1,720,965 research outputs found
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
Vérification d’une bibliothèque mathématique d’un autopilote avec Frama-C
Get PDFLors du développement de système critiques, comme par exemple un autopilote de drone, il est essentiel de s’assurer que le programme est sûr, en utilisant par exemple des méthodes formelles. Pour faciliter la vérification, on se restreint généralement à une abstraction du système ou un sous-ensemble. Cet article présente la vérification d’une bibliothèque mathématique de l’autopilote Paparazzi, à l’aide de l’outil Frama-C, afin de garantir l’absence d’erreur à l’exécution et certaines propriétés fonctionnelles
Vérification formelle du fonctionnement d’un autopilote: Analyse statique et Génération de code vérifiée
No full textCritical systems are systems whose failure could have catastrophic consequences, such as the destruction of expensive equipment or the death of people. These systems are found in the automotive, medical and drone autopilot systems. It is essential to ensure that these systems do not present a risk of failure. Formal methods are powerful verification techniques for obtaining strong guarantees on such systems, even if it is generally not possible to formally verify the entire system. This thesis deals with the formal verification of certain critical software components of a drone autopilot. It made it possible to review different methods of verification and proof of programs that can be applied to such software and use them on a case study, the Paparazzi autopilot developed at ENAC.Les systèmes critiques sont des systèmes dont la défaillance peut avoir des conséquences catastrophiques, telles la destruction de matériel coûteux ou le décès de personnes. On retrouve ces systèmes aussi bien dans l’automobile, le médical ou bien dans les systèmes de pilotage automatique de drone. Il est essentiel de s’assurer que ces systèmes ne présentent pas de risque de défaillance. Les méthodes formelles sont des techniques de vérification puissantes permettant d’obtenir des garanties fortes sur de tels systèmes, même s’il n’est généralement pas possible de vérifier formellement l’ensemble du système. Cette thèse traite de la vérification formelle de certains composants logiciels critique d’un autopilote de drone. Elle a permis de passer en revue différentes méthodes de vérification et de preuve de programmes qui peuvent être appliquées à de tels logiciels et de les utiliser sur un cas d’étude, l’autopilote Paparazzi développé à l’ENAC
Vérification formelle du fonctionnement d’un autopilote: Analyse statique et Génération de code vérifiée
No full textCritical systems are systems whose failure could have catastrophic consequences, such as the destruction of expensive equipment or the death of people. These systems are found in the automotive, medical and drone autopilot systems. It is essential to ensure that these systems do not present a risk of failure. Formal methods are powerful verification techniques for obtaining strong guarantees on such systems, even if it is generally not possible to formally verify the entire system. This thesis deals with the formal verification of certain critical software components of a drone autopilot. It made it possible to review different methods of verification and proof of programs that can be applied to such software and use them on a case study, the Paparazzi autopilot developed at ENAC.Les systèmes critiques sont des systèmes dont la défaillance peut avoir des conséquences catastrophiques, telles la destruction de matériel coûteux ou le décès de personnes. On retrouve ces systèmes aussi bien dans l’automobile, le médical ou bien dans les systèmes de pilotage automatique de drone. Il est essentiel de s’assurer que ces systèmes ne présentent pas de risque de défaillance. Les méthodes formelles sont des techniques de vérification puissantes permettant d’obtenir des garanties fortes sur de tels systèmes, même s’il n’est généralement pas possible de vérifier formellement l’ensemble du système. Cette thèse traite de la vérification formelle de certains composants logiciels critique d’un autopilote de drone. Elle a permis de passer en revue différentes méthodes de vérification et de preuve de programmes qui peuvent être appliquées à de tels logiciels et de les utiliser sur un cas d’étude, l’autopilote Paparazzi développé à l’ENAC
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
Formal verification of an UAV autopilot : Static analysis and Verified Code Generation
No full textLes systèmes critiques sont des systèmes dont la défaillance peut avoir des conséquences catastrophiques, telles la destruction de matériel coûteux ou le décès de personnes. On retrouve ces systèmes aussi bien dans l’automobile, le médical ou bien dans les systèmes de pilotage automatique de drone. Il est essentiel de s’assurer que ces systèmes ne présentent pas de risque de défaillance. Les méthodes formelles sont des techniques de vérification puissantes permettant d’obtenir des garanties fortes sur de tels systèmes, même s’il n’est généralement pas possible de vérifier formellement l’ensemble du système. Cette thèse traite de la vérification formelle de certains composants logiciels critique d’un autopilote de drone. Elle a permis de passer en revue différentes méthodes de vérification et de preuve de programmes qui peuvent être appliquées à de tels logiciels et de les utiliser sur un cas d’étude, l’autopilote Paparazzi développé à l’ENAC.Critical systems are systems whose failure could have catastrophic consequences, such as the destruction of expensive equipment or the death of people. These systems are found in the automotive, medical and drone autopilot systems. It is essential to ensure that these systems do not present a risk of failure. Formal methods are powerful verification techniques for obtaining strong guarantees on such systems, even if it is generally not possible to formally verify the entire system. This thesis deals with the formal verification of certain critical software components of a drone autopilot. It made it possible to review different methods of verification and proof of programs that can be applied to such software and use them on a case study, the Paparazzi autopilot developed at ENAC
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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