IBM Journal of Research and Development

Issue 6 • Nov. 1976

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Displaying Results 1 - 12 of 12
  • Walsh Functions for Digital Impedance Relaying of Power Lines

    Publication Year: 1976, Page(s):530 - 541
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (1051 KB)

    Impedance distance relaying for fault-protection of a plurality of high-voltage lines has not been accomplished with a minicomputer because of the burden of time placed upon these computers. A new method for computing impedance from data samples is proposed, which would employ only the computer operations of Add, Subtract, and Shift. This is valuable because these operations are one to two orders ... View full abstract»

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  • Buffer Overflow in a Store-and-Forward Network Node

    Publication Year: 1976, Page(s):542 - 550
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (593 KB)

    Equilibrium behavior of a store-and-forward network node with finite buffer capacity is studied via a network-of-queues model. The positive acknowledgment protocol is explicitly modeled and consumes part of the buffer pool. The principal results are the buffer overflow probability, the mean delays, and the distribution of queue lengths as functions of the buffer capacity and traffic levels. View full abstract»

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  • Scheduling as a Graph Transformation

    Publication Year: 1976, Page(s):551 - 559
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (482 KB)

    The scheduling of a set of tasks, with precedence constraints and known execution times, into a set of identical processors is considered. Optimal scheduling of these tasks implies utilizing a minimum number of processors to satisfy a deadline, or finishing in minimal time using a fixed number of processors. This process can be seen as a transformation of the original graph into another graph, who... View full abstract»

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  • SEQUEL 2: A Unified Approach to Data Definition, Manipulation, and Control

    Publication Year: 1976, Page(s):560 - 575
    Cited by:  Papers (60)  |  Patents (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (669 KB)

    Sequel 2 is a relational data language that provides a consistent, English keyword-oriented set of facilities for query, data definition, data manipulation, and data control. Sequel 2 may be used either as a stand-alone interface for nonspecialists in data processing or as a data sublanguage embedded in a host programming language for use by application programmers and data base administrators. Th... View full abstract»

    Freely Available from IEEE
  • Data Organization in Magnetic Bubble Lattice Files

    Publication Year: 1976, Page(s):576 - 581
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (382 KB)

    In this paper, we discuss several aspects of data organization in the framework of a recently developed magnetic bubble memory technology known as a bubble lattice file. A dynamic ordering scheme, different from those implemented in conventional T-I bar bubble memories, is proposed. This ordering is particularly suited for bubble lattices. Some performance figures are included for comparison. View full abstract»

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  • Procedural Representation of Three-dimensional Objects

    Publication Year: 1976, Page(s):582 - 589
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (470 KB)

    A system of PL/I procedures has been written that permits geometric objects to be described hierarchically. The objects are themselves represented as PL/I procedures, allowing very general use of variables. By effectively intercepting subprogram calls, the system provides a means of modifying the semantics associated with any object without modifying the object's procedural description. View full abstract»

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  • Determining the Three-dimensional Convex Hull of a Polyhedron

    Publication Year: 1976, Page(s):590 - 601
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (526 KB)

    A method is presented for determining the three-dimensional convex hull of a real object that is approximated in computer storage by a polyhedron. Essentially, this technique tests all point pairs of the polyhedron for convex edges of the convex hull and then assembles the edges into the polygonal boundaries of each of the faces of the convex hull. Various techniques for optimizing this process ar... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1976, Page(s):602 - 607
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (436 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; OPD, Ofice Products Division; RES, Research Division; SCD, System Communications Divisi... View full abstract»

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  • Recent IBM patents

    Publication Year: 1976, Page(s):608 - 609
    IEEE is not the copyright holder of this material | |PDF file iconPDF (203 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1976, Page(s):610 - 612
    IEEE is not the copyright holder of this material | |PDF file iconPDF (262 KB)
    Freely Available from IEEE
  • Author Index for Papers in Volume 20

    Publication Year: 1976, Page(s):613 - 614
    IEEE is not the copyright holder of this material | |PDF file iconPDF (276 KB)
    Freely Available from IEEE
  • Subject Index for Papers in Volume 20

    Publication Year: 1976, Page(s):615 - 616
    IEEE is not the copyright holder of this material | |PDF file iconPDF (214 KB)
    Freely Available from IEEE

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Rachel D'Annucci Henriquez
IBM T. J. Watson Research Center