Now showing items 190-209 of 319

    • Métodos de optimización del stress. Comparaciones usando disimilitudes tipo intervalo 

      Castillo Elizondo, William; González, Jorge; Rodríguez Rojas, Oldemar (2009-02-20)
      By the use of simulated annealing it is defined the algorithm MDSI-SS for the optimization of Stress defined by Donoeux and Masson [6] for interval-type dissimilarities.On three data sets it is compared the value of stress ...
    • Métodos de punto interior para optimización cuadrática convexa con matrices no definidas positivas 

      Palencia F., Gonzalo; Hing C., Rosina; Rojas C., Mariledy; Medina S., Denysde (2009-02-25)
      In this article a modification of the recursive algorithm of Cholesky is obtainedthat allows the factorization of Semi Definite Positive Matrices, even though theseare not positive defined, without increasing the computational ...
    • 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 ...
    • Métodos no estándar en el problema de la parada óptima 

      Lobo Segura, Jaime (2009-02-18)
      We analize the optimal-stopping ploblem by the use of non standard analysis techniques. Using the non standard concept of quasi-optimal time, we prove the existence of optimal times for the problems of finite and infinite ...
    • Minimal Reducts with Grasp 

      Mendez Gurrola, Iris Iddaly; Laureano Cruces, Ana Lilia; Ramírez Rodríguez, Javier (2011-03-18)
      The proper detection of patient level of dementia is important to offer the suitable treatment. The diagnosis is based on certain criteria, reflected in the clinical examinations. From these examinations emerge the limitations ...
    • Minimization of the first eigenvalue in problems involving the bi-laplacian 

      Anedda, Claudia; Cuccu, Fabrizio; Porru, Giovanni (2009-02-27)
      This paper concerns the minimization of the first eigenvalue in problems involvingthe bi-Laplacian under either homogeneous Navier boundary conditions or homogeneousDirichlet boundary conditions. Physically, in case of N ...
    • Mmds and 2d scattering problem by cylindrical structure with piece-wise smooth boundary 

      Anyutin, Alexander P.; Stasevich, V.I. (2009-02-20)
      An universal modification of the method of discrete sources (MMDS) was appliedfor solving 2D Dirichlet or Neumann boundary problem when the scatterer’s contour isa piece-wise smooth contour. The problems of accuracy, ...
    • 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) ...
    • Modelo Multifractal Aplicado al Riego 

      Mercado Escalante, José Roberto; Aldama R., Álvaro Alberto; Íñiguez C., Mauro; Mejía G., Miguel Ángel (2012-03-02)
      We define the binomial multifractal distribution as an expression of a law of small numbers. We studied a form of evaluation or design of a distribution system in an irrigation district by determining its conduction capacity ...
    • Modelos aditivos y multiplicativos en el análisis de matrices multitrazos - multimétodos de cuestionarios de intereses profesionales 

      Ruhel, Jacques; Marivain, Thierry (2009-02-18)
      The psychologist needs the evaluation of the conceptual validity (convergent and discriminant) of psychological constructions, used for describing and explaining the organization of his observations. In this work, we ...
    • Modelos minimales de la recta hiperreal 

      Alvarado Jiménez, William (2009-02-18)
      A new proof of the existence of minimal models of the hiperreal line is obtained in terms of a combinatorial property of Ramsey ultrafilters over a countable set.
    • MORTALITY AMONG YOUNG NICARAGUAN IMMIGRANTS TO COSTA RICA: AN APPLICATION OF GEOGRAPHICALLY WEIGHTED STATISTICAL REGRESSION 

      Bonilla Carrión, Róger Enrique; Chavarría, Juan B. (2014-07-01)
      This paper applies a geographically weighted statistical regression (GWR) model to young Nicaraguan immigrant homicides in Costa Rica during the period 1998-2008 and identifies possible covariates. The pa- rameters for the ...
    • Nautelia: sistema automatizado para el ruteo náutico meteorológico 

      Cordero Hernández, Yovany; Fernández Castillo, Karelia; Baguer Díaz-Romañach, Marta L.; Calnick, Anneris; Borrajeros, Israel (2009-02-25)
      For the captain of a ship, it is very important to have a proposal of the routethat allows him to reach the desired destiny as soon as possible, taking into accountweather conditions. In order to find such a route a former ...
    • New geometrical compactness measures for zones design 

      Rincón García, Eric Alfredo; Gutiérrez Andrade, Miguel Ángel; de los Cobos Silva, Sergio Gerardo; Lara Velázquez, Pedro (2012-07-01)
      The design of compact zones has been studied because of its influence in the creation of zones with regular forms, which are easier to analyze, to investigate or to administer. This paper propose a new method to measure ...
    • New results with scatter search applied to multiobjective combinatorial and nonlinear optimization problems 

      Beausoleil, Ricardo P. (2009-02-20)
      This paper introduces two variants of a multiple criteria scatter search to deal withnonlinear continuous and combinatorial problems, applying a tabu search approach asa diversification generator method. Frequency memory ...
    • NONLINEAR FILTERS TO RECONSTRUCT ELECTROCARDIOGRAM SIGNALS 

      Infante, Saba; Sánchez, Luis; Cedeño, Fernando (2014-07-01)
      ECG signals have been used in cardiac pathology to detect disease heart. The main objective of this paper is to propose signal filtering techniques to reduce noise, extract information, to reconstruct the states and ...
    • Nuevas técnicas de particionamiento en clasificación automática 

      Piza Volio, Eduardo; Murillo Fernández, Álex; Trejos Zelaya, Javier (2009-02-18)
      In this article there are exposed some new thechniques for hte search of global optima inthe partitioning problem in Cluster Analysis. With these thechniques the results are sensibly improved with respect to the traditional ...
    • Obtención de la fórmula de la Variancia del Estadístico de la Dócima de rangos de Wilcoxon-Mann-Whitney 

      Pastrana, José Francisco (2012-03-21)
      En este artículo se deriva la fórmula de , en donde es el estadístico de la dócima de Wilcoxon-Mann-Whitney, para probar la hipótesis de igualdad de las distribuciones de dos poblaciones. El propósito es brindar detalles ...
    • On a variational principle for shape optimization and elliptic free boundary problems 

      González De Paz, Raúl B. (2009-02-18)
      A variational principle for several free boundary value problems using a relaxation approach is presented. The relaxed Energy functional is concave and it is defined on a convex set, so that the minimizing points are ...
    • 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 $(C_M)$. ...