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IBM Journal of Research and Development

Issue 2 • Date Apr. 1958

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Displaying Results 1 - 14 of 14
  • Table of Contents

    Publication Year: 1958, Page(s): 89
    IEEE is not the copyright holder of this material | PDF file iconPDF (184 KB)
    Freely Available from IEEE
  • High-Resolution Magnetic Recording Structures

    Publication Year: 1958, Page(s):90 - 104
    Cited by:  Papers (8)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (732 KB)

    Design concepts are established for several high-resolution magnetic recording structures, and their application demonstrated. The conventional ring head is treated and two new devices are described. A probe-type unit is discussed which shows promise in high-density vertical magnetic recording. A wire-grid array is also advanced to outline a unique conceptual approach to the achievement of higher ... View full abstract»

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  • Programs as a Tool for Research in Systems Organization

    Publication Year: 1958, Page(s):105 - 122
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (977 KB)

    A program for the solution of a problem by a data-processing system constitutes a conceptual link between the problem and the machine. It is proposed that both problems and machine organization be studied in terms of programs. A data-processing system may for this purpose be considered a collection of units such as arithmetic units and stores of different types and characteristics. A standard repr... View full abstract»

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  • On the Statistical Mechanics of Impurity Conduction in Semiconductors

    Publication Year: 1958, Page(s):123 - 129
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (389 KB)

    The statistical mechanics of the impurity electron states for a semiconductor with a low density of donors, and a small amount of acceptor compensation, is analyzed. Expressions are obtained for the number of dissociated donor ion states according to the Mott model, and for the effects of multiple trapping, and of dispersion of the trapping energies, on this number. An expression for the thermoele... View full abstract»

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  • Pulse Time Displacement in High-Density Magnetic Tape

    Publication Year: 1958, Page(s):130 - 141
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (527 KB)

    In computer magnetic tape systems, a primary factor in character rate is recording density. Pulse time displacement places a direct limit on the maximum bit density which may be used in parallel NRZI recording systems in which recovery of the information on readback depends on correct synchronism of all tracks. Measurement techniques for evaluation and analysis of pulse time displacement are descr... View full abstract»

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  • Reliability Improvement by the Use of Multiple-Element Switching Circuits

    Publication Year: 1958, Page(s):142 - 147
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (369 KB)

    Physical devices used for switching have finite probabilities of failure. Circuits which make use of redundancy to achieve resultant reliabilities greater than that of their elements have been proposed and have been analyzed for the case of intermittent failures. The present paper extends certain of these results to the case of permanent failures of the elements, assuming that the reliability of t... View full abstract»

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  • Reliability Improvement through Redundancy at Various System Levels

    Publication Year: 1958, Page(s):148 - 158
    Cited by:  Papers (24)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    Improvement in computing machine reliability through redundancy is studied as a function of the level at which the redundancy is applied. The reliability achieved by redundancy of complete, independent machines is compared to that achieved by redundancy of smaller units. View full abstract»

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  • The Automatic Creation of Literature Abstracts

    Publication Year: 1958, Page(s):159 - 165
    Cited by:  Papers (145)  |  Patents (31)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (449 KB)

    Excerpts of technical papers and magazine articles that serve the purposes of conventional abstracts have been created entirely by automatic means. In the exploratory research described, the complete text of an article in machine-readable form is scanned by an IBM 704 data-processing machine and analyzed in accordance with a standard program. Statistical information derived from word frequency and... View full abstract»

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  • On Checking an Adder

    Publication Year: 1958, Page(s):166 - 168
    Cited by:  Papers (47)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (277 KB)

    It is widely known that a computer adder can be checked by a completely independent circuit using check symbols that are residues of the numbers modulo some base. This paper describes such a residue checking system and shows, moreover, that independent adding and checking circuits are possible only with systems of this type. The discussion includes a method of handling residue-class check symbols ... View full abstract»

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  • A Note on the Computation of Eigenvalues and Vectors of Hermitean Matrices

    Publication Year: 1958, Page(s):169 - 170
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    The matrix eigenvalue problem, so important in physics, chemistry and engineering, is straightforward in principle. In practice, considerations of numerical accuracy and speed put a severe restriction on the class and size of solvable matrices. Modern digital computers necessarily play a vital role in the solution for large matrices. View full abstract»

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  • IBM Technical Papers Published in Other Journals

    Publication Year: 1958, Page(s):171 - 172
    IEEE is not the copyright holder of this material | PDF file iconPDF (240 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1958, Page(s): 173
    IEEE is not the copyright holder of this material | PDF file iconPDF (149 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1958, Page(s):174 - 175
    IEEE is not the copyright holder of this material | PDF file iconPDF (175 KB)
    Freely Available from IEEE
  • Contents of Previous Four Issues

    Publication Year: 1958, Page(s): 276
    IEEE is not the copyright holder of this material | PDF file iconPDF (182 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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Meet Our Editors

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