1. School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
2. School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
3. Department of Electrical Engineering, Milligan University, Johnson City, TN 37682, USA
4. Department of Electronics Engineering, Sejong University, Seoul 05006, Republic of Korea
5. The Institute of Electronic Technology, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea