1,720,955 research outputs found
Election de leader et détection de fautes pour robots modulaires sécurisés et auto-reconfigurables
No full textLes récents progrès de la science laissent présager que, dans les prochaines décennies, il pourrait être possible d'assembler des unités simples de traitement de l'information pour un coût presque nul. Des myriades de ces petites unités pourraient être combinées pour former des systèmes puissants capables de résoudre des tâches complexes. Cette vision de la construction d'unités de traitement microscopiques bon marché est soutenue par les progrès réalisés dans la fabrication de composants microélectro mécaniques, de sorte que l'on peut envisager d'intégrer des circuits logiques, des microcapteurs, des microactionneurs et des dispositifs de communication sur la même puce. Cette thèse présente quatre algorithmes qui proposent des solutions à quatre des principaux problèmes de la matière programmable : l'élection du leader, la reconfiguration, la détection des erreurs et la sécurité. L'algorithme d'élection du leader élit de manière déterministe un leader dans un système robotique modulaire, indépendamment du type et de la configuration des modules. Le problème de reconfiguration se produit lorsque trop de particules se déplacent en même temps. Cela peut entraîner des collisions entre les modules. Pour résoudre ce problème, un algorithme de reconfiguration basé sur les forces virtuelles est créé. Cet algorithme s'attaque au problème de l'auto-reconfiguration en présentant un algorithme de planification déterministe qui peut décider quelles positions peuvent être remplies sur plusieurs itérations en utilisant des forces virtuelles. Pour détecter les erreurs dans les systèmes de matière programmable, un algorithme de détection d'erreurs appelé DETECTOR est proposé. C'est un algorithme de détection de fautes distribué hiérarchiquement, il permet de détecter les déconnexions de manière hiérarchique. Le leader du système va construire l'arbre de recouvrement, attribuer des coordonnées à chaque module et les comparer pour détecter les déconnexions. Et enfin, pour assurer la sécurité dans la matière programmable, un protocole de sécurité est développé pour résoudre le problème. Ce protocole est basé sur la cryptographie légère et utilise le même protocole de cryptage comme fonction de hachage tout en gardant à l'esprit l'architecture distribuée. Les résultats d'analyse et de simulation montrent l'efficacité de la méthode proposée.Recent advancements in science foreshadow that in the next few decades it might be possible to assemble simple information processing units at almost no cost. Myriads of these small-scale units could be combined to powerful systems capable of solving intricate tasks. This vision of building cheap microscopic processing units is supported by the progress made in manufacturing microelectro mechanical components, such that one can anticipate integrating logic circuits, microsensors, microactuators, and communication devices on the same chip. This thesis presents four algorithms that propose a solution to four of the main issues in programmable matter: Leader election, reconfiguration, error detection, and security. The leader election algorithm deterministically elects a leader in a modular robotic system regardless of the modules' type and configuration. The reconfiguration problem occurs when too many particles are moving at the same time. This might lead to collisions among modules. To solve this problem, a reconfiguration algorithm is created based on virtual forces. This algorithm tackles the self-reconfiguration problem by presenting a deterministic planning algorithm that can decide which positions can be filled over multiple iterations using virtual forces. To detect errors in programmable matter systems, an error detection algorithm called DETECTOR is proposed. It is a hierarchically distributed fault detection algorithm, it allows the detection of disconnections in a hierarchical manner. The leader of the system will construct the spanning tree, assign coordinates to each module and compare them to detect the disconnections. And finally, to ensure security in programmable matter, a security protocol is developed to solve the issue. This protocol is based on lightweight cryptography and uses the same encryption protocol as a hashing function while keeping the distributed architecture in mind. The analysis and simulation results show the efficiency of the proposed method
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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