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IBM Journal of Research and Development

Issue 6 • Date Nov. 2001

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Displaying Results 1 - 12 of 12
  • Uninterruptible battery backup for IBM AS/400 systems

    Publication Year: 2001, Page(s):763 - 770
    Cited by:  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (411 KB)

    This paper describes the architecture and implementation of a DC-Uninterruptible Power Source (DC-UPS) designed as an internal component for IBM AS/400® processor and I/O towers. This DC-UPS supports a processor or I/O tower requiring a maximum of 3100 watts of input ac line power. Unlike the large majority of AC-Uninterruptible Power Sources (AC-UPSs) found in the marketplace, which supply... View full abstract»

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  • Modular server frame with robust earthquake retention

    Publication Year: 2001, Page(s):771 - 782
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (730 KB)

    Adequate retention of computer systems during earthquake events is important because it can not only prevent human injury and potential system damage, but also ensure system availability by limiting to acceptable levels the transmitted accelerations to critical system components such as hard drives. This paper discusses the design of an IBM frame structure and related hardware, and the retention m... View full abstract»

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  • Strain measurement and numerical analysis of an epoxy adhesive subjected to thermal loads

    Publication Year: 2001, Page(s):783 - 788
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (511 KB)

    This study was undertaken to improve understanding of the mechanics of residual stresses in electronic assemblies when subjected to thermal cycles. Strain-gauge measurements of stress and finite element analysis were performed to determine the residual strain level in an epoxy adhesive. Discrepancies in the stress value between experimental methods and those predicted from the finite element model... View full abstract»

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  • Embedding a secondary communication channel transparently within a cyclic redundancy check (CRC)

    Publication Year: 2001, Page(s):789 - 796
    Cited by:  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (397 KB)

    Techniques are proposed for transparently recapturing part of the capacity of a cyclic redundancy check (CRC) and using the recaptured capacity to carry a secondary communication channel. To do this, a transmitter induces CRC violations in outbound packets of a primary channel according to a set of error templates that are known to both the transmitter and the receiver, and that map one-to-one ont... View full abstract»

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  • Determination of fractal dimensions from equivalent L systems

    Publication Year: 2001, Page(s):797 - 805
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (485 KB)

    This paper revises a few existing methods for computing fractal dimensions, underlines their dependency on the graphical properties of the curves, and proposes and discusses a new method, based on the representation of fractals by means of Lindenmayer systems, that makes use of the structure of L systems to compute the fractal dimension. The method is implemented in Prolog, and its limitations and... View full abstract»

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  • Logical reversibility

    Publication Year: 2001, Page(s):807 - 818
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (542 KB)

    A method has been developed for transforming a program written in the probabilistic guarded-command language (pGCL) into an equivalent but reversible program. The method extends previous work on logical reversibility to that language and pertains to “demonic” nondeterminism and probability. Use is made of a formal definition of logical reversibility and the expectation-transformer se... View full abstract»

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  • Analytical analysis of finite cache penalty and cycles per instruction of a multiprocessor memory hierarchy using miss rates and queuing theory

    Publication Year: 2001, Page(s):819 - 842
    Cited by:  Papers (9)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (581 KB)

    Advances in technology have provided a continuing improvement in processor speed and capacity of attached main memory. The increasing gap between main memory and processor cycle times has required increasingly more levels of caching to prevent performance degradation. The net result is that the inherent delay of a memory hierarchy associated with any computing system is becoming the major performa... View full abstract»

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  • Recent publications by IBM authors

    Publication Year: 2001, Page(s):843 - 848
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 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: 2001, Page(s):849 - 855
    IEEE is not the copyright holder of this material | PDF file iconPDF (364 KB)
    Freely Available from IEEE
  • Author index for papers in Volume 45

    Publication Year: 2001, Page(s):857 - 861
    IEEE is not the copyright holder of this material | PDF file iconPDF (435 KB)
    Freely Available from IEEE
  • Subject index for paper in Volume 45

    Publication Year: 2001, Page(s):863 - 868
    IEEE is not the copyright holder of this material | PDF file iconPDF (501 KB)
    Freely Available from IEEE
  • Editor's Note

    Publication Year: 2001, Page(s): 870
    IEEE is not the copyright holder of this material | PDF file iconPDF (410 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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Meet Our Editors

Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center