1. Department of Electronic Engineering, Kumoh National Institute of Technology, Gumi 39177, Republic of Korea
2. Department of Semiconductor System Engineering, Kumoh National Institute of Technology, Gumi 39177, Republic of Korea
3. Korea Atomic Energy Research Institute, Gyeongju-si 38180, Republic of Korea
4. School of Electronic Engineering, Kumoh National Institute of Technology, Gumi 39177, Republic of Korea