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Context-aware applications often consist of a middleware and a collection of services, and run autonomously adaptive to changing environments with sensors installed in physical facilities and end-users moving around. Testing such applications is challenging due to the complex interactions with the environments. This paper proposes a model-based testing approach that extends a bigraphical sorting predicate...
Context-aware systems provide proactive services for users based on environment contexts reasoning. This paper proposes context-aware systems, and addresses the important issues of modeling and evolutionary context rules. Service modeling is based on ontology technology to describe context-aware systems, and service reasoning rules are constantly extracted and evolved using tough-set theory by accommodating...
Two important aspects are associated with service composition. One is to understand the needs and constraints for a new added-value composite service, and otherwise it would lead to an ad-hoc effort for service composition. The second is to reflect the changes of computing environment to the service composition to catch up the on-demand of users. This paper introduces a goal-driven approach to specify...
Dynamic service composition requires responding and adapting to changes in the computing environment when orchestrating existing services into one or more new services that fit better to a composite application. This paper abstracts the changes of the environment as a context world to store the physical contexts of the computing environment, user profiles and computed results of services as well....
Service discovery is one of the key tasks in SOA, locating a particular or a series of services by matching a user query with service advertisement in service repository. It’s crucial to the automation and intelligence of service invocation, achieving better user-experience of QoS. However, key-word based syntactic matchmaker currently fails to provide a satisfied service discovery mechanism. Therefore,...
In pervasive computing environment, service discovery plays an important role for automatically locating and executing the most suitable services according to related contextual information to fulfill user requirements. Current service discovery mechanisms rarely take context into consideration, leading to poor user experiences. In this paper, we propose an approach to service discovery that makes...
Service-oriented architecture (SOA) is a new paradigm, where it is imperative to automatically adapt to the changing context in the environment. This paper applies context awareness to service-oriented architecture to build reusable, adaptable, spontaneous and flexible context-awareness systems. We develop an ontology based context model, and domain-analyst oriented context reasoning rules, which...
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