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IBM Journal of Research and Development

Issue 1 • Date Jan. 1989

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Displaying Results 1 - 7 of 7
  • The dynamics of slider bearings during contacts between slider and disk

    Publication Year: 1989, Page(s):2 - 14
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (992 KB)

    The dynamics of a “mini-Winchester” magnetic recording slider are studied during contacts with a hard, rotating memory disk using numerical simulation. An on-line solution of the Reynolds equation is used to calculate the air-film pressure, and a “coefficient-of-restitution” model is used to describe intermittent slider/disk contacts. Studies are made to identify system... View full abstract»

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  • Functional cache chip for improved system performance

    Publication Year: 1989, Page(s):15 - 32
    Cited by:  Papers (2)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1402 KB)

    The use of a cache to improve the performance of computing systems is becoming very pervasive, from microprocessors to high-end systems. The general approach has traditionally been to use ordinary fast RAM chips and interface these close to the processor for speed. However, this is far from the ideal solution. The stringent and often conflicting requirements on the cache bandwidth for servicing th... View full abstract»

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  • Modeling electromagnetic interference properties of printed circuit boards

    Publication Year: 1989, Page(s):33 - 50
    Cited by:  Papers (39)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1244 KB)

    The mathematical modeling of a printed circuit board (PCB) for the prediction of its electromagnetic interference (EMI) properties is investigated. Two key aspects examined are crosstalk and the high-frequency voltage developed between the ends of a PCB land (ground drop). The notion of partial inductance as opposed to loop inductance is the key to predicting the high-frequency voltages that are d... View full abstract»

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  • Analysis of block-paging strategies

    Publication Year: 1989, Page(s):51 - 59
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (805 KB)

    The performance of interactive paging systems in general and Virtual Machine/System Product (VM/SP) systems with the High Performance Option (HPO) in particular depends upon locality of reference. This storage-management dependency, often considered in the context of individual programs, extends in fact to a significant degree across most virtual-machine transactions. This paper investigates strat... View full abstract»

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  • Statistical properties of selected recording codes

    Publication Year: 1989, Page(s):60 - 73
    Cited by:  Papers (23)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1125 KB)

    Most recording systems encode their data using binary run-length-limited (RLL) codes. Statistics such as the density of 1s, the probabilities of specific code strings or run lengths, and the power spectrum are useful in analyzing the performance of RLL codes in these applications. These statistics are easy to compute for ideal run-length-limited codes, those whose only constraints are the run-leng... View full abstract»

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  • Recent publications by IBM authors

    Publication Year: 1989, Page(s):74 - 85
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (988 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. Information on books may be obtained by writing the publisher. Papers and books are listed alphabetically by author. View full abstract»

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  • Recent IBM patents

    Publication Year: 1989, Page(s):86 - 88
    IEEE is not the copyright holder of this material | PDF file iconPDF (240 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