1. a Korea Electric Power Research Institute , 103-16 Munji-dong, Yuseong-gu, Daejeon , 305-380 , Republic of Korea
2. b Department of Nuclear Engineering , Chosun University , 375 Seosuk-dong, Dong-gu, Gwangju , 501-759 , Republic of Korea
3. c Department of Mechanical Engineering , Chungnam National University , 220 Kung-dong, Yuseong-gu, Daejeon , 305-764 , Republic of Korea