• Big Data
    Interagency Working Group
    (BD IWG)

    The Big Data Interagency Working Group (BD IWG) works to facilitate and further the goals of the White House Big Data R&D Initiative.

  • Cyber Physical Systems Interagency Working Group (CPS IWG)

    The CPS IWG is to coordinate programs, budgets, and policy recommendations for Cyber Physical Systems (CPS) research and development (R&D).

  • Cyber Security and Information Assurance Interagency Working Group (CSIA IWG)

    Cyber Security and Information Assurance (CSIA) Interagency Working Group coordinates the activities of the CSIA Program Component Area.

  • Health IT R&D
    Interagency Working Group

    The Health Information Technology Research and Development Interagency Working Group coordinates programs, budgets and policy recommendations for Health IT R&D.

  • Human Computer Interaction & Information Management Interagency Working Group (HCI&IM IWG)

    HCI&IM focuses on information interaction, integration, and management research to develop and measure the performance of new technologies.

  • High Confidence Software & Systems Interagency Working Group (HCSS IWG)

    HCSS R&D supports development of scientific foundations and enabling software and hardware technologies for the engineering, verification and validation, assurance, and certification of complex, networked, distributed computing systems and cyber-physical systems (CPS).

  • High End Computing Interagency Working Group (HEC IWG)

    The HEC IWG coordinates the activities of the High End Computing (HEC) Infrastructure and Applications (I&A) and HEC Research and Development (R&D) Program Component Areas (PCAs).

  • Large Scale Networking Interagency Working Group
    (LSN IWG)

    LSN members coordinate Federal agency networking R&D in leading-edge networking technologies, services, and enhanced performance.

  • Software Productivity, Sustainability, and Quality Interagency Working Group (SPSQ IWG)

    The purpose of the SPSQ IWG is to coordinate the R&D efforts across agencies that transform the frontiers of software science and engineering and to identify R&D areas in need of development that span the science and the technology of software creation and sustainment.

  • Video and Image Analytics
    Interagency Working Group (VIA IWG)

    Formed to ensure and maximize successful coordination and collaboration across the Federal government in the important and growing area of video and image analytics

    VIA CG
  • Wireless Spectrum Research and Development Interagency Working Group (WSRD IWG)

    The Wireless Spectrum R&D (WSRD) Interagency Working Group (IWG) has been formed to coordinate spectrum-related research and development activities across the Federal government.


File:Premkumar devanbu evolution in distributed.pdf

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Premkumar_devanbu_evolution_in_distributed.pdf(file size: 190 KB, MIME type: application/pdf)

Evolution in Distributed Heterogeneous Systems

Premkumar Devanbu and Eric Wohlstadter,

Dept. Of Computer Science,

University of California

October 31, 2001



Distributed, heterogeneous systems are becoming very common, as globalized organizations integrate applications running on different platforms, possibly written in different languages. Component-interoperability standards such as CORBA are critical enablers of this trend. Certain non-functional requirements for such features as security, quality of service, flexible administration are specially critical to distributed heterogeneous systems. Unfortunately, such requirements are often formulated late, since they depend upon a particular installation, and/or change rapidly with business and political climate. Distributed, heterogeneous systems are particularly difficult to evolve, since the elements are written in different languages, and the operational environment is heterogenous and distributed. Adding “non-functional” features late in the game is specially hard; the required modifications are scattered through the implementations of the different components. Their design and implementation is also obscured by code delocalization, as well as by complexities arising from co-ordination and synchronization considerations. We would like to address this problem with solutions that are animated by practical software engineering goals: type safety of scattered changes, and their interactions; explicit design models, with tracability to code; inter-operability with legacy components and binary COTS components; and opportunistic optimization, leveraging any available optimizations existing in the compilers that are in use.


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