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57,325
Preliminary Subsonic Aerodynamic Model for . . .
, 1992
"... (Maximum 200 words) A nonlinear, sixdegreeoffreedom aerodynamic model for an early version of the HL20 lifting body is described and compared with wind tunnel data upon which it is based. Polynomial functions describing most of the aerodynamic parameters are given and tables of these functions ..."
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(Maximum 200 words) A nonlinear, sixdegreeoffreedom aerodynamic model for an early version of the HL20 lifting body is described and compared with wind tunnel data upon which it is based. Polynomial functions describing most of the aerodynamic parameters are given and tables of these functions
Refinements to the Aerodynamic Model of an Ascending Balloon
"... Trajectory simulations for high altitude scientific balloons have typically focused on the thermal balance of the system. The calculated upward force, or free lift, on the balloon was based on the density of the lifting gas and the density of the surrounding air. Aerodynamic models for calculating t ..."
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Trajectory simulations for high altitude scientific balloons have typically focused on the thermal balance of the system. The calculated upward force, or free lift, on the balloon was based on the density of the lifting gas and the density of the surrounding air. Aerodynamic models for calculating
FAST AERODYNAMIC MODEL FOR DESIGN TECHNOLOGY
"... reduction techniques, CFD methods, aerodynamic database. Abstract. An innovative ITbased technique of Fast Aerodynamic Computations is offered for the analysis of airliner aerodynamic characteristics in cruise flight, which is crucial from the effectiveness standpoint. A typical airliner configurat ..."
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database was formed by a CFDcode BLWF58, enabling analysis of transonic airflow about the aircraft with regard to viscosity effects. Integration of the above components helped produce the Fast Aerodynamic Model, which serves to determine various aerodynamic characteristics. The proposed technology
Low Order Aerodynamic Models for Aeroelastic Control of Turbomachines
, 1999
"... A reduced order aerodynamic model is developed for aeroelastic analysis of turbomachines. The proper orthogonal decompostion technique is used to obtain the modal basis vectors of this model. Twodimensional frequency domain solutions are used to obtain the basis vectors efficiently, however the mod ..."
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Cited by 16 (6 self)
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A reduced order aerodynamic model is developed for aeroelastic analysis of turbomachines. The proper orthogonal decompostion technique is used to obtain the modal basis vectors of this model. Twodimensional frequency domain solutions are used to obtain the basis vectors efficiently, however
Longitudinal Aerodynamic Modeling Based on Support Vector Machine
"... Abstract. In order to accurately depict the longitudinal aerodynamic characteristics of flight vehicle, a new aerodynamic modeling method based on Support Vector Machine (SVM) is proposed. SVM is a machine learning method that solves the problem by mean of optimization method on the basis of statist ..."
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Abstract. In order to accurately depict the longitudinal aerodynamic characteristics of flight vehicle, a new aerodynamic modeling method based on Support Vector Machine (SVM) is proposed. SVM is a machine learning method that solves the problem by mean of optimization method on the basis
A DiscreteTime Aerodynamic Model of the Vocal Tract
"... Computer simulations of speech processes can lead to better understanding of realworld speech phenomena and can be used to predict and interpret the results of speech production experiments. An aerodynamic model that updates vocal tract parameters over small time steps is presented. Some initial re ..."
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Computer simulations of speech processes can lead to better understanding of realworld speech phenomena and can be used to predict and interpret the results of speech production experiments. An aerodynamic model that updates vocal tract parameters over small time steps is presented. Some initial
A New Extension of the Kalman Filter to Nonlinear Systems
, 1997
"... The Kalman filter(KF) is one of the most widely used methods for tracking and estimation due to its simplicity, optimality, tractability and robustness. However, the application of the KF to nonlinear systems can be difficult. The most common approach is to use the Extended Kalman Filter (EKF) which ..."
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Cited by 747 (6 self)
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) which simply linearises all nonlinear models so that the traditional linear Kalman filter can be applied. Although the EKF (in its many forms) is a widely used filtering strategy, over thirty years of experience with it has led to a general consensus within the tracking and control community
The Skill Content of Recent Technological Change: An Empirical Exploration
, 2000
"... Recent empirical and case study evidence documents a strong association between the adoption of computers and increased use of college educated or nonproduction workers. With few exceptions, the conceptual link explaining how computer technology complements skilled labor or substitutes for unskille ..."
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Cited by 607 (29 self)
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for unskilled labor is less well developed. This paper applies an understanding of what computers do – the execution of procedural or rulesbased logic – to develop and test a simple model of how the widespread adoption of computers in the workplace might alter workplace skill demands. Two essential contentions
The interdisciplinary study of coordination
 ACM Computing Surveys
, 1994
"... This survey characterizes an emerging research area, sometimes called coordination theory, that focuses on the interdisciplinary study of coordination. Research in this area uses and extends ideas about coordination from disciplines such as computer science, organization theory, operations research, ..."
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Cited by 773 (21 self)
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This survey characterizes an emerging research area, sometimes called coordination theory, that focuses on the interdisciplinary study of coordination. Research in this area uses and extends ideas about coordination from disciplines such as computer science, organization theory, operations research, economics, linguistics, and psychology. A key insight of the framework presented here is that coordination can be seen as the process of managing dependencies among activities. Further progress, therefore, should be possible by characterizing different kinds of dependencies and identifying the coordination processes that can be used to manage them. A variety of processes are analyzed from this perspective, and commonalities across disciplines are identified. Processes analyzed include those for managing shared resources, producer/consumer relationships, simultaneity constraints, and tank/subtask dependencies. Section 3 summarizes ways of applying a coordination perspective in three different domains: (1) understanding the effects of information technology on human organizations and markets, (2) designing cooperative work tools, and (3) designing distributed and parallel computer systems. In the final section, elements of a research
FAST VOLUME RENDERING USING A SHEARWARP FACTORIZATION OF THE VIEWING TRANSFORMATION
, 1995
"... Volume rendering is a technique for visualizing 3D arrays of sampled data. It has applications in areas such as medical imaging and scientific visualization, but its use has been limited by its high computational expense. Early implementations of volume rendering used bruteforce techniques that req ..."
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Cited by 541 (2 self)
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Volume rendering is a technique for visualizing 3D arrays of sampled data. It has applications in areas such as medical imaging and scientific visualization, but its use has been limited by its high computational expense. Early implementations of volume rendering used bruteforce techniques that require on the order of 100 seconds to render typical data sets on a workstation. Algorithms with optimizations that exploit coherence in the data have reduced rendering times to the range of ten seconds but are still not fast enough for interactive visualization applications. In this thesis we present a family of volume rendering algorithms that reduces rendering times to one second. First we present a scanlineorder volume rendering algorithm that exploits coherence in both the volume data and the image. We show that scanlineorder algorithms are fundamentally more efficient than commonlyused ray casting algorithms because the latter must perform analytic geometry calculations (e.g. intersecting rays with axisaligned boxes). The new scanlineorder algorithm simply streams through the volume and the image in storage order. We describe variants of the algorithm for both parallel and perspective projections and
Results 1  10
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57,325