1,720,953 research outputs found
Monotonicity of value function and optimal policy in cross-layer design of communication systems
No full textMarkov decision theory has been widely used to model engineering setups as sequential optimization problems. Using Markov decision models and underling techniques in this theory let the engineers improve the performance of the system. Dynamic programming and approximate dynamic programming are the main tools to find optimal policies; however, just finding the optimal policy numerically does not add anything to our engineering intuition about the physical system. In order to grasp a deeper understanding of the underlying physical process, designer is interested in investigating qualitative properties of the optimal value function and optimal policy. These qualitative results not only help researchers to understand the behavior of the physical system better, but also let designers simplify their implementation. Knowing the structure of optimal policy can reduce the implementation of an optimal policy from a look up table to a sparse matrix or just set of thresholds.Markov decision theory has been widely used in queuing problems related to communication systems. In these problems a transmitter is dealing with transmitting a stream of data packets queued in a buffer, over a physical channel. Transmitter should not only deal with stochasticity in the arriving data but also it should manage the physical layer constraints.These type of problems usually are categorized as queuing problems, and in the literature, the solution to these problems are investigated with tools in both queuing theory and Markov decision theory. In this thesis, our emphasis is on investigating monotonicity property of the optimal strategy in such models. We start with brief introduction to Markov decision processes and common techniques and tools in Markov decision theory to prove monotonicity. We then investigate a classic result in this area. We present simpler proofs for the existing results and try to generalize the idea in two directions. First, we try to establish monotonicity property when transmitter has access to an ACK/NACK feedback channel. In the second approach, we try to show these properties in an energy harvesting scenario.La théorie de la décision de Markov a été largement utilisée pour modéliser les configurations d’ingénierie sous forme séquentielle problème d’optimisation.L’utilisation de modèles de décision de Markov et de techniques sous-jacentes de cette théorie a permis aux ingénieurs d’améliorer les performances du système. Une programmation dynamique approximative est le principal outil pour trouver des politiques optimales.Cependant le fait de trouver numériquement la politique optimale n’ajoute rien à notre ingénierie Intuition sur le système physique; Afin de mieux comprendre le déséquilibre du processus physique dérivé on pourrait être intéressé à étudier les propriétés qualitatives de la fonction valeur optimale et de la politique optimale. Ces résultats qualitatifs aident non seulement les chercheurs à mieux comprendre le comportement du système physique, mais également à permettre aux concepteurs de simplifier leur mise en oeuvre. Connaître la structure d’une politique optimale peut réduire celle d’une table de consultation à une matrice clairsemée ou à un ensemble de seuils. La théorie de la décision de Markov a été largement utilisée dans les problèmes de file d’attente liés à des systèmes de communication. Ces problèmes concernent un émetteur en train de transmettre un flux de paquets de données en file d’attente dans une mémoire tampon sur un canal physique. L’émetteur ne devrait pas traiter uniquement avec la stochasticité dans les données à venir mais il devrait aussi gérer la physique des contraintes desouche.Ce type de problème est généralement classé en tant que problème de file d’attente et, dans la littérature technique, la solution est étudiée à l’aide d’outils de la théorie de la file d’attente et de la théorie de la décision de Markov. Dans ma thèse l’accent est mis sur l’investigation de la monotonie. Propriété de la stratégie optimale dans de tels modèles. Nous commençons par une brève introduction à Markov concernant le processus de décision et les techniques et outils communs dans sa théorie pour prouver la monotonicité. Nous étudions ensuite un résultat classique dans ce domaine. Nous présentons des preuves plus simples pour les résultats existants et essayons de généraliser l’idée dans deux directions. Tout d’abord nous essayons d’établir la propriété de monotonicité lorsque l’émetteur a accès à un retour ACK / NACK canal. Dans la seconde approche nous essayuns de montrer ces propriétés dans un système de récupération d’énergie.Scénari
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
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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