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Search Results: 1 - 10 of 208946 matches for " Pedraza López "
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Efecto casimir en anti de Sitter 1 + 1
López, L.A.;Pedraza, O;
Revista mexicana de física E , 2011,
Abstract: in this paper we study the effects of curvature on the casimir force, we consider an anti de sitter background in two dimensions. we use the green's approaching and we show clearly how the method is carried out. the result obtained agrees with the plane case in the limit in which the anti de sitter radius is small, so we can see the corrections due to the curvature of the casimir force.
Efecto casimir en anti de Sitter 1 + 1
L.A. López,O. Pedraza
Revista mexicana de física , 2011,
Abstract: En el presente trabajo se estudian los efectos de la curvatura en la fuerza de Casimir, considerando un fondo anti de Sitter en dos dimensiones. Empleando el tratamiento de la función de Green, se muestra de forma clara cómo se lleva a cabo dicho método. El resultado obtenido concuerda con el caso plano en el límite en el cual el radio de anti de Sitter es peque o. De esta forma se pueden observar las correcciones debido a la curvatura en la fuerza de Casimir.
Efecto casimir en anti de Sitter 1 + 1
L.A. López,O Pedraza
Revista mexicana de física E , 2011,
Abstract: En el presente trabajo se estudian los efectos de la curvatura en la fuerza de Casimir, considerando un fondo anti de Sitter en dos dimensiones. Empleando el tratamiento de la función de Green, se muestra de forma clara como se lleva a cabo dicho método. El resultado obtenido concuerda con el caso plano en el límite en el cual el radio de anti de Sitter es peque o. De esta forma se pueden observar las correcciones debido a la curvatura en la fuerza de Casimir. In this paper we study the effects of curvature on the Casimir force, we consider an Anti de Sitter background in two dimensions. We use the Green's approaching and we show clearly how the method is carried out. The result obtained agrees with the plane case in the limit in which the Anti de Sitter radius is small, so we can see the corrections due to the curvature of the Casimir force.
Brecha Digital por Estatus Socio-Económico en la Localidad de Ciudad Bolívar de Bogotá (Colombia)
Pedraza,Luis F; López,Danilo A; Salcedo,Octavio J;
Información tecnológica , 2012, DOI: 10.4067/S0718-07642012000600008
Abstract: in this paper the analysis of the impact of information and communication technology (ict) especially for the internet service in the area of ciudad bolivar in bogota-colombia, one of the sectors with the highest poverty rates in the city. the main objective of the study is to gather relevant information to identify the characteristics of the area in terms of technology and basic needs that can be supplied or improved through ict. to properly characterize the needs of the population, three kinds of surveys were done: household, environment and enterprise. then, the statistical results of this study are presented, taking into account the permissible error and the estimated confidence level.
Dispositivo tecnológico para la optimización del tiempo de aprendizaje del lenguaje Braille en personas invidentes
Hernández,Cesar; Pedraza,Luis F.; López,Danilo;
Revista de Salud Pública , 2011, DOI: 10.1590/S0124-00642011000500015
Abstract: objective this project was aimed at designing and putting an electronic prototype into practice for improving the initial time taken by visually handicapped people for learning braille, especially children. methods this project was mainly based on a prototype digital electronic device which identifies and translates material written by a user in braille by a voice synthesis system, producing artificial words to determine whether a handicapped person's writing in braille has been correct. a global system for mobile communications (gsm) module was also incorporated into the device which allowed it to send text messages, thereby involving innovation in the field of articles for aiding visually handicapped people. results this project's main result was an easily accessed and understandable prototype device which improved visually handicapped people's initial learning of braille. conclusions the time taken for visually handicapped people to learn braille became significantly reduced whilst their interest increased, as did their concentration time regarding such learning.
Evaluación del tiempo de recuperación de fallas para LSP L1VPN sobre redes GMPLS
Salcedo,Octavio; López,Danilo; Pedraza,Luis F;
Tecnura , 2012,
Abstract: nowadays network failure is a common problem that is caused, to certain extent, by various factors such as the number of devices involved in a link, the quality of these devices, their geographical location, and environmental conditions among others. there is a great deal of factors influencing network failure occurrence, which indicates that, whether expected or not, failure will always be present. however, the issue is not about having or avoiding failure but about how quickly can a network recover and restore its services. the present paper addresses the point of failure-recovery time of an l1vpn over gmpls technology, where failure can be automatically overcome through routing protocols by redirecting packets to alternate routes.
Enrutamiento basado en el algoritmo de Dijkstra para una red de radio cognitiva
Pedraza,Luis F; López,Danilo; Salcedo,Octavio;
Tecnura , 2011,
Abstract: this paper presents the results of the evaluation of a routing protocol for cognitive radio network, based on dijkstra's algorithm, in which nodes seek the most optimal way, depending on the implements the protocol; the traffic is generated weights of each path or link. for development, and simulates the mobility of the nodes of the netwe used network simulator 2 (ns2). this tool work of cognitive radio.
Simulación y análisis de desempe?o de protocolos unicast para Redes VANET
Jiménez Pinto,Gonzalo; López,Danilo; Pedraza,Luis F;
Tecnura , 2012,
Abstract: the constant changes in network topology vanet (vehicular ad-hoc networks), the moving speed of nodes, among other problems, generate technological challenges in the routing of these networks, which has led to the implementation of different protocols. the study and analysis of the characteristics and performance of the protocols commonly used by vanets, allows the formulation of possible solutions to these challenges. to do this requires the use of tools such as simulators for networks. this paper presents a definition of vanets and their characteristics, classification and description of some commonly used protocols for this and an investigation is conducted by simulating the behavior of a network, to finally present the analysis of results and conclusions the behavior of protocols aodv, dsr and dsdv are chosen these as the most commonly used for performance.
MPLS y ATM como tecnologías backbone para la transferencia de videoconferencia
López Sarmiento,Danilo; Pedraza,Luis F; Hernández,Cesar;
Tecnura , 2012,
Abstract: this article presents the results obtained by modeling the performance of a core ip/atm network compared to a crldp/ip/mpls network when carrying delay sensitive traffic (videoconferencing) with minimum resource reservation guarantees and optimal interaction between user and applications. in order conduct the experiments, opnet-modeler simulation software (educational version) was used, which encouraged alternative implementation features that help decide which of the two technologies represents a suitable solution for current networking problems, where large volumes of information need to be transmitted and the qos offered to average users is pretty poor.
CR-LDP como protocolo de se?alización en redes de conmutación de etiquetas multiprotocol
López,Danilo; Hernández,César; Pedraza,Luis;
Revista Facultad de Ingeniería Universidad de Antioquia , 2011,
Abstract: this paper reports raised events and results from the use of cr-ldp as a possible protocol of signal point mpls, in order determine whether qos warranties the desired quality for intensive bandwidth applications.
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