1. Assistant Professor, Dept. of Civil and Environmental Engineering, South Dakota State Univ., Brookings, SD 57007.
2. Assistant Professor and Head of Center, Dept. of Civil and Environmental Engineering, Incheon Disaster Prevention Research Center, Incheon National Univ., 12-1 Songdo-dong, Incheon 406-840, South Korea (corresponding author).
3. Assistant Professor, Dept. of Civil Engineering, Korea Maritime and Ocean Univ., Busan 606-791, South Korea.