3,417 research outputs found
CARS – A Spatio-Temporal BDI Recommender System: Time, Space and Uncertainty
International audienceAgent-based recommender systems have been exploited in the last years to provide informative suggestions to users, showing the advantage of exploiting components like beliefs, goals and trust in the recommenda-tions' computation. However, many real-world scenarios, like the traffic one, require the additional feature of representing and reasoning about spatial and temporal knowledge, considering also their vague connotation. This paper tackles this challenge and introduces CARS, a spatio-temporal agent-based recommender system based on the Belief-Desire-Intention (BDI) architecture. Our approach extends the BDI model with spatial and temporal information to represent and reason about fuzzy beliefs and desires dynamics. An experimental evaluation about spatio-temporal reasoning in the traffic domain is carried out using the NetLogo platform, showing the improvements our recommender system introduces to support agents in achieving their goals
Discovering the Impact of Knowledge in Recommender Systems: A Comparative Study
Recommender systems engage user profiles and appropriate filtering techniques
to assist users in finding more relevant information over the large volume of
information. User profiles play an important role in the success of
recommendation process since they model and represent the actual user needs.
However, a comprehensive literature review of recommender systems has
demonstrated no concrete study on the role and impact of knowledge in user
profiling and filtering approache. In this paper, we review the most prominent
recommender systems in the literature and examine the impression of knowledge
extracted from different sources. We then come up with this finding that
semantic information from the user context has substantial impact on the
performance of knowledge based recommender systems. Finally, some new clues for
improvement the knowledge-based profiles have been proposed.Comment: 14 pages, 3 tables; International Journal of Computer Science &
Engineering Survey (IJCSES) Vol.2, No.3, August 201
Two-phased knowledge formalisation for hydrometallurgical gold ore process recommendation and validation
This paper describes an approach to externalising and formalising expert knowledge involved in the design and evaluation of hydrometallurgical process chains for gold ore treatment. The objective was to create a case-based reasoning application for recommending and validating a treatment process of gold ores. We describe a twofold approach. Formalising human expert knowledge about gold mining situations enables the retrieval of similar mining contexts and respective process chains, based on prospection data gathered from a potential gold mining site. Secondly, empirical knowledge on hydrometallurgical treatments is formalised. This enabled us to evaluate and, where needed, redesign the process chain that was recommended by the first aspect of our approach. The main problems with formalisation of knowledge in the domain of gold ore refinement are the diversity and the amount of parameters used in literature and by experts to describe a mining context. We demonstrate how similarity knowledge was used to formalise literature knowledge. The evaluation of data gathered from experiments with an initial prototype workflow recommender, Auric Adviser, provides promising results
Analyzing recommender systems for health promotion using a multidisciplinary taxonomy: A scoping review
Background: Recommender systems are information retrieval systems that provide users with relevant items
(e.g., through messages). Despite their extensive use in the e-commerce and leisure domains, their application in
healthcare is still in its infancy. These systems may be used to create tailored health interventions, thus reducing
the cost of healthcare and fostering a healthier lifestyle in the population.
Objective: This paper identifies, categorizes, and analyzes the existing knowledge in terms of the literature
published over the past 10 years on the use of health recommender systems for patient interventions. The aim of
this study is to understand the scientific evidence generated about health recommender systems, to identify any
gaps in this field to achieve the United Nations Sustainable Development Goal 3 (SDG3) (namely, “Ensure healthy
lives and promote well-being for all at all ages”), and to suggest possible reasons for these gaps as well as to
propose some solutions.
Methods: We conducted a scoping review, which consisted of a keyword search of the literature related to health
recommender systems for patients in the following databases: ScienceDirect, PsycInfo, Association for Computing
Machinery, IEEExplore, and Pubmed. Further, we limited our search to consider only English-lan-guage journal
articles published in the last 10 years. The reviewing process comprised three researchers who filtered the results
simultaneously. The quantitative synthesis was conducted in parallel by two researchers, who classified each
paper in terms of four aspects—the domain, the methodological and procedural aspects, the health promotion
theoretical factors and behavior change theories, and the technical aspects—using a new multidisciplinary
taxonomy.
Results: Nineteen papers met the inclusion criteria and were included in the data analysis, for which thirty-three
features were assessed. The nine features associated with the health promotion theoretical factors and behavior
change theories were not observed in any of the selected studies, did not use principles of tailoring, and did not
assess (cost)-effectiveness.
Discussion: Health recommender systems may be further improved by using relevant behavior change strategies
and by implementing essential characteristics of tailored interventions. In addition, many of the features required
to assess each of the domain aspects, the methodological and procedural aspects, and technical aspects
were not reported in the studies.
Conclusions: The studies analyzed presented few evidence in support of the positive effects of using health recommender
systems in terms of cost-effectiveness and patient health outcomes. This is why future studies should
ensure that all the proposed features are covered in our multidisciplinary taxonomy, including integration with
electronic health records and the incorporation of health promotion theoretical factors and behavior change
theories. This will render those studies more useful for policymakers since they will cover all aspects needed to
determine their impact toward meeting SDG3.European Union's Horizon 2020 No 68112
A general framework for intelligent recommender systems
AbstractIn this paper, we propose a general framework for an intelligent recommender system that extends the concept of a knowledge-based recommender system. The intelligent recommender system exploits knowledge, learns, discovers new information, infers preferences and criticisms, among other things. For that, the framework of an intelligent recommender system is defined by the following components: knowledge representation paradigm, learning methods, and reasoning mechanisms. Additionally, it has five knowledge models about the different aspects that we can consider during a recommendation: users, items, domain, context and criticisms. The mix of the components exploits the knowledge, updates it and infers, among other things. In this work, we implement one intelligent recommender system based on this framework, using Fuzzy Cognitive Maps (FCMs). Next, we test the performance of the intelligent recommender system with specialized criteria linked to the utilization of the knowledge in order to test the versatility and performance of the framework
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