1. Postdoctoral Researcher, Dept. of Building and Real Estate, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.
2. Professor, Dept. of Architecture and Architectural Engineering, Seoul National Univ., 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
3. Assistant Professor, School of Construction Engineering, Kyungil Univ., Gyeongbuk 712-701, Korea (corresponding author).
4. Postdoctoral Researcher, Dept. of Civil and Environmental Engineering, Seoul National Univ., 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.