Envíos recientes

  • Using generalized logistics regression to forecast population infected by Covid-19 

    Villalobos Arias, Mario Alberto (2020-04-05)
    In this work, a proposal to forecast the populations using generalized logistics regression curve fitting is presented. This type of curve is used to study population growth, in this case population of people infected ...
  • Estimación de población contagiada por Covid-19 usando regresión Logística generalizada y heurísticas de optimización 

    Villalobos Arias, Mario Alberto (2020-04-02)
    En este trabajos se presenta una propuesta para la estimación de la poblaciones usando ajuste de curvas del tipo logística. Este tipo de curvas se utilizan para el estudio de crecimiento de poblaciones, en este casos ...
  • Geometric goodness of fit measure to detect patterns in data point clouds 

    Hernádez Alvarado, Alberto Jose; Solís Chacón, Maikol; Zúñiga Rojas, Ronald Alberto (2019)
    The curse of dimensionality is a commonly encountered problem in statistics and data analysis. Variable sensitivity analysis methods are a well studied and established set of tools designed to overcome these sorts of ...
  • Asymptotic expansion of the invariant measure for ballistic random walk in the low disorder regime 

    Campos Fernández, José David; Ramírez Chuaqui, Alejandro Francisco (2015)
    We consider a random walk in random environment in the low disorder regime on Zd. That is, the probability that the random walk jumps from a site x to a nearest neighboring site x+e is given by p(e)+ǫξ(x,e), where p(e) is ...
  • Esquemas en grupos y torsores 

    Esquivel Araya, Jorge Arturo (2019)
    El principal objetivo es analizar la extensión de un G-torsor dado sobre la fibra genérica de X, donde X=AnRes el espacio afín n-dimensional sobre un anillo de valuación discreta R. Para ello primero se estudiará ...
  • Procesos de Levy Cilíndricos: Regularización e Integración 

    Alvarado Solano, Anddy Enrique (2020)
    Para la presentación de los resultados de plantea una estructura de una tesis compuesta de 4 capítulos. Dichos capítulos están descritos acontinuación. En el Capítulo 1 se presentan algunos preliminares necesarios para ...
  • Implementación de una plataforma computacional para la solución de PDE's elípticas, mediante FEM y descomposición de dominios BDDC. 

    Mora Cordero, Fabian (2019)
    En este trabajo se desarrolla una plataforma computacional en C++-CUDA, la cual introduce una serie de estructuras de datos que simplifican el manejo de memoria en CUDA. En la plataforma también se introducen elementos de ...
  • A Geometric Splitting Theorem 

    Rosales Ortega, José (2019)
    Let G = G1...Gl be a connected noncompact semisimple Lie group with Lie algebra g = g_1+g_2+....+ g_l acting topologically transitive on a manifold M. We obtain a geometric splitting of the metric on M that consider ...
  • REVISTA SERENGUETI 2(1) 

    Valerio Salas, Ericka; García Calvo, Susana; Vargas Montero, Andrea; Salas Obando, Joshua; Aguilar Umaña, José Pablo; Alvarado Prado, Fernando; Hernández Orama, Daniely; Chavarría Guevara, Daniela; Jiménez Mena, Noelia; Zarate Artavia, Gabriel; Herrera Delgado, Shirley; Rojas Ramírez, Noelia; Solís Quirós, María José; Quirós Gómez, Luis Diego; Montero Solórzalo, Juan José; Solera Vázquez, Silvia; Gómez Quesada, Dayana; Reyes Peña, Jesús; Fallas Godìnez, José Alejandro; Vargas Herrera, Moisés (2019-12)
    Se destaca, de manera general, que la revista Serengueti se compone como una herramienta capaz de incentivar la participación estudiantil, en el cual principalmente se tiene como fin evidenciar y reconocer los esfuerzos ...
  • Models of torsors over affine spaces 

    Antei, Marco; Esquivel Araya, Jorge Arturo (2019)
    Let X := A n R be the n-dimensional affine space over a discrete valuation ring R with fraction field K. We prove that any pointed torsor Y over A n K under the action of an affine finite-type group scheme can be extended ...
  • Nori fundamental gerbe of essentially finite covers and Galois closure of towers of torsors 

    Antei, Marco; Biswas, Indranil; Emsalem, Michel; Tonini, Fabio; Zhang, Lei (2019)
    We prove the existence of a Galois closure for towers of torsors under finite group schemes over a proper, geometrically connected and geometrically reduced algebraic stack X over a field k. This is done by describing the ...
  • The pseudo-fundamental group scheme 

    Antei, Marco; Dey, Arijit (2019)
    Let X be any scheme defined over a Dedekind scheme S with a given section x ∈ X (S). We prove the existence of a pro-finite S-group scheme א (X,x) and a universal א (X,x)-torsor dominating all the pro-finite pointed torsors ...
  • Notas de lógica EMALCA 2019 

    Zamora Calero, Rafael (2019)
    Estas notas fueron utilizadas en el curso Introducción a la Lógica durante la EMALCA organizada por el CIMPA en la sede del Atlántico en 2019. La lógica matemática es un área de matemática que estudia el lenguaje formal ...
  • Location of the zeros of certain parametric families of functions of generalized Fresnel integral type 

    Lobo Segura, Jaime; Villalobos Arias, Mario Alberto (2019)
    In this paper, two parametric families of functions, the so-called Complementary Fresnel Integral and the Lommel type, which are of generalized Fresnel integral type, are considered. We review the problems of existence ...
  • Las partículas elementales según Wigner: aspectos clásicos y cuánticos 

    Várilly Boyle, Joseph C. (2019)
    En 1939, Wigner clasificó las representaciones unitarias irreducibles del grupo de Poincaré; desde entonces, tales representaciones se identifican con partículas con simetría relativista. Se conocen las representaciones ...
  • Isometry groups of borel randomizations 

    Berenstein, Alex; Zamora Calero, Rafael (2018-08)
    We study global dynamical properties of the isometry group of the Borel randomization of a separable complete structure. In particular, we show that if properties such as the Rohklin property, topometric generics, extreme ...
  • On the approximation of a virtual coarse space for domain decomposition methods in two dimensions 

    Calvo Alpízar, Juan Gabriel (2018)
    A new extension operator for a virtual coarse space is presented which can be used in domain decomposition methods for nodal elliptic problems in two dimensions. In particular, a two-level overlapping Schwarz algorithm is ...
  • A BDDC algorithm with deluxe scaling for H(curl) in two dimensions with irregular subdomains 

    Calvo Alpízar, Juan Gabriel (2015)
    A bound is obtained for the condition number of a BDDC algorithm for problems posed in H(curl) in two dimensions, where the subdomains are only assumed to be uniform in the sense of Peter Jones. For the primal variable ...
  • An overlapping Schwarz method for virtual element discretizations in two dimensions 

    Calvo Alpízar, Juan Gabriel (2019)
    A new coarse space for domain decomposition methods is presented for nodal ellipticproblems in two dimensions. The coarse space is derived from the novel virtual elementmethods and therefore can accommodate quite irregular ...
  • A new coarse space for overlapping Schwarz algorithms for H(curl) problems in three dimensions with irregular subdomains 

    Calvo Alpízar, Juan Gabriel (2019)
    A new coarse space for a two-level overlapping Schwarz algorithm is presented for problems posed in three dimensions in the space H(curl, Ω). Previous studies for these methods are very restrictive about the geometry of ...

Más