1. Power Apparatus Research Division, Korea Electrotechnology Research Institute, 12, Jeongiui-gil, Seongsan-gu, Changwon-si, Gyeongsangnam-do 51543, Republic of Korea
2. Department of Materials Science and Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
3. Etamax Co., Ltd., 280-17, Saneop-ro 155 Beon-gil, Gwonseon-gu, Suwon-si, Gyeonggi-do 16648, Republic of Korea