1. Korea Multi-purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyeongju-si, Gyeongbuk-do 38180, Republic of Korea
2. Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup-si, Gyeongbuk 56212, Republic of Korea
3. Department of Electronic Engineering, Andong National University, Andong-si, Gyeongbuk-do 36729, Republic of Korea