1,721,088 research outputs found
Monitoring system using low cost GNSS sensors: first experiments and performance evaluation
Full text linkThis work aims to assess the possibility to use a low cost GNSS instrumentation for structural
monitoring purposes. Under the assumption that about one centimeter can be the magnitude of
the displacements that we aim to detect, several instrumentations were compared at different
baseline distances. All the tests have been performed considering one week of observations.
Different observing session time spans have been considered, ranging from 1 hour to 24 hours.
Tests demonstrate that by using a single frequency receiver is not possible to achieve the
requested precision for baselines longer than a km, at least if observing sessions shorter than 6
hours are needed. Nevertheless, for a baseline within a hundred meters is possible to achieve
effective precisions by using a couple of low cost stations also for observing sessions of one
hour. The only configuration which does not respect such performances is the one using the
default "patch" antennas that we discourage for precision purposes
L’uso di tecnologie GNSS a basso costo per applicazioni di monitoraggio e posizionamento di precisione (stato dell’arte e prospettive di impiego)
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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
Unconventional methods for offshore subsidence monitoring
No full textGeo-mechanical modelling and field measurements proved that the subsidence bowl could extend several km from the production sites. Many methods are available to monitor onshore subsidence, such as spirit levelling, permanent or semi-permanent GNSS, extensometers, tiltmeter arrays and SAR. As for offshore Oil and Gas production, these methods are not applicable, with exception of tiltmeter arrays. Monitoring of subsidence in offshore environments is a topic of great interest and in this poster an overview of recently published unconventional methods are shown
Impact of different GNSS data processing approaches (precise point positioning vs differenced approach) and different scientific software packages on the solutions for displacement detection
No full textGNSS technology is one of the most useful techniques for displacements monitoring. Thanks to the time series given by permanent stations very precise and reliable results are achievable. The most usual approach for the GNSS data processing is the “differencing approach” which provides very accurate results and has been widely tested in the last decades. Many software allow the calculation of GNSS data through differenced approaches, someone are commercial software and some other are scientific packages such as Bernese or GAMIT.
Precise Point Positioning (PPP) is a different technique which allows the estimation of the absolute coordinates of a single GNSS receiver without differencing observables. The PPP technique has proved to give coordinates at the same precision level obtainable through the classic differencing approach, at least if considering 24 hours data files and distances between the stations of several tens of km, that is the case of offshore permanent stations.
The use of different strategies, algorithms and software for the GNSS processing should has some impact on the monitoring results. Therefore, the purpose of the future research is to compare different scientific software packages, which use different approaches and boundary conditions, and analyze the obtained accuracies. Tests will be performed basing on dataset acquired by a GNSS monitoring station located on an offshore platform
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
La Rete geodetica costiera integrata per la gestione della costa
No full textUna conoscenza approfondita dell’assetto morfologico del territorio è essenziale per il supporto alle politiche di difesa della costa. Varie criticità legate alle reti preesistenti rafforzano l’importanza di un potenziamento della Rete Geodetica Costiera e la sua estensione a scala regionale, fino alla realizzazione di una rete geodetica integrata regionale (Geodetic Integrated Network - GIN). Tale rete potrà garantire il necessario supporto alla conoscenza dell’assetto morfologico del territorio
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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