Erik Chromy

Work place: Institute of Telecommunications, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Bratislava, Slovak Republic



Research Interests: Computer systems and computational processes, Computer Networks, Theory of Computation, Models of Computation


Erik Chromy: was born in Veľký Krtíš, Slovakia, in 1981. He received the Master degree in telecommunications in 2005 from Faculty of Electrical Engineering and Information Technology of Slovak University of Technology (FEI STU) Bratislava. In 2007 he submitted PhD work from the field of Observation of statistical properties of input flow of traffic sources on virtual paths dimensioning and his scientific research is focused on optimizing of processes in convergent networks. Nowadays he works as assistant professor at the Institute of Telecommunications of FEI STU Bratislava.

Author Articles
Measurement Based Admission Control Methods in IP Networks

By Erik Chromy Tomas Behul

DOI:, Pub. Date: 8 Sep. 2013

Trends in telecommunications show that customers require still more and more bandwidth. If the telecommunication operators want to be successful, they must invest a lot of money to their infrastructure and they must ensure required quality of service. The telecommunication operators would devote to development in this area. The article deals with quality of service in IP networks. Problems of quality of service can be solved through admission control methods based on measurements. These admission control methods take care of control of incoming traffic load. New flow can be accepted only if needed quality of service is ensured for it and without quality of service breach causing of already accepted flows. In the article were made description of simulations and results of simulations for Voice over IP, constant bit rate and video sources. Simulations were realized in Network simulator 2 environment. These simulations were evaluated on the base of some parameters such as: estimated bandwidth, utilization and loss rate.

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Application of Erlang Formulae in Next Generation Networks

By Erik Chromy Tibor Misuth Adam Weber

DOI:, Pub. Date: 8 Feb. 2012

The paper deals with the possibility of the Erlang B and Erlang C formula utilization in Next Generation Networks (NGN). Based on the common properties of synchronous and asynchronous networks it is possible the utilization of Erlang formulas also for asynchronous networks. It is possible to describe traffic in NGN networks by calculation of following parameters – loss, link utilization and bandwidth. The second part of this paper deals with the possibility of application of Erlang B formula in contact center. Contact center is one of the many examples of the NGN networks. By application of Erlang B formula in contact center environment it is possible to monitor following important parameters - number of agents, probability of call blocking, utilization of agents and mean number of calls in the system.

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Other Articles