German Nemirovski

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In recent years the core of the semantic web has evolved into a conceptual layer built by a set of ontologies mapped onto data distributed in numerous data sources, interlinked, interpreted and processed in terms of semantics. One of the central issues in this context became the federated querying of such linked data. This paper presents the federated query(More)
Methods to design of formal ontologies have been in focus of research since the early nineties when their importance and conceivable practical application in engineering sciences had been understood. However, often significant customization of generic methodologies is required when they are applied in tangible scenarios. In this paper, we present a(More)
In the last years ontologies have been applied increasingly as a conceptual view facilitating the federation of numerous data sources using different access methods and data schemes. Approaches such as ontology-based data integration (OBDI) are aimed at this purpose. According to these approaches, queries formulated in an ontology describing the knowledge(More)
This paper presents Map-On, a web-based editor for visual ontology mapping developed at the Architecture, Representation and Computation research group of the La Salle at Ramon Llull University. The Map-On editor provides a graphical environment for ontology mapping creation based on the representation of mapping using an interactive graph layout. Thus, a(More)
The dataset presented in this paper constitutes one of the outcomes of RÉPENER, a research project co-funded by the Spanish National RDI plan. It contains integrated information of the Spanish territory regarding energy certification, building monitoring, and geographical data. The integration has been carried out by means of semantic technologies. The(More)
In recent years a lot of effort has been put into research dealing with accessing relational data with the help of ontologies. Solutions related to this issue focus on the Ontology-based Data Access (ODBA) architecture. Therefore the family of DL-Lite formalisms and in particular DL-LiteA has been developed to enable ontology design for efficient processing(More)
The federation of different data sources gained increasing attention due to the continuously growing amount of data. But the more data are available from heterogeneous sources, the higher is the risk of inconsistency. To tackle this challenge in federated knowledge bases, we propose a fully automated approach for computing trust values at different levels(More)
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