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IBM Journal of Research and Development

Issue 6 • Date Nov. 1997

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Displaying Results 1 - 12 of 12
  • An overview of impact printing

    Publication Year: 1997, Page(s):651 - 668
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2031 KB)

    This paper gives an overview of impact printing and reviews some of the more recent advances made in this printing technology. Matrix and fully-formed-character impact-printing technologies are discussed for both serial printers and line printers. The critical electromechanical subassemblies that are described are the hammer unit, the paper-handling system, the inking system, and the type-element ... View full abstract»

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  • Print-quality enhancement in electrophotographic printers

    Publication Year: 1997, Page(s):669 - 678
    Cited by:  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1109 KB)

    Print-quality enhancement (PQE) is a sophisticated form of image enhancement that is used to improve print quality. The benefits of PQE include reduced edge raggedness, control over boldness, stroke-imbalance correction, and improvements to the appearance of patterns that are difficult to print. Use of PQE permits one to obtain high-quality printing while using printers with lower resolution than ... View full abstract»

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  • Use of the transform exit sequence in printing and as a framework for the solution of complex problems

    Publication Year: 1997, Page(s):679 - 692
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1398 KB)

    This paper is both a review of previous research and development and a description of new work for the IBM PSF/2 and PSF/6000™ printing products. These products are best characterized as complex queue drivers, originally designed to allow fast printers to be driven directly from the existing print subsystems of OS/2® and AIX®, respectively. The new work extends the capability ... View full abstract»

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  • Design of component-supply contract with commitment-revision flexibility

    Publication Year: 1997, Page(s):693 - 703
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (936 KB)

    In this paper, we study a type of supply contract that is frequently used in the electronics industry. A common feature of these supply contracts is that at the beginning of the contract, the buyer makes purchasing commitments to the supplier for each period. The buyer may have some flexibility to purchase quantities that actually deviate from the original commitments. Moreover, as time passes and... View full abstract»

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  • A two-step computation of cyclic redundancy code CRC-32 for ATM networks

    Publication Year: 1997, Page(s):705 - 709
    Cited by:  Papers (20)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (529 KB)

    In the field of telecommunications, among the numerous cyclic redundancy codes in use, ATM CRC-32 is difficult to compute because it is based on a polynomial of degree 32 that has many more terms (15) than any other CRC polynomial in common use. CRC checking and generation are generally carried out on a per-byte basis, in an attempt to cope with the dramatic increase of the data throughput of high... View full abstract»

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  • Improving the memory-system performance of sparse-matrix vector multiplication

    Publication Year: 1997, Page(s):711 - 725
    Cited by:  Papers (45)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Sparse-matrix vector multiplication is an important kernel that often runs inefficiently on superscalar RISC processors. This paper describes techniques that increase instruction-level parallelism and improve performance. The techniques include reordering to reduce cache misses (originally due to Das et al.), blocking to reduce load instructions, and prefetching to prevent multiple load-store unit... View full abstract»

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  • A study of the representation of fractal curves by L systems and their equivalences

    Publication Year: 1997, Page(s):727 - 736
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (947 KB)

    To represent fractals by means of L systems, a graphic interpretation of the L system is required. Two families of graphic interpretations have been used: turtle graphics and vector graphics. Both are proved to be equivalent for two interesting families of L systems that include many of the fractals in the literature. The equivalence theorems make it possible to start from one L system in one of t... View full abstract»

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  • Recursion leads to automatic variable blocking for dense linear-algebra algorithms

    Publication Year: 1997, Page(s):737 - 755
    Cited by:  Papers (22)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1923 KB)

    We describe some modifications of the LAPACK dense linear-algebra algorithms using recursion. Recursion leads to automatic variable blocking. LAPACK's level-2 versions transform into level-3 codes by using recursion. The new recursive codes are written in FORTRAN 77, which does not support recursion as a language feature. Gaussian elimination with partial pivoting and Cholesky factorization are co... View full abstract»

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  • Recent publications by IBM authors

    Publication Year: 1997, Page(s):757 - 767
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (769 KB)

    The information listed here is supplied by the Institute for Scientific Information and other outside sources. Reprints of the papers may be obtained by writing directly to the first author cited. Journals are listed alphabetically by title; papers are listed sequentially for each journal. View full abstract»

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  • Recent IBM patents

    Publication Year: 1997, Page(s):769 - 774
    IEEE is not the copyright holder of this material | PDF file iconPDF (412 KB)
    Freely Available from IEEE
  • Author index for papers in Volume 41

    Publication Year: 1997, Page(s):775 - 778
    IEEE is not the copyright holder of this material | PDF file iconPDF (249 KB)
    Freely Available from IEEE
  • Subject index for papers in Volume 41

    Publication Year: 1997, Page(s):779 - 784
    IEEE is not the copyright holder of this material | PDF file iconPDF (374 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