2,994 research outputs found
Analysis of gradient projection anti-windup scheme
No full textThe gradient projection anti-windup (GPAW) scheme was recently proposed as an anti-windup method for nonlinear multi-input-multi-output systems/controllers, the solution of which was recognized as a largely open problem in a recent survey paper. This paper analyzes the properties of the GPAW scheme applied to an input constrained first order linear time invariant (LTI) system driven by a first order LTI controller, where the objective is to regulate the system state about the origin. We show that the GPAW compensated system is in fact a projected dynamical system (PDS), and use results in the PDS literature to assert existence and uniqueness of its solutions. The main result is that the GPAW scheme can only maintain/enlarge the exact region of attraction of the uncompensated system.Singapore. DSO National LaboratoriesUnited States. Air Force Office of Scientific Research (grant FA9550-08-1-0086
Geometric properties of gradient projection anti-windup compensated systems
No full textThe gradient projection anti-windup (GPAW) scheme was recently proposed as an anti-windup method for nonlinear multi-input-multi-output systems/controllers, which was recognized as a largely open problem in a recent survey paper. Here, we show that for controllers whose output equation depends only on its state, the GPAW compensated controller achieves exact state-output consistency when appropriately initialized. In a related paper analyzing the GPAW scheme on a simple constrained system, this property was crucial in proving that the GPAW scheme can only maintain/enlarge the exact region of attraction of the uncompensated system. When the nominal controller does not have the required structure, an arbitrarily close approximating controller can be constructed. Further geometric properties of GPAW compensated systems are then presented, which illuminates the role of the GPAW tuning parameter.United States. Air Force Office of Scientific Research (grant FA9550-08-1-0086)Singapore. DSO National Laboratorie
On approximate dynamic inversion and proportional-integral control
No full textApproximate dynamic inversion (ADI) has been established as a method to control minimum-phase, nonaffine-in-control systems. Previous results have shown that for single-input nonaffine-in-control systems, every ADI controller admits a linear proportional-integral (PI) realization that is largely independent of the nonlinear function that defines the system. This paper extends these previous results in three ways. First, we present an extension of ADI that renders the closed loop error dynamics independent of the reference model dynamics. It is then shown that the equivalence between the ADI and PI controllers only holds for the time response when applied to the exact system. Finally, key robustness properties of the two control approaches are compared using linear system techniques. These results indicate that the PI realization is preferable when accurate knowledge of the nonlinear system dynamics is not available, and that the ADI realization would be preferred if time delays are the major limitations in the system
American Gods: fanboys and superheroes in the twentieth century
No full textThis paper details the development of comic book fan culture through the twentieth century. It examines the growing cultural relevance of comic book material and explores the narrative and thematic links between Frank Miller's "The Dark Knight Returns" and 1980s conceptions of masculinity and heroism.M.A.Includes bibliographical referencesby Justin Man
Lizzo “Truth Hurts” Co-Author Allegations
No full textFamous recording artist, Lizzo, filed a preemptive lawsuit on October 23rd, 2019 to disprove allegations that Justin and Jeramiah Raisen and Justin “Yves” Rothman deserve author credit for her song, “Truth Hurts.”Lizzo is seeking a declaratory judgment that the alleged authors have no interest in the copyright or right to share profits. The Raisens and Rothman claim that the lyric “I just took a DNA test, turns out I’m 100% that bitch”, which originated from a popular internet meme, was a part of an unreleased demo, which Lizzo recorded at the Raisen’s studio, and on the final track. Lizzo claims that Rothman believes that she will pay him to stop making accusations against her, simply because he was present at a writing session for the demo track.
This post was originally published on the Cardozo Arts & Entertainment Law Journal website on November 11, 2019. The original post can be accessed via the Archived Link button above
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Lizzo “Truth Hurts” Co-Author Allegations
No full textFamous recording artist, Lizzo, filed a preemptive lawsuit on October 23rd, 2019 to disprove allegations that Justin and Jeramiah Raisen and Justin “Yves” Rothman deserve author credit for her song, “Truth Hurts.”Lizzo is seeking a declaratory judgment that the alleged authors have no interest in the copyright or right to share profits. The Raisens and Rothman claim that the lyric “I just took a DNA test, turns out I’m 100% that bitch”, which originated from a popular internet meme, was a part of an unreleased demo, which Lizzo recorded at the Raisen’s studio, and on the final track. Lizzo claims that Rothman believes that she will pay him to stop making accusations against her, simply because he was present at a writing session for the demo track.
This post was originally published on the Cardozo Arts & Entertainment Law Journal website on November 11, 2019. The original post can be accessed via the Archived Link button above
Meet the Author: New to Cleveland: A Guide to (Re)Discovering the City by Justin Glanville, Illustrated by Julia Kuo
No full textTake a look at Cleveland through fresh eyes. In this exhilarating new book- written, designed and printed right here in Northeast Ohio- Justin Glanville and Julia Kuo tell you everything you need to know about the area in an entertaining, often inspiring way. There is a wealth of information here for newcomers, but the real value lies in what the book can do for longtime residents. Reconnect with your old neighborhood and reach out to new, undreamt of corners of Cleveland. Books will be available for sale and signing at the event
Proportional-integral controllers for minimum-phase nonaffine-in-control systems
No full textWe show that stabilizing tracking proportional-integral (PI)
controllers can be constructed for minimum-phase nonaffine-in-control
systems. The constructed PI controller is an equivalent realization of
an approximate dynamic inversion controller. This equivalence holds
only for the time response when applied to the unperturbed system.
Even when restricted to unperturbed minimum-phase linear time invariant
systems, their closed loop robustness properties differ. This
shows that in general, properties that do not define the equivalence relation
for systems/controllers are not preserved under such equivalence
transformations.Singapore. DSO National LaboratoriesUnited States. Air Force Office of Scientific Research (AFOSR grant FA9550-08-1-0086
AUC Cypher: Justin Terrell Questionnaire
No full textQuestionnaire completed by Justin Terrell AKA Twstid
AUC Cypher: Justin Terrell Transcript
No full textTranscript of AUC Cypher: Justin Terrell AKA Twstid vide
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