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  • Other Sources  (4)
  • 1990-1994  (4)
  • 1
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    Measurements of radar backscatter from an artificial tree - An indication of azimuthal variations and polarization sensitivity of trees (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Measurements of radar backscatter from an artificial tree were made in the laboratory at 6 and 10 GHz at horizontal incidence. The system had a resolution cylinder 18 cm in diameter and 11 cm long, so about half of the tree (30.5 cm high) was within the beam. The mean returned power from the target with leaves was always higher than that from the target without leaves, as expected. The signal faded with an exponential distribution when the artificial tree was rotated about its trunk, with no angular trend apparent. When the leaves were present, tilted polarizations gave results favoring an angle corresponding with that of the branches. When leaves were absent, the trunk of the tree dominated the radar backscatter at all polarizations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 12; 401-417
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A distributed scheduling algorithm for heterogeneous real-time systems (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Much of the previous work on load balancing and scheduling in distributed environments was concerned with homogeneous systems and homogeneous loads. Several of the results indicated that random policies are as effective as other more complex load allocation policies. The effects of heterogeneity on scheduling algorithms for hard real time systems is examined. A distributed scheduler specifically to handle heterogeneities in both nodes and node traffic is proposed. The performance of the algorithm is measured in terms of the percentage of jobs discarded. While a random task allocation is very sensitive to heterogeneities, the algorithm is shown to be robust to such non-uniformities in system components and load.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: Performance Related Issues in Distributed Database Systems; 11 p
    Format: application/pdf
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  • 3
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    Measuring the effects of heterogeneity on distributed systems (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Distributed computer systems in daily use are becoming more and more heterogeneous. Currently, much of the design and analysis studies of such systems assume homogeneity. This assumption of homogeneity has been mainly driven by the resulting simplicity in modeling and analysis. A simulation study is presented which investigated the effects of heterogeneity on scheduling algorithms for hard real time distributed systems. In contrast to previous results which indicate that random scheduling may be as good as a more complex scheduler, this algorithm is shown to be consistently better than a random scheduler. This conclusion is more prevalent at high workloads as well as at high levels of heterogeneity.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: Performance Related Issues in Distributed Database Systems; 6 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    On the transmission of partial information: inferences from movement-related brain potentials (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results are reported from a new paradigm that uses movement-related brain potentials to detect response preparation based on partial information. The paradigm uses a hybrid choice-reaction go/nogo procedure in which decisions about response hand and whether to respond are based on separate stimulus attributes. A lateral asymmetry in the movement-related brain potential was found on nogo trials without overt movement. The direction of this asymmetry depended primarily on the signaled response hand rather than on properties of the stimulus. When the asymmetry first appeared was influenced by the time required to select the signaled hand, and when it began to differ on go and nogo trials was influenced by the time to decide whether to respond. These findings indicate that both stimulus attributes were processed in parallel and that the asymmetry reflected preparation of the response hand that began before the go/nogo decision was completed.
    Keywords: Behavioral Sciences
    Type: Journal of experimental psychology. Human perception and performance (ISSN 0096-1523); 18; 1; 217-32
    Format: text
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