Affiliation: | 1. System LSI, Samsung Electronics Co., Yongin, 445-702, Korea 2. Samsung Advanced Institute of Technology, Yongin, 446-712, Korea 3. Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 790-784, Korea 4. Department of Physics, Yonsei University, Wonju, 220-710, Korea
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