1,720,988 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
Mycobacterium tuberculosis in ospedale: è patogeno nosocomiale? oppure occupazionale?
No full textLa tubercolosi costituisce una emergenza sanitaria per la salute pubblica, oltre che una problematica confinata agli ambienti lavorativi. Per tale ragione le autorità sanitarie redigono ed aggiornano costantemente linee guida di notevole valore scientifico e pratico. Recenti episodi di cronaca hanno riportato alla ribalta la tubercolosi come patologia nosocomiale, la cui trasmissione può avvenire da operatore sanitario a paziente. Per quanto concerne gli operatori sanitari, una recente revisione della letteratura ha confermato che il rischio di infezione tubercolare latente e di tubercolosi sono maggiori in questa categoria rispetto alla popolazione generale. Gli strumenti di riduzione del rischio di tubercolosi in ambito nosocomiale si basano innanzitutto sull’adozione di misure di isolamento respiratorio; tuttavia tali procedure richiedono il rapido riconoscimento del sospetto clinico. La diagnosi microbiologica di tubercolosi si basa sul reperto di bacilli tubercolari nel campione clinico. La ricerca di tali microrganismi può essere eseguita con l’esame microscopico, colturale e con tecniche rapide di biologia molecolare.Tuberculosis is an emergency for public health, as well as an issue confined to working environments. For this reason, the health authorities draw up and regularly update guidelines of considerable scientific and practical value. Recent reports have shown tuberculosis as a nosocomial disease whose transmission can occur from healthcare environment to patient. With regard to healthcare workers, a recent literature review confirmed that the risk of latent TB infection and tuberculosis is greater in this category of workers than in the general population. The tools for risk reduction in nosocomial TB are based primarily on respiratory isolation measures. However such procedures require the rapid recognition of clinical suspicion. The microbiological diagnosis of tuberculosis is based on the detection of tubercular bacilli in clinical specimens. The research of these microorganisms can be done using microscopic and coltural examination as well as rapid molecular biology techniques
Early and sustained virological response in non-responders with chronic hepatitis C: a randomized open-label study of pegylated interferon-alpha-2a versus pegylated interferon-alpha-2b
No full textEarly and sustained virological response in non-responders with chronic hepatitis C: a randomized open-label study of pegylated interferon-alpha-2a versus pegylated interferon-alpha-2b
No full textVariations 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
Peg-interferon alpha-2a versus Peg-interferon alpha-2b in nonresponders with HCV active chronic hepatitis: a pilot study
No full textDispelling 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
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