1,721,102 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
Role of mini-invasive surgery in the treatment of enteric duplications in paediatric age: a survey of 15 years.
No full textBackground Gastrointestinal tract duplications (ATD) are rare malformations that occur with an incidence of 1 in 4000-5000 live births, with heterogeneous clinical pictures in relation to the different location and size. The purpose of this study was to analyze the role of minimally invasive surgery in the management of ATDs, through a critical analysys of 15 years of experience of the Department of Paediatric Surgery, University of Bologna.
METHODS:
The medical records of 22 children diagnosed with ATDs were retrospectively reviewed (January 1995-August 2010). The study analyses: clinical presentation, preoperative diagnosis, site, anatomic type, treatment, and outcome.
RESULTS:
Children were 16 males and 6 females, with age ranged from 1 day to 10 years. 20 ATDs (91%) were cystic type, while 2 cases (9%) were tubular one. During the first period of our experience, 10 (45.5%) cases were approached with an open surgery. Then subsequent 8 (36.4%) cases were treated with a diagnostic laparoscopy. This approach permitted also to perform a minilaparotomy, close to the site of the malformation, with a short length of the scar. In 2 cases (9%), we realized an ileal resection with end-to-end anastomosis with a trans-umbilical video-assisted procedure. In 2 cases (9%), we performed a complete removal of the lesions, after complete ligation of the vascular pedicle through a laparoscopic approach. 10 cases (45.5%) were located in the ileum, 6 cases (27.3%) were esophageal duplication, 3 cases (13.6%) were gastric duplications, 2 cases (9%) were located in the colon-rectum. The postoperative course was uneventful in all the cases.
DISCUSSIONS AND CONCLUSIONS:
this study shows how, in the management of intestinal duplications, a mininvasive approach, is increasingly taking the field, along with increasing the "learning curve" with laparoscopy. In experienced hands, the laparoscopic approach allows an accurate definition of the exact site of duplication and a miniinvasive treatment with similar principles of open techniques
Approccio laparoscopico al nefroblastoma.
No full textIl tumore di Wilm è il tumore renale maligno più comune dell' infanzia. La resezione chirurgica è eseguita tradizionalmente attraverso un approccio laparotomico. L' avvento di tecniche laparoscopiche per lesioni renali benigne ha condotto ad applicare un approccio mininvasivo anche per i nefroblastomi. Come descritto in letteratura, diversi sono i benefici nell' utilizzo di un tale approccio: la magnificazione laparoscopica; l' efficiente e più pratica dissezione linfonodale; la facilità nel visualizzare ed asportare piccoli impianti tumorali, soprattutto nello scavo pelvico; il migliore decorso post-operatorio e la riduzione di occlusioni da briglie. Al contempo non si devono sottovalutare i rischi: manovre limitate dallo spazio ridotto; assenza di percezione tattile; possibilità di riportare metastasi a alivello delle inserzioni dei trocar. Raccomandazioni nell' esecuzione di tale procedura sono: fissare in maniera corretta i trocar; utilizzo imperativo di endo-bag e non rispermiarsi nell' incisione sovrapubica. Controindicazioni assolute sono: trombosi della vena cava o della renale; tumore che supera il margine laterale del corpo vertebrale adiacente; infiltrazione degli organi vicini
Functional Anatomy of the Pelvic Floor and the Anorectum
No full textFunctional Anatomy of the Pelvic Floor and the Anorectu
Posizionamento videoassistito di catetere per dialisi peritoneale: la nostra esperienza.
No full textIl successo di un programma di dialisi peritoneale è strettamente dipendente dal buon funzionamento del catetere per dialisi peritoneale (PDC). Le principali cause di malfunzionamento, riscontrate con la tecnica tradizionale, sono rappresentate dalla dislocazione e dall' ostruzione meccanica secondaria principalmente ad impegno omentale o ad aderenze. Col fine di ridurne l' incidenza, dal 2009 abbiamo introdotto il posizionamento di PDC eseguito con assistenza laparoscopica. Questa permette di collocare l' estremo distale del catetere sotto visione, di fissare il catetere al peritoneo parietale e di eseguire una' omentectomia parziale videoassistita. Presentiamo la nostra esperienza col posizionamento video-assistito di PDC
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