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Proceedings of the IEEE

Issue 10 • Date Oct. 1987

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Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Page(s): 1347
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    Freely Available from IEEE
  • Advanced parallel processing with supercomputer architectures

    Page(s): 1348 - 1379
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    This paper investigates advanced parallel processing techniques and innovative hardware/software architectures that can be applied to boost the performance of supercomputers. Critical issues on architectural choices, parallel languages, compiling techniques, resource management, concurrency control, programming environment, parallel algorithms, and performance enhancement methods are examined and the best answers are presented. We cover advanced processing techniques suitable for supercomputers, high-end mainframes, minisupers, and array processors. The coverage emphasizes vectorization, multitasking, multiprocessing, and distributed computing. In order to achieve these operation modes, parallel languages, smart compilers, synchronization mechanisms, load balancing methods, mapping parallel algorithms, operating system functions, application library, and multidiscipline interactions are investigated to ensure high performance. At the end, we assess the potentials of optical and neural technologies for developing future supercomputers. View full abstract»

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  • Communications switching—From operators to photonics

    Page(s): 1380 - 1403
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    Very soon after Alexander Graham Bell invented the telephone, it became obvious that it would be impractical to extend wires from every telephone to all other telephones. To conserve copper and dollars, wires had to converge on central points where individual telephone-to-telephone connections would be made. In this paper we will describe many significant changes in the Bell System network from the early part of this century when manual switching systems predominated to the stored program controlled electronic switching network which existed in 1984 at the time of the Bell System divestiture; as well as the current thrusts in digital switching, packet switching, distributed control, and research in broad-band and optical switching technology. View full abstract»

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  • Radio propagation experiments in the outer solar system with Voyager

    Page(s): 1404 - 1431
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    Microwave telecommunications transmissions from the two Voyager spacecraft are being used to make detailed studies of planetary atmospheres, ionospheres, rings, and magnetic fields in the outer solar system. Coherently related sinusoidal signals, at wavelengths of 3.6 and 13 cm, transmitted from Voyager but received and analyzed on Earth serve as an active probe of planetary environs. Such studies have been carried out during the spacecraft encounters of Jupiter, Saturn, and Uranus; observations of Neptune's system are planned for August, 1989. The required occultation geometries are obtained either as by-products of the gravity-assist trajectories employed to travel among the planets or, in some cases, by design. Both spacecraft and ground systems are specifically modified and improved to support radio investigations. In particular, the use of hydrogen maser frequency standards on the ground in conjunction with thermally controlled, radiation-hardened quartz oscillators on the spacecraft guarantees long coherence intervals and allows application of new signal processing techniques. These advances lead to spatial resolutions in the media of interest well below the Fresnel zone scale, to current limits of a few tens of meters in the rings of Uranus. The present theory and data reduction methods permit detailed studies of atmospheric structure and scintillation parameters, the radial structure and particle size distribution of planetary rings, and the magnetic control of small-scale ionospheric irregularities. Atmospheric measurements are made at pressures from a few tenths of a millibar to a few bars, extinction profiles of planetary rings have been made to slant optical depths of 8 to 10, and alignments of magnetic fields within ionized regions have been determined to within a few degrees. Fundamental information concerning planetary composition, evolution, and dynamics is obtained from these measurements. Future improvements in radio systems through the use of powerful (> 100 000-W) ground transmitters in conjunction with high-performance receiving and digital signal processing units aboard spacecraft would permit improvements in dynamic range and sensitivity of such propagation experiments of 20 to 40 dB. View full abstract»

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  • Use of a surface-acoustic-wave (SAW) device to monitor etching of thin films

    Page(s): 1432 - 1434
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    The use of a surface-acoustic-wave (SAW) device to monitor etching of thin films is described. The device is a delay-line-stabilized SAW oscillator in which the propagation path is coated with a thin film of the material to be etched. Removal of material decreases the mass loading on the delay line and this increases the frequency of the oscillator. The frequency of a 75-MHz oscillator is found to increase by more than 690 KHz for 1-µm decrease in film thickness. Using dual-oscillator arrangement, one can simultaneously monitor substrate temperature as well as thickness of material removed. View full abstract»

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  • Stable on-line creation of sines or cosines of successive angles

    Page(s): 1434 - 1435
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    Two tables of length log2N suffice for the on-line creation of sines or cosines of N successive angles, With only one addition and one multiplication per step. View full abstract»

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  • Transient mean and variance of overflow traffic in a loss system

    Page(s): 1435 - 1436
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    Simple techniques to approximate the mean and variance of the overflow traffic in a telephone system are outlined. The mean is first approximated, and by using the peakedness value obtained via the interrupted Poisson process, the variance is then approximated. View full abstract»

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  • The regenerative receiver and the synchronous oscillator

    Page(s): 1437
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    The regenerative receiver [1] and the synchronous oscillator (SO) [2]-[4] have one common functional property, that is, their sensitivity is inversely proportional to the input signal level While the regenerative receiver operates in a threshold condition where noise is high, the stability and the selectivity are poor, the SO functions when stable oscillations are maintained and selectivity is good and the noise is low. Although the regenerative receiver is an AM-to-AM converter, the SO is an AM-to-PM converter. View full abstract»

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  • Expert sysems and fuzzy systems

    Page(s): 1438 - 1439
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  • Passive and active filters

    Page(s): 1438
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  • Book alert

    Page(s): 1439
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  • [Back cover]

    Page(s): c4
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The most highly-cited general interest journal in electrical engineering and computer science, the Proceedings is the best way to stay informed on an exemplary range of topics.

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Editor-in-Chief
H. Joel Trussell
North Carolina State University