[1] Shahid Rajaee Teacher Training Univ, Fac Sci, Dept Math, Tehran 16785136, Iran
[2] CUNY City Coll, Dept Comp Sci, 138th St & Convent Ave, New York, NY 10031 USA
[3] Swiss Distance Univ Appl Sci, Dept Comp Sci, Schinerstr 18,Postfach 689, CH-3900 Brig, Switzerland
[4] Tyrolean Private Univ UMIT TIROL, Dept Biomed Comp Sci & Mechatron, A-6060 Hall In Tirol, Austria
[5] Nankai Univ, Coll Artificial Intelligence, Tianjin 300350, Peoples R China