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IBM Journal of Research and Development

Issue 2 • Date March 1978

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Displaying Results 1 - 12 of 12
  • Novel Materials and Devices for Sunlight Concentrating Systems

    Publication Year: 1978, Page(s):112 - 121
    Cited by:  Papers (3)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (510 KB)

    Photovoltaic conversion under concentrated sunlight is a highly promising technique that could make solar-electric power generation economically competitive with fossil fuel power generation by the mid-1980s. An economic analysis has been performed which demonstrates that solar cell efficiency, concentrator efficiency, and concentrator cost are the most important parameters in a concentrating phot... View full abstract»

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  • Solar Radiative Heating in the Presence of Aerosols

    Publication Year: 1978, Page(s):122 - 133
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (649 KB)

    A theoretical study is carried out to evaluate the effects of aerosols on the shortwave flux divergence in the lower troposphere (0–2 km) by using four computational methods: Gauss-Seidel iteration, a reference method by which all orders of scattering are accounted for, and three approximations, primary scattering, no-scattering and median wavelength. By using these procedures, the radiativ... View full abstract»

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  • Computation of Convolutions and Discrete Fourier Transforms by Polynomial Transforms

    Publication Year: 1978, Page(s):134 - 144
    Cited by:  Papers (24)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (638 KB)

    Discrete transforms are introduced and are defined in a ring of polynomials. These polynomial transforms are shown to have the convolution property and can be computed in ordinary arithmetic, without multiplications. Polynomial transforms are particularly well suited for computing discrete two-dimensional convolutions with a minimum number of operations. Efficient algorithms for computing one-dime... View full abstract»

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  • Language Facilities for Programming User-Computer Dialogues

    Publication Year: 1978, Page(s):145 - 158
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (787 KB)

    Extensions to PASCAL that provide for programming man-computer dialogues are proposed. An interactive application program is viewed as a sequence of frames, representing stages of dialogue activity, and separate computational steps. First, extensions are presented to allow the description of the items of information contained in each frame. Second, PASCAL is extended to allow the inclusion of beha... View full abstract»

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  • Variational Principles for Semiconductor Device Modeling with Finite Elements

    Publication Year: 1978, Page(s):159 - 167
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (511 KB)

    Variational principles related to three areas of semiconductor device modeling by the finite element method are presented. Some subtle points which are crucial to the successful application of the method are explored. It is suggested that the validity of the selected variational formulations must be carefully ensured, and that the physics disciplines provide the best guidance for the right selecti... View full abstract»

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  • Convex Cubic Splines

    Publication Year: 1978, Page(s):168 - 178
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    Control curves used in industry are usually planar cubic splines, continuous and single-valued for a specific independent variable. If large slopes are specified at certain points, the spline coefficients, which are computed in order to preserve second derivative continuity of the spline, invariably lead to wildly oscillatory curves. Normally the large slopes occur at the ends of the curve, and th... View full abstract»

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  • Steady Axisymmetric Solutions for Pressurized Rotating Flexible Disk Packs

    Publication Year: 1978, Page(s):179 - 184
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    Steady solutions are obtained for undisturbed pressurized flexible disk packs of various configurations. Simplified fluid equations of motion are coupled with the equations governing the deflection of flexible membranes in order to arrive at the differential equations for the spacing between the disks of the pack. A simple asymptotic-solution formula is derived for computing the dependence of the ... View full abstract»

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  • Effect of Replacement Algorithms on a Paged Buffer Database System

    Publication Year: 1978, Page(s):185 - 196
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (639 KB)

    In a database system a buffer may be used to hold recently referenced pages. If this buffer is in virtual memory, the database paging system and the memory paging system affect its performance. The study of the effect of main memory replacement algorithms on the number of main memory page faults is the basic objective of this paper. We assume that the buffer replacement algorithm is least recently... View full abstract»

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  • Model for Database Reference Strings Based on Behavior of Reference Clusters

    Publication Year: 1978, Page(s):197 - 202
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (446 KB)

    The observation that references to a particular page are clustered (in time) in typical database reference strings is used as the intuitive motivation for a model of page reference activity in an interactive database system. The model leads to a two-parameter form for the (Denning) working-set functions associated with a page. Methods for estimating parameter values from measurements or from logic... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1978, Page(s):203 - 207
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    Reprints of the papers listed here may usually be obtained by writing directly to the authors. The authors' IBM divisions are identified as follows: DPD is the Data Processing Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD, General Products Division; GSD, General Systems Division; GTD, General Technology Division; OPD, Office Products Division; RES, Research Division... View full abstract»

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  • Recent IBM Patents

    Publication Year: 1978, Page(s): 208
    IEEE is not the copyright holder of this material | PDF file iconPDF (182 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1978, Page(s):209 - 210
    IEEE is not the copyright holder of this material | PDF file iconPDF (230 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