1. Research Professor, School of Civil and Environmental Engineering, Yonsei Univ., Seoul, South Korea.
2. Undergraduate Student, School of Civil and Environmental Engineering, Yonsei Univ., Seoul, South Korea.
3. Professor, School of Civil and Environmental Engineering, Yonsei Univ., Seoul, South Korea.
4. Assistant Professor, Dept. of Civil and Environmental Engineering and Engineering Mechanics, Univ. of Dayton, OH.
5. Assistant Professor, School of Civil Engineering, Yonsei Univ., Seoul, South Korea.