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IBM Journal of Research and Development

Issue 2 • Date April 1963

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Displaying Results 1 - 16 of 16
  • Some New Classes of Cyclic Codes Used for Burst-Error Correction

    Publication Year: 1963, Page(s):102 - 111
    Cited by:  Papers (6)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (577 KB)

    A general theory of cyclic codes correcting a set of given types of errors is presented. Codes published by Abramson, Fire, Melas and others are accounted for in this theory, which also offers several new classes of codes. These new codes are competitive with existing ones. In burst-error correction, for certain message lengths they may be better since they may need fewer parity check bits. View full abstract»

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  • The Lightly Loaded Foil Bearing at Zero Angle of Wrap

    Publication Year: 1963, Page(s):112 - 116
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (377 KB)

    A method is developed for determining, to the first order, the deflection from a straight path of a perfectly flexible tape moving near a rigid cylinder. The case of a parabolic cylinder is considered. View full abstract»

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  • Propagation of Torsional Disturbances in a Homogeneous Elastic Sphere

    Publication Year: 1963, Page(s):117 - 120
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (333 KB)

    Localized torsional stress is applied on the surface of a homogeneous elastic sphere for a short duration of time. The propagation of the disturbance caused by this stress is calculated numerically by superposing the normal mode solutions. The phases of the body waves and surface waves are obtained. View full abstract»

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  • A Method for Key-to-Address Transformation

    Publication Year: 1963, Page(s):121 - 126
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (399 KB)

    Techniques used in the theory of error-correcting codes are applied to solve the problem of addressing a large file. This novel approach to the file addressing problem is illustrated with a specific design to show feasibility. Its effectiveness is further illustrated by comparing test results obtained from a simulated calculation, which used typical data, against values calculated from an ideal mo... View full abstract»

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  • An Application of Coding Theory to a File Address Problem

    Publication Year: 1963, Page(s):127 - 129
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (233 KB)

    In this paper a file address problem is proved to be equivalent to a problem in coding theory. Results in coding theory can thus be used in solving this file addressing problem. It is shown, in particular, how the theory of Bose-Chaudhuri codes can be applied. A simple transformation from the input information to its address is given. This method can be easily implemented using either a computer o... View full abstract»

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  • Magnetization of Uniaxial Cylindrical Thin Films

    Publication Year: 1963, Page(s):130 - 134
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (306 KB)

    An analysis is given of the magnetization of a cylindrical thin film exhibiting a uniaxial anisotropy in the circumferential direction. The magnetization and demagnetizing fields are derived for the cylinder where the magnetization is not uniform. The derivation is accomplished by dividing up the cylinder into a large number of uniformly magnetized, coaxial cylindrical regions in superposition and... View full abstract»

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  • A Liquid Scintillation Counter Using Anticoincidence Shielding

    Publication Year: 1963, Page(s):135 - 145
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (544 KB)

    A liquid scintillation counter with an active volume of one liter is described. The plastic anticoincidence shield reduces background by about 25 percent in the H3 and C14 region. Photomultiplier noise is effectively eliminated by nanosecond coincidence circuitry. The tunnel diodes used in the coincidence arrangement also act as baseline or window discriminators. Counting eff... View full abstract»

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  • Fly's-Eye Lens Technique for Generating Semiconductor Device Fabrication Masks

    Publication Year: 1963, Page(s):146 - 150
    Cited by:  Papers (3)  |  Patents (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (455 KB)

    This Communication describes an improved method for fabricating multiple-image photographic masks of high quality. Photographic masks are commonly used in the fabrication of silicon transistors and diodes. Such masks are needed in sets of five, ten, or even twenty, each being used for one of the steps in the photoengraving-type fabrication process. Arrays of many devices are made at one time on a ... View full abstract»

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  • A Note on Extending Certain Codes to Correct Error Bursts in Longer Messages

    Publication Year: 1963, Page(s):151 - 152
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    Given a burst-correcting code for short messages, it would seem practical and would be desirable to derive efficient codes for correcting the same types of bursts in longer messages. This note presents a simple method of constructing such codes, and supplies a geometric interpretation of the method. The Fire burst correcting codes1 are a special case of the class of codes presented here... View full abstract»

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  • Nominal Clearance of the Foil Bearing

    Publication Year: 1963, Page(s):153 - 154
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    Classic lubrication theory has generally been directed toward fluid films bounded by solid objects that were assumed to be infinitely rigid. This assumption, however, is contrary to the physical nature of things. Blok and van Rossum1 introduced the concept that the rigid bearing could be replaced with a perfectly flexible band. This configuration has been termed the foil bearing. It rep... View full abstract»

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  • Line Widths and Pressure Shifts in Mode Structure of Stimulated Emission from GaAs Junctions

    Publication Year: 1963, Page(s):155 - 156
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (265 KB)

    Stimulated emission from forward biased p-n GaAs junctions has been reported by several laboratories.1,2 Most of the reported spectroscopic measurements have been made under medium resolution. This Communication reports high-resolution measurements of the line width as well as the dependence of the GaAs stimulated emission characteristics on hydrostatic pressure. View full abstract»

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  • Threshold Current for p-n Junction Lasers [Letter to the Editor]

    Publication Year: 1963, Page(s):157 - 159
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (316 KB)
    Freely Available from IEEE
  • On the Direct Observation of the Substructure Network in Iron [Letter to the Editor]

    Publication Year: 1963, Page(s):160 - 162
    IEEE is not the copyright holder of this material | PDF file iconPDF (327 KB)
    Freely Available from IEEE
  • IBM Technical Papers Published Recently in Other Journals

    Publication Year: 1963, Page(s):163 - 174
    IEEE is not the copyright holder of this material | PDF file iconPDF (752 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1963, Page(s):175 - 177
    IEEE is not the copyright holder of this material | PDF file iconPDF (221 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1963, Page(s):178 - 180
    IEEE is not the copyright holder of this material | PDF file iconPDF (233 KB)
    Freely Available from IEEE

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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