[Zhang, Yi] Beijing Normal Univ, Coll Educ Future, Beijing, Peoples R China.
[Xu, Ke] Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan, Peoples R China.
[Yang, Jiumin; Pan, Yun] Cent China Normal Univ, Wuhan, Peoples R China.
[Pi, Zhongling] Shaanxi Normal Univ, Xian, Peoples R China.
[Pi, Zhongling] Shaanxi Normal Univ, Key Lab Modern Teaching Technol, Minist Educ, 199 South Changan Rd, Xian 710062, Shaanxi, Peoples R China.