1. Assistant Professor, Civil Engineering Dept., Aswan Faculty of Engineering, South Valley Univ., Aswan, Egypt; formerly, Ph.D. Candidate, Div. of Built Environment, Hokkaido Univ., Sapporo 060-8628, Japan (corresponding author).
2. Associate Professor, Div. of Built Environment, Hokkaido Univ., Sapporo 060-8628, Japan.