1. Prof., Civ. Engrg. Dept., Kanazawa Inst. of Technology, 7-1, Ogigaoka, Nonoichimachi, Ishikawa Pref. 921-8812, Japan.
2. Engr., Toyota Motor Co., Ltd. Toyota City, Aichi Pref. 471-0000, Japan; formerly, Grad. Student, Civ. Engrg. Dept., Kanazawa Inst. of Technol., 7-1, Ogigaoka, Nonoichimachi, Ishikawa Pref., Japan.