1. Graduate School of Architectural EngineeringChosun University, Gwangju 501-759, Korea
2. Graduate School of Civil EngineeringWuhan University of Technology, Wuhan 430070, China
3. School of Mechanical EngineeringYeungnm University, Gyeongsan 712-749, Korea
4. School of Architectural EngineeringChosun University, Gwangju, 501-759, Korea