Revista de Matemática: Teoría y Aplicaciones
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Dengue model with early-life stage of vectors and age-structure within host
(2019-12)We construct an epidemic model for the transmission of dengue fever with an early-life stage in the vector dynamics and age-structure within hosts. The early-life stage of the vector is modeled via a general function that ... -
Transmission dynamics of Dengue in Costa Rica: The role of hospitalizations
(2019-12)For decades, dengue virus has caused major problems for public health officials in tropical and subtropical countries around the world. We construct a compartmental model that includes the role of hospitalized individuals ... -
Climate-Driven Statistical Models as Effective Predictors of Local Dengue Incidence in Costa Rica: A Generalized Additive Model and Random Forest Approach
(2019-12)Climate has been an important factor in shaping the distribution and incidence of dengue cases in tropical and subtropical countries. In CostaRica, a tropical country with distinctive micro-climates, dengue has been endemic ... -
A Two-Patch Epidemic Model with Nonlinear Reinfection
(2019-12)The propagation of infectious diseases and its impact on individuals play a major role in disease dynamics, and it is important to incorporate population heterogeneity into efforts to study diseases. As a simplistic but ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ...
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