1. Assistant Professor, Dept. of Architectural Engineering, Yonsei Univ., Seoul, Korea (corresponding author).
2. Visiting Scholar, Div. of Construction Engineering and Management, Purdue Univ., West Lafayette, IN.
3. Professor, Dept. of Architectural Engineering, Univ. of Seoul, Seoul, Korea.
4. Associate Professor, School of Architecture, Inha Univ., Incheon, Korea.