1,721,055 research outputs found
Linear Universal Decoding for Compound Channels
No full textOver discrete memoryless channels (DMC), linear decoders (maximizing additive metrics) afford several nice properties. In particular, if suitable encoders are employed, the use of decoding algorithms with manageable complexities is permitted. For a compound DMC, decoders that perform well without the channel's knowledge are required in order to achieve capacity. Several such decoders have been studied in the literature, however, there is no such known decoder which is linear. Hence, the problem of finding linear decoders achieving capacity for compound DMC is addressed, and it is shown that under minor concessions, such decoders exist and can be constructed. A geometric method based on the very noisy transformation is developed and used to solve this problem.National Science Foundation (U.S.) (Grant CIF-0830100
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
Inference of DNA Community Interactions in Hi-C Contact Data
No full textThe Poisson model community detection algorithm [1] is applied to Hi-C contact data. Hi-C
contact data is preprocessed in various ways in attempt to identify communities at various
distances relative to each other. We nd the following about location of communities within
chromosomes in subsection of human chromosome 14 in cell line GM06990: 1) we are able
to detect communities that are relatively close in the 1-D strand of DNA, where are large
number of interactions exist between nodes 2) we are also able to detect communities of
nodes that are separated by a larger distance 3) the vast majority and most dominant communities
are among nodes in 1-D proximity. Without preprocessing our data, we nd k=6
communities, the same number as Cabreros et. al. [3]. By eliminating low contact interactions,
the number of communities drops to 5. By eliminating interactions along the main
diagonal (1-D proximity), we detect 3 communities. Additionally, we veri ed that similar
behavior is mostly observable when applying the same techniques to mouse chromosomes
1-5. We do nd, however, that changing the restriction enzyme used to create the Hi-C
data can substantively a ect clustering results. This could be because any variability in
the main band can greatly skew the clustering. Most notably, however, removing the main
diagonal band, up to a certain point, actually makes detecting more communities possible.
Finally, we adapted the adjusted mutual information score to compare our clustering results
and nd that while clustering results on the preprocessed data seem relatively similar even
though the preprocessing techniques removed opposite nodes. The results from unpreprocessed
data, however, has a low adjusted mutual information score with all other clustering
results. While the results produced by CD are for the most part intuitive, some are di cult
to explain and may require new theories and understandings about the 3D structure of
DNA
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
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