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  • CYBERNETICS  (7)
  • 2020-2021
  • 1990-1994  (4)
  • 1985-1989  (2)
  • 1980-1984  (1)
  • 1950-1954
  • 1
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    The Generic Spacecraft Analyst Assistant (GenSAA): A tool for automating spacecraft monitoring with expert systems (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Flight Operations Analysts (FOAs) in the Payload Operations Control Center (POCC) are responsible for monitoring a satellite's health and safety. As satellites become more complex and data rates increase, FOAs are quickly approaching a level of information saturation. The FOAs in the spacecraft control center for the COBE (Cosmic Background Explorer) satellite are currently using a fault isolation expert system named the Communications Link Expert Assistance Resource (CLEAR), to assist in isolating and correcting communications link faults. Due to the success of CLEAR and several other systems in the control center domain, many other monitoring and fault isolation expert systems will likely be developed to support control center operations during the early 1990s. To facilitate the development of these systems, a project was initiated to develop a domain specific tool, named the Generic Spacecraft Analyst Assistant (GenSAA). GenSAA will enable spacecraft analysts to easily build simple real-time expert systems that perform spacecraft monitoring and fault isolation functions. Lessons learned during the development of several expert systems at Goddard, thereby establishing the foundation of GenSAA's objectives and offering insights in how problems may be avoided in future project, are described. This is followed by a description of the capabilities, architecture, and usage of GenSAA along with a discussion of its application to future NASA missions.
    Keywords: CYBERNETICS
    Type: The 1991 Goddard Conference on Space Applications of Artificial Intelligence; p 129-139
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Group-oriented coordination models for distributed client-server computing (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper describes group-oriented control models for distributed client-server interactions. These models transparently coordinate requests for services that involve multiple servers, such as queries across distributed databases. Specific capabilities include: decomposing and replicating client requests; dispatching request subtasks or copies to independent, networked servers; and combining server results into a single response for the client. The control models were implemented by combining request broker and process group technologies with an object-oriented communication middleware tool. The models are illustrated in the context of a distributed operations support application for space-based systems.
    Keywords: CYBERNETICS
    Type: NASA. Goddard Space Flight Center, The 1994 Goddard Conference on Space Applications of Artificial Intelligence; p 305-318
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    NASA TECHNICAL REPORTS
  • 3
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    The 1988 Goddard Conference on Space Applications of Artificial Intelligence (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This publication comprises the papers presented at the 1988 Goddard Conference on Space Applications of Artificial Intelligence held at the NASA/Goddard Space Flight Center, Greenbelt, Maryland on May 24, 1988. The purpose of this annual conference is to provide a forum in which current research and development directed at space applications of artificial intelligence can be presented and discussed. The papers in these proceedings fall into the following areas: mission operations support, planning and scheduling; fault isolation/diagnosis; image processing and machine vision; data management; modeling and simulation; and development tools/methodologies.
    Keywords: CYBERNETICS
    Type: NASA-CP-3009 , REPT-88B0212 , NAS 1.55:3009
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Modal cost analysis for linear matrix-second-order systems (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Reduced models and reduced controllers for systems governed by matrix-second-order differential equations are obtained by retaining those modes which make the largest contributions to quadratic control objectives. Such contributions, expressed in terms of modal data, used as mode truncation criteria, allow the statement of the specific control objectives to influence the early model reduction from very high order models which are available, for example, from finite element methods. The relative importance of damping, frequency, and eigenvector in the mode truncation decisions are made explicit for each of these control objectives: attitude control, vibration suppression and figure control. The paper also shows that using modal cost analysis (MCA) on the closed loop modes of the optimally controlled system allows the construction of reduced control policies which feedback only those closed loop modal coordinates which are most critical to the quadratic control performance criterion. In this way, the modes which should be controlled (and hence the modes which must be observable by choice of measurements), are deduced from truncations of the optimal controller.
    Keywords: CYBERNETICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Ultrasonic robot localization using Dempster-Shafer theory (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A localization algorithm for ultrasonic robot described is based on range readings from wide beam ultrasonic transducers to built a model of the empty regions in the room. The method is incorporated into a move-to-station behavior which was demonstrated on the Georgia Tech mobile robot. A belief model of the range of readings that was based on Dempster-Shafer theory was used to compute the belief of points in the environment being empty, occupied, or unknown. The current belief in the empty space was used to construct a weighted centroid of the empty space after each move of the robot. By moving toward this center of mass and continually adding to the beliefs of the point in the environment the robot iteratively moved to the center of the open space.
    Keywords: CYBERNETICS
    Type: In: Neural and stochastic methods in image and signal processing; Proceedings of the Meeting, San Diego, CA, July 20-23, 1992 (A93-32905 12-63); p. 2-11.
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    NASA TECHNICAL REPORTS
  • 6
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    GenSAA - Advancing satellite monitoring with expert systems (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: During numerous contacts with a satellite each day, spacecraft analysts must closely monitor real time data watching for combinations of telemetry parameter values, trends, and other indications that may signify a problem or failure. At the NASA Goddard Space Flight Center, fault-isolation expert systems are currently in operation supporting this data monitoring task. Based on the lessons learned during these initial efforts in expert system automation, a new domain-specific expert system development tool is being developed to facilitate the rapid development and reuse of real-time expert systems to serve as fault-isolation assistants for spacecraft analysts.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 91-3948 , AIAA Computing in Aerospace Conference; Oct 21, 1991 - Oct 24, 1991; Baltimore, MD; United States
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  • 7
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    Integrating expert systems into an operational environment (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Communications Link Expert Assistance Resource Expert System is introduced. The experience gained in implementing this expert system is used to discuss solutions to the major problems encountered during the development of an expert system to be realized in an operational environment. Knowledge acquisition is discussed as well as user involvement, interfacing the system to the user, choosing a development environment, prototyping for success, and overcoming the transition.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 89-3003 , AIAA Computers in Aerospace Conference; Oct 03, 1989 - Oct 05, 1989; Monterey, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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