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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
UTILITA' DELLA BIOPSIA MIRATA MEDIANTE T.A.C. NELLE RECIDIVE PERINEALI DEGLI OPERATI DI AMPUTAZIONE DI RETTO SECONDO MILES
No full textPercutaneous sclerotherapy with gelified ethanol of low-flow vascular malformations of the head and neck region: Preliminary results
Full text linkPURPOSE We aimed to evaluate the safety and effectiveness of percutaneous sclerotherapy using gelified ethanol in patients with low-flow malformations (LFMs). METHODS A retrospective study was performed, analyzing treatment and outcome data of 6 patients that presented with 7 LFMs (3 lymphatic and 3 venous). Median diameter of LFMs was 6 cm (inter-quartile range [IQR], 4.5–8.5 cm). Data regarding pain, functional and/or cosmetic issues were assessed. Diagnosis was performed clinically and confirmed by Doppler ultrasound, while extension of disease was assessed by magnetic resonance imaging (MRI). Percutaneous puncture was performed with 23G needle directly or with ultrasound guidance. All the LFMs were treated with gelified ethanol injection. The median volume injected per treatment session was 4.4 mL. RESULTS Technical and clinical success were obtained in all cases. No recurrences were recorded during a median follow up of 17 months (IQR, 12–19 months). Among the 6 patients, 5 had complete relief (83%) and one showed improvement of symptoms. The median VAS score was 7 (IQR, 6–7.5) before and 0 (IQR, 0–0) after treatment. All patients had functional and esthetic improvement (100%). Four patients (66.7%) revealed very good acceptance and two patients (33.3%) good acceptance. No major complications or systemic side effects were observed. CONCLUSION Gelified ethanol percutaneous sclerotherapy was easy to handle, well-tolerated, safe and effective in the short-term follow-up. Longer follow-up of efficacy is mandatory for further conclusions
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
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