1,720,972 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
The Algorithm of Frolov for numerical integration
No full textsubmitted by Falkensteiner SebastianMasterarbeit Universität Linz 201
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
Potenzreihenlösungen von AODEs - Existenz, Eindeutigkeit, Konvergenz und Berechnung
No full textDifferentialgleichungen werden seit langer Zeit intensiv studiert. Für diverse Spezialfälle wurden Methoden zur Beschreibung von exakten Lösungen entwickelt, jedoch gibt es im allgemeinen Fall keinen Algorithmus zur Berechnung von expliziten Lösungen.
In dieser Arbeit werden algebraische gewöhnliche Differentialgleichungen studiert und neue Methoden zur Berechnung aller formalen Potenzreihenlösungen mit nicht-negativen ganzzahligen Exponenten oder gebrochen rationalen Exponenten, sogenannte Puiseux-Reihen, vorgestellt. Mit Berechnung aller Lösungen ist die Beschreibung der Lösungsmenge bestehend aus Potenz-und Puiseux-Reihen durch eine Menge von abgebrochenen Reihen mit endlich vielen Summanden gemeint, sodass sich die Elemente dieser beiden Mengen eindeutig miteinander identifizieren lassen. Zusätzlich zu den Potenz- und Puiseux-Reihen betrachten wir auch algebraische Lösungen, welche implizit durch ihr definierendes Minimalpolynom dargestellt werden können. Zu diesem Zweck verwenden wir drei verschiedene Ansätze: den direkten Ansatz mittels Koeffizientenvergleich, die Newton-Polygon Methode für Differentialgleichungen und den algebraisch-geometrischen Ansatz.
Die ersten beiden Methoden sind relativ gut Beschrieben in der bereits existierenden Literatur, aber ihre Anwendung garantiert im Allgemeinen weder Existenz, Eindeutigkeit noch Konvergenz der Lösungen. Für bestimmte Familien von Differentialgleichungen jedoch sind wir in der Lage diese Eigenschaften zu beweisen. Der algebraisch-geometrische Ansatz transformiert das gegebene differentielle Problem in ein algebraisches. Algebraische Differentialgleichungen definieren implizit algebraische Mengen, an denen Methoden aus der algebraischen Geometrie angewandt werden können. Das Hauptresultat der Dissertation ist die exakte Formulierung des Zusammenhangs zwischen dem differentiellen und algebraischen Problem und die Anwendung der algebraischen Geometrie, um die oben genannten Eigenschaften wie Existenz, Eindeutigkeit und Konvergenz von Lösungen zu zeigen. Insbesondere können für algebraische Kurven die entsprechende gut durchleuchtete Theorie von formalen Parametrisierungen und deren Äquivalenzklassen verwendet werden. Zum Beispiel algebraische gewöhnliche Differentialgleichungen erster Ordnung mit konstanten Koeffizienten entsprechen ebenen Kurven. Von einer bereits bestimmten lokalen Parametrisierung kann nun eine assozierte Differentialgleichung eines bestimmten Types aufgestellt werden, die sich durch die Newton-Polygon Methode für Differentialgleichungen vollständig analysieren und lösen lassen. Die Hintereinanderausführung der lokalen Parametrisierung und der Lösungen der assozierten Differentialgleichung sind Lösungen der ursprünglichen Differentialgleichung.
Für Differentialgleichungen, welche die unbekannte Funktion und die zweite Ableitung davon enthalten, lassen sich durch diese Herangehensweise ähnliche Resultate erzielen. Wir behandeln auch Systeme von gewöhnlichen Differentialgleichungen welche algebraische Mengen in Form von Raumkurven entsprechen. Diese Systeme lassen sich durch die Anwendung von sogenannten regulären Ketten auf eine einzelne Differentialgleichung zurückführen, welche von obigem Typ ist, wodurch sich die Eigenschaften der Lösungen auf solche Systeme verallgemeinern lassen.Differential equations have been intensively studied for a long time. There exist several methods for describing exact solutions for specific cases. Nevertheless, there is no general algorithm for computing explicit exact solutions.
In this thesis we consider algebraic ordinary differential equations (shortly AODEs) and investigate new methods for computing all formal power series solutions with non-negative integer exponents or fractional exponents, so-called formal Puiseux series. By "computing all" solutions we mean to describe the set of formal power series or Puiseux series solutions by a set of truncations such that these two sets are in one-to-one correspondence. Additionally to these solutions we also consider algebraic solutions, which can be represented implicitly by its defining minimal polynomial. For this purpose, we study three different approaches: the direct approach by comparison of coefficients, the Newton polygon method for differential equations and the algebro-geometric approach.
The first two approaches are well described in the literature, but both neither ensure existence, uniqueness nor convergence in the general situation. For certain families of differential equations, however, we are able to prove these properties. The algebro-geometric approach transforms the differential problem into an algebraic one by considering the given differential equations as algebraic equations. Algebraic equations implicitly define algebraic sets where tools from algebraic geometry can be applied. The main result of the thesis is to precisely state the relation between the differential and algebraic problem and use the results from algebraic geometry in order to show properties of the solutions of the algebraic problem such as the existence, uniqueness and convergence. In particular, for algebraic curves we can use the well-developed theory on formal parametrizations and its equivalence classes under substitution with formal power series of order one, namely places. Plane algebraic curves on the algebraic side get derived for example from first order autonomous AODEs on the differential side. From a given local parametrization we can then derive an associated differential equation which is exactly of the type we can fully analyze by the Newton polygon method for differential equations; in particular it is of order one and degree one. Then the composition of the parametrization and a solution of the associated differential equation yields a solution of the original differential equation. For differential equations involving the differential indeterminate and the second derivative of it we obtain similar properties of the solutions.
We also deal with systems of autonomous AODEs whose corresponding algebraic set is of dimension one, namely a space curve. For those systems, by using regular chains, we are able to derive a single first order autonomous AODE which enables us to generalize the main properties of formal Puiseux series and algebraic solutions to such systems.submitted by Dipl.-Ing. Sebastian FalkensteinerAbweichender Titel laut Übersetzung der Verfasserin/des VerfassersDissertation Universität Linz 202
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
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