[Shao, Wei] Anhui Univ Technol, Coll Comp Sci & Technol, Maanshan 243000, Anhui, Peoples R China.
[Ding, Yihang] Henan Normal Univ, Coll Comp & Informat Engn, Xinxiang 453000, Henan, Peoples R China.
[Wen, Jinghao] Cent China Normal Univ, Sch Comp Sci, Wuhan 430000, Hubei, Peoples R China.
[Zhu, Pengxu] Univ North Carolina Greensboro, Coll Arts & Sci, Greensboro, NC 27401 USA.
[Ou, Lisong] Guilin Univ Technol, Coll Sci, Guilin 541000, Guangxi, Peoples R China.