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15th AIAA Computational Fluid Dynamics Conference 2001

作者： Efraimsson, Gunilla Nordström, Jan Kreiss, Gunilla Aeronautics Division FFA Swedish Defence Research Agency Stockholm Sweden Dept of Numerical Analysis and Computer Science Royal Institute of Technology Stockholm Sweden

First order errors downstream of shocks are detected in computations with second order shock capturing schemes. Based on a matched asymptotic expansion analysis we show how to modify the artificial viscosity and raise the order of accuracy. © 2001 by FOI. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission.

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Integrating task-directed plaiming with reactive object recognition 12

Integrating task-directed plaiming with reactive object reco...

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Intelligent Robots and computer Vision XII: Algorithms and Techniques 1993

作者： Dickinson, Sven Stevenson, Suzanne Amdur, Eugene Tsotsos, John Olsson, Lars Department of Computer Science University of Toronto 6 King's College Rd. TorontoONM5S1A4 Canada Computational Vision and Active Perception Laboratory Dept. of Numerical Analysis and Computing Science Royal Institute of Tecimology StockholmS-10044 Sweden

We describe a robot vision system that achieves complex object recognition with two layers of behaviors, performing the tasks of planning and object recognition, respectively. The recognition layer is a pipeline in which successive stages take in images from a stereo head, recover relevant features, build intermediate representations, and deposit 3-D objects into a world model. Each stage is an independent process that reacts automatically to output from the previous stage. This reactive system operates continuously and autonomously to construct the robot's 3-D model of the environment. Sitting above the recognition pipeline is the planner which is responsible for populating the world model with objects that satisfy the high-level goals of the system. For example, upon examination of the world model, the planner can decide to direct the head to another location, gating new images into the recognition pipeline, causing new objects to be deposited into the world model. Alternatively, the planner can alter the recognition behavior of the pipeline so that objects of a certain type or at a certain location appear in the world model. © 1993 SPIE.

关键词： Pipelines

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Nondifferentiable design optimization problems with application to control engineering

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Optimization 1992年第1期25卷 83-90页

作者： Venkov, G.I. Krushev, N.I. Technical University of Sofia Dept. of Numerical Methods and Analysis Institute of Applied Mathematics and Computer Science Bulgaria

The problems and algorithms in question are applied to the parameter design of automatic control systems. The generality of (1-1) permits the definition of a wide range of constraints in the time and frequency domains, as well as on the eigenvalues and singular values of the system matrices. The designer can set up and satisfy direct requirements to the form of the output reaction, the locus of the return difference, the frequency characteristics, the degree of stability etc. Examples and graphics illustrate the characteristic features of the methods discussed. The algorithms are implemented in a software system for vector optimization developed by the authors. © 1992 Gordon and Breach science Publishers S.A.

关键词： control engineering design optimization Non-differentiable optimization

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Trends in Applied Intelligent Systems 1