1. Lecturer, Dept. of Civil Engineering, Faculty of Engineering, Syiah Kuala Univ., Kopelma Darussalam, Banda Aceh 23111, Indonesia.
2. Professor, Division of Built Environment, Graduate School of Engineering, Hokkaido Univ., Kita ku, Kita 13, Nishi 8, Sapporo 060-8628, Japan.
3. Associate Professor, Division of Built Environment, Graduate School of Engineering, Hokkaido Univ., Kita ku, Kita 13, Nishi 8, Sapporo 060-8628, Japan.