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IBM Journal of Research and Development

Issue 1 • Jan. 1959

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Displaying Results 1 - 14 of 14
  • Automatic Failure Recovery in a Digital Data Processing System

    Publication Year: 1959, Page(s):2 - 12
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (610 KB)

    This paper describes a program which will enable a complex digital data processing system to give “first aid” to itself. Ordinarily, when an error occurs during system operations, the computer must be stopped for corrective maintenance. The FIX program, however, automatically compensates for computer malfunctions so that recovery from errors may be effected with a negligible loss of ... View full abstract»

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  • Diffusion Attenuation, Part I

    Publication Year: 1959, Page(s):13 - 17
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (382 KB)

    Perturbation methods are applied to the problem of calculating the attenuation of signals consisting of compensated space charges moving in an electric field of general, but prescribed, form. Asymptotic formulas for attenuation and phase shift are derived which apply when the diffusion currents giving rise to attenuation are small compared to the field-induced currents. Alternate expansions of the... View full abstract»

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  • Diffusion Attenuation, Part II

    Publication Year: 1959, Page(s):18 - 24
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (586 KB)

    The amount of diffusion attenuation has been computed as a function of frequency for the case of uniform electric field. Application to drift transistors is discussed. View full abstract»

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  • On the Mathematical Theory of Error-Correcting Codes

    Publication Year: 1959, Page(s):25 - 34
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (587 KB)

    Hamming considered the problem of efficient, faultless transmission of binary data over a noisy channel. For a channel which corrupts no more than one binary digit in each sequence of length n, he constructed alphabets, the so-called Hamming codes, which permit error-free signalling. The authors study the analogous problem for channels which can corrupt a greater number of digits. Non-binary chann... View full abstract»

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  • The Thermal Equivalent Circuit of a Transistor

    Publication Year: 1959, Page(s):35 - 45
    Cited by:  Papers (30)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (628 KB)

    An exact electrical analogue is given for the thermal system between the collector junction and the constant-temperature environment of a transistor. For this circuit analogue, the voltage response to an applied current is equivalent to the temperature response of the collector junction to an applied-power dissipation. The objective of this paper is (1) to prove that this thermal equivalent circui... View full abstract»

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  • The Multipurpose Bias Device—Part II: The Efficiency of Logical Elements

    Publication Year: 1959, Page(s):46 - 53
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (478 KB)

    The efficiency of a logical element can be equated with the set of subfunctions it realizes upon biasing or duplication of inputs. Various classes of elements are considered, and optimum or near-optimum examples are presented. Some related areas of study are suggested. View full abstract»

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  • An Analysis of Adequate Inventory Levels

    Publication Year: 1959, Page(s):54 - 57
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (363 KB)

    An analytical procedure for determining adequate stock levels for an inventory system with random demand and replenishment functions is presented. View full abstract»

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  • Two-Parameter Lifetime Distributions for Reliability Studies of Renewal Processes

    Publication Year: 1959, Page(s):58 - 73
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (822 KB)

    Probability functions are defined for use in reliability studies of equipments which are maintained over a long period of time through replacement of components. These are: lifetime distribution function, lifetime density function, probability of survival, hazard, expected number of replacements, and renewal rate. Theoretical results of renewal theory are adapted to reliability studies of complex ... View full abstract»

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  • An Experimental Modulation-Demodulation Scheme for High-Speed Data Transmission

    Publication Year: 1959, Page(s):74 - 84
    Cited by:  Papers (4)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (559 KB)

    An experimental low-cost system was designed to determine speed and reliability limitations on transmitting binary data over private telephone lines. A brief review of alternative approaches is given, with a description of the laboratory model. Performance of the equipment is reported with the reliabilities experienced at 600, 1000, 1600, and 2400 bits per second. View full abstract»

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  • Application of Phase-Contrast Metallography in a Production Laboratory

    Publication Year: 1959, Page(s):85 - 92
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (839 KB)

    Metallographic examination is an important tool for the control of heat treating of metals and alloys. The primary function of heat treating is to change some properties of metals and alloys favorably by altering the crystal and grain structures. Precise determination of the internal structure is an important guide for the control of the various treatments. View full abstract»

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  • Observations of Rotational Switching in Ferrites

    Publication Year: 1959, Page(s):93 - 95
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    Three mechanisms of flux reversal are proposed for the flux reversal in square-loop ferrites, each mechanism being dominant over a certain region of the switching curve. A coherent rotational model is proposed, and experimental evidence supporting the mode yields the lowest values of switching constants for ferrites reported to date. Details of this work, including studies of several ferrites and ... View full abstract»

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  • IBM Technical Papers Published in Other Journals

    Publication Year: 1959, Page(s):96 - 100
    IEEE is not the copyright holder of this material | PDF file iconPDF (401 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1959, Page(s):101 - 102
    IEEE is not the copyright holder of this material | PDF file iconPDF (230 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1959, Page(s):103 - 104
    IEEE is not the copyright holder of this material | PDF file iconPDF (239 KB)
    Freely Available from IEEE

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