1,720,977 research outputs found
Study for a novel electromagnetic travel aid for visually impaired people
No full textLa mobilità autonoma per le persone ipovedenti e non vedenti può essere molto
difficile e spesso richiede l'uso di dispositivi di supporto, come il bastone bianco.
Nel corso degli ultimi decenni sono stati proposti numerosi dispositivi elettronici
con lo scopo di fornire al non vedente delle informazioni sull’ambiente circostante
utili alla deambulazione. Ad oggi nessuno di essi soddisfa appieno i requisiti delle
linee guida internazionali definite per gli ETA. Si è pensato quindi di studiare un
ausilio innovativo basato su impulsi elettromagnetici, ancora mai impiegati per
questo scopo. L’attività di ricerca è iniziata con due studi preliminari, sperimentale
e teorico, che hanno confermato le potenzialità dei campi EM sia nel rilevare la
presenza di ostacoli che nel fornire informazioni aggiuntive riguardanti distanza,
materiale e dimensione. E’ stato poi realizzato e testato da un volontario non
vedente un prototipo capace di rilevare tramite un’antenna la presenza di un
ostacolo e avvisare l'utente con allarmi acustici via via più intensi all’avvicinarsi
dell’oggetto. Secondo i feedback dell’utente il sistema è facile da usare e in grado,
a differenza del bastone bianco, di rilevare anche ostacoli sospesi; ha però bisogno
di essere miniaturizzato, velocizzato per avere risposte in tempo reale e dotato
d’interfaccia vibro-tattile. L'attenzione è stata focalizzata sulla progettazione di
nuovi elementi radianti (un’antenna horn e un array di slot planari) caratterizzati
da: -alte frequenze di lavoro e quindi dimensioni ridotte; -banda ultra larga e quindi
alta risoluzione spaziale; -diagramma di radiazione largo sul piano verticale per
proteggere l’utente dai piedi alla testa e stretto sul piano orizzontale per consentire
una scansione manuale o elettronica dell'ambiente. L'array di slot planari risulta la
soluzione migliore perché consente facile integrazione con altri circuiti e linee di
alimentazione, è flessibile e quindi facilmente attaccabile sul bastone, e spiana la
strada per la progettazione di un dispositivo indossabile
An electromagnetic contactless system for respiration monitoring: a survey of research activity in Ancona
No full text
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
The use of the Electromagnetic Technology in Support to Visually Impaired Athletes Runners
No full textBreath detection of humans buried in a homogeneous lossy medium: a simplified analytical model
No full textThe aim of this work is to highlight the paramount importance of the availability of an electromagnetic model for the design of system based on electromagnetic radiation for search and rescue operation of humans buried under different materials as debris, and snowslide. In this contribution the monitoring of the breathing activity of a man buried into a homogeneous lossy medium has been analyzed. The geometry of the scenario and the body have been simplified in order to model the electromagnetic problem of the interaction of the body and impinging field in a closed-form. In spite of the simple formulation the results are satisfactory and show how some a priori important system requirements can be obtained, as for example the most suitable working frequency range. The model is able to predict the sensitiveness in terms of phase and module variations depending on the scenario
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
- …
