1. Frontier Technology Department Research & Development Division Shiga Technical Center Daihatsu Motor Co., LTD. 3000 Yamanoue, Ryuo, Gamo, Shiga Japan
2. Nagaoka University of Technology 1603–1 Kamitomioka Nagaoka, Niigata Japan
3. Japan Atomic Energy Agency 1‐1‐1 Kouto Sayo Hyogo Japan