Recently, much attention has been paid to systems in which the components are not reliable, that is subject to random breakdowns. Furthermore, intensive research is carried out on systems evolving in random environment, that is, when the component processes are dynamically controlled by the state of a background random process, mainly, finite-state Markov chain. Our current investigation is extended towards the performance modelling of finite-source retrial queueing systems with nonreliable servers, too.

Current research topics are