研究活動
Photo taken in Old Delhi on October 30, 2005.
Biography
Dr. Takayuki Umeda received his Ph.D. from Department of Communications and Computer Engineering at Graduate School of Informatics, Kyoto University in March 2004 under the guidance of Professor Hiroshi Matsumoto and Professor Yoshiharu Omura. Dr. Umeda's Ph.D. thesis included a detailed computer simulation study and numerical techniques for computer simulations, and was entitled "Study on Nonlinear Processes of Electron Beam Instabilities via Computer Simulations." During the doctor course (from April 2001 to March 2004) at Kyoto University, he was awarded the research fellowship for young scientists from the Japan Society for the Promotion of Science (JSPS). Since the completion of his Ph.D., he conducted his post-doctoral research at Institute of Geophysics and Planetary Physics (IGPP), University of California, Los Angeles (UCLA) with Professor Maha Ashour-Abdalla on mission-oriented computer simulations for Cluster spacecraft. In October 2005, Dr. Umeda received Young Scientist Award of the International Union of Radio Science (URSI). In October 2012, Dr. Umeda received Obayashi Award of the Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS) in Japan. He is currently an Assistant Professor at Solar-Terrestrial Environment Laboratory (STEL), Nagoya University. His interest is in computational plasma physics, numerical schemes for computer simulations, plasma waves and instabilities, and geospace science. He is a member of SGEPSS, Japan Geoscience Union (JpGU) and American Geophysical Union (AGU).
Publication List
Umeda, T., Y. Ito, and K. Fukazawa, Global Vlasov simulation on magnetospheres of astronomical objects, Journal of Physics: Conference Series, in press.
Umeda, T., and K. Fukazawa, Performance measurement of parallel Vlasov code for space plasma on various scalar-type supercomputer systems, In: Algorithms and Architectures for Parallel Processing, Lecture Notes in Computer Science, Vol.7439, edited by Y. Xiang, I. Stojmenovic, B. O. Apduhan, G. Wang, K. Nakano, and A. Zomaya, pp.233-240, Springer-Verlag Berlin Heidelberg, 2012. (ISBN: 978-3-642-33077-3) [URL]
Umeda, T., Simulation of collisionless plasma with the Vlasov method, Proceedings of JSST 2012, 258-261, 2012. [URL]
Fukazawa, K., and T. Umeda, Performance measurement of magnetohydrodynamic code for space plasma on the typical scalar type supercomputer systems with the large number of cores, International Journal of High Performance Computing Applications, Vol.26, No.3, 310-318, 2012. [URL]
Umeda, T., S. Matsukiyo, T. Amano, and Y. Miyoshi, A numerical electromagnetic linear dispersion relation for Maxwellian ring-beam velocity distributions, Physics of Plasmas, Vol.19, No.7, 072107 (8pp.), 2012. [URL]
Umeda, T., K. Fukazawa, Y. Nariyuki, and T. Ogino, A scalable full electromagnetic Vlasov solver for cross-scale coupling in space plasma, IEEE Transactions on Plasma Science, Vol.40, No.5, 1421-1428, 2012. [URL]
Umeda, T., Simulation of collisionless plasma with the Vlasov method, In: Computer Physics, edited by B. S. Doherty and A. N. Molloy, pp.315-332, Nova Science-New York, 2012. (ISBN: 978-1-61324-790-7) [URL]
Umeda, T., M. Ashour-Abdalla, J. S. Pickett, and M. L. Goldstein, Vlasov simulation of electrostatic solitary structures in multi-component plasmas, Journal of Geophysical Research, Vol.117, No.A5, A05223 (7pp.), 2012. [URL]
Umeda, T., Y. Kidani, S. Matsukiyo, and R. Yamazaki, Microinstabilities at perpendicular collisionless shocks: A comparison of full particle simulations with different ion to electron mass ratio, Physics of Plasmas, Vol.19, No.4, 042109 (9pp.), 2012. [URL]
Umeda, T., Y. Kidani, S. Matsukiyo, and R. Yamazaki, Modified two-stream instability at perpendicular collisionless shocks: Full particle simulations, Journal of Geophysical Research, Vol.117, No.A03, A03206 (11pp.), 2012. [URL]
Umeda, T., Effect of ion cyclotron motion on the structure of wakes: A Vlasov simulation, Earth, Planets and Space, Vol.64, No.2, pp.231-236, 2012. [URL]
Umeda, T., Y. Nariyuki, and D. Kariya, A non-oscillatory and conservative semi-Lagrangian scheme with fourth-degree polynomial interpolation for solving the Vlasov equation, Computer Physics Communications, Vol.183, No.5, pp.1094-1100, 2012. [URL]
Matsukiyo, S., Y. Ohira, R. Yamazaki, and T. Umeda, Relativistic electron shock drift acceleration in low Mach number galaxy cluster shocks, Astrophysical Journal, Vol.742, No.1, 47 (9pp.), 2011. [URL]
Umeda, T., Y. Matsumoto, T. K. M. Nakamura, K. Fukazawa, and T. Ogino, Vlasov code simulation of cross-scale coupling in space plasmas, In: Numerical Modeling of Space Plasma Flows: ASTRONUM-2010, ASP Conference Series, Vol.444, edited by N. V. Pogorelov, E. Audit, and G. P. Zank, pp.182-187, Astronomical Society of the Pacific-San Francisco, 2011. (ISBN: 978-1-58381-768-1) [URL]
Saito, S., and T. Umeda, Suppression of reflected electrons by kinetic Alfven turbulence in a quasi-perpendicular shock: Particle-in-cell simulations, Astrophysical Journal, Vol.736, No.1, 35 (6pp.), 2011. [URL]
Pavan, J., P. H. Yoon, and T. Umeda, Quasilinear theory and simulation of Buneman instability, Physics of Plasmas, Vol.18, No.4, 042307 (6pp.), 2011. [URL]
Nariyuki, Y., T. Umeda, T. Kumashiro, and T. Hada, Nonlinear evolution of parallel propagating Alfven waves: Vlasov-MHD simulation, Planetary and Space Science, Vol.59, No.8, pp.767-771, 2011. [URL]
Umeda, T., M. Yamao, and R. Yamazaki, Cross-scale coupling at a perpendicular collisionless shock, Planetary and Space Science, Vol.59, No.7, pp.449-455, 2011. [URL]
Umeda, T., Electromagnetic waves in plasma, In: Wave Propagation, edited by A. Petrin, pp.311-330, InTech-Rijeka, 2011. (ISBN: 978-953-307-275-3) [URL]
Amano, T., K. Seki, Y. Miyoshi, T. Umeda, Y. Matsumoto, Y. Ebihara, and S. Saito, Self-consistent kinetic numerical simulation model for ring current particles in the Earth's inner magnetosphere, Journal of Geophysical Research, Vol.116, No.A2, A02216 (15pp.), 2011. [URL]
Umeda, T., T. Kimura, K. Togano, K. Fukazawa, Y. Matsumoto, T. Miyoshi, N. Terada, T. K. M. Nakamura, and T. Ogino, Vlasov simulation on the interaction between solar wind and a dielectric body, Physics of Plasmas, Vol.18, No.1, 012908 (7pp.), 2011. [URL]
Jain, N., T. Umeda, and P. H. Yoon, Modeling nonlinear development of Buneman instability with linear dispersion theory, Plasma Physics and Controlled Fusion, Vol.53, No.2, 025010 (11pp.), 2011. [URL]
Yoon, P. H., and T. Umeda, Nonlinear turbulence theory and simulation of Buneman instability, Physics of Plasmas, Vol.17, No.11, 112317 (7pp.), 2010. [URL]
Umeda, T., Y. Kidani, M. Yamao, S. Matsukiyo, and R. Yamazaki, On the reformation at quasi- and exactly perpendicular shocks: Full particle-in-cell simulations, Journal of Geophysical Research, Vol.115, No.A10, A10250 (7pp.), 2010. [URL]
Matsumoto. Y., N. Terada, T. Miyoshi, K. Fukazawa, T. Umeda, T. Ogino, and K. Seki, Comparative study of global MHD simulations of the terrestrial magnetosphere with different numerical schemes, IEEE Transactions on Plasma Science, Vol.38, No.9, pp.2229-2235, 2010. [URL]
Miyoshi, T., N. Terada, Y. Matsumoto, K. Fukazawa, T. Umeda, and K. Kusano, The HLLD approximate Riemann solver for magnetospheric simulation, IEEE Transactions on Plasma Science, Vol.38, No.9, pp.2236-2242, 2010. [URL]
Fukazawa, K., T. Umeda, T. Miyoshi, N. Terada, Y. Matsumoto, and T. Ogino, Performance measurement of magneto-hydro-dynamic code for space plasma on the various scalar type supercomputer systems, IEEE Transactions on Plasma Science, Vol.38, No.9, pp.2254-2259, 2010. [URL]
Nariyuki, Y., and T. Umeda, On the nonlinearity of the Langmuir turbulence excited by a weak electron beam-plasma interaction, Physics of Plasmas, Vol.17, No.5, 054506 (4pp.), 2010. [URL]
Umeda, T., J. Miwa, Y. Matsumoto, T. K. M. Nakamura, K. Togano, K. Fukazawa, and I. Shinohara, Full electromagnetic Vlasov code simulation of the Kelvin-Helmholtz instability, Physics of Plasmas, Vol.17, No.5, 052311 (10pp.), 2010. [URL]
Umeda, T., K. Togano, and T. Ogino, Structures of diffusion regions in collisionless magnetic reconnection, Physics of Plasmas, Vol.17, No.5, 052103 (6pp.), 2010. [URL]
Umeda, T., Electromagnetic plasma emission during beam-plasma interaction: Parametric decay versus induced scattering, Journal of Geophysical Research, Vol.115, No.A1, A01204 (6pp.), 2010. [URL]
Kumashiro, T., T. Hada, Y. Nariyuki, and T. Umeda, Vlasov simulation of finite amplitude magnetohydrodynamic waves in the solar wind: Development of Vlasov-Hall-MHD code, Journal of Plasma and Fusion Research SERIES, Vol.8, pp.0831-0836, 2009. [URL] [PDF]
Tanaka, S., T. Umeda, Y. Matsumoto, T. Miyoshi, and T. Ogino, Implementation of non-oscillatory and conservative scheme into magnetohydrodynamic equations, Earth, Planets and Space, Vol.61, No.7, pp.895-903, 2009. [URL]
Bosqued, J. M., M. Ashour-Abdalla, T. Umeda, M. El Alaoui, V. Peroomian, H. U. Frey, A. Marchaudon, and H. Laakso, Cluster observations and numerical modeling of energy-dispersed Ionospheric H+ ions bouncing at the PSBL, Journal of Geophysical Research, Vol.114, No.A4, A04216 (28pp.), 2009. [URL]
Umeda, T., M. Yamao, and R. Yamazaki, Electron acceleration at a low-Mach-number perpendicular collisionless shock, Astrophysical Journal, Vol.695, No.1, pp.574-579, 2009. [URL]
Umeda, T., K. Togano, and T. Ogino, Two-dimensional full-electromagnetic Vlasov code with conservative scheme and its application to magnetic reconnection, Computer Physics Communications, Vol.180, No.3, pp.365-374, 2009. [URL]
Umeda, T., and T. Ito, Vlasov simulation of Langmuir decay instability, Physics of Plasmas, Vol.15, No.8, 084503 (4pp.), 2008. [URL]
Umeda, T., A conservative and non-oscillatory scheme for Vlasov code simulations, Earth, Planets and Space, Vol.60, No.7, pp.773-779, 2008. [URL]
Umeda, T., M. Yamao, and R. Yamazaki, Two-dimensional full particle simulation of a perpendicular collisionless shock with a shock-rest-frame model, Astrophysical Journal Letters, Vol.681, No.2, pp.L85-L88, 2008. [URL]
Umeda, T., Generation of low-frequency electrostatic and electromagnetic waves as nonlinear consequences of beam-plasma interactions, Physics of Plasmas, Vol.15, No.6, 064502 (4pp.), 2008. [URL]
Ashour-Abdalla, M., J. M. Bosqued, M. El Alaoui, V. Peroomian, T. Umeda, and R. J. Walker, Modeling PSBL high speed ion beams observed by Cluster and Double Star, Advances in Space Research, Vol.41, No.10, pp.1598-1610, 2008. [URL]
Umeda, T., Numerical study of electrostatic electron cyclotron harmonic wave due to Maxwellian ring velocity distributions, Earth, Planets and Space, Vol.59, No.11, pp.1205-1210, 2007. [URL]
Tanaka, S., T. Ogino, and T. Umeda, Parametric decay of Alfven waves, Journal of Geophysical Research, Vol. 112, No. A10, A10110 (7pp.), 2007. [URL]
Umeda, T., Vlasov simulation of Langmuir wave packets, Nonlinear Processes in Geophysics, Vol.14, No.5, pp.671-679, 2007. [URL]
Ryu, C.-M., T. Rhee, T. Umeda, P. H. Yoon, and Y. Omura, Turbulent acceleration of superthermal electrons, Physics of Plasmas, Vol.14, No.10, 100701 (4pp.), 2007. [URL]
Umeda, T., M. Ashour-Abdalla, D. Schriver, R. L. Richard, and F. V. Coroniti, Particle-in-cell simulation of Maxwellian ring velocity distribution, Journal of Geophysical Research, Vol.112, No.A4, A04212 (8pp.), 2007. [URL]
Umeda, T., M. Ashour-Abdalla, and D. Schriver, Comparison of numerical interpolation schemes for one-dimensional electrostatic Vlasov code, Journal of Plasma Physics, Vol.72, No.6, pp.1057-1060, 2006. [URL] [PDF]
Umeda, T., and R. Yamazaki, Particle simulation of a perpendicular collisionless shock: A shock-rest-frame model, Earth, Planets and Space, Vol.58, No.10, e41-e44, 2006. [URL] [PDF]
Umeda, T., Y. Omura, T. Miyake, H. Matsumoto, and M. Ashour-Abdalla, Nonlinear evolution of the electron two-stream instability: Two-dimensional particle simulations, Journal of Geophysical Research, Vol.111, No.10, A10206 (9pp.), 2006. [URL]
Umeda, T., Vlasov simulation of amplitude-modulated Langmuir waves, Physics of Plasmas, Vol.13, No.9, 092304 (5pp.), 2006. [URL]
Bosqued, J. M., M. Ashour-Abdalla, A. Marchaudon, H. Laakso, T. Umeda, M. El Alaoui, V. Peroomian, H. Reme, G. Paschmann, M. Dunlop, and A. Fazakerley, Cluster observations of energetic ionospheric ion beams in the auroral region: Acceleration and associated energy-dispersed precipitation, Geophysical Research Letters, Vol.33, No.12, L12102 (4pp.), 2006. [URL]
Umeda, T., Y. Omura, and H. Matsumoto, Two-dimensional particle simulation of electromagnetic field signature associated with electrostatic solitary waves, Journal of Geophysical Research, Vol.109, No.A2, A02207 (10pp.), 2004. [URL]
Umeda, T., Y. Omura, T. Tominaga, and H. Matsumoto, A new charge conservation method in electromagnetic particle-in-cell simulations, Computer Physics Communications, Vol.156, No.1, pp.73-85, 2003. [URL]
Omura, Y., T. Umeda, and H. Matsumoto, Simulation of electron beam instabilities and nonlinear potential structures, In: Space Plasma Simulation, Lecture Notes in Physics, Volume 615, edited by J. Buchner, C. T. Dum, and M. Scholer, pp.79-92, Springer-Verlag Berlin Heidelberg New York, 2003. (ISBN: 978-354-000-698-2) [URL]
Omura, Y., W. J. Heikkila, T. Umeda, K. Ninomiya, and H. Matsumoto, Particle simulation of plasma response to an applied electric field parallel to magnetic field lines, Journal of Geophysical Research, Vol.108, No.A5, 1197 (7pp.), 2003. [URL]
Yoon, P. H., R. Gaelzer, T. Umeda, Y. Omura, and H. Matsumoto, Harmonic Langmuir waves. I. Nonlinear dispersion relation, Physics of Plasmas, Vol.10, No.2, pp.364-372, 2003. [URL]
Gaelzer, R., P. H. Yoon, T. Umeda, Y. Omura, and H. Matsumoto, Harmonic Langmuir waves. II. Turbulence spectrum, Physics of Plasmas, Vol.10, No.2, pp.373-381, 2003. [URL]
Umeda, T., Y. Omura, P. H. Yoon, R. Gaelzer, and H. Matsumoto, Harmonic Langmuir waves. III. Vlasov simulation, Physics of Plasmas, Vol.10, No.2, pp.382-391, 2003. [URL]
Umeda, T., Y. Omura, H. Matsumoto, and H. Usui, Formation of electrostatic solitary waves in space plasmas: Particle simulations with open boundary conditions, Journal of Geophysical Research, Vol.107, No.A12, 1449 (16pp.), 2002. [URL]
Umeda, T., Y. Omura, and H. Matsumoto, An improved masking method for absorbing boundaries in electromagnetic particle simulations, Computer Physics Communications, Vol.137, No.2, pp.286-299, 2001. [URL]
Omura, Y., H. Kojima, T. Umeda, and H. Matsumoto, Observational evidence of dissipative small scale processes: Geotail spacecraft observation and simulation of electrostatic solitary waves, Astrophysics and Space Science, Vol.277, No.1, pp.45-57, 2001. [URL]