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Robles Gonzalez C.M.A.,ESIME IPN | Bucio Ramirez A.G.,UPIITA IPN | Ramirez Tachiquin M.P.,La Salle University at Cuauhtémoc | Sanchez Nava V.D.,La Salle University at Cuauhtémoc
Lecture Notes in Electrical Engineering | Year: 2014

We study the Electrical Impedance Equation within a special class of domains, whose boundaries posses non-smooth points. The forward Dirichlet boundary value problem is solved bias a novel numerical method, based upon the Pseudoanalytic Function Theory, that does not require additional regularization techniques to fulfill the boundary condition at the non-smooth points. © 2014 Springer Science+Business Media Dordrecht.

Aguilar-Ibanez C.,CIC IPN | Mendoza-Mendoza J.A.,CIC IPN | Suarez-Castanon M.S.,ESCOM IPN | Davila J.,ESIME IPN
International Journal of Control | Year: 2014

This paper presents a smooth control strategy for the regulation problem of an uncertain system, which assures uniform ultimate boundedness of the closed-loop system inside of the zero-state neighbourhood. This neighbourhood can be made arbitrarily small. To this end, a class of nonlinear proportional integral controllers or PI controllers was designed. The behaviour of this controller emulates very close a sliding mode controller. To accomplish this behaviour saturation functions were combined with traditional PI controller. The controller did not need a high-gain controller or a sliding mode controller to accomplish robustness against unmodelled persistent perturbations. The obtained closed-solution has a finite time of convergence in a small vicinity. The corresponding stability convergence analysis was done applying the traditional Lyapunov method. Numerical simulations were carried out to assess the effectiveness of the obtained controller. © 2014 © 2014 Taylor & Francis.

Moya S.,Mexican Institute of Petroleum | Escobar J.,ESIME IPN
IMA Journal of Mathematical Control and Information | Year: 2015

A typical problem in big cities is traffic congestion. An interesting problem is to study the traffic control at an intersection, which is an important aspect of the urban traffic control system. Commonly, the decision policy depends on the forecasting results on the incoming and outgoing flows at a signalized intersection. There are approaches to study this kind of problem when the roles of the roads are symmetrical at an intersection. However, there are different types of traffic problems where one road has priority on an intersection. In this paper, we present the problem of modelling signalized roads on an intersection as a finite controlled Markov chain game. Here, we try to minimize the queue in each road, at the intersection, taking into account that there is a road, known as a dominating road that can enforce his strategy, on the rest of the symmetric roads. Then, a dominant-symmetric equilibrium problem, a so-called Stackelberg-Nash equilibrium problem, is suggested with the use of a regularized equivalent version of the 'Extraproximal Method' to find a solution. Experimental results illustrate the feasibility of the proposed method. © The authors 2013. Published by Oxford University Press on behalf of the Institute of Mathematics and its Applications. All rights reserved.

Lozada-Castillo N.,UPIBI IPN | Chairez I.,UPIBI IPN | Luviano-Juarez A.,ESIME IPN | Escobar J.,ESIME IPN
Proceedings of the IEEE Conference on Decision and Control | Year: 2014

In this article, the problem of parameter identification and state estimation for synchronous motors is tackled by means of the combination of algebraic techniques, in the context of a step by step approach. The step by step procedure consists in separating the estimation problem in three subsequent steps, in such a manner that it is possible to carry out each identification (estimation) step. The first one estimates a set of electrical parameters, then a state estimation based on the algebraic derivative approach is performed. The results of the proposed algebraic techniques are used to make possible the last step, in which the mechanical parameters are estimated. Numerical results are used to illustrate the effectiveness of the proposed methodology. © 2014 IEEE.

Escobar J.,ESIME IPN | Poznyak A.,CINVESTAV
Proceedings of the 2010 11th International Workshop on Variable Structure Systems, VSS 2010 | Year: 2010

This paper deals with time problem of time-varying parameters estimation of stochastic systems under colored noise perturbations. A two step method is proposed. First, it is designed a tracking process, based in the "equivalent control" technique, providing the finite-time equivalence of the original stochastic process with unknown parameters to an auxiliary one. This equivalence does not cancel the noise effects, but allows to estimate the model in a "regression form" for a sufficient short time. In the second step, the Least Squares Method with a scalar forgetting factor is applied to estimate the time-varying parameters of the given model. Two examples illustrate the effectiveness of the proposed approach, the first shows an application in a system of location and motion, and the second an estimation of a growth rate of a population dynamic. © 2010 IEEE.

Silva Ortigoza R.,Cidetec | Marcelino-Aranda M.,UPIICSA IPN | Silva Ortigoza G.,BUAP | Hernandez Guzman V.M.,UAQ | And 4 more authors.
IEEE Latin America Transactions | Year: 2012

Robotics is a fast developing and exciting field with multiple applications which span from robot manipulators to mobile robots. This paper presents a literature review on wheeled mobile robots. We point out the main considerations to be taken into account when designing this class of robots. The main control problems are recalled as well as the corresponding solutions. Finally, we summarize the most important approaches used to render mobile robots autonomous. © 2003-2012 IEEE.

Vazquez-Fernandez E.,ESIME IPN | Coello C.A.C.,CINVESTAV
2013 IEEE Congress on Evolutionary Computation, CEC 2013 | Year: 2013

This paper employs an evolutionary algorithm to adjust the weights of the evaluation function of a chess engine. The selection mechanism of this algorithm chooses the virtual players (individuals in the population) that have the highest number of problems properly solved from a database of tactical and positional chess problems. This method has as its main advantage that we only mutate those weights involved in the solution of the current problem. Furthermore, the mutation mechanism is based on a Gaussian distribution whose standard deviation is adapted through the number of problems solved by each virtual player. We show here how, with the use of this method, we were able to increase the rating of our chess engine in 557 Elo points (from 1760 to 2317). © 2013 IEEE.

Aguilar-Ibanez C.,CIC IPN | Mendoza-Mendoza J.,CIC IPN | Davila J.,ESIME IPN
Nonlinear Dynamics | Year: 2014

This paper presents a control strategy designed as a combination of a PD controller and a twisting-like algorithm to stabilize the damped cart pole system, provided that the pendulum is initially placed within the upper-half plane. To develop the strategy, the original system is transformed into a four-order chain of integrator form, where the damping force is included through an additional nonlinear perturbation. The strategy consists of simultaneously bringing the position and velocity of the pendulum to within a compact region by applying the PD controller. Meanwhile, the system state variables are brought to the origin by the twisting-like algorithm. The corresponding convergence analysis is done using several Lyapunov functions. The control strategy is illustrated with numerical simulations. © 2014, The Author(s).

Robledo-Martinez A.,Metropolitan Autonomous University | Hernandez-Avila J.L.,Metropolitan Autonomous University | Espino F.,ESIME IPN
PPPS 2001 - Pulsed Power Plasma Science 2001 | Year: 2015

A vacuum spark develops in the metallic vapor emitted by the electrodes. The plasma thus created experiences contractions that originate plasma points or micropinches. We report here an investigation into the dynamics of these both in the vacuum spark and the exploding wire. A fast, 2 kJ generator was used for the experiments. The diagnostics employed include optical frame and streak photography, time-resolved filtered X-ray detection and pinhole X-ray photography. The results obtained indicate that there is a substantial amount of pinching, some of it producing X-radiation. The energy of the X-rays tend to be rather soft and no characteristic lines were detected, even when swapping electrodes, which are made of dissimilar material. This demonstrates that radiative collapse is not attained at this type of energy and that for this type of experiments it is irrelevant what metallic vapors initiate the vacuum arc. © 2002 IEEE.

Diaz Albarran S.F.,ESIME IPN | Elyukhin V.A.,CINVESTAV | Rodriguez Peralta P.,ESIME IPN
Physica B: Condensed Matter | Year: 2012

A thermodynamic model of self-assembling of isoelectronic impurities in ZnS:(Cd, O) is presented. Self-assembling results in an occurrence of 1O4Cd tetrahedral clusters. The self-assembling conditions are derived by the minimum condition of the free energy of ZnS:(Cd, O) for Cd and oxygen in the dilute and ultra dilute limits, respectively. The occurrence of 1O4Cd clusters and the completion of self-assembling when all oxygen atoms are in clusters are results of the continuous phase transitions. The temperature of a self-assembling occurrence does not depend on oxygen content and is a function of Cd concentration. The fulfilled estimates show that at temperature of 300 °C all oxygen atoms should be in 1O4Cd clusters if Cd content is insignificantly larger than 1%. © 2011 Elsevier B.V. All rights reserved.

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