1,721,010 research outputs found
Analytical and numerical analysis of the tomographic resolution with bandlimited signals
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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
Analisi della risposta sismica locale a San Giuliano di Puglia con modelli 1D, 2D e 3D.
No full textSOMMARIO: L’articolo presenta i risultati di un confronto tra simulazioni numeriche di risposta sismica locale a San Giuliano di
Puglia mediante modelli 1D, 2D e 3D e registrazioni di diverse repliche del terremoto del Molise del 2002. Le registrazioni
sono state ottenute dalle stazioni sismiche temporanee installate, sia nel centro storico (riferimento) e sia nella zona più di recente costruzione, subito dopo l’evento principale del 31 ottobre 2002 (MW=5.7). Le analisi di risposta sismica locale con il modello 3D hanno interessato un volume di sottosuolo di dimensioni 2000 x 2000 x 1500 m che include l’intero centro urbano. A tale scopo è stato costruito un modello geologico 3D dell’area investigata. Il modello 2D si sviluppa lungo la sezione longitudinale del rilievo su cui è costruito l’abitato, mentre le simulazioni 1D sono state eseguite in corrispondenza delle verticali passanti per tre stazioni. I modelli 1D e 2D, al contrario di quello 3D, portano in conto in dettaglio l’eterogeneità verticale ed orizzontale del sottosuolo evidenziata da un’estesa campagna di indagine geotecnica. I risultati delle analisi numeriche sono confrontati con le registrazioni delle stazioni sismiche temporanee in termini di funzioni di trasferimento e distribuzione di alcuni parametri sintetici del moto sismico (accelerazione di picco e intensità di Housner).
ABSTRACT: The paper reports the comparison between 1D, 2D and 3D
numerical simulations of seismic site response at San Giuliano di Puglia (Italy) and the amplification recorded in the aftershocks following the October 31st, 2002 Molise earthquake (MW=5.7).
The records were taken by mobile stations installed in the
historical center on a soft rock outcrop and in the newer part of the town on a marly clay formation. The site response analyses by the 3D model involved a subsoil volume of about a 2000 x 2000 x 1500 m, including the extension of the whole town center at surface. 2D site response analyses were carried out on a section developing along the longitudinal axis of the town, and 1D simulations were referred to the subsoil profiles at the seismic stations. 1D and 2D models accounted for the heterogeneity of clayey formation, along both vertical and horizontal directions, as evidenced by a comprehensive geotechnical investigation. The results of numerical predictions are compared to the aftershocks records in terms of amplification functions and ground motion parameters (peak acceleration and Housner intensity)
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
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