Kang Wangqiang1, Wang Yu2, Lu Jiakuan1,2,*, Meng Wei3
1. School of Information Engineering, Guilin University, Guilin 541006, China;
2. School of Mathematics and Statistics, Guangxi Normal University, Guilin 541001, China;
3. School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin 541004, China