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IBM Journal of Research and Development

Issue 5 • Date Sept. 1990

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Displaying Results 1 - 13 of 13
  • Preface

    Publication Year: 1990, Page(s):634 - 635
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (185 KB)

    A previous issueo f the IBM Journal of Research and Development (May 1987) addressed the topic of computer-aided design (CAD) of products. The present issue is a logical successor, exploring modeling techniques implemented in software for the representation and analysis of products and their manufacturing processes. These techniques, which have come to be known as virtual prototyping, have as basi... View full abstract»

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  • A modeling system for top-down design of assembled products

    Publication Year: 1990, Page(s):636 - 659
    Cited by:  Papers (8)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1813 KB)

    The design of a mechanical product usually takes place primarily in a top-down fashion, where the designer first generates a rough, overall sketch of the product and its main components. Later, the designer refines the sketch to a detailed level while taking into account the relevant requirements posed by strength, cost, manufacturability, serviceability, and other similar considerations. Current ... View full abstract»

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  • Computer-aided design of slider bearings in magnetic disk files

    Publication Year: 1990, Page(s):660 - 667
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (711 KB)

    This paper reviews the application of lubrication theory to slider bearings in magnetic disk files. For more than thirty years, slider bearings have been used to maintain close and precise spacings between recording transducer and recording medium in disk files. Computer modeling has been central to the design and performance analysis of these systems. The topics covered are the basic design, sens... View full abstract»

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  • Disk file access-time constraints imposed by magnetic air-bearing compliance

    Publication Year: 1990, Page(s):668 - 679
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (901 KB)

    Use is commonly made of coil voltages which produce maximum acceleration and deceleration to wrest the fastest access performance from the actuator of a disk file. Alternatively, equivalent performance is easily obtained with less control optimality by simply increasing the coil voltage. A limit to greater coil voltage, however, arises from the need to avoid harmful effects when the servo loses co... View full abstract»

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  • A simple finite element model for reactive sputter-deposition systems

    Publication Year: 1990, Page(s):680 - 692
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1135 KB)

    The method of finite element analysis is used to calculate oxygen-concentration profiles and oxygen-absorption rates at the substrate and along the shields in an rf magnetron reactive sputtering system having a 12-inch-diameter magnetron. Results for several shield arrangements are calculated as a function of oxygen flow rate. The approach used assumes the following: (i) The target is being sputte... View full abstract»

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  • Computation of current distribution in electrodeposition, a review

    Publication Year: 1990, Page(s):693 - 705
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1278 KB)

    This paper reviews the research literature that has appeared since 1980 on computer calculations of current distribution in the field of electrodeposition. Key contributions and general trends are identified, with particular emphasis given to applications in the electronics industry. The survey reveals how numerical models have provided the technology of electrodeposition with general understandin... View full abstract»

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  • Finite element analysis of planar stress anisotropy and thermal behavior in thin films

    Publication Year: 1990, Page(s):706 - 717
    Cited by:  Papers (17)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1048 KB)

    To show the capability and diversity of finite element analysis, we calculate three-dimensional planar anisotropic stress distributions for various thin-film geometries and materials in response to thermal and electrical stimuli, for specific boundary conditions. The simulated residual film stresses are verified with acoustic microscopy measurements, substrate flexure measurements, and the use of ... View full abstract»

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  • Thermoelastic behavior of X-ray lithography masks during irradiation

    Publication Year: 1990, Page(s):718 - 735
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1458 KB)

    This paper presents computer calculations of thermoelastic effects in X-ray lithography masks caused by the absorption of X-rays during exposure. Several mask structures are considered, with different substrate and absorber materials, using finite element analysis. Part I of the paper deals with short-pulse X-ray irradiation (e.g., from gas plasma, laser-heated plasma, or exploding wire sources), ... View full abstract»

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  • Pythagorean hodographs

    Publication Year: 1990, Page(s):736 - 752
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1239 KB)

    The hodograph of a plane parametric curve r(t) = {x(t), y(t)} is the locus described by the first parametric derivative r′ (t) = {x′ (t), y′ (t)} of that curve. A polynomial parametric curve is said to have a Pythagorean hodograph if there exists a polynomial σ(t) such that x′2(t) + y′2(t) ≡ σ... View full abstract»

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  • Finding compact coordinate representations for polygons and polyhedra

    Publication Year: 1990, Page(s):753 - 769
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1285 KB)

    Practical solid modeling systems are plagued by numerical problems that arise from using floating-point arithmetic. For example, polyhedral solids are often represented by a combination of geometric and combinatorial information. The geometric information may consist of explicit plane equations, with floating-point coefficients; the combinatorial information may consist of face, edge, and vertex a... View full abstract»

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  • Finding the distance between two circles in three-dimensional space

    Publication Year: 1990, Page(s):770 - 775
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (507 KB)

    In this paper we investigate, from an algebraic point of view, the problem of finding the distance between two circles located in ℝ3 . We show, by combining a theorem about solvable permutation groups and some explicit calculations with a computer algebra system, that, in general, the distance between two circles is an algebraic function of the parameters defining them, but that ... View full abstract»

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  • Recent publications by IBM authors

    Publication Year: 1990, Page(s):776 - 790
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1248 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 sequentiallyfor each journal. View full abstract»

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  • Recent IBM patents

    Publication Year: 1990, Page(s):791 - 792
    IEEE is not the copyright holder of this material | PDF file iconPDF (170 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