1,720,958 research outputs found
Entropy network fusion
No full textThanks to the continual development of technology, a massive amount of data is now being produced on a daily basis. Because of this, new methods for analysis are needed, particularly ones that can analyse multiple datasets on the same set of objects. This is especially relevant in systems biology, where different datasets probe different aspects of the same underlying system. A popular and widely used method to analyse datasets is to transform the data into networks. Networks help visualise and quantify connections between samples, revealing structure and information that may not be visible at first, hence the popularity of their use, particularly in the analysis of biological systems. Entropy Network Fusion (ENF) is a new methodology for fusing, or combining, together multiple networks on the same set of objects (nodes) into one single output network. Itworks by finding a solution (network) whose clustering structure is as close as possible to the clustering structure of all the given input networks, using information-theoretic entropy as a guiding principle. ENF is designed with a level of generality, such that it is not restricted to any specific type of data, giving it a wide range of applications. We tested our methodology on five cancer sets and compared the performance to Similarity Network Fusion, a state-of-the-art network fusion algorithm. Whilst SNF may be a faster method, the output from ENF is significantly better in terms of performance. We then further developed an approximate version of our algorithm, approximate Entropy Network Fusion (aENF), which is significantly faster computationally for larger networks, further increasing its range of application
From Farey Fractions to the Klein Quartic and beyond
No full textIn his 1878/79 paper "Ueber die transformation siebenter ordnung der elliptischen functionen", Klein produced his famous 14-sided polygon representing the Klein quartic, his Riemann surface of genus 3 which has PSL(2,7) as its automorphism group. The construction and method of side pairings are fairly complicated. By considering the Farey map modulo 7 we show how to obtain a fundamental polygon for Klein's surface using arithmetic. Now the side pairings are immediate and essentially the same as in Klein's paper. We also extend this idea from 7 to 11 as Klein attempted to do in his follow up paper "Ueber die transformation elfter ordnung der elliptischen functionen", in 1879
From Farey fractions to the Klein quartic and beyond
No full textIn a paper published in 1878/79 Klein produced his famous 14-sided polygon representing the Klein quartic, his Riemann surface of genus 3 which has PSL(2, 7) as its automorphism group. The construction and method of side pairings are fairly complicated. By considering the Farey map modulo 7 we show how to obtain a fundamental polygon for Klein’s surface using arithmetic. Now the side pairings are immediate and essentially the same as in Klein’s paper. We also extend his work from 7 to 11 as Klein also did in a follow-up paper of 1879
From Farey fractions to the Klein quartic and beyond
No full textIn a paper published in 1878/79 Klein produced his famous 14-sided polygon representing the Klein quartic, his Riemann surface of genus 3 which has PSL(2, 7) as its automorphism group. The construction and method of side pairings are fairly complicated.By considering the Farey map modulo 7 we show how to obtain a fundamental polygonfor Klein’s surface using arithmetic. Now the side pairings are immediate and essentiallythe same as in Klein’s paper. We also extend his work from 7 to 11 as Klein also did in afollow-up paper of 187
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
Strudwick, James W.
No full textSee entry in Hale County volume 1, page 1: https://digital.archives.alabama.gov/digital/collection/voter/id/143
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
- …
