1. Department of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea
2. Department of Physiology Yonsei University College of Medicine Seoul 03722 Republic of Korea
3. Department of Medical Science Brain Korea 21 Project Yonsei University College of Medicine Seoul 03722 Republic of Korea
4. Department of Engineering Science and Mechanics The Pennsylvania State University University Park PA 16802 USA
5. Center for Neural Engineering The Pennsylvania State University State College University Park PA 16802 USA
6. Department of Anatomy Yonsei University College of Medicine Seoul 03722 Republic of Korea
7. Electronic Device Laboratory School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea
8. Department of Biomedical Sciences College of Medicine Korea University Seoul 02841 Republic of Korea
9. Brain Research Institute Yonsei University College of Medicine Seoul 03722 Republic of Korea
10. Department of Anatomy College of Medicine Korea University Seoul 02841 Republic of Korea
11. Department of Materials Science and Engineering The Pennsylvania State University State College University Park PA 16802 USA
12. Materials Research Institute The Pennsylvania State University State College University Park PA 16802 USA
13. Yonsei‐KIST Convergence Research Institute Yonsei University Seoul 03722 Republic of Korea