1. Department of Mechanical and Aerospace engineering; Seoul National University; 1 Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
2. Soft Robotics Research Center; Seoul National University; 1 Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
3. Department of Mechanical engineering; Kumoh National Institute of Technology; 61 Daehak-ro, Gumi Gyeongbuk 39177 Republic of Korea
4. Institute of Advanced Machinery and Design; Seoul National University; 1 Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
5. Graduate School of Engineering Practice; Seoul National University; 1 Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea