1. Department of Electrical and Electronics Engineering Kangwon National University 1 Gangwondaehakgil Chuncheon-si Gangwon-do 24341 Republic of Korea
2. Interdisciplinary Graduate Program in BIT Medical Convergence Kangwon National University 1 Gangwondaehakgil Chuncheon-si Gangwon-do 24341 Republic of Korea
3. Department of Materials Science and Engineering The University of Texas at Dallas 800 West Campbell Road Richardson TX 75080 USA