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Semantic Classification and Indexing of Open Educational Resources with Word Embeddings and Ontologies

Authors
  • Koutsomitropoulos, Dimitrios A.1
  • Andriopoulos, Andreas D.1
  • Likothanassis, Spiridon D.1
  • 1 University of Patras, Greece , (Greece)
Type
Published Article
Journal
Cybernetics and Information Technologies
Publisher
Sciendo
Publication Date
Sep 13, 2020
Volume
20
Issue
5
Pages
95–116
Identifiers
DOI: 10.2478/cait-2020-0043
Source
De Gruyter
Keywords
License
Green

Abstract

The problem of thematic indexing of Open Educational Resources (OERs) is often a time-consuming and costly manual task, relying on expert knowledge. In addition, a lot of online resources may be poorly annotated with arbitrary, ad-hoc keywords instead of standard, controlled vocabularies, a fact that stretches up the search space and hampers interoperability. In this paper, we propose an approach that facilitates curators and instructors to annotate thematically educational content. To achieve this, we combine explicit knowledge graph representations with vector-based learning of formal thesaurus terms. We apply this technique in the domain of biomedical literature and show that it is possible to produce a reasonable set of thematic suggestions which exceed a certain similarity threshold. Our method yields acceptable levels for precision and recall against corpora already indexed by human experts. Ordering of recommendations is significant and this approach can also have satisfactory results for the ranking problem. However, traditional IR metrics may not be adequate due to semantic relations amongst recommended terms being underutilized.

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