1. Ph.D. Candidate, School of Construction Management and Engineering, Univ. of Reading, Whiteknights, P.O. Box 219, Reading, Berkshire RG6 6AW, U.K.
2. Assistant Professor, Dept. of Plant and Architectural Engineering, Kyonggi Univ., 152-42 Gwanggyosan-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-760, Republic of Korea.
3. Associate Professor, Dept. of Architectural Engineering, Dongseo Univ., 47 Jurye-ro, Sasang-gu, Busan 617-716, Republic of Korea (corresponding author).