1. Associate Professor, Geotechnical Research Center, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore 639798.
2. Associate Professor and Director, Geotechnical Research Center, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore 639798.
3. Assistant Manager, Dept. of Geotechnical and Tunnels, Land Transport Authority, Singapore 219428.