1,721,086 research outputs found
Leptonic and hadronic modeling of -ray blazars
No full textCerruti, Matteo. (2013). Leptonic and hadronic modeling of -ray blazars. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/158176
FVTD-based analysis of brain stroke response in microwave imaging systems
No full textIn this paper, a numerical analysis of the electromagnetic response of brain strokes when illuminated by the incident radiation used in microwave imaging systems is performed. In particular, a two dimensional simulator based on the Finite-Volume Time-Domain (FVTD) method is used in order to efficiently solve the forward scattering problem in the presence of complex structures. Moreover, an anatomically realistic head phantom, obtained from Magnetic-Resonance images, is employed for simulating the biomedical configuration. The electromagnetic field propagation inside the head tissues is investigated and the effects of the presence of the stroke on the scattered field (collected at the measurement points) are evaluated
A hybrid FVTD-PO approach for the characterization of antennas on large platforms in naval applications
No full textIn this paper, a new hybrid method based on the combination of the Finite-Volume Time-Domain (FVTD) method with the physical optics (PO) approximation is presented. The aim is to characterize antennas mounted on or near large platforms such as in integrated masts. The basic idea is to subdivide the scattering domain into two parts. The first one, namely the 'FVTD region' is analyzed by using a full-wave solver for the Maxwell equations. The second one, namely the 'PO region' is described in terms of the PO approximation. Some preliminary results are reported in order to show the effectiveness of the proposed approach
A radar cross section and radar performance evaluation tool for the early stage ship design (ESSD) phase
No full textIn this paper, an integrated tool for the evaluation of the radar cross section and radar performance is proposed. The approach considers input data obtained by a commercial software for 3D modeling (Rhinoceros). This integration is part of a wider numerical architecture, developed by Orizzonte Sistemi Navali S.p.A. and called ASNET (Application System for Naval ship design Evaluation and Testing), which also comprises an Operational Evaluation Model and a Ship Synthesis Model aimed at evaluating the Measure of Effectiveness of a certain ship design when different naval tasks have to be complied with. This way, ship design characteristics are linked to operational aspects with the aim of supporting the ship design requirements' phase. A test case, in which (i) the RCS of a marine target model is assessed and (ii) the performance of a radar system for the detection of low-elevation targets during the early stage ship design are evaluated, is reported
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
A trainingless WiFi fingerprint positioning approach over mobile devices
No full textIndoor localization of targets by using electromagnetic waves has attracted a lot of attention in the last few years. Thanks to the wide availability of electromagnetic sources deployed for various applications (e.g., WiFi), nowadays it is possible to perform this task by using low-cost mobile devices, such as smartphones. To this end, in order to achieve high positioning accuracy and reduce the computational resources used in the position estimation, fingerprinting approaches are usually employed. However, in this case, a time-consuming training phase, where a great number of measurements must be performed, is needed. In this letter, a novel approach, where the training data are obtained by means of finite-difference time-domain (FDTD) simulations of the electromagnetic propagation in the considered scenario, is presented. The performances of the method are assessed by means of experimental results in a real scenario
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
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