1,720,959 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
Observations on the Resolution and Tones in First Order Noise Shaping Time-to-Digital Converters
No full textIn this paper we report some observations on the resolution and tones of First Order Noise Shaping Local-Oscillator Based Time-to-Digital Converters (LO TDCs). We describe the architecture and governing equations of the LO TDC. We introduce equations to predict the resolution of the system LO TDC plus moving average filter and the frequency and amplitude of the largest amplitude tone in the spectrum of the TDC output when the input is constant. We describe briefly the block diagrams of a Matlab model of the LO TDC and its implementation on an FPGA. Finally, we compare analytical predictions of the amplitude and frequency of the largest tone in the spectrum with simulations and experimental results. The prediction of the powers and positions of the tones in the TDC output spectrum is fundamental for the design of the system in which the TDC has to be used. © 2011 IEEE
First Order Shaping Local-Oscillator Based Time-to-Digital Converter
No full textThis paper presents a First Order Noise Shaping Local-Oscillator Based Time-to-Digital Converter (LO TDC). The architecture and governing equations of the LO TDC are described. In order to show the effect of noise shaping on the resolution of the TDC, the system LO TDC plus moving average filter is introduced. An equation to predict the resolution of the system LO TDC plus filter is given. Then, the Matlab model of the system LO TDC plus filter is illustrated briefly, and some example of simulated input-output characteristics are shown. Afterwards, the implementation of the LO TDC on an FPGA is described. A comparison between the predicted, simulated and measured values of the resolution of the system LO TDC plus filter is reported. Finally, we show spectra of the output signals of the LO TDC from experiments and simulations. ©2010 IEEE
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
System and transistor level analysis of an 8-taps FFE 10Gbps serial link transmitter with realistic channels and supply parasitics
No full textCircuit/system level simulations are employed to assess the performance of a 10 Gbps transmitter for a high speed serial interface to be used in automotive Electronic Control Units. The transmitter has been designed in a standard 28 nm technology and features feed-forward equalization (FFE) with 8 taps (1 pre- and 6 post-cursors), whose strength is programmable with 16 discretization steps. It is shown that the parasitic inductance on the supply terminals degrades the performance in
terms of jitter and SNR and tends to hamper the benefits of FFE. When the value of these inductances is minimized, system-level models of the transmitter reproduce quite well time-consuming transistor-level simulations
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
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