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Reselection of composition service is one of the core research issues in the service computing field. Most of the existin-g researches for this problem are based on the assumption that the tasks involved are independent. However, in practical scenar-ios, the QoS of some candidate services have correlations with other services, which makes the corresponding tasks be correlated with each other. This...
One important step in dynamic web service composition is to bind concrete web services to the activities involved in the composition. Ideally, the component services are assigned such that the resulting composite web service meets the service level agreements and offers the best trade-off between the various QoS parameters. This implies the ability to express preferences related to the trade-offs...
Quality of Service (QoS) aware service selection of workflows is a very important aspect for service-oriented systems. The selection based on QoS allows the user to include also non-functional attributes in their query, such as availability and reliability. Several exact methods have been proposed in the past, however, given that the workflow selection problem is NP-hard, approximate algorithms can...
The Web service composition (WSC) has been widely used in Service-Oriented Architecture (SOA), which is an effective integration of the distributed and heterogeneous business applications. In contrast to the component-based software, dynamic reconfiguration occurs more frequently in Web services-based software for self-adapting and self-managing their computing capabilities due to the uncertainty...
Based on service oriented infrastructures, there are many services that provide the same functionality but differ in quality parameters. An important issue for web services composition is how to select appreciates services from a set of alternatives with QoS features being considered. We define a Petri net model - WS_QPN to computer the QoS values of composite services. Since finding a solution for...
Web service is a kind of interface to achieve communication between the isolated information. It can be described, released, finded and invoked through Web. SLA (service level agreement) provides a formal contract between service provider and consumer after negotiation, which states the quality, priority and obligation of the service. This paper proposed an SLA based Web service quality monitor system...
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