Yoshiharu Omura

Learn More
This paper proposes a new method for Particle-in-Cell (PIC) simulations which aims at achieving both good load balancing and scalability so as to be efficiently executed on distributed memory systems. This method, named <i>OhHelp</i>, simply and equally partitions the space domain where charged particles reside and assigns each partitioned subdomain to each(More)
A decomposition scheme was applied to ALOS/PALSAR data obtained from a fast-growing tree plantation in Sumatra, Indonesia to extract tree stem information and then estimate the forest stand volume. The scattering power decomposition of the polarimetric SAR data was performed both with and without a rotation matrix and compared to the following(More)
MEFISTO, together with the companion instrument WPT, are planning the first-ever in situ measurements of the electric field in the magnetosphere of planet Mercury. The instruments have been selected by JAXA for inclusion in the BepiColombo/MMO pay-load, as part of the Plasma Wave Investigation coordinated by Kyoto University. The magnetosphere of Mercury(More)
We propose a distributed upconverter with composite right/left handed (CRLH) transmission lines (TLs) and its design method. An upconverter MMIC is fabricated by using this design method. The upconverter shows frequency dividing operation by setting RF, LO, and IF frequencies, and achieves image rejection features without image rejection filters or blocks.(More)
Akebono The characteristics of wire antennas in space plasma are necessary to determine the absolute intensity and the phase of the electric field waves, because the observation data are given by voltage signals. One of the important characteristics of wire antennas is the antenna impedance. Determination of the impedance can be especially difficult since(More)
In order to evaluate the spacecraft-plasma interactions quantitatively, we have been developing "Geospace Environment Simulator (GES)". A proto model of GES called NuSPACE is an electromagnetic Particle-In-Cell (PIC) simulation code and has been optimized to achieve the high performance with the Earth simulator. To test NuSPACE, we examined the space(More)
  • 1