1,720,961 research outputs found
Planification stratégique de trajectoires d'avion 4D sous uncertitudes
No full textTo sustain the continuously increasing air traffic demand, the future air traffic management system will rely on a so-called Trajectory Based Operations (TBO) concept that will increase air traffic capacity by reducing the controllers workload. This will be achieved by transferring tactical conflict detection and resolution tasks to the pre-tactical planning phase. In this future air traffic management paradigm context, this theis presents a methodology to address such pre-tactical trajectory planning at nation-wide and continent scale. The proposed methodology aims at minimizing the global interaction between aircraft trajectories by allocating alternative departure times, alternative horizontal flight paths, and alternative flight levels to the trajectories involved in the interaction. To improve robustness of the pre-tactical trajectory planning, uncertainty of aircraft position and aircraft arrival time to any given position on the trajectory are considered. In addition, the thesis addresses also the problem of planning of military mission in the civilian traffic in order to reduce the associated inpact.Pour soutenir la demande de trafic aérien en constante augmentation, le futur système de gestion du trafic aérien s'appuiera sur un concept basé sur les trajectoire (TBO) qui augmentera la capacité du trafic aérien en réduisant la charge de travail des contrôleurs. Cet objectif sera atteint en transférant les tâches tactiques de détection et de résolution des conflits à la phase de planification pré-tactique. Dans ce futur contexte de gestion du trafic aérien, cette thèse présente une méthodologie permettant de planifier le traffic pré-tactique à l'échelle nationale et continentale. La méthodologie proposée vise à minimiser l'interaction globale entre les trajectoires des aéronefs en allouant des heures de départ alternatives, des profiles de vol horizontales et des niveaux de vol alternatifs aux avions impliquées dans l'interaction. Pour améliorer la robustesse de la planification de trajectoire pré-tactique, l'incertitude de la position et de l'heure d'arrivée de l'aéronef à une position donnée sur la trajectoire est prise en compte. En outre, la thèse aborde également le problème de la planification de la mission militaire dans le trafic civil afin de réduire l'impact associé
Planification stratégique de trajectoires d'avion 4D sous uncertitudes
No full textTo sustain the continuously increasing air traffic demand, the future air traffic management system will rely on a so-called Trajectory Based Operations (TBO) concept that will increase air traffic capacity by reducing the controllers workload. This will be achieved by transferring tactical conflict detection and resolution tasks to the pre-tactical planning phase. In this future air traffic management paradigm context, this theis presents a methodology to address such pre-tactical trajectory planning at nation-wide and continent scale. The proposed methodology aims at minimizing the global interaction between aircraft trajectories by allocating alternative departure times, alternative horizontal flight paths, and alternative flight levels to the trajectories involved in the interaction. To improve robustness of the pre-tactical trajectory planning, uncertainty of aircraft position and aircraft arrival time to any given position on the trajectory are considered. In addition, the thesis addresses also the problem of planning of military mission in the civilian traffic in order to reduce the associated inpact.Pour soutenir la demande de trafic aérien en constante augmentation, le futur système de gestion du trafic aérien s'appuiera sur un concept basé sur les trajectoire (TBO) qui augmentera la capacité du trafic aérien en réduisant la charge de travail des contrôleurs. Cet objectif sera atteint en transférant les tâches tactiques de détection et de résolution des conflits à la phase de planification pré-tactique. Dans ce futur contexte de gestion du trafic aérien, cette thèse présente une méthodologie permettant de planifier le traffic pré-tactique à l'échelle nationale et continentale. La méthodologie proposée vise à minimiser l'interaction globale entre les trajectoires des aéronefs en allouant des heures de départ alternatives, des profiles de vol horizontales et des niveaux de vol alternatifs aux avions impliquées dans l'interaction. Pour améliorer la robustesse de la planification de trajectoire pré-tactique, l'incertitude de la position et de l'heure d'arrivée de l'aéronef à une position donnée sur la trajectoire est prise en compte. En outre, la thèse aborde également le problème de la planification de la mission militaire dans le trafic civil afin de réduire l'impact associé
4D Trajectories Strategic Planning under Uncertainties
No full textPour soutenir la demande de trafic aérien en constante augmentation, le futur système de gestion du trafic aérien s'appuiera sur un concept basé sur les trajectoire (TBO) qui augmentera la capacité du trafic aérien en réduisant la charge de travail des contrôleurs. Cet objectif sera atteint en transférant les tâches tactiques de détection et de résolution des conflits à la phase de planification pré-tactique. Dans ce futur contexte de gestion du trafic aérien, cette thèse présente une méthodologie permettant de planifier le traffic pré-tactique à l'échelle nationale et continentale. La méthodologie proposée vise à minimiser l'interaction globale entre les trajectoires des aéronefs en allouant des heures de départ alternatives, des profiles de vol horizontales et des niveaux de vol alternatifs aux avions impliquées dans l'interaction. Pour améliorer la robustesse de la planification de trajectoire pré-tactique, l'incertitude de la position et de l'heure d'arrivée de l'aéronef à une position donnée sur la trajectoire est prise en compte. En outre, la thèse aborde également le problème de la planification de la mission militaire dans le trafic civil afin de réduire l'impact associé.To sustain the continuously increasing air traffic demand, the future air traffic management system will rely on a so-called Trajectory Based Operations (TBO) concept that will increase air traffic capacity by reducing the controllers workload. This will be achieved by transferring tactical conflict detection and resolution tasks to the pre-tactical planning phase. In this future air traffic management paradigm context, this theis presents a methodology to address such pre-tactical trajectory planning at nation-wide and continent scale. The proposed methodology aims at minimizing the global interaction between aircraft trajectories by allocating alternative departure times, alternative horizontal flight paths, and alternative flight levels to the trajectories involved in the interaction. To improve robustness of the pre-tactical trajectory planning, uncertainty of aircraft position and aircraft arrival time to any given position on the trajectory are considered. In addition, the thesis addresses also the problem of planning of military mission in the civilian traffic in order to reduce the associated inpact
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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