| Records |
| Author |
Ortiz J.; Londono J.; Novillo F.; Ampuno A.; Chávez M. |
| Title |
Determinación de Invariantes en Grandes Centros de Datos basados en Topología Fat-Tree |
Type |
Journal Article |
| Year |
2015 |
Publication |
Revista Politécnica |
Abbreviated Journal |
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Volume  |
Vol. 35 |
Issue |
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Pages |
pp. 91-96 |
| Keywords |
Invariantes de red, topologías, Fat-tree, simulación, emulación |
| Abstract |
Durante los últimos años ha existido un fuerte incremento en el acceso a internet, causando que los centros de datos ( DC) deban adaptar dinámicamente su infraestructura de red de cara a enfrentar posibles problemas de congestión, la cual no siempre se da de forma oportuna. Ante esto, nuevas topologías de red se han propuesto en los últimos años, como una forma de brindar mejores condiciones para el manejo de tráfico interno, sin embargo es común que para el estudio de estas mejoras, se necesite recrear el comportamiento de un verdadero DC en modelos de simulación/emulación. Por lo tanto se vuelve esencial validar dichos modelos, de cara a obtener resultados coherentes con la realidad. Esta validación es posible por medio de la identificación de ciertas propiedades que se deducen a partir de las variables y los parámetros que describen la red, y que se mantienen en las topologías de los DC para diversos escenarios y/o configuraciones. Estas propiedades, conocidas como invariantes, son una expresión del funcionamiento de la red en ambientes reales, como por ejemplo la ruta más larga entre dos nodos o el número de enlaces mínimo que deben fallar antes de una pérdida de conectividad en alguno de los nodos de la red. En el presente trabajo se realiza la identificación, formulación y comprobación de dos invariantes para la topología Fat-Tree, utilizando como software emulador a mininet. Las conclusiones muestran resultados concordantes entre lo analítico y lo práctico. |
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| Publisher |
Escuela Politécnica Nacional |
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| Language |
Español |
Summary Language |
Español |
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Approved |
no |
| Call Number |
cidis @ cidis @ |
Serial |
32 |
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| Author |
Dennys Paillacho; F. Novillo; W. Agila.; V. Huilcapi |
| Title |
Impacto de las redes de comunicaciones en los Sistemas Robóticos de Control |
Type |
Journal Article |
| Year |
2015 |
Publication |
Revista Politécnica |
Abbreviated Journal |
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| Volume |
Vol. 35 |
Issue |
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Pages |
pp. 97-102 |
| Keywords |
Ethernet, CAN, Swichted Ethernet, Sistemas de control en red, Ciclo de comunicación, Control de ajuste de trayectoria |
| Abstract |
El análisis de incidencia que tienen las redes de comunicaciones sobre el comportamiento de los sistemas robóticos de control en red muestra grandes dificultades cuando se quieren hacer evaluaciones de tipo analítico. Por tal razón, en este trabajo un análisis que utiliza una aproximación basada en simulación es propuesto, de manera que el comportamiento temporal y espacial de un sistema robótico de control en red pueda ser evaluado. Para tal efecto, se propone un entorno de validación mediante el cual una red de comunicaciones permita distribuir mensajes de control entre el controlador principal y los controladores remotos ubicados en cada articulación angular del robot manipulador planar. Las interacciones entre los componentes del sistema han sido modeladas mediante un sistema de capas. Dicho modelo es llevado a un entorno de simulación con la finalidad de analizar el impacto de distintos parámetros de comunicaciones (i.e. tipo de red, tasa de datos y tamaño de datos) sobre el ciclo de comunicación y el error de seguimiento de trayectoria en un sistema robótico. |
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| Publisher |
Escuela Politécnica Nacional |
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Español |
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Español |
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no |
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cidis @ cidis @ |
Serial |
33 |
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| Author |
Mildred Cruz; Cristhian A. Aguilera; Boris X. Vintimilla; Ricardo Toledo; Ángel D. Sappa |
| Title |
Cross-spectral image registration and fusion: an evaluation study |
Type |
Conference Article |
| Year |
2015 |
Publication |
2nd International Conference on Machine Vision and Machine Learning |
Abbreviated Journal |
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| Volume |
331 |
Issue |
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Pages |
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| Keywords |
multispectral imaging; image registration; data fusion; infrared and visible spectra |
| Abstract |
This paper presents a preliminary study on the registration and fusion of cross-spectral imaging. The objective is to evaluate the validity of widely used computer vision approaches when they are applied at different spectral bands. In particular, we are interested in merging images from the infrared (both long wave infrared: LWIR and near infrared: NIR) and visible spectrum (VS). Experimental results with different data sets are presented. |
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Thesis |
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| Publisher |
Computer Vision Center |
Place of Publication |
Barcelona, Spain |
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| Language |
English |
Summary Language |
English |
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Approved |
no |
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cidis @ cidis @ |
Serial |
35 |
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| Author |
Julien Poujol; Cristhian A. Aguilera; Etienne Danos; Boris X. Vintimilla; Ricardo Toledo; Angel D. Sappa |
| Title |
A visible-Thermal Fusion based Monocular Visual Odometry |
Type |
Conference Article |
| Year |
2015 |
Publication |
Iberian Robotics Conference (ROBOT 2015), International Conference on, Lisbon, Portugal, 2015 |
Abbreviated Journal |
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| Volume |
417 |
Issue |
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Pages |
517-528 |
| Keywords |
Monocular Visual Odometry; LWIR-RGB cross-spectral Imaging; Image Fusion |
| Abstract |
The manuscript evaluates the performance of a monocular visual odometry approach when images from different spectra are considered, both independently and fused. The objective behind this evaluation is to analyze if classical approaches can be improved when the given images, which are from different spectra, are fused and represented in new domains. The images in these new domains should have some of the following properties: i) more robust to noisy data; ii) less sensitive to changes (e.g., lighting); iii) more rich in descriptive information, among other. In particular in the current work two different image fusion strategies are considered. Firstly, images from the visible and thermal spectrum are fused using a Discrete Wavelet Transform (DWT) approach. Secondly, a monochrome threshold strategy is considered. The obtained representations are evaluated under a visual odometry framework, highlighting their advantages and disadvantages, using different urban and semi-urban scenarios. Comparisons with both monocular-visible spectrum and monocular-infrared spectrum, are also provided showing the validity of the proposed approach. |
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English |
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no |
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cidis @ cidis @ |
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44 |
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| Author |
Miguel Oliveira; Vítor Santos; Angel D. Sappa; Paulo Dias |
| Title |
Scene representations for autonomous driving: an approach based on polygonal primitives |
Type |
Conference Article |
| Year |
2015 |
Publication |
Iberian Robotics Conference (ROBOT 2015), Lisbon, Portugal, 2015 |
Abbreviated Journal |
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| Volume |
417 |
Issue |
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Pages |
503-515 |
| Keywords |
Scene reconstruction, Point cloud, Autonomous vehicles |
| Abstract |
In this paper, we present a novel methodology to compute a 3D scene representation. The algorithm uses macro scale polygonal primitives to model the scene. This means that the representation of the scene is given as a list of large scale polygons that describe the geometric structure of the environment. Results show that the approach is capable of producing accurate descriptions of the scene. In addition, the algorithm is very efficient when compared to other techniques. |
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Thesis |
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| Publisher |
Springer International Publishing Switzerland 2016 |
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| Language |
English |
Summary Language |
English |
Original Title |
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Expedition |
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Conference |
Second Iberian Robotics Conference |
| Notes |
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Approved |
no |
| Call Number |
cidis @ cidis @ |
Serial |
45 |
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