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  • COMPUTER PROGRAMMING AND SOFTWARE  (3)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (3)
  • 1990-1994  (6)
  • 1940-1944
  • 1905-1909
  • 1
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    Perceptual and performance consequences of flight in virtual worlds (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: There are two primary purposes for head-mounted systems in aeronautical settings. One is for helmet-mounted sights and teleoperated (head-slaved) weapons systems. Bennett, Johnson, Perrone, and Phatak (1988) evaluated head tracking performance during passive and controlled flight. In that study, comparisons were also made of head tracking performance in sterile and relatively complex virtual worlds. That study confirmed the robustness of head tracking performance across a wide variety of visual scenes. A second use of virtual world displays is for aircraft control. Aircraft controllability using head-mounted, panel-mounted, or simulated out-the-window scenes has been systematically examined. Those studies reported the range of rotorcraft flight tasks in which head-mounted virtual worlds provided some advantages. Two studies will be reported that examine the perceptual/performance effects of virtual worlds. The first examines head tracking performance with roll-stabilized versus non-roll stabilized virtual worlds. The purpose of the study was to (1) examine display strategies used in current display systems and (2) study the adaptability of observers to estimated glide slope angles using head-slaved versus head-stabilized imagery. The purpose of this study was to examine the usefulness of wide field-of-regards during final approaches to a runway.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Human Machine Interfaces for Teleoperators and Virtual Environments; p 114
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Low-temperature thermal control for a lunar base (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The generic problem of rejecting low- to moderate-temperature heat from space facilities located in a hot thermal sink environment is studied, and the example of a lunar base located near the equator is described. The effective thermal sink temperature is often above or near nominal room temperature. A three heat pump assisted thermal bus concept appears to be the most viable as they are the least sensitive to environmental conditions. Weight estimates are also developed for each of the five thermal control concepts studied: (1) 149kg/kW for a central thermal loop with unitary heat pumps; (2) 133 kg/kW for a conventional bus connected to large, central heat pumps at the radiator; (3) 134 kg/kW for a central, dual loop heat pump concept; (4) 95 kg/kW for the selective field-of-view radiator; and (5) 126 kg/kW for the regolith concept.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 901242
    Format: text
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  • 3
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    Technique and applications of device driver dynamic loading (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper discusses the techniques and feasibility of dynamically loading device drivers for the real-time operating system of the Space Station Freedom Data Management System. The rationale and advantages of device driver dynamic loading are discussed and the procedures are analyzed. A prototype program is implemented to demonstrate the feasibility and to simplify the procedure of device driver dynamic loading for the Space Station Freedom Program.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 93-4524 , In: AIAA Computing in Aerospace Conference, 9th, San Diego, CA, Oct. 19-21, 1993, Technical Papers. Pt. 1 (A94-11401 01-62); p. 390-394.
    Format: text
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  • 4
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    Study of the Alsys implementation of the Catalogue of Interface Features and Options for the Ada language for 80386 Unix (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A set of programs was written to test the functionality and performance of the Alsys Ada implementation of the Catalogue of Interface Features and Options (CIFO), a set of optional Ada packages for real-time applications. No problems were found with the task id, preemption control, or shared-data packages. Minor problems were found with the dispatching control, dynamic priority, events, non-waiting entry call, semaphore, and scheduling packages. The Alsys implementation is derived mostly from Release 2 of the CIFO standard, but includes some of the features of Release 3 and some modifications unique to Alsys. Performance measurements show that the semaphore and shared-data features are an order-of-magnitude faster than the same mechanisms using an Ada rendezvous. The non-waiting entry call is slightly faster than a standard rendezvous. The existence of errors in the implementation, the incompleteness of the documentation from the published standard impair the usefulness of this implementation. Despite those short-comings, the Alsys CIFO implementation might be of value in the development of real-time applications.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 93-4628 , In: AIAA Computing in Aerospace Conference, 9th, San Diego, CA, Oct. 19-21, 1993, Technical Papers. Pt. 2 (A94-11401 01-62); p. 908-914.
    Format: text
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  • 5
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    A data distributed parallel algorithm for ray-traced volume rendering (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper presents a divide-and-conquer ray-traced volume rendering algorithm and a parallel image compositing method, along with their implementation and performance on the Connection Machine CM-5, and networked workstations. This algorithm distributes both the data and the computations to individual processing units to achieve fast, high-quality rendering of high-resolution data. The volume data, once distributed, is left intact. The processing nodes perform local ray tracing of their subvolume concurrently. No communication between processing units is needed during this locally ray-tracing process. A subimage is generated by each processing unit and the final image is obtained by compositing subimages in the proper order, which can be determined a priori. Test results on both the CM-5 and a group of networked workstations demonstrate the practicality of our rendering algorithm and compositing method.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-191520 , NAS 1.26:191520 , ICASE-93-59 , AD-A270501
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  • 6
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    Biodeterioration of materials in water reclamation systems (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The chemicals produced by the microbial processes involved in the 'biofilms' which form on the surfaces of manned spacecraft water reclamation systems encompass both metals and organic poisons; both are potential hazards to astronaut health and the growth of the plants envisioned for closed-cycle life support systems. Image analysis is here shown to be a very useful technique for the study of biofilm formation on candidate water-processor materials for Space Station Freedom. The biodeterioration of materials exposed to biofilms can be swiftly evaluated by means of electrochemical impedance spectroscopy.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 921311 , ; 7 p.|SAE, International Conference on Environmental Systems; Jul 13, 1992 - Jul 16, 1992; Seattle, WA; United States
    Format: text
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