Hyun-Jin Ahn 1, Kang-Won Kim 1, Joon-Ho Choi 1, Eui-Sun Kim 2 and Young-Cheol Lim 1,* 1 Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, Korea; zook1052@nate.com (H.-J.A.); hihopx1@naver.com (K.-W.K.); joono@chonnam.ac.kr (J.-H.C.) 2 Department of Information and Communication, Shingyeong University, Hwaseong 445-852, Korea; eskim@sgu.ac.kr * Correspondence: y...