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  • Other Sources  (14)
  • 1990-1994  (14)
  • 1
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    CLIPS meets the connection machine: Or how to create a parallel production system (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Production systems usually present unacceptable run-times when faced with applications requiring tens of thousands to millions of facts. Many efforts have focused on the use of parallelism as a way to increase overall system performance. While these efforts have increased pattern matching and rule evaluation rates, they have only indirectly dealt with the problems faced by fact burdened applications. We have implemented PPS, a version of CLIPS running on the Connection Machine, to directly address the problems faced by these applications. This paper will describe our system, discuss its implementation, and present results.
    Keywords: COMPUTER SYSTEMS
    Type: NASA. Johnson Space Center, First CLIPS Conference Proceedings, Volume 2; p 594-602
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  • 2
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    Doppler velocities in the ion tail of comet Levy 1990c (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: We have obtained time alternating sequences of column density maps and Doppler velocity fields in the plasma tail of comet Levy 1990c. We describe the observing technique and data analysis, and we present first results.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991; p 265-268
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  • 3
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    H2O(+) structures in the inner plasma tail of comet Austin (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: We present images of comet Austin 1989c1 in the light of H2O(+) from which the contribution of the dust continuum and the gas coma was completely removed. We describe the behavior of the H2O(+) plasma in the inner coma where it is reliably observed for the first time.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991; p 257-260
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  • 4
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    Observations of comet Levy 1990c in the (OI) 6300-A line with an imaging Fabry-Perot (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: We have observed the comet Levy 1990c during 16-25 August 1990 using the MPAE focal reducer system based Fabry-Perot etalon coupled with the 1 meter telescope of the Observatory of Hoher List. The free spectral range and resolution limit of the interferometer was approximately 2.18 A and approximately 0.171 A respectively. Classical Fabry-Perot fringes were recorded on a CCD in the cometary (OI) 6300 A line. They are well resolved from telluric air glow and cometary NH2 emission. Our observations indicate that the (OI) is distributed asymmetrically with respect to the center of the comet. In this paper we report the spatial distribution of (OI) emission and its line width in the coma of comet Levy.
    Keywords: ASTRONOMY
    Type: Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991; p 477-480
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  • 5
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    The manned transportation system study - Defining human pathways into space (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Substantiating data developed by a NASA-industry team (NIT) for subsequent NASA decisions on the 'right' set of manned transportation elements needed for human access to space are discussed. Attention is given to the framework for detailed definition of these manned transportation elements. Identifying and defining architecture evaluation criteria, i.e., attributes, specified the amount and type of data needed for each concept under consideration. Several architectures, each beginning with today's transportation systems, were defined using representative systems to explore future options and address specific questions currently being debated. The present solutions emphasize affordability, safety, routineness, and reliability. Key issues associated with current business practices were challenged and the impact associated with these practices quantified.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 92-1701
    Format: text
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  • 6
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    Defining the manned transportation system strategy for the United States (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Recent work completed by a NASA-Industry Team designed to identify the requirements for the U.S. manned transportation system (MTS) is presented. This MTS study was designed to address important outstanding issues concerning present systems and what the configuration and capabilities of a new manned vehicle should be. The rigorous process developed is measurable and repeatable and helps define a coherent and integrated strategy for which space launch vehicle concepts can be defined for future manned transportation to space.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: IAF PAPER 92-0853
    Format: text
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  • 7
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    The impact of new business approaches derived from the Manned Transportation System Study (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The results are reported of a survey conducted among senior managers within the government and participating companies to identify the items that could improve industry's way of doing business with NASA. New and recommended practices in management, operations, organization, procurement, and procedures are discussed. The development of multitiered requirement systems for NASA programs is addressed.
    Keywords: ADMINISTRATION AND MANAGEMENT
    Type: AIAA PAPER 92-1706
    Format: text
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  • 8
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    The Manned Transportation System Study - Attributes and their measurements (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Attention is given to the Manned Transportation System (MTS) Study, initiated to help identify the 'right' transportation system architectures needed for human access to space. A listing of the requirements used for this study and the rationale behind them are given. Attributes allow comparison of elements that meet the requirements and the 'needs' (mission model). The attributes include: safety, probability of mission success, funding profile, architecture cost risk, schedule confidence, dependability, availability, mission growth potential, environment, resiliency, and alternate access. The attributes need to be measurable, to have repeatable calculations and well-defined assumptions, to have their weight determined relative to other attributes, and to be a discriminator. The process used to determine the attributes, which involved the MTS team forum and some of the quality function deployment techniques, is discussed.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 92-1703
    Format: text
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  • 9
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    Architecture options for the Manned Transportation Systems Study (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Manned Transportation System (MTS) Study has constructed a comprehensive set of transportation architectures, using current and possible vehicle systems to address specifically a series of considerations which focus and guide what the future transportation architectures should be. Payload manifesting ground rules are presented to illustrate the present approach in establishing flight rates from the MTS mission models. Manned system flight rates and relative personnel safety characteristics differences are presented.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 92-1704
    Format: text
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  • 10
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    Human Transportation System (HTS) study, volume 1 (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Work completed under the Human Transportation System Study is summarized. This study was conducted by the New Initiatives Office at JSC with the technical support of Boeing, General Dynamics, Lockheed, McDonnell-Douglas, Martin Marietta, and Rockwell. The study was designed to generate information on determining the appropriate path to follow for new system development to meet the Nation's space transportation needs. The study evaluates 18 transportation architecture options using a parametric set of mission requirements. These options include use of current systems as well as proposed systems to assess the impact of various considerations, such as the cost of alternate access, or the benefit of separating people and cargo. The architecture options are compared to each other with six measurable evaluation criteria or attributes. They are the following: funding profile, human safety, probability of mission success, architecture cost risk, launch schedule confidence, and environmental impact. Values for these attributes are presented for the architecture options, with pertinent conclusions and recommendations.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-104779 , S-739-VOL-1 , NAS 1.15:104779
    Format: application/pdf
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