1. Division of WCU (World Class University) Multiscale Mechanical Design; School of Mechanical and Aerospace Engineering; Institute of Advanced Machinery and Design; Seoul National University; Seoul 151-744 South Korea
2. Interdisciplinary Program in Neuroscience; Seoul National University; Seoul 151-744 South Korea
3. Center for Functional Connectomics; Korea Institute of Science and Technology (KIST); Seoul 136-791 South Korea