1. Professor, Division of Built Environment, Graduate School of Engineering, Hokkaido Univ., Kita-ku, Kita 13, Nishi 8, Sapporo 060-8628, Japan.
2. Lecturer, Dept. of Civil Engineering, Faculty of Engineering, Syiah Kuala Univ., Darussalam, Banda Aceh 23111, Indonesia.
3. Assistant Professor, Division of Civil Engineering, Univ. of Tokyo, Bunkyo-ku, Hongo 7-3-1, Tokyo 113-8656, Japan.
4. Associate Professor, Division of Built Environment, Graduate School of Engineering, Hokkaido Univ., Kita-ku, Kita 13, Nishi 8, Sapporo 060-8628, Japan.
5. Associate Professor, State Key Laboratory of Coastal and Offshore Engineering, Dalian Univ. of Technology, Dalian 116024, China.