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Proceedings of the IEEE

Issue 4 • April 1974

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Displaying Results 1 - 25 of 33
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1974, Page(s):419 - 420
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    Freely Available from IEEE
  • The challenge of computer graphics in continental western Europe

    Publication Year: 1974, Page(s):421 - 428
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3386 KB)

    Computer graphics applications, software, and hard-ware research, are examined and evaluated in Continental Western Europe. Growth has been slow. The reasons are the high cost of hardware and the complexity of the required software. The past reveals a rather dim picture. Mechanical engineering applications have shown some promising success. Electrical engineering applications have been effective m... View full abstract»

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  • Building highway systems with computer graphic simulations

    Publication Year: 1974, Page(s):429 - 436
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1938 KB)

    A number of computer applications generate perspective drawings of proposed highway designs as a means of design evaluation. The use of this capability is rare in the United States. Examples, developed in France, show computer-generated perspective drawings simulating several actual highway design situations. Highway construction costs are rapidly increasing in the United States prompting a need f... View full abstract»

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  • Computer graphics in urban and environmental systems

    Publication Year: 1974, Page(s):437 - 452
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3267 KB)

    The key role played by computer graphics in urban, regional, and environmental information systems is surveyed by reference to specific examples. While the interactive cathode-ray tube terminal is found to be the most valuable medium, other output devices such as printers and plotters are discussed as well. Elements of computer cartography and data base organization are introduced, followed by dis... View full abstract»

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  • Three-dimensional data input by tablet

    Publication Year: 1974, Page(s):453 - 461
    Cited by:  Papers (87)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2132 KB)

    A large-area multiple-pen tablet system for three-dimensional data input is described. The large tablet area provides space for simultaneous use of several views of the three-dimensional object being digitized. The multiple pens enable the user to indicate a single point simultaneously in two such views, thus defining the three-dimensional position of the point. Five significant techniques are out... View full abstract»

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  • The art of natural graphic man—Machine conversation

    Publication Year: 1974, Page(s):462 - 471
    Cited by:  Papers (71)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1159 KB)

    The design of interactive graphic systems whose aim is good symbiosis between man and machine involves numerous factors. Many of those factors can be judged from the perspective of natural spoken conversation between two people. Guiding rules and principles for design of such systems are presented as a framework for a survey of design techniques for man-machine conversation. Attention is especiall... View full abstract»

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  • An approach to graphics system design

    Publication Year: 1974, Page(s):471 - 483
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1394 KB)

    A discussion of some of the problems that arise in the design of high-level general-purpose device-independent graphics systems is presented. These problems are shown to be most easily solved by avoiding the use of complex display data structures prior to the picture transformation process. The use of a display file containing the transformed picture is proposed instead. This approach restricts th... View full abstract»

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  • Intelligent satellites for interactive graphics

    Publication Year: 1974, Page(s):483 - 492
    Cited by:  Papers (13)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1145 KB)

    The spectrum of remote user stations with local processing ability, ranging from simple "smart" terminals to nearly self-sufficient intelligent systems called satellites, is considered. The emphasis is on the latter category, drawing on the authors' research on intelligent satellites for interactive graphics. The necessity of meeting a "critical intelligence threshold" criterion for the satellite ... View full abstract»

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  • Computer-encouraged serendipity in pure mathematics

    Publication Year: 1974, Page(s):493 - 495
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB)

    Computer applications to research in pure mathematics during the past several years have concentrated on using the data processing and logical capabilities of computers to carry out exhaustive and exhausting combinatorial or logical manipulations. Computers can also be used to suggest entirely new theorems and results, but this sort of application has not yet been particularly widely investigated.... View full abstract»

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  • Portfolio of shaded computer images

    Publication Year: 1974, Page(s):496 - 502
    Cited by:  Papers (1)
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    First Page of the Article
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  • Computer graphics and art

    Publication Year: 1974, Page(s):503 - 515
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7780 KB)

    A survey of basic ideas and approaches to computer art is given. Statements are presented by several computer artists as well as illustrations of their work. Comments are made about the relationship of computer graphics to art including a brief historical sketch of developments in this area. A conceptual framework is presented for interactive art objects as an art form. Suggestions are made about ... View full abstract»

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  • On angular resolution in microwave radar

    Publication Year: 1974, Page(s):519 - 520
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The large dynamic range required to obtain stable microwave images causes angular resolution to be a function of the sidelobe level. It is particularly significant in synthetic aperture radar. It is shown that a modest tapering of the synthetic aperture offers a dramatic potential improvement. View full abstract»

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  • On the pole locations of sharp cutoff low-pass filters

    Publication Year: 1974, Page(s):520 - 521
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (234 KB)

    It is shown that the poles of sharp cutoff low-pass filters, Butterworth- or Chebyshev-derived, can be obtained analytically for orders 3, 4, 6, and 8, through the solution of quadratic, cubic, or quartic algebraic equations. For the Butterworth case, higher order filters having a value of 3, 4, 6, 8 for the ratio (order of filter)/(order of zero) are also shown to have analytical solutions for th... View full abstract»

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  • A circuit for floating inductance simulation

    Publication Year: 1974, Page(s):521 - 523
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (306 KB)

    An active RC realization of a lossy floating inductor is presented. The circuit uses two operational amplifiers--each in the unity gain connection--three resistors, and two capacitors, and has low L and Q sensitivities to passive as well as active components. View full abstract»

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  • RF voltage breakdown and the Paschen curve

    Publication Year: 1974, Page(s): 521
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    A representation based on the similarity relations for voltage breakdown is shown to be useful in combining RF and dc voltage breakdown data. The representation for the uniform field geometry is given. View full abstract»

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  • A new voltage-tunable distributed RC notch filter suitable for SOS realization

    Publication Year: 1974, Page(s):523 - 524
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    It is shown that a combination of two MOS distributed RC elements can be designed to produce a tunable notch filter in which conductance modulation as well as MOS capacitance contribute to tunability, and the conductance modulation does not de-optimize the null. View full abstract»

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  • Longitudinal-strain coefficient of resistivity of thin silver film

    Publication Year: 1974, Page(s):524 - 526
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The grain-boundary model proposed by Mayadas et al. has been used to calculate the longitudinal-strain coefficient of resistivity of continuous polycrystalline silver film, with a thickness greater than the intrinsic mean free path, in terms of grain-size diameter. It has been found that the longitudinal-strain coefficient of resistivity increases with grain size, and its range is from zero to bul... View full abstract»

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  • Experimental microwave study of metal-to-metal point-contact diodes

    Publication Year: 1974, Page(s):526 - 529
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB)

    New characteristics obtained with metal-insulator-metal (MIM) diodes are studied. These new characteristics are interpreted according to the tunneling process, and they are compared with the characteristics one can obtain with the IN23 diodes. View full abstract»

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  • Feature selection and the concept of immediate neighborhood in the context of clustering techniques

    Publication Year: 1974, Page(s):529 - 530
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (287 KB)

    The concept of feature selection in a nonparametric unsupervised learning environment is practically undeveloped because no true measure for the effectiveness of a feature exists in such an environment. The lack of a feature selection phase preceding the clustering process seriously affects the reliability of such learning. New concepts such as significant features, level of significance of featur... View full abstract»

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  • Estimations based on instants of occurrence of photoevents of low-level light

    Publication Year: 1974, Page(s):530 - 531
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (261 KB)

    An approximate expression is found for the joint probability of instants of occurrence of photoevents in the case of low-level light and short observation times. The use of this expression in estimating the average count rate and the bandwidth of Gaussian-Lorentzian light is discussed. View full abstract»

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  • Convolution using the nonlinear interaction of surface-acoustic waves on barium titanate

    Publication Year: 1974, Page(s):531 - 532
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (418 KB)

    The convolution of two 12-MHz contradirected surface-acoustic wave signals on barium titanate has been observed. Overall conversion losses in the signal processing were approximately 60 dB. A 3-6-dB enhancement of convolved signal amplitude was achieved by the application of an external polarizing field to the output electrodes. View full abstract»

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  • Aperture antenna with non-Gaussian phase errors

    Publication Year: 1974, Page(s):532 - 533
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (217 KB)

    The letter derives the mean radiation pattern of an aperture with random phase errors of the excitation when the errors are a stationary random, but not necessarily normal, function with given probability distribution and correlation coefficient. The case of exponential errors is investigated as an example. View full abstract»

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  • Direct computation of the distribution function from the characteristic function

    Publication Year: 1974, Page(s):533 - 534
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB)

    A simple and exact method to compute the cumulative distribution function directly from the characteristic function is proposed. This method is completely insensitive to errors associated with the divergence of the integral defining the Fourier transform of the distribution function. View full abstract»

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  • Deep-level defects in red GaAs1-xPxlight-emitting diodes

    Publication Year: 1974, Page(s):534 - 535
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (253 KB)

    A wide variety of deep-level recombination centers have been observed at large concentrations in commercially available red GaAsP light-emitting diode p-n junctions. Similar defects have not been observed in GaP diodes. The characteristics, probable cause, and possible effect on luminescence efficiency of these deep-level defect centers are described. View full abstract»

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North Carolina State University