Comparing the performance of a set of activities or organizations under uncertainty environment has been performed by means of Fuzzy Data Envelopment Analysis (FDEA) since the traditional DEA models require accurate and precise performance data. As regards a method for dealing with uncertainty environment, many researchers have introduced DEA models in fuzzy environment. Some of these models ar...

Regarding the fact that getting a suitable combination of the human resources and service stations is one of the important issues in the most service and manufacturing environments, In this paper, we have studied the two models of planning queuing systems and its effect on the cost of the each system by using two fuzzy queuing models of M/M/1 and M/E2/1. In the first section, we have compar...

A network of single server queues with routing is considered. These networks have a product form stationary distribution. A new limit result proves a sequence of such networks converges weakly to a stochastic flow level model. This stochastic model is insensitive. A large deviation principle for the stationary distribution of these queueing networks is found. Its rate function has a dual formul...

We examine the tradeoffs between two variants of group strategyproofness, efficiency and budget balance in queueing models. In general, group strategyproofness is incompatible with efficiency and budget balance. Weakening budget balance to feasibility, we show that the incompatibility persists with strong group strategyproofness. We then identify a necessary condition for weak group strategypro...

From a business point of view, a call centre is an entity that combines voice and data communications technology to enable organizations to implement critical business strategies or tactics aimed at reducing costs or increasing revenues. At an organizational level, cost are highly dependent on capacity management of human and technical resources. By utilizing methods of operations research and ...

The theory of queueing systems is traditionally considered as a branch of applied probability. Hence the toolkit used in the analysis of queueing system draws heavily on the theory of stochastic processes. Many problems in the area of queueing networks, however, are of algorithmic nature, and thus require algorithmic/complexity theoretic approaches. In this tutorial we will discuss several such...

Queueing network models have emerged as useful models of computer systems. While such models have been known and studied for some time in the area of operations research. their application to the study of computers has stimulated further research. both into extending the basic results and into developing etiicient techniques for their solution. Currently, there does not appear to be any "best" ...

Instability in packet-switching networks is normally associated with overload conditions, since queueing network models show that, in simple configurations, only overload generates instability. However, some results showing that instability can happen also in underloaded queueing networks appeared in the recent literature. Underload instabilities can be produced by complex scheduling algorithms...