1,721,040 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
LIVER RESECTION IN HEPATOCELLULAR CARCINOMA: OUTCOME, LONG-TERM RESULTS, AND PROGNOSTIC FACTORS
No full textThe purpose of this study, based on data prospectively collected, was to evaluate prognostic factors that influence outcome and long-term survival of liver resection for HCC. From September 1989 to March 2004, 124 consecutive patients had liver resection for HCC at our department. 94 patients belonged to Child-Pugh class A, 26 (20.9%) to class B. and 4 to class C. (3.2%). We performed 53 major liver resections (right hepatectomy, left hepatectomy, trisegmentectomy) and 71 limited resections (segmentectomy, wedge). In-hospital mortal- ity rate was 8.1%, morbidity rate was 48.3%, caused by the rising ofascites (10%), hepatic insufficiency (19%), biliary fistula (6%), hepatic abscess (25%), hemoperitoneum (10%) and pleural effusion (30%). At preoperative evaluation 81 lesions were unifocal, tumor size measured before resection was over 5 cm in 61% of the cases. The preservation of 1 cm or greater tumor free margins has obtained in 77% of cases, and the histopathological examination revealed the presence of a capsule in 68.5% of lesions. Cumulative 1-, 3-, 5-, and 7-year survival rate were 73.7%, 44.2%, 22.8%, and 12.9%. The prognostic factors correlated with overall survival were lesion diameter (5 cm vs. 5 cm, P 0.01), number of lesions (1 vs. 1, P 0.01), the presence of a capsule (P 0.05), Child-Pugh class (A vs. B. and C, P 0.05), Pringle’s maneuver time (20’ vs. 20’, P 0.05), type of resection (limited vs. major, P 0.05), postoperative complications (P 0.05), Oka- moto-Child Index (20% vs. 20%, P 0.01), and relapse of HCC (P 0.05). Liver resection is still the best practice against hepatocellular carcinoma. Surgical procedure should be encouraged in case of single lesion, diameter 5 cm, in patients of Child-Pugh class A, when the lesion is encapsulated and the surgical procedure could be limited rather than major Figure 1 shows cumulative survival: the influence of lesion’s diameter on survival, and Figure 2 shows cumulative sur- vival: the influence of postoperative complications on survival
Stromal tumor of the gastrointestinal tract: a report of 4 cases and a review of the literature
No full textBackground
Gastrointestinal tumors (GISTs) belong to a group of rare neo- plasms of the gastrointestinal tract, generally not recognized as dis- tinct pathological entities until recently. The only treatment for lo- cal disease has been radical surgical resection. No adjuvant therapy has proven effective.
Purpose
The purpose of the study was to establish distinct pathological entities among GISTs using new immunohistochemical markers and to determine the feasibility of other therapeutic options as an alternative to surgery.
Methods
In all cases in which a diagnosis of GIST was made, immuno- histochemical examination of the tumor was carried out. In patients undergoing surgery the lesion was localized. Treatment consisted of radical resection.
Results
There was no evidence of recurrence of disease following surgery. Consequently, no pharmacological therapy or adjuvant ra- diotherapy was deemed necessary.
Conclusions
GISTs comprise biologically distinct tumors. Treatment of local lesions consists of radical resection. Nevertheless, good results us- ing specific molecular therapy in advanced forms of disease have been reported in the literature
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
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