1. Ph.D. Student, Dept. of Architecture and Architectural Engineering, Seoul National Univ., #39-425, Gwanak-ro 1, Gwanak-gu, Seoul 08826, Korea.
2. Professor, Dept. of Architecture and Architectural Engineering, Seoul National Univ., #39-425, Gwanak-ro 1, Gwanak-gu, Seoul 08826, Korea.
3. Professor, Dept. of Architecture and Architectural Engineering, Seoul National Univ., #39-425, Gwanak-ro 1, Gwanak-gu, Seoul 08826, Korea (corresponding author).