01099nas a2200193   4500000000100000000000100001008004100002260003500043100002400078700001200102700001200114700002000126700002200146700001400168700001300182245008200195300001400277520061400291       2013                            d  c6bSpringeraBerlin Heidelberg1 aTadeusz Czachórski1 aM. Nycz1 aT. Nycz1 aFerhan Pekergin1 aAndrzej Kwiecień1 aPiotr Gaj1 aP. Stera00aAnalytical and numerical means to model transient states in computer networks  a426–4353 aTransient queue analysis is needed to model the influence of time-dependent flows on congestion in computer networks. It may be applied to the networks performance evaluation and the analysis of the transmissions quality of service. However, the exact queuing theory gives us only few practically useful results, concerning mainly M/M/1 and M/M/1/N queues. The article presents potentials of three approaches: Markovian queues solved numerically, the diffusion approximation, and fluid-flow approximation. We mention briefly a software we implemented to use these methods and summarise our experience with it.