[1] Pohang Univ Sci & Technol, Dept Elect Engn, Pohang 790784, Gyeongbuk, South Korea
[2] Gyeongsang Natl Univ, Sch Med, Inst Hlth Sci, Biomed Ctr BK21, Jinju 660751, Gyeongnam, South Korea
[3] Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA
[4] Gyeongsang Natl Univ, Sch Med, Dept Oral & Maxillofacial Surg, Jinju 660751, Gyeongnam, South Korea
[5] Pusan Natl Univ, Dept Internal Med, Sch Korean Med, Yangsan 626810, Gyeongnam, South Korea