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Papers by maha driss

Lecture Notes in Computer Science, 2010

As we described in Chapter 1, Services are often provisioned within short-term, volatile and high... more As we described in Chapter 1, Services are often provisioned within short-term, volatile and highly dynamic (business) processes. These processes are designed in an abstract manner and when instantiated can involve service providers not known of during the design time of the service-based application. Thus, different from traditional software systems, service-based applications require the composition and coordination of services within highly distributed environments, cutting across the administrative boundaries of various ...

Ingénierie des systèmes d'information, 2010

Cet article présente une approche centrée exigences pour la composition de services web qui perme... more Cet article présente une approche centrée exigences pour la composition de services web qui permet : (i) la modélisation des exigences des utilisateurs avec le formalisme la Carte et la spécification des services requis avec un modèle intentionnel de services (MIS) ; (ii) la découverte des services web pertinents en interrogeant le moteur de recherche de services Service-Finder ; (iii) la sélection automatique de services pertinents et de haute QdS par l'application de l'analyse formelle de concepts (AFC) ; et (iv) la génération automatique de processus de coordination BPEL par l'application de la technique de transformation de modèles. Dans cet article, nous illustrons notre approche par une application d'arrangement de conférences et nous la validons empiriquement en termes de précision et de rappel sur cette application.

One of the promises of the Service-Oriented Architecture (SOA) is to build complex added-value se... more One of the promises of the Service-Oriented Architecture (SOA) is to build complex added-value services in order to enhance and extend existing ones. Service-Based Applications (SBAs) are asked not only to perform required functionalities, but also to deliver expected level of Quality of Service (QoS). Dealing with QoS management of such distributed applications, which are executed in dynamic environments, raises the need to consider context characteristics. This paper proposes a discrete-events simulation approach which assures the evaluation of SBAs performance under different context status. The main contributions of this paper are: (i) the discrete-events modeling approach for SBAs, (ii) the context-based model for SBAs considered in the discrete-events simulation model, and (iii) the evaluation of a set of QoS metrics by simulation.

Service-Oriented Computing (SOC) has gained considerable popularity for implementing Service-Base... more Service-Oriented Computing (SOC) has gained considerable popularity for implementing Service-Based Applications (SBAs) in a flexible and effective manner. The basic idea of SOC is to understand users' requirements for SBAs first, and then discover and select relevant services (i.e., that fit closely functional requirements) and offer a high Quality of Service (QoS). Understanding users' requirements is already achieved by existing requirement engineering approaches (e.g., TROPOS, KAOS, and MAP) which model SBAs in a requirement-driven manner. However, discovering and selecting relevant and high QoS services are still challenging tasks that require time and effort due to the increasing number of available Web services. In this paper, we propose a requirement-centric approach which allows: (i) modeling users' requirements for SBAs with the MAP formalism and specifying required services using an Intentional Service Model (ISM); (ii) discovering services by querying the Web service search engine Service-Finder and using keywords extracted from the specifications provided by the ISM; and(iii) selecting automatically relevant and high QoS services by applying Formal Concept Analysis (FCA). We validate our approach by performing experiments on an e-books application. The experimental results show that our approach allows the selection of relevant and high QoS services with a high accuracy (the average precision is 89.41%) and efficiency (the average recall is 95.43%).

Ingénierie des systèmes d'information, 2011

Proceedings of the 13th International Conference on Information Integration and Web-based Applications and Services - iiWAS '11, 2011

The new paradigm for distributed computing over the Internet is that of Web services (WSs). One o... more The new paradigm for distributed computing over the Internet is that of Web services (WSs). One of the key ideas of this new paradigm is the ability to create value-added Service-Based Applications (SBAs) by composing pre-existing services. Building SBAs necessitates the discovery and the selection of the most appropriate WSs that fit closely users' functional and non-functional requirements. Due to the large number of WSs that are advertised over public and private registries and the various functional and non-functional capabilities that are required by users, discovery and selection of WSs have become a real challenge nowadays. In this paper, we present a WS composition approach that is built upon both perspectives: intentional and operational. In the intentional perspective, we propose to model users' requirements for SBAs using the MAP formalism and specify the required WSs using an Intentional Service Model (ISM). In the operational perspective, we propose to discover the required WSs by querying the service search engine Service-Finder and select the most appropriate WSs by using many-valued concept lattices. To validate our approach, we use an analytical technique that is the monitoring to verify that the selected WSs assure the required users' non-functional capabilities.

2011 IEEE International Conference on Web Services, 2011

Building a composite application based on Web services has become a real challenge regarding the ... more Building a composite application based on Web services has become a real challenge regarding the large and diverse service space nowadays. Especially when considering the various functional and non-functional capabilities that Web services may afford and users may require.