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Proceedings of the IEEE

Issue 7 • Date Jul 1989

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Displaying Results 1 - 9 of 9
  • Large-scale problems and supercomputing in the Department of Energy

    Publication Year: 1989, Page(s):1020 - 1037
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1900 KB)

    Examples of important US Department of Energy (DOE) supercomputer applications are given, including energy systems design, weapons systems design, and basic research. Computational techniques used in these applications are discussed, along with results and outstanding problems. The DOE's approach to providing supercomputer resources to its researchers is outlined, including descriptions of the sup... View full abstract»

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  • Science and computing

    Publication Year: 1989, Page(s):1018 - 1019
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    The author contends that computers are unprecedented among human inventions in that they are a boon to experimenters and theorists alike. He points out that the power of computers has grown, and their cost has decreased, at a high-exponential rate-over the last 35 years; and the end is not in sight. In the last 33 years supercomputers, currently the most powerful computers, were needed to solve ba... View full abstract»

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  • Time-frequency distributions-a review

    Publication Year: 1989, Page(s):941 - 981
    Cited by:  Papers (1780)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3452 KB)

    A review and tutorial of the fundamental ideas and methods of joint time-frequency distributions is presented. The objective of the field is to describe how the spectral content of a signal changes in time and to develop the physical and mathematical ideas needed to understand what a time-varying spectrum is. The basic gal is to devise a distribution that represents the energy or intensity of a si... View full abstract»

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  • Millimeter and submillimeter wavelength radioastronomy

    Publication Year: 1989, Page(s):993 - 1017
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2412 KB)

    The significance of radio astronomy at millimeter and submillimeter wavelengths is described, and some of the more important results are given. The limitations imposed by the atmosphere are discussed, and the observation techniques used to overcome these limitations are outlined. The major new millimeter and submillimeter telescopes are described, and the techniques used to construct large-diamete... View full abstract»

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  • Comments, with reply on `Continuous time relay-controlled model reference adaptive-system' by A. Abdulkareem and R. Nagarajam

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (44 KB)

    An adaptive scheme is shown by the authors of the above paper (ibid., vol.71, no.2, p.275-6, Feb. 1983) for continuous time model reference adaptive systems (MRAS), where relays replace the usual multipliers in the existing MRAS. The commenter shows an error in the analysis of the hyperstability of the scheme, such that the validity of this configuration becomes an open question View full abstract»

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  • Supercomputer requirements for selected disciplines important to aerospace

    Publication Year: 1989, Page(s):1038 - 1055
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2020 KB)

    Speed and memory requirements placed on supercomputers by five different disciplines important to aerospace are discussed and compared with the capabilities of various existing computers and those projected to be available before the end of this century. The disciplines chosen for consideration are turbulence physics, aerodynamics, aerothermodynamics, chemistry, and human vision modeling. Example ... View full abstract»

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  • Subcompact hydrogen maser atomic clocks

    Publication Year: 1989, Page(s):982 - 992
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB)

    Recent progress in compact hydrogen maser atomic frequency standards or clocks is reviewed. After a brief description of the principle of a hydrogen maser, the techniques used to realize high-performance compact hydrogen masers are discussed. Two approaches in compact hydrogen maser design are presented. The first approach uses active or atomic resonance sustained maser oscillation. The design use... View full abstract»

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  • Computational approaches to discovering semantics in molecular biology

    Publication Year: 1989, Page(s):1056 - 1060
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    One of the central problems of molecular biology stems from the discovery of the semantics of DNA. This discovery relies in a critical way on a variety of expensive computations. In order to solve these computations, both parallel computers and special-purpose hardware play a major role. The authors discuss the basic methodology involved in discovering the evolutionary structure of both DNA and pr... View full abstract»

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  • Scientific computing challenges arising from space-borne observations

    Publication Year: 1989, Page(s):1061 - 1091
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4784 KB)

    Five supercomputing problems are described: (1) determining the motions of the Earth's inner core boundary from outer-space measurements of the magnetic field; (2) simulating the global dynamics of the Earth's ocean currents, sea-ice cycles, land surface biology, and interannual atmospheric climates; (3) upper atmospheric chemistry; (4) modeling solar flare eruptions; and (5) the role of jet proce... View full abstract»

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