1,720,957 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
Central 10° automated perimetry and contrast sensitivity in patients suffering from exudative macilar degeneration before and after treatment with photodynamic therapy
No full textPurpose: Photodynamic therapy (PDT) has recently proved to be very effective in the management of exudative macular degeneration. The aim of this study was short–term evaluation (three and ten weeks) of visual function in patients with exudative macular degeneration subjected to PDT. Methods: 30 patients (12 male and 18 female) with an age range from 56 to 81 years (average age 73.4 +–9.86) were selected and enrolled in the study. The same day of PDT (time 0) the selected patients underwent white on white 10° computerized visual field (Humphrey 750 10/2 full threshold ) and contrast sensitivity examination at spatial frequencies of 2 C/°, 4 C/°, 6C/°, 12 C/° and 18 C/° (CCON (c) 1993–95 TwoDocs, Inc. Version 95). These tests were subsequently repeated after three and ten weeks from PDT. Fluorescein angiography was also carried out at time 0 and repeated after 10 weeks from PDT. Results: After ten weeks from PDT treatment, the mean contrast sensitivity was 60.16 ±17.68, whereas before therapy it was 44.80 ±12.60, with a significant difference of 15.36 dB (p<0.01) and a significance difference the medium–low spatial frequencies (p<0.05) . Mean Defect (MD) and Pattern Standard Deviation (PSD) and the value of the foveal threshold were considered in the visual field . MD and PSD before and after treatment were statistically significant in the tests carried out 3 weeks after PDT while in following test
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
Valutazione mediante metodiche psicofisiche di pazienti affetti da degenerazione maculare senile prima e dopo terapia fotodinamica
No full textObiettivi: studiare l’influenza della terapia fotodinamica con verte porfina mediante metodiche psicofisiche (sensibilità al contrasto ed esame del campo visivo computerizzato) in pazienti affetti da degenerazione maculare essudativa prevalentemente classica. Procedure di base: studio comparativo osservazionale eseguito su trenta occhi con membrane coroideali neovascolari secondarie a degenerazione maculare senile da trattare con terapia fotodinamica con verte porfina. I pazienti sono stati sottoposti ad esame dell’acuità visiva , esame fluorangiografico con fluoresceina, esame della sensibilità al contrasto ed esame del campo visivo computerizzato dei 10° centrali, sia prima della PDT sia a distanza di tre e dieci settimane dalla stessa. Risultati: dopo il trattamento con terapia fotodinamica si è ottenuto un aumento generale dei valori di contrasto,, in particolare dei valori alle frequenze spaziali medio-basse. A tre settimane dalla PDT tutti gli indici perimetrici considerati sonjo migliorati con una differenza statisticamente significativa, che non è stata però confermata a dieci settimane dal trattamento. Si è inoltre riscontrato che gli occhi nei quali la membrana neovascolare, in seguito al trattamento con PDT, è risultata ridotta nella dimensioni, risultano essere gli occhi con un miglioramento significativo dei valori dei test psicofisici, a dieci settimane dalla terapia, oltre ad aver mantenuto un’acuità visiva stabile nel tempo, al contrario degli occhi nei quali le membrane neovascolari sono rimaste invariate o ridotte nelle dimensioni. Conclusioni: la PDT può portare ad una stabilizzazione a breve termine dell’acuità visiva, ad un decremento di un rischio di una rilevante riduzione della sensibilità al contrasto e ad un miglioramento degli indici perimetrici in occhi affette da degenerazione maculare essudativa prevalentemente classica nei quali si è riscontrata una riduzione delle dimensioni fluorangiografiche delle membrane coroideali neovascolari. Ciò comporta un miglioramento della visione parafoveale (confortato dai risultati dei test per la sensibilità al contrasto e dagli indici perimetrici), con particolare soddisfazione da parte dei pazienti, che affrontano con più facilità tutte le attività giornaliere, grazie ad un globale miglioramento soggettivo delle condizioni visive
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