1,721,019 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Compatibility of Galileo E1 signals with the Radio-Astronomy band 9
No full textInternational audienceThe current Galileo E1 signal is located in the L-band at the central frequency 1575.42 MHz. Although the useful bandwidth is 32 MHz, its total spectral width is 40.92 MHz, including the secondary lobes, the upper part of its transmitting band being at 1595.88 MHz
Mitigating the impact of GNSS signals in the radio astronomy band 1610.6-1613.8 MHz
No full texthttp://www.ion.org/publications/abstract.cfm?articleID=8014International audienceThe band 1610.6-1613.8 MHz is used by the radio astronomy (RA) community in order to study the spectral line of the Hydroxyl (OH) radical transitions. This radical is considered to be one of the most important lines for the observation of physical phenomena associated with the formation of protostars and the initial stages of star formation. The current ITU recommendation to protect this RA band is to ensure an Equivalent Power-Flux Density (EPFD) lower than -258 dBW/m2/20kHz. Radio Frequency Interference (RFI) has, however, been reported in this band that significantly disturbs the exploitation of OH spectral lines. Examples of these interference are GLONASS L1 signal and Iridium [Monstein and Meyer, 2007; ERC, 1997; Galt, 1991]. In order to be immunized from these sources of disturbance, different antenna or signal processing techniques have been investigated and used by the RA community. Cooperation with GLONASS was also used in order to reach an agreement satisfying both parties. The main reason for GLONASS to provide unwanted interference in the RA band is its close proximity with this band. Although further away from the RA band than GLONASS, Galileo is still relatively close to it (15 MHz only). In particular, the ITU recommendation on the RA band implies a fairly steep slope to the Galileo E1 payload filter, which represents a high constraint for the realization of the payload. Consequently, it might result in imperfect filtering of the signals, potentially leaking in the RA band. It is then interesting to develop a method that could mitigate the effect of GNSS signal in the RA band, in order to ensure that after using this method, the level of the interference PFD is below the ITU recommendation. This is the goal of this paper, which introduces a general method to mitigate GNSS signals (using Code Division Multiple Access (CDMA) technique) from the RA band. In particular, the method is adapted to signals that have an open signal and a restricted signal, with is generally the case for GNSS signals. The method is based on the estimation of the GNSS signal, followed by its subtraction from the incoming signal in order to just leave the RA signal of interest. The paper particularly emphasis the adaptation of this method to the Galileo E1 signal, showing a reduction of approximately 10 dB of the maximum level of the expected Galileo PFD within the RA band
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