1,720,992 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
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
[Progress in the diagnosis of unknown primary neoplasms].
No full textAbout 5% of tumours clinically begin as unknown origin metastases involving some difficult diagnostic and therapeutic problems. In these cases the main goal is the formulation of the diagnosis as rapidly as possible because only about 10-15% of diagnosed patients are susceptible of treatment. Between 1973-1989 we observed 59 patients with unknown origin metastases. The diagnosis has been expressed in 5 patients by means of histochemical and immunohistochemical analysis, in 6 patients by means of radiologic and instrumental tests and in 3 patients spontaneously after 2-3 months
IPERTIROIDISMO E CANCRO DELLA TIROIDE
No full textThe relationship between hyperthyroidism due to Graves' disease or toxic nodular goiters and carcinoma of the thyroid remains uncertain. The incidence of thyroid carcinoma varies considerably from as low as 0.3% to as high as 16.6% with a higher rate in toxic nodular goiters than in diffuse goiters and in endemic goiter areas or after external radiation to head and neck. Occult thyroid carcinoma ( < 1.5 cm or microscopic foci) is the rule and only a few tumors are suspected preoperatively with ultrasonography or fine needle aspiration or 131I scan. Authors studied 11 patients found to have thyroid cancer concomitant with Graves' disease (2 patients) or toxic nodular goiter (9 patients) between 1979 and 1991 at University of Cagliari, Department of Surgical Oncology. Eight of the 11 cancers were papillary while three were follicular. A carcinoma was diagnosed intraoperatively on frozen section in only two patients, while on permanent section in nine patients. Two patients received subtotal thyroidectomy, because resection edges were safe and tumors were small. Nine patients received total thyroidectomy and three also lymphoadenectomy. All patients were alive and well with a mean follow-up of 91.8 months. The authors conclude that the incidence of coexisting thyroid malignancy and hyperthyroidism is rare, does not affect prognosis and is unimportant for therapeutic purposes because, currently, toxic nodular goiter, Graves' disease and carcinoma are treated by total thyroidectomy
Hyperthyroidism and thyroid cancer
No full textThe relationship between hyperthyroidism due to Graves' disease or toxic nodular goiters and carcinoma of the thyroid remains uncertain. The incidence of thyroid carcinoma varies considerably from as low as 0.3% to as high as 16.6% with a higher rate in toxic nodular goiters than in diffuse goiters and in endemic goiter areas or after external radiation to head and neck. Occult thyroid carcinoma (< 1,5 cm or microscopic foci) is the rule and only a few tumors are suspected preoperatively with ultrasonography or fine needle aspiration or 131I scan. Authors studied 11 patients found to have thyroid cancer concomitant with Graves' disease (2 patients) or toxic nodular goiter (9 patients) between 1979 and 1991 at University of Cagliari, Department of Surgical Oncology. Eight of the 11 cancers were papillary while three were follicular. A carcinoma was diagnosed intraoperatively on frozen section in only two patients, while on permanent section in nine patients. Two patients received subtotal thyroidectomy, because resection edges were safe and tumors were small. Nine patients received total thyroidectomy and three also lymphoadenectomy. All patients were alive and well with a mean follow-up of 91.8 months. The authors conclude that the incidence of coexisting thyroid malignancy and hyperthyroidism is rare, does not affect prognosis and is unimportant for therapeutic purposes because, currently, toxic nodular goiter, Graves' disease and carcinoma are treated by total thyroidectomy
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