1,721,094 research outputs found
Rilievi laser scanner e fotogrammetrici del Camposanto Monumentale di Piazza del Duomo, Pisa
No full textL’evoluzione tecnologica della strumentazione laser scanner da terra ha determinato una precisione sempre crescente del rilievo ed una sempre maggior velocità di esecuzione dello stesso. In tal modo le applicazioni del laser a rilievi architettonici ad alta risoluzione sono divenute un valido supporto e costituiscono una ottima integrazione del classico rilievo fotogrammetrico. La possibilità di realizzare rilievi a passi di scansione molto piccoli, accompagnata alla ottima precisione ricavabile, anche da singola misura, ed alla possibilità di realizzare pressoché in tempo reale il rendering della foto dell’oggetto rilevato sul modello tridimensionale, permettono di utilizzare il modello ottenuto anche a scopo di restauro, dove gli operatori necessitano di un rilievo dettagliato a grandissima scala. Grazie alla gentile concessione dell’Opera Primaziale Pisana è stato realizzato un rilievo ad alta risoluzione della facciata del Camposanto monumentale situato nella Piazza del Duomo a Pisa, ottenuto dal laser scanner Riegl LMS Z420i in dotazione alla Sede di Topografia e Fotogrammetria
del Dipartimento di Ingegneria Civile dell’Università di Pisa. Per la realizzazione di tale rilievo è stata predisposta una poligonale di appoggio locale, alla quale sono stati riferiti i target piani disposti nell’intera area di scansione. Rispetto questi target sono state unite le dieci scansioni necessarie a coprire l’intero fronte dell’edificio. Per una verifica del rilievo ottenuto è stato progettato un rilievo fotogrammetrico del portale principale di ingresso del Camposanto, che determinerà l’utilizzabilità o meno del modello tridimensionale, ottenuto dal laser, a fini di restauro
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
Human eccrine sweat glands: an immunohistochemical study
No full textHuman eccrine sweat glands: an immunohistochemical stud
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