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Reducing traffic in DHT-based discovery protocols for dynamic resources,ying assumption is that the arrival ratio of lookup queries is higher than the ratio of resource publication operations. We propose a set of optimization strategies to reduce the network traffic generated by the data publication and update process when resources have dynamic-valued attributes. We ai

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Autonomic management of multiple non-functional concerns in behavioural skeletons,rchical composition of behavioural skeletons. We first define the problems arising when multiple concerns are dealt with by independent managers, then we propose a methodology supporting coordinated management, and finally we discuss how autonomic management of multiple concerns may be implemented i

Autobiography

Decision Models for Resource Aggregation in Peer-to-Peer Architectures,to study. While previous work investigated the effectiveness of resource aggregation in unstructured peer-to-peer networks with autonomous nodes, in this paper we investigate several sorts of decision models for this task. By extensive experimentation, we find that a good decision model can further

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A Proposal on Enhancing XACML with Continuous Usage Control Features,and continuity of control..OASIS eXtensible Access Control Markup Language (XACML) [10] is a widely-used language to write authorization policies to protect resources in a distributed computing environment (e.g. Grid). The XACML policy specifies beforeusage authorization process optionally complemen

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Self-* and Adaptive Mechanisms for Large Scale Distributed Systems, composed of a large number of autonomous entities. The complexity of these systems is such that human administration is nearly impossible and centralized or hierarchical control is highly inefficient. These systems need to run on highly dynamic environments, where content, network topologies and wo

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Research Challenges in Managing and Using Service Level Agreements,ontain Quality of Service properties that must be maintained by a provider, and as agreed between a provider and a user/client. These are generally defined as a set of Service Level Objectives (SLOs). These properties need to be measurable and must be monitored during the provision of the service th