1. School of Construction Management and Engineering, University of Reading, Whiteknights, P.O. Box 219, Berkshire, Reading RG6 6AW, UK
2. Department of Plant/Architectural Engineering, Kyonggi University, 152-42 Gwanggyosan-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-760, Republic of Korea