1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Hawaii at Manoa, Honolulu, HI 96822 (corresponding author).
2. Research Assistant, Dept. of Mechanical and Environmental Engineering, Univ. of California, Santa Barbara, CA 93106.
3. Visiting Professor, Dept. of Civil and Environmental Engineering, Univ. of Hawaii at Manoa, Honolulu, HI 96822.
4. Professor, Dept. of Mechanical and Environmental Engineering, Univ. of California, Santa Barbara, CA 93106.