1,721,069 research outputs found
La Chine ouverte : aventures d'un Fan-Kouei dans le pays de Tsin
No full textSegundo BNF. CD-ROM (1998) Old Nick e seud. de Paul Émile Daurand ForguesMarca tip. en portFront. xi
Tableau historique de l'industrie et du commerce ...
No full textEn port. de serie, "Encyclopédie portative" precede a "Collection"Marca tip. en por
11. Schwyzer (Ed.). Griechische Grammatik. IIer Band [Syntax], vervollständigt u. herausgegeben von A. Debrunner (Hdb. v. I. v. Müller). München, Beck, 1950
No full textFournier H. 11. Schwyzer (Ed.). Griechische Grammatik. IIer Band [Syntax], vervollständigt u. herausgegeben von A. Debrunner (Hdb. v. I. v. Müller). München, Beck, 1950. In: Revue des Études Grecques, tome 64, fascicule 299-301, Janvier-juin 1951. pp. 350-357
La Commission de Contrôle des Banques
No full textFournier H. La Commission de Contrôle des Banques. In: Revue économique, volume 2, n°5, 1951. pp. 591-599
Neural-network-based optimal attitude control using four impulsive thrusters
Get PDFThis paper tackles the problem of optimal attitude control using a minimal number of attitude thrusters. Three possible control solutions to this problem are presented: 1) a logic-based controller that is simple to implement, 2) a projective control that aims to optimally replicate an ideal continuous control as closely as possible, and 3) an optimal neural predictive control (NPC) that minimizes the total impulse during a maneuver. The NPC is based on a recurrent neural network using a nonlinear autoregressive exogenous configuration for state propagation in a finite-time horizon optimization. Typically, for continuous systems, a back-propagation algorithm for the receding horizon optimization is used, but this is not applicable to systems with discrete inputs. In this paper the NPC is adapted to boolean input systems by employing a robust genetic algorithm to undertake the receding horizon optimization. An automatic selection of the parameters of the cost function is proposed, which improves the performance of the NPC and reduces the tuning to only one parameter. In addition, a multilayer perceptron (MLP) is trained offline with the optimal control data obtained, thus replacing the CPU-intensive cost function with a significantly less computationally expensive metamodel. The NPC performance is compared with the proposed logic-based and projective control algorithms in simulation of a 12U CubeSat and is shown to be the most efficient in terms of total impulse requirement at equal settling time and the least sensitive to the choice of parameters. The MLP control drastically reduces the online computational cost with performance approaching those of the NPC
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
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