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Search Results: 1 - 10 of 149520 matches for " Carla F?ster "
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Transferencia de la investigación educacional a la formación inicial de profesores
Marcela Lara,Carla Fster,Solange Gorichon
Calidad en la Educación , 2007,
Abstract: El artículo se refiere a la incidencia de la investigación educacional desarrollada por las universidades en los procesos curriculares de la formación inicial docente de pedagogíaen Educación Básica y Educación Parvularia. Las conclusiones dan cuenta del bajo nivel de transferencia de la investigación desarrollada por los docentes universitarios a la formación de pregrado y la evidente tensión entre investigación y docencia en laformación inicial de profesores.
A statistical comparison of three goodness-of-fit criteria used in modelling distances
Robert F. Love,Halit üster
Advances in Decision Sciences , 2001, DOI: 10.1155/s1173912601000177
Abstract: Distance predicting functions may be used in a variety of applications for estimating travel distances between points. To evaluate the accuracy of a distance predicting function and to determine its parameters, a goodness-of-fit criteria is employed. AD (Absolute Deviations), SD (Squared Deviations) and NAD (Normalized Absolute Deviations) are the three criteria that are mostly employed in practice. In the literature some assumptions have been made about the properties of each criterion. In this paper, we present statistical analyses performed to compare the three criteria from different perspectives. For this purpose, we employ the ℓkpθ-norm as the distance predicting function, and statistically compare the three criteria by using normalized absolute prediction error distributions in seventeen geographical regions. We find that there exist no significant differences between the criteria. However, since the criterion SD has desirable properties in terms of distance modelling procedures, we suggest its use in practice.
An External Description for MIMO Systems Sampled in an Aperiodic Way
Amparo Fúster-Sabater
Mathematics , 2010,
Abstract: An external description for aperiodically sampled MIMO linear systems has been developed. Emphasis is on the sampling period sequence, included among the variables to be handled. The computational procedure is simple and no use of polynomial matrix theory is required. This input/output description is believed to be a basic formulation for its later application to the problem of optimal control and/or identification of linear dynamical systems.
External Description for Multivariable Systems Sampled in an Aperiodic Way
Amparo Fúster-Sabater
Mathematics , 2010, DOI: 10.1109/9.192195
Abstract: An external description for nonperiodically sampled multivariable linear systems has been developed. Emphasis is on the sampling period sequence, included among the variables to be handled. The computational procedure is simple and no use of polynomial matrix theory is required. This input/output description is believed to be a basic formulation for its later application to the problem of optimal control and/or identification of linear dynamical systems.
Correction to "Generalized Self-Shrinking Generator"
Amparo Fúster-Sabater
Computer Science , 2010,
Abstract: In this correspondence, it is given a correction to Theorem 4 in Y. Hu, and G. Xiao, "Generalized Self-Shrinking Generator," IEEE Transactions on Information Theory, vol. 50, No. 4, pp. 714-719, April 2004.
Cellular Automata in Stream Ciphers
Amparo Fúster-Sabater
Computer Science , 2010,
Abstract: A wide family of nonlinear sequence generators, the so-called clock-controlled shrinking generators, has been analyzed and identified with a subset of linear cellular automata. The algorithm that converts the given generator into a linear model based on automata is very simple and can be applied in a range of practical interest. Due to the linearity of these automata as well as the characteristics of this class of generators, a cryptanalytic approach can be proposed. Linear cellular structures easily model keystream generators with application in stream cipher cryptography.
A Joint Criterion for Reachability and Observability of Nonuniformly Sampled Discrete Systems
Amparo Fúster-Sabater
Computer Science , 2010, DOI: 10.1109/9.100938
Abstract: A joint characterization of reachability (controllability) and observability (constructibility) for linear SISO nonuniformly sampled discrete systems is presented. The work generalizes to the nonuniform sampling the criterion known for the uniform sampling. Emphasis is on the nonuniform sampling sequence, which is believed to be an additional element for analysis and handling of discrete systems.
Characterization of the Least Periods of the Generalized Self-Shrinking Sequences
Amparo Fúster-Sabater
Computer Science , 2013,
Abstract: In 2004, Y. Hu and G. Xiao introduced the generalized self-shrinking generator, a simple bit-stream generator considered as a specialization of the shrinking generator as well as a generalization of the self-shrinking generator. The authors conjectured that the family of generalized self-shrinking sequences took their least periods in the set {1, 2, 2**(L-1)}, where L is the length of the Linear Feedback Shift Register included in the generator. In this correspondence, it is proved that the least periods of such generated sequences take values exclusively in such a set. As a straight consequence of this result, other characteristics of such sequences (linear complexity or pseudorandomness) and their potential use in cryptography are also analyzed.
La información y la lectura para presas políticas durante la dictadura militar en Uruguay
Fúster,Yanet; Langelán,Cecilia;
Revista Interamericana de Bibliotecología , 2010,
Abstract: based on a framework provided by library sciences and information sciences, this study explores the means of access to recreational and informational texts, and the use of these texts by female prisoners in the punta de rieles prison during the civil-military dictatorship in uruguay between 1973 and 1985. in a retrospective study of users, we gathered testimonies that reveal the meaning of reading as a means to transcend boundaries in a climate where basic freedoms were suppressed.
DFT-based transport calculations, Friedel's sum rule and the Kondo effect
P. Tr?ster,P. Schmitteckert,F. Evers
Physics , 2011,
Abstract: Friedel's sum rule provides an explicit expression for a conductance functional, $\mathcal{G}[n]$, valid for the single impurity Anderson model at zero temperature. The functional is special because it does not depend on the interaction strength $U$. As a consequence, the Landauer conductance for the Kohn-Sham (KS) particles of density functional theory (DFT) coincides with the true conductance of the interacting system. The argument breaks down at temperatures above the Kondo scale, near integer filling, $n_{\text{d}\sigma}\approx 1/2$ for spins $\sigma{=}\uparrow\downarrow$. Here, the true conductance is strongly suppressed by the Coulomb blockade, while the KS-conductance still indicates resonant transport. Conclusions of our analysis are corroborated by DFT studies with numerically exact exchange-correlation functionals reconstructed from calculations employing the density matrix renormalization group.
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