1. Department of Electrical and Electronics Engineering, Kangwon National University, 1 Gangwondaehakgil, Chuncheon-si, Gangwon-do 24341, South Korea
2. Interdisciplinary Graduate Program in BIT Medical Convergence, Kangwon National University, 1 Gangwondaehakgil, Chuncheon-si, Gangwon-do 24341, South Korea
3. Department of Materials Science and Engineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
4. School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea