4,661 research outputs found
Development and validation of a general purpose linearization program for rigid aircraft models
A FORTRAN program that provides the user with a powerful and flexible tool for the linearization of aircraft models is discussed. The program LINEAR numerically determines a linear systems model using nonlinear equations of motion and a user-supplied, nonlinear aerodynamic model. The system model determined by LINEAR consists of matrices for both the state and observation equations. The program has been designed to allow easy selection and definition of the state, control, and observation variables to be used in a particular model. Also, included in the report is a comparison of linear and nonlinear models for a high performance aircraft
A knowledge-based flight status monitor for real-time application in digital avionics systems
The Dryden Flight Research Facility of the National Aeronautics and Space Administration (NASA) Ames Research Center (Ames-Dryden) is the principal NASA facility for the flight testing and evaluation of new and complex avionics systems. To aid in the interpretation of system health and status data, a knowledge-based flight status monitor was designed. The monitor was designed to use fault indicators from the onboard system which are telemetered to the ground and processed by a rule-based model of the aircraft failure management system to give timely advice and recommendations in the mission control room. One of the important constraints on the flight status monitor is the need to operate in real time, and to pursue this aspect, a joint research activity between NASA Ames-Dryden and the Royal Aerospace Establishment (RAE) on real-time knowledge-based systems was established. Under this agreement, the original LISP knowledge base for the flight status monitor was reimplemented using the intelligent knowledge-based system toolkit, MUSE, which was developed under RAE sponsorship. Details of the flight status monitor and the MUSE implementation are presented
Brain Drain: The Mere Presence of Oneās Own Smartphone Reduces Available Cognitive Capacity
Our smartphones enableāand encourageāconstant connection to information, entertainment, and
each other. They put the world at our fingertips, and rarely leave our sides. Although these devices have immense potential
to improve welfare, their persistent presence may come at a cognitive cost. In this research, we test the ābrain
drainā hypothesis that the mere presence of oneās own smartphone may occupy limited-capacity cognitive resources,
thereby leaving fewer resources available for other tasks and undercutting cognitive performance. Results from two
experiments indicate that even when people are successful at maintaining sustained attentionāas when avoiding
the temptation to check their phonesāthe mere presence of these devices reduces available cognitive capacity. Moreover,
these cognitive costs are highest for those highest in smartphone dependence. We conclude by discussing the
practical implications of this smartphone-induced brain drain for consumer decision-making and consumer welfare.Marketin
Derivation and definition of a linear aircraft model
A linear aircraft model for a rigid aircraft of constant mass flying over a flat, nonrotating earth is derived and defined. The derivation makes no assumptions of reference trajectory or vehicle symmetry. The linear system equations are derived and evaluated along a general trajectory and include both aircraft dynamics and observation variables
A Dynamic Model of Sponsored Search Advertising
Sponsored search advertising is ascendant Jupiter Research reports
expenditures rose 28% in 2007 to 22 retail price of the software products advertised on the considered
search engine, this implies a conversion rate (sales per click) of about
1.1%, well within common estimates of 1-2% (gamedaily.com). Hence our
approach appears to yield valid estimates of advertiser click
valuations. Another finding is that customers appear to be segmented by
their clicking frequency, with frequent clickers placing a greater
emphasis on the position of the sponsored advertising link. Estimation
of the policy simulations is in progress
User's manual for interactive LINEAR: A FORTRAN program to derive linear aircraft models
An interactive FORTRAN program that provides the user with a powerful and flexible tool for the linearization of aircraft aerodynamic models is documented in this report. The program LINEAR numerically determines a linear system model using nonlinear equations of motion and a user-supplied linear or nonlinear aerodynamic model. The nonlinear equations of motion used are six-degree-of-freedom equations with stationary atmosphere and flat, nonrotating earth assumptions. The system model determined by LINEAR consists of matrices for both the state and observation equations. The program has been designed to allow easy selection and definition of the state, control, and observation variables to be used in a particular model
Geology of the Peterborough and Concord Quadrangles, New Hampshire
Guidebook for field trips in southwestern New Hampshire, southeastern Vermont, and north-central Massachusetts: New England Intercollegiate Geological Conference, 80th annual meeting, October 14, 15 and 16, 1988, Keene, New Hampshire: Trip C-
Application and flight test of linearizing transformations using measurement feedback to the nonlinear control problem
The design of nonlinear controllers has relied on the use of detailed aerodynamic and engine models that must be associated with the control law in the flight system implementation. Many of these controllers were applied to vehicle flight path control problems and have attempted to combine both inner- and outer-loop control functions in a single controller. An approach to the nonlinear trajectory control problem is presented. This approach uses linearizing transformations with measurement feedback to eliminate the need for detailed aircraft models in outer-loop control applications. By applying this approach and separating the inner-loop and outer-loop functions two things were achieved: (1) the need for incorporating detailed aerodynamic models in the controller is obviated; and (2) the controller is more easily incorporated into existing aircraft flight control systems. An implementation of the controller is discussed, and this controller is tested on a six degree-of-freedom F-15 simulation and in flight on an F-15 aircraft. Simulation data are presented which validates this approach over a large portion of the F-15 flight envelope. Proof of this concept is provided by flight-test data that closely matches simulation results. Flight-test data are also presented
Results of the August 1977 Soviet and American meterological rocketsonde intercomparison held at Wallops Island, Virginia
A coordinated program of rocketsonde investigations along about 60 deg E and 70 deg W between the United States and U.S.S.R. is discussed. The rocketsonde instruments used by the U.S. and U.S.S.R. were compared and the results are presented. The U.S. Super Loki Datasonde and the U.S.S.R. M100B rocketsonde are discussed. Results indicate that the U.S/U.S.S.R. rocketsonde measurement agreement improved since the 1973 intercomparisons. It was learned that the mean of the differences of the temperatures compare to within 6 C at about 60 km and to within 2 C near 50 km. Wind measurements were also found to agree
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