1,721,018 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
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
Incompressible fluid simulation and advanced surface handling with SPH
Get PDFIn den letzten Jahren haben partikelbasierte Methoden zur Simulation von Gasen und Flüssigkeiten in der Computer Graphik an Wichtigkeit gewonnen. Dies da die Repräsentation durch Partikel die Behandlung von freien Oberflächen, Spritzer, Tropfen und komplexen Interaktionen zwischen Objekten erleichtert. Partikelbasierte Methoden weisen jedoch auch Nachteile auf welche das physikalische Verhalten eines Fluids und somit das resultierende visuelle Resultat beeinträchtigen. Obwohl diese Probleme in sozusagen allen partikelbasierten Modellen präsent sind, konzentriert sich diese Dissertation auf die Hauptprobleme der Methode Smoothed Particle Hydrodynamics (SPH). Diese Dissertation beginnt mit einer Einführung in die SPH Methode und erklärt die Schwierigkeit inkompressible Flüssigkeiten zu simulieren. Im Grundmodell von SPH werden Flüssigkeiten durch kompressible Fluide approximiert was zu ungewollten Kompressionsartefakten führt. Obwohl Inkompressibilität erzwungen werden kann, repräsentiert dies den berechenmässig teuersten Teil der Methode, was der Grund ist warum SPH und partikelbasierte Methoden im Allgemeinen weniger geeignet sind um photorealistische Animation von Wasser zu erstellen. In dieser Arbeit präsentieren wir ein neues, inkompressibles Verfahren basierend auf SPH welche Inkompressibilität durch eine Prädiktor-Korrektor Methode erzwingt. Dabei werden die Informationen uber Dichteabweichungen aktiv durch das Fluid propagiert und Druckwerte angepasst, solange bis die Dichtewerte der Partikel einheitlich sind. Mit diesem Ansatz können die Berechnungskosten per Simulationsschritt niedrig gehalten und gleichzeitig ein grosser Simulationszeitschritt verwendet werden. Danach gehen wir auf die Probleme ein welche an den Zwischenflächen von mehreren Fluiden mit unterschiedlicher Dichte entstehen, sowie zwischen Fluiden und festen Objekten. Bei der Simulation von mehreren Fluiden mit dem SPH Grundmodell können Artefakte an der Zwischenfläche beobachtet werden, welche das Verhalten der Fluide negativ beeinflusst. Diese Artefakte sind unphysikalische Oberflächenspannungen sowie numerische Instabilitäten. Diese Dissertation präsentiert ein adaptiertes SPH Modell welches Diskontinuitiäten an den Zwischenflächen von mehreren Fluiden korrekt behandelt und dadurch die Probleme des Grundmodells vermeidet. Des Weiteren prä sentiert diese Arbeit ein einheitliches Modell für die Simulation von Fluiden und festen Objekten um die Interaktion zwischen unterschiedlichen Materialien zu erleichtern. In unserem Modell sind Flüssigkeiten und Gase sowie starre und elastische Körper durch Partikel repräsentiert welche Attribute mit den Objekteigenschaften tragen. Durch das Andern der Attribute können Effekte wie Schmelzen und Erstarren, sowie Vereinigung und Trennung von Objektteilen mit niedrigem Aufwand simuliert werden. Zum Abschluss stellen wir eine neue, effiziente Partikel-Verfeinerungsmethode vor um eine höhere visuelle Qualität beim Rendering von Echtzeit-Flüssigkeiten zu erreichen. Als Ausgangspunkt verwendet unsere Methode die Punktmenge der Simulation und fügt uniform neue Punkte hinzu wobei Oberflächenstrukturen akkurat beibehalten werden. Eine weitere Schwierigkeit von Partikelmethoden ist die Rekonstruktion von glatten Oberflächen. Um dies zu erreichen verwenden wir eine neue Methode, welche den Partikelschwerpunkt der Nachbarschaft bei der Rekonstruktion verwendet, und wir zeigen wie Artefakte in konkaven Regionen erfolgreich vermieden werden können.
Particle-based fluid simulations have become popular in computer graphics due to their natural ability to handle free surfaces and interfaces, splashes and droplets, as well as interaction with complex boundaries. However, particle methods have some disadvantageous properties degrading the physical behavior of a simulated fluid and thus the resulting visual quality. Although these problems are present in almost any particle-based fluid solver, this dissertation addresses some of the major problems of the Lagrangian method Smoothed Particle Hydrodynamics (SPH). This thesis starts by reviewing the standard SPH model and its difficulties to satisfy the incompressibility condition. In the standard model, liquids are typically approximated by compressible fluids where pressures are determined by an equation of state, resulting in undesired compression artifacts. Although incompressibility can be enforced, it represents the most expensive part of the whole simulation process and thus renders particle methods less attractive for high quality and photorealistic water animations. In this thesis, we present a novel, incompressible fluid simulation method based on SPH. In our method, incompressibility is enforced by using a prediction-correction scheme to determine the particle pressures. For this, the information about density fluctuations is actively propagated through the fluid and pressure values are updated until the targeted density is sat- isfied. With this approach, the costs per simulation update step can be held low while still being able to use large time steps in the simulation. Next, we shift our attention to the problem of complex interactions between multiple different fluids as well as between fluids and solids. We first focus on the artifacts caused by standard SPH when simulating multiple fluids with high-density ratios. In the standard model, the smoothed quantities of particles near the fluid interface show falsified values and the physical behavior is severely affected, especially if density ratios become large. The artifacts include spurious and unphysical interface tension as well as severe numerical instabilities. In this thesis, we derive a formulation that can handle discontinuities at interfaces of multiple fluids correctly and thus avoids the problems present in standard SPH. With our concepts, an animator has full control over the behavior of multiple interacting fluids. Furthermore, we propose to represent both, fluids and solids, by particles, facilitating the interaction between the different object types. We present a unified simulation model for fluids, rigid, and elastic objects, and show how phase transitions can be modeled by only changing the attribute values of the underlying particles. New effects like merging and splitting due to melting and solidification are demonstrated, and we show that our model is able to handle coarsely sampled and even coplanar particle configurations without further treatment. Finally, we present a novel point refinement method to achieve a higher visual quality of low-resolution fluids. We introduce new algorithms to efficiently upsample an initial point set given by the physical computation. Our method features the ability to accurately preserve surface details and to reach a uniform point distribution. Another challenge is to reconstruct smooth surfaces from the particles. The visualized fluids typically suffer from bumpy surfaces related to the irregular particle distribution. In order to achieve smooth surfaces, this thesis introduces a new surface reconstruction technique based on the center of mass of the particle neighborhood. We show how artifacts in concave regions can be avoided by considering the movement of the center of mass
- …
