1. Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea.
2. DGIST-ETH Microrobotics Research Center (DEMRC), DGIST, Daegu, South Korea.
3. Institute of Robotics and Intelligent Systems, ETH Zurich, Zurich, Switzerland.
4. Department of Electronic Systems Engineering, Hanyang University, Ansan, Korea.