Institution: | (1) Department of Physics, Pusan National University, 30 Changjeon-dong, Keumjeong-ku, Pusan, Korea 609–735, KR;(2) Environmental Geology Division, Korea Institute of Geology, Mining and Materials (KIGAM), 30 Kajung-dong, Yusong-ku, Taejeon, Korea 305–350, KR |