1,721,011 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
Imaging of Haemophilic Arthropathy
No full textHaemophilia is an X-linked recessive genetic disorder characterized by spontaneous or trauma-related bleeds, especially in large joints. Repeated provoked or spontaneous joint bleeds are the hallmark of severe haemophilia. Recurrent or prolonged joint bleeds eventually lead to synovial hypertrophy, progressive cartilage degradation and bone damage through mechanical and metabolic joint destruction. Imaging of joints has always played an important role to assess outcome in haemophilia. Haemophilic arthropathy can be assessed using imaging techniques such as X-rays, Magnetic Resonance Imaging (MRI), and ultrasound. These techniques were evaluated in this thesis.
Key findings
The radiological Pettersson score is widely applied for classification of arthropathy to evaluate costly haemophilia treatment. The reliability and agreement (reproducibility) of the Pettersson score was studied in this thesis to evaluate to what extent differences in scores are attributable to observer-variation. A consensus atlas with reference images for scoring was developed which resulted in an improved reproducibility among observers.
With the increasing interest in MRI assessment of joints in haemophilia, the questions arise regarding the clinical meaning of MRI findings. In order to provide context for joint evaluation with MRI in young haemophilia patients, a cohort of young active healthy men was evaluated by MRI. Results suggested that sports participation is not associated with haemophilia specific MRI changes. A comparison of joint effusion between haemophilia patients and young active healthy controls showed that joint effusion on MRI is unlikely to be haemophilia specific.
So far, the prognostic value of MRI findings was based on assumptions only. This thesis shows that the bleeding risk is significantly increased in joints with synovial hypertrophy. In addition, haemophilia specific MRI findings in joints without changes on X-rays are associated with progression of arthropathy five years later. Therefore, it may be beneficial to guide treatment based on MRI findings.
As an alternative for joint evaluation with MRI, ultrasound might be more practicable in daily practice. Across different medical specialties, non-radiologists increasingly use point-of-care ultrasound (POC-US) for procedural, diagnostic, and screening purposes. In this thesis it was established that POC-US provides an accurate alternative for MRI for the assessment of synovial hypertrophy in young adults with limited arthropathy.
Clinical applications
For both clinical care and research, the optimal imaging modality depends on the clinical joint status. X-rays are mostly indicated for moderate-severe arthropathy as they are insensitive to early joint changes. MRI is the most sensitive imaging modality for the assessment of initial joint changes such as synovial hypertrophy, haemosiderin deposits, and cartilage defects. Its use is therefore recommended for assessment of the progression of arthropathy, or to evaluate the origin of clinical complaints. As synovial hypertrophy on MRI showed to be associated with an increased joint bleeding risk, treatment may be monitored or tailored based on the presence/absence of synovial hypertrophy on imaging. As the availability of MRI is limited, POC-US provides an accurate alternative for routine assessment of synovial hypertrophy
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
Systems Radiology and Personalized Medicine
No full textMedicine has evolved into a high level of specialization using the very detailed imaging of organs. This has impressively solved a multitude of acute health-related problems linked to single-organ diseases. Many diseases and pathophysiological processes, however, involve more than one organ. An organ-based approach is challenging when considering disease prevention and caring for elderly patients, or those with systemic chronic diseases or multiple co-morbidities. In addition, medical imaging provides more than a pretty picture. Much of the data are now revealed by quantitating algorithms with or without artificial intelligence. This Special Issue on “Systems Radiology and Personalized Medicine” includes reviews and original studies that show the strengths and weaknesses of structural and functional whole-body imaging for personalized medicine
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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