Cabot: On the Ontology for the Middleware Support of Context-Aware Pervasive Applications
نویسندگان
چکیده
Middleware support is a major topic in pervasive computing. Existing studies mainly address the issues in the organization of and the collaboration amongst devices and services, but pay little attention to the design support of context-aware pervasive applications. Most of these applications are required to be adaptable to dynamic environments and self-managed. However, most contextaware pervasive applications nowadays have to carry out tedious tasks of gathering, classifying and processing messy context information due to lack of the necessary middleware support. To address this problem, we propose a novel approach based on ontology technology, and apply it in our Cabot project. Our approach defines a context ontology catered for the pervasive computing environment. The ontology acts as the context information agreement amongst all computing components to support applications with flexible context gathering and classifying capabilities. This allows a domain ontology database to be constructed for storing the semantics relationship of concepts used in the pervasive computing environment. The ontology database supports applications with rich context processing capabilities. With the aid of ontology technology, Cabot further helps alleviate the impact of the naming problem, and support advanced user space switching. A case study is given to show how Cabot assists developers in designing context-aware pervasive applications.
منابع مشابه
Context-aware Modeling for Spatio-temporal Data Transmitted from a Wireless Body Sensor Network
Context-aware systems must be interoperable and work across different platforms at any time and in any place. Context data collected from wireless body area networks (WBAN) may be heterogeneous and imperfect, which makes their design and implementation difficult. In this research, we introduce a model which takes the dynamic nature of a context-aware system into consideration. This model is con...
متن کاملA service-oriented middleware for building context-aware services
The advancement of wireless networks and mobile computing necessitates more advanced applications and services to be built with context-awareness enabled and adaptability to their changing contexts. Today, building context-aware services is a complex task due to the lack of an adequate infrastructure support in pervasive computing environments. In this article, we propose a ServiceOriented Cont...
متن کاملA semantic-aware role-based access control model for pervasive computing environments
Access control in open and dynamic Pervasive Computing Environments (PCEs) is a very complex mechanism and encompasses various new requirements. In fact, in such environments, context information should be used in access control decision process; however, it is not applicable to gather all context information completely and accurately all the time. Thus, a suitable access control model for PCEs...
متن کاملA Unified Context Model: Bringing Probabilistic Models to Context Ontology
Ontology is a promising tool to model and reason about context information in pervasive computing environment. However, ontology does not support representation and reasoning about uncertainty. Besides, the underlying rule-based reasoning mechanism of current context-aware systems obviously can not reason about ambiguity and vagueness in context information. In this paper, we present an ongoing...
متن کاملSemantic-based Middleware Solutions to Support Context-Aware Service Provisioning in Pervasive Environments
The dynamicity and heterogeneity that characterize pervasive environments raise new challenges in the design of mobile middleware. Pervasive environments are characterized by a significant degree of heterogeneity, variability, and dynamicity that conventional middleware solutions are not able to adequately manage. Originally designed for use in a relatively static context, such middleware syste...
متن کامل