1. Department of Mechanical Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 South Korea
2. Mechatronics Research Samsung Electronics 1 Samsungjeonja‐ro Hwaseong‐si Gyeonggi‐do 18848 South Korea
3. Department of Mechanical Engineering Carnegie Mellon University Pittsburgh PA 15213 USA
4. Department of Mechanical Engineering BK21 FOUR ERICA‐ACE Center Hanyang University 55 Hanyangdaehak‐ro, Sangnok‐gu Ansan Gyeonggi‐do 15588 South Korea
5. Institute of Advanced Machines and Design/Institute of Engineering Research Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 South Korea