1. Nagaoka University of Technology,Nagaoka City, Niigata,Japan
2. Sizuoka University,Nakaku, Hamamatsu City, Shizuoka,Japan
3. Tohoku Electric Power Co., Inc.,Aoba-ku, Sendai, Miyagi,Japan
4. GS Yuasa International Ltd.,Simo-Akasaka, Kawagoe City, Saitama,Japan