

    PHYSICS OF PLASMAS   Vol. 25 ( 7 )   2018.7

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.5031483

    Web of Science

    Scopus

  13. Performance Evaluation and Optimization of MagnetoHydroDynamic Simulation for Planetary Magnetosphere with Xeon Phi KNL Reviewed

    Fukazawa K., Soga T., Umeda T., Nanri T.

    Advances in Parallel Computing   Vol. 32   page: 178-187   2018.1

     More details

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

    DOI: 10.3233/978-1-61499-843-3-178

    Scopus

  14. Performance Analysis of CPU and DRAM Power Constrained Systems with Magnetohydrodynamic Simulation Code Reviewed

    Fukazawa Keiichiro, Ueda Masatsugu, Inadomi Yuichi, Aoyagi Mutsumi, Umeda Takayuki, Inoue Koji

    IEEE 20TH INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE COMPUTING AND COMMUNICATIONS / IEEE 16TH INTERNATIONAL CONFERENCE ON SMART CITY / IEEE 4TH INTERNATIONAL CONFERENCE ON DATA SCIENCE AND SYSTEMS (HPCC/SMARTCITY/DSS)     page: 626-631   2018

     More details

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

    DOI: 10.1109/HPCC/SmartCity/DSS.2018.00113

    Web of Science

    Scopus

  15. Generation of intermittent ion acoustic waves in whistler-mode turbulence Reviewed

    Saito S., Nariyuki Y., Umeda T.

    PHYSICS OF PLASMAS   Vol. 24 ( 7 )   2017.7

     More details

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

    DOI: 10.1063/1.4990443

    Web of Science

  16. Non-MHD effects in the nonlinear development of the MHD-scale Rayleigh-Taylor instability Reviewed

    Umeda Takayuki, Wada Yasutaka

    PHYSICS OF PLASMAS   Vol. 24 ( 7 )   2017.7

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4991409

    Web of Science

  17. Rapid decay of nonlinear whistler waves in two dimensions: Full particle simulation Reviewed

    Umeda Takayuki, Saito Shinji, Nariyuki Yasuhiro

    PHYSICS OF PLASMAS   Vol. 24 ( 5 )   2017.5

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4982609

    Web of Science

  18. Secondary instabilities in the collisionless Rayleigh-Taylor instability: Full kinetic simulation Reviewed

    T. Umeda, Y. Wada

    Physics of Plasmas   Vol. 23 ( 11 ) page: 112117 (8pp.)   2016.11

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4967859

  19. Three-dimensional development of front region of plasma jets generated by magnetic reconnection Reviewed

    Nakamura T. K. M., Nakamura R., Baumjohann W., Umeda T., Shinohara I.

    GEOPHYSICAL RESEARCH LETTERS   Vol. 43 ( 16 ) page: 8356-8364   2016.8

     More details

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

    DOI: 10.1002/2016GL070215

    Web of Science

    Scopus

  20. Evaluating gyro-viscosity in the Kelvin-Helmholtz instability by kinetic simulations Reviewed

    T. Umeda, N. Yamauchi, Y. Wada, S. Ueno

    Physics of Plasmas   Vol. 23 ( 5 ) page: 054506 (4pp.)   2016.5

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4952632

  21. Performance comparison of Eulerian kinetic Vlasov code between flat-MPI parallelism and hybrid parallelism on Fujitsu FX100 supercomputer

    Umeda Takayuki, Fukazawa Keiichiro

    PROCEEDINGS OF THE 23RD EUROPEAN MPI USERS' GROUP MEETING (EUROMPI 2016)   Vol. 25-28-September-2016   page: 218-221   2016

     More details

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

    DOI: 10.1145/2966884.2966891

    Web of Science

    Scopus

  22. Toward the Generation of Magnetized Collisionless Shocks with High-Power Lasers

    Shoji Yoshitaka, Yamazaki Ryo, Tomita Sara, Kawamura Yushiro, Ohira Yutaka, Tomiya Satoshi, Sakawa Yoichi, Sano Takayoshi, Hara Yukiko, Kondo Sarana, Shimogawara Hiroshi, Matsukiyo Shuichi, Morita Taichi, Tomita Kentaro, Yoneda Hitoki, Nagamine Kazunori, Kuramitsu Yasuhiro, Moritaka Toseo, Ohnishi Naofumi, Umeda Takayuki, Takabe Hideaki

    PLASMA AND FUSION RESEARCH   Vol. 11 ( 2 )   2016

     More details

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

    DOI: 10.1585/pfr.11.3401031

    Web of Science

    Scopus

  23. Note on one-fluid modeling of low-frequency Alfvenic fluctuations in a solar wind plasma with multi-ion components Reviewed

    Y. Nariyuki, T. Umeda, T. K. Suzuki, T. Hada

    Physics of Plasmas   Vol. 22 ( 12 ) page: 124502 (4pp.)   2015.12

     More details

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

    DOI: 10.1063/1.4936798

  24. Nonlinear damping of a finite amplitude whistler wave due to modified two stream instability Reviewed

    S. Saito, T. Umeda, Y. Nariyuki

    Physics of Plasmas   Vol. 22 ( 7 ) page: 072105 (7pp.)   2015.7

     More details

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

    DOI: 10.1063/1.4926523

  25. A high-resolution global Vlasov simulation of a small dielectric body with a weak intrinsic magnetic field on the K computer Invited Reviewed

    T. Umeda, K. Fukazawa

    Earth, Planets and Space   Vol. 67 ( 1 ) page: 49   2015.4

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-015-0216-0

  26. Performance comparison of open-source parallel sorting with OpenMP

    Umeda Takayuki, Oya Shuhei

    PROCEEDINGS OF 2015 THIRD INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)     page: 334-340   2015

     More details

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

    DOI: 10.1109/CANDAR.2015.25

    Web of Science

    Scopus

  27. Performance tuning of Vlasov code for space plasma on the K computer

    T. Umeda, K. Fukazawa

    AsiaSim 2014, Communications in Computer and Information Science   Vol. 474   page: 127-138   2014.11

     More details

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

  28. Electron acceleration during the decay of nonlinear whistler waves in low-beta electron-ion plasma Reviewed

    T. Umeda, S. Saito, Y. Nariyuki

    Astrophysical Journal   Vol. 794 ( 1 ) page: 63 (10pp.)   2014.10

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/0004-637X/794/1/63

  29. Ion kinetic effects to nonlinear processes of the Kelvin-Helmholtz instability Reviewed

    T. Umeda, S. Ueno, T. K. M. Nakamura

    Plasma Physics and Controlled Fusion   Vol. 56 ( 7 ) page: 075006 (11pp.)   2014.5

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/0741-3335/56/7/075006

  30. Entry of solar-wind ions into the wake of a small body with a magnetic anomaly: A global Vlasov simulation Reviewed

    T. Umeda, Y. Ito

    Planetary and Space Science   Vol. 93   page: 35-40   2014.4

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.pss.2014.02.002

  31. Some remarks on the diffusion regions in magnetic reconnection Reviewed

    S. Zenitani, T. Umeda

    Physics of Plasmas   Vol. 21 ( 3 ) page: 034503 (5pp.)   2014.3

     More details

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

    DOI: 10.1063/1.4869717

  32. Performance measurements of MHD simulation for planetary magnetosphere on Peta-scale computer FX10 Reviewed

    K. Fukazawa, T. Nanri, T. Umeda

    Parallel Computing: Accelerating Computational Science and Engineering, Advances in Parallel Computing   Vol. 25   page: 387-394   2014.3

     More details

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

    DOI: 10.3233/978-1-61499-381-0-387

  33. Ion acceleration by parallel propagating nonlinear Alfven wave packets in a radially expanding plasma Reviewed

    Y. Nariyuki, T. Umeda, T. K. Suzuki, T. Hada

    Nonlinear Processes in Geophysics   Vol. 21 ( 1 ) page: 339-346   2014.2

     More details

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

    DOI: 10.5194/npg-21-339-2014

  34. Dynamics and microinstabilities at perpendicular collisionless shock: A comparison of large-scale two-dimensional full particle simulations with different ion to electron mass ratio Reviewed

    T. Umeda, Y. Kidani, S. Matsukiyo, R. Yamazaki

    Physics of Plasmas   Vol. 21 ( 2 ) page: 022102 (10pp.)   2014.2

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4863836

  35. Performance tuning of Vlasov code for space plasma on the K computer

    Umeda T., Fukazawa K.

    Communications in Computer and Information Science   Vol. 474   page: 127-138   2014.1

     More details

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

    Scopus

  36. Performance evaluation of magnetohydrodynamics simulation for magnetosphere on K computer Reviewed

    K. Fukazawa, T. Nanri, T. Umeda

    AsiaSim 2013, Communications in Computer and Information Science   Vol. 402   page: 570-576   2013.11

     More details

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

  37. Performance measurement of parallel Vlasov code for space plasma on scalar-type supercomputer systems with large number of cores Reviewed

    T. Umeda, K. Fukazawa

    AsiaSim 2013, Communications in Computer and Information Science   Vol. 402   page: 561-569   2013.11

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  38. A primitive kinetic-fluid model for quasi-parallel propagating magnetohydrodynamic waves

    Y. Nariyuki, S. Saito, T. Umeda

    Physics of Plasmas   Vol. 20 ( 7 )   2013.7

     More details

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

    DOI: 10.1063/1.4816809

    Web of Science

    Scopus

    J-GLOBAL

  39. Performance measurement of magnetohydrodynamic code for space plasma on the typical scalar type supercomputer systems with the large number of cores Reviewed

    K. Fukazawa, T. Umeda

    International Journal of High Performance Computing   Vol. 26 ( 3 ) page: 310-318   2012.8

     More details

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

    DOI: 10.1177/1094342011434813

  40. A numerical electromagnetic linear dispersion relation for Maxwellian ring-beam velocity distributions Reviewed

    T. Umeda, S. Matsukiyo, T. Amano, Y. Miyoshi

    Physics of Plasmas   Vol. 19 ( 7 ) page: 072107   2012.6

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4736848

  41. A scalable full electromagnetic Vlasov solver for cross-scale coupling in space plasma Reviewed

    T. Umeda, K. Fukazawa, Y. Nariyuki, T. Ogino

    IEEE Transactions on Plasma Science   Vol. 40 ( 5 ) page: 1421-1428   2012.5

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TPS.2012.2188141

  42. Vlasov simulation of electrostatic solitary structures in multi-component plasmas Reviewed

    T. Umeda, M. Ashour-Abdalla, J. S. Pickett,M. L. Goldstein

    Journal of Geophysical Research   Vol. 117 ( A05 ) page: A05223   2012.5

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2011JA017181

  43. A non-oscillatory and conservative semi-Lagrangian scheme with fourth-degree polynomial interpolation for solving the Vlasov equation

    T. Umeda, Y. Nariyuki, D. Kariya

    Computer Physics Communications   Vol. 183 ( 5 ) page: 1094-1100   2012.5

     More details

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

    DOI: 10.1016/j.cpc.2012.01.011

    Web of Science

    Scopus

    J-GLOBAL

  44. Microinstabilities at perpendicular collisionless shocks: A comparison of full particle simulations with different ion to electron mass ratio Reviewed

    T. Umeda, Y. Kidani, S. Matsukiyo, R. Yamazaki

    Physics of Plasmas   Vol. 19 ( 4 ) page: 042109   2012.4

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.3703319

  45. Effect of ion cyclotron motion on the structure of wakes: A Vlasov simulation Reviewed

    T. Umeda

    Earth, Planets and Space   Vol. 64 ( 2 ) page: 231-236   2012.3

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  46. Modified two-stream instability at perpendicular collisionless shocks: Full particle simulations Reviewed

    T. Umeda, Y. Kidani, S. Matsukiyo, R. Yamazaki

    Journal of Geophysical Research   Vol. 117 ( A03 ) page: A03206   2012.3

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    A full particle simulation study is carried out for studying microinstabilities generated in self-consistently excited perpendicular collisionless shocks. The present two-dimensional simulation with a high ion-to-electron mass ratio shows that the modified two-stream instability can be generated by the interaction of incoming and reflected ions with electromagnetic whistler mode waves propagating in the direction quasi-perpendicular to the ambient magnetic field. Properties of the excited whistler mode waves are consistent with the linear dispersion analysis based on the simulated velocity distribution functions. It is also found that the excited waves have an electron-scale wavelength in the shock-normal direction and an ion-scale wavelength in the shock-tangential direction, suggesting that the electron-scale microturbulences and the ion-scale shock structures are coupled with each other through the modified two-stream instability.

    DOI: 10.1029/2011JA017182

  47. Relativistic electron shock drift acceleration in low Mach number galaxy cluster shocks Reviewed

    S. Matsukiyo, Y. Ohira, R. Yamazaki, T. Umeda

    Astrophysical Journal   Vol. 742 ( 1 ) page: 47   2011.11

     More details

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

  48. Suppression of reflected electrons by kinetic Alfven turbulence in a quasi-perpendicular shock: Particle-in-cell simulations Reviewed

    S. Saito, T. Umeda

    Astrophysical Journal   Vol. 736 ( 1 ) page: 35   2011.7

     More details

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

  49. Nonlinear evolution of parallel propagating Alfven waves: Vlasov-MHD simulation Reviewed

    Y. Nariyuki, T. Umeda, T. Kumashiro, T. Hada

    Planetary and Space Science   Vol. 59 ( 8 ) page: 767-771   2011.6

     More details

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

  50. Nonlinear evolution of parallel propagating Alfven waves: Vlasov-MHD simulation

    Y. Nariyuki, T. Umeda, T. Kumashiro, T. Hada

    Planetary and Space Science   Vol. 59 ( 8 ) page: 767-771   2011.6

     More details

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

    DOI: 10.1016/j.pss.2011.02.017

    Web of Science

    Scopus

    J-GLOBAL

  51. Cross-scale coupling at a perpendicular collisionless shock

    T. Umeda, M. Yamao, R. Yamazaki

    Planetary and Space Science   Vol. 59 ( 7 ) page: 449-455   2011.5

     More details

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

    DOI: 10.1016/j.pss.2010.01.007

    Web of Science

    Scopus

    J-GLOBAL

  52. Quasilinear theory and simulation of Buneman instability

    J. Pavan, P. H. Yoon, T. Umeda

    Physics of Plasmas   Vol. 18 ( 4 ) page: 42307   2011.4

     More details

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

    DOI: 10.1063/1.3574359

    Web of Science

    Scopus

    J-GLOBAL

  53. Self-consistent kinetic numerical simulation model for ring current particles in the Earth's inner magnetosphere

    T. Amano, K. Seki, Y. Miyoshi, T. Umeda, Y. Matsumoto, Y. Ebihara, S. Saito

    Journal of Geophysical Research   Vol. 116 ( 2 ) page: 2216   2011.2

     More details

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

    DOI: 10.1029/2010JA015682

    Web of Science

    Scopus

    J-GLOBAL

  54. Vlasov simulation on the interaction between solar wind and a dielectric body

    T. Umeda, T. Kimura, K. Togano, K. Fukazawa, Y. Matsumoto, T. Miyoshi, N. Terada, T. K. M. Nakamura, T. Ogino

    Physics of Plasmas   Vol. 18 ( 1 ) page: 12908   2011.1

     More details

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

    DOI: 10.1063/1.3551510

    Web of Science

    Scopus

    J-GLOBAL

  55. Vlasov Code Simulation of Cross-scale Coupling in Space Plasmas

    Umeda Takayuki, Matsumoto Yosuke, Nakamura Takuma K. M., Fukazawa Keiichiro, Ogino Tatsuki

    NUMERICAL MODELING OF SPACE PLASMA FLOWS - ASTRONUM 2010   Vol. 444   page: 182-+   2011

     More details

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

    Web of Science

  56. Nonlinear turbulence theory and simulation of Buneman instability

    P. H. Yoon, T. Umeda

    Physics of Plasmas   Vol. 17 ( 11 ) page: 112317   2010.11

     More details

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

    DOI: 10.1063/1.3517103

    Web of Science

    Scopus

    J-GLOBAL

  57. On the reformation at quasi- and exactly-perpendicular shocks: Full particle-in-cell simulations

    T. Umeda, Y. Kidani, M. Yamao, S. Matsukiyo, R. Yamazaki

    Journal of Geophysical Research   Vol. 115 ( 10 ) page: 10250   2010.10

     More details

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

    DOI: 10.1029/2010JA015458

    Web of Science

    Scopus

    J-GLOBAL

  58. Comparative study of global MHD simulations of the terrestrial magnetosphere with different numerical schemes

    Y. Matsumoto, N. Terada, T. Miyoshi, K. Fukazawa, T. Umeda, T. Ogino, K. Seki

    IEEE Transactions on Plasma Science   Vol. 38 ( 9 ) page: 2229-2235   2010.9

     More details

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

    DOI: 10.1109/TPS.2010.2056704

    Web of Science

    Scopus

    J-GLOBAL

  59. The HLLD approximate Riemann solver for magnetospheric simulation

    T. Miyoshi, N. Terada, Y. Matsumoto, K. Fukazawa, T. Umeda, K. Kusano

    IEEE Transactions on Plasma Science   Vol. 38 ( 9 ) page: 2236-2242   2010.9

     More details

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

    DOI: 10.1109/TPS.2010.2057451

    Web of Science

    Scopus

    J-GLOBAL

  60. Performance measurement of magneto-hydro-dynamic code for space plasma on the various scalar type supercomputer systems

    K. Fukazawa, T. Umeda, T. Miyoshi, N. Terada, Y. Matsumoto, T. Ogino

    IEEE Transactions on Plasma Science   Vol. 38 ( 9 ) page: 2254-2259   2010.9

     More details

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

    DOI: 10.1109/TPS.2010.2055162

    Web of Science

    Scopus

    J-GLOBAL

  61. Full electromagnetic Vlasov code simulation of the Kelvin-Helmholtz instability

    T. Umeda, J. Miwa, Y. Matsumoto, T. K. M. Nakamura, K. Togano, K. Fukazawa, I. Shinohara

    Physics of Plasmas   Vol. 17 ( 5 ) page: 52311   2010.5

     More details

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

    DOI: 10.1063/1.3422547

    Web of Science

    Scopus

    J-GLOBAL

  62. Structures of diffusion regions in collisionless magnetic reconnection

    T. Umeda, K. Togano, T. Ogino

    Physics of Plasmas   Vol. 17 ( 5 ) page: 52103   2010.5

     More details

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

    DOI: 10.1063/1.3403345

    Web of Science

    Scopus

    J-GLOBAL

  63. On the nonlinearity of the Langmuir turbulence excited by a weak electron beam-plasma interaction

    Y. Nariyuki, T. Umeda

    Physics of Plasmas   Vol. 17 ( 5 ) page: 54506   2010.5

     More details

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

    DOI: 10.1063/1.3425872

    Web of Science

    Scopus

    J-GLOBAL

  64. Electromagnetic plasma emission during beam-plasma interaction: Parametric decay versus induced scattering

    T. Umeda

    Journal of Geophysical Research   Vol. 115 ( 1 ) page: 1204   2010.1

     More details

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

    DOI: 10.1029/2009JA014643

    Web of Science

    Scopus

    J-GLOBAL

  65. Vlasov simulation of finite amplitude magnetohydrodynamic waves in the solar wind: Development of Vlasov-Hall-MHD code

    T. Kumashiro, T. Hada, Y. Nariyuki, T. Umeda

    Journal of Plasma and Fusion Research SERIES   Vol. 8   page: 831-836   2009.9

     More details

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

  66. Implementation of non-oscillatory and conservative scheme into magnetohydrodynamic equations

    S. Tanaka, T. Umeda, Y. Matsumoto, T. Miyoshi, T. Ogino

    Earth, Planets and Space   Vol. 61 ( 7 ) page: 895-903   2009.7

     More details

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

  67. Cluster observations and numerical modeling of energy-dispersed Ionospheric H+ ions bouncing at the PSBL

    J. M. Bosqued, M. Ashour-Abdalla, T. Umeda, M. El Alaoui, V. Peroomian, H. U. Frey, A. Marchaudon, H. Laakso

    Journal of Geophysical Research   Vol. 114 ( 4 )   2009.4

     More details

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

    DOI: 10.1029/2008JA013562

    Web of Science

    Scopus

    J-GLOBAL

  68. Electron acceleration at a low-Mach-number perpendicular collisionless shock Reviewed

    T. Umeda, M. Yamao, R. Yamazaki

    Astrophysical Journal   Vol. 695 ( 1 ) page: 574-579   2009.4

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    A full particle simulation study is carried out on the electron acceleration at a collisionless, relatively low Alfven Mach number (M_A = 5), perpendicular shock. Recent self-consistent hybrid shock simulations have demonstrated that the shock front of perpendicular shocks has a dynamic rippled character along the shock surface of low Mach number perpendicular shocks. In this paper, the effect of the rippling of perpendicular shocks on the electron acceleration is examined by means of large-scale (ion-scale) two-dimensional full particle simulations. It has been shown that a large-amplitude electric field is excited at the shock front in association with the ion-scale rippling, and that reflected ions are accelerated upstream at a localized region where the shock-normal electric field of the rippled structure is polarized upstream. The current-driven instability caused by the highly accelerated reflected ions has a high growth rate of up to large-amplitude electrostatic waves. Energetic electrons are then generated by the large-amplitude electrostatic waves via electron surfing acceleration at the leading edge of the shock-transition region. The present result suggests that the electron surfing acceleration is also a common feature at low Mach number perpendicular collisionless shocks.

  69. Two-dimensional full-electromagnetic Vlasov code with conservative scheme and its application to magnetic reconnection

    T. Umeda, K. Togano, T. Ogino

    Computer Physics Communications   Vol. 180 ( 3 ) page: 365-374   2009.3

     More details

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

    A detailed procedure of full-electromagnetic Vlasov simulation technique is presented. Our new unsplitting conservative scheme exactly satisfies the continuity equation for charge. The implicit Finite Difference Time Domain method is also adopted for computation of electromagnetic fields, which is not restricted by the CFL condition for light. The Geospace Environment Modeling magnetic reconnection challenge problem is adopted as a benchmark test. The characteristics of the present Vlasov code are studied by varying the resolution in configuration space.

    DOI: 10.1016/j.cpc.2008.11.001

    Web of Science

    Scopus

    J-GLOBAL

  70. Modeling PSBL high speed ion beams observed by Cluster and Double Star Reviewed

    M. Ashour-Abdalla, J. M. Bosqued, M. El Alaoui, V. Peroomian, T. Umeda, J. Walker

    Advances in Space Research   Vol. 41 ( 10 ) page: 1598-1610   2008.10

     More details

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

  71. Vlasov simulation of Langmuir decay instability

    T. Umeda, T. Ito

    Physics of Plasmas   Vol. 15 ( 8 ) page: 84503   2008.8

     More details

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

    DOI: 10.1063/1.2965494

    Web of Science

    Scopus

    J-GLOBAL

  72. Two-dimensional full particle simulation of a perpendicular collisionless shock with a shock-rest-frame model

    Umeda Takayuki, Yamao Masahiro, Yamazaki Ryo

    ASTROPHYSICAL JOURNAL LETTERS   Vol. 681 ( 2 ) page: L85-L88   2008.7

     More details

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

    Web of Science

  73. Modeling PSBL high speed ion beams observed by Cluster and Double Star

    M. Ashour-Abdalla, J. M. Bosqued, M. El Alaoui, V. Peroomian, T. Umeda, J. Walker

    Advances in Space Research   Vol. 41 ( 10 ) page: 1598-1610   2008

     More details

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

    DOI: 10.1016/j.asr.2007.04.018

    Web of Science

    Scopus

    J-GLOBAL

  74. Numerical study of electrostatic electron cyclotron harmonic wave due to Maxwellian ring velocity distributions Reviewed

    T. Umeda

    Earth, Planets and Space   Vol. 59 ( 11 ) page: 1205-1210   2007.11

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  75. Parametric decay of Alfven waves

    S. Tanaka, T. Ogino, T. Umeda

    Journal of Geophysical Research   Vol. 112 ( A10 ) page: 10110   2007.10

     More details

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

    DOI: 10.1029/2007JA012513

    Web of Science

    Scopus

    J-GLOBAL

  76. Turbulent acceleration of superthermal electrons,

    C.-M. Ryu, T. Rhee, T. Umeda, P. H. Yoon, and Y. Omura

    Physics of Plasmas   Vol. 14 ( 10 ) page: 100701   2007.10

     More details

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

    DOI: 10.1063/1.2779282

    Web of Science

    Scopus

    J-GLOBAL

  77. Particle-in-cell simulation of Maxwellian ring velocity distribution

    T. Umeda, M. Ashour-Abdalla, D. Schriver, R. L. Richard, F. V. Coroniti

    Journal of Geophysical Research   Vol. 112 ( A4 ) page: 4212   2007.4

     More details

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

    DOI: 10.1029/2006JA012124

    Web of Science

    Scopus

    J-GLOBAL

  78. Vlasov simulation of Langmuir wave packets

    Umeda T.

    Nonlinear Processes in Geophysics   Vol. 14 ( 5 ) page: 671-679   2007.1

     More details

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

    DOI: 10.5194/npg-14-671-2007

    Scopus

  79. Numerical study of electrostatic electron cyclotron harmonic waves due to Maxwellian ring velocity distributions

    Umeda Takayuki

    EARTH PLANETS AND SPACE   Vol. 59 ( 11 ) page: 1205-1210   2007

     More details

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

    Web of Science

  80. Comparison of numerical interpolation schemes for one-dimensional electrostatic Vlasov code

    T. Umeda, M. Ashour-Abdalla, D. Schriver

    Journal of Plasma Physics   Vol. 72 ( 6 ) page: 1057-1060   2006.12

     More details

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

    DOI: 10.1017/S0022377806005228

    Web of Science

    Scopus

    J-GLOBAL

  81. Nonlinear evolution of the electron two-stream instability: Two-dimensional particle simulations

    T. Umeda, Y. Omura, T. Miyake, H. Matsumoto, M. Ashour-Abdalla

    Journal of Geophysical Research   Vol. 111 ( A10 ) page: 10206-10206   2006.10

     More details

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

    DOI: 10.1029/2006JA011762

    Web of Science

    Scopus

    J-GLOBAL

  82. Particle simulation of a perpendicular collisionless shock: A shock-rest-frame model Reviewed

    T. Umeda, R. Yamazaki

    Earth, Planets and Space   Vol. 58 ( 10 ) page: e41-e43   2006.10

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  83. Cluster observations of energetic ionospheric ion beams in the auroral region: Acceleration and associated energy-dispersed precipitation

    J. M. Bosqued, M. Ashour-Abdalla, A. Marchaudon, H. Laakso, T. Umeda, M. El Alaoui, V. Peroomian, H. Reme, G. Paschmann, M. Dunlop, A. Fazakerley

    Geophysical Research Letters   Vol. 33 ( 12 ) page: 12102-12102   2006.6

     More details

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

    DOI: 10.1029/2006GL025708

    Scopus

    J-GLOBAL

  84. Full particle simulation of a perpendicular collisionless shock: A shock-rest-frame model Reviewed

    Umeda T.

    Earth, Planets and Space   Vol. 58 ( 10 )   2006

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Earth, Planets and Space  

    DOI: 10.1186/bf03352617

    Scopus

  85. Two-dimensional particle simulation of electromagnetic field signature associated with electrostatic solitary waves Reviewed

    T. Umeda, Y. Omura, H. Matsumoto

    Journal of Geophysical Research   Vol. 109 ( A2 ) page: A02207   2004.2

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  86. A new charge conservation method in electromagnetic particle-in-cell simulations Reviewed

    T. Umeda, Y. Omura, T. Tominaga, H. Matsumoto

    Computer Physics Communication   Vol. 156 ( 1 ) page: 73-85   2003.12

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  87. Particle simulation of plasma response to an applied electric field parallel to magnetic field lines Reviewed

    Y. Omura, W. J. Heikkila, T. Umeda, K. Ninomiya, H. Matsumoto

    Journal of Geophysical Research   Vol. 108 ( A5 ) page: 1197   2003.5

     More details

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

  88. Harmonic Langmuir waves. III. Vlasov simulation Reviewed

    T. Umeda, Y. Omura, P. H. Yoon, R. Gaelzer, H. Matsumoto

    Physics of Plasmas   Vol. 10 ( 2 ) page: 382-391   2003.2

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  89. Harmonic Langmuir waves. I. Nonlinear dispersion relation Reviewed

    P. H. Yoon, R. Gaelzer, T. Umeda, Y. Omura, H. Matsumoto

    Physics of Plasmas   Vol. 10 ( 2 ) page: 364-372   2003.2

     More details

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

  90. Harmonic Langmuir waves. II. Turbulence spectrum Reviewed

    R. Gaelzer, P. H. Yoon, T. Umeda, Y. Omura, H. Matsumoto

    Physics of Plasmas   Vol. 10 ( 2 ) page: 373-381   2003.2

     More details

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

  91. Formation of electrostatic solitary waves in space plasmas: Particle simulations with open boundary conditions Reviewed

    T. Umeda, Y. Omura, H. Matsumoto, H. Usui

    Journal of Geophysical Research   Vol. 107 ( A12 ) page: 1449   2002.12

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  92. An improved masking method for absorbing boundaries in electromagnetic particle simulations Reviewed

    T. Umeda, Y. Omura, H. Matsumoto

    Computer Physics Communication   Vol. 137 ( 2 ) page: 286-299   2001.6

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  93. Observational evidence of dissipative small scale processes: Geotail spacecraft observation and simulation of electrostatic solitary waves Reviewed

    Y. Omura, H. Kojima, T. Umeda, H. Matsumoto

    Astrophysics and Space Science   Vol. 277 ( 1 ) page: 45-57   2001.4

     More details

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

▼display all

Books 3

  1. Simulation of collisionless plasma with the Vlasov method

    T. Umeda( Role: Sole author)

    Nova Science  2012.4  ( ISBN:978-1-61324-790-7

     More details

    Language:English

  2. Electromagnetic waves in plasma

    T. Umeda( Role: Sole author)

    In Tech  2011.3  ( ISBN:978-953-307-275-3

     More details

    Language:Japanese

  3. Simulation of electron beam instabilities and nonlinear potential structures

    Y. Omura, T. Umeda, and H. Matsumoto( Role: Joint author)

    Springer-Verlag Berlin Heidelberg  2003.6  ( ISBN:978-354-000-698-2

     More details

    Language:English

Presentations 39

  1. Paradigm shift in program structure of particle-in-cell simulations

    Umeda T.

    Advances in Parallel Computing 

     More details

    Event date: 2020

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.3233/APC200072

    Scopus

  2. Performance Comparison of Eulerian Kinetic Vlasov Code Between Xeon Phi KNL and Xeon Broadwell

    Umeda T.

    Communications in Computer and Information Science 

     More details

    Event date: 2018

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1007/978-981-13-2853-4_12

    Scopus

  3. Hybrid parallelization of hyper-dimensional Vlasov code with OpenMP loop collapse directive

    Umeda T.

    Advances in Parallel Computing 

     More details

    Event date: 2016.1

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.3233/978-1-61499-621-7-265

    Scopus

  4. Performance measurements of MHD simulation for planetary magnetosphere on Peta-scale computer FX10

    K. Fukazawa, T. Nanri, T. Umeda

    Parallel Computing: Accelerating Computational Science and Engineering, Advances in Parallel Computing 

     More details

    Event date: 2014.1

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.3233/978-1-61499-381-0-387

    Scopus

  5. Performance evaluation of magnetohydrodynamics simulation for magnetosphere on K computer

    K. Fukazawa, T. Nanri, T. Umeda

    AsiaSim 2013, Communications in Computer and Information Science 

     More details

    Event date: 2013.1

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1007/978-3-642-45037-2_61

    Scopus

  6. Performance measurement of parallel Vlasov code for space plasma on scalar-type supercomputer systems with large number of cores

    T. Umeda, K. Fukazawa

    AsiaSim 2013, Communications in Computer and Information Science 

     More details

    Event date: 2013.1

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1007/978-3-642-45037-2_60

    Scopus

  7. Performance measurement of parallel Vlasov code for space plasma on various scalar-type supercomputer systems

    Umeda T.

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 

     More details

    Event date: 2012.10

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1007/978-3-642-33078-0_17

    Scopus

  8. On the reformation at perpendicular shocks

    T. Umeda, Y. Kidani, S. Matsukiyo

    American Geophysical Union 2011 Fall meeting 

     More details

    Event date: 2011.12

    Language:English   Presentation type:Oral presentation (general)  

  9. Dynamics of quasi-perpendicular shocks: Recent results issued from 2D PIC simulation

    Umeda T.

    2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 

     More details

    Event date: 2011.11

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1109/URSIGASS.2011.6051058

    Scopus

  10. Study of the moon-solar wind interaction with parallel kinetic plasma simulations

    T. Umeda, Y. Ito, Y. Kidani, K. Fukazawa

    International Conference for High Performance Computing, Networking, Storage and Analysis 2011 

     More details

    Event date: 2011.11

    Language:English   Presentation type:Oral presentation (general)  

  11. Dynamics of quasi-perpendicular shocks: Recent results issued from 2D PIC simulation

    T. Umeda, Y. Kidani, S. Matsukiyo

    30th General Assembly of the International Union of Radio Science (URSI) 

     More details

    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

  12. Recent Advancement in Vlasov code simulations

    T. Umeda

    10th International School for Space Simulations (ISSS-10) 

     More details

    Event date: 2011.7

    Language:English   Presentation type:Oral presentation (general)  

  13. Highly scalable full electromagnetic Vlasov solver for cross-scale coupling in space plasma

    T. Umeda, K. Fukazawa, Y. Nariyuki, Y. Matsumoto, T. K. M. Nakamura

    International Conference for High Performance Computing, Networking, Storage and Analysis 2010 

     More details

    Event date: 2010.11

    Language:English   Presentation type:Oral presentation (general)  

  14. Effect of ion cyclotron motion on the structure of wakes International conference

    5th Alfven Conference on Plasma Interaction with Non-magnetized Planets/Moons and its Influence on Planetary Evolution 

     More details

    Event date: 2010.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  15. Electromagnetic plasma emission during beam-plasma interaction International conference

    2010 Asia-Pacific Radio Science Conference 

     More details

    Event date: 2010.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  16. Cross-scale coupling at a collisionless shock

    38th COSPAR Scientific Assembly 

     More details

    Event date: 2010.7

    Language:English   Presentation type:Oral presentation (general)  

  17. Vlasov code simulation of cross-scale coupling in space plasmas International conference

    5th International Conference on Numerical Modeling of Space Plasma Flows 

     More details

    Event date: 2010.6

    Language:English   Presentation type:Oral presentation (general)  

  18. STPシミュレーションの過去・現在・未来

    梅田 隆行

    宇宙地球惑星科学若手会 2009年夏の学校 

     More details

    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  19. Cross-scale coupling at a collisionless shock International conference

    International Association of Geomagnetism and Aeronomy (IAGA) 11th Scientific Assembly 

     More details

    Event date: 2009.8

    Language:English   Presentation type:Oral presentation (general)  

  20. New Vlasov simulation techniques for multi-scale dynamics of magnetosphere International conference

     More details

    Event date: 2009.8

    Language:English   Presentation type:Oral presentation (invited, special)  

  21. Simulations and numerical linear analyses of kinetic instabilities International conference

    9th International School for Space Simulations 

     More details

    Event date: 2009.7

    Language:English   Presentation type:Oral presentation (invited, special)  

  22. ブラソフシミュレーションでジオスペースを解く

    梅田 隆行

     More details

    Event date: 2009.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  23. New Vlasov simulation techniques for scale coupling in the plasma universe International conference

    Workshop on Cross-Scale Coupling in Plasmas 

     More details

    Event date: 2009.3

    Language:English   Presentation type:Oral presentation (general)  

  24. Status of Japanese young simulationists International conference

    ERG, SCOPE and Beyond 

     More details

    Event date: 2008.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  25. STPシミュレーションコード開発の将来展望

    梅田 隆行, 寺田 直樹, 杉山 徹, 三好 隆博, 松本 洋介, 加藤 雄人, 深沢 圭一郎, 篠原 育, 中村琢磨

    第124回地球電磁気・地球惑星圏学会 

     More details

    Event date: 2008.10

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  26. Two-dimensional Vlasov code simulation of magnetic reconnection International conference

    US-Japan Workshop on Magnetic Reconnection 2008 

     More details

    Event date: 2008.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  27. ブラソフシミュレーションで拓く太陽地球惑星科学

    梅田 隆行, 寺田 直樹, 杉山 徹, 三好 隆博, 松本 洋介, 加藤 雄人, 深沢 圭一郎, 篠原 育

    第21回数値流体力学シンポジウム 

     More details

    Event date: 2007.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  28. Full particle simulation of perpendicular collisionless shocks with a shock-rest-frame model International conference

    American Geophysical Union 2007 Fall meeting 

     More details

    Event date: 2007.12

    Language:English   Presentation type:Oral presentation (general)  

  29. Vlasov simulation of beam-plasma interactions International conference

    8th International School/Symposium for Space Simulations 

     More details

    Event date: 2007.2

    Language:English   Presentation type:Oral presentation (invited, special)  

  30. Polynomial interpolation for hyperbolic conservation laws (PIC) scheme: Application to Vlasov Simulations International conference

    CAWSES International Workshop on Space Weather Modeling 

     More details

    Event date: 2006.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  31. Vlasov simulation of amplitude-modulated Langmuir waves International conference

    6th International Workshop on Nonlinear Waves and Turbulence in Space Plasmas 

     More details

    Event date: 2006.10

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  32. Nonlinear evolution of electron two-stream instability: Two-dimensional particle simulation International conference

    28th General Assembly of the International Union of Radio Science 

     More details

    Event date: 2005.10

    Language:English   Presentation type:Oral presentation (general)  

  33. Generation of electron cyclotron harmonic (ECH) waves due to loss cone distribution functions International conference

    American Geophysical Union 2004 Fall meeting 

     More details

    Event date: 2004.12

    Language:English   Presentation type:Oral presentation (general)  

  34. Particle simulations of electrostatic solitary waves in space plasmas International conference

    7th International Workshop on the Interrelationship between Plasma Experiments in Laboratory and Space 

     More details

    Event date: 2004.7

    Language:English   Presentation type:Oral presentation (invited, special)  

  35. Particle simulations of electromagnetic emissions from electrostatic solitary waves International conference

    23rd General Assembly of the International Union of Geodesy and Geophysics 

     More details

    Event date: 2003.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  36. Particle simulations of electromagnetic emissions from electrostatic solitary waves International conference

    27th General Assembly of the International Union of Radio Science 

     More details

    Event date: 2002.8

    Language:English   Presentation type:Oral presentation (general)  

  37. Formation of electrostatic solitary waves: Two-dimensional particle simulation with open boundary conditions International conference

    2002 Western Pacific Geophysics Meeting 

     More details

    Event date: 2002.7

    Language:English   Presentation type:Oral presentation (general)  

  38. An improved masking method for absorbing boundaries in electromagnetic particle simulations International conference

    6th International School/Symposium for Space Simulations 

     More details

    Event date: 2001.9

    Language:English   Presentation type:Oral presentation (invited, special)  

  39. Electromagnetic particle simulation of electron beam instabilities in 2-D open system International conference

    2001 Asia-Pacific Radio Science Conference 

     More details

    Event date: 2001.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

▼display all

KAKENHI (Grants-in-Aid for Scientific Research) 8

  1. How do fluid simulations reproduce kinetic simulation results?

    Grant number:19H01868  2019.4 - 2024.3

      More details

    Authorship:Principal investigator 

    Grant amount:\16510000 ( Direct Cost: \12700000 、 Indirect Cost:\3810000 )

  2. Study of unified numerical schemes for numerical simulations of electromagnetic fluid plasma: From MHD to multi fluids

    Grant number:15K13572  2015.4 - 2018.3

    UMEDA TAKAYUKI

      More details

    Authorship:Principal investigator 

    Grant amount:\3510000 ( Direct Cost: \2700000 、 Indirect Cost:\810000 )

    The nonlinear evolution of the Kelvin-Helmholtz instability (KHI) and the Rayleigh-Taylor instability (RTI) at a density shear layer transverse to magnetic field in collisionless plasma is investigated by means of a fully kinetic Vlasov simulation with two spatial and two velocity dimensions. Several simulation runs with different ratio of the ion inertial length and/or ion gyro radius to the thickness of the initial shear layer have been performed to discuss “non-MHD effects” such as the ion inertial (Hall) effect and the ion finite Larmor radius (FLR) effect. The result shows that the instabilities develop symmetrically when neither Hall effect or FLR effect are available. An asymmetric development of the instabilities is seen when the Hall effect is available. When the FLR effect is available, a different type of instability with a spatial scale of ion gyro radius is generated, which disturbs the development of the primary instabilities.

  3. Generation of cosmic-ray protons at collisionless shocks via hybrid particle-in-cell simulations

    Grant number:26287041  2014.4 - 2018.3

    UMEDA TAKAYUKI

      More details

    Authorship:Principal investigator 

    Grant amount:\15470000 ( Direct Cost: \11900000 、 Indirect Cost:\3570000 )

    The computational speed of the particle-in-cell-type plasma simulation codes is accelerated by using the counting sort algorithm and the array-particle data structure. Large-scale two-dimensional particle-in-cell simulations are carried out by using the improved code for studying non-stationarity of perpendicular shocks called the reformation. The result implies that the existence of the reformation is controlled by types of micro-instabilities at the shock transition layer.
    One- and two-dimensional particle simulations are also carried out on the development of a large-amplitude whistler-mode waves in the shock transition layer. Relativistic electron acceleration is found in the 1D run. On the other hand, a rapid decay of whistler-mode waves through a new instability is found in the 2D run, which suppress the relativistic electron acceleration.

  4. Six-dimensional plasma simulation

    Grant number:25610144  2013.4 - 2015.3

    UMEDA Takayuki

      More details

    Authorship:Principal investigator 

    Grant amount:\3250000 ( Direct Cost: \2500000 、 Indirect Cost:\750000 )

    A fully six-dimensional electromagnetic Vlasov code has been developed. Work arrays and memory space for the computation of the advection in the configuration space are substantially saved by the transposition of the data arrays for distribution functions. It is confirmed that the transposition efficiently accelerates the computational speed on x86 CPUs. While on SPARC CPUs, the computational efficiency becomes slightly worse.
    We also performed large-scale Vlasov simulation of the Kelvin-Helmholtz instability (KHI) and a weakly-magnetized small body. It is shown that ion-scale secondary instabilities taking place during the nonlinear development of MHD-scale primary KHI are affected by the structure of secondary velocity-shear layers of primary KH vortices. On the other hand, electron-scale charge separation does not affect the structure of MHD-scale magnetosphere but affects wave activities inside the magnetosphere.

  5. Study of cross-scale coupling in space plasma via large-scale Vlasov simulations

    Grant number:23740367  2011 - 2012

    UMEDA Takayuki

      More details

    Authorship:Principal investigator 

    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    We study numerical schemes for the first-principle Vlasov code as a post-Peta-scale computer simulation technique of space plasma. We developed numerical algorithms for solving the collisionless Boltzmann (Vlasov) equation which is a hyper-dimensional conservation law. The new simulation code is parallelized for scalar massively parallel computers with more than 10,000 CPU cores. The new code is applied to various multi-scale processes in space plasma. The first global Vlasov simulation of a magnetized astronomical body is succeeded. Also, it is shown that temporal evolution of fluid-scale Kelvin-Helmholtz vortices generated at a velocity-shear layer is strongly affected by the particle-scale ion gyro motion.

  6. Study of particle acceleration processes at collisionless shocks via next-generation and first-principle particle simulations

    Grant number:21200050  2009 - 2011

    Grant-in-Aid for Scientific Research on Innovative Areas (Research a proposed research project)

    UMEDA Takayuki

      More details

    Authorship:Principal investigator 

    Grant amount:\27040000 ( Direct Cost: \20800000 、 Indirect Cost:\6240000 )

    Large-scale two-dimensional full particle-in-cell simulations are carried out for studying non-stationarity of perpendicular shocks. It is confirmed that the persistence and absence of the self-reformation is controlled by micro-instabilities at the shock front. When electromagnetic whistler mode waves are strongly excited by the modified two-stream instability, both incoming and reflected ions are strongly scattered and the shock reformation becomes absent. On the other hand, when electrostatic waves are weakly excited or there is no micro-instabilities, reflected ions show a coherent behavior and the shock reformation is persistent. In this case, however, the reformation period is modified essentially due to the shock front ripples. The present simulation result suggests that the structure and dynamics of shocks are affected by the cross-scale coupling between electron-scale micro-instabilities and ion-scale shock-front ripples.

  7. Study of Vlasov simulation techniques for next-generation supercomputers

    Grant number:21740352  2009 - 2010

    UMEDA Takayuki

      More details

    Authorship:Principal investigator 

    Grant amount:\3510000 ( Direct Cost: \2700000 、 Indirect Cost:\810000 )

    We study numerical schemes for the first-principle Vlasov code as a second-next-generation computer simulation technique of space plasma. We developed numerical algorithms for solving the collisionless Boltzmann (Vlasov) equation which is a hyper-dimensional conservation law. The new simulation code is parallelized for scalar massively parallel computers and has achieved more than 80% parallel efficiency on more than 1,000 CPU cores. The new code is applied to various multi-scale processes in space plasma. The numerical results imply the existence of cross-scale coupling between fluid scale and particle scale.

  8. Study of Revolutionary Vlasov simulation techniques

    Grant number:19840024  2007 - 2008

    Grant-in-Aid for Young Scientists (Start-up)

    UMEDA Takayuki

      More details

    Authorship:Principal investigator 

    Grant amount:\3105000 ( Direct Cost: \2700000 、 Indirect Cost:\405000 )

▼display all

 

Teaching Experience (On-campus) 32

  1. Electric Circuits with Exercises

    2020

  2. Data processing and analysis excerise

    2020

  3. 実世界データ処理学

    2019

  4. Data processing and analysis excerise

    2019

  5. 電気回路論演習

    2019

  6. Space information engineering

    2019

  7. 企業・研究所見学B

    2019

  8. Data processing and analysis excerise

    2018

  9. 電気回路論演習

    2018

  10. 電気回路論演習

    2017

  11. Data processing and analysis excerise

    2017

  12. 電気回路論演習

    2016

  13. データ解析処理論演習

    2016

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  14. 電気回路論演習

    2015

  15. データ解析処理論演習

    2015

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  16. 電気回路論演習

    2014

  17. データ解析処理論演習

    2014

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  18. 電気回路論演習

    2013

  19. データ解析処理論演習

    2013

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  20. 電気回路論演習

    2012

  21. データ解析処理論演習

    2012

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  22. データ解析処理論演習

    2011

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  23. 電気回路論演習

    2011

  24. データ解析処理論演習

    2010

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  25. 電子情報回路工学演習

    2010

  26. 電子情報回路工学演習

    2009

  27. データ解析処理論演習

    2009

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  28. 電子情報回路工学演習

    2008

  29. データ解析処理論演習

    2008

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  30. データ解析処理論演習

    2007

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

  31. 電子情報回路工学演習

    2007

  32. データ解析処理論演習

    2006

     詳細を見る

    数値解析ソフトScilabの使用法を習得し、人工衛星が観測したデータを解析する

▼display all

 

Social Contribution 3

  1. 平成27年度「京」における高速化ワークショップ

    Role(s):Lecturer

    2015.12

     More details

    Audience: Graduate students, Researchesrs, Scientific, Company

    Type:Seminar, workshop

    宇宙プラズマの第一原理ブラソフコードの性能評価

  2. サイエンティフィック・システム研究会 科学技術計算分科会 2013年度会合「ペタからエクサへの課題」

    Role(s):Lecturer

    サイエンティフィック・システム研究会  2013.10

     More details

    Audience: Teachers, Researchesrs, Scientific, Company, Governmental agency

    Type:Lecture

    京コンピュータを用いた宇宙プラズマの第一原理ブラソフシミュレーション

  3. 公開講座「宇宙」

    Role(s):Lecturer

    2010.8

     More details

    Audience: High school students, College students, Graduate students, Teachers, Guardians, General

    Type:Lecture

    「宇宙科学とコンピュータシミュレーション」と題して、高校生、高専生及び一般向けの公開講座を高知高専において行った。