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1
tesis de maestría
Desarrolla un programa de computadora en Quick Basic que permita el cálculo y optimización del corte y relleno de material en proyectos lineales como carreteras, canales, vías férreas, etc. El programa provee una plataforma amigable de fácil uso que permite calcular y optimizar rápidamente el material de excavación, relleno, así como el material de préstamo de canteras y eliminación de material excedente en botaderos designados.
2
artículo
Publicado 2016
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In this work we will analyze the stability of linear systems governed by a Markov chain, this family is known in the specialized literature as linear systems with Markov jumps or by its acronyms in English MJLS as it is denoted in [1]. Linear systems governed by a Markov chain are dynamic systems with abrupt changes. We give some denitions of stability for the MJLS system, where these types of stability are equivalent as long as the state space of the Markov chain is finite.Finally we present a theorem that characterizes the stochastic stability by means of an equation of the Lyapunov type. The result is a generalization of a theorem in classical theory.
3
artículo
Publicado 2016
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In this work we will analyze the stability of linear systems governed by a Markov chain, this family is known in the specialized literature as linear systems with Markov jumps or by its acronyms in English MJLS as it is denoted in [1]. Linear systems governed by a Markov chain are dynamic systems with abrupt changes. We give some denitions of stability for the MJLS system, where these types of stability are equivalent as long as the state space of the Markov chain is finite.Finally we present a theorem that characterizes the stochastic stability by means of an equation of the Lyapunov type. The result is a generalization of a theorem in classical theory.
4
tesis doctoral
Publicado 2018
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En esta tesis, los principales objetivos son establecer: i) La controlabilidad local exacta por trayectorias para EDPs parabólicas como no linealidad no local, en un dominio limitado y con el control distribuido. También vamos a probar la controlabilidad local exacta por trayectorias para EDPs parabólicas con no linealidad no local y con el control en la frontera en dimensión 1 respecto a la variable espacial. ii) La controlabilidad local nula del sistema N—dimensional de Ladyzhenskaya-Smagorinsky con N — 1 controles escalares en un dominio arbitrario del control. iii) La controlabilidad local nula del “verdadero“ sistema N—dimensional de Boussinesq. iv) Un resultado de controlabilidad global nula aproximada del verdadero“ sistema de Boussinesq en dimensión 3. v) El control jerárquico siguiendo la estrategia de Stackelberg-Nash para una EDP parabólica no lineal, en un ...
5
artículo
The concept of eigenvalues is associated with the linearity one, through the structure of vectorial space. The multiplicative linear algebra is a structure in which an expression such as x^3y^2 can be considered a linear combination of variables x and y. This article is reserved to show the corresponding analogues for an Eigenvalue Theory. We exemplify its applications by introducing a connection with the analysis of a nonlinear dynamical system in the standard sense, although a linear recurrence in the multiplicative one.
6
artículo
Publicado 2012
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In the present’s paper studying a strategy for a typo of convex problem, we treat a linear programming problem whose coefficient of decision variables in the objective function has a nonlinear behavior. When the coefficients are constant the Simplex Method solves these problems without much difficulty, but when the coefficients are no longer constant and the Simplex does not work. We propose a technique that exploits the convex behavior of these coefficients and uses the theory of approximation by piecewise linear functions.
7
artículo
Publicado 2022
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In this paper we are going to develop an unpublished argument of William Thurston that shows the existence of hyperbolic groups with no non-trivial representations to linear groups over any ring, for a given dimension. His approach studies the space of representations of any non-elementary hyperbolic group G to conclude that there is a hyperbolic quotient with such property.
8
artículo
Publicado 2016
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Our environment has changed. We live in a real and virtual society, where new Information and Communications Technology (ICT) offers us various possibilities of information generation and transmission, getting through geographical and cultural barriers and crossing the world in record time. The digital revolution is not over and the media ecosystem as a consequence has not stabilized yet. The increasing use of media and ICT has put traditional media in crisis within the transformation of the Advertising industry context and the alternative funding and business practices. Therefore, this article presents a critical analysis on Advertising and the new narratives, trying to find adequate bibliographical support to study the path from linearity to transmediality.
9
artículo
Publicado 2016
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Our environment has changed. We live in a real and virtual society, where new Information and Communications Technology (ICT) offers us various possibilities of information generation and transmission, getting through geographical and cultural barriers and crossing the world in record time. The digital revolution is not over and the media ecosystem as a consequence has not stabilized yet. The increasing use of media and ICT has put traditional media in crisis within the transformation of the Advertising industry context and the alternative funding and business practices. Therefore, this article presents a critical analysis on Advertising and the new narratives, trying to find adequate bibliographical support to study the path from linearity to transmediality.
10
tesis doctoral
Publicado 2018
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Descargue el texto completo en el repositorio institucional de la Universidad Federal Fluminense: https://app.uff.br/riuff/handle/1/12750
11
artículo
Publicado 2021
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The generalized QR factorization, also known as GQR factorization, is a method that simultaneously transforms two matrices A and B in a triangular form. In this paper, we show the application of GQR factorization in solving linear equality-constrained least square problems; in addition, we explain how to use GQR factorization for solving quaternion least-square problems through the matrix representation of quaternions.
12
artículo
Publicado 2007
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The equations that govern the behavior of some of the equations of Physics-Mathematics, such as elastic, acoustic and electromagnetic waves, can be reduced to systems of first order PDE's, which result from operating on a second order hyperbolic PDE. In order to solve numerically this type of equations, they can be taken to this type of linear systems of PDE's. Our objective in this article is to present a technique for the transformation of the hyperbolic second order PDE to a linear system of first order PDE's, for the case of any wave equation, as well as the decoupling of such system to reduce them to independent first order PDE's and thus define the domain of dependence of the system, in order to determine the geometric place where it will allow to establish the existence and uniqueness of solution of the initial value problem or Cauchy, associated to the system.
13
tesis de maestría
Publicado 2013
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Alguns problemas parabólicos podem ser reescritos na forma de problema de complementaridade e aparecem em muitas aplicações como em fluxos de líquidos no interior num domínio, difusão, fluxo de calor envolvendo mudança de fase e reações químicas. Estes tipos de problemas apresentam muitas dificuldades analíticas e numéricas, normalmente devido à evolução no tempo ou fronteira móvel. Como a solução analítica é muito difícil de obter, é importante o estudo de métodos numéricos que permitam a busca de uma solução aproximada da solução exata para tais tipos de problemas. Estuda-se leis de conservação e os tipos de soluções associadas ao Problema de Riemann, essencialmente leis de balanço que expressam o fato de que alguma substância é conservada. O estudo desta teoría é importante porque frequentemente as leis de conservação aparecem quando nos problema...
14
artículo
Publicado 2010
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En este trabajo estamos interesados con la existencia de soluciones fuertes y decaimiento exponencial de la energía total para el problema de valores iniciales en la frontera asociado a la ecuación de onda con término fuente no lineal y amortiguación en la frontera. Los resultados son probados en términos del método potencial, la técnica de multiplicación y el conveniente teorema de única continuación para la ecuación de onda con coeficientes variables.
15
tesis de grado
Publicado 2025
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La presente tesis propone la implementación del algoritmo Practical Non-linear Model Predictive Control (PNMPC) para controlar el lazo de nivel del Módulo de laboratorio FESTO, el cual se compone de un sistema de dos tanques en cascada conectados por un circuito cerrado donde fluye agua. El PNMPC es un algoritmo de control que soluciona el problema de la no linealidad de los sistemas de nivel sin comprometer el rendimiento del proceso control. Para llevar a efecto esta estrategia de control se ha escrito un código en MATLAB que envía y recibe datos de la planta mediante la arquitectura de comunicación OPC UA a un PLC, que se encarga de operar los componentes del Módulo FESTO. También, se aplicó técnicas de control, usualmente, vistas en los cursos de automatización tales como el controlador PI y el controlador Generalize Predictive Control (GPC) para comparar su rendimiento con...
16
artículo
In this paper we consider the nonlinear transmission problem for the wave equation with time dependent coefficients and linear internal damping. We prove global existence and exponential decay of solution. The result is achieved by considering energy like - Lyapunov functionals and suitable unique continuation theorem for the wave equation.
17
artículo
In this paper we consider the nonlinear transmission problem for the wave equation with time dependent coefficients and linear internal damping. We prove global existence and exponential decay of solution. The result is achieved by considering energy like - Lyapunov functionals and suitable unique continuation theorem for the wave equation.
18
artículo
Currently, streaming music services have become one of the main means of music consumption around the world. Spotify offers music streaming services and covers more than thirty million songs. Every year there is an increase in the production of songs so it is more difficult for a song to establish itself as a hit in the market. The objective of this work was to apply the Linear Regression modeling technique to find a trend of the data set on the popularity index of songs on the Spotify platform, in this way predict a result with new data that enters. A quantitative methodology was applied based on measurable data that were taken as datasets. As a result, a mean square error of 94.79 and a variance of 0.20 were obtained. The conclusion of the work is that the dataset used was not the ideal according to our objective.
19
artículo
This project aims to develop a performance evaluation model that serves as an application guide for companies with both linear and matrix structures. The project will primarily be conducted in three stages. The initial stage involves an analysis of organizational structures and an examination of various performance evaluation models and frameworks. Subsequently, in the second stage of the project, based on the findings from the analysis stage, the model proposal will be developed. Finally, in the third stage, validation will be carried out with experts to assess the feasibility of the proposal.
20
tesis de grado
Publicado 2023
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This study aims to design a piece of distillation equipment, with greater efficiency and extraction capacity. Currently, there are steam distillation machines, most of these equipment has the capacity to distill between 1 to 100 kilograms of material. In the present design, a linear vapor trace distillation is applied, with a capacity to distill 200 kilograms of schinus "molle"; on the other hand, the equipment will have connection to a mobile phone through Arduino, from which it will be possible to make emergency stops. This research was obtained through calculations showing that 1.89 liters of essential oil can be extracted from every 200 kilograms of molle. Finally, it is concluded that the current still is theoretically more efficient, extracting much more oil than the other still. Also, it has the capacity to distill all those roots, stems, leaves, flowers, and seeds that have an es...
