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IEEE Potentials

Issue 4 • Date Dec. 1989

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Displaying Results 1 - 6 of 6
  • DNA's lasting imprint

    Publication Year: 1989, Page(s):6 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The use of DNA typing for the examination of forensic casework and the establishment of paternity is discussed. A description is given of DNA-based identification testing procedures, most of which involve the use of restriction endonucleases, DNA probes, and Southern blot hybridization. Restriction endonucleases are enzymes that cleave a person's DNA, at specific recognition sites, into a reproduc... View full abstract»

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  • Alpha quartz

    Publication Year: 1989, Page(s):9 - 12
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The history of the use of alpha quartz, SiO/sub 2/, one of the nine forms of silica is sketched, and its structure and crystallography are described. Piezoelectricity, the most important property of quartz from an electrical standpoint, is explained. Processing of quartz crystals to ensure proper operation in circuits is discussed. The two primary types of device made from quartz crystal plates or... View full abstract»

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  • Telephones you can talk to

    Publication Year: 1989, Page(s):13 - 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (363 KB)

    A speaker-dependent speech recognizer for connected sequences of digits that uses a time-delayed neural network (TDNN) is described. The advantage of using a TDNN is that, at any given instant, acoustic features of the speech signal for a past interval of time up to the present can be observed simultaneously. Thus, once the system is trained, no detection of boundaries between words is necessary f... View full abstract»

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  • HDTV-what's going on?

    Publication Year: 1989, Page(s):18 - 21
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1173 KB)

    The economic and signal environment into which high-definition television (HDTV) must fit is described, and the resulting technology requirements are examined. These include advanced signal processing, image processing, communications, and display technology. The two factors dictating these requirements are examined: the need for compatibility with existing National Television Standards Committee ... View full abstract»

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  • Some legal aspects of engineering

    Publication Year: 1989, Page(s):30 - 31
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (273 KB)

    Several legal areas of interest to the practicing engineer are discussed. They are: intellectual property (ideas, copyrights, patents); working papers (confidentiality, employees' right to copies); working conditions (environment, relations with others, compensation); government regulations (rules defining a qualified engineer); ethics (moral judgments resulting in legal consequences); and forensi... View full abstract»

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  • Computer memory: abacus to DRAM

    Publication Year: 1989, Page(s):32 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (429 KB)

    Basic concepts of the first computer memory, the abacus, and the current DRAM (dynamic random-access memory) are discussed. The abacus was the main memory for the first electronic digital computer, the ABC (Atanasoff-Berry Computer). Built between 1939 and 1942, the ABC was a special-purpose machine designed to solve a system of linear algebraic equations. The similarities and differences between ... View full abstract»

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IEEE Potentials is the magazine dedicated to undergraduate and graduate students and young professionals.

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Editor-in-Chief
Sachin Seth
Texas Instruments
sachin3006@gmail.com