1,720,961 research outputs found
Test of a building vulnerability model for L'Aquila earthquake
No full textDuring 2002, as part of a collaboration between the National Civil Protection Department and the University of L'Aquila, a methodology for assessing the vulnerability of an urban center was developed. The methodology considered the urban territory as well as the complex of physical and functional relationships of the urbanized territory and not a simple summation of elements, in order to analyze simultaneously the multiple factors necessary to determine the vulnerability of the whole center. This methodology was applied to the city of L'Aquila and two other smaller towns, and in previous studies, some maps representing the possible vulnerability of buildings were prepared for the centre of the city of l'Aquila. These maps graduate the possible vulnerability in four different classes and have a maximum resolution of 25 m. After the earthquake in April 2009, it is possible to assess the accuracy of the model comparing predicted vulnerability with the map of fitness for human habitation realized after the earthquake. The vulnerability map considered the buildings situated on the emergency routes, therefore, the comparison was carried out only for these areas. After the seismic event, the map of fitness for human habitation and the actual post-earthquake damage were available: these results were archived in an Access database and also mapped on a 1:2,000 city map. To assure the consistency of these data, Access databases were geocoded and so cross checked with the results reported in the map files. The maps so obtained and verified were compared with the maps of the predicted vulnerability, rasterizing the information reported on the two maps at the same resolution. Thus, it has obtained a raster file containing differences between the vulnerability predicted and observed damages, evidencing that the biggest differences are limited to some small areas. Observing the localization of these areas, it seems that there may exist a correlation between biggest mismatch and some geophysical characteristics of the terrain that can cause local attenuation or amplification of the seismic waves. However, further investigations have to be carried on to confirm these initial results. The main elaborations were performed in open-source packages: GRASS, Q-GIS, and gvSIG. © Società Italiana di Fotogrammetria e Topografia (SIFET) 2011
Test of seismic vulnerability maps and their prospective implementation in Plan4all data models
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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
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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