1. Assoc. Prof., Dept. of Constr. Engrg., Yunlin Univ. of Sci. and Technol., Touliu, Taiwan 640.
2. Assoc. Prof., Dept. of Civ. Engrg., Univ. of Hong Kong, Pokfulam Rd., Hong Kong, China.
3. Prof. and Dean, Coll. of Engrg., Univ. of Hawaii, Honolulu, HI 96822.