作者机构:[1]School of Computer Science, Qinghai Normal University, Xining 810008, China, [2]Network Information Center, Qinghai Normal University, Xining 810008, China
相关基金:supported by the Program for New Century Excellent Talents in University of China(NCET-11-1025); the National Natural Science Foundation of China(61162003,61163050,6126104); Qinghai Office of Science and Technology(2012-Z-902); the National Basic Research Program of China(2011CB311809); the Natural Science Foundation of Tianjin(10JCYBJC00600)