Search results for "similitud"
showing 10 items of 28 documents
M-theory, graphene-branes and superconducting wormholes
2017
Exploiting an M-brane system whose structure and symmetries are inspired by those of graphene (what we call a graphene-brane), we propose here a similitude between two layers of graphene joined by a nanotube and wormholes scenarios in the brane world. By using the symmetries and mathematical properties of the M-brane system, we show here how to possibly increase its conductivity, to the point of making it as a superconductor. The questions of whether and under which condition this might point to the corresponding real graphene structures becoming superconducting are briefly outlined.
Dynamic integration with random forests
2006
Random Forests (RF) are a successful ensemble prediction technique that uses majority voting or averaging as a combination function. However, it is clear that each tree in a random forest may have a different contribution in processing a certain instance. In this paper, we demonstrate that the prediction performance of RF may still be improved in some domains by replacing the combination function with dynamic integration, which is based on local performance estimates. Our experiments also demonstrate that the RF Intrinsic Similarity is better than the commonly used Heterogeneous Euclidean/Overlap Metric in finding a neighbourhood for local estimates in the context of dynamic integration of …
El viaje desde los cuestionarios Likert a los cuestionarios de elección forzosa: evidencia de la invarianza de los parámetros de los ítems
2019
Multidimensional forced-choice questionnaires are widely regarded in the personnel selection literature for their ability to control response biases. Recently developed IRT models usually rely on the assumption that item parameters remain invariant when they are paired in forced-choice blocks, without giving it much consideration. This study aims to test this assumption empirically on the MUPP-2PL model, comparing the parameter estimates of the forced-choice format to their graded-scale equivalent on a Big Five personality instrument. The assumption was found to hold reasonably well, especially for the discrimination parameters. In the cases in which it was violated, we briefly discuss the …
THE THEORIES AND PRACTICES OF LOPE AND MORATÍN: THE NEW THEATRE AND 'THE NEW PLAY'
2021
En este artículo, por primera vez, se ponen en relación las teorías teatrales de dos dramaturgos españoles que crearon escuela: Lope de Vega y Leandro Fernández de Moratín. Dos siglos separan sus creaciones, pero ambos pretendieron renovar la escena con sus poéticas, ambos pretendieron una «nueva comedia» que rompiera con las tradiciones teatrales inmediatamente anteriores. Las obras dramáticas de uno y otro autor, en realidad se sitúan en polos opuestos en cuanto a su extensión; la de Lope abarca más de cuatrocientos títulos, mientras que Moratín apenas tiene en su haber media decena de piezas. El más fecundo e internacional poeta dramático español y el más comedido de entre los dramaturgo…
Rotation-Invariant Texture Retrieval via Signature Alignment Based on Steerable Sub-Gaussian Modeling
2008
This paper addresses the construction of a novel efficient rotation-invariant texture retrieval method that is based on the alignment in angle of signatures obtained via a steerable sub-Gaussian model. In our proposed scheme, we first construct a steerable multivariate sub-Gaussian model, where the fractional lower-order moments of a given image are associated with those of its rotated versions. The feature extraction step consists of estimating the so-called covariations between the orientation subbands of the corresponding steerable pyramid at the same or at adjacent decomposition levels and building an appropriate signature that can be rotated directly without the need of rotating the im…
Efectos de la similitud superficial y estructural sobre la transferencia a partir de análogos en problemas de alta y baja familiaridad : primeros res…
2013
Se desarrollan dos estudios exploratorios para analizar el éxito en la transferencia en resolución de problemas a partir de análogos. Las diferentes analogías entre problemas «ejemplo» y «propuestos » se suponen construidas a partir de dos variables: la superficie y la estructura. Los resultados muestran que cuando los contextos de los problemas son familiares para los estudiantes, las analogías superficiales pueden ocultar las diferencias estructurales. Sin embargo, cuando los contextos de los problemas son no familiares para los estudiantes, el único efecto significativo procede de la igualdad/diferencia estructural. El efecto global de la familiaridad de los problemas es una reducción si…
Los componentes del discurso en la Suma collaciones o de ayuntamientos
2016
El presente trabajo pretende estudiar la articulación del discurso en el Communiloquium de Juan de Gales y en su traducción castellana: la Suma de collaciones o de ayuntamientos o Libro del gobernador (ms. 12181 de la BNE). Este tratado para ayuda de los predicadores se caracteriza por la hábil imbricación de diferentes fragmentos tomados de fuentes grecolatinas: sentencias, definiciones, argumentaciones, similitudines y exempla. Estos últimos son objeto de un especial análisis. El autor cierra la puerta a los provenientes de la experiencia personal o de la tradición oral y recoge fundamentalmente los protagonizados por personajes de la antigu?edad clásica. Este apego a la letra escrita pru…
L'Analogie chez Aristote
2021
Revue de philosophie dont l’objet est de montrer, d’interroger ou d’évaluer les comparaisons effectives dans les différents champs disciplinaires, Analogia est une publication scientifique annuelle de l’IPC.Chaque numéro réunit un conseil scientifique nouveau chargé de sélectionner les contributions en double aveugle.L’Analogie chez Aristote.Sous la direction d’Emmanuel Brochier.Conseil scientifique :- Katerina Ierodiakonou (Genève – Athènes)- André Laks (Paris)- Benjamin C. Morison (Princeton)- Jean-Luc Solère (Boston)Sommaire :- Présentation, par Emmanuel Brochier, p. 5 ;- Christof Rapp : "Spotting similarities between disparate items" Observations on the use of analogy in Aristotle’s met…
Are Neural Networks Imitations of Mind?
2015
Artificial neural networks are often understood as a good way to imitate mind through the web structure of neurons in brain, but the very high complexity of human brain prevents to consider neural networks as good models for human mind;anyway neural networks are good devices for computation in parallel. The difference between feed-forward and feedback neural networks is introduced; the Hopfield network and the multi-layers Perceptron are discussed. In a very weak isomorphism (not similitude) between brain and neural networks, an artificial form of short term memory and of acknowledgement, in Elman neural networks, is proposed.
El viaje desde los cuestionarios Likert a los cuestionarios de elección forzosa: evidencia de la invarianza de los parámetros de los ítems
2019
ABSTRACT Multidimensional forced-choice questionnaires are widely regarded in the personnel selection literature for their ability to control response biases. Recently developed IRT models usually rely on the assumption that item parameters remain invariant when they are paired in forced-choice blocks, without giving it much consideration. This study aims to test this assumption empirically on the MUPP-2PL model, comparing the parameter estimates of the forced-choice format to their graded-scale equivalent on a Big Five personality instrument. The assumption was found to hold reasonably well, especially for the discrimination parameters. In the cases in which it was violated, we briefly dis…