LCSM (MOE) and School of Mathematics and Statistics Hunan Normal University Changsha 410081 China;
Information Science and Engineering College Hunan International Economics University Changsha 410205 China;
LCSM (MOE) and School of Mathematics and Statistics Hunan Normal University Changsha 410081 China;
LCSM (MOE) and School of Mathematics and Statistics Hunan Normal University Changsha 410081 China;