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Set Theoretic Approaches To The Aperiodic Control Of Linear Systems

Author : Florian D. Brunner
ISBN : 9783832546229
Genre : Technology & Engineering
File Size : 33.45 MB
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In this thesis, we employ set-theoretic properties of additively disturbed linear discrete-time systems to develop stabilizing aperiodically updated control laws for plants controlled over communication networks. In particular, we design event-triggered and self-triggered controllers with a priori guarantees on closed-loop characteristics such as stability, asymptotic bound, and average communication rate. Different models for the disturbances are taken into account, namely arbitrary disturbances of which only a bound in the form of a compact set is known and stochastic disturbances with known probability distribution. For setups with hard constraints on the states and inputs, we propose aperiodic schemes based on robust model predictive control methods. Both the full information (state-feedback) case, as well as the limited information (output-feedback) case are investigated. It is demonstrated that the proposed controllers achieve a considerable reduction in the required network usage with only moderate or non-existing deterioration of the closed-loop properties guaranteed by comparable controllers that transmit information at every point in time.
Category: Technology & Engineering

Theories Of Metaphor Revised

Author : Stephan Kessler
ISBN : 9783832533588
Genre : Language Arts & Disciplines
File Size : 59.41 MB
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Interest in literary and linguistic research on metaphor and imagery has increased over the past thirty years. However, theoretical studies dealing with the functioning of metaphor are still rare. Scholars often develop their theoretical approach to metaphor suiting their special goals of analysis only. In addition, a few explanatory models are ubiquitous, such as substitution, analogy-theory, elliptical simile, transferred meaning, the theory of interaction, and conceptualism. In his theoretical sketch Stephan Kessler gives a discursive criticism of the existing models of metaphor and offers a review of conceptualism. What has once been denoted 'rhetorical metaphor' has been changed completely by conceptualism: `Metaphor' itself has become a metaphor. Here, the well-known models of metaphor have led Kessler to dedicate deeper pragma-linguistic thoughts to the functioning of tropes. In Kessler's study, conceptualism is perceived through the eyes of its most prominent supporters, Lakoff and Johnson.
Category: Language Arts & Disciplines

Effects Of Integrated Learning Explicating A Mathematical Concept In Inquiry Based Science Camps

Author : Louise Bindel
ISBN : 9783832546557
Genre : Education
File Size : 50.8 MB
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Although various arguments for integrated learning of mathematics and science exist, empirical evidence that integrated learning is as beneficial as anticipated is limited. Therefore this quasi-experimental study investigates the effect of integrated learning of mathematics and science on eight student variables by comparing it to a control group. Results show that integrated learning is no miracle cure but has positive and negative effects on specific student outcomes. Whereas integrated learning effects students' view of the relation between mathematics and science positively, it effects students' scientific self-concept negatively. Thus, integrated learning should not substitute but rather complement disciplinary learning. Obwohl zahlreiche Argumente für das integrierte Lernen von Mathematik und Naturwissenschaften existieren, ist die vorteilhafte Wirkung integrierten Lernens begrenzt empirisch belegt. Im Rahmen dieser quasi-experimentellen Studie wird der Effekt integrierten Lernens auf acht Schülervariablen durch Vergleiche mit einer Kontrollgruppe untersucht. Die Ergebnisse zeigen, dass integriertes Lernen kein Allheilmittel ist sondern positive und negative Effekte auf bestimmte Schülervariablen hat. Während integriertes Lernen die Sicht der Schülerinnen und Schüler auf die Beziehung zwischen Mathematik und Naturwissenschaften positiv beeinflusst, hat es einen negativen Effekt auf das naturwissenschaftliche Selbstkonzept. Daher sollte integriertes Lernen nicht stellvertretend sondern ergänzend zu disziplinärem Lernen implementiert werden.
Category: Education

Elements Of Transitional Boundary Layer Flowlements

Author : Robert Edward Mayle
ISBN : 9783832545987
Genre : Science
File Size : 71.50 MB
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Second Enhanced Edition Suitable for advanced-level courses or an independent study in fluid mechanics, this text by an expert in the field provides the basic aspects of laminar-to-turbulent flow transition in boundary layers. Logically organized into three major parts, the book covers pre- and post-transitional flow, transitional flow, and several advanced topics in periodically disturbed transitional flow. Some of the subjects covered within the book include high-frequency unsteady laminar flow, turbulent flow, natural transition, bypass transition, turbulent spot theory, turbulent spot kinematics and production, correlations for the onset and rate of transition, global and conditional averaging, transitional flow models, wakeinduced transition, multimode transition, and separated-flow transition. Containing some 202 figures (all drawn by the author), 28 tables, 12 appendices, a supplement on tensors, and an extensive bibliography, the 415 page book provides a wealth of data and information about the subject.
Category: Science

Sensor Data Understanding

Author : Marcin Grzegorzek
ISBN : 9783832546335
Genre : Computers
File Size : 23.80 MB
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The rapid development in the area of sensor technology has been responsible for a number of societal phenomena like UGC (User Generated Content) or QS (Quantified Self). Machine learning algorithms benefit a lot from the availability of such huge volumes of digital data. For example, new technical solutions for challenges caused by the demographic change (ageing society) can be proposed in this way, especially in the context of healthcare systems in industrialised countries. The goal of this book is to present selected algorithms for Visual Scene Analysis (VSA, processing UGC) as well as for Human Data Interpretation (HDI, using data produced within the QS movement) and to expose a joint methodological basis between these two scientific directions. While VSA approaches have reached impressive robustness towards human-like interpretation of visual sensor data, HDI methods are still of limited semantic abstraction power. Using selected state-of-the-art examples, this book shows the maturity of approaches towards closing the semantic gap in both areas, VSA and HDI.
Category: Computers

3d Trajectory Extraction From 2d Videos For Human Activity Analysis

Author : Zeyd Boukhers
ISBN : 9783832545833
Genre : Computers
File Size : 83.54 MB
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The present dissertation addresses the problem of extracting 3D trajectories of objects from 2D videos. The reason of this is the theory that these trajectories symbolise high-level interpretations of human activities. A 3D trajectory of an object means its sequential positions in the real world over time. To this end, a generic framework for detecting objects and extracting their trajectories is proposed. In simpler terms, it means obtaining the 3D coordinate of the objects detected on the image plane and then tracking them in the real world to extract their 3D trajectories. Lastly, this dissertation presents applications of trajectory analysis to understand human activities in crowded environments. In this context, each phase in the framework represents independent approaches dedicated to solving challenging tasks in computer vision and multimedia.
Category: Computers

Stress And Anxiety

Author : Kathleen A. Moore
ISBN : 9783832545079
Genre : Psychology
File Size : 30.66 MB
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We present this collection of peer-reviewed papers covering a contemporary exploration of old and new concepts in the area of stress, anxiety, and coping. The papers include a consideration of the age-old questions concerning maths and test anxiety and the factors which predict or mediate these to a theoretical discussion of what is stress and how do we measure it. Several papers focus on stress and coping in applied settings, such as among patients with chronic disease, panic disorder, and also in those who play sport. Further papers are devoted to stress and coping in educational and academic settings and examine factors which contribute to students' learning as well as those which influence teachers' occupational stress. The recent emphasis by positive psychologists on resilience as well as coping has also featured here with chapters looking at their contributions to psychological health. However, the question is posed as to whether resilience and coping are cut from the same cloth.
Category: Psychology

International Perspectives On University Efficiency

Author : Matthias Klumpp
ISBN : 9783832540104
Genre : Education, Higher
File Size : 75.36 MB
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Resource efficiency and economic considerations are a major topic in higher education systems. Universities are urged to improve their outputs as well as their processes. This book provides a multi-perspective collection of research approaches regarding university efficiency. Though based in Germany and connected to the BMBF research project HELENA at the University of Duisburg-Essen, many contributions provide international comparisons and analysis approaches. Also, most contributions are associated with the annual conferences of EAIR, the European Higher Education Society.
Category: Education, Higher