The Experts below are selected from a list of 8751 Experts worldwide ranked by ideXlab platform
Jeffrey O. Grady - One of the best experts on this subject based on the ideXlab platform.
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Specification Development, Review, and Approval
System Requirements Analysis, 2006Co-Authors: Jeffrey O. GradyAbstract:The requirements-analysis process is driven by an identification of all of the Specifications that must be prepared on a program. The Specification Tree is the means to define and communicate this information. Figure 6.7-1 illustrates typical Specification Tree at the top level for a space transport system during the time MIL-STD-490A was effective in military procurement. It is an overlay of the system architecture, as evidenced by the architecture IDs in the lower right corner of the blocks. We could place a Specification type indicator in the lower left corner of each block. Here, the A means system Specification format, B means a hardware item Specification format, and C means a software Specification format. You might also include type N for no Specification required and P for procurement Specification. A type I could be established for interface control documents. These letters are not coordinated with the MIL-STD-490A-type letters, which are no longer used formally.
Nasa - One of the best experts on this subject based on the ideXlab platform.
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Coal gasification systems engineering and analysis. Appendix H: Work breakdown structure
2017Co-Authors: Nasa, Bdm Corp.Abstract:A work breakdown structure (WBS) is presented which encompasses the multiple facets (hardware, software, services, and other tasks) of the coal gasification program. The WBS is shown to provide the basis for the following: management and control; cost estimating; budgeting and reporting; scheduling activities; organizational structuring; Specification Tree generation; weight allocation and control; procurement and contracting activities; and serves as a tool for program evaluation.
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Preliminary design document: Ground based testbed for avionics systems
2013Co-Authors: NasaAbstract:The design and interface requirements for an avionics Ground Based Test bed (GBT) to support Heavy Lift Cargo Vehicles (HLCV) is presented. It also contains data on the vehicle subsystem configurations that are to be supported during their early, pre-PDR developmental phases. Several emerging technologies are also identified for support. A Preliminary Specification Tree is also presented.
Soo-mi Yang - One of the best experts on this subject based on the ideXlab platform.
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Privilege Management Technique for Unreliable Network Environments based on Tree Structure
2008Co-Authors: Soo-mi YangAbstract:IISO/IEC 9594-8 defines the public key framework and attribute certificate framework. Attribute certificate framework deals with privilege management infrastructure(PMI). In PMI, for privilege management using attribute certificates, role assignment certificates and role Specification certificates are used to assign and specify privileges independently. Role Specification certificates includes privilege Specifications and the details far privilege management of network environments. Privilege management of unreliable network environment tries to enhance the reliability and efficiency of privilege information transmission forwarding over unreliable routes in the presence of potentially faulty nodes and edges. Each node forms a role Specification Tree based on role Specification relationship data collected from the network. In this paper privilege management cost with the role Specification certificates Tree structure is evaluated trying to reduce the overhead incurred by role creation and modification of privileges. The multicasting of packets are used for scalability. We establish management cost model taking into account the packet loss and node reliability which continuously join and leave for network. We present quantitative results which demonstrate the effectiveness of the proposed privilege management scheme.
V. Schetinin - One of the best experts on this subject based on the ideXlab platform.
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Development and application of CATIA-GDML geometry builder
Journal of Physics: Conference Series, 2014Co-Authors: S Belogurov, Yu Berchun, A. Chernogorov, P Malzacher, E Ovcharenko, V. SchetininAbstract:Due to conceptual difference between geometry descriptions in Computer-Aided Design (CAD) systems and particle transport Monte Carlo (MC) codes direct conversion of detector geometry in either direction is not feasible. The paper presents an update on functionality and application practice of the CATIA-GDML geometry builder first introduced at CHEP2010. This set of CATIAv5 tools has been developed for building a MC optimized GEANT4/ROOT compatible geometry based on the existing CAD model. The model can be exported via Geometry Description Markup Language (GDML). The builder allows also import and visualization of GEANT4/ROOT geometries in CATIA. The structure of a GDML file, including replicated volumes, volume assemblies and variables, is mapped into a part Specification Tree. A dedicated file template, a wide range of primitives, tools for measurement and implicit calculation of parameters, different types of multiple volume instantiation, mirroring, positioning and quality check have been implemented. Several use cases are discussed.
L.g. Peck - One of the best experts on this subject based on the ideXlab platform.
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Tank waste remediation system architecture Tree
1999Co-Authors: L.g. PeckAbstract:The TWRS Architecture Tree presented in this document is a hierarchical breakdown to support the TWRS systems engineering analysis of the TWRS physical system, including facilities, hardware and software. The purpose for this systems engineering architecture Tree is to describe and communicate the system's selected and existing architecture, to provide a common structure to improve the integration of work and resulting products, and to provide a framework as a basis for TWRS Specification Tree development.