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  • 1
    Electronic Resource
    Electronic Resource
    Estimation for boundary-value descriptor systems (1989)
    Springer
    Circuits, systems and signal processing 8 (1989), S. 25-48 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this paper we consider models for noncausal processes consisting of discrete-time descriptor dynamics and boundary conditions on the values of the process at the two ends of the interval on which the process is defined. We discuss the general solution and well-posedness of systems of this type and then apply the method of complementary processes to obtain a specification of the optimal smoother in terms of a boundary-value descriptor Hamiltonian system. We then study the implementation of the optimal smoother. Motivated by the Hamiltonian diagonalization results for nondescriptor systems, we show how the descriptor Hamiltonian dynamics can be transformed to two lower-order systems by the use of transformation matrices involving the solution of two generalized Riccati equations. We present several examples illustrating our results and the nature of the smoothing solution and also present equations for covariance analysis of boundary-value descriptor processes including the smoothing error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598744
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    Paper (German National Licenses)
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  • 2
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    Reliability and performance evaluation of systems containing embedded rule-based expert systems (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method for evaluating the reliability of real-time systems containing embedded rule-based expert systems is proposed and investigated. It is a three stage technique that addresses the impact of knowledge-base uncertainties on the performance of expert systems. In the first stage, a Markov reliability model of the system is developed which identifies the key performance parameters of the expert system. In the second stage, the evaluation method is used to determine the values of the expert system's key performance parameters. The performance parameters can be evaluated directly by using a probabilistic model of uncertainties in the knowledge-base or by using sensitivity analyses. In the third and final state, the performance parameters of the expert system are combined with performance parameters for other system components and subsystems to evaluate the reliability and performance of the complete system. The evaluation method is demonstrated in the context of a simple expert system used to supervise the performances of an FDI algorithm associated with an aircraft longitudinal flight-control system.
    Keywords: COMPUTER SYSTEMS
    Type: NASA-CR-181769 , NAS 1.26:181769
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An Integrated Safety Analysis Methodology for Emerging Air Transport Technologies (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The continuing growth of air traffic will place demands on NASA's Air Traffic Management (ATM) system that cannot be accommodated without the creation of significant delays and economic impacts. To deal with this situation, work has begun to develop new approaches to providing a safe and economical air transportation infrastructure. Many of these emerging air transport technologies will represent radically new approaches to ATM, both for ground and air operations.
    Keywords: Aeronautics (General)
    Type: NASA/CR-1998-207661 , NAS 1.26:207661 , NS605S1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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