The transmission of video over a high-speed network implies guaranteeing a Quality of Service (QoS). This transmission requires a very demanding reservation of network resources, so optimisation becomes a key issue. Traffic shaping has been proposed as a means for improving network utilisation. This paper introduces a fast and bounded method to obtain the leaky bucket shaper parameters that opt...

This paper presents a network with earliest deadline first (EDF) scheduling on a per slot basis. The network is called CCR-EDF (Control Channel based Ring network with EDF scheduling). The topology is a pipelined unidirectional fibre-ribbon ring that supports several simultaneous transmissions in non-overlapping segments and with dedicated fibres for clock and arbitration. In each slot the node...

This paper presents a sensitivity analysis for the dimensioning of real-time systems in which sporadic tasks are executed according to the preemptive Earliest Deadline First (EDF) scheduling policy. The timeliness constraints of the tasks are expressed in terms of late termination deadlines. A general case is considered, where the task deadlines are independent of the task sporadicity intervals...

Real-time communication with performance guarantees is becoming very important to many applications, like computer integrated manufacturing, multimedia, and many embedded systems. Though several real-time protocols have been proposed for the multiple access bus networks, there is no guarantee based protocol which addresses the problem of integrated scheduling of dynamically arriving periodic an...

The earliest-deadline-first (EDF) scheduling algorithm, while not optimal for globally-scheduled hard real-time systems, can support any feasible task system with bounded lateness. Furthermore, global-EDF-like (GEL) scheduling algorithms, which prioritize jobs by assigning them fixed priority points based on per-task relative priority points, have been shown to share this same property. Some su...

In this paper, we validate the performance of the MKMV EDF credit measure in its timeliness of default prediction, ability to discriminate good firms from bad firms, and accuracy of levels, with a focus on U.S. markets. We focus on the period 1996-2004 for most of our tests. Wherever possible, we compare the performance to that of other popular alternatives like agency ratings, Z-Scores, and a ...

BACKGROUND Whether and to what extent young adults are aware of the adverse impact of eating disorder features (EDF) on psychosocial functioning is unclear, although such awareness may affect the experience and behavior of sufferers. The aim of the current study was to examine young adults' perceptions of psychosocial impairment associated with EDF, and the potential effect on these perceptions...

Several approximations occur during a numerical simulation: physical effects mapy be discarded, continuous functions replaced by discretized ones and real numbers replaced by finite-precision representations. The use of the floating point arithmetic generates round-off errors at each arithmetical expression and some mathematical properties are lost. The aim of the numerical verification activit...

A packet scheduler in a quality-of-service (QoS) network should be sophisticated enough to support stringent QoS constraints at high loads, but it must also have a simple implementation so that packets can be processed at the speed of the transmission link. The Earliest-DeadlineFirst (EDF) scheduler is the optimal scheduler for bounded-delay services in the sense that it provides the tightest d...