Volume 30 Issue 6 • June 1993

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Displaying Results 1 - 5 of 5
  • Personal wireless

    Publication Year: 1993, Page(s):20 - 25
    Cited by:  Papers (9)  |  Patents (20)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (885 KB)

    Personal communication services (PCSs), whereby individuals carry small, inexpensive handheld communicators and can be reached by voice or data with a single phone number, wherever they may be, are discussed. Some early experiments with PCS systems are noted, and problems encountered or anticipated are examined. These include cost, infrastructure, and spectrum issues.<<ETX>> View full abstract»

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  • Neural networks at work

    Publication Year: 1993, Page(s):26 - 32
    Cited by:  Papers (40)  |  Patents (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1065 KB)

    The benefits of neural networks and the types of application for which they are suited are outlined. Four representative applications are described in enough detail to show how they work. They are character recognition, function estimation, financial forecasting, and process control. Factors that have slowed the acceptance of neural networks are discussed. Hardware is briefly considered.<<ET... View full abstract»

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  • VHDL-panacea or hype?

    Publication Year: 1993, Page(s):34 - 37
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (578 KB)

    The status of Std IEEE 1076, the standard for VHDL (VHSIC Hardware Description Language; VHSIC stands for very-high-speed integrated circuit) and its likely future use and development are examined. The genesis of VHDL is recounted, and its use in the US and Europe is discussed. Problems with VHDL are considered.<<ETX>> View full abstract»

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  • Storing power for critical loads

    Publication Year: 1993, Page(s):38 - 42
    Cited by:  Papers (13)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (797 KB)

    The operation of systems for superconducting magnetic-energy storage (SMES) is explained. The original goal was systems storing thousands of megawatts of back-up electricity for several hours at a time, to help utilities meet peak power demands. The first commercially available unit rapidly stores and delivers much less electricity over much briefer periods-megawatts for seconds only. It excels in... View full abstract»

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  • The cellular phone scare

    Publication Year: 1993, Page(s):43 - 47
    Cited by:  Papers (12)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (678 KB)

    The scare about cellular phones causing brain cancer is examined in the light of what is known about: effects of RF radiation on human beings. The concern focused on the portable cellular phones that can be slipped into a pocket or purse, because their antennas lie right alongside a user's head. Standards for electromagnetic (EM) radiation exposure are discussed, and research results to date on th... View full abstract»

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