1,720,954 research outputs found
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
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
Controlador em cascata com adaptação de parâmetros para robôs hidráulicos
Get PDFTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2010Este trabalho trata do problema de controle de robôs hidráulicos que utilizam válvulas proporcionais direcionais com centro supercrítico realizando seguimento de trajetória de posição e tem enfoque na compensação de zona morta destas válvulas. Os robôs hidráulicos apresentam grande capacidade de carga e um grande potencial de aplicação na indústria. Isto se deve a elevada relação força/dimensão dos atuadores hidráulicos e a capacidade que possuem para responder de forma rápida aos sinais de comando. No entanto, os robôs hidráulicos oferecem algumas dificuldades ao controle. Há, por exemplo, acoplamento de dinâmicas, dificuldades da estimativa de parâmetros do modelo matemático, variação de alguns parâmetros durante a operação e comportamento não-linear provocado pelo atrito no cilindro hidráulico e pela zona morta das válvulas proporcionais direcionais de centro supercrítico. Neste trabalho, uma estratégia de controle em cascata é aplicada com objetivo de superar estas dificuldades. Esta estratégia tem como característica a divisão do modelo matemático do robô hidráulico em subsistemas e permite a aplicação de técnicas de controle não-linear para superar as dificuldades inerentes de cada subsistema. Tanto o atrito no cilindro hidráulico quanto a zona morta da válvula provocam os erros de seguimento de trajetória do robô. O atrito influi na dinâmica do movimento no subsistema mecânico que tem como entrada a força produzida no cilindro pelo subsistema hidráulico e como saída a posição angular dos elos do robô. Os erros de seguimento de posição dos elos provocados pelo atrito podem ser reduzidos através de sua compensação direta no subsistema mecânico utilizando observadores de atrito baseados em modelos dinâmicos. A zona morta retarda a abertura da válvula gerando erros significativos de seguimento de força no subsistema hidráulico. Sua compensação pode ser realizada através de uma função inversa da zona morta. Assim, apresenta-se um controlador em cascata capaz de compensar a dinâmica da válvula e sua zona morta, a dinâmica da força hidráulica, do atrito e do movimento dos elos do robô. Apresentam-se, também, leis de adaptação de parâmetros para a função inversa da zona morta. A implementação destas leis adaptativas tem como objetivo principal a redução dos erros de seguimento no subsistema hidráulico através da compensação da zona morta e, consequentemente, a redução dos erros de seguimento de posição angular dos elos do robô. Mostra-se, através da análise de estabilidade por Lyapunov e de forma experimental, que os erros resultantes do seguimento de trajetória convergem para um conjunto residual mesmo quando o controlador em cascata não realiza a compensação do atrito e da dinâmica da válvula, mas utiliza as leis de adaptação e a compensação de zona morta propostas neste trabalho. Os resultados teóricos e experimentais permitem concluir que a compensação de zona morta também pode compensar, de forma indireta, outras dinâmicas como a do atrito.This work addresses the problem of controlling hydraulic robots using overlapped proportional valves which perform trajectory tracking, with special focus on the dead-zone compensation of these valves. Hydraulic robots present great load capability and a huge potential of application in the industry. This is due to the high torque/size ratio of the hydraulic actuators and its ability to respond quickly to control signals. However, hydraulic robots introduce some difficulties to the control. There are, for example, dynamic coupling, problems to estimate the mathematical model parameters, changes in some parameters during operation and a nonlinear behavior mainly caused by friction in the hydraulic cylinder and the dead-zone of overlapped proportional valves. In this work, a cascade control strategy is applied to surpass these difficulties. This strategy is based on the division of the hydraulic robot mathematical model into subsystems and allows the application of nonlinear control techniques to overcame the inherent difficulties in each subsystem. Both the friction in the hydraulic cylinder and the dead-zone of the valve cause tracking errors in the robot trajectory. Friction influences the motion dynamics in the mechanical subsystem which has as input the force produced in the cylinder by the hydraulic subsystem and as output the angular position of the robot links. Tracking errors of the links positions caused by friction can be reduced through its direct compensation in the subsystem using mechanical friction observers based on dynamic models. The dead-zone slows the opening of the valve causing significant force tracking errors in the hydraulic subsystem. The compensation can be accomplished through an inverse function of the deadzone. Thus, this work presents a cascade controller able to compensate the dynamics of the valve and the dead-zone, the dynamics of the hydraulic force, friction and motion of the robot links. Adaptation laws for the dead-zone inverse function are also presented. The adaptation laws implementation has the main goal to reduce tracking errors of the hydraulic subsystem through the dead-zone compensation and consequently the reduction of angular position tracking errors of the robot. It is shown through Lyapunov stability analysis and through experimental ents that position tracking errors converge to a residual set even when the cascade controller does not perform compensation for friction and valve dynamics, but using only the adaptation laws and dead-zone compensation proposed in this work. Theoretical and experimental results showed that the dead-zone compensation may also compensate, indirectly, other dynamics such as friction
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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