1. Ph.D. Student, Dept. of Architecture Engineering, Kwangwoon Univ., KwangWoon-ro 20, Nowon-gu, Seoul, South Korea.
2. Associate Professor, Dept. of Architecture Engineering, Kwangwoon Univ., KwangWoon-ro 20, Nowon-gu, Seoul, South Korea (corresponding author).
3. Associate Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., 326 Town Engineering, Ames, IA 50011.