1,720,959 research outputs found
Ultralight UAV for steep-hill archaeological 3D survey
Full text linkThe role of drones is becoming increasingly important within current 3D survey methodologies. Their flexibility of use and the ability to acquire images from inaccessible viewpoints make them a critical instrument in multiple fields of application at both urban and architectural scales. This success is mainly due to the progressive development of technology, including data acquisition sensors, flight systems, and data processing programs. The Cultural Heritage domain is one with the most widespread and massive applications. Besides, due to the RPAS regulations in Italy, drones less than or equal to 250 g have seen a considerable expansion in use in recent years. The improved quality of the cameras and the recent introduction of flight planning has made them proper for photogrammetric applications. Recent research reports experiments in the architectural and archaeological domains aimed at verifying the metric reliability of the acquired data compared with active instruments. In archaeological surveying, drones can cover large complex areas quickly, minimizing shadow areas concentrated in the crests of walls. The case study presented is the Canossa Castle, a medieval archaeological complex close to Reggio Emilia and extended on a steep hill with rocky spurs. The work describes integrating GNSS, 3D scanners, and ultralight RPAS photogrammetry, gathering multi-scale geometric information. The integration between the different surveying techniques allowed to plan different verification moments on the metrological reliability of the multi-resolution model. Al last, the data acquired made it possible to produce complete architectural and urban representations, improving the knowledge needed to prepare the virtual reconstruction of the entire complex area
Medieval cultural heritage, from 3D survey to data management: the castle of Canossa
No full textIn the cultural heritage knowledge path, the survey process assumes a primary role as a tool to analyze and interpret through bibliographic and iconographic analysis and the study of reality. The case study analyzed in the article is the Castle of
Canossa, the epicenter of some critical events in medieval times. The authors describe the first part of the research, mainly focused on the integrated survey
process between active and passive techniques at architectural and territorial scales. Several geometrical validation steps have been introduced to
verify the reliability of the 3D acquisition and historical reconstruction. The paper highlighted the crucial relationship between territorial heritage and
buildings, laying the groundwork for a more articulated analysis of the entire architectural complex. The final aim is to realize a 3D BIM model
that represent the current and the original architectures in the same type of environment
Digital wood trusses. geometry and parameters/fabrication and monitoring
No full textThis paper aims to demonstrate how to translate features and properties of existing wooden structures about function, performance and aesthetic into BIM objects. This purpose has a double effect: from an operative perspective, the modelling of existing wooden structures is necessary for any structural restoration project, while culturally for the preservation of construction techniques and their transferability in the current design theory. This refers in particular to wooden trusses as compound objects, such as to comply with a single structural and configurative purpose within the built space. The study proves the feasibility of describing the relationship among geometry, material features, construction techniques and simulation of trusses within a BIM environment. From a methodological point of view, starting from a point cloud, the process involves the modelling of beams and trusses, the construction of a library of nodes with parametric geometry drawn from nineteenth-century treatises (also called “wood stereotomy”), the information exchange from the BIM object to structural simulation environment. Moreover, there is the development of a parametric relation structure, which enables the creation of cutting parameters of the truss’s structural components. The case study from which the system is obtained is the covering system of the Church of the Eremitani, which hosts a so-called revolutionary covering system by a fourteenth-century monk, Giovanni degli Eremitani
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
Le opportunità fornite dai nuovi strumenti digitali = The opportunities of the new digital tools
No full textQuesto saggio, tratta la rappresentazione delle
città focalizzandosi sulle trasformazioni storiche
e si affida agli strumenti di scansione digitale,
alla modellazione 3D e alle tecnologie di Realtà
Aumentata (AR). Il materiale trattato proviene
da un progetto intitolato Visualizing Venice, una
cooperazione internazionale multi-istituzionale
che da poco tempo è passata a Visualizing Cities.
La sfida principale di Visualizing Cities è descrivere
in maniera digitale come le città - con le loro
architetture - evolvano e cambiano nel tempo,
utilizzando modelli digitale 4D interoperabili,
collegati a fonti esterne documentali
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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