1,720,973 research outputs found
Implementation of Arithmetic Operations in the Residue Numeral System
No full textTo improve the performance of computer systems, special number systems can be used, for example, the residue numeral system (RNS). Replacing integers with their values modulo several pairwise coprime integers (called the moduli) can significantly reduce the complexity of arithmetic operations. However, the different way of representing numbers makes it difficult to use RNS in practice. For example, integers represented in a positional numeral system need to be quickly converted to RNS and vice versa. In addition, the implementation of computing devices operating in the RNS must also take into account the peculiarities of representing numbers as residuals on coprime bases. In this article, we look at the various structures of computing devices in RNS. In particular, we present the arithmetic operations of addition modulo and give examples of adders
Soft decoding based on ordered subsets of verification equations of turbo-productive codes
No full textMethods of soft decoding of cascade code constructions based on the schemes-products of linear block codes (Turbo Product Codes) are considered. An approach is being developed based on the iterative exchange of soft solutions between block codes constituting a cascade design. It is shown that a sequential execution of procedures for the formation of ordered subsets of test equations and the logarithms estimation of a likelihood ratio allows decoding of turbo-productive codes according to the criterion of minimizing the erroneous reception of code symbols
Soft decoding based on ordered subsets of verification equations of turbo-productive codes
No full textMethods of soft decoding of cascade code constructions based on the schemes-products of linear block codes (Turbo Product Codes) are considered. An approach is being developed based on the iterative exchange of soft solutions between block codes constituting a cascade design. It is shown that a sequential execution of procedures for the formation of ordered subsets of test equations and the logarithms estimation of a likelihood ratio allows decoding of turbo-productive codes according to the criterion of minimizing the erroneous reception of code symbols
Generators of pseudorandom sequence with multilevel function of correlation
No full textThe algebraic approach to the formation of large ensembles of discrete signals with a multilevel correlation function, which is based on the section of cyclic orbits of group codes, is investigated. The number and magnitude of the side lobe levels of the correlation function of the sequences being formed, as well as the power of the ensemble of signals, are determined by the distance and structural properties of the polynomial rings over the final fields. Proposals are being developed for the hardware implementation of discrete-signal-generating devices with a multi-level correlation function using a chain of shift registers with linear feedback
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
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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