1. Nippondenso Company, Limited, Engineering Computing Department, 1‐1, Showa‐cho, Kariyashi, Aichi 448, Japan
2. Nippondenso Company, Limited, Production Engineering Department, 1‐1, Showa‐cho, Kariyashi, Aichi 448, Japan
3. Kyushu University, Institute of Advanced Material Study, Kasuga‐koen 6‐1, Fukuoka 816, Japan