1. Associate Member, ASCE
2. Member, ASCE
3. Asst. Prof., School of Civ. and Envir. Engrg., Georgia Inst. of Technol., Atlanta, GA 30332-0355.
4. T. Y. and Margaret Lin Prof., Dept. of Civ. and Envir. Engrg., Univ. of California, Berkeley, Berkeley, CA 94720-1710.