1,720,960 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
End-tidal arterial CO2 partial pressure gradient in patients with severe hypercapnia undergoing noninvasive ventilation
No full textDiaphragmatic motility assessment in COPD exacerbation, early detection of Non-Invasive Mechanical Ventilation failure: a pilot study
No full textBackground
Patients with respiratory failure due to Chronic Obstructive Pulmonary Disease (COPD) have decreased diaphragmatic mobility [1]. Non Invasive Mechanical Ventilation (NIMV) is a cornerstone in COPD exacerbation therapy. The availability of early predictors of NIMV failure may be helpful to guide decision-making. Only pH, respiratory rate and PaO2/FiO2 have been considered predictors of response to NIMV [2]. Ultrasonographic (US) assessment of diaphragmatic kinetic is a fast, reliable and reproducible method [3], but its predictive value on NIMV success is not known.Objective:Primary endpoint was to evaluate if the diaphragmatic excursion measurement was able to predict a longer weaning time. Secondary endpoint was to find out a cut-off value of diaphragmatic excursion and a weaning time interval able to predict worst outcome. Methods: Fifty-two (39 males, aged 71±7 years) Caucasian patients with COPD exacerbation treated with NIMV were enrolled. Diaphragm motility was assessed by ultrasonography before starting ventilation at 6 and 24 hours and at the weaning from NIMV. The diaphragmatic excursion (centimeters); the inspiratory and expiratory times (seconds); the inspiration and expiration velocity (cm/sec), the breathing period (seconds), the diaphragm motion time (seconds) and the diaphragm resting time (seconds) were evaluated. Results: Forty-five patients completed the study. The mean time on NIMV was 4.11 ± 1.07 days, with a total time of ventilation of 32.6 ± 86 hours. All the ultrasound diaphragm motility parameters, except for inspiration and expiration velocity, significantly improved at the weaning. Diaphragm excursion at the baseline was significantly correlated with pH (r=0.458; p=0.002), PaO2/FiO2 (r=0.567; p<0.001), and weaning time (r=0.774; p<0.0001). In a multiple linear regression analysis only diaphragm excursion was significantly associated with longer weaning time (coefficient of estimated model -9.247; Standard Error 3.101; p=0.003). ROC curve with weaning time longer than 36 hours was considered as positive state. The AUC value was 0.912 (Standard Error 0.015, p<0.001). The higher sensitivity rate (100%) was achieved with a specificity rate of 86.7% and a cut-off value of 3.165 cm, therefore patients with an excursion lower than 3.165 cm should be weaned after at least 36 hours, while patients with an excursion higher than 3.165 cm could be weaned within 36 hours. Conclusion: US measurements of diaphragmatic performance may have a role in the early evaluation of exacerbation of COPD and in predicting the response to NIMV therapy, it should be included as a routine test in patients presenting to ED with ECOPD
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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