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In this paper we study the case of situational reasoning on ontological descriptions in context-aware applications. We therefore discuss the logical foundations of W3C’s standard ontology language OWL and examine how this modeling language can be used to express a user’s situation. In a practical scenario and through the use of standard Semantic Web(More)
Currently available mobile devices lack the flexibility and simplicity their users require of them. To start with, most of them rigidly offer impoverished, traditional interactive mechanisms which are not handy for mobile users. Those which are multimodal lack the grace to adapt to the current task and context of their users. Some of the reasons for such(More)
— Recent advances in the field of context reasoning and in wireless information devices, which allow mobile access and provide a multitude of context information , have enabled the provision of new, context-aware applications and services. The architecture framework described in this paper provides a very flexible approach to implementing different(More)
We present the Context Watcher, a mobile application that enables mobile phone users to easily and unobtrusively share personal context data such as their location, heart rate, speed, or view, with their mutual consent. Not only can the data be shared, it can also be used as input for information services, to adapt applications to the context, or to(More)