We consider a network of parallel service stations each modelled as a single server queue. Each station serves its own dedicated customers as well as generic customers who are routed from a central controller. We suppose that the cost incurred by a customer is an increasing function of her time spent in system. In a significant advance on most previous work, we do not require waiting costs to b...

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Channel estimation plays an important role in wireless communication due to its random nature of the channel. Randomness creates the constructive or destructive fading. The combination of Orthogonal frequency-division multiplexing (OFDM) with multiple antennas at both the base station and mobile terminal converts frequency selectivity of the channel fading into flat fading parallel sub-channels...

High Performance Computing has demonstrated extensively its potential benefit for reaching an efficient processing of 3D medical images. However, there are few commercial image-processing solutions that benefit from High Performance Computing. Although bi-processor systems are currently affordable, configurations with more processors are still very expensive. Cluster systems are bulky and canno...

In event-driven sensor networks, when a critical event occurs, sensors should transmit quickly and securely messages back to base station. We choose Elliptic Curve Cryptography to secure the network since it offers faster computation and good security using shorter keys than RSA protocol. In order to minimize the computation time, we propose to distribute the computation of scalar multiplicatio...

While the advertisements shown by television stations pay for the content that the stations provide, most of us would rather not watch them. This paper describes a system called mythcomm that attempts to make removing them easy through a visualization. We want to do this quickly, since it would be as worthwhile to simply watch the commercials if it took too long. Mythcomm takes advantage of the...

This paper examines the problems of applying traditional function points count rules to virtual reality systems (VRS). From the analysis of the differences between traditional and VRS systems, a set of deficiencies in the IFPUG 4.1 function points count method was detected. Due to the increasing importance of these kinds of applications, it is necessary to study how traditional function points ...

In this paper we offer a formal account of reasoning with legal cases in terms of argumentation schemes. These schemes, and undercutting attacks associated with them, are formalised as defeasible rules of inference within the ASPIC+ framework. We begin by modelling the style of reasoning with cases developed by Aleven and Ashley in the CATO project, which describes cases using factors, and then...

Most applications of data envelopment analysis (DEA) employ standard constant or variable returns-to-scale (CRS or VRS) models. In this paper we suggest that these models may sometimes underutilize our knowledge of the underlying production process. For example, in the context of higher education considered in the reported application, individual universities often maintain a certain student-to...