Representation of context-dependant knowledge in ontologies: A model and an application
Expert Systems with Applications: An International Journal
M-PAC '09 Proceedings of the International Workshop on Middleware for Pervasive Mobile and Embedded Computing
A context-aware middleware for real-time semantic enrichment of distributed multimedia metadata
Multimedia Tools and Applications
ISWC'06 Proceedings of the 5th international conference on The Semantic Web
Review: Mobile guides: Taxonomy of architectures, context awareness, technologies and applications
Journal of Network and Computer Applications
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The use of Description Logics (DLs) in modeling various real-world domains, and reasoning about them, has wellknown benefits. We believe that the same framework can be used for representing a user-centric view of usage contexts. A DL-reasoner can then be used for organizing context definitions, merging domain knowledge into these definitions, and performing recognition of contexts from sensor inputs. A pure DL-based approach, however, has certain limitations in a context environment; hence, a hybrid reasoning approach is proposed. To ensure syntactic and semantic interoperability, we adopt a Semantic Web -compliant approach that uses the OWL-DL variant of the OWLWeb Ontology Language. This allows us to aggregate various heterogeneous data sources, both directly in Semantic Web formalisms, and indirectly via the use of a transformation framework capable of using data from legacy applications. Context and domain models, along with associated reasoners, are themselves context, user and/or organizationspeci fic; hence multiple systems should be maintained and connected into a distributed architecture. In order to deploy this architecture in a mobile environment, an underlying SIP-based provisioning framework has been experimented with, enabling device, network and location transparency.