Design, development and demonstration of a warm gas distribution system Quarterly report, period ending 31 Dec. 1967
Development of warm distribution system for hydrazine fueled gas generators for spacecraft attitude control torques
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Synthesis of distributed systems Annual report, 1 Sep. 1967 - 31 Aug. 1968
Synthesis of distributed systems with application to feedback networks for phase shift oscillators
Cohen, G. H.↗
The implementation and use of Ada on distributed systems with high reliability requirements
The use and implementation of Ada were investigated in distributed environments in which reliability is the primary concern. In particular, the focus was on the possibility that a distributed system may be programmed entirely in Ada so that the individual tasks of the system are unconcerned with which processors are being executed, and that failures may occur in the software and underlying hardware. A secondary interest is in the performance of Ada systems and how that performance can be gauged reliably. Primary activities included: analysis of the original approach to recovery in distributed Ada programs using the Advanced Transport Operating System (ATOPS) example; review and assessment of the original approach which was found to be capable of improvement; development of a refined approach to recovery that was applied to the ATOPS example; and design and development of a performance assessment scheme for Ada programs based on a flexible user-driven benchmarking system.
Knight, J. C.↗
The function of the earth observing system - Data information system Distributed Active Archive Centers
The functionality of the Distributed Active Archive Centers (DAACs) which are significant elements of the Earth Observing System Data and Information System (EOSDIS) is discussed. Each DAAC encompasses the information management system, the data archival and distribution system, and the product generation system. The EOSDIS DAACs are expected to improve the access to earth science data set needed for global change research.
Lapenta, C. C.↗
Prototyping a large-scale distributed system for the Great Observatories era - NASA Astrophysics Data System (ADS)
The NASA Astrophysics Data System (ADS) is a distributed information system intended to support research in the Great Observatories era, to simplify access to data, and to enable simultaneous analyses of multispectral data sets. Here, the user agent and interface, its functions, and system components are examined, and the system architecture and infrastructure is addressed. The present status of the system and related future activities are examined.
Shames, Peter↗
Proceedings of the Workshop on Applications of Distributed System Theory to the Control of Large Space Structures
Two general themes in the control of large space structures are addressed: control theory for distributed parameter systems and distributed control for systems requiring spatially-distributed multipoint sensing and actuation. Topics include modeling and control, stabilization, and estimation and identification.
Rodriguez, G.↗
A study of a space communication system for the control and monitoring of the electric distribution system. Volume 2: Supporting data and analyses
It is technically feasible to design a satellite communication system to serve the United States electric utility industry's needs relative to load management, real-time operations management, remote meter reading and to determine the costs of various elements of the system. The functions associated with distribution automation and control and communication system requirements are defined. Factors related to formulating viable communication concepts, the relationship of various design factors to utility operating practices, and the results of the cost analysis are discussed The system concept and several ways in which the concept could be integrated into the utility industry are described.
Vaisnys, A.↗
Design of the Tunnel Transfer Line of PIP-II Cryogenic Distribution System
Design of the Tunnel Transfer Line of PIP-II Cryogenic Distribution System
Patel, V. [Fermilab]↗
DMTN-093: Design of the LSST Alert Distribution System
We describe the proposed design and implementation of the LSST Alert Distribution System, which provides rapid dissemination of alerts to community alert brokers. At time of writing, this service is still under development; this “living document” describes current thinking, but is expected to evolve over the course of LSST construction.
79 ASTRONOMY AND ASTROPHYSICS↗
The implementation and use of Ada on distributed systems with high reliability requirements
The use and implementation of Ada in distributed environments in which reliability is the primary concern is investigated. Emphasis is placed on the possibility that a distributed system may be programmed entirely in ADA so that the individual tasks of the system are unconcerned with which processors they are executing on, and that failures may occur in the software or underlying hardware. The primary activities are: (1) Continued development and testing of our fault-tolerant Ada testbed; (2) consideration of desirable language changes to allow Ada to provide useful semantics for failure; (3) analysis of the inadequacies of existing software fault tolerance strategies.
Knight, J. C.↗
The implementation and use of Ada on distributed systems with high reliability requirements
The use and implementation of Ada in distributed environments in which reliability is the primary concern were investigted. A distributed system, programmed entirely in Ada, was studied to assess the use of individual tasks without concern for the processor used. Continued development and testing of the fault tolerant Ada testbed; development of suggested changes to Ada to cope with the failures of interest; design of approaches to fault tolerant software in real time systems, and the integration of these ideas into Ada; and the preparation of various papers and presentations were discussed.
Knight, J. C.↗
The implementation and use of Ada on distributed systems with high reliability requirements
The use and implementation of Ada in distributed environments in which reliability is the primary concern were investigated. In particular, the concept that a distributed system may be programmed entirely in Ada so that the individual tasks of the system are unconcerned with which processors they are executing on, and that failures may occur in the software or underlying hardware was examined. Progress is discussed for the following areas: continued development and testing of the fault-tolerant Ada testbed; development of suggested changes to Ada so that it might more easily cope with the failure of interest; and design of new approaches to fault-tolerant software in real-time systems, and integration of these ideas into Ada.
Knight, J. C.↗
The implementation and use of ADA on distributed systems with high reliability requirements
The use and implementation of Ada in distributed environments in which reliability is the primary concern is investigated. Emphasis is placed on the possibility that a distributed system may be programmed entirely in Ada so that the individual tasks of the system are unconcerned with which processors they are executing on, and that failures may occur in the software or underlying hardware. A new linguistic construct, the colloquy, is introduced which solves the problems identified in an earlier proposal, the conversation. It was shown that the colloquy is at least as powerful as recovery blocks, but it is also as powerful as all the other language facilities proposed for other situations requiring backward error recovery: recovery blocks, deadlines, generalized exception handlers, traditional conversations, s-conversations, and exchanges. The major features that distinguish the colloquy are described. Sample programs that were written, but not executed, using the colloquy show that extensive backward error recovery can be included in these programs simply and elegantly. These ideas are being implemented in an experimental Ada test bed.
Knight, J. C.↗
Programming fault-tolerant distributed systems in Ada
Viewgraphs on the topic of programming fault-tolerant distributed systems in the Ada programming language are presented. Topics covered include project goals, Ada difficulties and solutions, testbed requirements, and virtual processors.
Voigt, Susan J.↗
A distributed system for visualizing and analyzing multivariate and multidisciplinary data
Viewgraphs on a distributed system for visualizing and analyzing multivariate and multidisciplinary data are presented. Topics covered include: program objectives; and the linked windows interactive data system (LinkWinds).
Jacobson, Allan S.↗
NASA JPL Distributed Systems Technology (DST) Object-Oriented Component Approach for Software Inter-Operability and Reuse
The purpose of this paper is to provide a description of NASA JPL Distributed Systems Technology (DST) section's object-oriented component approach to open inter-operable systems software development and software reuse.
software↗
Large Load Impacts to Distribution System Hosting Capacity
This work examined the impact of large loads on utility distribution system models using the Sandia-developed open-source software DREAMS. It was shown that hosting capacity varies with location and changes after any asset is added to, or removed from, a system. Despite the tested models having similar rated voltages and other characteristics, their thermal and voltage constrained hosting capacity varied over 2 MW. The addition of a 3-phase balanced constant power large load with power factor of 1.0 exhibited non-linear reductions to all voltage constrained hosting capacities. The reductions to thermal constrained hosting capacity from a load with similar characteristics was more linear, related to the size of the added load, and did not impact all model buses. Co-located capacitors were shown to accommodate demand that was beyond the baseline voltage constrained hosting capacity limits, however, the costs and benefits from this approach were found to not be 1:1 and required additional available thermal capacity.
24 POWER TRANSMISSION AND DISTRIBUTION↗
An analysis of the Seasat Satellite Data Distribution System
A computerized data distribution network for remote accessing of Seasat generated data is described. The service is intended as an experiment to determine user needs and operational abilities for utilizing on-line satellite generated oceanographic data. Synoptic weather observations are input to the U.S. Fleet Numerical Oceanographic Central for preparation and transfer to a PDP 11/60 central computer, from which all access trunks originate. The data available includes meteorological and sea-state information in the form of analyses and forecasts, and users are being monitored for reactions to the system design, data products, system operation, and performance evaluation. The system provides data on sea level and upper atmospheric pressure, sea surface temperature, wind magnitude and direction, significant wave heights, direction, and periods, and spectral wave data. Transmissions have a maximum rate of 1.1 kbit/sec over the telephone line.
Ferrari, A. J.↗