1. Senior Geotechnical Engineer, Coffey Geotechnics Pty Ltd., 8/12 Mars Rd., Lane Cove West, NSW 2066, Australia.
2. Assistant Professor, Dept. of Civil Engineering, National Univ. of Singapore, Block E1A, #07-03, 1 Engineering Dr. 2, Singapore 117576.
3. Associate Professor, Dept. of Civil Engineering, National Univ. of Singapore, Block E1A, #07-03, 1 Engineering Dr. 2, Singapore 117576.