1. Fellow, ASCE
2. Asst. Prof., Dept. of Industrial Engrg., Yuan Ze Univ., 135 Yuan-Tung Rd., Chung-Li, Taoyuan, Taiwan 320, PRC. E-mail: ietingcj@saturn.yzu.edu.tw
3. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Maryland, College Park, MD 20742. E-mail: pschon@eng.umd.edu