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In this work, we evaluate the sensitivity of Gaussian Bayesian networks to perturbations or uncertainties in the regression coefficients of the network arcs and the conditional distributions of the variables. The Kullback–Leibler divergence measure is used to compare the original network to its perturbation. By setting the regression coefficients to zero or non-zero values, the proposed method can remove or add arcs, making it possible to compare different network structures. The methodology is implemented with some case studies., Spanish Ministerio De Ciencia E Innovacion[MTM 2008-03282]; BSCH-UCM From Spain[GR58/08-A, 910395], Depto. de Estadística e Investigación Operativa, Fac. de Ciencias Matemáticas, TRUE, pub

© 2002 SPIE and IS&T. The authors are grateful to Vicente Palanca, from Kinossel S.L., for his support and facilities in this work., When estimating the standard deviation of a magnitude with spatial dependence, it is necessary to carry out several measurements at every location where the magnitude is estimated. However, in image applications the standard deviation is commonly measured by means of only one high-uniform image. This procedure tends to increase the standard deviation due to spatial nonuniformity of the image. In this work we propose a new technique based on the variogram, which is a function that measures the spatial correlation of the image, that can be employed to accurately estimate the standard deviation of nonuniform images obtained by charge-coupled device cameras., Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

In this paper, we introduce a timed extension of the extended finite state machines model. On one hand, we consider that (output) actions take time to be performed. This time may depend on several factors, such as the value of variables. On the other hand, our formalism allows us to specify time-outs. In addition to presenting our language, we develop a testing theory. First, we define 10 timed conformance relations and relate them. Second, we introduce a notion of timed test and define how to apply tests to implementations. Finally, we give an algorithm to derive sound and complete test suites with respect to the implementation relations presented in the paper. This paper represents an extended and improved version of, MEC, Sección Deptal. de Sistemas Informáticos y Computación, Fac. de Ciencias Matemáticas, TRUE, pub