Picture of Olaf Hartig Olaf Hartig

Senior Associate Professor (Biträdande professor)
Division for Database and Information Techniques
Department of Computer and Information Science (IDA)
Linköping University

Amazon Scholar
Neptune team at Amazon Web Services

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Research Interests

I am interested in problems related to the management of databases and knowledge. My focus in this broad context is on data on the Web (Semantic Web and Linked Data, in particular) and on graph data, as well as on problems in which the data is distributed over multiple, autonomous and/or heterogeneous sources (keywords: federated data management, federated knowledge graphs). Other keywords that appear in some of my work are data provenance and data quality. Regarding all of these topics, my interests range from theoretical foundations (e.g., complexity and expressive power of query languages) all the way to systems-building related research (e.g., efficient storage of datasets and databases, query processing, and query optimization).

News

September 20, 2023: New paper: With my PhD student Shahrzad Khayatbashi and colleague Amin Jalali (Stockholm University) we have a paper titled "Transforming Event Knowledge Graph to Object-Centric Event Logs: A Comparative Study for Multi-dimensional Process Analysis" at ER 2023. We have made available the PDF file camera-ready version of this paper. Additionally, you may look at the PDF file Github repo with an implementation of the transformation defined in the paper.

August 14, 2023: New paper: With my PhD student Sijin Cheng and earlier postdoc Sebastian Ferrada we have a paper titled "Considering Vocabulary Mappings in Query Plans for Federations of RDF Data Sources" at CoopIS 2023. We have made available the PDF file camera-ready version of this paper.

July 15, 2023: New paper: With colleagues of the Distributed Data Management group at the University of Nantes we have a paper titled "FedShop: A Benchmark for Testing the Scalability of SPARQL Federation Engines" at ISWC 2023. We have made available the PDF file camera-ready version of this paper. Additionally, you may look at the PDF file Github repo for FedShop.

July 5, 2023: I will serve as In-Use Track co-chair of the 21st Extended Semantic Web Conference (ESWC), which will take place in May 2024 in Hersonissou, Greece.

May 15, 2023: New paper: With my PhD student Sijin Cheng we have a paper titled "A Cost Model to Optimize Queries over Heterogeneous Federations of RDF Data Sources" at the Data Management for Knowledge Graphs workshop (DMKG) at ESWC 2023. We have made available the PDF file camera-ready version of this paper.

February 22, 2023: I have been invited to deliver a seminar at the Belgian Scientific Research Network on Knowledge Graphs For Data Integration.

December 20, 2022: Our proposal to run the 1st International Workshop on Data Management for Knowledge Graphs (DMKG) at the 20th ESWC Conference in May 2023 has been accepted.

December 6, 2022: I will serve as co-organizer of the GRADES-NDA workshop at the ACM SIGMOD conference next year.

October 31, 2022: According to my Google Scholar profile, I have reached a total of 4000 citations for my publications!

CV

Here is my academic CV: PDF file

Selected Publications

This following list contains selected publications. There is also a complete list of all my publications.

Get in Touch

EMail Address: email address

Office: Building B, Ground floor, Room 2B:478

Postal address: Dept. of Computer and Information Science (IDA), Linköpings universitet, SE-581 83 Linköping, SWEDEN