1. Senior Engineer, MWH Americas, Inc., 3321 Power Inn Rd., Ste. 300, Sacramento, CA 95826. E-mail: mingyen_tu@hotmail.com
2. Associate Professor, Dept. of Civil Engineering, National Taiwan Univ., Taipei, Taiwan, ROC. E-mail: nsshue@ntu.edu.tw
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803. E-mail: ftsai@lsu.edu
4. Distinguished Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, CA 90095. E-mail: williamy@seas.ucla.edu