Affiliation: | 1. School of Computer Science and Information Technology, Northeast Normal University, Changchun 130117, China;2. School of Mathematics and Statistics, Northeast Normal University, Changchun 130024, China;3. Changchun Medical Higher Training School, Changchun 130031, China;4. School of Physics, Northeast Normal University, Changchun 130024, China;5. Key Laboratory for Applied Statistics of MOE, Northeast Normal University, Changchun 130024, China |