1. Robotics Engineering Department; Daegu Gyeongbuk Institute of Science and Technology (DGIST); 711-873 Daegu South Korea
2. Brain Science Department; Daegu Gyeongbuk Institute of Science and Technology (DGIST); 711-873 Daegu South Korea
3. Institute of Robotics and Intelligent Systems; ETH Zurich; Zurich CH-8092 Switzerland
4. Department of Mechanical and Automation Engineering; The Chinese University of Hong Kong; Hong Kong SAR China