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  • 1
    Publication Date: 1980-12-01
    Print ISSN: 0377-2217
    Electronic ISSN: 1872-6860
    Topics: Mathematics , Economics
    Published by Elsevier
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  • 2
    Publication Date: 2013-08-31
    Description: When applied to a system, the doctrine of successive refinement is a divide-and-conquer strategy. Complex systems are sucessively divided into pieces that are less complex, until they are simple enough to be conquered. This decomposition results in several structures for describing the product system and the producing system. These structures play important roles in systems engineering and project management. Many of the remaining sections in this chapter are devoted to describing some of these key structures. Structures that describe the product system include, but are not limited to, the requirements tree, system architecture and certain symbolic information such as system drawings, schematics, and data bases. The structures that describe the producing system include the project's work breakdown, schedules, cost accounts and organization.
    Keywords: ENGINEERING (GENERAL)
    Type: NASA, Washington, Readings in Systems Engineering; p 35-77
    Format: application/pdf
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  • 3
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    In:  Other Sources
    Publication Date: 2018-06-08
    Description: The Corps Battle Simulation (CBS) simulates ground and air battles between modern military.
    Format: text
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  • 4
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    In:  Other Sources
    Publication Date: 2018-06-11
    Description: No abstract available
    Keywords: Economics and Cost Analysis
    Format: text
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  • 5
    Publication Date: 2019-06-28
    Description: The Space Station Freedom Program is used to develop and implement a process for design optimization. Because the relative worth of arbitrary design concepts cannot be assessed directly, comparisons must be based on designs that provide the same performance from the point of view of station users; such designs can be compared in terms of life cycle cost. Since the technology required to produce a space station is widely dispersed, a decentralized optimization process is essential. A formulation of the optimization process is provided and the mathematical models designed to facilitate its implementation are described.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-186851 , NAS 1.26:186851 , JPL-PUBL-90-23
    Format: application/pdf
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  • 6
    Publication Date: 2019-07-12
    Description: The Athena simulation software supports an analyst from DoD or other federal agency in making stability and reconstruction projections for operational analyses in areas like Iraq or Afghanistan. It encompasses the use of all elements of national power: diplomatic, information, military, and economic (DIME), and anticipates their effects on political, military, economic, social, information, and infrastructure (PMESII) variables in real-world battle space environments. Athena is a stand-alone model that provides analysts with insights into the effectiveness of complex operations by anticipating second-, third-, and higher-order effects. For example, the first-order effect of executing a curfew may be to reduce insurgent activity, but it may also reduce consumer spending and keep workers home as second-order effects. Reduced spending and reduced labor may reduce the gross domestic product (GDP) as a third-order effect. Damage to the economy will have further consequences. The Athena approach has also been considered for application in studies related to climate change and the smart grid. It can be applied to any project where the impacts on the population and their perceptions are important, and where population perception is important to the success of the project.
    Keywords: Man/System Technology and Life Support
    Type: NPO-47857 , NASA Tech Briefs, December 2011; 12
    Format: application/pdf
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  • 7
    Publication Date: 2019-07-12
    Description: TRISA, the U.S. Army TRADOC G2 Intelligence Support Activity, received Athena 1 in 2009. They first used Athena 3 to support studies in 2011. This paper describes Athena 4, which they started using in October 2012. A final section discusses issues that are being considered for incorporation into Athena 5 and later. Athena's objective is to help skilled intelligence analysts anticipate the likely consequences of complex courses of action that use our country's entire power base, not just our military capabilities, for operations in troubled regions of the world. Measures of effectiveness emphasize who is in control and the effects of our actions on the attitudes and well-being of civilians. The planning horizon encompasses not weeks or months, but years. Athena is a scalable, laptop-based simulation with weekly resolution. Up to three months of simulated time can pass between game turns that require user interaction. Athena's geographic scope is nominally a country, but can be a region within a county. Geographic resolution is "neighborhoods", which are defined by the user and may be actual neighborhoods, provinces, or anything in between. Models encompass phenomena whose effects are expected to be relevant over a medium-term planning horizon-three months to three years. The scope and intrinsic complexity of the problem dictate a spiral development process. That is, the model is used during development and lessons learned are used to improve the model. Even more important is that while every version must consider the "big picture" at some level of detail, development priority is given to those issues that are most relevant to currently anticipated studies. For example, models of the delivery and effectiveness of information operations messaging were among the additions in Athena 4.
    Keywords: Social and Information Sciences (General)
    Type: JPL-Publ-13-9
    Format: application/pdf
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  • 8
    Publication Date: 2019-08-15
    Description: This handbook brings the fundamental concepts and techniques of systems engineering to NASA personnel in a way that recognizes the nature of NASA systems and environment. It is intended to accompany formal NASA training courses on systems engineering and project management when appropriate, and is designed to be a top-level overview. The concepts were drawn from NASA field center handbooks, NMI's/NHB's, the work of the NASA-wide Systems Engineering Working Group and the Systems Engineering Process Improvement Task team, several non-NASA textbooks and guides, and material from independent systems engineering courses taught to NASA personnel. Five core chapters cover systems engineering fundamentals, the NASA Project Cycle, management issues in systems engineering, systems analysis and modeling, and specialty engineering integration. It is not intended as a directive. Superseded by: NASA/SP-2007-6105 Rev 1 (20080008301).
    Keywords: ENGINEERING (GENERAL)
    Type: NASA-SP-6105 , NAS 1.22:6105
    Format: application/pdf
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  • 9
    Publication Date: 2019-07-12
    Description: System Design Tradeoff Model (SDTM) computer program produces information which helps to enforce consistency of design objectives throughout system. Mathematical model of set of possible designs for Space Station Freedom. Program finds particular design enabling station to provide specified amounts of resources to users at lowest total (or life-cycle) cost. Compares alternative design concepts by changing set of possible designs, while holding specified services to users constant, and then comparing costs. Finally, both costs and services varied simultaneously when comparing different designs. Written in Turbo C 2.0.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: NPO-17878 , NASA Tech Briefs (ISSN 0145-319X); 14; 12; P. 41
    Format: text
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  • 10
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    In:  Other Sources
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Man/System Technology and Life Support; Computer Programming and Software
    Type: Military Operations Research Society (MORS) Special Meeting - OR Methods in Support of Countering Transnational Threats; Dec 12, 2011 - Dec 14, 2011; McClean, VA; United States
    Format: text
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