1. The Institute of Electronic Technology, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
2. Department of Electrical Engineering, Milligan University, Johnson City, TN 37682, USA
3. Division of High-Technology Materials Research, Korea Basic Science Institute, Busan 46742, Republic of Korea
4. School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea