1. School of Mathematics and Statistics, Guangxi Normal University, Guilin 541006, China.
2. Key Laboratory of Smart Manufacturing in Energy Chemical Process of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.
3. School of Mathematics, Southeast University, Nanjing 211189, China, and also with the Yonsei Frontier Laboratory, Yonsei University, Seoul 03722, South Korea.
4. School of Information Science and Engineering, Chengdu University, Chengdu 610106, China.