1. School of Sciences, Southwest Petroleum University, Chengdu 610500, P. R. China
2. Institute for Artificial Intelligence, Southwest Petroleum University, Chengdu 610500, P. R. China
3. School of Mathematics, Southwest Jiaotong University, Chengdu 610031, P. R. China
4. China Aerodynamics Research and Development Center, Mianyang 621000, P. R. China