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  • Other Sources  (1,831)
  • CYBERNETICS  (1,831)
  • 1990-1994  (1,831)
  • 1
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    Fuel-optimal slewing of an experimental hinged-free beam (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: With the recent development of numerical methods for exactly solving larger order fuel-optlmal control problems, the implementation of exact real-time fuel-optimal control becomes possible. This paper describes a physical experiment in which a hinged-free beam is slewed in a fuel-optimal manner. A comparison between experimental results and the analytical predictions highlights the sources of errors typical of this class of problems.
    Keywords: CYBERNETICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 16; 6; p. 1162-1168.
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  • 2
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    Terrestrial applications of NASA space telerobotics technologies (1994)
    In:  CASI
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    Publication Date: 2019-08-28
    Description: In 1985 the National Aeronautics and Space Administration (NASA) instituted a research program in telerobotics to develop and provide the technology for applications of telerobotics to the United States space program. The activities of the program are intended to most effectively utilize limited astronaut time by facilitating tasks such as inspection, assembly, repair, and servicing, as well as providing extended capability for remotely conducting planetary surface operations. As the program matured, it also developed a strong heritage of working with government and industry to directly transfer the developed technology into industrial applications.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 94-1235-CP , NASA. Johnson Space Center, Conference on Intelligent Robotics in Field, Factory, Service, and Space (CIRFFSS 1994), Volume 1; p 434-440
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  • 3
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    Decision boundary feature selection for non-parametric classifier (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Feature selection has been one of the most important topics in pattern recognition. Although many authors have studied feature selection for parametric classifiers, few algorithms are available for feature selection for nonparametric classifiers. In this paper we propose a new feature selection algorithm based on decision boundaries for nonparametric classifiers. We first note that feature selection for pattern recognition is equivalent to retaining 'discriminantly informative features', and a discriminantly informative feature is related to the decision boundary. A procedure to extract discriminantly informative features based on a decision boundary for nonparametric classification is proposed. Experiments show that the proposed algorithm finds effective features for the nonparametric classifier with Parzen density estimation.
    Keywords: CYBERNETICS
    Type: Society for Imaging Science and Technology, Annual Conference; May 12, 1991 - May 17, 1991; Saint Paul, MN; United States|; 4 p.
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  • 4
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    Practical model reduction for flexible structures (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Keywords: CYBERNETICS
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 41; 2; p. 227-247.
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  • 5
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    Thermal and range fusion for a planetary rover (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: This paper describes how fusion between thermal and range imaging allows us to discriminate different types of materials in outdoor scenes. First, we analyze how pure vision segmentation algorithms applied to thermal images allow discriminating materials such as rock and sand. Second, we show how combining thermal and range information allows us to better discriminate rocks from sand. Third, as an application, we examine how an autonomous legged robot can use these techniques to explore other planets.
    Keywords: CYBERNETICS
    Type: In: Mobile robots VI; Proceedings of the Meeting, Boston, MA, Nov. 14, 15, 1991 (A93-53170 23-63); p. 359-368.
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  • 6
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    Robustness analysis applied to substructure controller synthesis (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The stability and robustness of the controlled system obtained via the substructure control synthesis (SCS) method of Su et al. (1990) were examined using a six-bay truss model, and employing an LQG control design method to obtain controllers for two separate structures. It is found that the assembled controller provides a stability in this instance. A qualitative assessment of the stability robustness of the system with controller designed with the SCS method is provided by obtaining a controller using the complete truss model and comparing the robustness of the corresponding closed-loop systems.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 93-3773 , In: AIAA Guidance, Navigation and Control Conference, Monterey, CA, Aug. 9-11, 1993, Technical Papers. Pt. 2 (A93-51301 22-63); p. 685-689.
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  • 7
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    Dissipative control of energy flow in interconnected systems (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Dissipative energy flow controllers are designed for interconnected modal subsystems. Active feedback controllers for vibration suppression are then viewed as either an additional subsystem or a dissipative coupling. These controllers, which are designed by the LQG positive real control approach, maximize energy flow from a specified modal subsystem.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 93-3770 , In: AIAA Guidance, Navigation and Control Conference, Monterey, CA, Aug. 9-11, 1993, Technical Papers. Pt. 2 (A93-51301 22-63); p. 657-666.
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  • 8
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    Neural network applications (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: A design procedure is suggested for neural networks which accommodates the inclusion of such knowledge-based systems techniques as fuzzy logic and pairwise comparisons. The use of these procedures in the design of applications combines qualitative and quantitative factors with empirical data to yield a model with justifiable design and parameter selection procedures. The procedure is especially relevant to areas of back-propagation neural network design which are highly responsive to the use of precisely recorded expert knowledge.
    Keywords: CYBERNETICS
    Type: In: WNN 92; Proceedings of the 3rd Workshop on Neural Networks: Academic(Industrial)NASA/Defense, Auburn Univ., AL, Feb. 10-12, 1992 and South Shore Harbour, TX, Nov. 4-6, 1992 (A93-50726 21-63); p. 5-9.
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  • 9
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    WNN 92; Proceedings of the 3rd Workshop on Neural Networks: Academic/Industrial/NASA/Defense, Auburn Univ., AL, Feb. 10-12, 1992 and South Shore Harbour, TX, Nov. 4-6, 1992 (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The present conference discusses such neural networks (NN) related topics as their current development status, NN architectures, NN learning rules, NN optimization methods, NN temporal models, NN control methods, NN pattern recognition systems and applications, biological and biomedical applications of NNs, VLSI design techniques for NNs, NN systems simulation, fuzzy logic, and genetic algorithms. Attention is given to missileborne integrated NNs, adaptive-mixture NNs, implementable learning rules, an NN simulator for travelling salesman problem solutions, similarity-based forecasting, NN control of hypersonic aircraft takeoff, NN control of the Space Shuttle Arm, an adaptive NN robot manipulator controller, a synthetic approach to digital filtering, NNs for speech analysis, adaptive spline networks, an anticipatory fuzzy logic controller, and encoding operations for fuzzy associative memories.
    Keywords: CYBERNETICS
    Type: SPIE-1721 , ; 679 p.
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  • 10
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    A possibilistic approach to clustering (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Fuzzy clustering has been shown to be advantageous over crisp (or traditional) clustering methods in that total commitment of a vector to a given class is not required at each image pattern recognition iteration. Recently fuzzy clustering methods have shown spectacular ability to detect not only hypervolume clusters, but also clusters which are actually 'thin shells', i.e., curves and surfaces. Most analytic fuzzy clustering approaches are derived from the 'Fuzzy C-Means' (FCM) algorithm. The FCM uses the probabilistic constraint that the memberships of a data point across classes sum to one. This constraint was used to generate the membership update equations for an iterative algorithm. Recently, we cast the clustering problem into the framework of possibility theory using an approach in which the resulting partition of the data can be interpreted as a possibilistic partition, and the membership values may be interpreted as degrees of possibility of the points belonging to the classes. We show the ability of this approach to detect linear and quartic curves in the presence of considerable noise.
    Keywords: CYBERNETICS
    Type: IEEE Transactions on Fuzzy Systems (ISSN 1063-6706); 1; 2; p. 98-110.
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