1. Senior Researcher, Research Institute of Science and Industrial Technology, Hwasung, South Korea; formerly, Research Scholar, Dept. of Civil Engineering, The Univ. of Texas, Austin, TX 78712 (corresponding author).
2. Senior Researcher, Daewoo Institute of Construction Technology, Suwon, South Korea.
3. Professor, Dept. of Architectural Engineering, Korea Univ., Seoul, South Korea.