Affiliation: | 1. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151‐742, Korea;2. Department of Chemistry, University of California, Berkeley, CA 94720, USA;3. Interdisciplinary Program of Bioengineering, Seoul National University, Seoul 151‐742, Korea;4. World Class University Program on Multiscale Mechanical Design, Seoul National University, Seoul 151‐742, Korea |