1. Assistant Professor, College of Civil Engineering, Hunan Univ., Yuelu Mountain, Changsha, Hunan 410082, China.
2. Assistant Professor, Dept. of Architectural Engineering, Dankook Univ., 152 Jukjeon-ro, Gyeonggi-do 448-701, Korea (corresponding author).
3. Professor, Dept. of Architecture and Architectural Engineering, Seoul National Univ., 599 Gwanak-ro, Seoul 151-744, Korea.
4. President, SEN Coretech Inc., 6, Beodeunaru-ro 19 gil, Yeongdeungpo-gu, Seoul 150-040, Korea.