121,897 research outputs found
Y a-t-il des classiques belges ?
No full textDirkx Paul, Viala Alain. Y a-t-il des classiques belges ?. In: Littératures classiques, n°19, automne 1993. Qu’est-ce qu’un classique ? pp. 313-327
Johan Heilbron Naissance de la sociologie traduit du néerlandais par Paul Dirkx (1re édition, 1990), Marseille, Agone, collection Bancs d’essai, 2006
No full textPfefferkorn Roland. Johan Heilbron Naissance de la sociologie traduit du néerlandais par Paul Dirkx (1re édition, 1990), Marseille, Agone, collection Bancs d’essai, 2006. In: Revue des sciences sociales, N°36, 2006. Écrire les sciences sociales. p. 184
The Effects of Different Testing Methods on Retention and Comprehension of Expository
No full textDirkx, K. J. H., Kester, L., & Kirschner, P. A. (2011). The Effects of Different Testing Methods on Retention and Comprehension of Expository. In N. Mansour (Ed.), Programme book JURE 2011. Junior Researchers of EARLI (pp. 125). Exeter, UK: University of Exeter.In the present research the effects of different testing methods (i.e., free recall, concept
mapping, and summarizing) versus restudy on retention and comprehension were
investigated.This research was financially supported by the Netherlands Organization of Scientific Research (NWO 451.07.007)
Preliminary Navigation Analysis for the Flyby Tour of ESA’s JUICE mission: An investigation on the trajectory correction maneuvers design
No full textThe JUICE spacecraft is an ESA mission to the Jovian system that will be launched in 2022. It will collect scientific data about Jupiter and its Galilean moons thanks to a flyby tour of Europa, Ganymede, Callisto and a final Ganymede orbiting phase. A high number of flybys will be performed with minimumaltitudes of 200 km. The tracking of the spacecraft during the flybys allows the estimation of the position of the spacecraft and the moons; in particular the knowledge of the moons positions can improve noticeably. However, due to the uncertainties in the positions of the moons and the spacecraft itself, a robust trajectory control is required for precise flyby targeting, to ensure that the nominal mission plan is achieved with the required margins. A preliminary navigation analysis for the mission JUICE has been developed, with the objective of the studying the influence of the spacecraft and moons positions uncertainties on the trajectory correction maneuvers (TCMs). The navigation analysis is composed of an orbit determination covariance analysis and a guidance simulator. The covariance analysis determines the standard deviations of the parameters of interest, (spacecraft and moons initial states) from the observations computed along the trajectory of the spacecraft. Different parameters can be chosen for the covariance analysis in order to represent different mission conditions and tracking data performances. The guidance has the purpose of computing the necessary actions to bring back the spacecraft to the desired path after the nominal one has been perturbed with the spacecraft and moons positions uncertainties; these action are the TCMs, which are represented by a ¢V due to the high thrust engine of JUICE. Three different targeting algorithms have been implemented for the guidance, with different characteristics of accuracy and speed. Two statistical maneuvers per flybys have been implemented, the pre-flyby (targeting) maneuver and the post-flyby (cleanup) maneuver. The navigation analysis is performed using a Monte Carlo method, sampling with a normal distribution the results of the covariance analysis to obtain perturbed trajectories; statistical results are then computed. This is necessary because the results of the OD are to be interpreted in a statistical way; the real perturbed trajectory is always affected by an uncertainty. A sensitivity analysis with respect to the tracking data types has been performed for the covariance analysis. The results show that for JUICE an uncertainty of the level of a few hundred meters can be reached, if range and VLBI data are used. However these results are just indicative since Doppler data have not been included in the simulations. The uncertainty in the positions of the Galilean moons obtained thanks to the flybys depends highly from the tracking strategy used and the data types. With themost realistic configuration (tracking interrupted before the flyby and inclusion of all the past data), the level of uncertainty can arrive to a few tens of meters, with data accuracies of 0.2 m for the range and 0.1 nrad for the VLBI. These results are for the formal errors and it is known that they are usually overly optimistic; the true error will be higher. Moreover, the importance of optical data for a further uncertainty reduction has been proven. The improvement of the Galilean moons uncertainties along the Tour as data are continuously added is also observed. Sensitivity analysis with respect to the maneuver time and the maneuver execution errors have been performed for the Monte Carlo navigation analysis. The maneuver time has the highest influence on the size of a maneuver; each flyby presents a time for which the ¢V required to correct the trajectory is minimum. Very often this time is of 3 days before the flyby (for the targeting maneuver), as found often in literature; however many flybys have this minimum around 2 days before the flyby. The maneuver execution error has a limited impact on the total mission ¢V , but it can decrease the accuracy of the targeting, causing an higher miss distance at flyby. The total ¢V required to performthe flyby Tour varies considerably upon the different parameters chosen; using current level accuracies (1mfor the range and 1 nrad for VLBI) and a maneuver time of 3 days before (and after) the flyby, the result is ¢V Æ 13.5 m/s (around 0.67 m/s per flyby). This value includes the targeting and cleanup maneuvers; it is easily obtainable by the propulsion system of JUICE, concluding that it is possible to correct the trajectory for the uncertainties of JUICE and the moons with a small effort.Aerospace EngineeringSpace EngineeringAstrodynamics & Space Mission
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
The vanishing author in computer-generated works: a critical analysis of recent Australian case law
No full textAbstract
The use of software is ubiquitous in the creation of many copyright works, yet the requirement in copyright law that every work have a human author who engages in independent intellectual effort means that its use may prevent copyright subsistence. Several recent Australian cases have refocused attention on authorship as an essential criterion of copyright subsistence, and these cases suggest that much computer-produced output may be authorless and thus lack copyright protection. This article, the first in a two-part series, analyses how each case deals with the question of authorship of computer-produced works and why the use of software diminishes copyright protection for a significant number of computer-generated works. The article critiques the application of conventional notions of human authorship developed in the pre-computer age to modern productions and suggests alternative approaches to authorship that satisfy both the major objectives of copyright policy and the need to adapt to the computer age. The article argues that, without a broader judicial approach to authorship of computer-generated works, Parliament must remedy the lacuna in protection for these ‘authorless’ works. Possible solutions for reform are suggested. In a forthcoming article, the author comprehensively examines those reform proposals
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Parution - COnTEXTES n° 16, "Crises politiques et champs littéraires"
No full textChères et chers collègues, Nous avons le plaisir de vous annoncer la parution du 16e numéro de la revue COnTEXTES. Intitulé « Crises politiques et champs littéraires » (sous la direction de Bastien Amiel, Mathilde Sempé et Paul Dirkx), il est disponible intégralement en ligne. 16 | 2015 Crises politiques et champs littéraires Bastien Amiel, Mathilde Sempé et Paul Dirkx : Introduction. Crises politiques et champs littéraires : un objet interdisciplinaire Marianne Michaux : Les libéraux belges..
- …
