[Guo, Jinglei;Shao, Miaomiao] Cent China Normal Univ, Sch Comp Sci, Wuhan, Peoples R China.^[Jiang, Shouyong] Univ Lincoln, Sch Comp Sci, Lincoln, England.^[Zhou, Xinyu] Jiangxi Normal Univ, Sch Comp & Informat Engn, Nanchang, Jiangxi, Peoples R China.