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.