1,720,965 research outputs found
A Smart City Application: A Fully Controlled Street Lighting System Isle Based on Raspberry-Pi Card, a ZigBee Sensor Network and WiMAX
No full textA smart city application has been realized and tested. It is a fully remote controlled isle of lamp posts based on new technologies. It has been designed and organized in different hierarchical layers, which perform local activities to physically control the lamp posts and transmit information with another for remote control. Locally, each lamp post uses an electronic card for management and a ZigBee tlc network transmits data to a central control unit, which manages the whole isle. The central unit is realized with a Raspberry-Pi control card due to its good computing performance at very low price. Finally, a WiMAX connection was tested and used to remotely control the smart grid, thus overcoming the distance limitations of commercial Wi-Fi networks. The isle has been realized and tested for some months in the fiel
Scheda di acquisizione multi piattaforma per misurazioni certificate di power quality
No full textNell'ambito della conservazione dei beni culturali l'accumulo di polveri costituisce un grave problema. Le sue interazioni con i manufatti sono molteplici e i danni che essa può provocare sono notevoli
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
A Multi-Platform Data Acquisition Device for Power Quality Metrological Certification
No full textA Data Acquisition USB Device has been realized to
be used in Power Quality monitoring activities. The adopted
solution allows to perform 8 channel simultaneous data
acquisition with external certified time and voltage references,
working at 499 samples per 50 Hz period. The self-powered USB
interface combined to multiplatform FTDI Virtual ComPort
drivers yields a simple-to-use and scalable device; it can be driven
simply sending and receiving data over High Speed RS232 virtual
interfaces, without requiring any advanced programming skill.
The virtual serial communication makes data acquisition software
portable over many platforms, regardless development
environment and programming language. The proposed device
has been tested with custom software written in C# and VB6, than
in LabView and MatLab environment
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
NUOVO SISTEMA PER IL MONITORAGGIO GEOGRAFICO DELLA POWER QUALITY
No full textLa crescente diffusione delle energie rinnovabili (generazione distribuita) e di dispositivi non lineari (inverter, alimentatori switching, ecc...) sta causando problemi significativi sulla rete elettrica, producendo delle variazioni rispetto alle forme d’onda ideali di tensioni e correnti. Ciò può determinare il malfunzionamento, l’accorciamento del tempo di vita o addirittura la rottura di molti apparati sensibili, quindi diventa sempre più indispensabile lo studio della qualità dell’energia elettrica. Alla base di un tale studio è necessaria una prima fase di monitoraggio in modo da raccogliere sufficienti informazioni per poi individuare possibili soluzioni.
Inoltre, è interessante osservare come queste variazioni e/o altri eventi transitori si propagano sulla rete elettrica nazionale, ecco quindi la necessità di un monitoraggio distribuito geograficamente.
In questo articolo viene mostrato il sistema di monitoraggio della PQ (Power Quality) sviluppato nel Laboratorio di Misure Elettriche ed Elettroniche dell’Università degli Studi “Roma Tre” ed attualmente in uso sul territorio di Roma
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