4,496 research outputs found

    Some programming techniques for increasing program versatility and efficiency on CDC equipment

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    Five programming techniques used to decrease core and increase program versatility and efficiency are explained. The techniques are: (1) dynamic storage allocation, (2) automatic core-sizing and core-resizing, (3) matrix partitioning, (4) free field alphanumeric reads, and (5) incorporation of a data complex. The advantages of these techniques and the basic methods for employing them are explained and illustrated. Several actual program applications which utilize these techniques are described as examples

    Design of a candidate flutter suppression control law for DAST ARW-2

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    A control law is developed to suppress symmetric flutter for a mathematical model of an aeroelastic research vehicle. An implementable control law is attained by including modified LQC (Linear Quadratic Gaussian) design techniques, controller order reduction, and gain scheduling. An alternate (complementary) design approach is illustrated for one flight condition wherein nongradient-based constrained optimization techniques are applied to maximize controller robustness

    Fitting aerodynamic forces in the Laplace domain: An application of a nonlinear nongradient technique to multilevel constrained optimization

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    A technique which employs both linear and nonlinear methods in a multilevel optimization structure to best approximate generalized unsteady aerodynamic forces for arbitrary motion is described. Optimum selection of free parameters is made in a rational function approximation of the aerodynamic forces in the Laplace domain such that a best fit is obtained, in a least squares sense, to tabular data for purely oscillatory motion. The multilevel structure and the corresponding formulation of the objective models are presented which separate the reduction of the fit error into linear and nonlinear problems, thus enabling the use of linear methods where practical. Certain equality and inequality constraints that may be imposed are identified; a brief description of the nongradient, nonlinear optimizer which is used is given; and results which illustrate application of the method are presented

    Control law design to meet constraints using SYNPAC-synthesis package for active controls

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    Major features of SYNPAC (Synthesis Package for Active Controls) are described. SYNPAC employs constrained optimization techniques which allow explicit inclusion of design criteria (constraints) in the control law design process. Interrelationships are indicated between this constrained optimization approach, classical and linear quadratic Gaussian design techniques. Results are presented that were obtained by applying SYNPAC to the design of a combined stability augmentation/gust load alleviation control law for the DAST ARW-2

    Application of optimization techniques to the design of a flutter suppression control law for the DAST ARW-2

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    The design of a candidate flutter suppression (FS) control law for the symmetric degrees of freedom for the DAST ARW-2 aircraft is discussed. The results illustrate the application of several currently employed control law design techniques. Subsequent designs, obtained as the mathematical model of the ARW-2 is updated, are expected to employ similar methods and to provide a control law whose performance will be flight tested. This study represents one of the steps necessary to provide an assessment of the validity of applying current control law synthesis and analysis techniques in the design of actively controlled aircraft. Mathematical models employed in the control law design and evaluation phases are described. The control problem is specified by presenting the flutter boundary predicted for the uncontrolled aircraft and by defining objectives and constraints that the controller should satisfy. A full-order controller is obtained by using Linear Quadratic Gaussian (LQG) techniques. The process of obtaining an implementable reduced-order controller is described. One example is also shown in which constrained optimization techniques are utilized to explicitly include robustness criteria within the design algorithm

    Tools for active control system design

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    Efficient control law analysis and design tools which properly account for the interaction of flexible structures, unsteady aerodynamics and active controls are developed. Development, application, validation and documentation of efficient multidisciplinary computer programs for analysis and design of active control laws are also discussed

    Folked, Funked, Punked: How Feminist Performance Poetry Creates Havens for Activism and Change

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    Indiana University-Purdue University Indianapolis (IUPUI)My thesis examines the ways in which female performance poets deliver their messages and how those messages inspire, affirm, and encourage their audiences. From the traditions of outsider art—Beat poetry, feminist poetry, jazz, folk, punk, and rap—feminist performance poets choose the public sphere as a platform to witness to social injustices. In naming inequality, these poets challenge patriarchal foundations of gender roles, question academia’s criteria as to what constitutes “good” poetry, and expose social injustices. In this thesis, I examine the work of feminist performance poets Ani Difranco, Alix Olson, Andrea Gibson, Ursula Rucker, and Jessica Care Moore as examples of a new way of reading. Their work is significant in that they continue the tradition of feminist poetry by challenging the patriarchal status quo through a re-socializing and accessible style. Their work allows audiences to commune together in shared experience and promotes social change by demystifying cultural norms and gender codes in order to expose the exclusivity in patriarchal ideologies. These poets draw on a woman-centered spirituality, subvert misogynistic feminine archetypes, pay homage to ancestors and foremothers, and address issues of the body—naming oppression yet making room for pleasure

    Family-centered rounds and medical student performance on the NBME pediatrics subject (shelf) examination: a retrospective cohort study

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    Objective To determine the association between family-centered rounds (FCR) and medical student knowledge acquisition as assessed by the National Board of Medical Examiners (NBME) pediatric subject (shelf) exam. Methods A retrospective cohort study was conducted of third-year medical students who graduated from Virginia Commonwealth University School of Medicine between 2009 and 2014. This timeframe represented the transition from ‘traditional’ rounds to FCR on the pediatric inpatient unit. Data collected included demographics, United States Medical Licensing Examination (USMLE) Step 1 and 2 scores, and NBME subject examinations in pediatrics (PSE), medicine (MSE), and surgery (SSE). Results Eight hundred and sixteen participants were included in the analysis. Student performance on the PSE could not be statistically differentiated from performance on the MSE for any year except 2011 (z-score=−0.17, p=0.02). Average scores on PSE for years 2009, 2010, 2013, and 2014 were significantly higher than for SSE, but not significantly different for all other years. The PSE was highly correlated with USMLE Step 1 and Step 2 examinations (correlation range 0.56–0.77) for all years. Conclusions Our results showed no difference in PSE performance during a time in which our institution transitioned to FCR. These findings should be reassuring for students, attending physicians, and medical educators

    Dreaming Despite Despair

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    Laurence Ralph’s (2014) Renegade Dreams presents a glimpse into the lived experience of Chicago’s gang members. The author details that through various forms of injury people living in urban poverty hold dreams that motivate them through survival. This book review aims to provide an overview of Ralph’s work while offering intriguing reflections

    Becoming Ellen Van Oss in Lee Blessing\u27s Two Rooms

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    This thesis documents the process implemented in creating the character of Ellen Van Oss in Lee Blessing’s Two Rooms. It includes research, character analysis, script analysis and an evaluation of my performance. Two Rooms was produced by the UNO Department of Film and Theatre and directed by Erick Wolfe. The play was performed at the Robert E. Nims Theatre in the UNO Performing Arts Center November 7, 12, 13, 21, 2015 at 7:30pm and November 8 and 22, 2015 at 2:30pm
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