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With the proliferation of Web services, service engineers demand automatic service composition algorithms that not only synthesize the correct service compositions from thousands of services but also satisfy the quality requirements of users. This is known as QoS-aware automatic service composition problem. Our observation is that current research of only finding the optimal service composition result...
There are various approaches for QoS-based web service composition. However, most of them are concerned about the algorithms of service compositions while ignoring the flexibility and expressiveness of users to set QoS constraints. Most of them assume that users could specify accurate QoS constraints easily. In reality, it is often not true especially for non-expert users. Users may not know the exact...
While the usage of web services has increased explosively in recent years, very few studies examined the characteristics of web services using large-scale real data for a long period of time. In this paper, we present one such a large scale longitudinal analysis of publicly available web services of SOAP-based and RESTful types. For the period of roughly one year and from five different world-wide...
Current QoS-aware automatic service composition queries over a network of Web services are often one-time innature. After a network of Web services is built, such queries are issued once, and answers are found from the scratch. The underlying assumption is that the participating Web services are rather static so that their functional and non-functional parameters seldom change. However, such an assumption...
Automatic service composition has been an active research area in the field of service computing. Service engineers demand algorithms that not only synthesize the correct work plans but also meet the need of the overall qualities like response time, throughput, fee, etc. In this paper, we present a novel QoS-aware approach which adopts a two-phase graph search algorithm. This approach effectively...
With the proliferation of Web services, service engineers demand good automatic service composition algorithms that not only synthesize the correct work plans from thousands of services but also satisfy the quality requirements of the users. Our observation is that conventional approaches suffer from serious limitations in scalability and accuracy when addressing both requirements simultaneously....
Web service policies capture the capabilities and requirements of Web services from both functional and nonfunctional perspectives. Policies of a Web service govern and ensure the runtime consistency of the service, i.e., people or services interacting with this service are only allowed to perform legitimate actions. When composing Web services, policies of the participated Web services have to be...
Automatic service composition has been a hot topic in both academia and industry. It begins with syntactic composition, and then evolves semantic description. QoS of the composition comes into researcherspsila mind, which aims at meeting the need of the overall qualities like service fee, response time, throughput, etc. In this paper, a novel QoS-aware approach is presented. It adopts a forward filtering...
This paper realizes an approach for automatic service composition based on graph search (ASCGS for short). It forms an interoperable directed graph (IDG) by utilizing the interoperable relationships among services, and each request will be inserted temporarily to the graph as a special node, thus the automatic service composition can be implemented by searching of possible directed acyclic graphs...
As our dependence on online services has steadily grown, the development of Web applications is becoming crucial to commercial success of organizations. However, adjusting business vision to new market conditions leads to high volatility in requirements of Web applications. Thus, the organizations require Web systems to update and/or grow at a rate of business requirements change. To address the issue,...
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