48 research outputs found

    Herramienta de apoyo a la docencia de algoritmos de selección de instancias

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    En el currículo de ingeniería informática la minería de datos y el aprendizaje automático son cada vez más relevantes, tanto en los cursos de grado y máster, como también en los de doctorado. Prueba de ello es la aparición de diversas herramientas que facilitan el aprendizaje de algoritmos relacionados con la disciplina, mediante la ejecución paso a paso de los mismos y la visualización de los resultados. Sin embargo, para el caso concreto de los algoritmos de selección de instancias, estas herramientas son prácticamente inexistentes. En el presente recurso docente se presenta una herramienta implementada para cubrir esta carencia. «Instance Selection», que es como se llama la aplicación, está preparada para mostrar el funcionamiento tanto de los algoritmos clásicos como alguno de los más modernos, permitiendo la ejecución paso a paso y visualizando los resultados intermedios para facilitar la labor didáctica. Las principales ventajas de la aplicación descrita en este recurso docente son: que implementa varios algoritmos, lo que permite su comparación, es multiplataforma, permite la visualización incremental de los pasos de los algoritmos implementados, la interfaz está preparada para varios idiomas e incluye una completa ayuda.SUMMARY -- In computer engineering curricula Data Mining and Machine Learning are increasingly important in both undergraduate and masters, as well as the PhD courses. The emergence of several tools that facilitate learning algorithms related to the discipline proves that. Some of these tools allow the execution of algorithms step by step showing the results of each step, others let the student change the algorithm parameters and the student can visualize the results. However, for the specific case of instance selection algorithms these tools are virtually nonexistent. This paper discusses a tool implemented to fill this gap. “Instance Selection”, which is the name of the application, is prepared to show the operation of both classical instance selection algorithms as some of the most modern, allowing the execution step by step and displaying the intermediate results to facilitate the teaching task. The main advantages of the application described in this teaching resource are that it implements several algorithms, allowing comparison between them, it is multi-platform, it allows the interactive visualization of the steps of the implemented algorithms, the interface is ready for several languages, it includes comprehensive help.Peer Reviewe

    Visor de escenarios de cambio climático de adapteCCa: consulta interactiva y acceso a escenarios-PNACC 2017

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    Ponencia presentada en: XI Congreso de la Asociación Española de Climatología celebrado en Cartagena entre el 17 y el 19 de octubre de 2018.[ES]Las proyecciones regionales de cambio climático son una información básica para realizar estudios de impacto y adaptación en distintos sectores socio-económicos. La recopilación y producción de estas proyecciones a nivel nacional es una tarea básica del Plan Nacional de Adaptación al Cambio Climático (PNACC), a través de Escenarios-PNACC. La primera versión (2012) se basó en la información del IPCCAR4 y en dos acciones estratégicas nacionales (ESCENA y ESTCENA). Recientemente, se ha llevado a cabo una actualización de estos escenarios regionales a partir de IPCC-AR5 y de los proyectos CORDEX y VALUE (con la participación de AEMET y CSIC-UC), que proporciona series diarias en rejilla y puntuales de distintas variables e índices para múltiples escenarios y modelos. En este trabajo se presenta la actualización Escenarios-PNACC 2017, así como el visor de escenarios de cambio climático desarrollado en el marco de la plataforma AdapteCCa para facilitar a los usuarios el análisis interactivo y el acceso a esta información (http://escenarios.adaptecca.es).[EN]Regional projections of climate change are key information to carry out impact and adaptation studies in different socio-economic sectors. The compilation and production of these projections at the national level is a basic task of the National Plan of Adaptation to Climate Change (PNACC), through Escenarios-PNACC. The first version (2012) was based on IPCC-AR3 information and two national strategic actions (ESCENA and ESTCENA). Recently, an update of these regional scenarios has been carried out from IPCC-AR5 and from the CORDEX and VALUE projects (with the participation of AEMET and CSIC-UC), providing daily gridded and point series of different variables and indices for multiple scenarios and models. This paper describes the update Escenarios-PNACC 2017, as well as the "viewer of climate change scenarios" developed within the framework of the AdapteCCa platform to provide users with interactive analysis and access to this information (http://escenarios.adaptecca.es)

    Instance selection of linear complexity for big data

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    Over recent decades, database sizes have grown considerably. Larger sizes present new challenges, because machine learning algorithms are not prepared to process such large volumes of information. Instance selection methods can alleviate this problem when the size of the data set is medium to large. However, even these methods face similar problems with very large-to-massive data sets. In this paper, two new algorithms with linear complexity for instance selection purposes are presented. Both algorithms use locality-sensitive hashing to find similarities between instances. While the complexity of conventional methods (usually quadratic, O(n2), or log-linear, O(nlogn)) means that they are unable to process large-sized data sets, the new proposal shows competitive results in terms of accuracy. Even more remarkably, it shortens execution time, as the proposal manages to reduce complexity and make it linear with respect to the data set size. The new proposal has been compared with some of the best known instance selection methods for testing and has also been evaluated on large data sets (up to a million instances).Supported by the Research Projects TIN 2011-24046 and TIN 2015-67534-P from the Spanish Ministry of Economy and Competitiveness

    Tratamientos psicológicos empíricamente apoyados para adultos: Una revisión selectiva

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    Antecedentes: los tratamientos psicológicos han mostrado su eficacia, efectividad y eficiencia para el abordaje de los trastornos mentales; no obstante, considerando el conocimiento científico generado en los últimos años, no se dispone de trabajos de actualización en español sobre cuáles son los tratamientos psicológicos con respaldo empírico. El objetivo fue realizar una revisión selectiva de los principales tratamientos psicológicos empíricamente apoyados para el abordaje de trastornos mentales en personas adultas. Método: se recogen niveles de evidencia y grados de recomendación en función de los criterios propuestos por el Sistema Nacional de Salud de España (en las Guías de Práctica Clínica) para diferentes trastornos psicológicos. Resultados: los resultados sugieren que los tratamientos psicológicos disponen de apoyo empírico para el abordaje de un amplio elenco de trastornos psicológicos. El grado de apoyo empírico oscila de bajo a alto en función del trastorno psicológico analizado. La revisión sugiere que ciertos campos de intervención necesitan una mayor investigación. Conclusiones: a partir de esta revisión selectiva, los profesionales de la psicología podrán disponer de información rigurosa y actualizada que les permita tomar decisiones informadas a la hora de implementar aquellos procedimientos psicoterapéuticos empíricamente fundamentados en función de las características de las personas que demandan ayuda. Background: Psychological treatments have shown their efficacy, effectiveness, and efficiency in dealing with mental disorders. However, considering the scientific knowledge generated in recent years, in the Spanish context, there are no updating studies about empirically supported psychological treatments. The main goal was to carry out a selective review of the main empirically supported psychological treatments for mental disorders in adults. Method: Levels of evidence and degrees of recommendation were collected based on the criteria proposed by the Spanish National Health System (Clinical Practice Guidelines) for different psychological disorders. Results: The results indicate that psychological treatments have empirical support for the approach to a wide range of psychological disorders. These levels of empirical evidence gathered range from low to high depending on the psychological disorder analysed. The review indicates the existence of certain fields of intervention that need further investigation. Conclusions: Based on this selective review, psychology professionals will be able to have rigorous, up-to-date information that allows them to make informed decisions when implementing empirically based psychotherapeutic procedures based on the characteristics of the people who require help

    Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

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    A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

    Measurement of jet fragmentation in Pb+Pb and pppp collisions at sNN=2.76\sqrt{{s_\mathrm{NN}}} = 2.76 TeV with the ATLAS detector at the LHC

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    Measurement of the W boson polarisation in ttˉt\bar{t} events from pp collisions at s\sqrt{s} = 8 TeV in the lepton + jets channel with ATLAS

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    Measurements of top-quark pair differential cross-sections in the eμe\mu channel in pppp collisions at s=13\sqrt{s} = 13 TeV using the ATLAS detector

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    Search for new phenomena in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in s=\sqrt{s}= 13 pppp collisions with the ATLAS detector

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