Karl Hammar

Head of Department
Assistant Professor
Department of Computing , School of Engineering
PhD

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E2421
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Karl Hammar heads the Department of Computing, and active within the Jönköping AI Lab (JAIL).

Research

Dr Hammar's research focus is on developing and evaluating methods for formal knowledge representation and data integration across heterogenous systems; primarily using Semantic Web technologies such as OWL ontologies and RDF-based knowledge graphs. His most substantial contributions have been the development of simplified ontology engineering methods and tooling (e.g., using ontology design patterns), and the development of the broadly adopted RealEstateCore ontology, supporting data integration in smart buildings.

Biography

Karl holds a PhD in Computer Science from Linköping University. He has participated in several national and international research projects on the topics of knowledge representation and the semantic web; application areas include security and surveillance, veterinary epidemiology, software testing, crime and policing, etc. He has presented his research at leading international conferences such as ISWC, ESWC, EKAW, BIR, etc., and has arranged workshops and seminars within both academia and industry.

Article

Dórea, F., Vial, F., Hammar, K., Lindberg, A., Lambrix, P., Blomqvist, E., Revie, C. (2019). Drivers for the development of an Animal Health Surveillance Ontology (AHSO) Preventive Veterinary Medicine, 166, 39-48.
Alirezaie, M., Hammar, K., Blomqvist, E. (2018). SmartEnv as a Network of Ontology Patterns Semantic Web, 9(6), 903-918.

Book chapter

Blomqvist, E. Hahmann, T. Hammar, K. Hitzler, P. Hoekstra, R. Mutharaju, R. , ... Zhou L. (2021). Preface. In: E. Blomqvist, T. Hahmann, K. Hammar, P. Hitzler, R. Hoekstra, R. Mutharaju, M. Poveda-Villalón, C. Shimizu, M. G. Skjæveland, M. Solanki, V. Svátek, & L. Zhou (Ed.), Advances in Pattern-Based Ontology Engineering (pp. i -viii). Amsterdam: IOS Press
Hammar, K. (2021). Ontology Design Principles for Model-Driven Applications. In: E. Blomqvist, T. Hahmann, K. Hammar, P. Hitzler, R. Hoekstra, R. Mutharaju, M. Poveda-Villalón, C. Shimizu, M. G. Skjæveland, M. Solanki, V. Svátek, & L. Zhou (Ed.), Advances in Pattern-Based Ontology Engineering (pp. 273 -278). Amsterdam: IOS Press
Janowicz, K., Krisnadhi, A., Poveda Villalón, M., Hammar, K., Shimizu, C. (2019). Preface. In: Krzysztof Janowicz, Adila Alfa Krisnadhi, María Poveda Villalón, Karl Hammar & Cogan Shimizu (Ed.), Workshop on Ontology Design and Patterns 2019: Proceedings of the 10th Workshop on Ontology Design and Patterns (WOP 2019), co-located with 18th International Semantic Web Conference (ISWC 2019), Auckland, New Zealand, October 27, 2019 (pp. 1).
Hitzler, P. Fernandez, M. Janowicz, K. Zaveri, A. Gray, A. Lopez, V. , ... Hammar K. (2019). Preface. In: Lecture Notes in Computer Science: Volume 11503, 16th International Semantic Web Conference, ESWC 2019, Portorož, Slovenia, 2 June 2019 through 6 June 2019 (pp. v -vii).
Blomqvist, E., Hammar, K., Presutti, V. (2016). Engineering Ontologies with Patterns - The eXtreme Design Methodology. In: Pascal Hitzler, Aldo Gangemi, Krzysztof Janowicz, Adila Krisnadhi, Valentina Presutti (Ed.), Ontology Engineering with Ontology Design Patterns (pp. 23 -50).
Hammar, K. (2016). Quality of Content Ontology Design Patterns. In: Pascal Hitzler, Aldo Gangemi, Krzysztof Janowicz, Adila Krisnadhi, Valentina Presutti (Ed.), Ontology Engineering with Ontology Design Patterns (pp. 51 -71).
Hammar, K. Blomqvist, E. Carral, D. Van Erp, M. Fokkens, A. Gangemi, A. , ... Svatek V. (2016). Collected Research Questions Concerning Ontology Design Patterns. In: Pascal Hitzler, Aldo Gangemi, Krzysztof Janowicz, Adila Krisnadhi, Valentina Presutti (Ed.), Ontology Engineering with Ontology Design Patterns (pp. 189 -198).

Collections

Conference paper

Shimizu, C., Hammar, K., Hitzler, P. (2020). Modular graphical ontology engineering evaluated. Cham: Springer, 17th International Conference, ESWC 2020, Heraklion, Crete, Greece, May 31–June 4, 2020.
Hammar, K. (2020). Linked Data Creation with ExcelRDF. Cham: Springer, ESWC 2020 Satellite Events, Heraklion, Crete, Greece, May 31 – June 4, 2020, Revised Selected Papers.
Hammar, K., Kutz, O., Dimou, A., Hahmann, T., Hoehndorf, R., Masolo, C., Vita, R. (2020). Preface. Joint Ontology Workshops co-located with the Bolzano Summer of Knowledge (BOSK 2020), Virtual & Bozen-Bolzano, Italy, August 31st to October 7th, 2020.
Shimizu, C., Hammar, K. (2019). CoModIDE – The Comprehensive Modular Ontology Engineering IDE. ISWC 2019 Satellite Tracks (Posters & Demonstrations, Industry, and Outrageous Ideas) co-located with 18th International Semantic Web Conference (ISWC 2019) Auckland, New Zealand, October 26-30, 2019..
Hammar, K., Wallin, E., Karlberg, P., Hälleberg, D. (2019). The RealEstateCore Ontology. Cham: Springer, 18th International Semantic Web Conference, Auckland, New Zealand, October 26–30, 2019.
Alirezaie, M., Hammar, K., Blomqvist, E., Nyström, M., Ivanova, V. (2018). SmartEnv Ontology in E-care@home. 9th International Semantic Sensor Networks Workshop, Monterey, CA, United States, October 9, 2018.
Hammar, K., Hitzler, P., Krisnadhi, A., Ławrynowicz, A., Nuzzolese, A., Solanki, M. (2017). Preface. 7th Workshop on Ontology and Semantic Web Patterns.
Karima, N., Hammar, K., Hitzler, P. (2017). How to Document Ontology Design Patterns. 7th Workshop on Ontology and Semantic Web Patterns.
Hammar, K., Presutti, V. (2017). Template-Based Content ODP Instantiation. The 7th Workshop on Ontology and Semantic Web Patterns.
Hammar, K. (2015). Ontology Design Patterns in WebProtégé. ISWC 2015 Posters & Demonstrations Track co-located with the 14th International Semantic Web Conference (ISWC-2015), Betlehem, USA, October 11, 2015.
Hammar, K. (2014). Ontology Design Pattern Property Specialisation Strategies. Berlin: Springer Berlin/Heidelberg, International Conference on Knowledge Engineering and Knowledge Management (EKAW) 2014.
Hammar, K. (2014). Ontology Design Patterns: Improving Findability and Composition. Berlin: Springer Berlin/Heidelberg, Extended Semantic Web Conference (ESWC) 2014.
Hammar, K. (2014). Ontology Design Patterns: Adoption Challenges and Solutions. Second International Workshop on Semantic Web Enterprise Adoption and Best Practice in conjunction with the 11th European Semantic Web Conference (ESWC 2014), Anissaras, Greece, May 26, 2014.
Hammar, K. (2014). Reasoning Performance Indicators for Ontology Design Patterns. Workshop on Ontology and Semantic Web Patterns in conjunction with the 12th International Semantic Web Conference (ISWC) 2013.
Hammar, K. (2012). Ontology Design Patterns in Use: Lessons Learnt from an Ontology Engineering Case. Workshop on Ontology Patterns in conjunction with the 11th International Semantic Web Conference 2012 (ISWC 2012).
Hammar, K. (2012). Modular Semantic CEP for Threat Detection. Mexico City: National Polytechnic Institute, Operations Research and Data Mining (ORADM) 2012.
Hammar, K. (2011). DC Proposal: Towards an ODP Quality Model. Berlin: Springer, 10th International Semantic Web Conference, Bonn, Germany.
Hammar, K. (2011). The State of Ontology Pattern Research. Riga, Latvia: Riga Technical University, 4th Workshop on Information Logistics and Knowledge Supply for Viable Enterprises (ILOG 2011) in conjunction with 10th International Conference on Perspectives in Business Informatics Research (BIR 2011).
Hammar, K., Sandkuhl, K. (2010). The State of Ontology Pattern Research: A Systematic Review of ISWC, ESWC and ASWC 2005–2009. The Workshop On Ontology Patterns (WOP 2010) At The 9th International Semantic Web Conference (ISWC 2010).
Hammar, K., Tarasov, V., Lin, F. (2010). Information Reuse and Interoperability with Ontology Patterns and Linked Data: First Experiences from the ExpertFinder Project. Berlin: Springer, 3rd Workshop on Information Logistics and Knowledge Supply in conjunction with 13th International Conference on Business Information Systems.

Conference proceedings (editor)

Hammar, K., Kutz, O., Dimou, A., Hahmann, T., Hoehndorf, R., Masolo, C., Vita, R. (Eds.). (2020). JOWO 2020: The Joint Ontology Workshops: Proceedings of the Joint Ontology Workshops co-located with the Bolzano Summer of Knowledge (BOSK 2020).
Hitzler, P. Fernández, M. Janowicz, K. Zaveri, A. Gray, A. Lopez, V. , ... Hammar K. (Eds.). (2019). The Semantic Web: 16th International Conference, ESWC 2019, Portorož, Slovenia, June 2–6, 2019, Proceedings. , Cham: Springer
Skjæveland, M., Hu, Y., Hammar, K., Svátek, V., Ławrynowicz, A. (Eds.). (2018). WOP 2018: Workshop on Ontology Design and Patterns.
Hammar, K., Hitzler, P., Krisnadhi, A., Ławrynowicz, A., Nuzzolese, A., Solanki, M. (Eds.). (2017). Advances in Ontology Design and Patterns.
Gangemi, A., Gruninger, M., Hammar, K., Lefort, L., Presutti, V., Scherp, A. (Eds.). (2014). Proceedings of the 4th Workshop on Ontology and Semantic Web Patterns.
Hammar, K. García-Crespo, A. Gómez Berbís, J. Radzimski, M. Sánchez Cervantes, J. Coppens, S. , ... Vander Sande M. (Eds.). (2014). WaSABi-FEOSW 2014: Joint Proceedings of WaSABi 2014 and FEOSW 2014.
Blomqvist, E., Gangemi, A., Hammar, K., Suárez-Figueroa, M. (Eds.). (2012). WOP 2012: Proceedings of the 3rd Workshop on Ontology Patterns.

Dataset

Doctoral thesis

Hammar, K. (2017). Content Ontology Design Patterns: Qualities, Methods, and Tools (Doctoral thesis, Linköping: Linköping University Electronic Press).

Licentiate thesis

Hammar, K. (2013). Towards an Ontology Design Pattern Quality Model (Licentiate thesis, Linköping: Linköping University Electronic Press).