[1] Technical University of Cluj-Napoca, Northern University Centre of Baia Mare, Faculty of Engineering-Department of Engineering and Technology Management, 62A, Victor Babes Street, Maramures, Baia Mare,430083, Romania
[2] Institute of Technical and Agricultural Sciences, University of Nyíregyháza, 31/b, Sóstói Street, Nyíregyháza,4400, Hungary
[3] Lucian Blaga University of Sibiu, Faculty of Engineering, Industrial Engineering and Management Department, 10 Victoriei Street, Sibiu,550024, Romania
[4] Academy of Romanian Scientists, 3 Ilfov Street, Bucharest,050044, Romania