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  • Computer Programming and Software  (3)
  • real-time application  (1)
  • 1
    Electronic Resource
    Electronic Resource
    An Open Environment for Real-Time Applications (1999)
    Springer
    Real-time systems 16 (1999), S. 155-185 
    Details
    ISSN: 1573-1383
    Keywords: open-system ; real-time application ; two-level scheduler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper describes an open system architecture that allows independently developed hard real-time applications to run together and supports their reconfiguration at run-time. In the open system, each real-time application is executed by a server. At the lower level, the OS scheduler schedules all the servers on the EDF basis. At the upper level, the server scheduler of each server schedules the ready jobs of the application executed by the server according to the algorithm chosen for the application. The paper describes the two-level CPU scheduling scheme used by the open system and the design and implementation of a uniprocessor open system within the framework of the Windows NT operating system. The implementation consists of three key components: the two-level hierarchical kernel scheduler, common system service providers, and real-time application programming interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008094905565
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    Paper (German National Licenses)
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  • 2
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    Issues in the Imprecise Computation Approach to Fault Tolerance (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The imprecise computation technique can be used in a natural way to enhance fault tolerance. By providing a usable, approximate result whenever a failure or overload prevent the system from producing the desired, precise result, we can increase the availability of data and services, reduce the need for error-recovery operations, and minimize the costs in replication. This paper describes the domain-specific fault tolerance mechanisms that are needed to support the provision and correct usage of imprecise results for several representative application domains. The elements of an application-domain-independent architecture that can effectively integrate these domain-specific mechanisms are also described.
    Keywords: Computer Programming and Software
    Type: System Design Synthesis Technology Workshop; Sep 01, 1991; Silver Spring, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An Object-oriented Query Processor that Produces Monotonically Improving Approximate Answers (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The paper describes an object-oriented query processor that makes approximate answers available if there is not enough time to produce an exact answer or if part of the database is unavailable. The accuracy of the approximate result produces improves monotonically with the amount of data retrieved to produce the result. The query processing algorithm is based on an approximate relational data model and works within a standard relational algebra framework. The query processor maintains an object-oriented view on an underlying level and can be implemented on a relational database system with little change to the relational architecture. We show how a monotone query processing strategy can be implemented, making effective use of semantic information presented by the object-oriented view.
    Keywords: Computer Programming and Software
    Type: NASA Review of ICLASS; NASA-CR-202191|Data Engineering; Apr 01, 1991; Kobe; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    PERTS: A Prototyping Environment for Real-Time Systems (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We discuss an ongoing project to build a Prototyping Environment for Real-Time Systems, called PERTS. PERTS is a unique prototyping environment in that it has (1) tools and performance models for the analysis and evaluation of real-time prototype systems, (2) building blocks for flexible real-time programs and the support system software, (3) basic building blocks of distributed and intelligent real time applications, and (4) an execution environment. PERTS will make the recent and future theoretical advances in real-time system design and engineering readily usable to practitioners. In particular, it will provide an environment for the use and evaluation of new design approaches, for experimentation with alternative system building blocks and for the analysis and performance profiling of prototype real-time systems.
    Keywords: Computer Programming and Software
    Type: System Design Synthesis Technology Workshop; Sep 01, 1991; Silver Spring, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
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