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IEEE Spectrum

Issue 9 • Date Sept. 1990

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Displaying Results 1 - 8 of 8
  • Technical challenges to a decentralized phone system

    Publication Year: 1990, Page(s):32 - 37
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (690 KB)

    Changes that followed in the wake of the divestiture of AT&T are examined. One of these is the growth of new services, particularly ISDN and Switching System No.7 (SS7) services. Another is that setting standards has become a public and global, rather than strictly AT&T-determined, process. Waiting for standards is slowing innovations in the networks, because major equipment vendors to not want to... View full abstract»

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  • Characterizing high-speed oscilloscopes

    Publication Year: 1990, Page(s):38 - 39
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (277 KB)

    A technique for measuring the risetimes of the fastest of these instruments, which will allow more accurate measurement of the fastest pulses, is described. The sampling process used by these oscilloscopes is essentially a brief switch closure of a few picoseconds between the signal to be measured at the oscilloscope input and a holding capacitor in the detection circuit. During this switch closur... View full abstract»

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  • New tricks for an old power source (fuel cells)

    Publication Year: 1990, Page(s):40 - 43
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The results of a successful Japanese effort to make fuel cells commercially viable are discussed. The three main types of fuel cell being applied to or developed for terrestrial electric-power applications are distinguished chiefly by their electrolytes: phosphoric acid; a mixture of molten lithium, sodium, and potassium carbonate; or solid zirconium oxide stabilized with yttrium oxide. A descript... View full abstract»

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  • The technical ladder gets harder to climb (engineering career advancement)

    Publication Year: 1990, Page(s):46 - 47
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (206 KB)

    Career advancement for engineers as the number of promotional positions, both managerial and technical, are becoming fewer is addressed. The technical ladder, which offers an alternative to the traditional managerial ladder for engineering career advancement, is described. It is argued that the technical ladder is an important tool for personal growth is used correctly, and ways of doing so are ex... View full abstract»

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  • Evaluating nonlinear models for microwave GaAs FETs

    Publication Year: 1990, Page(s):48 - 50
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (554 KB)

    It is pointed out that although quite a number of nonlinear descriptions are available for modeling microwave GaAs MESFETs (GaAs FETs), their accuracy is much debated. Like their silicon bipolar counterparts, the GaAs FET models are based on experimental curve tracer measurements and a limited set of scattering parameters (S-parameters) measured at convenient bias points. Hence, it is impossible t... View full abstract»

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  • The stored program concept

    Publication Year: 1990
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (133 KB)

    The history and early development of the stored program concept are briefly described. This refers to the ability of a calculating machine to store its instructions in its internal memory and process them in its arithmetic unit, so that in the course of a computation they may be not just executed but also modified at electronic speeds. John von Neumann, a faculty member of the Institute for Advanc... View full abstract»

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  • A view from the other side (engineering education)

    Publication Year: 1990, Page(s):52 - 54
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A former General Electric engineer and manager who turned to teaching dispels seven common myths about academia. These myths are that academia is highly inefficient; those who can't practice, teach; teaching is a nice way to retire; tenure breeds mediocrity; only people with practical experience should teach; the US lost its competitive edge in manufacturing because of research-dominated engineeri... View full abstract»

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  • Industries transcend national boundaries

    Publication Year: 1990, Page(s):26 - 31
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (851 KB)

    Companies in automaking, TV, and superconductors are used to exemplify how manufacturing processes, R&D alliances, and government policies are advancing competitiveness in borderless economies. The phenomenal rise of worldwide productivity growth, spurred by big retooling investments since 1982 and by designing products for ease of production, is examined. The lead that Europe and Japan have over ... View full abstract»

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