1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Yonsei Univ., Seoul, Korea.
2. Undergraduate Student, Dept. of Civil and Environmental Engineering, Yonsei Univ., Seoul, Korea.
3. Ph.D Student, Dept. of Civil and Environmental Engineering, Yonsei Univ., Seoul, Korea.
4. Professor, Dept. of Electrical and Computer Engineering, Univ. of Dayton, OH.
5. Assistant Professor, Dept. of Civil and Environmental Engineering, Yonsei Univ., Seoul, Korea.