1,720,966 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
Kesik Zamanlı Allee Etkili bir Av-Avcı Modelinin Kararlılığı ve Flip Çatallanması
No full textBu makalede, Allee etkilikesik zamanlı bir av-avcı modeli ele alındı. Modelin dinamik davranışlarıincelendi. Modelin her iki türün bir arada olduğu denge noktasının varlığı vekararlılık şartları elde edildi. Çatallanma teorisi kullanılarak, modelin flipçatallanmaya gittiği gösterildi. Elde edilen teorik sonuçların doğruluğunugöstermek için nümerik gösterimlere yer verildi.39A33, 37G35, 39A30
Neimark–Sacker bifurcation and stability analysis of a discrete-time prey–predator model with Allee effect in prey
No full textAbstract In this paper, the dynamical behaviors of a discrete-time prey–predator model with Allee effect on the prey population are investigated. The existence and topological classification of the fixed points of the model are analyzed. It is shown that the model can undergo a Neimark–Sacker bifurcation at the unique positive fixed point by choosing a as a bifurcation parameter. The conditions of the existence for Neimark–Sacker bifurcation and the direction of bifurcation via bifurcation theory are presented. Also, some numerical simulations are presented to support of the analytical finding. Then bifurcation diagrams and phase portraits of the model are given
The Local Stability Analysis of a Nonlinear Discrete-Time Population Model with Delay and Allee Effect
No full textInthis work, we present a delay general nonlinear discrete-time population modelwith and without Allee effects which occur at low population density. Weinvestigated local stability conditions of equilibrium point of both models andwe compared the local stability of the same equilibrium point of these twomodels. Obtained all theoretical results were supported by numericalsimulations
Travelling Wave Solutions of the Perturbed Wadati-Segur-Ablowitz Equation by (G'/G)-Expansion Method
No full textThe investigation of the exact solutions of NLPDEs plays an im-
portant role for the understanding of most nonlinear physical phenomena.
Also, the exact solutions of this equations aid the numerical solvers to assess
the correctness of their results. In this paper, (G'/G)-expansion method is pre-
sented to construct exact solutions of the Perturbed Wadati-Segur-Ablowitz
equation. Obtained the exact solutions are expressed by the hyperbolic, the
trigonometric and the rational functions. All calculations have been made with
the aid of Maple program. It is shown that the proposed algorithm is elemen-
tary, e¤ective and has been used for many PDEs in mathematical physics.
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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
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