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IBM Journal of Research and Development

Issue 1 • Jan. 1963

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Displaying Results 1 - 19 of 19
  • Computer-Automated Design of Multifont Print Recognition Logic

    Publication Year: 1963, Page(s):2 - 13
    Cited by:  Papers (28)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (681 KB)

    A computer program has been written to design character recognition logic based on the processing of data samples. This program consists of two subroutines: (1) to search for logic circuits having certain constraints on hardware design, and (2) to evaluate these logics in terms of their discriminating ability over samples of the character set they are expected to recognize. An executive routine is... View full abstract»

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  • The Recognition of Handwritten Numerals by Contour Analysis

    Publication Year: 1963, Page(s):14 - 21
    Cited by:  Papers (29)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    A character recognition system has been developed for the recognition of handwritten numerals. This system uses a logically controlled cathode ray tube scanner to generate basic measurements that characterize significant features of the numeral shapes. A contour-follower procedure is used to control the scanner. In addition, special scanner subroutines initiated by feedback from the recognition lo... View full abstract»

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  • Increased Magnetic Recording Read-back Resolution by Means of a Linear Passive Network

    Publication Year: 1963, Page(s):22 - 33
    Cited by:  Papers (11)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (517 KB)

    It has been proven that the principle of superposition applies to a magnetic read-back waveform. Consequently, each pulse can be treated as an isolated transient, and a linear passive network can be used to reduce its width. In many cases this effective increase in read-back resolution would permit an increase in the operating density. The isolated read-back pulse is first approximated by a Gaussi... View full abstract»

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  • Anomalous Photoelectric Emission from Nickel

    Publication Year: 1963, Page(s):34 - 39
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (393 KB)

    The photoelectric emission from a nickel ribbon has been observed as a function of temperature from 25° to 760°C, over a wavelength range from 2250 to 2530 Å, qualitatively confirming and extending Cardwell's earlier work. The yield increases with temperature at all wavelengths, with an upward bulge near the Curie point. Fowler-Dubridge analyses of the emission from the front ... View full abstract»

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  • Synthesis of Transfer Admittance Functions Using Active Components

    Publication Year: 1963, Page(s):40 - 43
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (386 KB)

    A formal synthesis procedure is developed for active networks. The transfer admittance function is realized in parallel RC subnetworks, one of which contains a current-reversal negative impedance converter. This procedure offers several advantages over existing methods. View full abstract»

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  • Investigations of the Electro-Optical Birefringence of Polydisperse Bentonite Suspensions

    Publication Year: 1963, Page(s):44 - 57
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (619 KB)

    Colloidal suspensions of bentonite were observed to undergo a negative electro-optical birefringence at low-voltage fields even in dilute suspensions, a phenomenon not reported earlier. Experimental results do not support a previous theory that the sign of birefringence is reversed because of various particle sizes. Although interaction between particles was found to augment this low-voltage anoma... View full abstract»

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  • Threshold Relations and Diffraction Loss for Injection Lasers

    Publication Year: 1963, Page(s):58 - 61
    Cited by:  Papers (22)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    Mathematical expressions are derived for the minimum current density necessary to cause stimulated emission in injection lasers. A new type of diffraction loss for a thin light-emitting layer surrounded by light-absorbing material is calculated. View full abstract»

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  • Directionality Effects of GaAs Light-Emitting Diodes: Part I [Letter to the Editor]

    Publication Year: 1963, Page(s):62 - 63
    IEEE is not the copyright holder of this material | PDF file iconPDF (246 KB)
    Freely Available from IEEE
  • Directionality Effects of GaAs Light-Emitting Diodes: Part II [Letter to the Editor]

    Publication Year: 1963, Page(s):63 - 65
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | PDF file iconPDF (277 KB)
    Freely Available from IEEE
  • Electromagnetic Mode Population in Light-Emitting Junctions [Letter to the Editor]

    Publication Year: 1963, Page(s):66 - 67
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | PDF file iconPDF (238 KB)
    Freely Available from IEEE
  • Paramagnetic Resonance of the Shallow Acceptors Zn and Cd in GaAs [Letter to the Editor]

    Publication Year: 1963, Page(s):68 - 69
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (240 KB)
    Freely Available from IEEE
  • Determination of the Active Region in Light-Emitting GaAs Diodes [Letter to the Editor]

    Publication Year: 1963, Page(s):70 - 71
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | PDF file iconPDF (187 KB)
    Freely Available from IEEE
  • Room-Temperature Stimulated Emission [Letter to the Editor]

    Publication Year: 1963, Page(s):72 - 73
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | PDF file iconPDF (305 KB)
    Freely Available from IEEE
  • CW Operation of a GaAs Injection Laser

    Publication Year: 1963, Page(s):74 - 75
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (247 KB)

    Stimulated emission of radiation from forward-biased GaAs diodes was recently observed in several laboratories.1,2 The observations reported were made with short pulses (< 20 µsec) and a low duty cycle at 77°K. In this Letter continuous stimulated emission is reported. View full abstract»

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  • Experimental Study of Human Factors for a Handwritten Numeral Reader [Letter to the Editor]

    Publication Year: 1963, Page(s):76 - 78
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | PDF file iconPDF (255 KB)
    Freely Available from IEEE
  • IBM Technical Papers Published Recently in Other Journals

    Publication Year: 1963, Page(s):79 - 93
    IEEE is not the copyright holder of this material | PDF file iconPDF (773 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1963, Page(s):94 - 96
    IEEE is not the copyright holder of this material | PDF file iconPDF (277 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1963, Page(s):97 - 99
    IEEE is not the copyright holder of this material | PDF file iconPDF (228 KB)
    Freely Available from IEEE
  • Contents of previous three issues

    Publication Year: 1963, Page(s): 100
    IEEE is not the copyright holder of this material | PDF file iconPDF (233 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