4,464 research outputs found

    Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance

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    Repetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and 2\ell_{2}–\ell_{\infty} dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by HH_{\infty} and 2\ell_{2}\ell_{\infty} norms

    Teaching Digital Methods:Interview with Richard Rogers

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    Richard Rogers is the Director of the Digital Methods Initiative, one of Europe’s leading Internet studies research groups. He is Professor of New Media and Digital Culture in the Department of Media Studies at the University of Amsterdam and Academic Director of the Netherlands Research School for Media Studies. Rogers is author of Information Politics on the Web(MIT Press, 2004), Digital Methods (MITPress, 2013) and Doing Digital Methods (Sage, 2019). In this interview, originally conducted for The Pedagogy of Methodological Learning study (Nind & Lewthwaite, 2018) and updated for its publication in Diseña, Rogers speaks about the teaching philosophy behind digital methods, including a particular approach to learning about information design for the humanities and social sciences. He also discusses how he repurposes certain formats traditionally associated with computer science (hackathons) for digital meth-ods ‘data sprints’

    Interview with Morgan Callen Rogers, Bath native and author of the novel Red Rub

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    Interview with Morgan Callen Rogers, Bath native and author of the novel Red Ruby Heart in a Cold Blue Sea

    Convergent learning algorithms for unknown reward games

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    In this paper, we address the problem of convergence to Nash equilibria in games with rewards that are initially unknown and must be estimated over time from noisy observations. These games arise in many real-world applications, whenever rewards for actions cannot be prespecified and must be learned online, but standard results in game theory do not consider such settings. For this problem, we derive a multiagent version of Q-learning to estimate the reward functions using novel forms of the e-greedy learning policy. Using these Q-learning schemes to estimate reward functions, we then provide conditions guaranteeing the convergence of adaptive play and the better-reply processes to Nash equilibria in potential games and games with more general forms of acyclicity, and of regret matching to the set of correlated equilibria in generic games. A secondary result is that we prove the strong ergodicity of stochastic adaptive play and stochastic better-reply processes in the case of vanishing perturbations. Finally, we illustrate the efficacy of the algorithms in a set of randomly generated three-player coordination games and show the practical necessity of our results by demonstrating that violations to the derived learning parameter conditions can cause the algorithms to fail to converge

    Rogers to The Denver Post, 28 September 1962

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    Rogers relates interviews with gathered university students regarding their opinions on desegregation.https://egrove.olemiss.edu/west_union_med/1050/thumbnail.jp
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