1,720,990 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
Relative robustness against process fluctuations of basic building blocks for analog front-end of particle detectors
No full textThe large number of channels (15.7 millions), needed
for the silicon pixel detector under development for the
ALICE ITS, requires a careful study of the statistical
fluctuations of the front-end electronics performance.
By means of classical techniques, such as the
Principal Component Analysis, and of new ones used to
perform a “realistic” worst case analysis, various
configurations of basic CMOS amplifier stages have been
compared to evaluate the relative robustness of their
performance against manufacturing fluctuations.
To validate the simulated results on a significant
statistical sample, a test pattern containing these basic
building blocks has been designed and implemented in a
0.35mm process. In this work we present the theoretical
results, achieved by applying the proposed Worst Case
Analysis technique. The characterisation of the test chip
prototypes is currently in progress
Interfacing a SiPM to a Current-mode Front-end: Effects of the Coupling Inductance
No full textThe design of front-end electronics for SiPM detectors poses some peculiar constraints which call for dedicated architectures that may remarkably differ from the commonly used ones for other solid state detectors. In particular, present day SiPM’s may have a number of microcells as high as 90,000. This may pose serious problems in terms of dynamic range of the output signal, especially when low voltage technologies are employed to implement the FE. Besides that, SiPM’s are inherently high speed devices characterized by large equivalent capacitance CDET. All the above characteristics indicate a current mode architecture as the most suitable one to interface this kind of devices. In the past several different topologies have been proposed in the literature most of them aiming at realizing the lowest possible value of input resistance, Rin, in the perspective of limiting the time constant in = RinCDET associated to the input node of the amplifier, which is usually deemed to be the dominant parameter affecting the dynamic performance of the FE. In this contribution we show that this is not the case in real situations and that there is an optimum range of values for the input resistance in dependence of the particular SiPM and of the interconnection parasitics, thus avoiding the need of realizing arbitrarily low values of input resistance that would also imply unnecessary high power dissipation and additional electronic noise, due to the high bias currents required in the input stage of the preamplifier. The results of the study, performed on a handly 2nd order SiPM model, are confirmed by both circuit simulations on a more accurate 4th order model and by lab experiments on commercially available devices
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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