1 Department of Physical Therapy, Jeonju University, Jeonju, South Korea.
2 Department of Rehabilitative and Assistive Technology, National Rehabilitation Center, Seoul, South Korea.
3 Department of Rehabilitation and Medicine, Ongoul Rehabilitation Hospital, Jeonju, South Korea.
4 Department of Electronics and Information Engineering, Korea University, Sejong, South Korea. cheolhan@korea.ac.kr.
5 Interdisciplinary Graduate Program for Artificial Intelligence Smart Convergence Technology, Korea University, Sejong, South Korea. cheolhan@korea.ac.kr.