[Zhou Lijuan;Yue Xiaobo] Changsha Univ Sci & Technol, Coll Comp & Commun Engn, Changsha 410114, Peoples R China.^[Zhou Lijuan] Hunan Agr Univ, Coll Informat Sci & Technol, Changsha 410128, Peoples R China.^[Zhou Lijun] Hunan Agr Univ, Coll Foreign Languages, Changsha 410128, Peoples R China.