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Cristian Cechinel Miguel-Ángel Sicilia Salvador Sánchez-Alonso Elena García-Barriocanal 《Information processing & management》2013
Collaborative filtering (CF) algorithms are techniques used by recommender systems to predict the utility of items for users based on the similarity among their preferences and the preferences of other users. The enormous growth of learning objects on the internet and the availability of preferences of usage by the community of users in the existing learning object repositories (LORs) have opened the possibility of testing the efficiency of CF algorithms on recommending learning materials to the users of these communities. In this paper we evaluated recommendations of learning resources generated by different well known memory-based CF algorithms using two databases (with implicit and explicit ratings) gathered from the popular MERLOT repository. We have also contrasted the results of the generated recommendations with several existing endorsement mechanisms of the repository to explore possible relations among them. Finally, the recommendations generated by the different algorithms were compared in order to evaluate whether or not they were overlapping. The results found here can be used as a starting point for future studies that account for the specific context of learning object repositories and the different aspects of preference in learning resource selection. 相似文献
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Ingrid Martorell Marc Medrano Cristian Solé Neus Vila Luisa F. Cabeza 《Educational gerontology》2013,39(8):712-731
With the increasing number of older people in the world and their interest in education, universities play an important role in providing effective learning methodologies. This paper presents a new instructional methodology implementing inquiry-based learning (IBL) in two courses focused on alternative energies in the Program for Older People at the University of Lleida (UdL) in Spain. The instructional methodology is evaluated and results are discussed after two years of studies. The instructional methodology presented in this paper helped students to build and reinforce scientific skills and knowledge construction. This work may have potential relevance to other instructors involved in adult education. 相似文献
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This paper treats document–document similarity approaches in the context of science mapping. Five approaches, involving nine methods, are compared experimentally. We compare text-based approaches, the citation-based bibliographic coupling approach, and approaches that combine text-based approaches and bibliographic coupling. Forty-three articles, published in the journal Information Retrieval, are used as test documents. We investigate how well the approaches agree with a ground truth subject classification of the test documents, when the complete linkage method is used, and under two types of similarities, first-order and second-order. The results show that it is possible to achieve a very good approximation of the classification by means of automatic grouping of articles. One text-only method and one combination method, under second-order similarities in both cases, give rise to cluster solutions that to a large extent agree with the classification. 相似文献
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Caio Moura Daoud Edleno Silva de Moura David Fernandes Altigran Soares da Silva Cristian Rossi Andre Carvalho 《Information Retrieval》2017,20(3):292-316
In this paper, we present Waves, a novel document-at-a-time algorithm for fast computing of top-k query results in search systems. The Waves algorithm uses multi-tier indexes for processing queries. It performs successive tentative evaluations of results which we call waves. Each wave traverses the index, starting from a specific tier level i. Each wave i may insert only those documents that occur in that tier level into the answer. After processing a wave, the algorithm checks whether the answer achieved might be changed by successive waves or not. A new wave is started only if it has a chance of changing the top-k scores. We show through experiments that such lazy query processing strategy results in smaller query processing times when compared to previous approaches proposed in the literature. We present experiments to compare Waves’ performance to the state-of-the-art document-at-a-time query processing methods that preserve top-k results and show scenarios where the method can be a good alternative algorithm for computing top-k results. 相似文献
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Re-bordering comparative education in Latin America: Between global limits and local characteristics 总被引：1，自引：0，他引：1
Felicitas Acosta Cristian G. Perez Centeno 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2011,38(4):477-496
Conceived for presentation at the XIV WCCES conference in Istanbul in 2010, the topic of which was “Bordering Comparative
Education”, this paper, within that framework, aims to present the current state of the discipline in Latin America in relation
to a quick overview of its present-day situation at a global level. After providing an overview of the current debates on
comparative education, with special emphasis on what the authors refer to as motor nuclei (a series of milestones or episodes which have become transdiscursive as the discipline has evolved), as well as pinpointing
current challenges in the field, this paper looks into the development of the discipline in Latin America and how it has contributed
to the understanding of the region’s educational systems. The paper also examines the unique relationship between comparative
studies and the field of educational planning in Latin America. The authors then go on to provide a thematic analysis, categorising
the papers presented at three conferences held by the Sociedad Argentina de Estudios Comparados en Educación (SAECE, the Argentine Society for Comparative Education Studies) in 2005, 2007 and 2009. The paper closes with several conclusions
regarding the current debate on the discipline in the region and its possibilities for the future. 相似文献
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The paper takes into discussion the issue of quality of higher education services, from the perspective of graduates and employers as main beneficiaries of higher education services, by putting face to face expectations of students at graduation with employers’ requirements. In the two surveys conducted in 2006 in Romania, both graduates and employers have been asked about skills and abilities developed through higher education programmes and the extent to which these correspond to their expectations and requirements. The discussion is relevant to the vast literature presenting the skills debate, employment and graduates transition to the labour market, as well as to the literature presenting students’ expectations from higher education. 相似文献