1,721,042 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
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
The role of Framingham risk score in the progression from mild cognitive impairment to dementia
No full textBackground: Mild cognitive impairment (MCI) often represents the clinical
manifestation of cognitive deterioration preceding Alzheimer’s disease
(AD). Currently, there are no reliable approaches for an objective evaluation
of the risk of developing AD in patients affected by amnestic MCI (aMCI).
Objective: The aim of this study was to verify whether the Framingham
cardiovascular risk profile (FCRP) could be useful to identify patients at the
highest risk of conversion from MCI to AD.
Methods: Patients with aMCI were carefully investigated to assess their
vascular risk profile. They were also submitted to a comprehensive neuropsychological
evaluation. FCRP was calculated for each patient and apolipoprotein
E (ApoE) genotype was determined from peripheral blood cells.
The main outcome was defined as a conversion to AD within 24 months after inclusion.
Results: 385 consecutive aMCI subjects were included. Age, FCRP, and
vascular age showed a fairly predictive value on conversion to AD. Selecting
the subpopulation of ApoE ε4 carriers, we observed that FCRP had an
increased performance in predicting the conversion. The rate of conversion
increased from 12.5% in the FCRP low-risk group to 43.2% in the high-risk
group (p < 0.0001). ApoE ε4 carriers had a 3.7-times increased probability
of conversion with respect to the other subjects (p < 0.0001).
Conclusions: FCRP assessment could be considered a reliable approach
to predict conversion to AD in aMCI subjects. The presence of ApoE ε4
increases significantly the risk of conversion. These data confirm the narrow
relationship between genetic and vascular risk factors in influencing the
evolution of cognitive impairment
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
La gestione di casi di Leishmania infantum nel canile di Imola: terapia e monitoraggio di cani infetti
No full textA huge, slow moving earth flow in the Northern Apennines: the Signatico landslide (Italy)
No full textThe Signatico landslide is located in Northern Italy, on the Po plain
side of the Apennines, along the river Parma. It is a complex landslide with a totallength of about 3 km (the accumulation zone only occupies over 1 km of the river bed). It involves rotational slides and falls from the crown, but the displaced material is very quickly weathered and dismembered, moving downstream as a long, slow flow. This landsli.de has undergone many reactivations, historically dating back to the Middle Ages.
Now, many human facilities are directly at risk: an important road, some villages and some other scattered houses. A comparison of aerial photos taken over the last 30 years was made, in order to identify signals of the landslide evolution while engineering-geological surveys investigated the landslide and the surrounding areas. A monitoring system is also in progress. The aim of this study is to forecast a possible new reactivation.
In this case, it is important to give, as soon as technically possible, the information to civil protection so that loss reduction measures can be adequately planned
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