1,721,154 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
The manifestation of AIDS in Africa: An epidemiological overview
No full textThe HIV epidemic in Africa has changed over the last decade and the incidence of AIDS, which was very low at the beginning of nineties, is now dramatically increasing. In this paper, we analyze the current situation of AIDS epidemiology on the continent, based on data generated by the antenatal care surveillance systems. As described here, the spread and prevalence of HIV differ in each African country, with South Africa now facing the worst situation. In addition, we have focused our attention on the modes and risks of viral transmission, highlighting the spread of HIV in particular subpopulations, which, for different reasons, prove to be more affected by the epidemic, such as sex workers and children. Genotype evolution and distribution in the various geographical areas are also considered. From this brief overview, it appears clear that poverty, the lack of technologies and inadequate resources, due mostly to social and economic instability, are widening the already existent gap between Africa and industrialized countries. (copyright) 2005 Journal of NeuroVirology
How plausible is a link between HSV-1 infection and Alzheimer's disease?
No full textAlzheimer's disease is a leading cause of dementia with a multifactorial and still barely understood etiology. A growing body of epidemiologic and experimental data support a role for infectious agents in this process; herpes simplex virus 1 (HSV-1), in particular, is a strong suspect. We briefly summarize the data pointing at a pathogenic role for HSV-1 in the development of Alzheimer's disease and review results indicating that antiviral might be beneficial in the therapy of this condition
A novel high-quality YUV-based image coding technique for efficient image storage in portable electronic appliances
No full textCurrent trends in the market of mobile display applications demonstrate the interest in increasing the qualify of image representation in portable imaging devices. Due to,he implementation constraints dictated by the display driver electronics, however, this makes the availability of efficient, low-cost, embedded image compression engines highly attractive. We propose a YUV-based image encoding strategy that combines the advantages of alternative popular image compression schemes. We evaluated the performance of the proposed method by measuring the associated compression PSNR to show that it is independent of the characteristics of, the target image, which makes the technique capable of addressing a variety of display-based applications. We also provide implementation data to demonstrate that the effort of embedding our digital compressor within commercial display driver ASICs is negligible, while typical 10% saving in the total driver size can he achieved because of the on-chip memory reduction(1)
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
Pathogenic mechanisms of meningitis/encephalitis caused by human herpesvirus-6 in immunocompetent adult patients
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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
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