Evgenij Thorstensen

TL;DR: This work presents BootOX, a system that aims at facilitating ontology and mapping development by their automatic extraction i.e., bootstrapping from RDBs, and their experience with the use of BootOX in industrial and research contexts.

TL;DR: In this article, the authors present data access challenges in the data-intensive petroleum company Statoil and their experience in addressing these challenges with OBDA technology, and develop a deployment module to create ontologies and mappings from relational databases in a semi-automatic fashion, and a query processing module to perform and optimize the process of translating ontological queries into data queries and their execution.

TL;DR: This work presents the Partner Units Problem as a novel challenge for optimization methods and presents and evaluates encodings of the problem in the frameworks of answer set programming, propositional satisfiability testing, constraint solving, and integer programming.

TL;DR: The first version of the Optique system customised for the Norwegian Petroleum Directorate's FactPages, a publicly available dataset relevant for engineers at Statoil ASA, is presented.

TL;DR: In this paper, the problem of identifying mapping inconsistency and redundancy, two of the most important anomalies for mappings in OBDA, has been studied, and algorithms and complexity bounds for the decision problems associated with mapping inconsistencies and redundancy have been established.