1. Department of Chemical & Biomolecular Engineering (BK 21 Graduate Program), Korea Advanced Institute of Science and Technology(KAIST), 335 Gwahangno, Yuseong-gu, Daejeon, 305-701 Republic of Korea
2. Nano-Mechanical Systems Research Division, Korea Institute of Machinery & Materials(KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea
3. Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea