1. Assoc. Prof., Div. of Chem., School of Sci., Nat. Inst. of Educ., Nanyang Technol. Univ., 469 Bukit Timah Rd., Singapore 259756.
2. Res. Fellow, Div. of Envir. and Water Resour. Engrg., School of Civ. and Struct. Engrg., Nanyang Technol. Univ., Nanyang Ave., Singapore 639798.
3. Prof. and Head, Div. of Water Resour. and Transp., School of Civ. and Struct. Engrg., Nanyang Technol. Univ., Nanyang Ave., Singapore 639798.