1,720,959 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
Homogenization of nondivergence-form elliptic equations with discontinuous coefficients and finite element approximation of the homogenized problem
Full text linkWe study the homogenization of the equation
posed in a bounded
convex domain subject to a Dirichlet boundary
condition and the numerical approximation of the corresponding homogenized
problem, where the measurable, uniformly elliptic, periodic and symmetric
diffusion matrix is merely assumed to be essentially bounded and (if )
to satisfy the Cordes condition. In the first part, we show existence and
uniqueness of an invariant measure by reducing to a Lax--Milgram-type problem,
we obtain -bounds for periodic problems in double-divergence-form, we
prove homogenization under minimal regularity assumptions, and we generalize
known corrector bounds and results on optimal convergence rates from the
classical case of H\"{o}lder continuous coefficients to the present case. In
the second part, we suggest and rigorously analyze an approximation scheme for
the effective coefficient matrix and the solution to the homogenized problem
based on a finite element method for the approximation of the invariant
measure, and we demonstrate the performance of the scheme through numerical
experiments.Comment: 19 page
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
Finite element approximation of elliptic homogenization problems in nondivergence-form
Full text linkThis thesis focuses on the construction of finite element numerical homogenization schemes for both linear and selected fully-nonlinear elliptic partial differential equations in nondivergence-form.
In the first part of the thesis, we study periodic homogenization problems of the form A(x/ε):D2 uε = f subject to a homogeneous Dirichlet boundary condition. We provide a qualitative W2,p theory and obtain optimal gradient and Hessian bounds with correction terms taken into account in the Lp-norm. Consequently, we find that (uε)ε>0 converges strongly in the W1,p-norm to the solution of the corresponding effective problem, and that the optimal rate for this convergence is O(ε). Based on these quantitative homogenization results, we propose and rigorously analyze a finite element-type numerical homogenization scheme for the approximation of the solution to the effective problem and the solution uε to the original problem in the H1 and H2 Sobolev-norms. We extend the scheme to the framework of nonuniformly oscillating coefficients and provide a variety of numerical experiments illustrating the theoretical results.
In the second part of the thesis, we propose and rigorously analyze numerical homogenization schemes for the fully-nonlinear Hamilton--Jacobi--Bellman (HJB) and HJB--Isaacs (HJBI) equations. More precisely, we are interested in the approximation of the effective Hamiltonian which determines the effective equation. Our numerical schemes are based on finite element approximations for suitable corrector problems arising in the periodic homogenization of these equations. We present a mixed finite element scheme as well as discontinuous Galerkin and C0 interior penalty finite element approaches. Several numerical experiments accompany the theoretical results and illustrate the performance of the numerical schemes
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
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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