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  • Computer Systems  (2)
  • Communications and Radar  (1)
  • Chemistry
  • Numerical Analysis
  • 2005-2009  (3)
  • 1995-1999
  • 1930-1934
  • 1925-1929
  • 2005  (3)
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  • 2005-2009  (3)
  • 1995-1999
  • 1930-1934
  • 1925-1929
Year
  • 1
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    Optical Design of an Optical Communications Terminal (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An optical communications terminal (OCT) is being developed to enable transmission of data at a rate as high as 2.5 Gb/s, from an aircraft or spacecraft to a ground station. In addition to transmitting high data rates, OCT will also be capable of bidirectional communications.
    Keywords: Communications and Radar
    Type: NPO-30537 , NASA Tech Briefs, October 2005; 29-30
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Hybrid Systems Diagnosis (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: This paper reports on an on-going Project to investigate techniques to diagnose complex dynamical systems that are modeled as hybrid systems. In particular, we examine continuous systems with embedded supervisory controllers that experience abrupt, partial or full failure of component devices. We cast the diagnosis problem as a model selection problem. To reduce the space of potential models under consideration, we exploit techniques from qualitative reasoning to conjecture an initial set of qualitative candidate diagnoses, which induce a smaller set of models. We refine these diagnoses using parameter estimation and model fitting techniques. As a motivating case study, we have examined the problem of diagnosing NASA's Sprint AERCam, a small spherical robotic camera unit with 12 thrusters that enable both linear and rotational motion.
    Keywords: Computer Systems
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    An Application-Based Performance Characterization of the Columbia Supercluster (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Columbia is a 10,240-processor supercluster consisting of 20 Altix nodes with 512 processors each, and currently ranked as the second-fastest computer in the world. In this paper, we present the performance characteristics of Columbia obtained on up to four computing nodes interconnected via the InfiniBand and/or NUMAlink4 communication fabrics. We evaluate floating-point performance, memory bandwidth, message passing communication speeds, and compilers using a subset of the HPC Challenge benchmarks, and some of the NAS Parallel Benchmarks including the multi-zone versions. We present detailed performance results for three scientific applications of interest to NASA, one from molecular dynamics, and two from computational fluid dynamics. Our results show that both the NUMAlink4 and the InfiniBand hold promise for application scaling to a large number of processors.
    Keywords: Computer Systems
    Type: Supercomputing Conference 2005; Nov 12, 2005 - Nov 18, 2005; Seattle, WA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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