1,721,035 research outputs found
How fast is the linear chain trick? A rigorous analysis in the context of behavioral epidemiology
Full text linkA prototype SIR model with vaccination at birth is analyzed in terms of the stability of its endemic equilibrium. The information available on the disease influences the parents' decision on whether vaccinate or not. This information is modeled with a delay according to the Erlang distribution. The latter includes the degenerate case of fading memory as well as the limiting case of concentrated memory. The linear chain trick is the essential tool used to investigate the general case. Besides its novel analysis and that of the concentrated case, it is showed that through the linear chain trick a distributed delay approaches a discrete delay at a linear rate. A rigorous proof is given in terms of the eigenvalues of the associated linearized problems and extension to general models is also provided. The work is completed with several computations and relevant experimental results
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
Prevalence of metabolic syndrome and its components in women with and without pelvic organ prolapse and its association with prolapse severity according to the Pelvic Organ Prolapse Quantification system.
No full textINTRODUCTION AND HYPOTHESIS:
Data regarding possible associations between metabolic syndrome (MS) and pelvic organ prolapse (POP) are scarce. The primary hypothesis was that the prevalence of MS and its components was higher in postmenopausal women with POP than in age-matched women without POP staged with the Pelvic Organ Prolapse Quantification system (POP-Q). The secondary aim of the study was to analyze the association between MS and its components with POP severity.
METHODS:
Presence of MS and its components [elevated triglycerides (TG), waist circumference, blood pressure, and fasting glucose (FG) and decreased high-density lipoprotein cholesterol (HDL-C)] were assessed in 122 women with POP (POP-Q stage I-IV) and 77 without (POP-Q 0). Fasting insulin resistance [homeostasis model assessment for fasting insulin resistance (HOMA-IR)] was also assessed.
RESULTS:
TG levels, FG, and HOMA index were significantly higher in POP-Q stage I-IV compared with POP-Q 0 (p = 0.04, p = 0.0005 and p = 0.04); HDL-C was significantly reduced in POP-Q stage I-IV compared with POP-Q 0 (p = 0.0003). TG levels (p = 0.0315) were significantly higher in POP-Q stage III and IV vs. POP-Q 0; FG and HOMA-IR (p = 0.0015 and p = 0.0204) were significantly higher in POP-Q stage IV vs. POP-Q 0; HDL-C (p = 0.0047) was significantly lower in all stages vs. POP-Q 0. The prevalence of MS was different between groups (p = 0.04) and higher in POP-Q IV. Elevated TG [odds ratio (OR) 4.6, 95% confidence interval (CI) 1.5-9.3, p = 0.004] and reduced HDL-C (OR 2.0, 95% CI 1.1-3.7, p = 0.0241) significantly increased the risk of POP-Q stage ≥III.
CONCLUSIONS:
MS and its components may be associated with POP. Elevated TG and reduced HDL-C are associated with POP severity
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
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
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
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