1,720,977 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
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
Fully Embedded Ultra-Wideband Multilayer Balun into Organic Packaging Substrate
No full textThis study presents a novel miniaturised ultra-wideband (UWB) multilayer balun embedded into organic packaging substrate of liquid crystal polymer. The broadside coupled stripline structure is adopted in this work to realise UWB performance and TEM mode. The fabricated prototype is self-packaged for electromagnetic shielding, and lightweight, with a small footprint. The proposed balun design achieves excellent amplitude and phase balances within the entire bandwidth, centred at 6.2 GHz. Simulation and measurement results show very good agreement.</p
Advanced RF/microwave filtering circuits for wireless communications and radar applications.
Full text linkThe recent rapid development in modern communication systems has presented some
constraints caused by the introduced noises, as well as further requirements of low costs
and miniature designs. Such noises are overcome using efficient designs of filtering devices
which are essential components in many satellite, radar and mobile communication
systems. As a result, balanced or differential filtering components have recently received
increasing attention. A wideband microstrip balanced bandpass filter based on modified
stub line approach is presented in here. The proposed idea of extended transmission lines
(TLs) at the input and output (I/O) ports enables for very good stopband rejection and
common-mode suppression.
On the other hand, the recently introduced multilayer liquid crystal polymer (LCP) material
and fabrication technique are exclusively applied in this work for adapting the potential
solutions offered within. Therefore, a comprehensive in-house fabrication process has been
developed and extensively illustrated in this thesis starting from mask preparation covering
the entire procedure up to producing the final piece of output. As a demonstrator of the
potential capability of multilayer LCP technology, a novel miniaturized ultra-wideband
(UWB) balun with self-packaging is introduced in this study. The broadside coupled
stripline structure is adopted in this work to realize UWB performance and TEM mode
which results in excellent amplitude and phase balances.
In turn, a novel compact UWB multilayer balanced bandpass filter using LCP technology is
also presented in this thesis. The design utilizes the transversal signal-interference concept
for realizing an outstanding common-mode suppression while constructed in a stripline
configuration. All of the designs covered in this thesis are initially simulated using CAD
tools to be then validated by measurements of fabricated prototypes
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
UWB Balanced BPF Using a Low-Cost LCP Bonded Multilayer PCB Technology
No full textThis paper presents a new miniaturized ultrawideband (UWB) multilayer balanced bandpass filter (BPF) using the liquid-crystal polymer technology. The design is based on the use of two baluns and uses the transversal signal-interference concept for the realization of differential-mode (DM) passband and common-mode (CM) stopband. The broadside coupled stripline structure is adopted in this paper to realize UWB performances and pure TEM mode. The fabricated prototype is self-packaged, light in weight, and cost effective with a small footprint. The demonstrated balanced BPF achieves the excellent DM and CM responses within the entire bandwidth, centered at 6.85 GHz. The simulation and measurement results show good agreement.</p
Wideband Differential-Mode Bandpass Filters With Stopband and Common-Mode Suppression
Full text linkThis letter presents wideband differential-mode(DM) bandpass filters (BPFs) designed on a microstrip line forultrawideband (UWB) applications. The proposed design is basedon an optimized branch-line structure with extended transmissionlines (TLs). An enhanced performance can be obtained using avery simple design approach. The introduced TLs can be usedfor improving the DM stopband response by introducing multipletransmission zeros (TZs) at the lower and upper stopband. Thecommon-mode rejection level can also achieve around 40 dBwithin the band of interest. The proposed filters are fabricatedfor experimental verification. The predicted and measured resultsshow a very good agreement
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