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Quality of Service o ers Real Time Systems guarantees the time constraints of applications such as electronic commerce, video conferencing, telemedicine, among others that need reliable and e ective performance for their services. Contributions in these areas have made the provision of service quality in absolute terms, out of a maximum average time of service for Web applications. However, quality control based on average response time for the entire period of service, does not restrict the response time to their dispersion. A reasonable average value may be the result of the combination of response times of high and low. Objective of this research is reduce the delays dispersion in systems scheduled with policy EBS (Exigency Based Scheduling), de ned by the positive di erence between the response time of user request and the average contract value, in a model contract by a sliding operation windows. The EBS is a scheduling policy that de nes a contracts model for an average response time evaluated throughout the time of service. We analyze the delays dispersion because it is preferable that there is the possibility of response time becomes substantially below the average contracted. Results are obtained using simulation methods of the algorithms developed during the project.

Reduzindo a dispersão dos atrasos em sistemas de tempo real soft com restrições de média de tempo de resposta