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Web services which allow the interoperability and communication of heterogeneous systems in the Web through Internet protocols, are also subject to attacks a well as destructive as sophisticated. Contrariwise, very few solutions exist to ensure the availability of Web services in the presence of these attacks. In order to tackle these issues, we propose a comprehensive and complete attack-tolerance...
The efforts and findings of the last decades of research on the formalization and the verification of Web services have given a certain level of assurance on Web services. However new challenges such as high availability and security issues are not fully addressed. In fact, Web services are exposed to attacks that appear continuously. These issues have naturally paved the way to a new research topic...
Privacy is an important issue that has raised particular concerns among many research areas. This issue dramatically increases with the proliferation of the Web services composition paradigm. This is mainly due to the high dynamism and untrustworthiness characteristics of the services to be composed, which impose high levels of risk on the interacting parties. Existing technologies for managing and...
This chapter presents a universal architecture for porting legacy code to Web service environments. We provide a detailed analysis of the proposed solution and characterize it in the context of fundamental Grid requirements. The architecture is evaluated on the basis of such criteria like performance, security, scalability, and fault tolerance. Our solution provides support for process migration,...
Nowadays, the rapidly changing Information and Communication Technologies bring new opportunities to the e-learning field. One of these opportunities is the use of LMS (Learning Management System) platforms. LMSs have to be able to interact with external applications and thus reconfigure their functionalities. In this context, the present paper aims at proposing an approach for integrating external...
In real life, a tester can only afford to apply one test case prioritization technique to one test suite against a service-oriented workflow application once in the regression testing of the application, even if it results in an adverse scenario such that the actual performance in the test session is far below the average. It is unclear whether the factors of test case prioritization techniques known...
Many web services represent their artifacts in the semi-structural format. Such artifacts may or may not be structurally complex. Many existing test case prioritization techniques however treat test cases of different complexity generically. In this paper, we exploit the insights on the structural similarity of XML-based artifacts between test cases, and propose a family of test case prioritization...
WS-BPEL has been adopted as the predominant method for composing individual web services into higher-level business processes. The designers of WS-BPEL scenarios define at development time the specific web services that will be invoked in the context of the business process they model; in the context however of the current web, where each functionality is offered by multiple service providers, under...
Efficiently locating learning content and web services for adaptive and personalized online courses is a demanding research area. This paper identifies the key challenges that need to be addressed. An approach is then presented that empowers educators to locate relevant learning resources and services through domain expertise and semantics that are meaningful to them. This approach utilizes the existing...
Contrary to simple Web content, standard Web services do not offer their clients the possibility to use cached information without the risk that it may be out-of-date. This feature has not been worth its costs in realistic Web service usage scenarios until now. However, its absence may pose restrictions and impede possible benefits in a future scenario, where mediators are both willing and able to...
A promising way to guarantee dependability of service-based systems (SBSs) is replanning service bindings dynamically with the environment changing. As embedded into system execution, such replanning process will directly affect the overall performance of SBSs. While various replanning techniques have been proposed up to now, it is still challenging that how to provide cost-effective replanning methods...
Nowadays, we are assisting to a paradigmatic shift for the development of web applications due to the pervasive distribution of their components among a lot of servers, which are dynamically interconnected by web links. As a consequence, the application logic is often defined by exploiting workflow languages since they are more suitable to address the complexity of these new running environments....
The expanding IPTV (Internet Protocol Television) market has begun to include the next generation IPTV services for new user experiences. And Open IPTV is one of the very important next services for the subscribers who want the chance to experience more various contents and services easily. This paper presents a policy-based service overlay IPTV framework for open strategy. We suggest that subscribers...
Due to the dynamic nature of environment in service computing, it becomes more important to make the Web service composition able to self-adapt to changes in its environment. Achieving this goal is a challenging task, as the performance of a composite Web service will be decreased if the adaptation happens frequently in runtime. In this paper, we improve adaptation of Web service composition by predicting...
We observe two of the recent trends in information technology. Cloud Computing (CC) is widely accepted as an effective reuse paradigm. Mobile Computing with Mobile Internet Device (MID) such as iPhones and Android devices becomes a convenient alternative to personal computers by integrating mobility, communication, software functionality, and entertainment. Due to the resource limitations of MIDs,...
Mobile Web services lie on the intersection of two big IT trends, namely Service-oriented Architectures (SOA) and mobile applications. So, their usage is likely to expand dramatically in the next years. However, the heavyweight nature of service-orientation in terms of the messaging-overhead that is necessary in order to achieve interoperability and loose-coupling comes in contrast with the lightweight...
Web services composition environment is highly dynamic with new services being deployed, existing ones becoming unavailable or their QoS and other non-functional properties (cost, availability, etc.) changing dynamically. However, current approaches for web services composition and execution, such as WS-BPEL, can neither tailor the execution automatically as per the required QoS nor can they adapt...
Workflows have been used to model repeatable tasks or operations in a number of different industries including manufacturing and software. In this paper we examine the use of workflows to model the interaction of services that can be found in intelligent environments to support user tasks and goals. The deployment of such workflows needs to take care special design considerations, including context...
Services discovery, selection, composition, verification, and adaptation are important in service-oriented computing. Existing researches often study techniques to maximize the benefits of individual services. However, following the power laws, a small fraction of quality services offers their executions to support a significant portion of all service requests. We argue that locating and maintaining...
Adaptive and reconfigurable service provisioning is a promising research direction for NGN service technologies. It will lay the foundation of a converged network environment, in which users can feel free to enjoy various advanced services. In this paper we propose a new Adaptive Service Provisioning Architecture(ASPA) applicable to NGN. The architecture is composed of five subsystems enriching the...
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