1. Faculty of Electronic Engineering, Department of Control Systems, University of Niš, Aleksandra Medvedeva 14, Niš 18000, Republic of Serbia e-mail:
2. Professor Faculty of Electronic Engineering, Department of Control Systems, University of Niš, Aleksandra Medvedeva 14, Niš 18000, Republic of Serbia e-mail:
3. Assistant Professor Faculty of Electronic Engineering, Department of Control Systems, University of Niš, Aleksandra Medvedeva 14, Niš 18000, Republic of Serbia e-mail: