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  • CYBERNETICS  (3)
  • DOCUMENTATION AND INFORMATION SCIENCE  (3)
  • Astrophysics
  • Mice
  • 2015-2019  (2)
  • 1990-1994  (6)
  • 1
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    Storage needs in future supercomputer environments (1992)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: The Lawrence Livermore National Laboratory (LLNL) is a Department of Energy contractor, managed by the University of California since 1952. Major projects at the Laboratory include the Strategic Defense Initiative, nuclear weapon design, magnetic and laser fusion, laser isotope separation, and weather modeling. The Laboratory employs about 8,000 people. There are two major computer centers: The Livermore Computer Center and the National Energy Research Supercomputer Center. As we increase the computing capacity of LLNL systems and develop new applications, the need for archival capacity will increase. Rather than quantify that increase, I will discuss the hardware and software architectures that we will need to support advanced applications.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, NSSDC Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications, Volume 3; 13 p
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  • 2
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    Storage needs in future supercomputer environments (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: As the computing capacity of the Lawrence Livermore National Laboratory (LLNL) systems is increased and new applications are developed, the need for archival capacity will increase. The hardware and software architectures that will be needed to support advanced applications are discussed. Viewgraphs are included.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, Proceedings of the NSSDC Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications; p 276-295
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  • 3
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    A neural network simulation package in CLIPS (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The intrinsic similarity between the firing of a rule and the firing of a neuron has been captured in this research to provide a neural network development system within an existing production system (CLIPS). A very important by-product of this research has been the emergence of an integrated technique of using rule based systems in conjunction with the neural networks to solve complex problems. The systems provides a tool kit for an integrated use of the two techniques and is also extendible to accommodate other AI techniques like the semantic networks, connectionist networks, and even the petri nets. This integrated technique can be very useful in solving complex AI problems.
    Keywords: CYBERNETICS
    Type: NASA. Johnson Space Center, First CLIPS Conference Proceedings, Volume 2; p 554-568
    Format: application/pdf
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  • 4
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    Mass storage system reference model, Version 4 (1993)
    In:  Other Sources
    Details
    Publication Date: 2016-03-10
    Description: The high-level abstractions that underlie modern storage systems are identified. The information to generate the model was collected from major practitioners who have built and operated large storage facilities, and represents a distillation of the wisdom they have acquired over the years. The model provides a common terminology and set of concepts to allow existing systems to be examined and new systems to be discussed and built. It is intended that the model and the interfaces identified from it will allow and encourage vendors to develop mutually-compatible storage components that can be combined to form integrated storage systems and services. The reference model presents an abstract view of the concepts and organization of storage systems. From this abstraction will come the identification of the interfaces and modules that will be used in IEEE storage system standards. The model is not yet suitable as a standard; it does not contain implementation decisions, such as how abstract objects should be broken up into software modules or how software modules should be mapped to hosts; it does not give policy specifications, such as when files should be migrated; does not describe how the abstract objects should be used or connected; and does not refer to specific hardware components. In particular, it does not fully specify the interfaces.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, Goddard Conference on Mass Storage Systems and Technologies, Volume 1,; p 1-72
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  • 5
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    On the Persistence of QPOs During the SGR 1806-20 Giant Flare (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-07-09
    Description: The discovery of quasi-periodic brightness oscillations (QPOs) in the X-ray emission accompanying the giant flares of the soft gamma-ray repeaters SGR 180620 and SGR 1900+14 has led to intense speculation about their nature and what they might reveal about the interiors of neutron stars. Here we take a fresh look at the giant flare data for SGR 180620, and in particular we analyze short segments of the post-peak emission using a Bayesian procedure, which has not previously been applied to these data. We find at best weak evidence that any QPO persists for more than ~1 s; instead, almost all the data are consistent with a picture in which there are numerous independently excited modes that decay within a few tenths of a second. This has interesting implications for the rapidity of decay of the QPO modes, which could occur by the previously suggested mechanism of coupling to the MHD continuum. The strongest QPOs favor certain rotational phases, which might suggest special regions of the crust or of the magnetosphere. We also find several previously unreported QPOs in these data, which may help in tracking down their origin.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN68610 , The Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 871; 1; 95
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  • 6
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    A Search for High-Energy Counterparts to Fast Radio Bursts (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-11-30
    Description: We report on a search for high-energy counterparts to fast radio bursts (FRBs) with the Fermi Gamma-ray Burst Monitor, Fermi Large Area Telescope, and the Neil Gehrels Swift Observatory Burst Alert Telescope. We find no significant associations for any of the 23 FRBs in our sample, but report upper limits to the high-energy fluence for each on timescales of 0.1, 1, 10, and 100 s. We report lower limits on the ratio of the radio to high-energy fluence, f(sub r) /f(sub ), for timescales of 0.1 and 100 s. We discuss the implications of our non-detections on various proposed progenitor models for FRBs, including analogs of giant pulses from the Crab pulsar and hyperflares from magnetars. This work demonstrates the utility of analyses of high-energy data for FRBs in tracking down the nature of these elusive sources..
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN75257 , Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 879; 1; 40
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  • 7
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    Design of linear quadratic regulators with eigenvalue placement in a specified region (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Two linear quadratic regulators are developed for placing the closed-loop poles of linear multivariable continuous-time systems within the common region of an open sector, bounded by lines inclined at +/- pi/2k (for a specified integer k not less than 1) from the negative real axis, and the left-hand side of a line parallel to the imaginary axis in the complex s-plane, and simultaneously minimizing a quadratic performance index. The design procedure mainly involves the solution of either Liapunov equations or Riccati equations. The general expression for finding the lower bound of a constant gain gamma is also developed.
    Keywords: CYBERNETICS
    Type: Control-Theory and Advanced Technology (ISSN 0911-0704); 6; 1; p. 93-110.
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  • 8
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    Optimal digital redesign of continuous-time controllers (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper proposes a new optimal digital redesign technique for finding a dynamic digital control law from the available analog counterpart and simultaneously minimizing a quadratic performance index. The proposed technique can be applied to a system with a more general class of reference inputs, and the developed digital regulator can be implemented using low cost microcomputers.
    Keywords: CYBERNETICS
    Type: Computers and Mathematics with Applications (ISSN 0097-4943); 22; 1; p. 25-35.
    Format: text
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