Tecnolgico de Monterrey

Monterrey, Mexico

Tecnolgico de Monterrey

Monterrey, Mexico
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Merlo J.M.,Tecnolgico de Monterrey | Aguilar J.F.,Instituto Nacional Of Astrofsica Ptica Y Electrnica | Mart-Panameo E.,Benemerita University Autnoma Of Puebla
Review of Scientific Instruments | Year: 2011

We study the interaction distance in the lateral force detection, using a standard quartz tuning fork as a force transducer. That is the distance at which the interaction sample-probe starts to be detected. We study in particular the dependence on the approaching angle. For angles smaller than 0.366 radians, we found an exponential behavior of the interaction distance as a function of the approaching angle. We show an equation that adjusts well with the experimental data, and discuss the possible phenomena. © 2011 American Institute of Physics.

Saxena A.,Infosys | Chauhan N.S.,Infosys | Reddy S.K.,Infosys | Vangal A.S.,Infosys | Rodrguez D.P.,Tecnolgico de Monterrey
IEEE Cloud Computing for Emerging Markets, CCEM 2012 - Proceedings | Year: 2012

CAPTCHAs are popularly used techniques to distinguish humans and automated applications. Such techniques are often useful in banking transactions, email creation, online surveys, data downloads etc. Starting from a very primitive stage of providing the users with a simple alphabetical string to asking using to do complex calculations, CAPTCHAs have come a long way in terms of sophistication of human-bot distinction. However in this process, these CAPTCHAs have lost their human friendliness, either because of the noise being added to the CATPCHA tests or because of the complications of the challenges thrown to the user resulting in bad experience. The traditional CAPTCHAs also fail to take into account the unique needs of the ubiquitous mobile devices. These mobile devices have few limitations like small display area, limited display resolution, color combinations of the display, processing power etc. Also, they have unique advantages of touch sensitive input devices, voice inputs, voice outputs etc. In this paper, we present a scheme for a CAPTCHA service on Cloud, which is specific to mobile application. We duly consider the need of usability and presentation that is required for a mobile device in our implementation. The proposed CAPTCHA framework offers scalable and flexible implementation opportunities in many verticals and domains. Another unique feature of our framework is that we provide the facility for distributed verification. This greatly improves the efficiency at the CATPCHA generation as well as reduces the response time for the user authentication as human. © 2012 IEEE.

Angel-Bello F.,Tecnolgico de Monterrey | Alvarez A.,Autonomous University of Nuevo León | Pacheco J.,University of Burgos | Martinez I.,Tecnolgico de Monterrey
Computers and Mathematics with Applications | Year: 2011

In this paper we study a problem of sequencing jobs in a machine with programmed preventive maintenance and sequence-dependent setup times. To the authors' knowledge, this problem has not been treated as such in the operations research literature. Computational experiments show that it is very hard to solve the problem by exact methods. Therefore, the contribution of this paper is to design and implement a solution approach based on metaheuristic procedures. The proposed method finds high quality solutions in very short computational times. © 2010 Elsevier Ltd. All rights reserved.

Celaya-Padilla J.M.,Tecnolgico de Monterrey | Galvan C.E.T.,Autonomous University of Zacatecas | Delgado J.R.C.,Tecnolgico de Monterrey | Galvan-Tejada I.,Autonomous University of Zacatecas | Sandoval E.I.,Autonomous University of Zacatecas
Procedia Engineering | Year: 2012

Actually we have a large number of devices which can take pictures, from a digital camera to a cell phone, one of the problems is that usually at moment to take the picture we don't see some errors that can be present in the image until we observe it in a computer or printed image, this is a problem, because is almost impossible to recapture the moment in a new photo, to find a solution for this problem come the need implement a method to correct some of the defects that appear. In this paper we compare two texture synthesis methods and propose an algorithm to patch an original image, using a multi seed generated texture image. © 2012 Published by Elsevier Ltd.

Hernandez O.,Tecnolgico de Monterrey | Ramirez C.,Tecnolgico de Monterrey | Villeda J.,Tecnolgico de Monterrey
IEEE Workshop on Statistical Signal Processing Proceedings | Year: 2011

A variety of signal processing methods have been developed for detecting the heartbeat from signals obtained by non-invasive devices. In this paper, an algorithm developed for the accurate detection of heartbeats from a ballistocardiography signal is presented. The signal is obtained using a regular chair adapted with Electro-Mechanical Film (EMFi) sensors and an acquisition system, so a ballistocardiogram is generated. The presence of important disturbances in this type of signal is unavoidable due to several natural causes; therefore, its processing involves significant difficulties to be tackled in order to obtain reliable lectures of the heartbeat. The algorithm presented here performs consistently well, showing a very low error rate, even if the signal contains significant noise. © 2011 IEEE.

Lozoya-Santos J.D.J.,Tecnolgico de Monterrey | Morales-Menendez R.,Tecnolgico de Monterrey | Ramrez Mendoza R.A.,Tecnolgico de Monterrey
Mathematical Problems in Engineering | Year: 2012

Two controllers for an automotive suspensions with Magneto-Rheological (MR) dampers are proposed. One is a model-based using the Linear Parameter Varying (LPV) approach, and the other is a model-free controller with a Frequency Estimation Based (FEB) principle. The LPV controller includes an experimental nonlinear model of an MR damper using only one scheduling parameter. A comparison with a several semiactive controllers for comfort and road holding is discussed. The FEB controller is the best option based on frequency and time response analysis for comfort (1020), suspension deflection (3050), and road holding (15). © 2012 Jorge de Jesús Lozoya-Santos et al.

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