1,721,140 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
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Full text linkVariations 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
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
SDR-Based Ground Target for Identification and Tracking through Satellite SAR Systems
No full textThis paper presents a new approach to integrate communication process in satellite synthetic aperture radar (SAR), without the necessity of updates in systems already on-air, through a software defined radio (SDR) based ground target. Nowadays, in the actual context of fast technology evolution, wireless communication integration is becoming popular in commercial and research domains, and from this point of view, SAR is the perfect candidate because of its appeal that increases constantly. Through the flexibility and versatility of SDR technology, a novel ground target is proposed in order to emulate the ground backscattering of SAR waveforms with the implementation of a coding technique that allows the integration of a transparent wireless communication link in SAR devices already on-air, enabling the classic SAR image process without interferences but also the simultaneous ground target identification and tracking. In this paper, the features and the design strategies of the SDR-based ground target are described followed by the presentation of the prototype
Active Temperature Balance Control of Parallel-Connected SiC Power MOSFETs
No full textSiC MOSFETs are rapidly replacing Si-based devices in high-power applications due to their superior electrical and thermal characteristics. Nevertheless, due to fabrication constraints, commercial SiC dies have lower current ratings compared to their silicon counterparts. As a result, multiple SiC MOSFETs must be connected in parallel for high-current applications. This inevitably results in current and thermal imbalances among the devices due to asymmetric layouts and parameter variations. To address this issue, this work proposes an active thermal balance control strategy that monitors the case temperatures of parallel-connected SiC MOSFETs and individually adjusts the duty cycle of each switch in a closed-loop manner to ensure the thermal balance among all devices. The proposed approach allows full exploitation of each device without the need to introduce current derating, typically required in parallel-operating switching converters. Experimental results are presented, validating the proposed technique
SDR SAR Target: Corner Reflector and Communication
No full textThis paper presents a novel target, based on software-defined radio (SDR) technology, that allows the support of remote sensing processes and enables a transparent communication link in synthetic aperture radar (SAR) systems. Nowadays the integration of communication services in technologies that are not developed for this purpose can be an interesting solution for the increasing communication demand. The novel target acts in two different ways for SAR systems: as software-defined corner reflector (SDCR) for localization and calibration support, but also as SAR target to integrate a transparent communication link for target identification and tracking
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