1. Chair of Computational Materials Design (CMD), Faculty of Materials Science, Kim Il Sung University, Ryongnam-Dong, Taesong District, Pyongyang, P.O. Box 76, Democratic People’s Republic of Korea
2. Natural Science Center, Kim Il Sung University, Ryongnam-Dong,
Taesong District, Pyongyang, P.O. Box 76, Democratic People’s Republic of Korea