1. Human Centered CAD Laboratory, School of Mechanical and Aerospace Engineering, Seoul National University: 301-dong 209-ho, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea
2. Biomechanics Laboratory, Department of Physical Education, Seoul National University, Republic of Korea
3. Korea National Rehabilitation Center Research Institute, Department of Rehabilitation and Assistive Technology, Republic of Korea
4. Mechatronics and Field Robotics Laboratory, Department of Mechanical Engineering, Korea University, Republic of Korea