Polytechnic University of Aguascalientes

www.upa.edu.mx
La Isla Km 10, Mexico
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Ramirez-Delreal T.A.,University of Guadalajara | Ramirez-Delreal T.A.,Polytechnic University of Aguascalientes | Mora-Gonzalez M.,University of Guadalajara | Casillas-Rodriguez F.J.,University of Guadalajara | And 2 more authors.
Optics Express | Year: 2017

Phase-shifting is one of the most useful methods of phase recovery in digital interferometry in the estimation of small displacements, but miscalibration errors of the phase shifters are very common. In practice, the main problem associated with such errors is related to the response of the phase shifter devices, since they are dependent on mechanical and/or electrical parts. In this work, a novel technique to detect and measure calibration errors in phase-shifting interferometry, when an unexpected phase shift arises, is proposed. The described method uses the Radon transform, first as an automatic-calibrating technique, and then as a profile measuring procedure when analyzing a specific zone of an interferogram. After, once maximum and minimum value parameters have been registered, these can be used to measure calibration errors. Synthetic and real interferograms are included in the testing, which has thrown good approximations for both cases, notwithstanding the interferogram fringe distribution or its phase-shifting steps. Tests have shown that this algorithm is able to measure the deviations of the steps in phase-shifting interferometry. The developed algorithm can also be used as an alternative in the calibration of phase shifter devices. © 2017 Optical Society of America.


Santiesteban-Cos R.,Tecnologico Nacional de Mexico | Garate-Garcia A.,Polytechnic University of Aguascalientes | Montano-Godinez O.,2J Antennas United States Corporation
International Journal of Control, Automation and Systems | Year: 2017

A family of continuous state feedback synthesis based on sliding mode control is analyzed using a Lyapunov approach, such that the compensation of growing perturbations together with state variables is shown. Robustness properties of a family of controllers, varying from the well known twisting sliding mode control law to the PD controller, are studied. A non-smooth Lyapunov function is proposed such that global finite-time stability of the origin is demonstrated and tuning rules for the control gains are obtained. Moreover, since the Lyapunov function is strict, an upper bound for the convergence time of the closed loop system can be estimated, in spite of the growing perturbations with respect to the state. To illustrate the performance and robustness properties of the feedback synthesis, experimental results are presented, using a one-link pendulum as a test bed. © 2017 Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers and Springer-Verlag Berlin Heidelberg


Munoz Arteaga J.,Autonomous University of Aguascalientes | Guzman Mendoza J.E.,Polytechnic University of Aguascalientes | Alvarez Rodriguez F.J.,Autonomous University of Aguascalientes | Salgado R.S.,CENIDET
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

The differences in terms of access and ICT skills between different groups in society have created a problem of digital divide. To overcome this problem, informal learning models and strategies are required to achieve a greater impact on the population and that population can develop skills that enhance inclusion in the society knowledge. This work proposes the design of a digital literacy informal environment that aims to set a new educational paradigm approach to encourage different learning communities to uses new ICT that allows them to be more competitive in today’s world and thus shorten the digital divide. Finally, a case study is presented. The case study was implemented in the Aguascalientes State, Mexico, in a learning community composed by librarians. © Springer International Publishing AG 2017.


Margain L.,Polytechnic University of Aguascalientes | Cruz E.,Instituto Tecnologico Superior Of Naranjos | Ochoa A.,Maestria en Computo Aplicado | Hernandez A.,Autonomous University of the State of Morelos | Landeros J.R.,Polytechnic University of Aguascalientes
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

Metallic and nonmetallic minerals produced by the State of Puebla, for convenience, can be transported in containers by train to a seaport cargo exported to other countries; for transporting minerals by railways, it must analyze what the most optimal route to bring the product, taking into account various factors involved through each route in order to get a greater benefit for the transportation of minerals by train. This article comparing two metaheuristic algorithms applied to Capacitated Vehicle Routing Problem (CVRP), in order to determine which algorithm gives better optimization solutions that help you make the best route for the transfer. As a final result the implementation of an optimization algorithm Ant Colony was more successful in the runtime that on Genetic Algorithm; because it is slow to find an optimal solution among all generations. © Springer International Publishing AG 2017.


Gutierrez-Garcia R.A.,La Salle University at Bajío | Gutierrez-Garcia R.A.,Polytechnic University of Aguascalientes | Benjet C.,National Institute Of Psychiatry Ramon Of La Fuente Muniz | Borges G.,National Institute Of Psychiatry Ramon Of La Fuente Muniz | And 2 more authors.
European Child and Adolescent Psychiatry | Year: 2017

The purpose is to examine the socio-demographic and mental health outcomes in early adulthood of those who as adolescents were not in education, employment or training, termed NEET, compared to their counterparts who studied, worked, or both. One thousand and seventy-one youth residing in Mexico City participated in a representative, prospective, longitudinal 8-year two-Wave cohort study. At Wave I the participants were aged 12–17 and at Wave II aged 19 and 26. The Composite International Diagnostic Interview assessed psychiatric disorders, substance use and abuse, suicidal behavior, interpersonal relationships, employment and education. The main finding of this study is that being NEET in adolescence was associated with several socio-demographic and mental health outcomes in early adulthood, above and beyond baseline socioeconomic disadvantage and mental health compared to their peers, particularly their peers who studied only or studied and worked. NEET youth were not that different from their peers who worked exclusively highlighting the protective value of keeping youth in school. The strongest differences between NEET youth and all their peer groups were their increased risks of incident suicidal behaviors. Social policies are needed for creating more educational opportunities, greater support for retention of students, and programs to facilitate the transition from school to the labor market considering cultural attitudes towards life trajectory expectations. © 2017 Springer-Verlag Berlin Heidelberg


Garcia-Rodriguez D.E.,Polytechnic University of Aguascalientes | Mendoza-Huizar L.H.,Autonomous University of the State of Hidalgo | Diaz C.,Autonomous University of Madrid
Applied Surface Science | Year: 2017

Metal nanoparticles adsorbed on graphene are systems of interest for processes relative to catalytic reactions and alternative energy production. Graphene decorated with Cu-nanoparticles, in particular, could be a good alternative material for electrodes in direct borohydride fuel cells. However our knowledge of this system is still very limited. Based on density functional theory, we have analyzed the interaction of Cun nanoparticles (n = 4, 5, 6, 7, 13) with pristine and defective-graphene. We have considered two types of defects, a single vacancy (SV), and an extended lineal structural defect (ELSD), formed by heptagon-pentagon pairs. Our analysis has revealed the covalent character of the Cun-graphene interaction for pristine- and ELSD-graphene, and a more ionic-like interaction for SV-graphene. Furthermore, our analysis shows that the interaction between the nanoparticles and the graphene is rather local, i.e., only the nanoparticle atoms close to the contact region are involved in the interaction, being the electronic contact region much higher for defective-graphene than for pristine-graphene. Thus, the higher the particle the lower its average electronic and structural distortion. © 2017 Elsevier B.V.


Padilla T.,Polytechnic University of Aguascalientes | Ochoa A.,Autonomous University of Ciudad Juárez | Margain L.,Polytechnic University of Aguascalientes
Advances in Intelligent Systems and Computing | Year: 2016

Serious games have become a motivational engine to get knowledge, skills and fun at the same time. First of all, the player has to feel that he is playing a game where the learning is only a consequence of the playing actions and it is essential to use reliable sources of information to design them in order to obtain the desired results. Tourette syndrome is a neurological disorder poorly understood by society. Through a game is possible to get people’s attention and influence them about the negative effects produced by lack of comprehension, especially in scholar environments. In this paper, we propose the design and development of a serious game as learning tool and generator of interest about Tourette syndrome in a web-based environment. Furthermore, we analyzed the influence of stress level in the appearance of each symptom and we represented how each of them affects the player performance. It serves as an analogy of how patients feel in a social circle as a classroom, when people do not understand the disease implications. © Springer International Publishing Switzerland 2016.


Reyes-Rodriguez J.L.,CINVESTAV | Sathish-Kumar K.,Polytechnic University of Aguascalientes | Solorza-Feria O.,CINVESTAV
International Journal of Hydrogen Energy | Year: 2015

This study investigates the synthesis and characterization of a carbon derived by a simple combustion process of natural camphor. Resulted carbon was subjected to a chemical (HNO3 and KOH) and physical treatment (thermal treatment -TT, liquid Nitrogen treatment - LN2) for surface functionalization. Synthesized carbon materials were used as Pt catalyst support for the oxygen reduction reaction (ORR) in acid media. Physicochemical characterization of the carbon support was performed by multiple techniques such as, SEM, EDAX, FTIR, and Raman spectroscopy. Results conducted to spherical particles of camphor carbon (CC) with 50-60nm in size. The chemical composition revealed a CC without sulfur content. This could be an advantage for avoiding the sulfur poisoning on the Pt surface. FTIR results shows that the oxidative chemical treatment (HNO3 and KOH) incorporate functional group of CO to CC. However, the TT eliminates the functional surface group on the CC. Apparently CC and CC-LN2 samples have the same behaviour, consequently it can be inferred that the cryogenic treatment with liquid nitrogen does not significantly modify the functional chemistry of carbon surface. Raman spectroscopy reveals the disorder in the CC (ID/IG=1.01) which is lesser than the Vulcan Carbon (ID/IG=1.16) defect. Furthermore, the chemically treated CC and LN2 shows fewer defects than the thermally treated CC. Electrochemical results show that materials with enhanced specific catalytic activity toward the ORR follow the tendency: Pt/CC-KOH>Pt/CC-TT>Pt/CC>Pt/CC-LN2>Pt/Vulcan>Pt/C Etek>Pt/CC-HNO3. Our finding results open a new avenue for carbon from natural source as an effective ORR catalyst support. © 2015 Hydrogen Energy Publications, LLC.


Ortega H.S.,Polytechnic University of Aguascalientes | Ramirez J.L.G.,Polytechnic University of Aguascalientes
IIE Annual Conference and Expo 2014 | Year: 2014

This paper shows how it is possible to add value by using some statistical tools in a process. In this case, it is analyzed the first stage of the value chain in the students' learning process. The first stage is the selection of the students from senior high schools who are willing to study Industrial Engineering. The Universidad Politecnica de Aguascalientes (UPA) requires, as a selection criterion, the average obtained in the senior high school level. However, there is an empirical perception that these averages may not represent the same academic performance; i.e. the rigor in academic terms could be different from school to school though they might be reporting the same average. Therefore, it is presented an analysis of means, standard deviations and quartiles in order to assure the academic performance and to level the pre-university students' average. This analysis was conducted by using the following factors: the average and standard deviation obtained by the last generation in an in-situ preceding course and a national assessment score of pre-university skills, both of them grouped by school. At the end, it was generated a ranking number for decision-making in the selection process.


Castaneda U.Y.Z.,Polytechnic University of Aguascalientes | Ortega H.S.,Polytechnic University of Aguascalientes
IIE Annual Conference and Expo 2014 | Year: 2014

This paper describes a simulation model for improving the manufacturing process of a kitchens and closets manufacturer. Maxiequipos is a small company located in Aguascalientes, Mexico, with more than 20 years of experience in manufacturing and designing kitchens and closets. It offers consulting, installation and maintenance services to its customers as well. After performing a diagnostic to Maxiequipos's manufacturing process, it was found problems on time of delivering and stock inventory, both affect directly to the company reputation which is linked to its profits. It was observed a lack of production control and quality systems, therefore a low correlation between the supply and the demand is also present. For these issues it was proposed to apply a discrete events simulation model as a decision-making tool. By running this simulation it is ensured a minimum investment and substantial savings in time implementation. The result of this work is a structured simulation model which generates different scenarios for improving the manufacturing process of this local company.

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