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  • 11
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    Three real-time architectures - A study using reward models (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Numerous applications in the area of computer system analysis can be effectively studied with Markov reward models. These models describe the evolutionary behavior of the computer system by a continuous-time Markov chain, and a reward rate is associated with each state. In reliability/availability models, upstates have reward rate 1, and down states have reward rate zero associated with them. In a combined model of performance and reliability, the reward rate of a state may be the computational capacity, or a related performance measure. Steady-state expected reward rate and expected instantaneous reward rate are clearly useful measures which can be extracted from the Markov reward model. The diversity of areas where Markov reward models may be used is illustrated with a comparative study of three examples of interest to the fault tolerant computing community.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Analysis and design of space vehicle flight control systems. Volume X - Man in the loop (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Methods for use in design and analysis of space vehicle flight control systems - recommendations for placing man in control loop of boosters
    Keywords: SPACE VEHICLES
    Type: NASA-CR-829 , GD/C-DDE66-023
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    An Analysis of Applications Development Systems for Remotely Sensed, Multispectral Data for the Earth Observations Division of the NASA Lyndon B. Johnson Space Center (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An application development system (ADS) is examined for remotely sensed, multispectral data at the Earth Observations Division (EOD) at Johnson Space Center. Design goals are detailed, along with design objectives that an ideal system should contain. The design objectives were arranged according to the priorities of EOD's program objectives. Four systems available to EOD were then measured against the ideal ADS as defined by the design objectives and their associated priorities. This was accomplished by rating each of the systems on each of the design objectives. Utilizing the established priorities, it was determined how each system stood up as an ADS. Recommendations were made as to possible courses of action for EOD to pursue to obtain a more efficient ADS.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-140345 , REPT-275-025-018
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    Fatigue Countermeasures: Alertness Management in Flight Operations (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Since 1980, the NASA Ames Fatigue Countermeasures Program has studied the effects and impact of fatigue on flight operations . Sleep loss and circadian disruption are two of the primary physiological factors that underlie fatigue in flight operations. The Program has developed an array of fatigue countermeasure recommendations that can be used to combat the effects of fatigue and continues to research potential new countermeasures. For example, one such strategy involved a NASA/FAA study on the effects of planned cockpit rest to improve crewmember alertness and performance. Based partly on the study results, the FAA is currently reviewing a proposed Advisory Circular for controlled rest on the flight deck. Since there is no simple answer to the issue of fatigue in aviation, an Education and Training Module has been developed to provide the industry with pertinent information on sleep, circadian rhythms, how flight operations affect these physiological factors, and recommendations for fatigue countermeasures. The Module will be updated as the Program's continued research efforts uncover new information and develop new countermeasure strategies,
    Keywords: Behavioral Sciences
    Type: Southern California Safety Institute Meeting; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    Reducing transport delay through improvements in real-time program flow (1992)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper describes the process of measuring and reducing software-transport delays through careful analysis, and modifications of real-time programs. A 737 program is analyzed and modified to improve the simulation overall transport delay by approximately 30 percent. The transport delay was improved through modification to the real-time program flow and the implementation of quaternions in the calculation of the math model.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 92-4147 , AIAA/AHS Flight Simulation Technologies Conference; Aug 24, 1992 - Aug 26, 1992; Hilton Head Island, SC; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 16
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    A method for determining transport delays in the flight simulation environment (1991)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper will describe the process of transport delay measurement along several points in the signal path for a piloted flight simulation. Several transport delay measurement techniques were compared to determine the accuracy and ease of use of each method. Measurements were made in both the frequency and time domain. The transport delays for individual pieces of equipment as well as the math model of the simulated vehicle are measured and broken out from the system's total transport delay.
    Keywords: COMPUTER SYSTEMS
    Type: AIAA PAPER 91-2964 , AIAA Flight Simulation Technologies Conference; Aug 12, 1991 - Aug 14, 1991; New Orleans, LA; United States
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    NASA TECHNICAL REPORTS
  • 17
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    The PARTY parallel runtime system (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: In the present automated system for the organization of the data and computational operations entailed by parallel problems, in ways that optimize multiprocessor performance, general heuristics for partitioning program data and control are implemented by capturing and manipulating representations of a computation at run time. These heuristics are directed toward the dynamic identification and allocation of concurrent work in computations with irregular computational patterns. An optimized static-workload partitioning is computed for such repetitive-computation pattern problems as the iterative ones employed in scientific computation.
    Keywords: COMPUTER SYSTEMS
    Type: SIAM Conference on Parrallel Processing for Scientific Computing; Dec 01, 1987 - Dec 04, 1987; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 18
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    Mapping Electrical Crosstalk in Pixelated Sensor Arrays (2008)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Electronic coupling effects such as Inter-Pixel Capacitance (IPC) affect the quantitative interpretation of image data from CMOS, hybrid visible and infrared imagers alike. Existing methods of characterizing IPC do not provide a map of the spatial variation of IPC over all pixels. We demonstrate a deterministic method that provides a direct quantitative map of the crosstalk across an imager. The approach requires only the ability to reset single pixels to an arbitrary voltage, different from the rest of the imager. No illumination source is required. Mapping IPC independently for each pixel is also made practical by the greater S/N ratio achievable for an electrical stimulus than for an optical stimulus, which is subject to both Poisson statistics and diffusion effects of photo-generated charge. The data we present illustrates a more complex picture of IPC in Teledyne HgCdTe and HyViSi focal plane arrays than is presently understood, including the presence of a newly discovered, long range IPC in the HyViSi FPA that extends tens of pixels in distance, likely stemming from extended field effects in the fully depleted substrate. The sensitivity of the measurement approach has been shown to be good enough to distinguish spatial structure in IPC of the order of 0.1%.
    Keywords: Instrumentation and Photography; Electronics and Electrical Engineering
    Type: SPIE Conference on Astronomical Instrumentation; Jun 23, 2008 - Jun 28, 2008; Marseille; France
    Format: text
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    NASA TECHNICAL REPORTS
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