Sistemas y Telemática

URI permanente para esta comunidadhttp://hdl.handle.net/10906/165

Publicación de la Facultad de Ingeniería con el objetivo de servir de órgano de difusión de resultados de investigaciones, experiencias de aplicaciones, y reflexiones que, en general, los profesores, investigadores y profesionales del país desarrollen en torno a las áreas de Ingeniería de Sistemas, Telemática y afines.

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Mostrando 1 - 20 de 293

3D reconstruction system for semi-automatic estimation of objects length and area by means of stereo vision
(2017-01-01) García, Bryan; Erazo, Jorge Humberto; FerrinB., Carlos Diego
It is mandatory to characterize dimensionally the manufactured industrial pieces for quality control purposes. As it is not possible to touch some pieces when trying to retrieve dimensional information, then non-invasive techniques are required to do so. Stereo vision is a passive technology which is both robust and accurate for non-invasive applications. For this reason, in this work we describe the design and implementation of a 3D reconstruction system for the estimation of the length and area of certain objects. This tool allows to easily incorporate new image correspondence techniques to its main execution pipeline. We carry some experiments and show certain benefits when selecting an accurate image correspondence technique for the estimation of the length and area.
A guide to best practices for the transition from ipv4 to ipv6
(Universidad Icesi., 2015-10-01) Roa G., Mario Alejandro
Este artículo presenta una propuesta de guía de buenas prácticas para asistir a las áreas de Tecnología de la In-formación [TI] en los procesos de planeación e implementación de la transición de sus servicios de infraestructura y tecnología hacia el protocolo IPv6. Se realizó un análisis de referencias para la identificación del problema y un exhaustivo estudio del estado del arte, particularmente se puntualizó en el estado actual del avance en la migración hacia IPv6 y su implementación a nivel global, en el estado actual de la tecnología en las regiones donde este protocolo es un factor clave y en el proceso que esas regiones han desarrollado para la materialización de la transición. Tam-bién se presentan los resultados del análisis de los métodos lleva-dos a cabo por los gobiernos para materializar dicha transición, la identificación de cómo los procesos del modelo de buenas prácticas para TI de ITIL® pueden soportar esta transición y los mecanismos existentes de transición tecnológica de IPv4 a IPv6 bajo dos escenarios: con y sin coexistencia de ambos protocolos.
A model of multilayer tiered architecture for big data
(2016-04-01) Lemus, Alba Consuelo Nieto; Salinas, Sonia Ordóñez
Debido a la necesidad del análisis para los nuevos tipos de datos no estructurados, repetitivos y no repetitivos, surge Big Data . Aunque el tema ha sido extensamente difundido, no hay disponible una arquitectura de referencia para sistemas Big Data que incorpore el tratamiento de grandes volúmenes de datos en bruto, agregados y no agregados ni propuestas completas para manejar el ciclo de vida de los datos o una terminología estandarizada en ésta área, menos una metodología que soporte el diseño y desarrollo de dicha arquitectura. Solo hay arquitecturas de pequeña escala, de tipo industrial, orientadas al producto, que se reducen al alcance de la solución de una compañía o grupo de compañías, que se enfocan en la tecnología, pero omiten el punto de vista funcional. El artículo explora los requerimientos para la formulación de un modelo arquitectural que soporte la analítica y la gestión de datos estructurados y no estructurados, repetitivos y no repetitivos, y contempla algunas propuestas arquitecturales de tipo industrial o tecnológicas, para al final proponer un modelo lógico de arquitectura multicapas escalonado , que pretende dar respuesta a los requerimientos que cubran, tanto a Data Warehouse , como a Big Data .
A review of the impact on XP methodology of business model inclusion in requirements elicitation
(Universidad Icesi, 2015-04-01) Cobos, Carlos; Escobar Villada, Andrés Felipe; Velandia Vanegas, Diana Lorena; Ordoñez E., Hugo Armando
XP (eXtreme Programming) agile methodology uses the User Stories as a requirements elicitation strategy. The user stories are based on natural language, which may cause some misunderstanding and miscomprehension problems between software development team and stakeholders. The paper proposes the inclusion of Business Process Models (BPN) in the XP methodology as an alternative to user stories, seeking to improve the quality and quantity of the information collected. The proposal was evaluated using user stories vs. BPN in 11 projects during all phases proposed by XP. Both strategies –and their effectiveness– were analyzed through software metrics, in order to demonstrate the improvement in the development process. By applying software metrics, it was shown that the use of BPN: improves communication between analysts and others involved, increase approval rate of customer requirements, shortens delivery requirement, fewer changes are made in each iteration and a lower percentage of defects are found by the stakeholder, regarding the use of user stories.
Acceso al crédito y límites del crecimiento en Pymes: una mirada a través de la dinámica de sistemas
(Universidad Icesi, 2010-03-24T23:16:27Z) Arenas Guerrero, Fernando Antonio
El acceso al crédito se considera como uno de los mayores problemas que deben afrontar las Pymes para su supervivencia y crecimiento. Este documento describe un modelo de dinámica de sistemas basado en el caso de una empresa manufacturera de tamaño mediano localizada en Colombia. El modelo integra aspectos operativos y financieros de la empresa e incluye variables asociadas con el crédito comercial y el crédito bancario. Se realizó un análisis de sensibilidad sobre el modelo con el fin de encontrar variables con un alto nivel de apalancamiento sobre los resultados deseados. Dichos resultados indican que las políticas operativas y financieras, cuando se aplican de manera aislada, no son suficientes para resolver los problemas de estancamiento de la empresa. Una combinación apropiada de acceso a crédito, condiciones de crédito, y políticas operativas y financieras adecuadas, parece ser la manera más conveniente para manejar la complejidad inherente a la supervivencia y crecimiento de las Pymes.
Agrupamiento mediante Q-análisis
(Universidad Icesi, 2010-11-25T22:17:31Z) Múnera Salazar, Luis Eduardo
This article presents a novel clustering algorithm, based upon topology concepts and Q-analysis. The algorithm allows to create a structural clustering, which does not depend on the knowledge of similarity measures, distances, etc. The clustering is directed in a natural fashion by the internal topology of the network/ graph. Such topology becomes evident by applying Q-analysis, by means of the structure vector, which shows the network’s internal Q-connectivity.
Algoritmos de planificación en redes de paquetes
(Universidad Icesi, 2010-03-24T23:27:25Z) Cuéllar Quiñonez, Juan Carlos
This article presents the mechanisms and processes required in order for a router to provide QoS in packet networks and it presents the state of the art in the subject of scheduling algorithms use in this kind of networks.
Alineamiento de múltiples secuencias de aminoácidos usando algoritmos genéticos
(Universidad Icesi, 2006-10-11) Solanilla, Luis Felipe
This article describes a genetic algorithm and its implementation that it allows the alignment of multiple sequences of amino acids by means of relocations that simulate the gaps insertion (holes) and actions of recombination to obtain higher scores in the alignment. Such scores are obtained by means of the method of the sum of even, in which there are considered all the possible combinations of amino acids in each column of the alignment and they are qualified being based on the punctuations of the matrix BLOSUM62.
Ambiente software de entrenamiento de redes neuronales con ajuste evolutivo de la topología y las funciones de activación
(Universidad Icesi, 2009-08-18T21:03:41Z) Méndez Ortiz, Edgar; Mariño, Juan Sebastián; Arguello Fuentes, Henry
This research examines two problems in the optimization in the neural networks used for most real applications: first, architectural design that involves determining the number of layers and neurons by layer, and second, the activation functions that will be should use in each of these layers. For it is developed a software tool based on genetic algorithms to find these parameters of a neural network. The developed tool allows the user to choose the algorithm used for training and also apply techniques to achieve better generalization such as the early stopping, the repetition of training and adjusting the training data to the activation functions used. Finally, the developed tool is tested into a specialized group of users who use the tool to find an optimal neural network architecture to solve a problem of identity verification through the facial image using artificial neural networks.
Análisis de configuraciones en el núcleo de una red NGN para garantizar QoS
(Universidad Icesi, 2010-11-25T22:04:37Z) Cuéllar Quiñonez, Juan Carlos
The quality of service has become a vital issue for service providers, but their analysis has been oriented to the configuration in the interconnectivity devices mainly. The article presents the data analysis from a series of simulations for a NGN with MPLS cores, which together are configured QoS mechanisms with specific configurations within the core network. Additionally we present the data analysis from experimental setup laboratory similar characteristics to the simulated pattern.
Análisis de interferencia entre las tecnologías inalámbricas Bluetooth e IEEE 802.11g
(Universidad Icesi, 2007-08-01) Fuertes, Miguel; Guerrero, Fabio; Cardona, Oliver
In this article an analysis of interference both in time and frequency between the wireless technologies Bluetooth 2.0 + EDR and IEEE 802.11g operating in the ISM band is presented. Also the interference between piconets Bluetooth while operating in the same range of coverage is analyzed. The most relevant aspects of the analysis, oriented to typical situations found in practice, are presented.
Análisis de irradiación electromagnética en las inmediaciones de una radio base sectorizada en condiciones andinas
(Universidad Icesi, 2006-10-11) García Ariza, Alexis Paolo
For more than a year now, the Radio GIS Research Group, assisted by the Schools of Electrical, Electronic and Telecommunications Engineering (E3T) at UIS, together with other local research groups (i.e. ICESI´s I2T, UFPS’s GIDT, and UDI’s MAXWELL, and the Colombian Ministry of Communications have been conducting a number of studies on high-frequency electromagnetic radiation under outdoor conditions to determine acceptable human exposure levels to this kind of radiation. These studies are driven not only by academic interest in this subject, but also by concerns raised by communities in the city of Bucaramanga and other regions in Colombia with respect to the installation of a large number of radiocommunications stations. With this paper, the Radio GIS group makes some contributions, which will hopefully benefit both the population in general and the regulatory agencies, aiming at establishing control policies based on concrete theoretical and technical studies. The results of the studies discussed in this paper derive from previous research conducted in the field of electromagnetic propagation
Análisis descriptivo del proceso de implementación del nivel 2 del modelo CMMI en una empresa regional de desarrollo de software
(Universidad Icesi, 2008-12-18) Picazzo M., Catherine; Villegas Machado, Norha Milena; Tamura Morimitsu, Gabriel
CMMI (Capability Maturity Model Integration) is basically a continuous- improvement inspired model to classify software development organizations according to a fivelevel maturity and capability scale. The classification in a given level is based on the dominance that an organization shows evidence to have over the areas of that level, which in turn reflects the degree of maturity of the organization and of the processes that it follows to develop software. This article presents a preliminary descriptive analysis of a level 2 implementation process of the CMMI model in a Colombian software development company, making an overall presentation of how it was brought into practice the theory of the model in the processes of the company, to be compliant with the conditions, goals and practices defined in the level 2 process areas of the model. The article also describes the problems which arose in the execution of the project, as well as how they were solved. As preliminary results are presented some of the indicators defined by the company for the software processes, and the software tools that were acquired or developed for the support of the implementation of the process areas. Finally, some conclusions and recommendations which can be found.
Análisis espectral de parámetros fisiológicos para detección de emociones
(Universidad Icesi, 2012-01-01) Valderrama Cuadros, Camilo Ernesto; Ulloa Villegas, Gonzalo Vicente
This paper show a literature review in the field of emotions detection. Show the strength of aplications of Brain Computer Interfaces (BCI) and what the functionality of it is. Explain how work with neourosignal and how to extract information using Discrete Wavelet Transform to recognize some characteristics that are present in the signal. Also explain the methods which are used for classification the signals. The purpose of the review is established a basis for the development of a project which want define the behavior of brain signal's when a person sees a commercial advertisement.
Análisis sistémico de los riesgos de servicio y financiero en la cadena de abastecimiento
(Universidad Icesi, 2013-04-01) Daza, Harold Fernando; Romo L., Felipe; Arenas Guerrero, Fernando Antonio
Based on a model developed trough system dynamics, which represents a supply chain, this paper aims to establish a systemic approach to service risk management and financial risk management, taking into account the decisions made from the operational area and its influence on the risk in different areas of the company.
Análisis, modelamiento y simulación de redes enmalladas basadas en el estándar 802.16-2004.
(Universidad Icesi, 2005-07-25) Bustamante Miller, Roberto; Hincapié Reyes, Roberto Carlos
The following article is a presentation of mesh networks based on IEEE Standard 802.16-2004. Though it provides a general description of this standard, it also includes specific characteristics of mesh networks. It also discusses technology issues associated with existing gaps found in the above mentioned standard which have not yet been resolved. It also describes typical problems of mesh networks which hinder implementation of these kinds of networks besed on this or any other standard. The last section of this paper presents information on the progress being made as the result of the joint effort of the universities involved in this project, including the conclusions that heve been drawn so far.
Analysis of coexistence and mutual interference between mobile and digital television systems
(Universidad Icesi, 2011-10-01) Guiducci, Doriana; Grazioso, Paolo; Barbiroli, Marina; Carciofi, Claudia; Riva, Guido; Guidotti, Alessandro
The ever increasing demand for multimedia wireless communication systems is a key feature of more advanced markets. The buzzwords of personal communications, meant to provide “access to anyone, anywhere, at anytime to the wanted service”, implies that radio spectrum demands are dramatically increasing in most developed markets. The last World Radiocommunication Conference (WRC-07) allocated on a co-primary basis the upper part of the UHF band to mobile services as from 2015 in Region 1, taking advantage of the Digital Dividend due to the higher spectrum efficiency of digital TV with respect to the analogue system. This will cause potentially harmful mutual interference between TV and mobile radio services, that needs to be carefully analysed. In this paper we present a study of the co-channel interference problem, proposing a methodology to take into account the mutual interference between a LTE mobile network and a DVB-T system and highlighting the different behaviour of the two radio links.
Anatomy guided bottom up creature skinning
(Universidad Icesi, 2011-07-13T22:40:32Z) Loaiza Buitrago, Diego Fernando; Navarro Newball, Andrés Adolfo; Herrera Botero, Francisco Julián
It is possible to guide skin construction from the creature’s inner anatomy. This paper introduces a method where is provided the system with bones, a set of muscles and a set of subsidiary organs in order to generate the mesh of the skin. The method generates a set of feature points from the inner anatomy. Then, it projects the feature points on a mirror plane which cuts the creature in the middle. Once in the plane, triangulate and reflect the points and adjust the skin’s mesh inflating it and deflating it until all skin vertices are within some threshold of the underlying anatomy. Finally, fur is generated with offsets calculated from the skin’s mesh. Feature point generation and automatic mesh generation strongly rely on the anatomical knowledge provided to the algorithm. However, it eliminates the need of a preexisting skin mesh. The resulting mesh is consistent with the underlying anatomy.
Antidefacement
(Universidad Icesi, 2016-10-01) Quintero, José Luis Osorio; Urcuqui, Christian Camilo; Peña, Melisa García; Cadavid, Andrés Navarro
Internet conecta alrededor de tres mil millones de usuarios en todo el mundo, número que sigue en aumento con el transcurrir de los días. Gracias a esta tecnología, las personas, las compañías y los dispositivos pueden realizar distintas tareas, como por ejemplo difundir información a través de los sitios Web. Debido a los grandes volúmenes de información sensible y al desconocimiento de la seguridad en las páginas Web, el número de ataques a estas aplicaciones ha aumentado significativamente.
Aplicación de herramientas de pensamiento sistémico para el aprendizaje de Lean Manufacturing
(Universidad Icesi, 2010-03-24T23:30:08Z) Rivera Cadavid, Leonardo; Dinas, Johan Armando; Franco Caicedo, Paula
Lean Manufacturing seeks to eradicate waste. This pursuit is conducted changing many pre-conceptions inherited from the mass production traditions. It is necessary to understand immediate and delayed impacts of the changes, as well as direct and indirect results of these changes. This systemic approach should enhance the learner’s understanding of the system (the manufacturing company), its variables, its outcomes, and the relationships among the system’s components. This paper presents the process of designing a course to teach Lean Manufacturing to working professionals using systems thinking. This design process is conducted for the development of job competencies and using Active Learning Strategies.

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