1. Ph.D. Candidate, Dept. of Architectural Engineering, Graduate School, Kyonggi Univ., Suwon-si, Gyeonggi-do 443-760, Republic of Korea.
2. Professor, Dept. of Plant·Architectural Engineering, Kyonggi Univ., Suwon-si, Gyeonggi-do 443-760, Republic of Korea (corresponding author).
3. Research Professor, Dept. of Plant·Architectural Engineering, Kyonggi Univ., Suwon-si, Gyeonggi-do 443-760, Republic of Korea.