Dimitar Radev, PhD is an Associate Professor at Department of Communication Technique and Technologies at the University of Rousse, Bulgaria. He is the Author of numerous publications. His mainly research interests are connected with teletraffic theory, simulation and modelling of communication networks, rare event simulation, evaluation of qualityDimitar Radev, PhD is an Associate Professor at Department of Communication Technique and Technologies at the University of Rousse, Bulgaria. He is the Author of numerous publicati….