[1]Electrical Lab, Nuclear Power Plant Engineering Department, KEPCO International Nuclear Graduate School, 658-91Haemaji-ro, Seosang-myeon, Ulus-gun, Ulsan 45014, Republic of Korea;
[2]The Dean of Academic Affairs (Professor), Nuclear Power Plant Engineering Department, KEPCO International NuclearGraduate School, 658-91 Haemaji-ro, Seosang-myeon, Ulus-gun, Ulsan 45014, Republic of Korea;