TY - CPAPER AU - Tadeusz Czachórski AU - M. Nycz AU - T. Nycz AU - V. Vishnevsky AB - The article summarises author`s experience in two problems related to the use of queueing models in performance evaluation of computer networks: modelling transient states of queues and computations for queueing network models having large number of nodes. Both issues are not well represented in classical queuing theory, yet important to applications, because the observed traffic is time dependant and network topologies that should be considered become larger and larger. The article discusses two approaches: diffusion approximation and fluid-flow approximation that can cope with much larger models that are attainable with the use of Markov chains. BT - Distributed Computer and Communication Networks LA - eng N1 - 17th International Conference, DCCN 2013 Moscow, Russia, October 7-10, 2013 N2 - The article summarises author`s experience in two problems related to the use of queueing models in performance evaluation of computer networks: modelling transient states of queues and computations for queueing network models having large number of nodes. Both issues are not well represented in classical queuing theory, yet important to applications, because the observed traffic is time dependant and network topologies that should be considered become larger and larger. The article discusses two approaches: diffusion approximation and fluid-flow approximation that can cope with much larger models that are attainable with the use of Markov chains. PB - Springer International Publishing Switzerland PY - 2014 EP - 58–72 T2 - Distributed Computer and Communication Networks TI - Modelling Transient States in Queueing Models of Computer Networks: A Few Practical Issues ER -