Sistema Hidrobid II para simular corrientes en cuencos

Se presenta el sistema computacional HIDROBID II, que se utiliza para simular flujos cuasibidimensionales a superficie libre. Está basado en la resolución numérica de las ecuaciones para aguas poco profundas. Se utiliza un método implícito de direcciones alternadas. El sistema puede simular contornos externos cerrados (costa) y abiertos (entrante, saliente y libre), y bordes internos (obstáculos unidimensionales que representan ataguias, espigones, etc.) eventualmente combinados con singularidades como fuentes y sumideros que representan estructuras (vertederos, alcantarillas, etc.). Se presentan varias aplicaciones.Peer Reviewe

Sistema Hidrobid II para simular corrientes en cuencos

Se presenta el sistema computacional HIDROBID II, que se utiliza para simular flujos cuasibidimensionales a superficie libre. Está basado en la resolución numérica de las ecuaciones para aguas poco profundas. Se utiliza un método implícito de direcciones alternadas. El sistema puede simular contornos externos cerrados (costa) y abiertos (entrante, saliente y libre), y bordes internos (obstáculos unidimensionales que representan ataguias, espigones, etc.) eventualmente combinados con singularidades como fuentes y sumideros que representan estructuras (vertederos, alcantarillas, etc.). Se presentan varias aplicaciones.Peer Reviewe

An Improved GPU Simulator For Spiking Neural P Systems

Spiking Neural P (SNP) systems, variants of Psystems (under Membrane and Natural computing), are computing models that acquire abstraction and inspiration from the way neurons 'compute' or process information. Similar to other P system variants, SNP systems are Turing complete models that by nature compute non-deterministically and in a maximally parallel manner. P systems usually trade (often exponential) space for (polynomial to constant) time. Due to this nature, P system variants are currently limited to parallel simulations, and several variants have already been simulated in parallel devices. In this paper we present an improved SNP system simulator based on graphics processing units (GPUs). Among other reasons, current GPUs are architectured for massively parallel computations, thus making GPUs very suitable for SNP system simulation. The computing model, hardware/software considerations, and simulation algorithm are presented, as well as the comparisons of the CPU only and CPU-GPU based simulators.Ministerio de Ciencia e Innovación TIN2009–13192Junta de Andalucía P08-TIC-0420

Movies Tags Extraction Using Deep Learning

Retrieving information from movies is becoming increasingly demanding due to the enormous amount of multimedia data generated each day. Not only it helps in efficient search, archiving and classification of movies, but is also instrumental in content censorship and recommendation systems. Extracting key information from a movie and summarizing it in a few tags which best describe the movie presents a dedicated challenge and requires an intelligent approach to automatically analyze the movie. In this paper, we formulate movies tags extraction problem as a machine learning classification problem and train a Convolution Neural Network (CNN) on a carefully constructed tag vocabulary. Our proposed technique first extracts key frames from a movie and applies the trained classifier on the key frames. The predictions from the classifier are assigned scores and are filtered based on their relative strengths to generate a compact set of most relevant key tags. We performed a rigorous subjective evaluation of our proposed technique for a wide variety of movies with different experiments. The evaluation results presented in this paper demonstrate that our proposed approach can efficiently extract the key tags of a movie with a good accuracy

El método de Glimm

RESUMEN En contraste con otros métodos numéricos tales como diferencias finitas o elementos finitos, el método de Glimm resuelve las ondas de choque y otras discontinuidades con relativa facilidad y sin necesidad de adicionar términos de viscosidad artificial. Desafortunadamente la literatura existente sobre dicho método es, en general, difícil de entender por aquellos que encaran su estudio por primera vez. Trataremos aquí de presentar una introducción sencilla del método de Glimm y sus principales aplicaciones. SUMMARY Contrarily to other numerical methods such as finite differences or finite elements, the Glimm s Method resolves impact waves or other discontinuities with relative facility and without being necessary to add artificial viscosity terms. Unfortunately, the existing litterature on this method is, en general, difficult to understand for those who study it for the first time. Here, we shall try to present a simple introduction on the Glimm s Method and its principal applications.Peer Reviewe

Estudio de las condiciones de agitación por oleaje en un puerto mediante simulación numérica

Se describe una aplicación del sistema computacional DIFRAC para estudiar la s condiciones de agitación por oleaje dentro de un puerto, teniendo en cuenta el efecto combinado de difracción, refracción y reflexión de las olas . Se presentan resultados para la amplitud y dirección de propagación del oleaje en su interior y de las condiciones de resonancia en la s distintas dársenas del puerto .Peer Reviewe

Multifractal patterns formed by laser irradiation in GeAl thin multilayer films

Structures induced in GeAl thin multilayer films by laser irradiation are studied. We compute their multifractal spectra from digitized transmission-electron micrographs. The results show that the patterns, which arise from a diffusion process followed by rapid solidification, are fractal, and that they cannot be described by a unique scaling exponent. © 1992 The American Physical Society.This work was partially supported by the Comision Interrninisterial de Ciencia y Tecnologia (CICyT) of Spain under Project Nos. MAT88-0437 and MAT90-0544.Peer Reviewe

Rapid detection of multidrug-resistant Mycobacterium tuberculosis by multiplex allele-specific polymerase chain reaction

OBJECTIVE: To evaluate a multiplex allele-specifi c polymerase chain reaction (MAS-PCR) to detect multidrugresistant tuberculosis (MDR-TB) clinical isolates and to describe the main mutations conferring resistance to isoniazid (INH) and rifampicin (RMP). DESIGN: Drug-resistant Mycobacterium tuberculosis clinical isolates were tested to detect mutations using MAS-PCR. The genes involved were katG, inhA promoter and rpoB. RESULTS: Among 193 clinical isolates included in the study, 52.6% of the INH-resistant isolates presented a mutation in the katG (315) gene, 28.1% in the inhAP (−15) and 3.0% in both. For the rpoB gene, 60% of the RMP-resistant isolates showed a mutation in codon 531, 17.5% in 526 and 2.5% in 516. Results were compared with those obtained by sequencing, and 100% concordance was obtained for the detection of the mutation in katG (315), 94.1% for inhAP (−15), and 97.8% for rpoB. The global concordance between both methods was 98%. CONCLUSIONS: The MAS-PCR system allowed the simultaneous and rapid detection of approximately 80.0% of the drug-resistant clinical isolates. This method could be used as a rapid and simple screening tool to detect drug-resistant TB in clinical practice.Fil: Imperiale, Belén Rocío. Provincia de Buenos Aires. Ministerio de Salud. Hospital ; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Cataldi, Ángel Adrián. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Biotecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Morcillo, N. S.. Provincia de Buenos Aires. Ministerio de Salud. Hospital ; Argentin