72 citations · 188 across the 12 of their papers we have counts for
12 papers
Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks
Ryo Yamazaki, Ayato Shinoda, Takayuki Umeda +1
Ion temperature anisotropy is a common feature for (quasi-)perpendicular collisionless shocks. By using two-dimensional full particle simulations, it is shown, that the ion tempera…
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
T. Umeda, R. Yamazaki, Y. Ohira +12
A preliminary numerical experiment is conducted for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers by using one-dimensional part…
On the Boris solver in particle-in-cell simulation
Seiji Zenitani, Takayuki Umeda
A simple form of the Boris solver in particle-in-cell (PIC) simulation is proposed. It employs an exact solution of the Lorentz-force part, and it is equivalent to the Boris solver…
End-to-end learning potentials for structured attribute prediction
Kota Yamaguchi, Takayuki Okatani, Takayuki Umeda +2
We present a structured inference approach in deep neural networks for multiple attribute prediction. In attribute prediction, a common approach is to learn independent classifiers…
Automatic Attribute Discovery with Neural Activations
Sirion Vittayakorn, Takayuki Umeda, Kazuhiko Murasaki +3
How can a machine learn to recognize visual attributes emerging out of online community without a definitive supervised dataset? This paper proposes an automatic approach to discov…
Some remarks on the diffusion regions in magnetic reconnection
Seiji Zenitani, Takayuki Umeda
The structure of the diffusion regions in antiparallel magnetic reconnection is investigated by means of a theory and a Vlasov simulation. The magnetic diffusion is considered as r…