A reference ontology for profiling scholar’s background knowledge in recommender systems

• We develop a reference ontology which is adapted to the structure of scholars’ knowledge.
• The reference ontology is developed by merging six Web taxonomies.
• We employ DBpedia to transform and map scholar’s knowledge to the reference ontology.
• We improve coverage, specificity, and richness of the domain’s reference ontology.

The profiling of background knowledge is essential in scholar’s recommender systems. Existing ontology-based profiling approaches employ a pre-built reference ontology as a backbone structure for representing the scholar’s preferences. However, such singular reference ontologies lack sufficient ontological concepts and are unable to represent the hierarchical structure of scholars’ knowledge. They rather encompass general-purpose topics of the domain and are inaccurate in representing the scholars’ knowledge. This paper proposes a method for integrating of multiple domain taxonomies to build a reference ontology, and exploits this reference ontology for profiling scholars’ background knowledge. In our approach, various topics of Computer Science domain from Web taxonomies are selected, transformed by DBpedia, and merged to construct a reference ontology. We demonstrate the effectiveness of our approach by measuring five quality-based metrics as well as application-based evaluation against the developed reference ontology. The empirical results show an improvement over the existing reference ontologies in terms of completeness, richness, and coverage.