1,720,955 research outputs found
3-D visualization and animation of architectonic elements for urban recovery and re-qualification
Full text linkThe disciplines of building recovery and urban re-qualification may draw big advantages from laser scanners, which can achieve 3-D models with very short post-processing times.
The purpose of this study is to survey and acquire a solid model of historical architectonic faces and single decorative elements, using different kinds of laser scanners in order to evaluate every single instrument’s performance, relevant to the extension of the survey area.
In practice, a scanner using the “time of flight” technology was tested on entire faces and a triangulation scanner was tested on the small single element acquisition.
The trials have put in evidence that a time-of-flight instrument, for instance working 50-100 meters far from the target, can in short time acquire large surfaces.
The reproduced model can be mapped with images and is accurate enough to plan a recovery project.
Through digitalization it can also provide with the typical architectonic design and urban decline survey print-outs.
The results of short distance scans, on the other hand, show a quality of survey optimal for applications of physical reconstruction of small decorative elements.
The possibility to obtain material copies of decorative elements can be a major support for recovery projects where the substitution of degraded parts is foreseen.
The possibility of utilization of different software for processing data acquired with laser scanner allowed for an optimization of the data processing itself.
It is to be reminded that, at the present stage, software development for such applications is only effective with very powerful hardware and expert users.
The article introduces specific cases that show the results exposed
Acquisizione di immagini da microscopia laser mediante figure di Lissajous
No full textA new equipment was designed to acquire images of a sample in a non-linear scanning microscope. The sample is scanned by means of modified Lissajous trajectories, allowing best performance of mechanical system and reduced acquisition time
LA MAPPATURA DEL MODELLO 3D DI UNA SUPERFICIE ARCHITETTONICA: PALAZZO BEVILACQUA A BOLOGNA
Full text linkLo studio svolto si occupa di valutare l’utilizzo della tecnica di laser scanning nelle applicazioni
legate al recupero edilizio, cercando di mettere a fuoco i vantaggi e le problematiche ancora
irrisolte.
La facciata di Palazzo Bevilacqua, un edificio quattrocentesco situato all’interno del centro storico
della città di Bologna, è stata utilizzata per la sperimentazione essendo costituita completamente di
pietra arenaria, materiale particolarmente soggetto all’aggressione da parte degli agenti atmosferici
ed inquinanti con tendenza a polverizzarsi sotto la crosta nera gessosa.
Obiettivo di questo lavoro è la costruzione di modelli superficiali mappati in modo da facilitare gli
operatori del restauro ad ottenere con relativa semplicità una mappatura tridimensionale del degrado
nonché una prima analisi del materiale di costruzione.
Si è realizzato inoltre un confronto tra i metodi ed i procedimenti di mappatura in diversi ambienti,
partendo dallo stesso dato in termini di nuvole di punti e da dati omogenei per quanto riguarda le
elaborazioni di post- processing.
Sono stati esaminati differenti programmi che permettono la mappatura di modelli tridimensionali
attraverso l’utilizzo di immagini digitali; alcuni di questi impiegano il metodo del riconoscimento di
punti omologhi tra il modello e l’immagine, altri creano materiali mappati applicando le immagini
in aree selezionate del modello attraverso vari sistemi di coordinate; altri ancora hanno la necessità
di partire dalla nuvola di punti grezza per poi sviluppare al loro interno tutto il procedimento di
post- processing fino a ottenere la mappatura desiderata.This study gives evidences of practical usage of the laser scanning techniques applied to building
restoration, trying to show both advantages and problems still unsolved.
The facade of Bevilacqua Palace, a fourteenth century building located in the city centre of
Bologna, has been used for application tests. The facade is completely built with sandstone, a
material particularly weathered by atmospheric agents and environmental pollution.
Scope of the work is to build up surface models mapped in a way to help restoration operators to
easily get a 3D mapping of the material degradation and a preliminary analysis of material
conditions.
A comparison has been carried out with different mapping procedures, using same starting data (in
terms of clouds of points) and homogeneous data regarding post-processing elaborations.
Different programs for 3D mapping models using digital images have been analysed. Some of those
use method of recognising corresponding points between the model and the image, other create
mapped objects using images in selected areas of the model with various systems of coordinates,
other programs need to start from a preliminary cloud of points and then developing a post-processing
internal procedure they arrive to the final mapping
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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