1. Assistant Professor, Dept. of Civil Engineering, Kyung Hee Univ., Yongin 17104, South Korea.
2. Professor, School of Civil, Environmental, and Architectural Engineering, Korea Univ., Seoul 02841, South Korea (corresponding author).
3. Assistant Professor, Dept. of Marine Civil Engineering, Chonnam National Univ., Yeosu 59626, South Korea.
4. Professor, School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Dr. N.W., Atlanta, GA 30332-0355.