1. Professor, CM&IT Lab., Dept. of Civil Engineering, Engineering Research Institute, Gyeongsang National Univ., Jinju 660-701, Korea.
2. Assistant Professor, Civil and Environment Engineering, San Jose Univ., One Washington Square, San Jose, CA 95192-0083.
3. Postdoctoral Researcher, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Ann Arbor, MI 48109 (corresponding author).
4. Professor, Dept. of Civil Engineering, Gyeongnam National Univ. of Science and Technology, Jinju 660-758, Korea.
5. Student Researcher, Dept. of Electrical and Computer Engineering, Seoul National Univ., Seoul 151-741, Korea.