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In order to accurately forecast Quality of Service (QoS) of different Web Services, this paper proposes a novel QoS forecasting approach called MulA-LMRBF (Multi-step fore-casting with Advertisement and Levenberg-Marquardt improved Radial Basis Function) based on multivariate time series. Considering the correlation among different QoS attributes, we use phase-space reconstruction to map historical...
In the service-oriented architecture, component services can be composed to provide value-added services. The notion of composite service skyline facilitates obtaining a QoS-optimal service combination. State-of-the-art approach to computing composite service skyline assumes that candidate services of different tasks are independent. However, real-word services are usually QoS-correlated. To this...
Currently, the number of Web services on the Internet is growing exponentially. Faced with a large number of functionally equivalent candidate services, users always hope to select the optimal one that can provide the best QoS values. However, users usually do not know the QoS values of all the candidate services as the limited historical service invocation records. Different QoS prediction methods...
Timed properties are an important quality criterion in Business-to-Business (B2B) Web service compositions. To guarantee the correctness of these compositions, the deadlock freeness as well as some non-functional properties such as timed constraints should be satisfied. Since there are some recent research efforts concerning the correctness of service composition from the structural and behavioral...
The execution time, an important criterion to measure the quality of a BPEL process, can be influenced by some slow external partner services (i.e., some long-running services). Therefore, it is desirable to specify response time of services into the SLAs (service level agreements). In this way, service consumers could verify whether the candidate services satisfy the expected time requirements before...
As specified by the third-generation (3G) wireless networks such as the universal mobile telecommunication system (UMTS), interactive data services, such as Web browsing, voice messaging, and file transfer, represent a major service class in operation nowadays. In this paper, we develop an analytical approach to evaluate the performance of interactive data services under sharing and preemptive scheduling...
Generally, service composition and its evaluation are initiated by web services' functional and non-functional attributes. To select qualified services and compose them into a service composition framework manually is time-consuming and error-prone. In practice, it is a challenging endeavor to timely discover qualified services and develop a service composition schema. In view of this challenge, a...
Facing changing environments and evolving business rules, composite services ought to be adaptable, even at run-time. Existing mainstream service composition languages and execution engines exhibit insufficient support for variability and adaptability to cater for dynamic changes. Research efforts have been put on the extension of the languages and argumentation of the engines. However, how to ensure...
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