1,720,966 research outputs found
Métodos computacionales en superresolución de imágenes
Full text linkTesis (Lic. en Matemática)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2014.Fil: Biedma, Luis Ariel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.En este trabajo se presenta un método determinı́stico para el problema de superresolución de imágenes desarrollado en [11]. Este problema ha
despertado el interés de matemáticos aplicados, estadı́sticos e ingenieros en los últimos años por sus importantes y potenciales aplicaciones a imágenes
satelitales y médicas entre otras. El objetivo consiste en obtener una imagen de alta resolución (HR) a partir de un conjunto de imágenes de baja
resolución (LR), sin utilizar nuevos sensores o hardware adicional. El problema es computacionalmente costoso debido a que los algoritmos deben tratar cientos de miles de datos eficientemente. Es formulado como un problema
inverso, y por lo tanto resulta mal condicionado, de allı́ que se debe tomar ventaja de la regularidad y estructura inherente del problema. Para tratar el
mal condicionamiento se utilizan precondicionadores adecuados y técnicas de regularización. Se presentan también resultados de convergencia del método estudiado. También se muestran resultados numéricos para validar el método estudiado.Fil: Biedma, Luis Ariel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina
Optimización del método de funciones sturmianas generalizadas
Full text linkTesis (Doctor en Matemática)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación, 2023.Fil: Biedma, Luis Ariel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Esta tesis doctoral presenta la formulación y marco de trabajo llevados a cabo para resolver
los denominados Sistemas Lineales Latentes: sistemas lineales cuya dimensión final no es
conocida a priori, pero cuyos elementos pueden ser calculados computacionalmente. Este
tipo de problemas se presenta al resolver las ecuaciones en derivadas parciales
relacionadas con la Ecuación de Schrödinger, la cual describe sistemas físicos en Mecánica
Cuántica, para simular sistemas atómicos de pocos cuerpos.
La formulación del algoritmo de resolución de sistemas lineales latentes se muestra como
un problema de actualización de factorizaciones matriciales, el cual es resuelto mediante la
aplicación de un algoritmo de factorización QR, utilizando técnicas de computación de alto
desempeño y produciendo una ejecución de código rápida y eficiente.This doctoral thesis presents a formulation and framework to solve Latent Linear Systems: linear systems with an a priori unknown dimension, but with a known formulation for the value of their elements. This kind of problem arises when solving PDEs related to the Schrödinger Equation, which describes physical systems in Quantum Mechanics, to simulate few body atomical systems.
The formulation of the algorithm is shown as a matrix factorization updating problem, which is solved via the QR factorization algorithm, using high performance computing and producing a fast and efficient execution of the code.Fil: Biedma, Luis Ariel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina
Figure 3 in Phylogeography of Crocidura suaveolens (Mammalia: Soricidae) in Iberia has been shaped by competitive exclusion by C. russula
No full textFigure 3. Median-joining network of cytochrome b clade IV haplotypes of Crocidura suaveolens, coloured according to lineage (A1, red; A2, yellow; B, orange; C1, light green; C2, dark green; C3, light blue; C4, dark blue). The diameter of the circles represents the number of sampled individuals with that haplotype. Black dots indicate unsampled intermediary haplotypes.Published as part of Biedma, Luis, Román, Jacinto, Calzada, Javier, Friis, Guillermo & Godoy, José A, 2018, Phylogeography of Crocidura suaveolens (Mammalia: Soricidae) in Iberia has been shaped by competitive exclusion by C. russula, pp. 81-95 in Biological Journal of the Linnean Society 123 (1) on page 86, DOI: 10.1093/biolinnean/blx126, http://zenodo.org/record/781789
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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