1. Assistant Professor, Dept. of Civil and Environmental Engineering, Myongji Univ., Cheoin-gu, Yongin, Gyeonggi-do 449-728, Korea.
2. Graduate Research Assistant, Dept. of Building, Civil, and Environmental Engineering, Concordia Univ., Montreal, QC, Canada H3 G 1M8.
3. Assistant Professor, Dept. of Building, Civil, and Environmental Engineering, Concordia Univ., Montreal, QC, Canada H3 G 1M8 (corresponding author).