1,720,973 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
Non invasive assessment of physiopathologic events during methacholine inhaled test in asthmatics
No full textRespiratory and pulmonary vascular modifications induced by methacholine inhaled challenge in 20 asthmatic outpatients were studied non invasively by means of echo-Doppler. Eight healthy volunteers were studied as a control group. A significant reduction in oxemia (-22 mmHg) as a hyperreactive marker (PD15O2) was observed in asthmatics and it was strictly related to PD20FEV1(r = 0.82 and p < 0.005). Again in asthmatics we observed a significant increase in sPAP (from 27±2 to 39±9 mmHg) evaluated by means of echo-Doppler: This variation was time related to hypoxic phase. Hypoxemia lasted 9±5 minutes but neither this index nor the basal lung function or the methacholine challenge results were related to the echo-Doppler measurements which were useful for evaluating the pulmonary vascular response. Finally our study suggests that: a) a significant decrease in oxemia was strictly related to the bronchial response in asthmatics; b) a transient increase in sPAP was present and time related to hypoxia only asthmatics; C) the lack of relationship among vascular and bronchial response was probably due to different distribution of ventilatory and vascular reflexes in each subject
TIOTROPIUM AND EXERCISE TRAINING IN COPD PATIENTS: EFFECTS ON DYSPNEA AND EXERCISE TOLERANCE
No full textLong-term tracheostomized COPD patients: Survival and timing for decannulation
No full textPurpose: The aim of this study was to describe: 1) - the long term survival of COPD patients ventilated for more than 21 days, trachostomized and successfully weaned from mechanical ventilation (MV) and 2) - the effect of decannulation. Methods: We studied 29 COPD patients with chronic respiratory insufficiency (21 M, mean age 65±12 years, FEV1 768±290 ml, PaO2 57±14, PaCO2 49±11 mmHg at FIO2=21%) who, after successful weaning from MV were discharged from our Respiratory Intermediate Intensive Care Unit with a tracheostomy. Lung spirometry and breathing pattern, maximal inspiratory pressure (MIP), arterial blood gases, clinical condition (signs, symptoms and no of hospital/days/pts), tracheal status (skin and mucosal conditions) and microbiological status (% of colonizated patients), were recorded at discharge (T0) and every 2 months during a mean follow-up of 6±2 months (range 2 to 12 m). Results: 17 out of 29 patients (58%) (Group 1) underwent cannula removal according to subjective physician's judgment after a mean time of 4.7±2.3 months; 12 out of 29 patients (42%) (Group 2) were maintained with the tracheostomy. At T0 Pseudomonas spp. colonisation was observed in 75% of group 1 and in 66% of group 2; Staphilococcus aureus occurred only in 20% of Group 2. No difference in the functional parameters were present at this time. At the end of follow up all the patients in both groups were alive. Among all the variables considered, only MIP and respiratory frequency showed a significant improvement (p<0.01) in both groups between T0 and values at the last available follow-up control. Hospital necessity in the follow up was higher in Group 2 than in Group 1 (16.1±9.8 and 8.8±7.9 days/pts respectively, p<0.001). Conclusions: These data may suggest that decannulation does not influence survival in COPD patients weaned from prolonged MV, but is associated to a reduced need of new hospital admissions
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
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