1. Postdoctoral Associate, Dept. of Civil and Environmental Engineering, Univ. of Michigan, Ann Arbor, MI.
2. Assistant Professor, Dept. of Civil Engineering, Yeungnam Univ., 214-1 Dae-Dong Gyeongsan-Si, Gyeongsangbuk-Do 712-749, Korea (corresponding author).
3. A.J. Clark Chair Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742-3021.