1,721,050 research outputs found
Wood Artworks Monitoring Through High-Resolution 3d Cameras
No full textThis paper shows the applicability of non-contact 3D imaging technology to the dimensional monitoring of wooden artworks. The results of a study on a wooden test artifact submitted to sudden environmental parameters changes (temperature and humidity) are presented. It was possible to verify that the range maps generated by a 3D camera based on optical triangulation have the necessary resolution to show dimensional variations in the order of a few tenths of a millimeter. 3D models generated before and after the parameter variation were processed with a specific software in order to highlight the amount of deformation through a color coded image. The results demonstrate that such technique represents a unique instrument to capture and track the deformations of wooden artifacts before they become permanent. This study has been conducted in collaboration with the laboratories for restoration of the "Opificio delle Pietre Dure" at Florence, Ital
Il David di Donatello - Modellazione digitale tridimensionale di Beni Artistici mediante Laser Radar FM CW
No full textIl contrasto luce-ombra come tecnica di rilievo: un esperienza didattica
No full textOmbra e luce costituiscono la tela ed il pennello della rappresentazione figurativa; permettono di imprimere un carattere ad un soggetto e determinano l’atmosfera in cui sta immerso, ma la loro funzione può andare oltre le peraltro non banali frontiere dell’estetica.
È infatti grazie all’alternanza tra luce, utilizzata come elemento “esplorante”, ed ombra, vista come lo stato inerte di un oggetto da rappresentare, che i moderni sistemi di rilievo tridimensionale a luce strutturata consentono di acquisire in forma digitale l’andamento di una superficie. Questo è il passaggio chiave che attraverso una successiva fase di post-processing porta alla creazione del modello tridimensionale di un oggetto a partire da nient’altro che l’oggetto stesso.
Soprattutto nelle applicazioni di design il processo completo di reverse modeling assume ad oggi un ruolo chiave ed è quindi importante introdurre questi elementi all’interno di corsi universitari che siano al passo con i tempi.
Il lavoro qui descritto illustra un’esperienza didattica svolta presso l’Università di Firenze. L’esercizio è consistito nella modellazione tridimensionale di un vecchio scooter “Vespa” della Piaggio, attraverso le tecniche di scansione 3D a luce strutturata, affiancate da metodi tradizionali come la dima, passando attraverso strumenti più raffinati, ma d’uso ormai comune quali ad esempio la stazione totale.
Sono illustrate le modalità operative con cui si è mosso tutto il gruppo di lavoro e sarà infine presentata una selezione dei migliori risultati ottenuti sotto forma di rendering dei modelli più fedeli. Sarà infine discussa la valenza didattica di esperienze del genere nell’attuale contesto professionale
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
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