1,720,974 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
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
Overview of the Building of a Gene Cluster and Phylogenetic Tree Shown by a Hypothetical Example
No full text<div><p>(A) Each circle represents a gene, labeled with the source genome according to the first letter of each taxon—C, M, H, and F for <i>Ciona,</i> mouse, human, and fugu, respectively—and further differentiated by numeral. BLASTP was first used to search all vertebrate genes for the one most similar to <i>Ciona'</i>s <i>C1</i> gene, in this case the mouse gene <i>M1.</i> Then other genes are recruited to the cluster if they have a higher similarity score to <i>M1</i> that that between <i>C1</i> and <i>M1,</i> indicated here by the red lines. The six genes shown on the right side of the diagram have some sequence similarity to those in the cluster, but less than that between <i>C1</i> and <i>M1,</i> so are not included. Because the vertebrates are more closely related to each other than any is to <i>Ciona,</i> each cluster will include those genes descended from a single gene in the common chordate ancestor, having arisen by either lineage splitting or gene duplication specific to one or more vertebrates. (See <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0030314#s4" target="_blank">Materials and Methods</a> for more details.)</p>
<p>(B) Evolutionary tree of the genes in this cluster show separate duplications for fugu and for human. Because the maximum likelihood method does not rely solely on sequence similarity, there is no significance to the mouse gene being most similar to <i>C1.</i> The mouse genome simply contained the most slowly evolving vertebrate gene in this multigene family; this can be from any vertebrate taxon with approximately equal likelihood.</p></div
Phylogenetic Analysis of the Four Chordates with <i>Drosophila</i> as an Outgroup
No full text<p>This phylogenetic tree is based on 766 concatenated single copy protein sequences totaling 313,797 amino acid positions with branches proportional to the amount of change. Numerals in bold above the branches indicate the number of gene duplications occurring in each lineage; numerals below indicate branch lengths.</p
Histogram Showing the Lower Bound Estimate of <i>N-</i>fold Redundancy Using the Analysis Reported in Figure 5
No full text<p>This histogram is generated by counting the depth of paralogon redundancy across all human chromosomes as shown in the lower part of <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0030314#sg002" target="_blank">Figure S2</a> (and subsampled for <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0030314#pbio-0030314-g005" target="_blank">Figure 5</a>). The peak at 4-fold coverage is consistent with the 2R hypothesis, and constitutes a lower bound estimate, because the sliding window examines only a small span of flanking genes and would be highly subject to effects of local gene rearrangements.</p
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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