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In distributed environments it is necessary to provide tools that describe and guarantee the level of Quality of Service of the provided services. These guarantees can be specified in terms of Service Level Agreements (SLAs), which in turn can be used for the management and monitoring of Quality of Service attributes. The provided services supply the appropriate interfaces through which the service...
In wireless sensor networks, a sensor node, besides being able to act on the environment, is also a network entity that performs networking-related functionalities and could be integrated within the networking and grid environment. In this chapter, we adopt a probabilistic approach that presents a robust and generalized framework for performing in-network processing in order to improve the overall...
In this paper a novel reputation-based trust framework in federated testbeds is presented, termed as Federated Trust and User Experience (FTUE) Framework. Our aim is to assist peer experimenters in properly selecting resources from the federated community by constructing a quantitative view of the trustworthiness of each testbed. The FTUE framework combines the perceived user experience, as provided...
In this paper a novel data gathering framework for resource-constrained sensor networks is introduced and evaluated. The introduced framework consists mainly of two phases. Initially, due to the lack of infrastructure, a simple bridging technique is used to create a multi-hop tree rooted at the collection center. In the second phase, a distributed and probabilistic method is applied by the various...
We present a distributed systems architecture that uses Grid computing to combine basic nodes of wireless sensor networks with complex sensor nodes of wired networks. Three kinds of complex sensor nodes are identified: objects, agents and containers. The decision making capabilities of the complex nodes are then combined with a quality of service (QoS) framework for gathering data from the wireless...
In this paper the problem of efficient data aggregation and report delivery in QoS-constrained distributed sensor networks is investigated. An analytical statistical model is introduced, to represent the data aggregation and report delivery process in sensor networks, with specific delivery quality requirements in terms of the achievable end-to-end delay and the successful report delivery probability...
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