1,720,963 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
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
Il ruolo del pericranio nella prevenzione delle deiscenze post-operatorie e nella riduzione del riassorbimento osseo dopo ricostruzione di mascellari atrofici a scopo implantare con innesti ossei autologhi di apposizione
No full textObiettivi. Confrontare, in due gruppi di pazienti affetti da atrofia dei mascellari
edentuli, di cui uno sottoposto a ricostruzione con soli innesti autologhi di
apposizione mentre l’altro con innesti di apposizione ricoperti con lembi di
pericranio autologo: a) l’incidenza di deiscenze; b) il riassorbimento osseo prima
e dopo l’inserimento implantare; c) la sopravvivenza e il successo degli impianti
inseriti nelle zone ricostruite.
Materiali e metodi. 44 pazienti affetti da grave atrofia ossea sono stati
sottoposti a ricostruzione con innesti autologhi di apposizione verticale
prelevati dalla calvaria o dal ramo mandibolare. In 23 pazienti (gruppo studio)
gli innesti sono stati ricoperti con un lembo di pericranio, mentre in 21 soggetti
(gruppo controllo) non è stata effettuata alcuna ricopertura degli innesti. Dopo
un’attesa di 4-7 mesi sono stati inseriti 199 impianti nelle aree ricostruite (105 nel
gruppo studio, 94 nel gruppo controllo) e, successivamente, si è proceduto alla
riabilitazione protesica. Il follow-up medio dall’inizio del carico protesico è stato di
23,9 mesi (range: 12-48 mesi).
Risultati. L’incidenza delle deiscenze è stata del 5,7% nel gruppo studio e del 16%
nel gruppo controllo. Il riassorbimento medio pre-implantare nel gruppo studio
è stato 0,12 mm (DS ± 0,32) mentre nel gruppo controllo 0,98 mm (DS±2,79). Il
riassorbimento medio peri-implantare nel gruppo studio è stato 0,21 mm (DS ±
0,48), mentre nel gruppo controllo 0,43 mm (DS ± 0,83). La sopravvivenza degli
impianti inseriti nelle aree ricostruite è stata del 99,1% nel gruppo studio e del 100%
nel gruppo controllo, mentre il successo implantare è stato del 96,2% nel gruppo
studio e del 93,6% nel gruppo controllo.
Conclusioni. L’uso del pericranio sembra limitare il rischio di deiscenza
precoce dopo ricostruzione con innesti autologhi di creste alveolari atrofiche e il
riassorbimento osseo pre-implantare, mentre non sembra influenzare in modo
significativo il riassorbimento degli innesti prima dell’inserimento implantare
Cogan syndrome: confocal microscopy assessment of corneal damage
No full textPURPOSE: To perform in vivo assessment of corneal alterations in patients with Cogan syndrome (CS) and to correlate these findings with prior histopathologic descriptions.
METHODS: Four consecutive patients (8 eyes) presenting with typical CS underwent confocal microscopy examination. At the moment of evaluation, ocular inflammation was quiescent in all the patients. The images were studied singularly, and then compared to those obtained from 5 healthy controls. Statistical analysis was performed with Student t test.
RESULTS: All the cases showed multiple brightly reflective deposits in the stroma with moderate reflectivity of the surrounding stromal tissue. The outer corneal layers and the endothelium were spared. In 3/4 of the patients, the nerve fibers of the subepithelial plexus were thin and poorly reflective, with interruptions and lack of the typical branching pattern. No cells different from keratocytes could be detected in either case or control eyes. Corneal vascularization was present in one case. In CS-affected eyes, corneal thickness was 552+/-62 microm on average, and endothelial cell count was 2466+/-288 cells/mm(2). Statistical significance was not reached compared to the control group.
CONCLUSIONS: Confocal microscopy was able to provide detailed images of corneal alterations in CS. This confirmed the interstitial nature of the keratitis and showed an excellent accordance with prior histopathologic findings. The absence of inflammatory cell infiltration may be explained by the prolonged control of ocular inflammation in our patients, which may also have limited stimuli for corneal neovascularization
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