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The Dem@Care Context Descriptor ontology has been integrated in the Linked Open Vocabularies (LOV) dataset, enabling its sharing and reuse by other datasets in the Linked Data Cloud (a human-readable description of the vocabulary is available here). The ontology has been developed in the framework of the Dem@Care project and provides the vocabulary to annotate complex (high-level) activity classes with low-level observations for complex activity recognition.
For more details, please refer to the relevant paper: G. Meditskos, E. Kontopoulos, I. Kompatsiaris, "Knowledge-driven Activity Recognition and Segmentation Using Context Connections", International Semantic Web Conference (ISWC), pp. 260-275, Riva del Garda, Trento, Italy, 19-23 October 2014