1. The Electrical and Electronic Engineering Program Faculty of Engineering University of Miyazaki 1‐1 Gakuen Kibanadai‐nishi Miyazaki 889‐2192 Japan
2. Yokohama Battery Science Corporation 3‐21‐11 Nakagawa‐cho Yokohama‐shi Kanagawa 241‐0814 Japan
3. Tosoh Corporation 2743‐1, Hayakawa Ayase‐shi Kanagawa 252‐1123 Japan
4. Tosoh Finechem Corporation 4555 Kaisei‐cho Shunan‐shi Yamaguchi 746‐0006 Japan