1,720,969 research outputs found
Problematic Internet Use: Prevalence and related factors in a sample of Italian High School students
No full textProblematic Internet Use (PIU) has emerged in recent years as a problem among teenagers worldwide. Currently, little is known about its potential risk factors. We designed a cross-sectional study to measure the prevalence of PIU and identify its related factors in a sample of high school Italian students. Information on socio-demographic and psychological factors was gathered through an anonymous questionnaire including the Internet Addiction Test (IAT). All the schools of Pinerolo district in Piedmont region were invited to participate in the study, and all accepted. A total of 2022
students from 25 high schools participate in the survey between December 2010 and March 2011. Almost all students declared to use Internet (99.4%). The prevalence of PIU was 12.0%. Multivariate logistic regression analysis revealed that people attending a vocational school (OR = 1.62; 95% CI 1.07-2.47), being of a younger age (OR = 1.71; 95% CI 1.08-2.70), feeling lonely (OR = 3.65; 95% CI:2.05-6.51), visiting pornographic sites (OR = 2.44; 95% CI 1.62-3.69), logging onto the Internet several times a week, and connecting for at least two hours consecutively (OR = 2.34; 95% CI 1.60-3.41) were risk factors for PIU, while searching for information for school purposes was a protective factor (OR= 0.48; 95% CI 0.33-0.70). No gender differences were detected. The
high prevalence of PIU observed in this population suggest particular care to be applied by teachers and parents in checking at-risk habits of pupils when using Internet, and the need of public health practitioners to plan preventive interventions
Differenze regionali nella mortalità da Overdose e possibili spiegazioni
No full textIntroduzione. La mortalità da overdose in Italia è caratterizzata da una elevata variabilità inter-regionale. A partire dalla fine degli anni ’80 si è inoltre osservato un generale innalzamento dei tassi di mortalità con due picchi, il primo nel 1990 e il secondo nel 1996. I picchi si sono verificati nella maggior parte delle regioni ma con entità molto differente.
Obiettivi. L’obiettivo di questo lavoro è analizzare le possibili cause della variabilità inter-regionale nella mortalità per overdose.
Metodi. Sono state ipotizzate le seguenti cause: 1) variabilità della purezza della sostanza sul mercato; 2) diversa prevalenza di tossicodipendenti; 3) diversa prevalenza di poliuso di sostanze; 4) variabilità nei trattamenti somministrati. I tassi di mortalità da overdose sono stati stimati a partire dai dati del Registro Generale di Mortalità dell’Istat. I dati sulla prevalenza di tossicodipendenti da eroina e sulle tipologie di trattamento erogate sono stati reperiti dai flussi Ministeriali e dalle relazioni al Parlamento sulle tossicodipendenze. Per studiare la purezza della sostanza sul mercato sono state cercate informazioni ad hoc.
Risultati. Il tasso di mortalità standardizzato nel primo picco del 1990 è di circa 2,0/100.000 abitanti in Italia, mentre è compreso tra 3,0 e 3,7/100.000 in Piemonte, Lombardia, Liguria e Lazio. Il secondo picco è di entità simile al primo in Piemonte, mentre è inferiore ma sempre più elevato della media italiana in Lombardia, Lazio, Umbria ed Emilia. Il numero di nuovi utenti SerT, utilizzato come indicatore delle dimensioni dell’andamento del fenomeno tossicodipendenza, non appare essere diverso nelle regioni a più alto tasso di mortalità rispetto alla media Nazionale e alle altre regioni, così come la proporzione di poliusatori. I trattamenti erogati mostrano al contrario ampie differenze tra le regioni nel periodo considerato, ed in particolare il metadone a lungo termine.
Conclusioni. Il numero di nuovi utenti SerT, e la prevalenza di poliusatori mostrano un andamento simile nelle diverse regioni. Le differenze nei trattamenti somministrati sembrano poter spiegare parte della variabilità inter-regionale nella mortalità da overdose. Il ruolo della purezza della sostanza sulle differenze osservate è difficile da definire a causa della scarsità d’informazioni disponibili a tal proposito
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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