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San Jose del Torreon, Mexico

De La Fuente Salas I.M.,Technological Institute of La Laguna | Sudhakar Y.N.,Manipal University India | Selvakumar M.,Manipal University India
Applied Surface Science | Year: 2014

In this work we have deposited multlilayer films of polypyrrole (PPy) by galvanostatic method with three different dopants namely p-toluenesulphonic acid, benzene sulphonic acid, and sulfuric acid ions on graphene oxide (GO) layer. The better deposition of PPy films on GO is addressed by studying the influence of different electrolytes, concentrations and current densities. The multilayer films of GO/PPy exhibits greater capacitance compared to GO/PPy single layer. The morphology of the graphene oxide (GO)/multilayer nano PPy structures is carefully analyzed by scanning electron microscopy, FTIR and XPS spectrum. Specific capacitance of fabricated supercapacitor using multilayer electrodes is as high as 332 F g-1 at 10 mV s-1 and also compared with another supercapacitor made from single GO/PPy layer whose capacitance is 215 F g-1. Galvanostatic charge-discharge studies show good performance and stability. © 2014 Elsevier B.V. All rights reserved. Source

Uribe D.,Technological Institute of La Laguna
Proceedings - 9th International Conference on Machine Learning and Applications, ICMLA 2010 | Year: 2010

In this paper we analyse one of the most challenging problems in natural language processing: domain adaptation in sentiment classification. In particular, we look for generic features by making use of linguistic patterns as an alternative to the commonly feature vectors based on n-grams. The experimentation conducted shows how sentiment classification is highly sensitive to the domain from which the training data are extracted. However, the results of the experimentation also show how a model constructed around linguistic patterns is a plausible alternative for sentiment classification over some domains. © 2010 IEEE. Source

Moreno-Valenzuela J.,National Polytechnic Institute of Mexico | Santibanez V.,Technological Institute of La Laguna
Asian Journal of Control | Year: 2013

It is well known that many industrial manipulators use an embedded linear proportional-integral (PI) joint velocity controller to guarantee motion control through proper velocity commands. However, although this control scheme has been very successful in practice, not much attention has been paid to designing new PI velocity control structures. The problem of analyzing a saturated PI velocity joint velocity controller is addressed in this paper. By using the theory of singularly perturbed systems, the closed-loop system is studied. The robot dynamics assumed in this paper take into account bounded time-varying disturbances which may include the friction at the joints. An experimental study in a planar two degrees-of-freedom direct-drive robot is also presented, confirming the advantage of the new saturated PI joint velocity controller. © 2012 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society. Source

Uribe D.,Technological Institute of La Laguna
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

In recent years there has been an increasing interest in techniques for dealing with the compositionality of meaning. In fact, to derive the meaning of complex expressions (i.e. phrases and sentences) from the meanings of their parts has grabbed the researchers’ attention. In this paper, we examine semantic composition from the perspective of sentiment composition: if the meaning of a sentence is a function of the meanings of its parts, the polarity of a sentence is a function of the polarities of its parts. Basically, we propose a model based on sentential sentiment composition in order to categorise a text review (i.e. an opinion) according to the polarity of the sentences it contains. The experimental results showed that our approach is a plausible alternative to categorise subjective texts. © Springer International Publishing Switzerland 2016. Source

Carrillo L.R.G.,CINVESTAV | Dzul A.,Technological Institute of La Laguna | Lozano R.,CINVESTAV
IEEE Transactions on Aerospace and Electronic Systems | Year: 2012

This article presents a comparison of three control techniques: nested saturations, backstepping, and sliding modes. The control objective consists of obtaining the best control strategy to stabilize the position of a quad-rotor unmanned aerial vehicle (UAV) when using visual feedback. We propose a vision-based method to measure translational speed as well as the UAV 3D position in a local frame. The three selected controllers were implemented and tested in real-time experiments. The obtained results demonstrate the performance of such methodologies applied to the quad-rotor system. © 1965-2011 IEEE. Source

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