1. Department of Electrical Engineering, Chungnam National University 1 , 99, Dae-hak-ro, Yusung-gu, Daejeon 305-764, Republic of Korea
2. Department of Smart Agriculture Systems, Chungnam National University 2 , Daejeon 34134, Korea
3. Automotive Material and Components Research and Development Group, Korea Institute of Industrial Technology 3 , Gwangju 61012, South Korea