[Jia, Liyuan;Huang, Li] Hunan City Univ, Dept Comp Sci, Yiyang 413000, Hunan, Peoples R China.^[Li, Lei] HeNan XinYang Normal Coll, Coll Comp & Informat Technol, Henan 464000, Peoples R China.^[Gong, Wenyin] China Univ Geosci, Sch Comp Sci, Wuhan 430074, Peoples R China.