• Simplificación del gradiente de la función de máxima verosimilitud del análisis factorial confirmatorio 

  Rojas Torres, Luis (2016-08-04)

  En este artículo se presenta el proceso de simplificación del gradiente de la función de máxima verosimilitud, utilizada en la estimación del Análisis Factorial Confirmatorio. El gradiente obtenido se presenta en función ...

• The role of short-term immigration on disease dynamics: An SIR model with age-structure 

  Sánchez Peña, Fabio Ariel; Calvo Alpízar, Juan Gabriel (2019-02-18)

  We formulate an age-structured nonlinear partial differential equation model that features short-term immigration effects in a population. Individuals can immigrate into the population as any of the three stages in the ...

• Algunas soluciones exactas para la ecuación unidimensional de fokker-planck usando simetrías de lie 

  Ortíz Álvarez, Hugo Hernán; Jiménez García, Francy Nelly; Posso Agudelo, Abel Enrique (2015-01-01)

  La ecuación de Fokker Planck aparece en el estudio de fenómenos de difusión, procesos estocásticos y mecánica clásica y cuantica. Un caso particular de esta ecuación, ut − uxx − xux − u = 0, es analizada empleando el método ...

• Times of analgesic efficacy of two drugs in the treatment of patients with renal-ureteral colic compared by survival models 

  Reyes Velázquez, Luis; Ulín Montejo, Fidel; Pérez Chavez, Jorge Alejandro; Salinas Hernández, Rosa María; Torres López, Jorge Elías (2015-01-01)

  Renourethral colic is a very painful clinical situation that requires a quick diagnosis and treatment. A study was done with patients who were administered two types of analgesics, and whose pain was measured through a ...

• Cognitive rhythms and evolutionary algorithms in university timetables scheduling 

  Castrillón, Omar Danilo (2015-03-18)

  The main purpose of this research is to design a methodology based on evolutionary algorithms to university timetable scheduling. This methodology will consider the students’ cognitive rhythms, which establish that teaching ...

• TABU SEARCH WITH ASPIRATION CRITERION FOR THE TIMETABLING PROBLEM 

  Chávez Bosquez, Oscar; Pozos Parra, Pilar; Gómez Ramos, José Luis (2015-01-01)

  The aspiration criterion is an imperative element in the Tabu Search, with aspiration-by-default and the aspiration-by-objective the mainly used criteria in the literature. In this paper a new aspiration criterion is ...

• An adaptive wavelet-galerkin method for parabolic partial differentia equations 

  Vampa, Victoria; Martín, María T. (2015-01-01)

  In this paper an Adaptive Wavelet-Galerkin method for the solution of parabolic partial differential equations modeling physical problems with different spatial and temporal scales is developed. A semi-implicit time ...

• Selective methodology of population dynamics for optimizing a multiobjective environment of job shop production 

  Ruiz, Santiago; Castrillón, Omar Danilo; Sarache, William Ariel (2015-03-18)

  This paper develops a methodology based on population genetics to improve the performance of two or more variables in job shop production systems. The methodology applies a genetic algorithm with special features in the ...

• OPTIMAL PRODUCTION–SALES STRATEGIES FOR A COMPANY AT CHANGING MARKET PRICE 

  Grigorieva, Ellina V.; Khailov, Evgenii N. (2015-01-01)

  In this paper we consider a monopoly producing a consumer good of high demand. Its market price depends on the volume of the produced goods described by the Cobb-Douglas production function. A production-sales activity of ...

• Special software for computing the special functions of wave catastrophes 

  Kryukovsky, Andrey S.; Lukin, Dmitry S.; Rogachev, Sergey V. (2015-01-01)

  The method of ordinary differential equations in the context of calculating the special functions of wave catastrophes is considered. Complementary numerical methods and algorithms are described. The paper shows approaches ...

• Fourier coefficientes computation in two variables, a distributional version 

  Ulata R., Carlos Manuel (2015-01-01)

  The present article, by considering the distributional summations of Euler-Maclaurin and a suitable choice of the distribution, results in repre- sentations for the Fourier coefficients in two variables are obtained. These ...

• Infinitely oscillating wavelets and a efficient implementation algorithm based the FFT 

  Fabio, Marcela; Serrano, Eduardo P. (2015-01-01)

  In this work we present the design of an orthogonal wavelet, infinitely oscillating, located in time with decay 1/|t|n and limited-band. Its appli- cation leads to the signal decomposition in waves of instantaneous, well ...

• Local convergence of exact and inexact newton’s methods for subanalytic variational inclusions 

  Cabuzel, Catherine; Pietrus, Alain; Burnet, Steeve (2015-01-01)

  This paper deals with the study of an iterative method for solving a variational inclusion of the form 0 ∈ f (x)+F (x) where f is a locally Lipschitz subanalytic function and F is a set-valued map from Rn to the closed ...

• INTERACTIVE MULTIOBJECTIVE TABU/SCATTER SEARCH BASED ON REFERENCE POINT 

  Beausoleil, Ricardo P. (2014-07-01)

  This paper presents multiobjective tabu/scatter search architecture with preference information based on reference points for problems of contin- uous nature. Features of this new version are: its interactive behavior, its ...

• MORTALITY AMONG YOUNG NICARAGUAN IMMIGRANTS TO COSTA RICA: AN APPLICATION OF GEOGRAPHICALLY WEIGHTED STATISTICAL REGRESSION 

  Bonilla Carrión, Roger E.; 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 ...

• 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 ...

• MATHEMATICAL MODEL FOR TOXIN TRANSPORT IN A MARINE FOOD CHAIN 

  Arbeláez A., Daniel; Ruiz V., Jorge Mauricio (2014-07-01)

  Some cases of poisoning by consumption of contaminated fish, like the Ciguatera poisoning, occur unexpectedly and they are not easy to detect previously since the fish that carry the toxin do not have appearance and/or ...

• GEODESIC DISTRIBUTION IN GRAPH THEORY: KULLBACK-LEIBLER-SYMMETRIC 

  González, José Alejandro; Cascone, Marcos Henrique (2014-07-01)

  Kullback-Leibler information allow us to characterize a family of dis- tributions denominated Kullback-Leibler-Symmetric, which are distance functions and, under some restrictions, generate the Jensen’s equality shown by ...

• LENSING PROPERTIES OF THE EINASTO PROFILE IN TERMS OF THE MEIJER G FUNCTION 

  Retana Montenegro, Edwin; Frutos Alfaro, Francisco (2014-07-01)

  In N-body simulations of cold dark matter, it has been found that three-parameter models, particularly the Einasto profile, yield better fits to a wide range of dark matter haloes than two parameter models like the ...

• SUPERIOR ORDER G -STRUCTURES 

  Rosales Ortega, José (2014-07-01)

  In this article we study the basic facts about superior order G-structures, then we show that the set of infinitesimally automorphisms of a geometric G-structure is a closed Lie group. 

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