1,721,485 research outputs found
Los sistemas integrables H3 y H4 /
No full text\ua0tesis que para obtener el grado de Doctor en Ciencias (Física), presenta Marcos Alejandro García García ; asesor Alexander Turbiner Rosenbaum, Juan Carlos López Vieyra, Antonmaria Minzoni Alessio. ii, 170 páginas :\ua0ilustraciones. Doctorado en Ciencias (Física)\ua0UNAM, Facultad de Ciencias,\ua0201
Modelos de series temporales para la detección de parcelas control en áreas incendiadas
Get PDFPonencia presentada en el Sexto Congreso de Matemática Aplicada, Computacional e Industrial (VI MACI 2017 ), 2 al 5 de mayo de 2017 – Comodoro Rivadavia, Chubut, ArgentinaFil: Ojeda, Silvia María. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Landi, Marcos Alejandro. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Landi, Marcos Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Córdoba. Instituto de Diversidad y Ecología Animal; Argentina.Los regímenes naturales de incendios han experimentado cambios notorios en los últimos años. Ello ha motivado el desarrollo de herramientas capaces de monitorear la recuperación post-fuego de la vegetación en las zonasafectadas. Algunas de estas técnicas se basan en el estudio de series temporales de índices de vegetación obtenidas a partir de satélites de alta resolución temporal. Lo habitual consiste en comparar la serie temporal de vegetación de unaparcela quemada, con la de una parcela llamada "control", no quemada, de la que se requiere que posea una estructura de vegetación con igual funcionamiento biológico que la de la parcela quemada, antes del incendio. En este trabajo proponemos e implementamos computacionalmente una rutina basada en técnicas de series temporales, que define un mecanismo capaz de seleccionar adecuadamente parcelas control.Fil: Ojeda, Silvia María. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Landi, Marcos Alejandro. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Landi, Marcos Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Córdoba. Instituto de Diversidad y Ecología Animal; Argentina.Estadística y Probabilida
Estudio de caso para la evaluación de precisiones obtenidas en relevamiento topográfico utilizando vant: navegador gps vs. puntos de apoyo fotogramétrico
No full textFil: Reche, Marcos Alejandro. Universidad Nacional de Luján; Argentina.Las Tecnologías de la Información Geográfica (TIG) combinan hardware, software y técnicas científicas para manejar información georreferenciada, permitiendo su aplicación interdisciplinaria. Su desarrollo, impulsado por los Sistemas de Información Geográfica (SIG), ha transformado la manera de conceptualizar la realidad geográfica mediante un Paradigma Geotecnológico con enfoque espacial. En la práctica, la Geografía aporta conocimientos a diversas disciplinas a través de herramientas como cartografía digital, imágenes satelitales, fotogrametría, posicionamiento global y Drones/VANT, integradas en la Geoinformática. En este estudio, se empleará fotogrametría con Drones y SIG para relevar información de campo y diseñar sistemas de terrazas para el control de erosión hídrica
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
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