1. Heat Treatment R&D Group, Korea Institute of Industrial Technology Research Institute of Advanced Manufacturing Technology Siheung-Si 15014 Republic of Korea
2. Institute of Material Technology Team Research & Development Center Poongsan Co., Ltd. Ulsan 4499 Republic of Korea
3. Advanced Engineering Team Research & Development Center Dong Yang Piston Co., Ltd. Asan-si 15420 Republic of Korea
4. Research & Development Center Bo Boo Hi-Tech Co., Ltd. Yongin-si 16882 Republic of Korea