Jelle Hellings

I am a PhD student and teaching assistant at Hasselt University in Belgium, and a member of the Databases and Theoretical Computer Science Research Group.

Papers

DBPL 2015
Relative Expressive Power of Downward Fragments of Navigational Query Languages on Trees and Chains (paper, local version, slides). Jelle Hellings, Marc Gyssens, Yuqing Wu, Dirk Van Gucht, Jan Van den Bussche, Stijn Vansummeren, George H. L. Fletcher. The 15th International Symposium on Database Programming Languages (DBPL 2015). 2015.
AMAI 2015
Implication and axiomatization of functional and constant constraints (paper, local version). Jelle Hellings, Marc Gyssens, Jan Paredaens, Yuqing Wu. Annals of Mathematics and Artificial Intelligence. 2015. (see also: FoIKS 2014).
arXiv.org 2015
Path Results for Context-free Grammar Queries on Graphs (local version, arXiv.org). Jelle Hellings.
ICDT 2014
Conjunctive Context-Free Path Queries (paper, via OpenProceedings, local version, slides). Jelle Hellings. The 17th International Conference on Database Theory (ICDT 2014). 2014.
FoIKS 2014
Implication and Axiomatization of Functional Constraints on Patterns with an Application to the RDF Data Model (paper, local version, slides). Jelle Hellings, Marc Gyssens, Jan Paredaens, Yuqing Wu. Eighth International Symposium on Foundations of Information and Knowledge Systems (FoIKS 2014). 2014. (see also: AMAI 2015).
ICDT 2013
Walk Logic as a framework for path query languages on graph databases (paper and paper, via ICDT 2013 Conference Program, local version, slides). Jelle Hellings, Bart Kuijpers, Jan Van den Bussche, Xiaowang Zhang. The 16th International Conference on Database Theory (ICDT 2013). 2013.
SIGMOD 2012
Efficient external-memory bisimulation on DAGs (paper, local version, slides, poster, arXiv.org version, project page). Jelle Hellings, George H. L. Fletcher, Herman Haverkort. ACM SIGMOD International Conference on Management of Data (SIGMOD 2012). 2012. (see also: DBDBD 2011 and Master Thesis).

Talks

WOG 2013
Path Querying on Graph Databases (slides, abstract, short abstract). Jelle Hellings. WOG 2013.
DBDBD 2011
Efficient external-memory bisimulation on DAGs (abstract, slides, project page). Jelle Hellings. DBDBD 2011. (see also: SIGMOD 2012 and Master Thesis).

Others

Master Thesis
Bisimulation partitioning and partition maintenance (report, local version, midterm presentation slides, final presentation slides, project page, poster). Jelle Hellings under supervision of George H. L. Fletcher. Eindhoven University of Technology (TU/e). (see also: SIGMOD 2012 and DBDBD 2011).