This paper is concerned with the dynamic assignment of servers to tasks in queueing networks where demand may exceed the capacity for service. The objective is to maximize the system throughput. We use fluid limit analysis to show that several quantities of interest, namely the maximum possible throughput, the maximum throughput for a given arrival rate, the minimum arrival rate that will yield...

The use of computer-based clinical decision support (CDS) tools is growing significantly in recent years. These tools help reduce waiting lists, minimise patient risks and, at the same time, optimise the cost health resources. In this paper, we present a CDS application that predicts the probability of having unst able angina based on clinical data. Due to the characteristics of the variables (...

Networks of coupled periodic oscillators (similar to the Kuramoto model) have been proposed as models of associative memory. However, error-free retrieval states of such oscillatory networks are typically unstable, resulting in a near zero capacity. This puts the networks at disadvantage as compared with the classical Hopfield network. Here we propose a simple remedy for this undesirable proper...

The probable lack of some arcs and nodes in the stochastic networks is considered in this paper, and its effect is shown as the arrival probability from a given source node to a given sink node. A discrete time Markov chain with an absorbing state is established in a directed acyclic network. Then, the probability of transition from the initial state to the absorbing state is computed. It is as...

We study the cyclic dominance of three species in two-dimensional constrained Newman-Watts networks with a four-state variant of the rock-paper-scissors game. By limiting the maximal connection distance Rmax in Newman-Watts networks with the long-range connection probability p , we depict more realistically the stochastic interactions among species within ecosystems. When we fix mobility and va...

unstable angina has progressive process and even in rest time, it happens frequently. it is a serious situation and 15-20 percent of patients are dying in duration of one year. treatment: patients often hospitalized because observation of their reactions to treatment is easier in hospital. treatment plan must be explain for them carefully. when patient’s situation due to anxiety is critical, be...

Natural languages exhibit context-free properties such as center-embedded clauses. Recent research has sought a model that performs on these features with human-like inconsistencies, rather than like traditional discrete automata. This search has recently focussed on recurrent neural networks. It has been shown theoretically that recurrent networks are computationally as powerful as Turing mach...

recent reports have suggested that cytomegalovirus (cmv) infection may contribute to risk of cardiovascular disease. however, relationship between cmv infection and unstable angina (ua) is controversial and studies about this subject in iran and even region are lacking. the aim of this study was to determine whether unstable angina is related to seropositivity to chronic cytomegalovirus infecti...

Large networks relying on real-time processing can be driven into unstable modes of operation (e.g., routing system failures, routing flaps, congestion and deadlock scenarios, system crash chain reactions, etc.). In the past, unintentional system faults have led to frame relay networks, SS7 signaling networks, and PSTNs going into unstable modes that have led to major service disruptions. A ser...

This paper investigates the problem of global exponential stability for a class of impulsive cellular neural networks with time delay. By employing Lyapunov functionals, some sufficient conditions for exponential stability are established. Our results show that unstable cellular neural networks with time delay may be stabilized by impulses, where the upper bound of the amplitudes of the impulse...