1. Department of Electrical and Electronics Engineering, Konkuk University, Seoul 05029, Republic of Korea
2. Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
3. Department of Electronics Engineering, Korea National University of Transportation, Chungju 27469, Republic of Korea
4. Semiconductor Research and Development Center, Samsung Electronics, Hwasung-si 18448, Republic of Korea