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References One of the main challenges information systems now confront is the effective management of large volumes of documents they store to easily and swiftly facilitate information consumers´ access to resources that satisfy their needs. "Servicio semántico de difusión selectiva de información (DSI) para bibliotecas digitales." El profesional de la información[in press], Popescul, A. of the 17th Conference on Unceertainty in Artificial Intelligence (UAI), pp.

These systems apply information filtering techniques that enable user access to information they need.

An ontology compartmentalizes the variables needed for some set of computations and establishes the relationships between them.

The origin of these types of systems goes back to the early nineties, when news filtering services arose within newsgroups allowing its community of users to access only that which may possibly interest them (Foltz; Dumais, 1992) (Resnick et al., 1994) (Stodolsky, 1990). "A framework for collaborative, content-based and demographic filtering." Artif. Ontological and conceptual diagram based systems 3.1.1. Traditionally in the context of libraries, the challenges of information overloads was tackled through different measures, like the creation of selective diffusion of information services (SDI), in which, depending on the profile agreement of the users subscribed to the service, a series of alerts notifying the existence of resources that suit the user's interests is generated periodically (or upon user request) (Aksoy et al., 1998), (Foltz; Dumais, 1992). Semantic recommender systems: a bibliographic review 3.1. This need becomes even more pressing in today's society where the user's demand continues to grow. In fact, recommender systems could be considered SDI systems applied to the Web, but obviously with infinitely greater and more sophisticated filtering capacities. The Web, despite having unique characteristics that clearly distinguish it from libraries, suffer from essentially the same problem, and to handle them it has focused on applying similar solutions, such as information filtering systems (also known as recommender systems).

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