1. Interdisciplinary Graduate School of Engineering Science, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
2. Japan Atomic Energy Agency, Tokai-mura 319-11, Ibaraki 319-1195, Japan
3. Shimizu Corporation, No.2-3, Shibaura1-chome, Minato-ku, Tokyo 105-8007, Japan