1,720,954 research outputs found
Stochastic Optimization under Probust and Dynamic Probabilistic Constraints: with Applications to Energy Management
Full text linkDiese Arbeit liefert, in den ersten beiden Kapiteln einen allgemeinen Überblick über die klassischen Ansätze zur Optimierung unter Unsicherheit mit einem Schwerpunkt auf probabilistischen Randbedingung. Anschließend wird im dritten Kapitel eine neue Klasse von sogenannten Probust Randbedingungen beim Auftreten von Modellen mit unsicheren Parametern mit teilweise stochastischem und teilweise nicht-stochastischem Charakter eingeführt. Wir zeigen dabei die Relevanz dieser Aufgabentypen für zwei Problemstellungen in einem stationären Gasnetz auf. Erstens liegen beim Gastransport probabilistische Randbedingungen bezüglich der Gasnachfrage vor sowie auch robuste Randbedin- gungen bezüglich der Rauheitskoeffizienten in den Rohren, welche in der Regel unbekannt sind, da es keine zuverlässigen Messmöglichkeiten gibt. Zweitens lösen wir ein Problem für einen Netzbetreiber, der zum Ziel hat, die angebotene Kapazität für alte und neue Kunden zu maximieren. In diesem Fall ist man mit einer ungewis- sen Gesamtnachfrage konfrontiert, die sich aus der probabilistischen Nachfrage für Altkunden und der robusten Nachfrage für Neukunden zusammensetzt. Für beide Fälle zeigen wir, wie mit probusten Randbedingungen im Rahmen der sogenannten sphärisch-radialen Zerlegung multivariater Gauß-Verteilungen umgegangen werden kann. Starke und schwache Halbstetigkeitsergebnisse werden für den allgemeinen Fall, in Abhängigkeit davon ob Strategien in Lebesgue oder Sobolev Räumen angenommen werden, erstellt. Für ein ein- faches zweistufiges Modell werden überprüfbare Bedingungen für die Lipschitz- Stetigkeit und die Differenzierbarkeit dieser Wahrscheinlichkeitsfunktion abgeleitet und mit expliziten Ableitungsformeln unterstützt. Diese Werkzeuge werden dann verwendet, um das Problem des Bäckers und zwei Probleme des Wasserkraftmanagements zu lösen.This thesis offers, in the first and second chapter, a general overview of the classical approaches to solving optimization under uncertainty, with a focus on probabilistic constraints. Then, in the third chapter, a new class of so-called Probust constraints is introduced in the presence of models with uncertain parameters having partially stochastic and partially non-stochastic character. We show the relevance of this class of approach and solve two problems in a stationary gas network. First, in the context of gas transportation, one ends up with a constraint, which is probabilistic with respect to the load of gas and robust with respect to the roughness coefficients of the pipes (which are uncertain due to a lack of attainable measurements). Secondly, we solve a problem for a network operator, who would like to maximize the offered capacity for old and new customers. In this case, one is faced with an uncertain total demand which is probabilistic for old clients and robust for new clients. In both problems, we demonstrate how probust constraints can be dealt within the framework of the so-called spheric-radial decomposition of multivariate Gaussian distributions. Furthermore, in chapter four, we present novel structural and numerical results for optimization problems under a dynamic joint probabilistic constraint. Strong and weak semicontinuity results are obtained for the general case depending on whether policies are supposed to be in Lebesgue or Sobolev spaces. For a simple two-stage model, verifiable conditions for Lipschitz continuity and differentiability of this probability function are derived and endowed with explicit derivative formulae. These tools are then used to solve the Baker's problem and two hydro-power management problems
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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