Proceedings of the IEEE

Issue 5 • May 1987

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): c1
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  • Scanning the issue

    Publication Year: 1987, Page(s):531 - 532
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  • Distributed database design methodologies

    Publication Year: 1987, Page(s):533 - 546
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1341 KB)

    This paper surveys methodological approaches for distributed database design. The design of distribution can be performed top-down or bottom-up; the first approach is typical of a distributed database developed from scratch, while the second approach is typical of the development of a multi-database as the aggregation of existing databases. We review the design problems and methodologies along bot... View full abstract»

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  • Module replication and assignment for real-time distributed processing systems

    Publication Year: 1987, Page(s):547 - 562
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1373 KB)

    Response time is an important design criterion for real-time systems. A new analytic model is developed to estimate task response time. It considers such factors as interprocessor communication, module precedence relationship, module scheduling, interconnection network delay, and assignment of modules and files to computers. Since module assignment as well as its replication have great impact on t... View full abstract»

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  • Querying distributed databases on local area networks

    Publication Year: 1987, Page(s):563 - 572
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1018 KB)

    Distributed databases on local area networks present additional considerations for query optimization over databases on geographically distributed, point-to-point networks. This paper surveys and evaluates the state of current research on distributed query optimization for local area networks. A classification taxonomy is presented and used to analyze the proposed query-optimization algorithms. Th... View full abstract»

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  • On coupling multi-systems through data sharing

    Publication Year: 1987, Page(s):573 - 587
    Cited by:  Papers (40)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1468 KB)

    The demand for larger transaction rates and the inability of single-system-based transaction processors to keep up with demand have resulted in the growth of multi-processor-based database systems. The focus here is on coupling in a locally distributed system through multi-system data sharing in which all systems have direct access to the data. This paper addresses the following questions; i) How ... View full abstract»

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  • Heterogeneous distributed database management: The HD-DBMS

    Publication Year: 1987, Page(s):588 - 600
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1207 KB)

    The proliferation of different DBMS and advances in computer networking and communications have led to increasing heterogeneous distributed DBMS network scenarios. Major heterogeneity problems and challenges include: different database models, syntactically and semantically different DBMS, different types of controls (recovery, etc.), etc. We address herein the long-range goal for a heterogeneous ... View full abstract»

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  • Reliable distributed database management

    Publication Year: 1987, Page(s):601 - 620
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2228 KB)

    A reliable distributed database must manage dispersed and replicated data, making them available to users in spite of hardware failures. In this paper we study the algorithms and techniques that can achieve this reliability. Three scenarios are considered for reliable (i.e., nonpartitionable) networks. In the first, data are distributed but not replicated; in the second, data are replicated; and i... View full abstract»

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  • An overview of the multi-database manipulation language MDSL

    Publication Year: 1987, Page(s):621 - 632
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    With the increase in availability of databases, data needed by a user are frequently in separate autonomous databases. The logical properties of such data differ from the classical ones within a single database. In particular, they call for new functions for data manipulation. MDSL is a new data manipulation language providing such functions. Most of the MDSL functions are not available in other l... View full abstract»

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  • Some experiences with a distributed database testbed system

    Publication Year: 1987, Page(s):633 - 648
    Cited by:  Papers (5)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1394 KB)

    DDTS (Distributed Database Testbed System) was developed for the purpose of evaluating alternative approaches and algorithms for managing data stored in several databases on different machines. An overview of the system and information architectures of DDTS, as well as an example of the execution of a distributed request, are presented. The results of experiments with three query optimization algo... View full abstract»

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  • Testbed-based validation of design techniques for reliable distributed real-time systems

    Publication Year: 1987, Page(s):649 - 667
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1543 KB)

    Two tightly coupled multi-computer testbeds, one providing efficient inter-node communications tailored to the application, and the other providing more flexible full connectivity among processors and memories are used to support validation of the design techniques for distributed real-time systems. The testbeds are valuable tools for evaluating, analyzing, and studying the behavior of many algori... View full abstract»

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  • A retrospective of R*: A distributed database management system

    Publication Year: 1987, Page(s):668 - 673
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (713 KB)

    This paper discusses the experience gained during the implementation of a prototype distributed database management system. The R*prototype supports transparent distribution of a relational database which is accessed using the SQL language for data definition and manipulation. While supporting autonomy among the participating sites, R*also emphasizes good performance for both... View full abstract»

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  • An Ada-compatible distributed database management system

    Publication Year: 1987, Page(s):674 - 694
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2344 KB)

    Adaplex is an integrated language for programming database applications. It results from the embedding of the database sublanguage Daplex in the general-purpose programming language Ada [1]. This paper describes the design of DDM, a general-purpose distributed database management system implemented in Ada that supports the use of Adaplex as interface language. There are two novel aspects in the de... View full abstract»

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  • Mermaid—A front-end to distributed heterogeneous databases

    Publication Year: 1987, Page(s):695 - 708
    Cited by:  Papers (53)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1474 KB)

    Mermaid is a system that allows the user of multiple databases stored under various relational DBMSs running on different machines to manipulate the data using a common language, either ARIEL or SQL. It makes the complexity of this distributed, heterogeneous data processing transparent to the user. In this paper, we describe the architecture, system control, user interface, language and schema tra... View full abstract»

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  • The architecture of UNIX united

    Publication Year: 1987, Page(s):709 - 718
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1193 KB)

    UNIX United is an architecture for a distributed system based on UNIX. As it is compatible with UNIX at the system call level, any program written for a normal UNIX system can be transparently extended to exploit the richer environment of UNIX United. As it relies on having a UNIX system beneath it, the implementation of UNIX United, called the Newcastle Connection, provides an interesting example... View full abstract»

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  • Distributed computer systems: Four case studies

    Publication Year: 1987, Page(s):719 - 726
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (831 KB)

    Distributed computer applications built from off-the-shelf hard-ware and software are increasingly common. This paper examines four such distributed systems with contrasting degrees of decentralized hardware, control, and redundancy. The first is a one-site system, the second is a node-replicated system at a remote site for disaster backup, the third is a multi-site system with central control, an... View full abstract»

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  • Parameter estimation of continuous dynamical linear systems given discrete-time observations

    Publication Year: 1987, Page(s):727 - 729
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    We present a computationally efficient scheme for parameter estimation of continuous dynamical linear systems given discrete-time noisy observations. The proposed scheme is optimal in the sense that it converges iteratively to the exact Maximum Likelihood estimate, where each iteration increases the likelihood. View full abstract»

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  • On the application of the single-pole filter in recursive power spectrum estimation

    Publication Year: 1987, Page(s):729 - 730
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

    The Fourier transform of the autocorrelation estimates provided by applying a single-pole filter to the data-lagged product terms results in a recursive means of estimating the power spectrum. In this estimator, the number of computations required to update the spectrum estimate is independent of the number of lags employed to produce it. View full abstract»

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  • Correction to "Wave digital filters: Theory and practice"

    Publication Year: 1987, Page(s): 729
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  • Bistatic scattering from a vegetative medium simulated by cylinders

    Publication Year: 1987, Page(s):730 - 732
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB)

    By considering the vegetation as a regular homogeneous distribution of individual scatterers and thus modeling it as an array of perfectly conducting finite thin circular cylinders over a ground plane, bistatic cross section is determined using the image principle and its variation with the angle of incidence, length, and diameter is studied. View full abstract»

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  • Some important observations on fast decoupled load flow algorithm

    Publication Year: 1987, Page(s):732 - 733
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    This letter brings out clearly for the first time the relative importance and weightage of some of the assumptions made by B. Stott and O. Alsac in their fast decoupled load flow (FDLF) algorithm on its convergence property. Results have been obtained for two sample IEEE test systems. The conclusions of this work are envisaged to be of immense practical relevance while developing a fast decoupled ... View full abstract»

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  • Interactive programming environments

    Publication Year: 1987, Page(s): 734
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  • Metamagical themas: Questing for the essence of mind and patterns

    Publication Year: 1987, Page(s):734 - 735
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  • Interactive microcomputer graphics

    Publication Year: 1987, Page(s): 735
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  • Book alert

    Publication Year: 1987, Page(s): 735
    Cited by:  Papers (1)
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North Carolina State University