1. Department of Architectural Engineering, Cheongju University, Cheongju, South Korea
2. Department of Architectural Engineering, Cheongju University, Cheongju, South Korea; Technical Sales Department, Asia Cement, Seoul, South Korea
3. Department of Architectural Engineering, Gyeongsang National University, Jinju, South Korea
4. Department of Civil and Environmental Engineering, Inha Technical College, Incheon, South Korea