1,720,964 research outputs found
Stima dell'individualità psico-fisiologica in operatori di call center.
No full textAlcuni importanti indicatori psicologici (ricavati da test psicometrici) e fisiologici
(frequenza cardiaca e attività elettrodermica cutanea) sono stati registrati nel corso
della normale attività lavorativa in un gruppo di operatori di call center. Differenze
interindividuali relativamente stabili nel tempo sono più facilmente evidenziabili per
mezzo degli indicatori psicologici e, fra quelli fisiologici, i più sensibili in tale contesto
risultano la frequenza cardiaca e la sua variabilità. L’attività elettrodermica cutanea,
d’altra parte, si conferma, in tutti gli individui, come il più sensibile e rapido indicatore
di risposta alle sollecitazioni dell’ambiente di lavoro
Breaking down the climate effects on cod recruitment by principal component analysis and canonical correlation
No full textThe pattern of temporal correlations between cod recruitment and sea temperature, in conjuction with the climate variability of atmospheric pressure anomalies (NAO index) was investigated by means of a combined use of principal component analysis (PCA) and canonical correlation analysis (CCA), using time series collected in the area surrounding the Kola peninsula (Barents Sea) and in the North Sea. The proposed data analysis strategy, namely to carry out a PCA of the temperature, cod recruitment and NAO time series followed by a CCA between the component spaces of all the possible data sets couples (recruitment vs temperature, recruitment vs NAO and NAO vs temperature), allowed us to sketch a general model of correlation between climate and cod recruitment dynamics. Two independent effects of temperature variability on cod recruitment emerged for the Kola region, pointing to the existence of at least 2 different mechanisms of comparable importance by which temperature may affect cod recruitment. In the North Sea the situation is somewhat simpler, and the data are compatible with only 1 major interaction mechanism. Moreover, the general effect of temperature on cod recruitment was opposite in the 2 regions: direct correlation for the Barents Sea, inverse correlation for the North Sea. This is probably due to the existence of an optimal temperature regime for cod recruitment lying in between the 'cold' Barents Sea and the 'warm' North Sea
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
Non linear signal analysis methods in the elucidation of protein sequence/structure relationships
No full textWe tried to present the general meaning and scope
of the application of signal analysis methods to
protein sequence-structure relationships. In our
opinion, the dominant character of this nascent field
concerns the number of the contributing disciplines,
both in terms of methodological (the data analysis
techniques come directly from engineering, applied
mathematics, computational physics) and theoretical
influence (the basic assumptions informing the various
approaches coming from molecular biology, evolutionary
genetics, physical chemistry, biochemistry).
As eloquently discussed in the Laughlin et al. paper
entitled “The Middle Way” (P. Proc. Natl.
Acad. Sci. U.S.A. 2000, 97, 32) the frontiers of science
are rapidly shifting from the investigation of the basic
bricks of matter to the elucidation of mesoscopic
principles of organization. The study of proteins is perhaps the most typical
“mesoscopic” investigation field with its mixing of
basic physical laws, empirical results, and qualitative
descriptions.4 In this review we describe a particular
approach that adopts an empirical style typical of
medicinal chemistry, letting general principles emerge
from the practical solution of local cases
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
- …
