1. Heat Treatment R&D Group; Korea Institute of Industrial Technology; Research Institute of Advanced Manufacturing Technology; Siheung-Si 15014 Republic of Korea
2. Advanced Engineering Team; Research and Development Center; Dong Yang Piston Co., Ltd.; Asan-si 15420 Republic of Korea
3. Materials Technology Team; Research and Development Center; Yoosung Enterprise Co., Ltd.; Asan-si 31409 Republic of Korea