1. Department of Healthcare Engineering, Chonbuk National University, Deokjin-gu, Jeonju-si, Korea
2. Division of Biomedical Engineering, Chonbuk National University, Korea
3. Research Center of Healthcare & Welfare Instrument for the Aged, Chonbuk National University, Korea
4. R&D Division, Chonbuk National University Automobile-parts & Mold Technology Innovation Center, Korea