1,720,961 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Laparoscopic splenectomy: Ligasure versus EndoGIA: A comparative study
No full textBackground: Laparoscopic splenectomy (LS) is considered the gold standard for the treatment ofhematologic disease of the spleen. Intraoperative bleeding is the main complication and main causeof conversion during LS. In this paper, we present our experience with 112 LS procedures, com-paring two different techniques and instruments for spleen dissection and hilar vascular control.Methods: We have performed a total of 112 LS procedures in 9 years in two affiliated universityhospitals. There were 48 males and 64 females (median age, 32.8 years). Indications were as follows:idiopathic thrombocytopenic purpura (ITP) in 42 patients, hereditary spherocitosis in 28, 6 with -talassemia, 1 with hemolitic anemia, 27 with lymphoma, 2 with leukemia, 3 with splenic cysts, and3 PPT cases. Associated procedures were present in 25 cases (17 cholecystectomy and 4 liver/lym-phnodal biopsies lysis of adhesions). Patients were divided in two groups according to the methodof dissection and hilar section (group 1, endostapler monopolar coagulation with 38 patients;group 2, the LigasureTM Vessel Sealing System (Valleylab, Boulder, CO) with 74 patients).Results: Groups were well matched according to age, indications, spleen sizes, and procedures as-sociated. Conversion rates (10 cases, 9%; 5 in each group), postoperative hospital stay (median 4days in each group), and intra- and postoperative complications were similar in the 2 groups with-out any mortality in each group, while intraoperative blood loss (loss of 100 mL in 55 patients ingroup 2, 78%; and in 21 patients in group 1, 52%), transfusion rates (8 patients in group 1 versus4 patients in group 2), and operative mean time (150 minutes in group 1 versus 125 minutes in group2) were minor in the Ligasure Vessel Sealing System group, with a statistical significance.Conclusions: The approach to spleen dissection and hilum section was safe and efficacy in eachcase, otherwise the use of Ligasure results in a gain of time. Furthermore the average intraopera-tive bleeding and average transfusion rates of this series were lower in group 2
Sutureless and stapleless laparoscopic splenectmy with radiofrequency
No full textResults of laparoscopic splenectomy usoing radiofrequency devic
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Different methods of dissection durino laparoscopic splenectomy
No full textBackground: Laparoscopic splenectomy (LS) is considered the gold standard for the treatment of hematologic disease of the spleen. Intraoperative bleeding is the main complication and main cause of conversion during laparoscopic splenectomy. Splenic and hilar dissection are sometimes difficult and different technologies have been applied to achieve it. We here present our experience with 110 LS using two different instruments for spleen dissection and hilar vascular control .
Methods: We have performed a total of 110 LS in nine years period in two affiliated University Hospitals. There were 50 males and 60 females (median age 34 yrs) and we employed a 4 trocars technique with right semilateral position. Indications were as follows: 41 thrombocytopenic idiopatic purpura (ITP), 30 hereditary spherocytosis, 9 talassemia, 25 Limphoma, 2 leukemia and 3 splenic cysts. Associated procedure were present in 32 cases (28 cholecystectomy and four liver/lymphnodal biopsies). Patients were divided in two group according with method of dissection and hilar section (group 1 Endostapler + electrocoagulation 40 pts; group 2 Ligasure vessel sealing system 70 pts).
Results: Groups were well matched according to age, indications, spleen sizes, procedures associated. Conversion rates (10 cases, 9%, five in each group), postoperative hospital stay (median 4 days in each group), intra and postoperative complications were similar in the 2 groups (with no statistically difference) without mortality in each group, while intraoperative blood loss (less of 100 ml in 55 patient of group 2, 78%, and in 21 of group 1, 52%), transfusion rates (8 pts in group 1 versus 4 in group 2) and operative mean time (150 min in group 1 versus 125 min in group 2) were less in the Ligasure vessel sealing device group(with a statistical significance).
Conclusions: The approach to spleen dissection and hilum section was safe and efficacy in each case otherwise the use of LigasureTM results in a gain of time. Furthermore the average intraoperative bleeding and average transfusion rates of this series is lower in group 2
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