[Jiang Feng] Zhongnan Univ Econ & Law, Sch Math & Stat, Wuhan 430073, Peoples R China.^[Yang Hua;Shen Yi] Huazhong Univ Sci & Technol, Sch Automat, Wuhan 430074, Peoples R China.^[Yang Hua] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan 430023, Peoples R China.