1. DCRC of Dongshin University, 185 Geonjae-ro, Naju City, Jeonnam 520-714, Republic of Korea
2. HUINTECH Co., A-dong 6-Ho, 17-27 Cheomdangwagi-ro, 208 Beon-gil, Buk-gu, Gwangju 500-480, Republic of Korea
3. Department of Information and Communication Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 501-759, Republic of Korea