1. School of Electrical and Electronic Engineering; Chung-Ang University; Seoul Korea
2. Department of Applied Materials Engineering; Hanbat National University; Daejeon Korea
3. Materials & Devices Advanced Research Institute; LG Electronics; Seoul Korea
4. Civil Engineering Program; Department of Mechanical Engineering; Stony Brook University; NY USA
5. Photon Sciences Directorate; Brookhaven National Laboratory; Upton NY USA
6. Department of Chemistry; Chung-Ang University; Seoul Korea
7. School of Advanced Materials Science and Engineering and SKKU Advanced Institute of Nanotechnology (SAINT); Sungkyunkwan University; Suwon 440-746 Korea