Affiliation: | (1) Department of Physics, Chungbuk National University, 360-763 Cheongju, Korea;(2) Korea Advanced Institute of Science and Technology, 305-338 Taejon, Korea;(3) Department of Physics, Dongguk University, 100-715 Seoul, Korea;(4) Korea Research Institute of Standards and Science, 305-600 Taejon, Korea;(5) Agency for Defense Development, 300-600 Taejon, Korea |