1. Department of Biomedical and Electronic Engineering, Chonnam National University, Daehak-ro 50 Yeosu, Jeonnam, Korea
2. Redone Technologies Co. Ltd., Gwangju, Korea
3. Department of Electronic Engineering, Sunchon National University, Sunchon, Jeonnam, Korea
4. Division of Electrical Electronic Communication and Computer Engineering, Chonnam National University, Daehak-ro 50 Yeosu, Jeonnam, Korea