1. Deputy General Manager, Magok Future Research Park TF, Kolon Global Corporation, Incheon 406-081, Korea.
2. Postdoctoral Fellow, Dept. of Architectural Engineering, Yonsei Univ., Seoul 120-749, Korea.
3. Associate Professor, Dept. of Architectural Engineering, Yonsei Univ., Seoul 120-749, Korea (corresponding author).
4. Professor, Dept. of Architectural Engineering, Yonsei Univ., Seoul 120-749, Korea.