1,721,027 research outputs found
Zenith total delay interpolation to support GNSS monitoring of potential precipitations
No full textA useful contribution to atmosphere monitoring may be provided by the analysis of GNSS (Global Navigation Satellite System) signals. The authors have identified a procedure to monitor in space and time the Precipitable Water Vapor (PWV) content on regionally extended and orographically complex area. The starting point of the procedure is the local estimation of Zenith Total Delay (ZTD) on a GNSS Permanent Stations network, observed from existing infrastructures and integrated with Pressure and Temperature data to produce PWV maps. The present paper deals with the identification of the most appropriate technique to interpolate ZTD, to create maps in quick and automatic way for near realtime application, in order to support the monitoring of intense meteorological events. The main difficulties are due to the sparse distribution of data, combined with high resolution and wide computational region. ZTD has been interpolated through the methods implemented in GRASS GIS: Inverse Distance Weighted, Regularized Spline with Tension, Ordinary Kriging and Triangulated Irregular Network
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
Applicazione in GRASS per l’identificazione di aree idonee alla realizzazione di nuovi impianti di itticoltura offshore
No full textLa gestione della fascia costiera è un processo complesso che cerca di integrare lo sfruttamento dell’area con il mantenimento di una buona qualità ambientale. Trattandosi di un problema spaziale complesso può essere ben affrontato mediante strumenti GIS. Questo lavoro presenta un approccio applicato all’itticoltura offshore, sviluppando una procedura con GRASS per l’identificazione delle aree idonee all’installazione di nuovi impianti, applicata al caso della Regione Liguria. La selezione dei siti si è basata sulla definizione di due principali criteri che ne determinano l’idoneità per l’attività proposta (“aree non idonee” e “aree potenzialmente idonee”) e di condizioni concernenti la zona studio. La procedura ha permesso di ottenere la mappa finale con la perimetrazione delle aree idonee, tramite la realizzazione intermedia delle mappe dei criteri. Sono state identificate circa trenta zone idonee lungo la costa ligure, principalmente localizzare a ponente; a levante si trovano quelle di maggiore estensione. La procedura è stata verificata confrontando le aree individuate con la posizione degli impianti già esistenti. I risultati di questo lavoro dimostrano come questa procedura permette di individuare le aree idonee in modo semplice, rapido, efficiente ed efficace. Con opportune modifiche la procedura può essere applicata a qualunque sistema marino costiero e può essere adattata ad altre attività della zona costiera. Questo lavoro è inoltre una solida base per lo sviluppo futuro di un Sistema di Supporto alle Decisioni Spaziali che restituisca scenari alternativi per i portatori di interesse al fine di individuare la migliore scelta decisionale
Towards a full-stack peripheral nerve recording interface: Challenges on integration and possible solutions
Full text linkPeripheral nerve recording interfaces are a new frontier in neuroprosthetic applications. Nevertheless, an integrated medical device offering both electroneurographic (ENG) signal sensing and decoding is still missing. This paper aims to summarize the process of integrating existing technologies into a full-stack recording device. To this end, the system requirements are provided, together with a description of the building blocks that compose a recording interface: electrode, acquisition system, classification algorithm, power and communication units. The core of our contribution is a detailed analysis of the unsolved conflicts which arise during the assembling process, followed by the proposal of a few compromise solutions
Spatial interpolation techniques for near real-time mapping of Pressure and Temperature data
No full textAmong the different techniques for atmosphere monitoring, the GNSS (Global Navigation Satellite
System) can provide an innovative contribution (Bevis et al., 1992; Crespi et al., 2004; Sguerso et al.,
2013, 2015). The Laboratory of Geomatics, Geodesy and GIS of the University of Genoa has identified a
GIS procedure and a simplified physical model to monitor the Precipitable Water Vapour (PWV) content,
using data measured by existing infrastructures. The starting points are local estimations of Zenith Total
Delay (ZTD) from a GNSS Permanent Stations (PSs) network, a Digital Terrain Model (DTM) and local
Pressure (P) and Temperature (T) measurements (Sguerso et al., 2014; Ferrando et al., 2016). The
present paper shows the study of the most appropriate interpolation technique for P and T data to create
PWV maps in a quick, stable and automatic way, to support the monitoring of intense meteorological
events for both a posteriori and near real-time applications. The resulting P and T maps were compared
to meteorological re-analysis, to check the reliability of the simplified physical model. Additionally, the
Regression Kriging (RK) was employed to evaluate the data correlation with elevation and to study the
applicability of the technique
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
Methodological Report on Emergency Surveys for Cultural Heritage
No full textThe management of emergency scenario is a very complex issue, due to the risk of recurrence of the calamity itself. The present work is intended as a methodological report based on the gained professional and scientific experience of the authors, involved in the survey of several Cultural Heritage buildings hit by the earthquakes that afflicted Central Italy in 2016. The examined structures include the Civic Tower in Norcia, the co-cathedral Santa Maria Argentea and the San Salvatore church in Campi di Norcia. The survey campaigns were performed immediately after the aftershocks occurred in the end of October, on behalf of the Italian Ministry that at the time was called of Cultural Heritage and Activities and Tourism (MiBACT), in order to ease the securing of the sites and their restoration. Because of the necessity to provide the survey products as quickly as possible, typical in an emergency situation, particular attention was paid to optimize both the on-site and the post-processing phases, with respect to the required accuracy. In this regard, U.Ph.O. (Unmanned Photogrammetric Office), a tool developed during the Ph.D. thesis work of one of the authors, is particularly useful for the a priori evaluation of the realistic accuracy obtainable during a photogrammetric survey. In the present work, this tool was applied to the San Salvatore Church, taken as case study to check the influence on the photogrammetric products of two of the main planning parameters: the image overlapping and the accuracy in Unmanned Aerial Vehicle (UAV) positioning
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