1. Research Fellow, Dept. of Architectural and Urban Systems Engineering, Ewha Womans Univ., 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea.
2. Professor, Dept. of Architectural and Urban Systems Engineering, Ewha Womans Univ., 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea (corresponding author).
3. Assistant Professor, Dept. of Architectural and Urban Systems Engineering, Ewha Womans Univ., 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea.