1. Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
2. Creative Research Center for Brain Science, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
3. Department of Forest Sciences, Seoul National University, Seoul 08826, Republic of Korea
4. SOFT Foundry Institute, Seoul National University, Seoul 08826, Republic of Korea
5. Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea