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IBM Journal of Research and Development

Issue 2 • Date March 1974

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Displaying Results 1 - 12 of 12
  • Interface Imaging by Scanning Internal Photoemission

    Publication Year: 1974, Page(s):94 - 99
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (447 KB)

    A scanning internal photoemission (SIP) technique is used to obtain a high resolution map or image of the potential energy barrier at an insulator interface. The image is produced by displaying the internal photocurrent produced by a monochromatic beam of light scanned across the sample. A special technique was developed for focusing the light to a spot less than one micrometer in diameter. Photoe... View full abstract»

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  • Calculations of Stable Domain Radii Produced by Thermomagnetic Writing

    Publication Year: 1974, Page(s):100 - 109
    Cited by:  Papers (31)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (553 KB)

    Calculations are performed to determine the stable radius of a cylindrically symmetric domain nucleated in magneto-optical films during thermomagnetic writing with a laser beam. A critical bound on domain size is calculated which determines whether or not a domain of given radius, once nucleated, will be stable. The analysis shows that for a ferromagnetic material such as MnAlGe, the domain dimens... View full abstract»

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  • Accuracy of the Diffusion Approximation for Some Queuing Systems

    Publication Year: 1974, Page(s):110 - 124
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (691 KB)

    This paper presents the results of a rather extensive study of the accuracy of the diffusion approximation technique as applied to queuing models. The motive for using the diffusion process approximation here is to develop realistic analytical models of computing systems by considering service time distributions of a general form. We first review the theory of the diffusion approximation for a sin... View full abstract»

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  • Investigation into Scheduling for an Interactive Computing System

    Publication Year: 1974, Page(s):125 - 137
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (632 KB)

    This paper describes a statistical evaluation of the performance of the swap scheduling algorithm of an interactive computer system and an investigation into foreground-background scheduling to improve system performance. Input traffic, computer service time demands, and system performance were statistically analyzed. Based on the results of these analyses performance enhancements for the system w... View full abstract»

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  • Parallel Solution of Recurrence Problems

    Publication Year: 1974, Page(s):138 - 148
    Cited by:  Papers (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (622 KB)

    An mth-order recurrence problem is defined as the computation of the sequence x1, ···, xN, where xi = ƒ(ai, xi−1, ···, xi−m) and ai is some vector of parameters. This paper investigates general algorithms for solving such problems on highly parallel computers.... View full abstract»

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  • Self-directional Microwave Communication System

    Publication Year: 1974, Page(s):149 - 163
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (713 KB)

    This paper describes a communication system in which sending and receiving terminals automatically generate beams focused upon each other, which arise solely from ambient noise. The terminals are amplifying retrodirective arrays of antenna elements. Analysis and experiment are used to prove and verify the system concept. Some engineering considerations pertinent to system operation under various c... View full abstract»

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  • Image Data Compression by Predictive Coding I: Prediction Algorithms

    Publication Year: 1974, Page(s):164 - 171
    Cited by:  Papers (13)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (477 KB)

    This paper deals with predictive coding techniques for efficient transmission or storage of two-level (black and white) digital images. Part I discusses algorithms for prediction. A predictor transforms the two-dimensional dependence in the original data into a form which can be handled by coding techniques for one-dimensional data. The implementation and performance of a fixed predictor, an adapt... View full abstract»

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  • Image Data Compression by Predictive Coding II: Encoding Algorithms

    Publication Year: 1974, Page(s):172 - 179
    Cited by:  Papers (8)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (473 KB)

    This paper deals with predictive coding techniques for efficient transmission or storage of two-level (black and white) digital images. Part I discussed algorithms for prediction. Part II deals with coding techniques for encoding the prediction error pattern. First, we survey some schemes for encoding if the error pattern is assumed to be memoryless. Than a method is developed for encoding certain... View full abstract»

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  • Recent papers by IBM authors

    Publication Year: 1974, Page(s):180 - 184
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (431 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: 1974, Page(s):185 - 188
    IEEE is not the copyright holder of this material | PDF file iconPDF (391 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1974, Page(s):189 - 190
    IEEE is not the copyright holder of this material | PDF file iconPDF (379 KB)
    Freely Available from IEEE
  • Contents of previous issues

    Publication Year: 1974, Page(s):191 - 192
    IEEE is not the copyright holder of this material | PDF file iconPDF (187 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