1,720,962 research outputs found
Sistemi informativi geografici per l’ambiente
No full textUn sistema informativo geografico, pi`u comunemente noto con l’espressione anglosassone
Geographic Information System (GIS), ha lo scopo di acquisire, gestire e analizzare dati in un
contesto spaziale. Esso rappresenta un valido supporto alla pianificazione territoriale e alla gestione
di informazioni quali-quantitative complesse caratterizzate da una componente geografica.
L’esigenza di condividere ed utilizzare l’informazione geografica ed il crescente sviluppo delle tecnologie
di comunicazione, hanno determinato negli ultimi anni l’evoluzione e l’utilizzo dei WebGIS,
ovvero di GIS implementati sul web. Tale strumento rende semplice ed immediata la consultazione
delle informazioni archiviate nel GIS, anche da parte di utenti non specializzati nell’utilizzo di
tecnologie informatiche.
In questo capitolo, vengono presentati gli avanzamenti del GIS integrato in un WebGIS per il
monitoraggio ambientale, gi`a proposto a livello prototipale nell’ambito del Progetto Sviluppi della
Geostatistica multivariata per l’analisi dei dati ambientali nello spazio e nello spazio-tempo realizzato
nell’anno 2011.
Inoltre, dopo aver identificato gli episodi di trasporto di polvere africana, mediante l’analisi delle
traiettorie all’indietro delle masse d’aria provenienti dalle regioni desertiche ed aver verificato
l’esistenza di scenari favorevoli per il trasporto di polveri, avvalendosi delle mappe aerosol e delle
immagini satellitari, si fornirà una quantificazione del contributo netto dovuto agli episodi di polveri
africane
Modelling a Big Data-based Analytical Process: an Aerospace Case Study
No full textIndustry 4.0 experienced a wide range of cutting-edge technologies, including Big Data Analytics (BDA). BDA plays a key role in extracting value from industrial Big Data to uncover hidden patterns, correlations and market trends. In smart manufacturing, it also supports the improvement of operations and production, the reduction of machine downtime, the enhancement of product quality and a more efficient supply chain. When approaching with BDA project, it is important to accurately model and design the entire process for achieving a specific analytical goal. This paper aims to understand how to model a big data-based analytical process within manufacturing environments. To achieve this goal, starting from a theoretical background on standards for modelling analytical processes, the paper proposes the BigDAM (Big Data Analytics Modelling) framework, as an integrated conceptual representation of the key steps to consider in modelling a BDA path. Also, the framework is contextualized within an aerospace case study
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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