1. Department of Materials Science and Engineering; Korea University; Seoul 136-701 Korea
2. Department of Nano-Bio-Information-Technology; KU-KIST Graduate School of Converging Science and Technology; Anam-dong 5-ga Seongbuk-gu Seoul 136-701 Korea
3. Electronic Materials Center; KIST 39-1 Hawolgok-dong Seongbuk-gu Seoul 136-791 Korea
4. Department of Radio Communications Engineering; Korea University; Seoul 136-701 Korea
5. Department of Electronic Engineering; Hoseo University; 20, Hoeo-ro 79 beon-gil, Baebang-eup, Asan-si Chungcheongnam-do 31499 Korea