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IBM Journal of Research and Development

Issue 5 • Date Sept. 1973

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Displaying Results 1 - 13 of 13
  • Decomposition of a Data Base and the Theory of Boolean Switching Functions

    Publication Year: 1973, Page(s):374 - 386
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    The notion of a functional relation among the attributes of a data set can be fruitfully applied in the structuring of an information system. These relations are meaningful both to the user of the system in his semantic understanding of the data, and to the designer in implementing the system. An important equivalence between operations with functional relations and operations with analogous Boole... View full abstract»

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  • Characterization of Program Paging in a Time-sharing Environment

    Publication Year: 1973, Page(s):387 - 393
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (489 KB)

    This paper describes a method for predicting the paging behavior of a program in a virtual memory multiprogramming environment. The effect of overall system activity on the program is summarized in one parameter, the page survival index. The model correlates well with observations taken on programs running under CP-67. The model can be used for paging load prediction, simulator input verification,... View full abstract»

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  • Response Time Characterization of an Information Retrieval System

    Publication Year: 1973, Page(s):394 - 403
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (565 KB)

    A methodology for computer performance evaluation based on the statistical characterization of response time is described. The results of its application to an information retrieval system are presented. The first part of the paper gives a general discussion of measurement techniques, data reduction procedures and the structure of the system being examined. A set of “system environment ... View full abstract»

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  • An Analysis of Page Allocation Strategies for Multiprogramming Systems with Virtual Memory

    Publication Year: 1973, Page(s):404 - 412
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    In a multiprogramming, virtual-memory computing system, many processes compete for the main storage page frames and CPU's of the real system. It is customary to define a subset of these processes called the “multiprogramming set” (MPS), and to allocate resources only to those processes currently in the MPS. Each process remains in the MPS for a limited time and is then demoted. The s... View full abstract»

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  • A Decision-feedback Receiver for Channels with Strong Intersymbol Interference

    Publication Year: 1973, Page(s):413 - 419
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (413 KB)

    This paper deals with the problem of equalizing channels containing strong intersymbol interference. Typical of such channels are those of digital magnetic recording systems and data communication systems with partial-response signaling. First we discuss reasons that a conventional receiver with a linear equalizer cannot efficiently compensate for distortion in such channels. We then present a new... View full abstract»

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  • Lower Bounds for the Partitioning of Graphs

    Publication Year: 1973, Page(s):420 - 425
    Cited by:  Papers (76)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (385 KB)

    Let a k-partition of a graph be a division of the vertices into k disjoint subsets containing m1 ≥ m2, …, ≥ mk vertices. Let Ec be the number of edges whose two vertices belong to different subsets. Let λ1 ≥ λ2, …, ≥ λk be the k largest eigenvalues of a matrix... View full abstract»

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  • Dislocations in Gadolinium Gallium Garnet (Gd3Ga5O12): III. Nature of Prismatic Loops and Helical Dislocations

    Publication Year: 1973, Page(s):426 - 429
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (309 KB)

    Thin garnet films suitable for magnetic bubble devices can be made by depositing the film material onto nonmagnetic garnets such as Gd3Ga5O12 (GGG). The performance of these devices is influenced by the dislocation content of the films. This, in turn, depends on the dislocation content of the substrate. Dislocations in the substrate can be detected by means of the ... View full abstract»

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  • Design and Characteristics of n-Channel Insulated-gate Field-effect Transistors

    Publication Year: 1973, Page(s):430 - 442
    Cited by:  Papers (12)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (650 KB)

    An n-channel insulated-gate field-effect transistor technology established at IBM Research has served as the basis for further development leading to FET memory. Designs and characteristics of experimental devices of 500 and 1000 Å gate insulator thicknesses are presented, with particular attention to the effects of source-drain spacing. View full abstract»

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  • Theory and Operation of Space-charge-limited Transistors with Transverse Injection

    Publication Year: 1973, Page(s):443 - 458
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (798 KB)

    The development of a new device, called the space-charge-limited (SCL) transistor with transverse injection is reported in this paper. A theoretical model for space-charge-limited transistors, both npn and pnp, on high-resistivity silicon substrates is described and a quantitative analysis is given. Experimental results for SCL transistors are presented to support the model's validity. According t... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1973, Page(s):459 - 462
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (405 KB)

    Reprints of the papers listed here can usually be obtained by writing directly to the authors. The authors' IBM divisions are identified as follows: ASDD is the Advanced Systems Development Division; DPD, Data Processing Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD General Products Division; GSD, General Systems Division; OPD, Ofice Products Division; RES, Research... View full abstract»

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  • Recent IBM patents

    Publication Year: 1973, Page(s):463 - 465
    IEEE is not the copyright holder of this material | PDF file iconPDF (326 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1973, Page(s):466 - 468
    IEEE is not the copyright holder of this material | PDF file iconPDF (308 KB)
    Freely Available from IEEE
  • Contents of previous issues

    Publication Year: 1973, Page(s):469 - 471
    IEEE is not the copyright holder of this material | PDF file iconPDF (252 KB)
    Freely Available from IEEE

Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center