1. Samsung Advanced Institute of Technology (SAIT); Samsung Electronics Company; San 14, Nongseo-dong, Giheung-gu Yongin-si Gyeonggi-do Korea
2. Department of Applied Physics; Korea University; Sejong City 339-700 Korea
3. Department of Materials Science and Engineering and Research Institute of Advanced Materials; Seoul National University; 1 Gwanangno Gwanak-gu Seoul 151-744 Korea
4. Polymer Research Institute; Department of Chemical Engineering; Pohang University of Science and Technology (POSTECH); Pohang 790-784 Korea