1. Researcher, Texas A&M Univ., College Station, TX 77843-3137; formerly, Ph.D. Candidate, Dept. of Architecture and Building Science, Chung-Ang Univ., Seoul 156-756, South Korea.
2. Assistant Professor, Dept. of Construction Science, Texas A&M Univ., 3137 TAMU, Langford A433, College Station, TX 77843-3137 (corresponding author).
3. Professor, Dept. of Architecture and Building Science, Chung-Ang Univ., Seoul 156-756, South Korea.
4. Graduate School of Construction Engineering, Chung-Ang Univ., Seoul 156-756, South Korea.