Abstract. With a rapid development of ubiquitous computing technology in the home and community, users can access information anytime and anywhere via personal devices such as PDA and internet mobile phone. Similarly, more flexible access control is required in the ubiquitous applications. In this paper, we propose a context-aware access control mechanism, which dynamically grants and adapts permissions to users according to the current context. We extend the role-based access control(RBAC) model to deal with the context information in ubiquitous environment. Unlike the traditional RBAC, the proposed access control mechanism can consider context information such as location, time and system resources by the context-aware agent and state checking matrix(SCM).
Service-Oriented Information Technology is a new emerging paradigm. It can drive the development with rapid, low-cost and easy composition of distributed applications in software product. However, it has several problems such as how to identify service and determine service granularity. This paper proposes a solution that identifies service by using ontology in product line. We analyze service identification methodologies and approaches, and then define a service of feature model from various extensions of Feature-Oriented Domain Analysis. To compensate for ambiguity and expression, ontology is used to precisely define relation and type among features. A serviceoriented method for service identification using ontology can identify a service easily and quickly with proper granularity. This method also provides a way of grouping features and evaluating service after refining service candidate. This service-oriented method can make service with suitable granularity, and improve reusability of a service unit for identified service in software product line development.
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