Now showing items 61-80 of 315

    • Small data existence for the Boltzmann Equation in $L^{1}$ 

      Galeano Andrades, Rafael; Ortega Palencia, Pedro; Vásquez Ávila, María Ofelia (2012-03-11)
      An existence theorem for the Boltzmann Equation with force term and small initial data is proved in an $L^{1}$ setting
    • Regularidad local del Mercado de índices para la crisis económica de 2008 

      Figliola, Alejandra; Rosenblatt, Mariel; Serrano, Eduardo P. (2012-03-08)
      There is evidence that signals from financial markets, such as stock indices, interest rates or commodities, have a multifractal nature. In recent years, many efforts have been made to relate the inefficiency of markets ...
    • On the Cramér–Von Mises Statistic 

      Martínez Camblor, Pablo; Carleos, Carlos; Corral, Norberto (2012-03-11)
      Probably, one of the most useful criterions in order to compare distribution functions is the one introduced by the researchers Harald Cramér and Richard Edler von Mises which is known as Cramérvon Mises criterion $(C_M)$. ...
    • Co-occurrence Matrix and fractal dimension for image segmentation 

      Marón, Beatriz S. (2012-03-08)
      One of the most important tasks in image processing problem and machine vision is object recognition, and the success of many proposed methods relies on a suitable choice of algorithm for the segmentation of an image. This ...
    • Joint Kalman–Haar Algorithm Applied to Signal Processing 

      Viegener, Alejandro; Sirne, Ricardo O.; Sirne, Ricardo O.; Serrano, Eduardo P.; Serrano, Eduardo P.; Fabio, Marcela; Fabio, Marcela; D'Attellis, Carlos E.; D'Attellis, Carlos E. (2012-03-08)
      Under the analysis of signals disturbed by noise, in this paper we propose a working methodology aimed to seize the best estimate of combining Kalman filtering with the characterization that is achieved by applying a ...
    • K-finite decidable objects and finite cardinals in an arbitrary topos 

      Acuña Ortega, Osvaldo (2012-03-08)
      In an elemetary topos $\varepsilo$, we prove that the class of K-finite decidable objects is the same to the class of finite cardinals in E if and only if every K-finite decidable object X such that $X \longrightarrow 1$ ...
    • Estimation of General Equilibium Model in Dynamic Economies using Markov Chain Monte Carlo Methods 

      Estévez, Gloria; Infante, Saba; Sáez, Francisco (2012-03-08)
      This paper describes a general procedure to do Bayesian inference based on the likelihood evaluation of the stochastic general equilibrium models (MEGE) through Markov Chain Monte Carlo methods (MCMC). The proposed methodology ...
    • Métodos de superficie Multirespuesta: Un Estudio Comparativo 

      de la Vara Salazar, Román; Domínguez Domínguez, Jorge (2011-04-29)
      The simultaneous optimization problem may not to have a complete satisfactory solution from the point of view of the individual responses, in the sense that individual optimums are different respect to global optimum; but ...
    • Modeling genetic algorithms with interacting particle systems 

      Del Moral, P.; Kallel, L.; Rowe, J. (2009-02-19)
      We present in this work a natural Interacting Particle System (IPS) approach formodeling and studying the asymptotic behavior of Genetic Algorithms (GAs). In thismodel, a population is seen as a distribution (or measure) ...
    • Teoría de nudos geométricos e isotopía poligonal 

      Calvo Soto, Jorge Alberto (2009-02-19)
      The space of n-sided polygons embedded in euclidean three-space consists of a smoothmanifold in which points correspond to piecewise linear or “geometric” knots, while pathscorrespond to isotopies which preserve the geometric ...
    • Estabilizacíon del modelo poblacional de may a través de controles direccionales 

      Delgado Andrade, Víctor (2009-02-19)
      The May population model consider a satiate parameter over the predators andhas an unstable equilibrium state surrounded by a limit cycle. This work gives acontrol strategy driven to disturb the model in such way that the ...
    • A method for analyzing turbulence models 

      Grebene, V. N.; Ilyushin, B. B. (2009-02-19)
      In this article we introduce a concept based on the differential constraints methodto examine the closure procedure in Turbulence Models. We show how this conceptmay be applied to study the problem of interaction and mixing ...
    • Some properties and inequalities related to the kth inverse moment of a positive binomial variate 

      Arias López, Rodrigo; Garrido, José (2009-02-19)
       We present some known properties of bk(n, p) the kth inverse moment of a positive binomial variate. Additional properties of this function and new bounds are derived. Keywords:  Probability, statistics, life contingencies, ...
    • Presentación e implementación del método de nubes dinámicas difuso 

      Mora Flores, Walter (2009-02-18)
      Se hace una presentación del método de Nubes Dinámicas Difuso considerando la variante del centro de gravedad (Forgy, 1965). La clasificación difusa obtenida se usa como herramienta de validación para establecer el número ...
    • Proposición de índices difusos en la clasificación jerárquica ascendente 

      Murillo Fernández, Álex; Trejos Zelaya, Javier (2012-03-29)
      En el artículo se proponen índices para selecciónar las particiones de una clasificación automática jerárquica ascendente, para dirigir la interpretación de jerarquías a las particiones más relevantes en un cierto sentido. ...
    • Estudio de las métricas inducidas por un análisis en componentes principales 

      Piza Volio, Eduardo (2009-02-18)
      En este artículo se estudia una amplia gama de métricas inducidas obtenidas al realizar un Análisis en Componentes Principales con fines exploratorios, así como algunas de sus consecuencias. Se demuestra que la aplicación ...
    • Análisis de las estructuras de opinión pública 

      Poltronieri Vargas, Jorge (2009-02-18)
      En este trabajo se presentan los resultados de los análisis hechos a través de nueve años de investigación de las estructuras de la opinión pública en Costa Rica. La interpretación y los comentarios se hacen desde una doble ...
    • Análisis evolutivo de la Opinión en Costa Rica: 1988-1991 

      Castillo Elizondo, William; González, Jorge (2012-03-29)
      En este artículo se utiliza el método Statis para analizar la evolución de la Opinión de los Costarricenses mayores de 18 años. Para tal efecto se usaron las encuestas anuales de opinión realizadas en el período 1988-1991, ...
    • Un análisis factorial de la asociación disimétrica entre dos variables cualitativas 

      Abdesselam, Rafik; Schektman, Yves (2012-03-29)
      Asymmetrical “relational association coefficients” are described. Measurements of these coefficients are expressed as inertia in the individual–space with a “relational inner product”. This geometrical and mechanical point ...
    • Algoritmos de punto fijo usando subdivisiones simpliciales 

      Azofeifa Z., Carlos E. (2009-02-18)
      In this paper we study an algorithm for approximating fixed points using simplicial subdivisions of the simplex. Furthermore, it is compared with algorithms of primitive sets.