1. Department of Electrical Engineering, ERI, Gyeongsang National University, 501 Jinjudaero, Jinju, Gyeongnam 52828, Republic of Korea
2. School of Electronics Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
3. Korea Institute of Industrial Technology (KITECH), 320 Techno-Sunhwanro, Daegu 42990, Korea
4. ITODYS, CNRS UMR 7086, Université Paris Diderot (Paris7), 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France