1. Associate Professor, Dept. of Architectural Engineering, Ajou Univ., Suwon, South Korea 443-749 (corresponding author).
2. Ph.D. Student, Dept. of Architectural Engineering, Ajou Univ., Suwon, South Korea 443-749.
3. Associate Professor, Dept. of Architectural Engineering, Sunmoon Univ., Tanjung-Myun, Asan, South Korea 336-708.