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Anisotropic propagation of user interests in ontology-based user models

Cena, Federica; Likavec, Silvia and Osborne, Francesco (2013). Anisotropic propagation of user interests in ontology-based user models. Information Sciences, 250 pp. 40–60.

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This work contributes to the development of ontology-based user models, devised as overlays over conceptual hierarchies derived from domain ontologies. We tackle the problem of propagation of user interests in such a conceptual hierarchy. In addition to accounting for the hierarchical structure of the domain and the type and amount of feedback provided by the user, the principal contributions introduced in this work are: (i) horizontal propagation which enables propagation among siblings, in addition to vertical propagation among ancestors and descendants; (ii) anisotropic vertical propagation which permits user interests to be propagated differently upward and downward; (iii) context-dependance which introduces the possibility to propagate differently according to various contexts for specific applications; (iv) support for dynamic ontology maintenance, i.e. preserving the user interest values when adding or removing a node from the conceptual hierarchy. Our approach supports finer recommendation modalities and contributes to the resolution of the cold start problem, since it allows for propagation from a small number of initial concepts to other related domain concepts by exploiting the conceptual hierarchy of the domain. A field evaluation confirmed the effectiveness of our approach w.r.t. the traditional vertical propagation.

Item Type: Journal Item
Copyright Holders: 2013 Elsevier Inc.
ISSN: 0020-0255
Keywords: user model; ontology; conceptual hierarchy; propagation of interests; Semantic Web; Recommender Systems
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Knowledge Media Institute (KMi)
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 39990
Depositing User: Francesco Osborne
Date Deposited: 28 Apr 2014 08:28
Last Modified: 09 Dec 2018 05:39
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