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IBM Journal of Research and Development

Issue 6 • Nov. 1972

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Displaying Results 1 - 16 of 16
  • Theory on the Speed of Convergence in Adaptive Equalizers for Digital Communication

    Publication Year: 1972, Page(s):546 - 555
    Cited by:  Papers (92)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (617 KB)

    This paper presents an analysis of the convergence properties of adaptive transversal equalizers minimizing mean-square distortion. The intention is to reveal the influence on the speed of convergence exerted by the number of taps, the step-size parameter in the adjustment loops, and the spectrum of the unequalized signal. Attention is focused on the convergence of the expected mean-square distort... View full abstract»

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  • A New Class of Automatic Equalizers

    Publication Year: 1972, Page(s):556 - 566
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    A new class of automatic equalizers with very fast convergence is discussed in this paper. This fast convergence is accomplished by means of an iterative procedure which successively makes higher-order approximations on the desired equalizer function. The iterative procedure can be conveniently realized in the form of transversal filter stages in cascade. For a given distortion D < 1, the ... View full abstract»

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  • Computational Model of a Closed Queuing Network with Exponential Servers

    Publication Year: 1972, Page(s):567 - 572
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    A simplification and extension to Gordon and Newell's approach to closed queuing networks is derived. The equations, valid for exponential servers, with one server being a multiserver, greatly reduce the computation time required by the former approach. In addition, simplified equations for the details of the queuing network are derived. View full abstract»

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  • Exact Implicit Enumeration Method for Solving the Set Partitioning Problem

    Publication Year: 1972, Page(s):573 - 578
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    The partitioning problem may be stated as follows: Minimize ∑j=1n cjxj subject to ∑j=1n aijxj = 1, i=1, · · ·, m, where aij and xj are binary numbers. The proposed method consists in solving a new problem equivalent to the original one, the solution of th... View full abstract»

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  • Optimum Storage Allocation for Initial Loading of a File

    Publication Year: 1972, Page(s):579 - 586
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (427 KB)

    When a file is loaded into a direct access storage device using key-to-address transformations, the number and size of storage blocks can be selected. In this study, a selection that minimizes the combined cost of storage space and accesses to the storage device is determined for the case where no record additions or deletions occur after loading. View full abstract»

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  • Magnetic Bubble Memory Organization

    Publication Year: 1972, Page(s):587 - 591
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (329 KB)

    Magnetic bubbles offer promise of data storage at a lower cost than is possible using semiconductor technologies. However, a memory using magnetic bubbles is most economically implemented in the form of long shift registers, rather than as a random access storage device. This plus a lower shift rate than is possible with semiconductors suggests relatively long average access times. This shortcomin... View full abstract»

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  • Development of Water-soluble Systems for Use in Industrial Soldering Processes

    Publication Year: 1972, Page(s):592 - 597
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (387 KB)

    This communication discusses the engineering considerations involved in the design of low-polluting water-soluble systems for use in mechanized soldering processes. New formulations for water-soluble fluxes, lubricants, and solder masks are described and test data are presented. View full abstract»

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  • Charge Transfer Complex Formation of Trinitrofluorenone with Polyvinylcarbazole and Ethylcarbazole

    Publication Year: 1972, Page(s):598 - 603
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    The molar absorption constants of the charge-transfer complexes of PVCz:TNF and of ethylcarbazole:TNF and the respective equilibrium constants for the formation of these complexes in a tetrahydrofuran solution have been determined by absorption measurements. Both materials exhibit two charge-transfer absorption bands. It is shown that these two bands correspond to two transitions of only one charg... View full abstract»

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  • Multiconductor Transmission-line Theory in the TEM Approximation

    Publication Year: 1972, Page(s):604 - 611
    Cited by:  Papers (11)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (579 KB)

    Starting with Maxwell's equations, the transmission line equations are derived for a system consisting of an arbitrary number of conductors. The derivation is rigorous for long lossless conductors embedded in a uniform perfect dielectric. The presentation is essentially tutorial, most of the results being well known, at least for two- and three-conductor systems. The novelty lies in the point of v... View full abstract»

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  • Solution of the Complete Symmetric Eigenproblem in a Virtual Memory Environment

    Publication Year: 1972, Page(s):612 - 616
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (374 KB)

    Algorithms for the complete symmetric eigenproblem are studied from the viewpoint of performance in a virtual memory environment. The preferred algorithm is based on tridiagonalization and the implicit QR algorithms. Implementation factors that affect execution time are discussed. View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1972, Page(s):617 - 620
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (355 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: 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, Researc... View full abstract»

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  • Recent IBM Patents

    Publication Year: 1972, Page(s):621 - 624
    IEEE is not the copyright holder of this material | PDF file iconPDF (337 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1972, Page(s):625 - 626
    IEEE is not the copyright holder of this material | PDF file iconPDF (245 KB)
    Freely Available from IEEE
  • Author Index for Papers in Volume 16

    Publication Year: 1972, Page(s):627 - 629
    IEEE is not the copyright holder of this material | PDF file iconPDF (267 KB)
    Freely Available from IEEE
  • Subject Index for Papers in Volume 16

    Publication Year: 1972, Page(s):630 - 632
    IEEE is not the copyright holder of this material | PDF file iconPDF (273 KB)
    Freely Available from IEEE
  • Contents of previous issues in Volume 16

    Publication Year: 1972, Page(s):633 - 637
    IEEE is not the copyright holder of this material | PDF file iconPDF (296 KB)
    Freely Available from IEEE

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Clifford A. Pickover
IBM T. J. Watson Research Center