1. Department of Aviation Maintenance Engineering, Far East University, Eumseong-gun, Chungcheongbuk-do 27601, Republic of Korea
2. Metal & Machinery Team, Korea Conformity Laboratories (KCL), Seoul 08503, Republic of Korea
3. Department of Electrical Engineering, Korea National University of Transportation, Chungju-si, Chungcheongbuk-do 27469, Republic of Korea
4. Department of Materials Science and Engineering, Kangwon National University, Samcheok-si, Gangwon-do 25912, Republic of Korea