1,721,001 research outputs found
Fotogrammetria per l'archeologia
No full textVolume GROMA 2 . In profondità senza scavare- Metodologie di indagine non invasiva e diagnostica per l'archeologia.Uno ei capitoli sul rilievo per l'archeologia; in particolare si tratta della Fotogrammetria applicata all'archeologia
Ortorettifica di immagini satellitari IKONOS della costa del Molise attraverso DLT
Full text linkOrtorettifica di immagini satellitari IKONOS della costa del Molise attraverso DL
GNSS (Global Navigation Satellite Suystem)
No full textIn profondità senza scavare. Metodologie non invasive e diagnostica per l'archeologia.Metodi e strumenti per il rilievo applicato all'archeologia; in particolare il sistema GNSS per l'archeologia
Accuracy and precision vs software and different conditions using Italian GPS fiducial network (IGFN) data
No full textAs well known standard deviation estimation of GPS baselines (and components) by dedicated software are usually lower than the "real" accuracy. Assuming as total errors the addition of stochastic and systematic components, GPS software solution for the related incertitude takes into account mainly the stochastic component. Systematical errors are not estimable by observable but can be reduced only by models (or by calibration in the case of measure instruments).
For these reasons, accuracy and precision are two different entities and sometime using GPS it is possible to obtain good results in terms of RMS, but not accurate ones. The baseline accuracy is dependent from many factors such as: baseline length, constellation, windows time observation, ionospheric and tropospheric models, etc. All software performs data processing using models and algorithms and, despite of the most of cases models are the same, the algorithm that applies the model could be different (different numerical methods for computation etc...). Not only, frequently the data processing philosophy used by different software is different and these different characteristics are probably derived by different initial requirements. Therefore, if we decide to use GPS for monitoring and particularly for monitoring very small movements the correct approach consists in choosing a software and performs the same data processing procedure for all the surveys. Using that approach all models and all “problems” are evaluated in the same modality and all the results have to be considered “coherent”. Others application do not need these accuracies and if we are interested to decimeter level accuracy these problem are not so evident.
Actually, the international scientific community disposes lots of GPS data processing scientific software and each one is characterized by different peculiarity. The utilization of this software is frequently related to the geography and if GIPSY-OASIS II is very common in USA, BERNESE Software plays a main rule in Europe. Another software that recently has enlarged the number of user both in Europe than in United States is GAMIT but other software as PAGES and Microcosmos are also available.
This work has to be considered as preliminary and only with an enlargement of samples and cases can be more significant.
In this paper the author start with a comparison of two software in different conditions. Naturally the number of parameter that contribute to the solution variability is very large and in this paper only few of these are evaluated. Particularly stability on solution for different windows time observation and for different baseline length have been investigated
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
- …
