The cellular phone scare
Article Abstract:
A debate has raged in the media over whether cellular-telephone use relates to the etiology of brain cancer, even though the numerous studies conducted show no definite link. The debate is not over cordless or car phones but over portable cellular phones because they transmit more power than cordless phones and their antennas are in close proximity to users' heads. Some studies have shown possible effects on users from microwaves, but at different frequencies than those used by cellular phones. Also, statistics indicate that about 350 users of cellular phones will get cancer in 1993 regardless of their calling habits. Carefully developed standards exist for cellular phones, and in the worst case of users placing their heads next to car telephone antennas, levels are still only about on-half the level allowed by the standards. Scientists disagree over the results of some experiments, but users need to understand that zero risk is impossible to prove and that scientists can only say that extensive study does not indicate that there is any any health risk.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1993
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Cellular Mobile Technology: The Great Multiplier
Article Abstract:
While cellular mobile communications technology can greatly expand communications, some technical and regulatory problems still exist. Narrowband frequency-modulation is predominately used today, but single-sideband amplitude modulation, narrowband digital modulation, and spread-spectrum modulation all may be found superior for cellular transmission. The cellular approach improves the spectral efficiency of a system and reduces interference. Spread-spectrum techniques provide an alternative to narrowband modulation. Pseudonoise and frequency-hopped spread spectrum modulation are explained and found to reduce fading problems and are more efficient. Narrowband transmission is better understood at the moment and will probabley be used for some time. Diagrams explain spread-spectrum systems and an insert discusses technical problems of mobile communications.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1983
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The Teams and the Players: Great Britain
Article Abstract:
Great Britain will double research in information technology by a cooperative program involving industry and the government. The program, the Alvey Program for Advanced Information Technology, is a response to the Japanese technology drive and will focus on VLSI, software engineering, intelligent knowledge-based systems, and man-machine interface research. Most of the work will be done by a small consortia of industry, government, and university researchers.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1983
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