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  • 1
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    Feasibility of expert systems to enhance Space Station subsystem controllers (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results are described from a project to build a prototype expert system for automated fault isolation and correction of a regenerative CO2 removal device that is typical of functions of the air revitalization group in the Space Station environmental control and life support system (ECLSS). The software was developed using one of the powerful commercial knowledge engineering environments. The goal of the project was to evaluate the feasibility of using a software development environment to rapidly design, construct, test, and change expert system software. The use of expert systems to enhance automatic controllers and the use of information on device design and on device troubleshooting and repair procedures in developing expert systems are discussed.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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    NASA TECHNICAL REPORTS
  • 2
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    An expert systems approach to automated fault diagnostics (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The implementation of the life support function on the Space Station will probably have to be based on regenerative life support techniques. It is essential that the regenerative subsystems operate with minimum attendance from the crew. However, the results of extensive testing show that uninterrupted subsystem operation over long periods of time (e.g., months) is not easy to achieve. In order to achieve longer periods of time on line for these subsystems, it is necessary that the Environmental Control and Life Support System (ECLSS) designers focus their attention on technologies which will permit both increasing the mean time between shutdowns and decreasing the time for which a subsystem is down for fault diagnosis and maintenance. With the aim to be able to perform the fault diagnosis on line rather than after the subsystem has shut down, an expert systems approach to automated fault diagnostics is considered. A description is given of a program, designated CS-1 'FIXER' for fault isolation expert to enhance reliability.
    Keywords: COMPUTER SYSTEMS
    Type: SAE PAPER 851380
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  • 3
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    An expert systems approach to automated fault management in a regenerative life support subsystem (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: This paper describes FIXER, a prototype expert system for automated fault management in a regenerative life support subsystem typical of Space Station applications. The development project provided an evaluation of the use of expert systems technology to enhance controller functions in space subsystems. The software development approach permitted evaluation of the effectiveness of direct involvement of the expert in design and development. The approach also permitted intensive observation of the knowledge and methods of the expert. This paper describes the development of the prototype expert system and presents results of the evaluation.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: AIAA PAPER 86-0321
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    NASA TECHNICAL REPORTS
  • 4
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    Sample selection in foreign similarity regions for multicrop experiments (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The selection of sample segments in the U.S. foreign similarity regions for development of proportion estimation procedures and error modeling for Argentina, Australia, Brazil, and USSR in AgRISTARS is described. Each sample was chosen to be similar in crop mix to the corresponding indicator region sample. Data sets, methods of selection, and resulting samples are discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10118 , NASA-CR-167439 , NAS 1.26:167439 , FC-L1-04120-JSC-17401 , LEMSCO-16663
    Format: application/pdf
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  • 5
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    AgRISTARS: Foreign commodity production forecasting. The 1980 US corn and soybeans exploratory experiment (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The U.S. corn and soybeans exploratory experiment is described which consisted of evaluations of two technology components of a production forecasting system: classification procedures (crop labeling and proportion estimation at the level of a sampling unit) and sampling and aggregation procedures. The results from the labeling evaluations indicate that the corn and soybeans labeling procedure works very well in the U.S. corn belt with full season (after tasseling) LANDSAT data. The procedure should be readily adaptable to corn and soybeans labeling required for subsequent exploratory experiments or pilot tests. The machine classification procedures evaluated in this experiment were not effective in improving the proportion estimates. The corn proportions produced by the machine procedures had a large bias when the bias correction was not performed. This bias was caused by the manner in which the machine procedures handled spectrally impure pixels. The simulation test indicated that the weighted aggregation procedure performed quite well. Although further work can be done to improve both the simulation tests and the aggregation procedure, the results of this test show that the procedure should serve as a useful baseline procedure in future exploratory experiments and pilot tests.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10206 , NASA-CR-167485 , JSC-17138 , NAS 1.26:167485 , LEMSCO-16573 , FC-L1-04096
    Format: application/pdf
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  • 6
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    Acquisition history simulation for evaluation of Landsat-based crop inventory systems (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper describes the development and evaluation of a simulation procedure which produces patterns of Landsat data loss attributable to cloud patterns that are characteristic of a crop region. This simulation procedure is part of a simulation system under development which evaluates the performance of crop inventory system components over a number of years and under a variety of conditions.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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  • 7
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    Update on a system for large area crop inventory from remotely sensed data (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: In connection with the conduction of the Large Area Crop Inventory Experiment (LACIE), a state-of-the-art technology for the inventory of crops using satellite data was developed and tested over a period of three years (1975-77). A method was obtained for determining the total wheat production in a given region by looking at only a subset of its area. The present investigation is concerned with the current state of the art as obtained in the aggregation technology of the Agriculture and Resources Inventory Surveys Through Aerospace Remote Sensing (AgRISTARS) program. Attention is given to details of AgRISTARS baseline aggregation technology, and to recent improvements and future research directions.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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