1,720,984 research outputs found
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
Beiträge zur kombinatorischen Geometrie
No full textIn this dissertation we investigate some problems from the field of combinatorics and computational geometry which involve basic geometric entities (points, lines, and circles).
In the first part we look at Erdös-Szekeres type problems: The classical theorem by Erdös and Szekeres from 1935 asserts that, for every natural number , every sufficiently large point set in general position contains a subset of points in convex position - a so called "-gon". We will investigate the famous variant of "-holes", which are -gons with the additional property that no other point lies in the convex hull of the -hole. This variant differs from the original setting as there exist arbitrarily large point sets which do not contain 7-holes. Besides the existence of holes, also the number of -holes in sets of points have been studied intensively. It is well-known that point configurations contain at least quadratically many 3- and 4-holes, respectively, while point configurations with only quadratically many holes exist. Concerning 5- and 6-holes, the best published lower bounds were only linear at the time when I started my studies.
In this thesis we present the first superlinear lower bound on the number of 5-holes, which is the first asymptotic improvement since Harborth's linear lower bound from 1978. For our proof we combine classical paper-and-pen proofs with lemmas that were proven using heavy computer asstistance. We also develop a framework based on Boolean logic to investigate various combinatorial properties of point sets with the aid of SAT solvers.
In the second part we investigate arrangements of circles. Towards a better understanding of their structure and also to get rid of geometric difficulties, we look at the more general setting of "arrangements of pseudocircles" which was first introduced by Grünbaum in the 1970's. An arrangement of pseudocircles is a collection of simple closed curves on the sphere or in the plane such that any two of the curves are either disjoint or intersect in exactly two points, where the two curves cross. In his book, Grünbaum conjectured that every digon-free arrangement of n pairwise intersecting pseudocircles contains at least 2-4 triangular cells. We present arrangements to disprove this conjecture and give new bounds on the number of triangular cells for various classes of arrangements. Furthermore, we study the "circularizability" of arrangements: it is clear that every arrangement of circles is an arrangement of pseudocircles, however, deciding whether an arrangement of pseudocircles is isomorphic to an arrangement of circles is computationally hard. Using a computer program, we have enumerated all combinatorially different arrangements of up to 7 pseudocircles. For the class of arrangements of 5 pseudocircles and for the class of digon-free intersecting arrangements of 6 pseudocircles, we give a complete classification: we either provide a circle representation or a non-circularizability proof. For these proofs we use incidence theorems like Miquel's and arguments based on continuous deformation, where circles of an assumed circle representation grow or shrink in a controlled way.
In the third and last part we summarize the results from Part I and Part II, and discuss further questions.In dieser Dissertation untersuchen wir Probleme aus den Gebieten Kombinatorik und Algorithmische Geometrie auf elementaren geometrischen Entitäten (Punkten, Linien und Kreisen).
Im ersten Teil betrachten wir sogenannte "Erdös--Szekeres type problems": Ein klassisches Resultat von Erdös und Szekeres aus dem Jahr 1935 besagt, dass für jede natürliche Zahl jede hinreichend große Punktmenge in allgemeiner Lage eine Teilmenge von Punkten in konvexer Lage enthält - sogenannte "-Gons". Wir untersuchen eine berühmte Variation: Ein "-Loch" ist ein -Gon mit der zusätzlichen Eigenschaft, dass kein weiterer Punkt in der konvexen Hülle des -Lochs liegt. Diese Variante unterscheidet sich vom ursprünglichen Problem da beliebig große Punktmengen ohne 7-Löcher existieren. Neben der Existenz von -Löchern wurde auch die Anzahl an -Löchern in -Punktmengen intensiv untersucht. Jede Punktmenge hat mindestens quadratisch viele 3-Löcher und 4-Löcher, und Punktmengen mit nur quadratisch vielen Löchern existieren. Zu Beginn meines Studiums waren für 5-Löcher und 6-Löcher nur lineare untere Schranken bekannt.
In dieser Dissertation präsentieren wir die erste superlineare untere Schranke für die Anzahl an 5-Löchern. Dies ist die erste asymptotische Verbesserung seit Harborths linearer Schranke aus dem Jahr 1978. Für unseren Beweis kombinieren wir traditionelle Beweismethoden mit Lemmas, welche mithilfe von Computerunterstützung verifiziert wurden. Des Weiteren entwickeln wir ein auf Boolescher Aussagenlogik basierendes Framework, welches die Untersuchung diverser kombinatorischer Eigenschaften von Punktmengen mittels SAT-Solver erlaubt.
Im zweiten Teil untersuchen wir Arrangements von Kreisen. Um ein besseres Verständnis derer Strukturen zu erhalten und um geometrischen Schwierigkeiten auszuweichen, betrachten wir "Arrangements von Pseudokreisen" - eine Verallgemeinerung von Kreisarrangements, die von Grünbaum in den 1970er Jahren eingeführt wurde. Ein Pseudokreisarrangement ist eine Menge von einfachen geschlossenen Kurven auf der Sphäre oder in der Ebene mit der Eigenschaft, dass je zwei dieser Kurven disjunkt sind oder sich in genau zwei Punkten schneiden. In seinem Buch präsentierte Grünbaum die Vermutung, dass jedes Digon-freie Arrangement von sich paarweise schneidenden Pseudokreisen mindestens 2-4 Dreieckszellen enthält. Wir präsentieren Arrangements, die diese Vermutung widerlegen und geben neue Schranken für die Anzahl an Dreieckszellen für unterschiedliche Klassen von Arrangements an. Des Weiteren untersuchen wir die "Kreisbarkeit" von Arrangements: Offensichtlich ist jedes Kreisarrangement auch ein Pseudokreisarrangement - es ist jedoch schwer zu entscheiden, ob ein gegebenes Pseudokreisarrangement durch Kreise representiert werden kann. Mit Hilfe eines Computerprogrammes konnten wir alle kombinatorisch unterschiedlichen Arrangements mit bis zu 7 Pseudokreisen enumerieren. Für Arrangements mit 5 Pseudokreisen und für Digon-freie Arrangements von 6 sich paarweise schneidenden Pseudokreisen geben wir eine vollständige Klassifizierung an: Entweder geben wir eine Kreisrepresentation oder einen Nichtkreisbarkeitsbeweis an. Diese Beweise basieren auf Inzidenztheoremen (z.B. dem Satz von Miquel) und Deformations-argumenten, in welchen wir Kreise einer angenommenen Kreisrepresentation in einer kontrollierten Weise ausweiten oder schrumpfen.
Im dritten und letzten Teil fassen wir die Ergebnisse aus Teil I und Teil II zusammen, und diskutieren weiterführende Fragen.EC/FP7/267165/EU/DISCRETE AND CONVEX GEOMETRY: CHALLENGES, METHODS, APPLICATIONS/DISCON
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
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