111 research outputs found
Vers des recommandations plus personnalisées dans les folksonomies
Session 3 : Web socialNational audiencePlusieurs approches ont Ă©tĂ© proposĂ©es dans la littĂ©rature pour personnaliser les recommandations dans les folksonomies. Dans ce papier, nous considĂ©rons une nouvelle dimension dans les folksonomies comme information supplĂ©mentaire pour offrir aux utilisateurs une recommandation plus ciblĂ©e et mieux conforme Ă leurs besoins. Cela passe par un regroupement des utilisateurs ayant des intĂ©rĂȘts communs sous forme de structures appelĂ©es quadri-concepts. Notre approche, dans laquelle nous rĂ©pondons Ă©galement au challenge de cold start, est ensuite Ă©valuĂ©e sur deux jeux de donnĂ©es du monde rĂ©el, MOVIELENS et BOOKCROSSING. Cette Ă©valuation comprend une mesure de la prĂ©cision et du rappel, une Ă©valuation sociale ainsi que plusieurs mĂ©triques d'Ă©valuation comme la diversitĂ©, la couverture ou la scalabilitĂ©
mldr.resampling: Efficient Reference Implementations of Multilabel Resampling Algorithms
Resampling algorithms are a useful approach to deal with imbalanced learning
in multilabel scenarios. These methods have to deal with singularities in the
multilabel data, such as the occurrence of frequent and infrequent labels in
the same instance. Implementations of these methods are sometimes limited to
the pseudocode provided by their authors in a paper. This Original Software
Publication presents mldr.resampling, a software package that provides
reference implementations for eleven multilabel resampling methods, with an
emphasis on efficiency since these algorithms are usually time-consuming
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Data processing for anomaly detection in web-based applications
Web applications are popular attack targets. Misuse detection systems use signature databases to detect known attacks. However, it is difficult to keep the database up to date with the rate of discovery of vulnerabilities. They also cannot detect zero-day attacks. By contrast, anomaly detection systems learn the normal behavior of the system and monitor its activity to detect any deviations from the normal. Any such deviations are flagged as anomalous. This thesis presents an anomaly
detection system for web-based applications. The anomaly detection system monitors the attribute value pairs of successful HTTP requests received by webserver applications and automatically creates parameter profiles. It then uses these profiles to detect anomalies in the HTTP requests. Customized profiles help reduce the number of false positives. Automatic learning ensures that the system can be used with different kinds of web application environments, without the necessity for manual configuration. The results of the detection are also visualized, which enable the system administrator to quickly understand the state of the system and respond accordingly.Keywords: anomaly, anomaly detection, web application, security, computer science, computer security, compute
Energy Disaggregation Using Elastic Matching Algorithms
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)In this article an energy disaggregation architecture using elastic matching algorithms is presented. The architecture uses a database of reference energy consumption signatures and compares them with incoming energy consumption frames using template matching. In contrast to machine learning-based approaches which require significant amount of data to train a model, elastic matching-based approaches do not have a model training process but perform recognition using template matching. Five different elastic matching algorithms were evaluated across different datasets and the experimental results showed that the minimum variance matching algorithm outperforms all other evaluated matching algorithms. The best performing minimum variance matching algorithm improved the energy disaggregation accuracy by 2.7% when compared to the baseline dynamic time warping algorithm.Peer reviewedFinal Published versio
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