[1] Huazhong Agr Univ, Coll Informat, Wuhan 430070, Peoples R China
[2] Univ Macau, Fac Sci & Technol, Macau 999078, Peoples R China
[3] Huazhong Agr Univ, Coll Sci, Wuhan 430070, Peoples R China
[4] Hubei Univ, Fac Math & Stat, Wuhan 430062, Peoples R China