Revista de Matemática: Teoría y Aplicaciones
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Robustez de los índices de ajuste del análisis factorial confirmatorio a los valores extremos.
(2020)El objetivo de este trabajo es evaluar la robustez de varios índices de ajuste del Análisis Factorial Confirmatorio (SRMR, RMSEA, TLI, CFI y GFI) a la presencia de valores extremos. Para el alcance del objetivo se planteó ... -
A brief survey of Higgs bundles
(2019-06)Considering a compact Riemann surface of genus greater or equal than two, a Higgs bundle is a pair composed of a holomorphic bundle over the Riemann surface, joint with an auxiliar vector field, so-called Higgs field. This ... -
Estimaciones de pobreza para áreas pequeñas en Costa Rica: una aplicación de los estimadores de contracción de Jame-Setein
(2007)En este artículo se prueban dos posibles métodos para estimar la pobreza en áreas pequeñas, los cuales se utilizaron para corregir los estimadores directos de las encuestas periódicas, apoyándose en la estimación censal. ... -
Simplificación del gradiente de la función de máxima verosimilitud del análisis factorial confirmatorio
(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
(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
(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
(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 ... -
TABU SEARCH WITH ASPIRATION CRITERION FOR THE TIMETABLING PROBLEM
(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 ... -
Cognitive rhythms and evolutionary algorithms in university timetables scheduling
(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 ... -
Selective methodology of population dynamics for optimizing a multiobjective environment of job shop production
(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 ... -
An adaptive wavelet-galerkin method for parabolic partial differentia equations
(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 ... -
OPTIMAL PRODUCTION–SALES STRATEGIES FOR A COMPANY AT CHANGING MARKET PRICE
(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 ... -
Local convergence of exact and inexact newton’s methods for subanalytic variational inclusions
(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 ... -
Special software for computing the special functions of wave catastrophes
(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 ... -
Infinitely oscillating wavelets and a efficient implementation algorithm based the FFT
(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 ... -
Fourier coefficientes computation in two variables, a distributional version
(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 ... -
MORTALITY AMONG YOUNG NICARAGUAN IMMIGRANTS TO COSTA RICA: AN APPLICATION OF GEOGRAPHICALLY WEIGHTED STATISTICAL REGRESSION
(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 ... -
INTERACTIVE MULTIOBJECTIVE TABU/SCATTER SEARCH BASED ON REFERENCE POINT
(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 ... -
NONLINEAR FILTERS TO RECONSTRUCT ELECTROCARDIOGRAM SIGNALS
(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
(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 ...
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