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IBM Systems Journal

Issue 3 • Date 1967

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Displaying Results 1 - 6 of 6
  • Evaluation of redundancy in a parallel algorithm

    Page(s): 142 - 149
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1313 KB)  

    Computing systems capable of simultaneously executing a number of tasks may become more important in the future.1 This paper considers an implication of this trend in the field of numerical analysis. We aim to give an informal description of one means whereby parallelism can be produced and exploited. A particular technique for the development of additional parallelism in conventional sequential algorithms (the introduction of redundancy) is illustrated by a discussion of the bisection technique for determining the roots of functions. View full abstract»

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  • Aspects of the Gemini real-time operating system

    Page(s): 150 - 162
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1597 KB)  

    Three generations of programming systems have provided realtime ground support for manned spaceflight programs. The first of these was the Mercury system, which became operational in 1960.1 The third and current system supports the Apollo program. The subject of this paper is the second in the series, the Gemini system, developed for NASA at the Manned Spaceflight Center in Houston, Texas. View full abstract»

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  • High-speed calculation of the critical paths of large networks

    Page(s): 163 - 191
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2087 KB)  

    During an investigation of several project network techniques for their applicability to the effective description of business problems, it became evident that more efficient computer programs than those currently available could be written for large networks. Heretofore, critical-path computations have been divided into several phases. The experimental program described here employs a one-phase calculation procedure that eliminates much of the preprocessing of input data required by other methods and therefore achieves faster calculation speed. Written for the IBM 7090, the program calculates the critical path as well as early and late start times for large project networks without requiring the storage of intermediate results on magnetic tape. A formal descriptive language is used to describe the basic algorithm, first at a functional level and then at a machine-dependent level. View full abstract»

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  • An automatic dictionary and the verification of machine-readable text

    Page(s): 192 - 207
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1845 KB)  

    As part of a broader study dealing with the conversion of documents into machine-readable form, a procedure for machine-assisted proofreading was developed and investigated. The proofreading function was assumed to include correction of spelling errors and standardization of spelling variants. The purpose here is to describe the general procedure, which was based on an experimental dictionary and various classification and processing algorithms, and to comment on the results of the investigation. A complete description of the larger study and its results appears in a final report. View full abstract»

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  • Authors

    Page(s): 208
    Save to Project icon | PDF file iconPDF (882 KB)  
    Freely Available from IEEE
  • Abstracts from recent papers by IBM authors

    Page(s): 209 - 219
    Save to Project icon | PDF file iconPDF (1632 KB)  
    Freely Available from IEEE

Aims & Scope

Throughout its history, the IBM Systems Journal has been devoted to software, software systems, and services, focusing on concepts, architectures, and the uses of software.

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Editor-in-Chief
John J. Ritsko
IBM T. J. Watson Research Center5