[1] Tianjin Univ, Tianjin Key Lab Adv Networking, Coll Intelligence & Comp, Tianjin 300350, Peoples R China
[2] Qingdao Huanghai Univ, Qingdao 266427, Peoples R China
[3] Norwegian Univ Sci & Technol, Dept Comp Sci, N-7491 Trondheim, Norway
[4] Tianjin Univ, Coll Intelligence & Comp, Tianjin 300350, Peoples R China
[5] Qingdao Univ, Coll Comp Sci & Technol, Qingdao 266071, Peoples R China
[6] Shandong Univ Sci & Technol, Coll Comp Sci & Engn, Qingdao 266590, Peoples R China
[7] Shanghai Univ, Ctr Comp, Shanghai 200444, Peoples R China