1. Department of Advanced Parts & Materials EngineeringGraduate School, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju 501-750, Korea
2. Department of Fire Safety ManagementDongkang College 160 Dongmunro, Bukgu, Gwangju 500-714, Korea
3. Department of Mechanical Design EngineeringChosun University, 375 Seosuk-dong, Dong-gu, Gwangju 501-750, Korea