38 resultados para DeepLearning NeuralNetwork StackedDenoisingAuto-encoder ArtificialIntelligence IntelligenzaArtificiale RetiNeurali TimeSeries SerieStoriche SerieTemporali Forecasting Previsione Auto-encoder

em Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco


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En este proyecto presentamos el diseño e implementación de un móvil de dos ruedas, en concreto un robot balancín. En él se estudiarán las teorías necesarias para que un móvil de dos ruedas se mantenga en equilibrio y poner dichas teorías en práctica.

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In this article an index decomposition methodology is used to estimate the effect of intersectorial and intrasectorial changes in explaining the 38% reduction in industrial energy intensity in the Basque Autonomous Community from 1982 to 2001. Period-wise additive decomposition results show that (1) the decline is fully explained by intrasectorial changes and that (2) intersectorial changes have not contributed to reduce but to increase the energy intensity of the Basque industrial sector. However, timeseries decomposition analysis shows that (1) four different phases can be distinguished in the evolution of energy intensity of the Basque industry from 1982 to 2001 and (2) that the evolution of the “Iron and Steel” sector is determinant when explaining those phases. Moreover, the analysis stresses the necessity to disaggregate the “Iron and Steel” sector in order to be able to distinguish purely technological effects from the rest of intrasectorial changes.

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[ES] Una de las principales preocupaciones en el área de la microestructura del mercado ha sido la estimación de los componentes no observables de la horquilla de precios a partir de las series de datos que proporcionan los mercados financieros, despertando quizá un mayor interés el de selección adversa por la implicaciones que supone la existencia del mismo. Esto ha provocado el desarrollo de numerosos modelos empíricos que, basándose en las propiedades estadísticas de las series de precios, proporcionan dichas estimaciones. La mayor disponibilidad de datos existentes en los mercados ha permitido el desarrollo en los últimos años de modelos basados en técnicas estadísticas más complejas como son el método generalizado de momentos o la metodología VAR y cuya base de partida es la dinámica de la formación del precio, y, en concreto, cómo la información privada de las transacciones se recoge en los nuevos precios cotizados. El objetivo de este trabajo es analizar este último grupo de trabajos, es decir, aquellos modelos de estimación de los componentes de la horquilla basados en la dinámica de la formación de precios que, además de permitir la estimación del componente de selección adversa en series temporales, suponen una herramienta fundamental para analizar el proceso de incorporación de la información a los precios cotizados en los distintos mercados.

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Published also as: Documento de Trabajo Banco de España 0504/2005.

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The main objective of this paper is to analyse the value of information contained in prices of options on the IBEX 35 index at the Spanish Stock Exchange Market. The forward looking information is extracted using implied risk-neutral density functions estimated by a mixture of two-lognormals and three alternative risk-adjustments: the classic power and exponential utility functions and a habit-based specification that allows for a counter-cyclical variation of risk aversion. Our results show that at four-week horizon we can reject the hypothesis that between October 1996 and March 2000 the risk-neutral densities provide accurate predictions of the distributions of future realisations of the IBEX 35 index at a four-week horizon. When forecasting through risk-adjusted densities the performance of this period is statistically improved and we no longer reject that hypothesis. All risk-adjusted densities generate similar forecasting statistics. Then, at least for a horizon of four-weeks, the actual risk adjustment does not seem to be the issue. By contrast, at the one-week horizon risk-adjusted densities do not improve the forecasting ability of the risk-neutral counterparts.

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Tracking the evolution of research in waste recycling science (WRS) can be valuable for environmental agencies, as well as for recycling businesses. Maps of science are visual, easily readable representations of the cognitive structure of a branch of science, a particular area of research or the global spectrum of scientific production. They are generally built upon evidence collected from reliable sources of information, such as patent and scientific publication databases. This study uses the methodology developed by Rafols et al. (2010) to make a “double overlay map” of WRS upon a basemap reflecting the cognitive structure of all journal-published science, for the years 2005 and 2010. The analysis has taken into account the cognitive areas where WRS articles are published and the areas from where it takes its intellectual nourishing, paying special attention to the growing trends of the key areas. Interpretation of results lead to the conclusion that extraction of energy from waste will probably be an important research topic in the future, along with developments in general chemistry and chemical engineering oriented to the recovery of valuable materials from waste. Agricultural and material sciences, together with the combined economics, politics and geography field, are areas with which WRS shows a relevant and ever increasing cognitive relationship.

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Providing on line travel time information to commuters has become an important issue for Advanced Traveler Information Systems and Route Guidance Systems in the past years, due to the increasing traffic volume and congestion in the road networks. Travel time is one of the most useful traffic variables because it is more intuitive than other traffic variables such as flow, occupancy or density, and is useful for travelers in decision making. The aim of this paper is to present a global view of the literature on the modeling of travel time, introducing crucial concepts and giving a thorough classification of the existing tech- niques. Most of the attention will focus on travel time estimation and travel time prediction, which are generally not presented together. The main goals of these models, the study areas and methodologies used to carry out these tasks will be further explored and categorized.

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[ES] En este estudio se describe el proceso seguido para la elaboración del auto-registro, diseñado específicamente para la medición de los estructos "deportividad”, “agresividad" y “violencia”. Este instrumento permite la recogida de información sobre actitudes y conductas relacionadas con la deportividad, la agresividad y la violencia de los diferentes agentes sociales que rodean a los jóvenes deportistas en categorías deportivas de formación (padres/espectadores, entrenadores y árbitros). Por otro lado, se detalla la estructura de este instrumento y las características psicométricas del mismo -validez y fiabilidad-.

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Idioma: Euskera Helburuak: 1) hipertentsio arterialaren tratamenduarekiko atxikidura baxuaren faktore eragileak identifikatzea eta 2) tratamenduarekiko atxikiduran erizaintza gomendio eta interbentzioen aztertzea Metodologia: PubMed eta Cochrane Library izan dira erabilitako datu base nagusiak. Inklusio kriterioen barne daude HTA pairatzen duten 18 urtetik gorako gizon eta emakumeak Konklusioa: HTAren tratamenduarekiko atxikidura falta magnitude handiko arazoa da. Horren gain eragina duten faktoreei dagokionez, faktore sozioekonomikoak, terapia eta pazientearen baldintzekin erlazionaturiko faktoreekin batera, funtsezko garrantzia izango dute HTAren tratamenduaren atxikiduran. Erizaintza gomendioak funtsezko papera dute atxikiduran. Erizaintza interbentzioei dagokionez, aurrerapen teknologikoekin erlazionaturiko entseguak, auto-zainketak, eredu biopsikosozialaren aplikazioak, pilula kopurua gutxitzeak eta tratamendu indibidualizatuak atxikiduraren gaineko hobekuntza frogatu dute.

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Eterio Pajares, Raquel Merino y José Miguel Santamaría (eds.)

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The hydrological response of a catchment to rainfall on different timescales is result of a complex system involving a range of physical processes which may operate simultaneously and have different spatial and temporal influences. This paper presents the analysis of streamflow response of a small humid-temperate catchment (Aixola, 4.8 km(2)) in the Basque Country on different timescales and discusses the role of the controlling factors. Firstly, daily time series analysis was used to establish a hypothesis on the general functioning of the catchment through the relationship between precipitation and discharge on an annual and multiannual scale (2003-2008). Second, rainfall-runoff relationships and relationships among several hydrological variables, including catchment antecedent conditions, were explored at the event scale (222 events) to check and improve the hypothesis. Finally, the evolution of electrical conductivity (EC) during some of the monitored storm events (28 events) was examined to identify the time origin of waters. Quick response of the catchment to almost all the rainfall events as well as a considerable regulation capacity was deduced from the correlation and spectral analyses. These results agree with runoff event scale data analysis; however, the event analysis revealed the non-linearity of the system, as antecedent conditions play a significant role in this catchment. Further, analysis at the event scale made possible to clarify factors controlling (precipitation, precipitation intensity and initial discharge) the different aspects of the runoff response (runoff coefficient and discharge increase) for this catchment. Finally, the evolution of EC of the waters enabled the time origin (event or pre-event waters) of the quickflow to be established; specifically, the conductivity showed that pre-event waters usually represent a high percentage of the total discharge during runoff peaks. The importance of soil waters in the catchment is being studied more deeply.

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121 p.

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La mastectomía, ya sea debida a un cáncer de mama o realizada profilácticamente, es considerada por muchas mujeres como un ataque a su feminidad e identidad, causando en ellas un gran impacto psicosocial que comprometerá su calidad de vida. Por un lado, la mastectomía afecta negativamente a algunos aspectos de su autopercepción como son su imagen corporal o su sexualidad. Por otro lado, sus relaciones sociales pueden verse perjudicadas, pudiendo resultar en una ruptura con sus parejas o en el cese de sus relaciones sexuales incluso tras la reconstrucción. Ante estos problemas, la enfermera debe ayudar a la mujer a adaptarse a esta nueva situación a través de unos cuidados individualizados que favorezcan su auto-aceptación y promuevan la reestructuración social. Sin embargo, muchas enfermeras reconocen una falta de conocimiento y dificultades comunicativas a la hora de abordar estos temas, así como una escasez de medios para poder realizarlo. Por todo ello, parece evidente la necesidad de una formación específica al respecto.