1,720,961 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
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
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
Retinal obliterative vasculitis associated to contralateral retinal neovascularization in membranoproliferative glomerulonephritis
No full textPurpose: To report our experience with a peculiar case of asynchronous bilateral retinal vascular occlusion in a patient suffering from membranoproliferative glomerulonephritis. Case report: A 57-year-old dialysed male affected by membranoproliferative glomerulonephritis who underwent kidney transplantation complained of a sudden vision loss in his right eye (RE). His best-corrected visual acuity (BCVA) was 20/40 in RE and 20/20 in the left eye (LE); ophthalmological and fluorangiographic examinations revealed unilateral retinal obliterative vasculitis with panuveitis and apparent sparing of contralateral eye. About 6 months later the patient developed a branch retinal vein occlusion associated with a papillary neovascular membrane in LE. Corticosteroid therapy was administered and immunosuppressant dosage was increased with macular oedema reduction in both events. Conclusion: We report a case of unilateral retinal obliterative vasculitis and subsequent contralateral retinal neovascularization and branch retinal vein occlusion in a patient affected by membranoproliferative glomerulonephritis
Sclerochoroidal calcification as an incidental finding during oncological staging of a patient with parotid malignancy: A case report
No full textIntroduction: Incidental finding of mass lesion in the choroid represents a very challenging situation for the ophthalmologist. We describe a case of an incidental, computed tomography (CT)-hyperintense, choroidal lesion in a patient with parotid malignancy and renal failure, and how multimodal imaging helped us reaching the correct diagnosis. Case description: A 63-year-old man with parotid gland malignancy was brought to our attention because preoperative staging CT showed a hyperintense choroidal lesion of the right eye. Fundus examination showed a yellow elevated lesion near the superior temporal branch retinal artery. Enhanced depth imaging optical coherence tomography (EDI-OCT), A- and B-scan ultrasonography, and Indocyanine Green Angiography (ICGA) allowed us to exclude a malignant lesion and to diagnose a sclerochoroidal calcification. Conclusion: Multimodal imaging can guide the clinician to choose the appropriate therapeutic approach even in case of uncommon conditions like sclerochoroidal calcification
Punctate inner choroidopathy reactivation following COVID-19: A case report
No full textPurpose: The purpose of this study is to report our experience with a case of punctate inner choroidopathy (PIC) reactivation following COVID-19. Case report: A 29-year-old caucasian woman with past ophthalmological history of bilateral PIC reported sudden visual acuity decrease in her right eye (RE) 3 weeks after SARS-CoV-2 infection. Her best-corrected visual acuity (BCVA) was 20/32 in RE; fundus examination and multimodal imaging (including indocyanine-green angiography, fundus autofluorescence, and optical coherence tomography) was consistent with unilateral PIC reactivation. The active choroidal lesions responded to high-dose corticosteroids, with functional improvement. Conclusion: Sars-CoV-2 infection could induce autoimmune and autoinflammatory dysregulation in genetically predisposed subjects. We report a case of PIC reactivation following COVID-19
Evaluation of Athletic Population with Hip/Hamstring/Quad Injuries
No full textThe hip represents the most complex anatomical district from the diagnostic point of view. History and physical examination of the athletic hip are the key for the evaluation of patients presenting with hip pain. The examiner should consider that independent pathologies could show concomitant and overlapping signs and symptoms. This sub-chapter describes a comprehensive and systematic approach to the athlete with hip, hamstring, and tight pain
Reliability of open architecture anchors in biocomposite material: medium term clinical and MRI evaluation. Our experience
No full textOBJECTIVES: Comparing radiologic bone ingrowth and the clinical outcomes of an open-construct (PEEK) (polyether ether ketone) suture anchor with those of a bio-composite suture anchor (glycolic polylactic acid anchors, beta-tricalcium phosphate and calcium sulphate) in patients with arthroscopic rotator cuff repair. METHODS: From August 2017 to January 2019, 33 patients of both sexes, aged between 44 and 78 years underwent arthroscopic rotator cuff repair for tears considered repairable with an extension not exceeding4 cm. The bioabsorbable anchors used comprised glycolic polylactic acid/beta-tricalcium phosphate/ calcium sulphate, and the non-absorbable anchors in polyetheretherketone (PEEK). All patients underwent MRI evaluation at 12 months postoperatively to determine complications and identify any re-tear. RESULTS: Clinical scores showed an improvement from both clinical and functional point of view. There were no statistically significant changes compared to the physical examination. On radiographs, mobilizations, anchor pull-outs or other complications did not occur in each group. CONCLUSIONS: Shoulder function improved after complete repair of the rotator cuff and similar clinical results were achieved regardless of the material and shape of the suture anchor. The bioabsorbable anchors in innovative open architecture material seem to have results comparable to peek anchors. Unfortunately, further studies are needed to define the advantages in using one material compared to the other. (www.actabiomedica.it)
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
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