1. Senior Engineer, China Construction (SP) Development Co. Pte Ltd., 10 Hoe-Ching Rd., Keppel Towers #27-02, Singapore 089315.
2. Principal Consultant, Mitic Associates, 101 Cashew Rd. #07-02, Singapore 679672.
3. Associate Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Block N1, Singapore 639798 (corresponding author).