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Ítem Control multifrecuencia en tiempo real(Fondo Editorial Universidad EAFIT, 2003-12-01) VELEZ, CARLOS MARIO; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem Ideas y aplicaciones de los sistemas de control multifrecuencia(2004-06-01) VELEZ, CARLOS MARIO; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem Control Multifrecuencia en Tiempo Real Utilizando Herramientas CACSD(Universitat Politecnica de Valencia, 2004-06-01) VELEZ, CARLOS MARIO; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem Diseño y aplicación del control multifrecuencia con un esquema de muestreo irregular(Fondo Editorial Universidad EAFIT, 2004-10-01) VELEZ, CARLOS MARIO; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem Multirate control of an unmanned aerial vehicle(World Scientific and Engineering Academy and Society (WSEAS) Press, 2005-01-01) Vélez S., C.M.; Agudelo, A.; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoThe application of multirate sampling to the control of an unmanned aerial vehicle (a mini-helicopter robot) using CACSD tools, developed specially for that goal, is presented. Multirate control is tested via simulation over the Matlab/Simulink mini-helicopter model, which is briefly described. A multirate modeling method is presented, which is the base of a CACSD tool for the modeling, simulation and real-time code generation of multirate control systems - the Multirate Control Toolbox (MCT).Ítem Control and parameter estimation of a mini-helicopter robot using rapid prototyping tools(World Scientific and Engineering Academy and Society (WSEAS) Press, 2006-01-01) Vélez S., C.M.; Agudelo, A.; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoThis paper shows the control and parameter estimation of a mini-helicopter robot using a rapid prototyping environment based on Matlab/Simulink. The parameter estimation task is facilitated by the availability of a block-based visual simulation model and its integration in a general Matlab environment, with the feasibility of use of many other tools. The environment is integrated by modules which use common Matlab tools (ground control station, linearization, parameter estimation, heuristic identification) and own modules developed specifically for simulation, state estimation and multirate control. An example is presented in a software-in-the-loop context, showing all possibilities of the software environment including supervisory, estimation, linearization, and control tasks.Ítem Combining fuzzy, PID and regulation control for an autonomous mini-helicopter(ELSEVIER SCIENCE INC, 2007-05-15) Sanchez, Edgar N.; Becerra, Hector M.; Velez, Carlos M.; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoThis paper reports on the synthesis of different flight controllers for an X-Cell mini-helicopter. They are developed on the basis of the most realistic mathematical model currently available. Two hybrid intelligent control systems, combining computational intelligence methodologies with other control techniques, are investigated. For both systems, Mamdani-type fuzzy controllers determine the set points for altitude/attitude control. These fuzzy controllers are designed using a simple rule base. The first scheme consists of conventional SISO PID controllers for z-position and roll, pitch and yaw angles. In the second scheme, two of the previous PID controllers are used for roll and pitch, and a linear regulator is added to control altitude and yaw angle. These control schemes mimic the action of an expert pilot. The designed controllers are tested via simulations. It is shown that the designed controllers exhibit good performance for hover flight and control positioning at slow speed. © 2006 Elsevier Inc. All rights reserved.Publicación Metaheurísticos: una alternativa para la solución de problemas combinatorios en Administración de Operaciones(Revista EIA, 2007-12) Vélez, Mario César; Montoya, José Alejandro; Universidad EAFIT. Departamento de Ingeniería de Producción; marvelez@ eafit.edu.co; jmonto36@eafit.edu.co; Gestión de Producción y LogísticaThe scarce diffusion given to the newest techniques for solving complex operations management problems has as a direct consequence that companies lose opportunities to operate at lower costs and higher efficiency -- The objective of this article is to introduce and explain the fundamental ideas behind metaheuristics, a solution technique for combinatorial problems that has received the most attention from the academiccommunity in the last few years -- In order to illustrate these ideas, an example of a classical combinatorial problem in the sequencing of operations area is presented, and a solution algorithm making use of some of these techniques is proposedÍtem Control based on numerical methods and recursive Bayesian estimation in a continuous alcoholic fermentation process(2009-01-01) QUINTERO, OLGA LUCIA; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem Robust-control-based controller design for a mobile robot(Springer Netherlands, 2009-01-01) QUINTERO, OLGA LUCIA; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem A linear-interpolation-based controller design for trajectory tracking of mobile robots(Elsevier Ltd., 2010-01-01) QUINTERO, OLGA LUCIA; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem Transition Management for the Smooth Flight of a Small Autonomous Helicopter(SPRINGER, 2010-04-01) Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem Transition management for the smooth flight of a small autonomous helicopter(Springer Netherlands, 2010-04-01) Agudelo-Toro, Andres Y.; Velez, Carlos M.; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoThis work is centered in the definition of a transition management system for a small autonomous helicopter based on trajectory smoothing and a finite state machine (FSM). A smooth flight schedule decreases transients originated by direction changes and flight mode transitions (e.g., horizontal flight to hover mode). Although previous works have presented trajectory generation and FSM oriented controls, no previous studies have mixed these approaches in a single framework together with speed transitions. The proposed methods are validated in simulation with a realistic dynamic model of a small helicopter. © 2009 Springer Science+Business Media B.V.Publicación Benchmarking about Lean Manufacturing in the textile sector in Medellin(Journal of Economics, Finance and Administrative Science, 2010-06) Arrieta Posada, Juan Gregorio; Romano Martínez, María Jimena; Botero Herrera, Victoria Eugenia; Universidad EAFIT. Departamento de Ingeniería de Producción; jarrieta@eafit.edu.co; vboteroh@eafit.edu.co; mromanom@eafit.edu.co; Gestión de Producción y LogísticaThis document shows the results of a benchmarking study among different firms from the clothing industry that seeks to evaluate their degree of implementation in Lean Manufacturing during their respective productive processes -- The study mainly targets firms that produce blue jeans, cotton shirts and t-shirts -- Indeed, this industrial sector in the city of Medellin is highly developed and one of the most dynamic, thus the interest to perform an evaluation in this area -- To achieve the benchmarking, a questionnaire was designed and applied to the different firms that were visited -- The most significant result obtained was that Lean Manufacturing techniques were not prevalent within the general public -- Only those companies with years in the business, exporters or foreign trademarks licensees, were knowledgeable of their application and developmentPublicación The impact of supply chain decisions, using dynamic systems, of an aquatic garment manufacturing company(Revista Ingeniería Industrial, 2010-06) Peña Zapata, Gloria Elena; Pineda Toro, Mauricio; Escalante Ochoa, Daniel; Ramírez Echeverri, Sergio A.; Peña Zapata, Gloria Elena; Pineda Toro, Mauricio; Escalante Ochoa, Daniel; Ramírez Echeverri, Sergio A.; Universidad EAFIT. Departamento de Ingeniería de Producción; sramire@eafit.edu.co; Gestión de Producción y LogísticaThis article shows the supply chain model of the company Creaciones Nadar S.A. Thatmanufactures aquatic sports garments -- The chain links are the clients, the store, the warehousing, the internal and satellite plants and raw material supply -- The supply chain of Creaciones Nadar S.A. is a complex system given the different agents that form the feedback structures and delayed effects on behaviors -- The supply chain has different dynamic behaviors generated by changes in external factors such as garment’s demand, number of required workers in the company’s plant, the warehousing, and the store, among other -- A dynamic system methodology and the software Ithink® were used to model the chain; moreover, different scenarios were analyzed using simulation and taking into account the most representative variables to be modified -- The obtained results allow Creaciones Nadar S.A. to determine policies and parameters and to obtain the best kind of benefits for the companyPublicación Games and practical exercises as support to the interactive courses for the Operations and Logistics Management area in the Production Engineering Pregraduated Program of the EAFIT University(Latin American and Caribbean Journal of Engineering Education, 2010-11-16) Rodríguez, Carlos A.; Ramírez, Sergio A.; Universidad EAFIT. Departamento de Ingeniería de Producción; carodri@eafit.edu.co; sramire@eafit.edu.co; Gestión de Producción y LogísticaThe following paper introduces the way on how play different games played in the subjects studied in engineering -- These games are a complement to the theory learnt in class and also facilitate students’ learning process. The games goal is to allow the student to have more control of his/her learning process, making it necessary to develop new ways of teaching class -- Teachers and students will be able to find the tools necessary to make the games a true learning process in this paperPublicación Optimización de parámetros y de valores de inicio para el modelo de Holt basado en señales de rastreo(Revista EIA, 2010-12) Castro Zuluaga, Carlos Alberto; Uribe Cadavid, Diana Cecilia; Universidad EAFIT. Departamento de Ingeniería de Producción; ccastro@eafit.edu.co; pfdianauribe@eia.edu.co; Gestión de Producción y LogísticaTime series models are quantitative techniques commonly used to forecast the behavior of variables -- These models include the exponential smoothing with trend or Holt model that requires the definition of the smoothing constants α and β and the initialization values, both required for the model upgrade -- This paper proposes a different way to obtain the parameter values and initial conditions of the Holts model, optimizing the tracking signal range (TSR), in order to achieve a more robust model from the viewpoint of accuracy of the results and historical performance -- Some comparisons between the proposed approach and the traditional methods based on the mean absolute deviation (MAD) and the mean square error (MSE) are provided -- These are the measurestraditionally used to determine the degree of accuracy of a model, and a better model performance is obtainedÍtem arboles binomiales para la valoración de opciones sobre procesos derivados de la ecuacion diferencial estocástica autónoma(Fondo Editorial Universidad EAFIT, 2010-12-01) Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoÍtem European Call option pricing by the Adomian decomposition method(Universidad EAFIT, 2011) Rodriguez, S.; Marin, Freddy; Rodriguez, S.; Marin, Freddy; Universidad EAFIT. Escuela de Ciencias; Modelado MatemáticoAn option is a security that gives its owner the right to trade in a fixed number of shares of a specified common stock at a fixed price at any time on or before a given date. The act of making this transaction is referred to as exercising the option. The fixed price is termed the strike price, and the given date, the expiration date. A call option gives the right to buy the shares; a put option gives the right to sell the shares.Publicación Design of a didactic guide for learning in teh area of operations and logistics with the beer game in the software iThink®(Latin American and Caribbean Journal of Engineering Education, 2011) Peña, Gloria Elena; Rodríguez, Carlos A; Ramírez, Sergio; Universidad EAFIT. Departamento de Ingeniería de Producción; sramire@eafit.edu.co; carodri@eafit.edu.co; gepena@unal.edu.co; Gestión de Producción y LogísticaThe systems dynamics has charged significant importance as tool of support to the educational processes for the learning --An example is the the Beer Game, which, through the use of the software iThink®, simulates a chain of supplies, which permits the student to take decisions with regard to the behavior of the same one under certain conditions of simulation -- This work presents a didactic guide of the Play of the Beer by means of the use of the software iThink®, which has been developed as a complement in the processes of learning of the students of pregraduated level of Engineering of Production of the EAFIT University in Medellin, Colombia -- It is sought with this experience to develop a strategy that when it be played, the unique one that can create variations in the model is the player and the strategy can vary when be considered that is not throwing the results of form desired -- To be able to play should be determined the values of FAI and FLS that signify respectively; the first one is that so intense responds the inventory to the changes and the second is that weight in the quantity of inventory is found in transit for each position, With these concepts the variables are reinforced that disturb the effect whip in the supply chain