1,720,960 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
Basosquamous cell carcinoma : a survey of 76 patients and a comparative analysis of basal cell carcinomas and squamous cell carcinomas
No full textBasosquamous carcinoma (BSC) is a rare epithelial tumor with a still confusing terminology. Since 2005 a more comprehensive and broader classification has existed. To retrospectively review our cases of BSC according to the new WHO definition and to re-evaluate their clinical and demographic characteristics and the margin involvement after traditional surgical excision. The data were compared with the same results obtained by basal cell carcinomas (BCCs) and squamous cell carcinomas (SCCs). Histologically confirmed carcinomas observed in our Department during a sixteen-year period (1994-2011) were studied. Surgical excision was evaluated following the international guidelines. Histopathologic subtypes of BSC were classified in accordance with accepted criteria. Seventy-six patients had a BSC, 305 a SCC, 3,643 a BCC. There were significant differences among the median age of BSCs, the total BCCs and Non-Aggressive BCCs (74.7, 68.8 and 68.3 years respectively; p<0.05). BSC was more significantly located on head-neck region than Non-Aggressive BCC (p<0.04), and less on trunk than Mixed Histology BCC (p<0.01) and Non-Aggressive BCC (p<0.005). BSC has higher prevalence of positive margins after excision than total (p<0.03) and Non-Aggressive BCC (p<0.001). Basosquamous carcinoma fits to a tumor type with a different behavior pattern from non-aggressive basal cell carcinoma and more similar to squamous cell carcinoma or aggressive variants of basal cell carcinoma. Its infiltrative growth and the stromal reaction patterns give enough evidence to support the notion of considering basosquamous carcinoma as a relatively aggressive tumor
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
Margin involvement and clinical pattern of basal cell carcinoma with mixed histology
No full textBACKGROUND: Mixed basal cell carcinoma (BCC) has not been sufficiently and specifically studied.
OBJECTIVE: The aim of this study was to estimate in adults the prevalence of mixed cases observed among primary BCCs and to compare clinical and anatomical features of mixed vs. single BCCs, with focus on the incomplete excision.
PATIENTS AND METHODS: A total of 3636 histologically confirmed primary BCCs were examined. Data on gender, age, histological subtype, anatomical location and margin involvement were collected. Mixed type was defined as a combination of two or more single subtypes.
RESULTS: Prevalence of single and mixed BCCs was 82.2% and 17.8% respectively. Prevalence of BCCs on the upper limbs was higher in mixed than single cases (8.8% vs. 4.0%; P<0.001) while prevalence on the back was lower (16.9% vs. 23.7%; P<0.001). Tumour was aggressive in 59.1% of mixed vs. 16.0% of single BCCs (P<0.001). Margin involvement was more prevalent in mixed than in single BCCs (16.7% vs. 9.6%; P<0.0001). At multivariate analysis being mixed vs. single BCC was associated with aggressiveness of tumour (OR=8.5, 95% CI, 6.9-10.4), lateral margin involvement (OR=1.98, 95% CI, 1.42-2.76) and subject being man (OR=1.31, 95% CI, 1.10-1.60) but not with deep involvement of margin or anatomical location.
CONCLUSION: Among BCCs, the mixed type may be observed in adults with relatively high rate and may represent a complex and individual subset of BCCs with potential aggressive behaviour
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
- …
