Affiliation: | (1) Seoul Development Institute, San 4–5, Yejang-dong, Jung-ku Seoul 100–250, Korea Fax: 2-2-726-1187 e-mail: yjkim@www.sdi.re.kr, KR;(2) Department of Geology, College of Natural Science Pusan National University Pusan 609–735, Korea, KR |