

Photo taken at IAGA 2009 in Sopron on August 25, 2009. 

Photo taken in Old Delhi on October 30, 2005. 
Photo taken at Tanabata Beer Festa in Toyama on July 2, 2011. 
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
numerical techniques for computer simulations and
computer simulation study on beamplasma interactions,
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 a research fellowship
for young scientists from the Japan Society for
the Promotion of Science (JSPS).
After the completion of his Ph.D.,
he conducted his postdoctoral research at
Institute of Geophysics and Planetary Physics (IGPP),
University of California, Los Angeles (UCLA) from April 2004 to March 2006,
with Professor Maha AshourAbdalla on
missionoriented computer simulations for Cluster spacecraft.
From, April 2006 to July 2015, he was an Assistant Professor at
SolarTerrestrial Environment Laboratory (STEL), Nagoya University.
Dr. Umeda received Young Scientist Award
of the International Union of Radio Science (URSI) in October 2005,
Obayashi Early Career Scientist Award
of the Society of Geomagnetism and Earth, Planetary and
Space Sciences (SGEPSS) in Japan in October 2012, and
Young Scientists' Prize of the Commendation for Science and Technology by
the Minister of Education, Culture, Sports, Science and Technology (MEXT)
in Japan in April 2015.
He is currently a Lecturer/Associate Professor at
Institute for SpaceEarth Enviromental Research (ISEE), Nagoya University.
His interest is in highperformance computing and
its application to plasma science and space science.
He is a member of SGEPSS, Japan Geoscience Union (JpGU)
and American Geophysical Union (AGU).
Publication List
Umeda, T.,
A threestep Boris integrator for Lorentz force equation of charged particles,
Computer Physics Communications, in press
[URL]
K. Fukazawa, T. Soga, T. Umeda, and T. Nanri,
Performance Evaluation and Optimization of MagnetoHydroDynamic Simulation
for Planetary Magnetosphere with Xeon Phi KNL,
Advances in Parallel Computing, Vol.32,
Edited by S. Bassini, M. Danelutto, P. Dazzi, G. R. Joubert, and F. Peters,
pp.178187,
IOS PressAmsterdam Berlin Tokyo Washington DC, 2018.
(ISBN: 9781614998426)
[URL]
Umeda, T., and K. Fukazawa,
Performance measurement of Eulerian kinetic code on the Xeon Phi KNL,
Proceedings of HPC Asia 2018, P1 (4pp.), 2018.
[URL]
Umeda, T., and Y. Wada,
NonMHD effects in the nonlinear development of the MHDscale RayleighTaylor instability,
Physics of Plasmas, Vol.24, No.7, 072307 (10pp.), 2017.
[URL]
Saito, S., Y. Nariyuki, and T. Umeda,
Generation of intermittent ion acoustic waves in whistlermode turbulence,
Physics of Plasmas, Vol.24, No.7, 072304 (7pp.), 2017.
[URL]
Umeda, T., S. Saito, and Y. Nariyuki,
Rapid decay of nonlinear whistler waves in two dimensions: Full particle simulation,
Physics of Plasmas, Vol.24, No.5, 054503 (4pp.), 2017.
[URL]
Umeda, T., and Y. Wada,
Secondary instabilities in the collisionless RayleighTaylor instability: Full kinetic simulation,
Physics of Plasmas, Vol.23, No.11, 112117 (8pp.), 2016.
[URL]
Umeda, T., and K. Fukazawa,
Performance comparison of Eulerian kinetic Vlasov code between flatMPI parallelism and hybrid parallelism on Fujitsu FX100 supercomputer,
Proceedings of the 23rd European MPI Users' Group Meeting, pp.218221, 2016.
[URL]
Nakamura, T. K. M., R. Nakamura, W. Baumjohann,
T. Umeda, and I. Shinohara,
Threedimensional development of front region of plasma jets
generated by magnetic reconnection,
Geophysical Research Letters, Vol.43, No.16, pp.83568364, 2016.
[URL]
Shoji, Y., R. Yamazaki, S. Tomita, Y. Kawamura, Y. Ohira,
S.Tomiya, Y. Sakawa, T. Sano, Y. Hara, S. Kondo, H. Shimogawara,
S. Matsukiyo, T. Morita, K. Tomita, H. Yoneda, K. Nagamine,
Y. Kuramitsu, T. Moritaka, N. Ohnishi, T. Umeda, and H. Takabe,
Toward the Generation of Magnetized Collisionless Shocks with HighPower Lasers,
Plasma and Fusion Research, 11, 3401031 (3pp.), 2016
[URL]
Umeda, T., N. Yamauchi, Y. Wada, and S. Ueno,
Evaluating gyroviscosity in the KelvinHelmholtz instability by kinetic simulations,
Physics of Plasmas, Vol.23, No.5, 054506 (4pp.), 2016.
[URL]
Umeda, T., and K. Fukazawa,
Hybrid parallelization of hyperdimensional Vlasov code with OpenMP loop collapse directive,
In: Parallel Computing: On the Road to Exascale,
Advances in Parallel Computing, Vol.27,
edited by G. R. Joubert, H. Leather, M. Parsons, F. Peters, and M. Sawyer,
pp.265274, IOS PressAmsterdam Berlin Tokyo Washington DC, 2016.
(ISBN: 9781614996200)
[URL]
Umeda, T., and S. Oya,
Performance comparison of parallel sorting with OpenMP,
Proceedings of 2015 Third International Symposium on Computing and Networking (CANDAR),
pp.334340, 2015.
[URL]
Nariyuki, Y., T. Umeda, T. K. Suzuki, and T. Hada,
Note on onefluid modeling of lowfrequency Alfvenic fluctuations in a solar wind plasma with multiion components,
Physics of Plasmas, Vol.22, No.12, 124502 (4pp.), 2015.
[URL]
Saito, S., T. Umeda, and Y. Nariyuki,
Nonlinear damping of a finite amplitude whistler wave due to modified two stream instability,
Physics of Plasmas, Vol.22, No.7, 072105 (7pp.), 2015.
[URL]
Umeda, T., and K. Fukazawa,
A highresolution global Vlasov simulation of a small dielectric body
with a weak intrinsic magnetic field on the K computer,
Earth, Planets and Space, Vol.67, No.1, 49 (8pp.), 2015.
[URL]
Umeda, T., and K. Fukazawa,
Performance tuning of Vlasov code for space plasma on the K computer,
In: AsiaSim 2014,
Communications in Computer and Information Science, Vol.474,
edited by S. Tanaka, K. Hasegawa, X. Rui, and S. J. Turner,
pp.127138, SpringerVerlag Berlin Heidelberg, 2014.
(ISBN: 9783662452882)
[URL]
Umeda, T., S. Saito, and Y. Nariyuki,
Electron acceleration during the decay of nonlinear whistler waves
in lowbeta electronion plasma,
Astrophysical Journal, Vol.794, No.1, 63 (10pp.), 2014.
[URL]
Umeda, T., S. Ueno, and T. K. M. Nakamura,
Ion kinetic effects to nonlinear processes of
the KelvinHelmholtz instability,
Plasma Physics and Controlled Fusion, Vol.56, No.7, 075006 (11pp.), 2014.
[URL]
Umeda, T., and Y. Ito,
Entry of solarwind ions into the wake of a small body
with a magnetic anomaly: A global Vlasov simulation,
Planetary and Space Science,
Vol.9394, pp.3540, 2014.
[URL]
Zenitani, S., and T. Umeda,
Some remarks on the diffusion regions in magnetic reconnection,
Physics of Plasmas, Vol.21, No.3, 034503 (5pp.), 2014.
[URL]
Fukazawa, K., T. Nanri, and T. Umeda,
Performance measurements of MHD simulation for planetary magnetosphere
on Petascale computer FX10,
In: Parallel Computing: Accelerating Computational Science and Engineering,
Advances in Parallel Computing, Vol.25,
edited by M. Bader, A. Bode, H.J. Bungartz, M. Gerndt, G.R. Joubert,
and F. Peters,
pp.387394, IOS PressAmsterdam Berlin Tokyo Washington DC, 2014.
(ISBN: 9781614993810)
[URL]
Nariyuki, Y., T. Umeda, T. K. Suzuki, and T. Hada,
Ion acceleration by parallel propagating nonlinear Alfven wave packets
in a radially expanding plasma,
Nonlinear Processes in Geophysics, Vol.21, No.1, 339346, 2014.
[URL]
Umeda, T., Y. Kidani, S. Matsukiyo, and R. Yamazaki,
Dynamics and microinstabilities at perpendicular collisionless shock:
A comparison of largescale twodimensional full particle simulations
with different ion to electron mass ratio,
Physics of Plasmas, Vol.21, No.2, 022102 (10pp.), 2014.
[URL]
Umeda, T., and K. Fukazawa,
Performance measurement of parallel Vlasov code
for space plasma on scalartype supercomputer systems
with large number of cores,
In: AsiaSim 2013,
Communications in Computer and Information Science, Vol.402
edited by G. Tan, G. K. Yeo, S. J. Turner, and Y. M. Teo,
pp.561569, SpringerVerlag Berlin Heidelberg, 2013.
(ISBN: 9783642450365)
[URL]
Fukazawa, K., T. Nanri, and T. Umeda,
Performance evaluation of magnetohydrodynamics simulation for magnetosphere on K computer,
In: AsiaSim 2013,
Communications in Computer and Information Science, Vol.402
edited by G. Tan, G. K. Yeo, S. J. Turner, and Y. M. Teo,
pp.570576, SpringerVerlag Berlin Heidelberg, 2013.
(ISBN: 9783642450365)
[URL]
Umeda, T., Y. Ito, and K. Fukazawa,
Global Vlasov simulation on magnetospheres of astronomical objects,
Journal of Physics: Conference Series,
Vol.454, 012005 (9pp.), 2013.
[URL]
Nariyuki, Y., S. Saito, and T. Umeda,
A primitive kineticfluid model for
quasiparallel propagating magnetohydrodynamic waves,
Physics of Plasmas,
Vol.20, No.7, 072115 (9pp.), 2013.
[URL]
Umeda, T., and K. Fukazawa,
Performance measurement of parallel Vlasov code for space plasma
on various scalartype 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.233240, SpringerVerlag Berlin Heidelberg, 2012.
(ISBN: 9783642330773)
[URL]
Umeda, T.,
Simulation of collisionless plasma with the Vlasov method,
Proceedings of JSST 2012,
258261, 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, 310318, 2012.
[URL]
Umeda, T., S. Matsukiyo, T. Amano, and Y. Miyoshi,
A numerical electromagnetic linear dispersion relation
for Maxwellian ringbeam 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 crossscale coupling in space plasma,
IEEE Transactions on Plasma Science, Vol.40, No.5, 14211428, 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.315332,
Nova ScienceNew York, 2012.
(ISBN: 9781613247907)
[URL]
Umeda, T., M. AshourAbdalla, J. S. Pickett, and M. L. Goldstein,
Vlasov simulation of electrostatic solitary structures
in multicomponent 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 twostream 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.231236, 2012.
[URL]
Umeda, T., Y. Nariyuki, and D. Kariya,
A nonoscillatory and conservative semiLagrangian scheme
with fourthdegree polynomial interpolation
for solving the Vlasov equation,
Computer Physics Communications,
Vol.183, No.5, pp.10941100, 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 crossscale coupling in space plasmas,
In: Numerical Modeling of Space Plasma Flows: ASTRONUM2010,
ASP Conference Series, Vol.444,
edited by N. V. Pogorelov, E. Audit, and G. P. Zank, pp.182187,
Astronomical Society of the PacificSan Francisco, 2011.
(ISBN: 9781583817681)
[URL]
Saito, S., and T. Umeda,
Suppression of reflected electrons by kinetic Alfven turbulence
in a quasiperpendicular shock: Particleincell 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:
VlasovMHD simulation,
Planetary and Space Science, Vol.59, No.8, pp.767771, 2011.
[URL]
Umeda, T., M. Yamao, and R. Yamazaki,
Crossscale coupling at a perpendicular collisionless shock,
Planetary and Space Science, Vol.59, No.7, pp.449455, 2011.
[URL]
Umeda, T.,
Electromagnetic waves in plasma,
In: Wave Propagation,
edited by A. Petrin,
pp.311330,
InTechRijeka, 2011.
(ISBN: 9789533072753)
[URL]
Amano, T., K. Seki, Y. Miyoshi, T. Umeda,
Y. Matsumoto, Y. Ebihara, and S. Saito,
Selfconsistent 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 particleincell 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.22292235, 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.22362242, 2010.
[URL]
Fukazawa, K., T. Umeda, T. Miyoshi, N. Terada,
Y. Matsumoto, and T. Ogino,
Performance measurement of magnetohydrodynamic code for space plasma
on the various scalar type supercomputer systems,
IEEE Transactions on Plasma Science, Vol.38, No.9, pp.22542259, 2010.
[URL]
Nariyuki, Y., and T. Umeda,
On the nonlinearity of the Langmuir turbulence
excited by a weak electron beamplasma 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 KelvinHelmholtz 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 beamplasma 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 VlasovHallMHD code,
Journal of Plasma and Fusion Research SERIES, Vol.8, pp.08310836, 2009.
[URL]
[PDF]
Tanaka, S., T. Umeda, Y. Matsumoto, T. Miyoshi, and T. Ogino,
Implementation of nonoscillatory and conservative scheme
into magnetohydrodynamic equations,
Earth, Planets and Space,
Vol.61, No.7, pp.895903, 2009.
[URL]
Bosqued, J. M., M. AshourAbdalla, T. Umeda, M. El Alaoui,
V. Peroomian, H. U. Frey, A. Marchaudon, and H. Laakso,
Cluster observations and numerical modeling of
energydispersed 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 lowMachnumber perpendicular collisionless shock,
Astrophysical Journal,
Vol.695, No.1, pp.574579, 2009.
[URL]
Umeda, T., K. Togano, and T. Ogino,
Twodimensional fullelectromagnetic Vlasov code with conservative scheme
and its application to magnetic reconnection,
Computer Physics Communications, Vol.180, No.3, pp.365374, 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 nonoscillatory scheme for Vlasov code simulations,
Earth, Planets and Space,
Vol.60, No.7, pp.773779, 2008.
[URL]
Umeda, T., M. Yamao, and R. Yamazaki,
Twodimensional full particle simulation of
a perpendicular collisionless shock with a shockrestframe model,
Astrophysical Journal Letters,
Vol.681, No.2, pp.L85L88, 2008.
[URL]
Umeda, T.,
Generation of lowfrequency electrostatic and electromagnetic waves
as nonlinear consequences of beamplasma interactions,
Physics of Plasmas, Vol.15, No.6, 064502 (4pp.), 2008.
[URL]
AshourAbdalla, 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.15981610, 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.12051210, 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.671679, 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. AshourAbdalla, D. Schriver, R. L. Richard,
and F. V. Coroniti,
Particleincell simulation of Maxwellian ring velocity distribution,
Journal of Geophysical Research,
Vol.112, No.A4, A04212 (8pp.), 2007.
[URL]
Umeda, T., M. AshourAbdalla, and D. Schriver,
Comparison of numerical interpolation schemes
for onedimensional electrostatic Vlasov code,
Journal of Plasma Physics,
Vol.72, No.6, pp.10571060, 2006.
[URL]
[PDF]
Umeda, T., and R. Yamazaki,
Full particle simulation of a perpendicular collisionless shock:
A shockrestframe model,
Earth, Planets and Space,
Vol.58, No.10, e41e44, 2006.
[URL]
[PDF]
Umeda, T., Y. Omura, T. Miyake, H. Matsumoto, and M. AshourAbdalla,
Nonlinear evolution of the electron twostream instability:
Twodimensional particle simulations,
Journal of Geophysical Research,
Vol.111, No.10, A10206 (9pp.), 2006.
[URL]
Umeda, T.,
Vlasov simulation of amplitudemodulated Langmuir waves,
Physics of Plasmas, Vol.13, No.9, 092304 (5pp.), 2006.
[URL]
Bosqued, J. M., M. AshourAbdalla, 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 energydispersed precipitation,
Geophysical Research Letters,
Vol.33, No.12, L12102 (4pp.), 2006.
[URL]
Umeda, T., Y. Omura, and H. Matsumoto,
Twodimensional 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 particleincell simulations,
Computer Physics Communications,
Vol.156, No.1, pp.7385, 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.7992,
SpringerVerlag Berlin Heidelberg New York, 2003.
(ISBN: 9783540006982)
[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.364372, 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.373381, 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.382391, 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.286299, 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.4557, 2001.
[URL]



Young Scientist Award of the International Union of Radio Science (URSI) (2005). 
Obayashi Early Career Scientist Award of the Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS) in Japan (2012). 
Young Scientists' Prize of the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology (MEXT) in Japan (2015). 
