1,720,959 research outputs found
Validation of electromagnetic numerical simulations through measurements for an efficient deployment of complex systems
Full text linkA proper use of electromagnetic numerical simulations can lead to an efficient equipment integration and consequent successful deployment of complex systems and stations. In this paper, the level of accuracy attainable with modern numerical methods is discussed as a consequence of measurement campaign performed in complex systems and environments
SCELTA DEFINITIVA DELLE SPECIFICHE TECNICO FUNZIONALI DI UN RADAR OTH
No full textRapporto finale di ricerc
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 Remotely Distributed Ray Tracing for the Analysis of Electromagnetic Propagation in Complex Indoor and Outdoor Environments
No full textAn Efficient Ray-Tracing Approach for the Isolation Assessment of Co-Located Base Station Antennas at mmWave
Full text linkNumerical evaluation and/or measurement campaigns are currently the only means of evaluating the isolation between antennas; in the former case, the simulation time and computational resources necessary can be burdensome, whereas the latter requires several weeks of work to be completed. Within this context, this article aims at presenting an effective methodology for the evaluation of the isolation between co-located antennas in a rapid computational time. The proposed method is based on the near-field equivalent representation of real antennas (Tx and Rx) combined with the ray tracing method for evaluating the field re-radiated by the source antenna on the receiver, hence the received power. The procedure is general and suitable to any type of antenna with any configuration and number of radiation elements. Moreover, antenna mechanical and electrical details are not needed, since only near field information is needed. Finally, it considers the presence of the support structure and surrounding obstacles. The methodology has been validated by full-wave simulations and measurements, yielding consistent and accurate results with an error that is below 2 dB in most of the cases, up to 6 dB for very low coupling values, indicating a high level of accuracy and reliability
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