Yannis Kalfoglou

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In order to tackle the need of sharing knowledge within and across organisational boundaries, the last decade has seen researchers both in academia and industry advocating for the use of ontologies as a means for providing a shared understanding of common domains. But with the generalised use of large distributed environments such as the World Wide Web came(More)
As ontologies become ever more important for semanticallyrich information exchange and a crucial element for supporting knowledge sharing in a large distributed environment, like the Web, the demand for sharing them increases accordingly. One way of achieving this ambitious goal is to provide mechanised ways for mapping and merging ontologies. This has been(More)
Query formulation is a key aspect of information retrieval, contributing to both the efficiency and usability of many semantic applications. A number of query languages, such as SPARQL, have been developed for the Semantic Web; however, there are, as yet, few tools to support end users with respect to the creation and editing of semantic queries. In this(More)
We address what is still a scarcity of general mathematical foundations for ontology-based semantic integration underlying current knowledge engineering methodologies in decentralised and distributed environments. After recalling the first-order ontology-based approach to semantic integration and a formalisation of ontological commitment, we propose a(More)
In this results report we summarize our experiences from running the CROSI Mapping System (CMS) over three test cases for this year’s OAEI contest: bibliography, Web directories and medical ontologies alignment case studies. CMS successfully parsed and aligned all input ontologies in all three case studies. We also elaborate on the insights gained and(More)
Enabling trust on the Semantic Web to ensure more efficient agent interaction is an important research topic. Current research on trust seems to focus on developing computational models, semantic representations, inference techniques, etc. However, little attention has been given to the plausible trust strategies or tactics that an agent can follow when(More)
We elaborate on the mathematical foundations of the meaning coordination problem that agents face in open environments. We investigate to which extend the Barwise-Seligman theory of information flow provides a faithful theoretical description of the partial semantic integration that two agents achieve as they progressively align their underlying ontologies(More)
In this paper we present myPlanet, an ontologydriven personalised Web-based service. We extended the existing infrastructure of the PlanetOnto news publishing system. Our concerns were mainly to provide lightweight means for ontology maintenance and ease the access to repositories of news items, a rich resource for information sharing. We reason about the(More)
In the context of the Semantic Web, many ontology-related operations, e.g. ontology ranking, segmentation, alignment, articulation, reuse, evaluation, can reduced to one fundamental operation: computing the similarity and/or dissimilarity among ontological entities, and in some cases among ontologies themselves. In this paper, we review standard metrics for(More)