1,720,954 research outputs found
Design of minimax controllers for nonlinear systems using cost-to-come methods
No full textThis thesis develops and utilizes the cost-to-come methodology for the construction of minimax controllers for nonlinear systems with partial-state information (PSI), which are subjected to deterministic uncertainty. It introduces the notion of a cost-to-come function and shows how it leads to necessary and sufficient conditions for the existence of a minimax controller. These conditions are the existence of the cost-to-come function and the existence of a solution to an auxiliary full-information (FI) minimax problem. It is also proven that a solution of the FI problem leads directly to a solution of the original PSI problem. The significance of this result is that the auxiliary FI problem can be solved using better-known dynamic programming (DP) techniques."Generally, the auxiliary problem has an infinite-dimensional state, which may make the cost-to-come methodology impractical. Toward resolving this impediment, the thesis first identifies two classes of problems for which cost-to-come methods offer significant insights: one, problems that satisfy a certainty-equivalence principle (which is attributed to the case when a minimax controller can be chosen to be a full-state information (FSI) minimax controller with the state replaced by a ""worst-case"" value of the state), and two, problems for which the cost-to-come function can be characterized by a finite number of parameters (which is attributed to the case where the auxiliary FI problem has a finite-dimensional state). Outside these two classes, bounding techniques can be used to reduce the problem complexity, at the expense of some possible performance degradation. By bounding the FSI cost-to-go function from above, the certainty-equivalence principle can be generalized to gain some insight into the structure of cost-bounding controllers, which may lead to alternative parameter design methods. Bounding the cost-to-come function by finite-dimensional structured cost-to-come functions allows the construction of an auxiliary FI problem, which leads to a cost-bounding controller policy."As an application of the cost-to-come methodology, a class of affine-quadratic (AQ) disturbance attenuation problems is considered in some detail. This class contains H\sp\infty-optimal control and filtering problems, problems of parameter identification and nonlinear adaptive control, and memoryless control problems. For the former subclass, cost-to-come methods provide an alternative derivation of the well-known necessary and sufficient conditions and of a minimax policy. For the latter three subclasses, new algorithms are developed that lead either directly or recursively to optimal solutions. Some numerical examples and simulation studies are provided to illustrate the theoretical results.Made available in DSpace on 2011-05-07T14:21:39Z (GMT). No. of bitstreams: 2
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Design of Minimax Controllers for Nonlinear Systems Using Cost-to-Come Methods
No full textCoordinated Science Laboratory was formerly known as Control Systems LaboratoryJoint Services Electronics Program / N00014-90-J-1270U.S. Department of Energy / DEFG-02-88-ER-13939Ope
Design of Minimax Controllers for Nonlinear Systems Using Cost-to-Come Methods
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Previous issue date: 1994-10Embargo set by: Seth Robbins for item 76944
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Previous issue date: 1994-10Embargo set by: Seth Robbins for item 100814
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Reason: Restricted to UIUC communityOpen Restriction set for Item 100814 on 2019-11-12T19:31:14Z with date null by [email protected] Services Electronics Program / N00014-90-J-1270U.S. Department of Energy / DEFG-02-88-ER-13939OpenCoordinated Science Laboratory was formerly known as Control Systems Laborator
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
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