1,720,956 research outputs found
Analisi multitemporale di immagini satellitari per il monitoraggio di aree colpite da alluvione
No full textMultitemporal Thermal Imagery Acquisition and Data Processing on Historical Masonry: Experimental Application on a Case Study
Full text linkThe recent improvement of infrared image quality has increased the use of thermography as a non-destructive diagnostic technique. Amongst other applications, thermography can be used to monitor historic buildings. The present work was carried out within the framework of the Horizon 2020 European project SHELTER, which aims to create a management plan for cultural heritage subject to environmental and anthropogenic risk. Among the chosen case studies is the Santa Croce Complex in Ravenna (Italy), which is exposed to different hazards, including flooding. The church has a peculiar architecture that develops below the street level, so the internal walls are affected by the deterioration caused by rising humidity. In such a case of advanced degradation, passive thermography cannot be used to its full potential. For this reason, an innovative methodology involving active thermography was first developed and validated with laboratory tests. Secondly, we conducted its first application to a real case study. With this purpose, an active thermography survey with forced ventilation was carried out to enhance different stages of material degradation by means of automatic classification of multitemporal data. These experiments have resulted in a method using an active thermal survey in a high moisture content environment to detect masonry degradation
Mappatura dei materiali di copertura degli edifici da immagini WorldView-3
No full textLa disponibilità di immagini satellitari ad alta risoluzione sia spettrale che spaziale amplia notevolmente la gamma di applicazioni del telerilevamento in ambito urbano. In particolare, le immagini WorldView-3 (WV3) si compongono di una banda pancromatica con risoluzione spaziale di 0,3 m, 8 bande nel visibile e infrarosso vicino (VNIR) a 1,2 m e 8 bande nell’infrarosso ad onde corte (SWIR) a 3,4 m. Il presente studio si propone di valutare le potenzialità di queste immagini per l’identificazione di edifici e la classificazione dei materiali di copertura. L’area di studio scelta per la sperimentazione comprende l’intera area urbana di Bologna (100 km2), su cui sono state acquisite due coppie stereoscopiche pancromatiche e multispettrali ed una immagine nello SWIR. Per l’estrazione degli edifici, si è scelto un approccio orientato a oggetti, basato sia sulle informazioni morfologiche derivanti dal DSM che sulle informazioni spettrali e tessiturali derivanti dalle immagini multispettrali. Le classi identificate comprendono i principali materiali di copertura utilizzati nell’area, cioè coppi in argilla, guaine bituminose, fogli metallici di diverse colorazioni e coperture in ghiaia (lavata o sciolta). Ai fini del training del classificatore e della successiva validazione, è stato compilato un database di verità a terra riguardante circa 150 edifici, sulla base di rilievi in situ effettuati con un drone e alcuni sopralluoghi diretti. Dalla matrice di confusione è risultata un’accuratezza complessiva pari al 91% (K 0,89) sulla classificazione dei materiali di copertura. La procedura proposta si basa unicamente sulle immagini satellitari acquisite e può quindi essere facilmente replicata in qualsiasi contesto urbano
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
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