1. Professor, Dept. of Architecture, Seoul National Univ., 39-430, San 56-1 Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea.
2. Ph.D. Candidate, Dept. of Architecture, Seoul National Univ., 39-425, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea.
3. Associate Professor, Dept. of Architecture, Seoul National Univ., 39-425, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea.
4. Professor, Dept. of Computer Engineering, Pusan National Univ., San 30, Jangjeon-dong, Gumjung-gu, Busan 609-735, Korea.
5. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Michigan, Ann Arbor, MI 48109 (corresponding author).