1,722,644 research outputs found
Maurice Leenhardt. Le missionnaire
No full textBecker R. Maurice Leenhardt. Le missionnaire. In: Journal de la Société des océanistes, tome 10, 1954. pp. 11-27
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
Counting solutions of a polynomial system locally and exactly
No full textIn this paper, we propose a symbolic-numeric algorithm to count the number of solutions of a zero-dimensional square polynomial system within a local region. We show that the algorithm succeeds under the condition that the region is sufficiently small and well-isolating for a k-fold solution z of the system. In our analysis, we derive a bound on the size of the region that guarantees success. We further argue that this size depends on local parameters such as the norm and multiplicity of z as well as the distances between z and all other solutions. Efficiency of our method stems from the fact that we reduce the problem of counting the roots of the original system to the problem of solving a truncated system of degree k. In particular, if the multiplicity k of z is small compared to the total degrees of the original polynomials, our method considerably improves upon known complete and certified methods. We see a series of applications of our approach. When combined with a numerical solver in the fashion of an a posteriori certification step, we obtain a certified and reliable method for solving polynomial systems while profiting both from the efficiency of the numerical algorithm and the reliability of the symbolic approach. An alternative application results from incorporating our algorithm as inclusion predicate into an elimination method. For the special case of bivariate systems, we experimentally show that this approach leads to a significant improvement over an existing state-of-the-art elimination method
A simple efficient interior point method for min-cost flow
No full textWe present a novel simpler method for the min-cost flow problem and prove that its expected running time is bounded by Õ(m3/2). This matches the best known bounds, which have previously been achieved only by far more complex algorithms or by algorithms for special cases. Our contribution contains three algorithmic parts that are interesting in their own right: (1) We provide a linear time construction of an equivalent auxiliary network and interior primal and dual points, i.e. flows, node potentials and slacks, with potential P0 = Õ(equation found). (2)We present a potential reduction algorithm that transforms initial solutions of potential P0 to ones with duality gap below 1 in Õ (P0 ・ CEF(n, m, ε)) time, where ε −1 = O(m2) and CEF(n, m, ε) denotes the running time of any algorithm that computes an ε-approximate electrical flow. (3) We show that, taking solutions with duality gap less than 1 as input, one can compute optimal integral node potentials in O(m + n log n) time with our novel crossover procedure. Altogether, using a variant of a state-ofthe- art ε-electrical flow solver, we obtain a new simple algorithm for the min-cost flow problem running in Õ (m3/2)
Measuring the Chinese business cycle
No full textThis article documents the business cycle characteristics of the Chinese economy by adopting both nonparametric and parametric methodologies. The two approaches are applied to relevant macroeconomics indicators – Gross Domestic Product (GDP) and Industrial Production (IP) indices – aiming to investigate the growth cycle (deviation cycle). We provide a clear chronology of the Chinese growth cycle. One significant characteristic of the Chinese growth cycle is the relatively direct influence of government policies. However, recently these policy effects have become less significant when compared to global economic influences. Our study provides an enhanced understanding of the properties of business cycle dating algorithms and as such contributes to future Chinese business cycle researc
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
- …
