1. Department
of Nano-mechatronics, Korea University of Science and Technology, 217 Gajeong-ro Daejeon 305-333, Yuseong-gu, Korea
2. Nano-convergence
Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156 Gajungbukno, Daejeon 305-343, Yuseong-gu, Korea