1,720,985 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
Early detection of focal cortical gyration anomalies : prenatal MRI
No full textObjectives: To highlight the magnetic resonance imaging (MRI)patterns of focal cortical gyration anomalies, as they appear at a very early stage of the sulcation process.
Methods: We reviewed 950 fetal MRI studies performed at our institution between 2000 and 2006. The cases showing focal anomalies of the cortical rim before the 25th week of gestation were selected and classified according to the type of cortical ribbon
distortion.
Results: Among nine selected cases, we identified three basic patterns of cortical rim anomaly: ‘wart-like’, ‘saw-tooth’ and major aberrant invaginating sulci. All anomalies were already detectable when the
brain was still smooth (‘physiological lyssencephaly’). The ‘wart-like’ and ‘saw-tooth’ patterns were confirmed to be focal polymicrogyria at follow-up. In one ‘wart-like’ case and in aberrant sulci cases the
anomaly became more complex along with the gyration process.
All cases were associated with additional brain anomalies: callosal partial agenesis, septum pellucidum agenesis, periventricular nodular heterotopias, focal thinning of migrating glia band and germinal matrix–ganglionic eminence hypertrophy. Five cases probably had a genetic basis, while the others were very probably of clastic origin.
Conclusions: The present cohort shows how focal cortical gyration anomalies can be detected even at a very early stage of the sulcation process. Moreover, it shows how polymicrogyria and aberrant sulci grow along with normal brain maturation. The detection of migrating cell focal alterations suggests a migratory defect playing a role in the genesis of some focal gyration anomalies
Prenatal magnetic resonance imaging of optic nerve head coloboma
No full textOBJECTIVE: Congenital optic nerve head coloboma represents an important cause of childhood visual impairment and blindness; it can be isolated or, more often, it can be associated with several syndromes. Ultrasound has limitations in depicting the posterior aspect of the fetal eye globe, so prenatal information about ocular coloboma are very scarce. The purpose of this paper was to report prenatal magnetic resonance (MR) imaging features of optic nerve head coloboma. METHODS: MR imaging at 1.5 Tesla was based on multiplanar single-shot fast spin-echo T2-weighted 3-4 mm thick contiguous sections. RESULTS: Three fetal cases with optic nerve head coloboma and one with microphthalmos and colobomatous cyst are reported. Coloboma appeared as a focal bulging of ocular globe profile at the insertion of optic nerve. CONCLUSION: Prenatal MR imaging allowed an accurate diagnosis to be obtained. Copyright (c) 2008 John Wiley & Sons, Ltd
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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