1,720,966 research outputs found
Epidemiologia della cecità ed ipovisione nell’infanzia: indagine su un campione di soggetti con handicap visivo che hanno presentato domanda per ottenere una borsa di studio
No full text
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
L’ipertensione arteriosa in età pediatrica. Studio di una popolazione scolastica
No full textMost authors fix the upper limits of normal blood pressure at 90th percentile according to age. Nevertheless in their investigation different instruments were used and the often did not relate in detail the position of the subject during the measurement. Other factors, influencing blood pressure values, have been often left out: relation with meals, room temperature, pain, drugs, stress, and so on. The prevalence of hypertension in pediatric age in literature is 0.6-12.4% with several intermediate values. The first very important research concerning the hypertension in pediatric age was carried out by Londe et alii, conducted among 1593 children (785 males and 798 females); they estimated mean values and percentiles according to age and sex. In the present study the authors saw 346 children (161 females and 185 males), 11-15 years old, observed at school, in a comfortable room. Pressure measurement was done twice in the same morning with half an hour interval. Systolic pressure, 4th and 5th Korotkoff tones, was noticed. 11% of the children had systolic pressure values under 50th percentile, 35.3% between 50th and 90th percentile, and 43.1% had values equal to or greater than 90th percentile at the first measurement. The third group went down to 30.6% (106 cases) at the control (after an half an hour). This reduction shows the importance of the emotional factors in the P.A. variations. The 106 children who had systolic and/or diastolic values equal to or greater than 90th percentile were controlled again after a week. 92 children maintained the same values. They were called for the third sitting 1-6 months later. Only 45 subjects agreed our invitation and it was possible to point out that high blood pressure values persisted in 31 children (that is 8.9% of all examined cases). Following correlations were observed: (a) body weight-blood pressure values (either systolic or diastolic ones) and so cutaneous plica-pressure values (p<0.01); (b) moreover, 50% of the 31 hypertensive children had hypertensive parents; (c) the most frequent subjective symptom (13 cases) was cephalalgia. None of the studied school children showed either clinic or biochemical abnormal data, so that it was possible to define their hypertension as “essential”
Studio e valutazione dei test psicoattitudinali utilizzati nell'ambito delle ferrovie dello Stato
No full textAppropriate 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
- …
