1. National Institute of Technology, Oyama College,Advanced Course, General Engineering Program,Oyama,Japan
2. National Astronomical Observatory of Japan,Center for Computational Astrophysics,Mitaka,Japan
3. Chiba University,Graduate School of Engineering,Chiba,Japan
4. National Institute of Technology, Oyama College,Department of Innovative Electrical and Electronic Engineering,Oyama,Japan
5. University of Tsukuba,Graduate School of Science and Tecnology,Tsukuba,Japan