1. a Department of Control Engineering, Faculty of Engineering Science , Osaka University , Machikaneyama, Toyonaka-shi , 560
2. b Institute of Materials Science, University of Tsukuba , Tennoudai, Tsukuba-shi , 305
3. d Department of Applied Mathematics, Faculty of Engineering , Gifu University , Yanagido, Gifu-shi , 501-11
4. e Department of Nuclear Engineering , Tohoku University , Aoba, Sendai-shi , 980
5. f Department of Nuclear Engineering , Kyoto University , Yoshidahonmachi, Sakyo-ku, Kyoto-shi , 606
6. g Nuclear Engineering Department, NAIG Nuclear Research Laboratory , Ukishimacho, Kawasaki-ku, Kawasaki-shi , 210