1. Research Fellow, Dept. of Civil Engineering, National Univ. of Singapore, 10 Kent Ridge Crescent, Republic of Singapore, 119260.
2. Professor, Dept. of Civil Engineering, National Univ. of Singapore, 10 Kent Ridge Crescent, Republic of Singapore, 119260.
3. Associate Professor, Dept. of Civil Engineering, National Univ. of Singapore, 10 Kent Ridge Crescent, Republic of Singapore, 119260.