[Zhang, Qianhong] Guizhou Coll Finance & Econ, Guizhou Key Lab Econ Syst Simulat, Guiyang 550004, Guizhou, Peoples R China.^[Yang, Lihui] Hunan City Univ, Dept Math, Hunan 413000, Peoples R China.^[Liao, Daixi] Hunan Inst Technol, Dept Basic Sci, Hunan 421002, Peoples R China.