1. R&D CenterDongkuk Steel 70 Geonposaneop-ro, Nam-gu 3214 beon-gil, Pohang Gyeongsangbuk-do Republic of Korea
2. Department of Metallurgical and Materials EngineeringColorado School of Mines Golden CO 80401 USA
3. Department of Metallurgical System EngineeringChonbuk National University Jeonju-si Jeollabuk-do 54896 Republic of Korea
4. School of Mechanical EngineeringPusan National University 30 Jangjeon-dong, Geumjeong-gu Busan 46241 Republic of Korea