Previous emergency service covering models consider all the calls to be of the same importance and impose the same waiting time constraints independently of the service's priority. This type of constraint is clearly inappropriate in many contexts. For example, in urban medical emergency services, calls that involve danger to human life deserve higher priority over calls for more routine inciden...

In this paper we present a technique for deriving approximate measures for finite capacity queuing networks. The fact that buffers have finite capacity makes the analysis of such networks very difficult. Indeed, FC-QNs do not have a product form solution, except for a limited number of special cases. In general exact solution for such models can only be obtained using numerical methods. However...

We are developing a new approach to traffic characterization motivated by the traffic-queue analysis techniques of effective bandwidth and the use of log moment generating functions. A generic representation of traffic exhibiting nonGaussian marginal and long range dependence is modeled by three dissimilar stochastic models. Generated traces of the model traffic are put to test in a G/D/1/1 sys...

Fork/join stations are commonly used to model the synchronization constraints in queuing models of computer networks, fabrication/assembly systems and material control strategies for manufacturing systems. This paper presents an exact analysis of a fork/join station in a closed queuing network with inputs from servers with two-phase Coxian service distributions, which models a wide range of var...

Queuing network models of modern computing systems must consider a large number of components (e.g., Web servers, DB servers, application servers, firewall, routers, networks) and hundreds of customers with very different resource requirements. The complexity of such models makes the application of exact solution techniques prohibitively expensive, motivating research on approximate methods. Th...

The psychological refractory period (PRP) is a basic but important form of dual-task information processing. Existing serial or parallel processing models of PRP have successfully accounted for a variety of PRP phenomena; however, each also encounters at least 1 experimental counterexample to its predictions or modeling mechanisms. This article describes a queuing network-based mathematical mod...

How the brain converts parallel representations of movement goals into sequential movements is not known. We tested the role of basal ganglia (BG) in the temporal control of movement sequences by a convergent approach involving inactivation of the BG by muscimol injections into the caudate nucleus of monkeys and assessing behavior of Parkinson's disease patients, performing a modified double-st...

For link packet loss rate, delay and throughput etc. QoS performance analysis in wireless communication systems, queuing analysis based on measuring or estimating models for traffic flow and wireless channel is one of critical technologies. However, the complicated modern wireless communication systems and unreliable wireless channels usually cause accurate wireless channel models very complica...

Finding a configuration of a distributed system satisfying performance goals is a complex search problem that involves many design parameters, like hardware selection, job distribution and process configuration. Performance models are a powerful tool to analyze potential system configurations, however, their evaluation is expensive, such that only a limited number of possible configurations can...