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The fast expansion of Internet-based multimedia services like Netflix, Skype or YouTube -- the so-called Over-The-Top Services (OTT) -- have increased the quality requirements of these services from the point of view of the user. In this sense, it is important not only to ensure a good Quality of Service (QoS) level -- technical metrics -- but also a high level of Quality of Experience (QoE) -- subjective,...
A Service Level Agreement (SLA) is a contract between a service provider and a consumer which specifies in detail the level of service expected from the service provider, obligations, commitment and objectives. In the cloud computing environment, both the cloud provider and the cloud consumer want to know of a likely service violation before the actual violation occurs and to adjust the scaling of...
The common way to purchase computing capacity is to acquire a fix amount of servers which are hosted in a data center. The reserved amount of resources depends on the maximum demand that could occur. This over provisioning of resources is associated with high costs. Cloud providers promise to reduce the costs while guaranteeing always a good performance for the outsourced services. A reducing of the...
Distributed environments hosting specific and dedicated computing resources are serving nowadays more and more scientific and commercial applications. Finding the right resource in distributed environments in term of performance is not an obvious task. This paper is addressing the issue of selecting the right service deployed in a distributed environment for any applications or workflow engines that...
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