3,253 research outputs found
Density estimates on a parabolic spde
We consider a general class of parabolic spde's [formula] with (t, x) [member of] [0, T]×[0, 1] and [epsilon]Wt,x, [epsilon] > 0, a perturbed Gaussian space-time white noise. For (t, x) [member of] (0, T]×(0, 1) we prove the called Davies and Varadhan-Léandre estimates of the density p[epsilon]t,x of the solution u[epsilon]t,x
Combination Strategies for Semantic Role Labeling
This paper introduces and analyzes a battery of inference models for the
problem of semantic role labeling: one based on constraint satisfaction, and
several strategies that model the inference as a meta-learning problem using
discriminative classifiers. These classifiers are developed with a rich set of
novel features that encode proposition and sentence-level information. To our
knowledge, this is the first work that: (a) performs a thorough analysis of
learning-based inference models for semantic role labeling, and (b) compares
several inference strategies in this context. We evaluate the proposed
inference strategies in the framework of the CoNLL-2005 shared task using only
automatically-generated syntactic information. The extensive experimental
evaluation and analysis indicates that all the proposed inference strategies
are successful -they all outperform the current best results reported in the
CoNLL-2005 evaluation exercise- but each of the proposed approaches has its
advantages and disadvantages. Several important traits of a state-of-the-art
SRL combination strategy emerge from this analysis: (i) individual models
should be combined at the granularity of candidate arguments rather than at the
granularity of complete solutions; (ii) the best combination strategy uses an
inference model based in learning; and (iii) the learning-based inference
benefits from max-margin classifiers and global feedback
L'evolució de l'economia regional catalana entre 1960 i 1980
Aquest treball tracta de fer una primera anàlisi de l'evolució d'allò que podríem anomenar economia regional catalana al llarg de vint anys de la seva història recent, de 1960 a 1980, en base fonamentalment a la literatura especialitzada existent
Viure per pintar. J.Martínez Lozano (esbós d'un artista) (Thais Gómez Pol, Eduard Martínez Martínez)
Viure per pintar. J.Martínez Lozano (esbós d'un artista) (Thais Gómez Pol, Eduard Martínez Martínez
Estudio de las conductas de movimiento y postura de pacientes psiquiátricos mediante la técnica del Cluster Analysis
Voters' resources and electoral participation in Latin America
Previous studies of electoral participation in Latin America have focused on the political and
institutional factors that influence country differences in the aggregate level of turnout. This paper provides a
theoretical and empirical examination of the individual-level socio-economic factors that have an impact on
citizens’ propensity to vote. We assess the relevance of voters’ resources to explain electoral participation in
Latin America. We demonstrate that the demographic characteristics of voters (age and education) are strong
predictors of electoral participation in Latin America. Our analysis reveals that the individual objective
characteristics of the voters explain much more than individual subjective motivations and mobilization
networks
Estudio de las conductas de movimiento y postura de pacientes psiquiátricos mediante la técnica del 'Cluster Analysis'.
El objetivo de este trabajo es, por un lado, mostrar la utilidad de las tdcnicas estadísticas multivariantes, concretamente del analisis por con- glomerados (Cluster Analysis) para el estudio de la conducta no-verbal; y por otro, detectar las similitudes y difeencias comportamentales quepre- sentan varios sujetos con el mismo diagnóstico psiquiatrico. Los sujetos estudiados han sido ocho pacientes con diagnóstico de esquizofrenia (cua- tro hombres y cuatro mujeres), en una situación de entrevista familiar con el terapeuta. La estrategia de investigación es observacional, utilizando para la recogida de 10s datos un sistema de categorias elaborado teniendo en cuenta el aspecto estatico g dinámico de la conducta no-verbal, asicomo las diferentes zonas corporales en las cuales se pueden manifestar. Los re- sultados obtenidos han permitido agrupar a 10s sujetos según las similitu- des que presentaban con respecto a la tasa de movimiento y postura que manifestaban, la velocidad de ejecución de dichas manifestaciones y la va- riabilidad conductual en las sesiones analizadas. Palabras clave: Metodologia observacional, Conducta no-verbal, Ana- lisis de conglomerados
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