1,720,970 research outputs found
Close-range photogrammetry, virtual reality and their integration in archaeology
No full textThe paper describes an experience of integration of different topographic and photogrammetric surveying methods, together with photographic virtual reality techniques, in the area of the ancient town of Bakchias (Fayyum, Egypt). The surveys were conducted with the aim of recording metrical, and non metrical information, in a common reference system, allowing to support GIS based multimedia realisations. The capabilities and advantages of the application of digital techniques in archaeology and Cultural Heritage are shown by some examples, related to surveying of structures and small objects. One main objective of the work is to assess the potentiality of virtual reality technologies as core of a system permitting a site to be studied from remote locations using Internet; the use of these technologies are today mainly devoted to qualitative purposes (visualisation and interactive exploration), but the interface with simple surveying software applications, based on digital photogrammetry, could bring new powerful instruments also for metrical investigation
Rilievo e rappresentazione di siti archeologici: l'isola di Nelson (Alessandria, Egitto)
No full textRilievo e rappresentazione di siti archeologici: l'isola di Nelson (Alessandria, Egitto
Il rilievo tridimensionale in alta risoluzione del complesso della fontana del Nettuno
No full textDall'introduzione al capitolo da parte del curatore del volume: "(...) è descritto lo straordinario sforzo che è stato necessario per produrre il rilievo e costruire il modello 3D della fontana e dei sotterranei. Per avere un’idea della complessità di questa operazione occorre sapere che la fontana ha una base di circa 7,4 m e un’altezza di 9 m (di cui gli ultimi 4 m sono la statua con il tridente) a cui va aggiunta la parte sotterranea, che non solo andava rilevata, ma anche riconnessa alla parte fuori terra per identificare e sviscerare i problemi attuali e sviluppare proposte progettuali corrette e coerenti. Si tratta cioè di un complesso imponente per il quale le precedenti esperienze di rilievo tridimensionale ad alta risoluzione risultavano un riferimento marginale. Basti pensare, per esempio, al David di Michelangelo, il cui rilievo costituisce ancora oggi il riferimento ineguagliato a più di 15 anni dalla sua realizzazione, ma che è alto solo poco più di quattro metri. Il rilievo è stato progettato e realizzato dall’area di Geomatica del Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali (DICAM) (avvalendosi della collaborazione dello Studio MCM di Roma per una parte delle operazioni di scansione): ne è risultato uno straordinario modello 3D di complessivi 655 milioni di poligoni (per la parte sopra terra) e più di un miliardo di pixel di mappe del colore.
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
3D DIGITISATION IN CULTURAL HERITAGE KNOWLEDGE AND PRESERVATION: THE CASE OF THE NEPTUNE STATUE IN BOLOGNA AND ITS ARCHETYPE
Full text linkIn the field of Cultural Heritage, the availability of a complete, detailed and photo-realistic 3D model of the objects of interest permits to describe all the aspects related to geometry, colours and materials, as well as the work techniques and the decay state. Besides, it offers multiple possibilities for the documentation, the analysis and the study.
This paper describes the experience, carried out by the DICAM Geomatics group of the University of Bologna, about the 3D digitisation of two important statues of Neptune, by means of the integration of 3D image-based and range-based techniques. The two artworks, both realized by the sculptor Giambologna, are the big bronze statue of the god adorning the homonymous fountain, one of the most symbolic monuments of the city of Bologna, and its archetype, exhibited in one of the civic museums.
The obtained 3D models, beyond the important function of documentation, knowledge and preservation of the two objects, also permit a comparison between the small archetype, conveniently scaled, and the big final statue. In the manuscript all the surveying and data processing operations concerning the objects digitisation are described. Particular attention is paid to the problems related to the scale of the archetype and the comparison between the two obtained 3D models, with the aim to evaluate and represent the occurred changes
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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