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IBM Journal of Research and Development

Issue 3 • Date May 1974

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Displaying Results 1 - 13 of 13
  • On Optimization of Storage Hierarchies

    Publication Year: 1974, Page(s):194 - 203
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (523 KB)

    A simple model of the storage hierarchies is formulated with the assumptions that the effect of the storage management strategy is characterized by the hit ratio function. The hit ratio function and the device technology-cost function are assumed to be representable by power functions (or piece-wise power functions). The optimization of this model is a geometric programming problem. An explicit fo... View full abstract»

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  • Loss of Point-to-Point Traffic in Three-Stage Circuit Switches

    Publication Year: 1974, Page(s):204 - 216
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    A theoretical study is made of simple analytical models for the point-to-point loss of telecommunication traffic caused by blocking in three-stage circuit switches. Two new models are compared with Jacobaeus' frequently used model and with some simulation results to determine regions of acceptable accuracy. The effects of random hunting and sequential hunting for routes are compared by simulation.... View full abstract»

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  • Efficient Algorithm for the Partitioning of Trees

    Publication Year: 1974, Page(s):217 - 224
    Cited by:  Papers (7)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (459 KB)

    This paper describes an algorithm for partitioning a graph that is in the form of a tree. The algorithm has a growth in computation time and storage requirements that is directly proportional to the number of nodes in the tree. Several applications of the algorithm are briefly described. In particular it is shown that the tree partitioning problem frequently arises in the allocation of computer in... View full abstract»

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  • Photolithography in Integrated Circuit Mask Metrology

    Publication Year: 1974, Page(s):225 - 231
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (467 KB)

    Photoresist technology is shown to have important advantages over the use of high-resolution silver halide films in dimensional metrology for integrated circuit masks. Experimental techniques are shown for the use of photoresist and chrome images in the study of image quality and uniformity and in analysis of the causes of image degradation. This method is applied to in situ lens evaluation and to... View full abstract»

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  • Analysis of an AC Gas Display Panel

    Publication Year: 1974, Page(s):232 - 243
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (531 KB)

    The details and results for a one-dimensional numerical analysis of the gaseous discharge occurring at a single intersection of an ac gas panel are reported. A particular object of the program is the determination of the electric field magnitude as a function of both position and time, taking into account the field distortion due to the space charge. The calculations are based on the Townsend aval... View full abstract»

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  • Simulation of Cyclic Operation of a Gas Panel Device

    Publication Year: 1974, Page(s):244 - 249
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (401 KB)

    This paper presents a numerical simulation model for the operation of a gas panel discharge cell with a neon-argon mixture. The model is based on a Townsend avalanche or direct ionization mechanism and secondary emission, as well as Penning collisions or indirect ionization. Charges on the dielectric walls are included, but space-charge field distortion is neglected. Cyclic operation of the cell i... View full abstract»

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  • On Proving Correctness of Microprograms

    Publication Year: 1974, Page(s):250 - 266
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (729 KB)

    This paper describes the results of an investigation in proving the correctness of microprograms. The vehicle used is the S-machine, which is a very simple “paper” computer. The approach to the proof of correctness is based on formally defining the machine-instruction level and the microprogramming level of the given machine, and then showing that these “interfaces” are... View full abstract»

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  • Channel Equalization Using a Kalman Filter for Fast Data Transmission

    Publication Year: 1974, Page(s):267 - 273
    Cited by:  Papers (123)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (454 KB)

    This paper shows how a Kalman filter may be applied to the problem of setting the tap gains of transversal equalizers to minimize mean-square distortion. In the presence of noise and without prior knowledge about the channel, the filter algorithm leads to faster convergence than other methods, its speed of convergence depending only on the number of taps. Theoretical results are given and computer... View full abstract»

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  • Stress Analysis of Glass-Bonded Ferrite Recording Heads

    Publication Year: 1974, Page(s):274 - 278
    Cited by:  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (346 KB)

    Glass-bonded ferrite recording heads are subject to appreciable thermal stress because of the difference in thermal expansion between glass and ferrite in the temperature range of the glassing cycle. A theoretical analysis reveals the complexity of stress distributions in the structure and pinpoints the critically stressed areas in which a potential fracture or a magnetic degradation of the materi... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1974, Page(s):279 - 282
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 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, Office Products Division; RES, Resear... View full abstract»

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  • Recent IBM patents

    Publication Year: 1974, Page(s):283 - 285
    IEEE is not the copyright holder of this material | PDF file iconPDF (321 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1974, Page(s):286 - 287
    IEEE is not the copyright holder of this material | PDF file iconPDF (240 KB)
    Freely Available from IEEE
  • Contents of previous issues

    Publication Year: 1974, Page(s):288 - 289
    IEEE is not the copyright holder of this material | PDF file iconPDF (226 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