Abstract Ontology Based Data Access (OBDA) is a prominent approach to query databases
which uses an ontology to expose data in a conceptually clear manner by abstracting away …

Abstract Knowledge graphs such as Yago and Freebase have become a powerful asset for
enhancing search, and are being intensively used in both academia and industry. Many …

We present a description and analysis of the data access challenge in Siemens Energy. We
advocate Ontology Based Data Access (OBDA) as a suitable Semantic Web driven …

The paper describes the organization of the unified information space which is based on the
uniform principles and the general rules that ensure the informational interaction of objects …

Faceted search is a prominent search paradigm that became the standard in many Web
applications and has also been recently proposed as a suitable paradigm for exploring and …

The success of the use of ontology-based systems depends on efficient and user-friendly
methods of formulating queries against the ontology. We propose a method to query a class …

Abstract Knowledge graphs such as Yago and Freebase have become a powerful asset for
enhancing search, and are being intensively used in both academia and industry. Many …

In this demo we present the SemFacet system for faceted search over ontology enhanced
Knowledge Graphs (KGs) stored in RDF. SemFacet allows users to query KGs with relatively …

This master project investigates the possibilities of having a natural language query
formulation system where users will be able to specify an initial version of a query. Instead of …

Περίληψη Ένα βασικό πεδίο έρευνας της επιστήμης των υπολογιστών είναι η αναπαράσταση
γνώσης, καθώς και η γρήγορη και αποδοτική συλλογιστική σε αυτήν. Η οικογένεια των …