1. Department of Electrical, Electronic and Computer Engineering, Gifu University, Gifu 501-1193, Japan
2. Department of Physics, Graduate School of Engineering, Yokohama National University, Yokohama 240-8501, Japan
3. Dassault Systèmes BIOVIA K.K., ThinkPark Tower, 2-1-1 Osaki, Shinagawa-ku, Tokyo 141-6020, Japan