1,721,210 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
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
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
Predicting the rate of scour beneath subsea pipelines in marine sediments under steady flow conditions
No full textModel scale experiments of scour beneath a submarine pipeline, coupled with erosion testing, have been undertaken using two marine sediments and five artificial sediments having a wide range of grain size. The experiments reveal that for both the marine and artificial sediments the time scale of scour beneath the pipeline depends on the erosion properties of the sediment. For coarser sediments, mobilised mainly in transport along the bed, the rate of scour is found to agree well with the existing empirical formula of Fredsøe et al. (1992). In contrast, for finer sediments that are mobilised mainly through entrainment into suspension and can have relatively high erosion resistance, the rate of scour is different to that predicted using the same empirical formula. To explain this result, theoretical arguments are used to relate the rate of scour beneath a pipeline to the fundamental erosion properties of the sediment; namely the transport rate along the bed and the true erosion rate of the sediment. These arguments lead to two new empirical formulas that may be used to predict the time scale of the scour process beneath subsea pipelines. The first formula is appropriate when the sediment scours predominantly via transport of sediment along the bed, and is consistent with the empirical formula due to Fredsøe et al. (1992). The second formula is appropriate when sediment erodes mainly via entrainment into suspension, as is often the case for fine or 'cohesive' sediments. Collectively, the two formulas may be used in practice to make predictions of the rate of scour for pipelines in marine sediments and artificial sediments, provided erosion testing results are available.</p
Book review: The Account Book of the Giles Geast Charity, Tewkesbury, 1558-1891, edited by Daniel C. Beaver. Gloucestershire Record Series Vol. 31. ISBN: 9780900197932
No full textThis is the author accepted manuscript. The final version is available from the publisher via the link in this record
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