1,721,061 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
Ultrasound findings in retroperitoneal lymphangiomyomatosis.
No full textA 44-year old female patient with pulmonary lymphangiomyomatosis was examined by standard abdominal sonography. A wide involvement of the retroperitoneal lymph nodes and vessels was found. The relevant sonographic features were enlarged lymph nodes, and multiple anechoic structures, irregular in shape, thin-walled, with intraluminal septa. The findings, which resembled active cysts or liquid-filled bowels, were diagnosed as multiple ectasic lymphatic vessels
A new micro‐forceps for endoscopic ultrasound‐guided through‐the‐needle biopsy in the diagnosis of pancreatic cystic lesions: Single center experience
Full text linkAbstract Background and Aim Endoscopic ultrasound (EUS)‐guided through‐the‐needle biopsy (TTNB) has improved the diagnostic algorithm of pancreatic cystic neoplasms (PCNs). Recently, a new through‐the‐needle micro‐forceps device (Micro Bite, MTW Endoskopie Manufakture) has been introduced. The primary aim was to assess the safety and technical success of this new type of micro‐forceps. The secondary aim was to evaluate the diagnostic role of EUS‐TTNB. Methods Retrospective study of consecutive patients receiving EUS‐TTNB for the diagnosis of PCNs. Two micro‐forceps were used: Moray Micro‐forceps and Micro‐Bite. Cystic fluid was collected for cytological analysis. Categorical variables were analyzed by Fisher's exact test, and continuous variables were analyzed by Student's t‐test. P < 0.05 was considered significant. Results Forty‐nine patients enrolled in the study (24% male; mean age 63 ± 14 years). TTNB was successfully performed in all patients. A diagnostic sample was obtained in 67.3% PCNs with TTNB compared with 36.7% with cyst fluid cytology (P 0.01). Adverse events rate was 10.2% and occurred in older patients (76.6 ± 5.4 vs 61.3 ± 13.7 P = 0.02). The 51% underwent EUS‐TTNB with Micro Bite. A diagnostic sample was obtained in 52% PCNs with Micro Bite compared with 24% obtained with cyst fluid cytology (P = 0.07). Comparing the two devices, the rate of diagnostic sample obtained with the micro‐forceps Moray was higher than that obtained with the Micro Bite (20/24 [83.3%] vs 13/25 [52%] P 0.03). Conclusions EUS‐TTNB increases the diagnostic yield of PCNs. The new Micro‐Bite could represent a valid alternative to the currently used Moray Micro‐forceps, but its diagnostic rate is still suboptimal and further studies are needed
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
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