Institution: | 1.Life Science Department, University of Science, 999095, Pyongyang, Democratic People’s Republic of Korea ;2.School of Management, Harbin Institute of Technology, 150001, Harbin, Heilongjiang, China ;3.Department of Engineering Machine, Pyongyang University of Mechanical Engineering, 950003, Pyongyang, Democratic People’s Republic of Korea ;4.Life Science Department, Kim Il Sung University, 999093, Pyongyang, Democratic People’s Republic of Korea ; |