1,720,968 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
Impact of high titre of antiphospholipid antibodies on postoperative outcome following pulmonary endarterectomy.
No full textOBJECTIVES: Antiphospholipid (a-PL) antibodies, especially IgG isotype, have been associated with a variety of neurological manifestations related to thrombotic mechanism and reactivity against nervous tissues. Furthermore, high titre of a-PL antibodies has been also correlated to chronic thromboembolic pulmonary hypertension (CTEPH) and, therefore, is frequently reported in patients undergoing pulmonary endarterectomy (PEA). The impact of a-PL antibodies in postoperative outcome following PEA, however, has not been clearly evaluated yet. In this paper, we investigated the impact of a high a-PL IgG titre (HAPT) on postoperative outcome following PEA. METHODS: From April 1994 to October 2008, out of 204 patients undergoing PEA at our centre, 184 were prospectively screened for a-PL antibodies. According to the preoperative IgG titre, patients were divided into two groups: Group A (high a-PL antibodies titre - HAPT) with a-PL IgG titre >10 U/ml and Group B (low a-PL antibodies titre - LAPT) with a-PL IgG titre <or=10 U/ml. Early outcomes were compared between the two groups. RESULTS: Twenty-eight patients (15%) were included in Group A, whereas 156 (85%) patients were included in Group B. HAPT influenced preoperative parameters as patients of Group A were younger compared to those of Group B (42+/-16 and 52+/-16 for Group A and B, respectively, P=0.001) and presented more frequently a previous history of deep venous thrombosis (DVT) (96% and 62% for Group A and B, respectively, P=0.001). The two groups were homogeneous for all other operative parameters. As far as postoperative outcome, in terms of mortality and major complications, there were no differences between the two groups. Incidence of transient neurological complications, however, was significantly different (32% and 10% for Group A and B, respectively, P=0.023). CONCLUSIONS: The presence of high titre of IgG isotype a-PL antibodies significantly influences preoperative characteristics of patients undergoing PEA. Furthermore, despite that no significant differences were shown in major end points, the presence of high titre of a-PL did interfere with postoperative course as caused by an increased rate of minor and transient neurological impairment (TNI). An accurate monitoring especially during hypothermic circulatory arrest (CA) period seems, therefore, mandatory in this subgroup of patients undergoing PEA
Pulmonary endarterectomy: the lancet first, tears for pills.
No full textChronic thromboembolic pulmonary hypertension (CTEPH) is a progressive disease due to the incomplete resolution of pulmonary emboli, leading to right heart failure, with a poor survival. Pulmonary endarterectomy (PEA) is the operation of choice for CTEPH. As there are no well-defined criteria to discriminate surgically accessible from inaccessible obstructive lesions, the operability assessment relies on the surgeon's experience. The recommended algorithms to perform a correct diagnosis of CTEPH still suggest the lung ventilation/perfusion scan, despite advances in computed tomography with 3-D reconstruction and magnetic resonance imaging. Selective pulmonary angiography is the gold standard to assess operability in CTEPH. Medical therapy should not be considered an alternative to PEA, as it should be reserved to patients with either peripheral disease, deemed inoperable by an experienced PEA surgeon, or persistent/recurrent pulmonary hypertension after PEA. Lung transplantation, when indicated, still represents a viable option for patients with either inoperable CTEPH or CTEPH with concomitant severe parenchymal lung disease that contraindicates PEA. The outcome of operable CTEPH is still best predicted after surgery. Remarkably, the recovery of exercise capacity is not as immediate as hemodynamic improvement, underlining the importance of early identification of surgical candidates before physical deconditioning
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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