1,721,035 research outputs found
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
L’approccio previsionale all’affidabilità : esempi di calcolo del tasso di guasto in ambito ICT
No full textLa corretta valutazione del tasso di guasto, come pure il calcolo del tempo medio al guasto e del tempo medio tra guasti, necessitano la conoscenza dell’ambiente operativo in cui il componente o il sistema andrà ad operare. Questo aspetto riveste un ruolo di fondamentale importanza ai fini di una valutazione delle prestazioni di affidabilità, come peraltro ben evidenziato nella stessa definizione di affidabilità data dalla normativa.The correct evaluation of the failure rate, as well as the calculation of the mean time to failure and the mean time between failures, require knowledge of the environment in which the component or the system will operate. This is a key point for the evaluation of reliability performance, as also shown in the definition of reliability given by the standard
L’importanza degli strumenti nell’analisi della sicurezza dei sistemi industriali: Brevi note relative alla tecnica FTA
No full textL’analisi della sicurezza dei sistemi industriali è una procedura atta a ridurre eventi che comportano rischi alle persone o all’ambiente, nonché per contribuire alla protezione di sistemi e impianti, riducendone la frequenza.
Una delle tecniche più comunemente utilizzate per valutare la probabilità di guasto dei sistemi industriali è l’analisi degli alberi delle avarie (FTA – Fault Tree Analysis).The safety analysis of industrial systems is a procedure to reduce occurrences involving risks to people or the environment and contribute to the protection of systems and installations, reducing their frequency.
The most commonly employed technique to assess the probability of failure of industrial systems is faulttree analysis (FTA)
Design and implementation of a on-board device for photovoltaic panels monitoring
No full textNowadays the world energy infrastructure is subjected to a progressive transformation. In fact it is already possible to notice the growing number of distributed small
generation units, based on different technologies, directly connected to the power grid. At present the energy that can be produced by the sun and wind seem to be the most promising renewable energy sources. The use of the solar energy requires to optimize the efficiency of the converting chain and to maintain the performances of the system. These requirements highlight the
need to equip photovoltaic (PV) plants with efficient condition monitoring tools. In this paper a hardware solution for monitoring system that allows implementing algorithm devoted
to check the dependability of the PV panels and to improve the overall system efficiency is presented
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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