1. Assistant Professor, Division of Environmental and Water Resources, School of Civil and Environmental Engineering, N1 #1A-29, Nanyang Technological Univ., Nanyang Ave., Singapore 639798.
2. Head and Professor, Division of Environmental and Water Resources, School of Civil and Environmental Engineering, N1 #1A-29, Nanyang Technological Univ., Nanyang Ave., Singapore 639798.
3. Associate Professor, Division of Geotechnical and Transportation Engineering, School of Civil and Environmental Engineering, N1 #1A-29, Nanyang Technological Univ., Nanyang Ave., Singapore 639798.