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Machine learning techniques applied to multiband spectrum sensing in cognitive radios

This research received funding of the Mexican National Council of Science and Technology (CONACYT), Grant (no. 490180). Also, this work was supported by the Program for Professional Development Teacher (PRODEP).In this work, three specific machine learning techniques (neural networks, expectation maximization and k-means) are applied to a multiband spectrum sensing technique for cognitive radios. All of them have been used as a classifier using the approximation coefficients from a Multiresolution Analysis in order to detect presence of one or multiple primary users in a wideband spectrum. Methods were tested on simulated and real signals showing a good performance. The results presented of these three methods are effective options for detecting primary user transmission on the multiband spectrum. These methodologies work for 99% of cases under simulated signals of SNR higher than 0 dB and are feasible in the case of real signalsPeer ReviewedPostprint (published version

Robust principal component analysis-based prediction of protein-protein interaction hot spots.

AbstractProteins often exert their function by binding to other cellular partners. The hot spots are key residues for protein‐protein binding. Their identification may shed light on the impact of disease associated mutations on protein complexes and help design protein‐protein interaction inhibitors for therapy. Unfortunately, current machine learning methods to predict hot spots, suffer from limitations caused by gross errors in the data matrices. Here, we present a novel data pre‐processing pipeline that overcomes this problem by recovering a low rank matrix with reduced noise using Robust Principal Component Analysis. Application to existing databases shows the predictive power of the method

Espacios residuales: potencialidades

En el proceso de estructuración físico-espacial de las ciudades como en el territorio se van configurando un mapa de zonas “claras” marcadas por una buena calidad de vida y otras zonas “oscuras” constituidas por los espacios residuales y degradados. Si las primeras identifican una mirada sobre el paisaje, el territorio y la ciudad basada en principios sedimentados y compartidos, las segundas nos ofrecen una oportunidad para poner en discusión estos mismos principios y reflexionar sobre esos espacios residuales que constituyen un potencial nuevo paisaje. Desde la práctica arquitectónica, al igual que desde otras disciplinas, se intentan encontrar argumentaciones que permitan, por una parte, dar un contenido teórico al concepto que viene a representar ese nuevo paisaje y por otra, formular criterios para abordar la intervención en esos espacios abandonados que van quedando en un planeta cada vez más antropizado. Criterios que aspiran a complementarse en un marco de relaciones interdisciplinario más amplio de aquél de donde procede. El material que compone el trabajo que presento, aparece como prolongación asociada a una serie de experiencias docentes desarrolladas en el aula de proyectos arquitectónicos en la escuela de arquitectura de Sevilla. En esas, hemos ido reconociendo diversas manifestaciones de una cierta relación de la actividad humana con su medio natural, produciendo paisajes que bien podríamos encuadrar bajo el epígrafe de espacios residuales, en cuanto resultan partes de un todo que se ha visto transformado por esa actividad humana caracterizada por lo excesivo. Como objetivo común de todas las experiencias docentes ha sido la activación, mediante la explicitación y usos alternativos de las infraestructuras de esos territorios y de la acción rehabilitadora de sus soportes, de una habitabilidad que responda a una coyuntura de urgencia y necesidad. Con el título, Potencialidades, se propone romper con el principio que lleva a pensar el proyecto de intervención arquitectónica de acuerdo con un modelo o estado final que, previamente, se quiere obtener. Es decir, forzar a una ordenación en base a lo que debiera ser. Por el contrario, proponemos sumergirnos en el caos que representan esas situaciones y ver sus potencialidades, aprendiendo a relacionarnos con él. No se trata de mantener una actitud pasiva ante las cosas, sino de reconocer que en la materialidad de cada situación hay un potencial capaz de llevarnos más lejos

Injury assessment of common nage-waza judo techniques for amateur judokas

There are few detailed publications that allow performing associations between the technical aspects and the occurrence of injuries. The purpose of this study was to apply a methodology based in recording material to assess the injury risk factors. Common nage-waza judo techniques during regular training of amateur judokas were used as a case study. Novice students (n=193; 100 men and 93 women) from the University of Vigo during five academic years (2003 to 2008) were filmed during the ordinary training period of the technical execution of ten nage-waza techniques. The obtained data were evaluated using descriptive statistics and tpatterns analysis. Thus, it was possible to identify the presence of typical inaccuracies during execution of the technique uncovering the main temporal sequence of errors allowing us to link our findings with the injury occurrence. In order to narrow the unexpected causes of accidents regarding poor technique performance in regular training, this research provides the hidden temporal sequence of errors of common throw techniques, helping professionals to correct the key technical errors in order to prevent diverse type injuries. The methodology developed here could be easily extended to other martial sports.info:eu-repo/semantics/publishedVersio

Direct steam generation in parabolic trough collectors

Existing commercial parabolic trough power plants use thermal oil as a heat transfer fluid, with working temperatures in the region of 400ºC. In order to achieve more efficient generating systems, a second generation of parabolic troughs that operate at temperatures higher than 400ºC is being developed. One possibility, Abengoa Solar is assessing, it is the use of direct steam generation (DSG) inside parabolic troughs in order to achieve higher temperatures; the first stage heating up to 450 ºC and the second stage heating up to 550 ºC. There is, however, a certain degree of complexity in the use of DSG technology that has resulted in it not yet being utilized in commercial plant designs. Due to the presence of saturated steam inside the parallel loops the required control system is more complex, particularly during transitory periods of radiation. Also the higher operating pressures and temperatures in the solar field mean that the receiver tubes and interconnections between collectors are very critical components. For this reason, typical systems utilize an intermediate fluid for energy transfer. In order to overcome these challenges, Abengoa Solar has built a demonstration plant of 8 MWht. The plant is composed of an evaporator field with three parallel loops and a superheater field with two loops in order to work at 85 bar and 450ºC. The demonstration plant has been operated and evaluated for one year. During this test period, the following have been evaluated and validated: An innovative control strategy system that guarantees the stability of the plant even under transient conditions. Receiver tube design able to achieve 450ºC, analyzing the mechanical behavior, optical performance, and heat losses. Different configurations of interconnections between collectors with ball joints and flexible rotation joints. A theoretical model has been developed for commercial scale DSG plants and validated with experimental data obtained from the demonstration plant