1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, Los Angeles, CA 90095-1598.
2. Technical Manager, CECI Engineering Consultants, Inc., Taipei, Taiwan.
3. Professor, Dept. of Environmental and Safety Engineering, National Yunlin Univ., Yunlin, Taiwan.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, Los Angeles, CA 90095-1598 (corresponding author).