1. Department of High Energy Engineering Science, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816
2. Ube Industries Ltd., 1978-5 Kogushi, Ube, Yamaguchi 755
3. Central Research Laboratory, Mitsubishi Electric Corporation, Tsukaguchi-Honmachi 8, Amagasaki, Hyogo 661