1. Assst. Prof., Dept. of Civil Engineering, Dong-A Univ., Hadan2-dong, Saha-gu, Busan, South Korea.
2. Senior Engineer, Samsung Engineering and Construction, Seocho2-dong, Seocho-gu, Seoul, South Korea.
3. Prof., Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado, Boulder, CO 80309.
4. Prof., Dept. of Civil and Environmental Engineering, Seoul National Univ., Daehak-dong, Gwanak-gu, Seoul, South Korea.