We currently work on ontology enineering and sports analytics.
1. Ontology Engineering
Ontology Engineering - Ontology Alignment
Many ontologies contain overlapping information. Ontology alignment deals
with finding mappings beween terms in different ontologies.
Ontology alignment framework and system. Development of frameworks for
aligning and merging ontologies based on the computation of similarity
values between terms in the source ontologies (basic and session-based).
Development of an ontology alignment and merging system (SAMBO). (Winner of the Anatomy track of the 2008 Ontology Alignment Evaluation Initiative.) Development of ontology alignment
strategies (preprocessing, matching, filtering).
Evaluation of ontology alignment strategies. Development of framework for
evaluation and comparison of ontology alignment strategies. Development of
an environment for evaluation and comparison of alignment strategies
(KitAMO). (First environment of its kind.) Evaluation of alignment
strategies and systems. (First larger evaluation of algorithms.)
Recommendation of ontology alignment strategies. Development of framework
for recommending ontology alignment strategies. Implementation and
evaluation of different recommendation strategies. (One of the first
approaches for recommendation of strategies.)
Using partial alignments (PA) in ontology alignment.
Development and evaluation of several strategies for using given correct
mappings in ontology alignment: for preprocessing, within matchers, for
filtering. (First approach for using PA in ontology alignment.)
User Support for Ontology Alignment. Development of requirements. Evaluation of state-of-the-art systems.
Development of a tool for visual exploration of multiple alignments (Alignment Cubes).
SAMBO, KitAMO, Alignment Cubes and
my annotated bibliography.
Since 2013 our group organizes the Anatomy track of the Ontology Alignment Evaluation Initiative.
Since 2015 our group co-organizes the Interactive track of the Ontology Alignment Evaluation Initiative.
Our group co-organized the International Workshop on Visualizations and User Interfaces for Knowledge Engineering and Linked Data Analytics in 2014. As a follow up we founded the VOILA series (Workshop on Visualizations and User Interfaces for Ontologies and Linked Data / International Workshop on Visualization and Interaction for Ontologies and Linked Data) in 2015 which is yearly running as an ISWC workshop.
Ontology Engineering - Ontology completion and debugging
Developing ontologies is not an easy task and often the resulting
ontologies are not consistent (logically) or complete (with respect to the domain).
Such ontologies, although often useful, lead to problems when used in
semantically-enabled applications. Wrong conclusions may be
derived or valid conclusions may be missed. To deal with this
problem we may want to complete and debug the ontologies.
See why this is an important problem in our video that won best teaser video at ISWC 2021.
Method and system for detecting and repairing missing and wrong is-a structure of single ontologies as well as in a network of ontologies.
(First to study debugging missing is-a structure (or completing the is-a structure) with advanced repairing method.)
Formalization of the problem of repairing missing is-a structure as a new abductive reasoning problem.
Unified approach to debug is-a structure in and mappings between taxonomies.
First to combine removing, completing and weakening to mitigate negative effects of removing wrong axioms from ontologies.
System: development of system RepOSE (Repairing of Ontological Structure Environment) for repairing ontologies; different versions for taxonomies, EL ontologies and ALC ontologies; versions with and without alignment; versions with and without weakening.
Method for ontology extension based on a phrase-based topic model approach.
System: development of system Phrase2Onto for extending ontologies.
RepOSE (with weakening)
my annotated bibliography.
We co-founded the International Workshop on Debugging Ontologies and Ontology Mappings series (2012-2014). The scope was extended in 2016 and we co-organized the International Workshop on Completing and Debugging the Semantic Web.
Ontology Engineering - Ontology evolution
Ontologies are not static entities but evolve over time. This influences semantically-enabled applications, e.g., through the fact that concepts that are used in annotations can change their meaning and relationships towards other concepts.
User Support for Ontology Evolution. Development of requirements. Literature study of state-of-the-art systems.
my annotated bibliography.
Ontology Engineering - Developed ontologies
Ontology Engineering - Applications
- DCMD/MD2 (Data-driven computational materials design / Modeling and Development for Materials Design) - Swedish e-Science Reasearch Center
- MDO - Materials Design Ontology (see above)
- Extensions to NanoParticle Ontology and eNanoMapper:
- Onto-DESIDE (Ontology-based Decentralized Sharing of Industry Data in the European Circular Economy) EU project
- SPIRIT (Scalable privacy preserving intelligence analysis for resolving identities) EU project
- VALCRI (Visual analytics for sense-making in criminal intelligence analysis) EU project, winner of the 2022 Security Innovation Award - Commercialisation from the European Commission
Ontology-Based GraphQL Server Generation for Data Access and Integration
Method for data access and integration
Proof-of-concept application the materials science domain
System: development of the OBG-gen system
See also OBG-gen.
Storage and querying for archetype-based electronic health record data
Study of the performance of different types of databases for storage and querying for archetyp-based electronic health record data.
Comparison of different NoSQL approaches.
3. Sports Analytics
Our focus is on ice hockey where we study player impact in ice hockey, visualization of ice hockey data, and knowledge representation for ice hockey.
However, we have also worked on prediction of game and season outcomes, player impact and player trajectories in other sports such as soccer and basketball.
In 2022 we founded the first ice hockey analytics conference series in Europe (LINHAC 2022) and organized events every year since then.
See papers of the
Sports Analytics group.