1. School of Physics and Chemistry; Gwangju Inst. of Science and Technology; Gwangju 500-712 Republic of Korea
2. Inst. of Agriculture and Life Science; Gyeongsang Natl. Univ.; Jinju Gyeongnam 660-701 Republic of Korea
3. Div. of Applied Life Science; Graduate School, Gyeongsang Natl. Univ.; Jinju Gyeongnam 660-701 Republic of Korea