1,720,960 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
Auflösungen und Moduli äquivarianter Garben auf torischen Varietäten
Get PDFIn this thesis the combinatorial framework of toric geometry is extended to equivariant sheaves over toric varieties. The central questions are how to extract combinatorial information from the so developed description and whether equivariant sheaves can, like toric varieties, be considered as purely combinatorial objects. The thesis consists of three main parts. In the first part, by systematically extending the framework of toric geometry, a formalism is developed for describing equivariant sheaves by certain configurations of vector spaces. In the second part, homological properties of a certain class of equivariant sheaves are investigated, namely that of reflexive equivariant sheaves. Several kinds of resolutions for these sheaves are constructed which depend only on the configuration of their associated vector spaces. Thus a partially positive answer to the question of combinatorial representability is given. As a particular result, a new way for computing minimal resolutions for Z^n - graded modules over polynomial rings is obtained. In the third part a complete classification of the simplest nontrivial sheaves, equivariant vector bundles of rank two over smooth toric surfaces, is given. A combinatorial characterization is given and parameter spaces (moduli spaces) are constructed which depend only on this characterization. In appendices a outlook on equivariant sheaves and the relation of Chern classes to their combinatorial classification is given, particularly focussing on the case of the projective plane. A classification of equivariant vector bundles of rank three over the projective plane is given.In dieser Dissertation wird die torische Geometrie erweitert und ein Formalismus zur Beschreibung äquivarianter Garben über torischen Varietäten entwickelt. Die zentralen Fragen, die, darauf aufbauend, behandelt werden, sind: können von diesem Formalismus kombinatorische Information zur Charakterisierung äquivarianter Garben abgeleitet werden? Und können äquivariante Garben, wie auch die torischen Varietäten selber, als rein kombinatorische Objekte betrachtet werden? Die Dissertation besteht aus drei Teilen. Im ersten Teil wird, durch systematische Erweiterung der torischen Geometrie, ein Formalismus entwickelt, der es erlaubt, äquivariante Garben als bestimmte Konfigurationen von Vektorräumen darzustellen. Im zweiten Teil werden homologische Eigenschaften einer bestimmten Klasse von äquivarianten Garben, nämlich reflexiven äquivarianten Garben, untersucht. Es werden mehrere Typen von Auflösungen für diese Garben konstruiert, die ausschließlich von der Konfiguration ihrer assoziierten Vektorräume abhängen. Auf diese Art wird die Frage nach der kombinatorischen Darstellbarkeit teilweise positiv beantwortet. Als Spezialfall wird eine neue Methode zur Berechnung minimaler Auflösungen von Z^n-graduierten Moduln über Polynomringen entwickelt. Im dritten Teil wird eine vollständige Klassifikation der einfachsten nichttrivialen äquivarianten Garben, nämlich Vektorbündel vom Rang zwei auf torischen Flächen, angegeben. Diese Klassifikation besteht aus einer kombinatorischen Charakterisierung dieser Bündel und der Konstruktion von Parameterräumen (Modulräumen), die nur von dieser Charakterisierung abhängen. In Anhängen wird ein Ausblick gegeben über den Zusammenhang zwischen äquivarianten Garben, ihrer kombinatorischen Klassifikation und äquivarianten Chernklassen, wobei insbesondere auf die projektive Ebene eingegangen wird. Eine Klassifikation von äquivarianten Vektorbündeln vom Rang drei auf der projektiven Ebene wird angegeben
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
The RAWAM : relfun-adapted WAM emulation in C
Get PDFThis work describes the C implementation of the Relfun-Adapted WAM (RAWAM). The RAWAM is an abstract machine tailored to the relational-functional language Relfun, designed and implemented on the basis of the Warren Abstract Machine (WAM). Its goal is to replace an older LISP-implemented Relfun WAM by delivering comparable functionality at higher speed. The RAWAM implementation is introduced by reference to Hassan Ai:tKaci\u27s book "Warren\u27s Abstract Machine: A Tutorial Reconstruction\u27;and the present work will emphasize the differences and extensions w.r.t. this book. These include an assembler, an optimizer, a rudimentary module system, a more flexible realization of the standard WAM memory layout, as well as Relfun-specific extensions for functional and relational builtins, sorts, generalised indexing, and a simple higher-order facility. The implementation of the RAWAM will be described in terms of pseudo code and schematic patterns for the data structures. A relational-functional benchmark revealed a speed-up factor of 20-30 of the RAWAM compared to the older WAM
GeneTS : a relational-functional genetic algorithm for the traveling salesman problem
Get PDFThis work demonstrates a use of the relational-functional language RelFun for specifying and implementing genetic algorithms. Informal descriptions of the traveling salesman problem and a solution strategy are given. From these a running RelFun application is developed, whose most important parts are presented. This application achieves good approximations to traveling salesman problems by using a genetic algorithm variant with particularly tailored data representations. The feasibility of implementing sizable applications in RelFun is discussed
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
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