Affiliation: | aSchool of Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, South Korea bDepartment of Disaster Prevention Engineering, University of Seoul, 90 Jeonnong-dong, Dongdeamoon-gu, Seoul 130-743, South Korea cDepartment of Interior and Environment Design, Daewon Science College, 599 Shinwol-dong, Jecheon-si, Chungcheongbuk-do 390-702, South Korea |