1. Assistant Professor, Dept. of Civil Engineering, Dong-A Univ., Hadan2-dong, Saha-gu, Busan 604-714, Korea.
2. Senior Engineer, Samsung Engineering and Construction, Samsung Plaza Bldg. 263, Seohyun-Dong, Bundang-Gu Sungnam-si, Gyonggi-do 463-721, Korea.
3. Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado, Boulder, CO 80309.
4. Professor, School of Civil, Urban, and Geosystem Engineering, Seoul National Univ., San 56-1, Shinlim-dong, Gwanak-gu, Seoul 151-742, Korea.