1,721,015 research outputs found
Compensazione della Rete Dinamica Nazionale dell’Istituto Geografico Militare Italiano: Procedure e risultati ottenuti dal Gruppo G3
No full textSessione Speciale RD
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
GeoGuard: un nuovo servizio di monitoraggio geodetico per l’osservazione di segnali geodinamici
No full textUtilizzo di ricevitori a basso costo e del software goGPS per il monitoraggio geodetico
No full textI rischi naturali e quelli legati a cedimenti di strutture ed infrastrutture richiedono di attivare sistemi di monitoraggio, al fine di mitigarne gli effetti in termini di costi economici e sicurezza per la
popolazione. Uno dei possibili approcci per controllare tali rischi consiste nella determinazione continua della posizione di un certo insieme di punti e nel fornire un pronto allarme quando viene superata una certa soglia sulla deformazione del sistema complessivo. L’uso di tecniche geodetiche e in particolare di sistemi GPS/GNSS per monitorare le deformazioni è una pratica ormai comune, tipicamente svolta installando una rete di ricevitori di qualità geodetica che garantiscono accuratezze dell’ordine dei millimetri con un giorno di latenza. Di recente è stato studiato l’uso alternativo di dispositivi a più basso costo, mostrando la possibilità di ottenere buoni risultati. In questo lavoro viene valutato anche l’impatto del software utilizzato per l’analisi dati per verificare se sia possibile realizzare un sistema completo a basso costo, sia dal punto di vista hardware che software. A tal fine sono stati svolti una serie di esperimenti di posizionamento relativo processando i dati con differenti pacchetti software. Il principale risultato di questo lavoro può essere riassunto nel fatto che utilizzando un ricevitore GPS a basso costo u-blox e analizzando i dati con il software free e open source goGPS è possibile individuare movimenti dell’ordine di pochi millimetri utilizzando basi corte, ovvero è possibile realizzare un servizio di monitoraggio
Experimental study on low-cost satellite-based geodetic monitoring over short baselines
Full text linkThe use of geodetic techniques, in particular of the global positioning system (GPS), or other global navigation satellite systems (GNSS), for monitoring different kinds of deformations is a common practice. This is typically performed by setting a network of geodetic GPS/GNSS receivers, allowing accuracies in the order of millimeters. The use of lower-cost devices has been recently studied, showing that good results can be achieved. In this paper, the impact of the software used for the data analysis is also investigated to verify whether a fully low-cost monitoring system, i.e., both hardware and software, can be set up. This is done by performing a series of relative positioning experiments in which data are processed by different software packages. The main result is that by using a low-cost u-blox EVK-6T GPS receiver and analyzing its data with free and open-source software, movements of the order of a few millimeters can be detected when a short baseline with daily solutions is used
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
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