1,721,119 research outputs found
Alternative air pollution measures for detecting short-term health effects in epidemiological studies
No full textThere are many aspects of model choice that are involved in epidemiological studies of the effects of air pollution on health. One of these aspects has to do with exposure assessment of the study population. In this article we propose a different exposure assessment paradigm based on three measures of exposure, named night exposure, severity and duration. The role of these variables is to better grasp personal exposure from ambient concentrations and to include in the models an idea about the pattern of exposure, i.e. short/long exposures to medium/high levels of pollutants. Use of this new setting for the analysis of the relationship between air pollution and hospital admissions for respiratory disorders in the Italian city of Verona showed the potential of the new setting to deepen understanding of the nature of the association between air pollution and health. Copyright © 2002 John Wiley & Sons, Ltd
Re: A.C. Salgarelli, et al., Tarsal strip technique for correction of malposition of the lower eyelid after treatment of orbital trauma, Br J Oral Maxillofacial Surg 47 (2009) 298-301
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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
Trans-nasal endoscopic marsupialization of a voluminous radicular cyst involving maxillary sinus and nasal cavity: A case report and a literature review on this surgical approach
Full text linkThe treatment of a huge cystic lesion in the upper jaw involving the respiratory cavities may result challenging. A traditional oral approach entails patient discomfort and may have negative aesthetic implications. This treatment, particularly in case of enucleation not preceded by marsupialization for volumetric reduction of the lesion, may cause irreversible damage to important anatomical structures and the collapse of the bone architecture. The purpose of this case report is to show the benefits of an endoscopic trans-nasal approach for the definitive treatment of such a clinical situation. The surgical technique aimed to remove part of the cystic wall and to open the inner compartment of the lesion to the nasal cavity after the resection of the anterior edge of the inferior turbinate and the lateral wall of the inferior nasal meatus. After a follow-up period of 18 months, without any problem or discomfort for the patient, the cyst appeared radiologically healed without the loss of any lesion-associated tooth. The bone nasal cavity, the maxillary sinus and the anterior alveolar process architecture, noticeably modified by the expansive enlargement of the cyst, resulted completely restored with a complete recover of the respiratory and oral functions
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
Modeling the relationship between perceived neighbourhood characteristics and adult hospitalization frequencies from a cross-sectional study
No full textInterest in the quantitative effects of neighbourhood characteristics on urban health has recently increased in social epidemiology. Such effects are mostly studied employing multilevel models based on some definition of the neighbourhood. We investigate the statistical relationship between health and the neighourhood quality as perceived by individuals, thus avoiding the need of choosing a specific definition of neighbourhood.
We use data from the Los Angeles Family and Neighbourhood Survey (L.A.FANS). We measure health status of an individual as the number of hospitalizations in the last two years. This number is related to individual carachteristics (including neighbourhood perceptions) through generalized additive models (GAM), focusing particularly on the Zero Inflated Poisson (ZIP), which is an unusual choice in this context.
We also overcome to some extent the difficulties in interpreting the results from a GAM with a ZIP distribution by simulating predicted values under varying assumptions in order to reveal the relationship of interest.
The analysis confirms that the quality of neighbourhood – as measured by perceptions of individuals – significantly relates to the health status of inhabitants – as measured by the number of hospitalizations
Studio degli effetti a breve termine dell'esposizione ad inquinamento atmosferico sulla ricoverabilita' giornaliera
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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