1. School of Undergraduate Studies, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, South Korea
2. Department of Robotics and Mechatronics Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, South Korea
3. Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, South Korea
4. Energy Science and Engineering Center, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, South Korea