1. Soft Robotics Research Center, Seoul National University, Seoul, Korea.
2. Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Korea.
3. School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA.
4. Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, USA.
5. Department of Mechatronics, Kangwon National University, Gangwon-do, Korea.
6. Institute of Advanced Machines and Design, Seoul National University, Seoul, Korea.