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