1. Digital Health Care R&D Department, Korea Institute of Industrial Technology (KITECH), Cheonan 31056, Korea
2. Department of Robotics and Mechatronics Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Korea
3. Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
4. Department of Mechanical Engineering, Gachon University, Sungnam 13120, South Korea