1,720,963 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
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
Ruolo della vitamina D nei pazienti con malattia renale cronica
No full textRiassunto. L’insufficienza renale cronica (IRC) rappresenta oggigiorno un importante problema di salute pubblica in considerazione della sua prevalenza in aumento e della morbilità e mortalità correlate alle sue complicanze. Sebbene l’IRC sia asintomatica fino agli stadi terminali di malattia, precocemente si manifestano importanti anomalie dell’omeostasi minerale che comprendono i livelli sierici di calcio, fosforo, vitamina D e paratormone (PTH). Queste alterazioni metaboliche hanno un forte impatto sulla storia clinica e sulla prognosi dei pazienti affetti da IRC, dal momento che sono correlate con lo sviluppo di complicanze cardiovascolari. Il termine Chronic Kidney Disease-Mineral Bone Disease (CKD-MBD) è stato coniato per dare una nuova definizione alla malattia ossea in corso di CKD, connotandola come un disordine sistemico strettamente legato allo sviluppo di calcificazioni vascolari e all’insorgenza di problematiche cardiovascolari. Il deficit di vitamina D ha un ruolo centrale nella patogenesi della CKD-MBD. La vitamina D, infatti, mediante il legame con suoi specifici recettori (VDRs), ubiquitari nell’organismo, esercita numerose azioni pleiotropiche quali la inibizione sullo sviluppo dell’iperparatiroidismo secondario, effetti anti-ipertensivi, anti-infiammatori, anti-fibrotici, immunomodulanti, anti-proliferativi, anti-diabetici ed anti-proteinurici. Questi meccanismi spiegano, almeno in parte, come lo stato della vitamina D possa influenzare in modo rilevante lo sviluppo di complicanze cardiovascolari e la progressione del danno renale in corso di CKD. Tali osservazioni confermano l’importanza di una diagnosi precoce dei disturbi dell’omeostasi minerale in corso di CKD e la necessità di correggere il deficit di vitamina D per evitare lo sviluppo di problematiche cardiovascolari e degli eventi maggiori ad esse correlate.Chronic kidney disease (CKD) is a relevant health problem due to its worldwide increasing prevalence and the morbidity and mortality linked to its complications. Since the early stages of CKD, although patients are completely asymptomatic, important mineral homeostasis disorders occur. These disorders, involving serum levels of calcium, phosphorus, parathyroid hormone, and vitamin D, have a striking impact on patient prognosis as they affect the cardiovascular system. The new term of Chronic Kidney Disease-Mineral Bone Disease (CKD-MBD) was introduced to label bone disease during CKD as a systemic disorder tightly linked to cardiovascular calcifications and disabilities. Vitamin D deficiency has a main role in the pathogenesis of CKD-MBD, throughout the pleiotropic actions of this hormone. Vitamin D receptors (VDRs) are ubiquitous and their activation has shown protective effects against secondary hyperparathyroidism development and anti-hypertensive, anti-inflammatory, anti-fibrotic, immunomodulating, anti-proliferative, anti-diabetic and anti-proteinuric properties. These mechanisms explain, at least in part, vitamin D status influence in avoiding and delaying cardiovascular disease and CKD progression. These findings strongly support the importance of an early diagnosis of mineral homeostasis disorders in CKD and the need for correction of vitamin D deficiency to prevent related disabilities and major events
Which cannulation technique for which patient
No full textCannulation of arteriovenous (AV) access is a crucial part of vascular access management in hemodialysis patients. It can significantly affect survival of the AV access, and consequently, it probably influences patient survival. The best type of cannulation technique, rotating site versus constant site (or buttonhole), is currently debated, but the increase in infectious complications observed with the buttonhole technique suggests a prudent use of this technique, restricting it to specific patients. Even in cases with a specific indication, the balance between advantages of the constant site needling and the potentially severe consequences of access related systemic infection should be considered. Educational efforts in improving cannulation skills of dialysis staff are important for improving outcomes, as the proper use of the rotating site technique might still be the best approach to cannulation
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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