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Proceedings of the IEEE

Issue 12 • Date Dec. 1968

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Displaying Results 1 - 25 of 43
  • [Front cover and table of contents]

    Publication Year: 1968, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1968, Page(s): 2099
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  • Voluntary page charges

    Publication Year: 1968, Page(s): 2100
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    Freely Available from IEEE
  • Annual index 1968

    Publication Year: 1968, Page(s): 2100
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    Freely Available from IEEE
  • On pattern classification algorithms introduction and survey

    Publication Year: 1968, Page(s):2101 - 2114
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1373 KB)

    This paper attempts to lay bare the underlying ideas used in various pattern classification algorithms reported in the literature. It is shown that these algorithms can be classified according to the type of input information required and that the techniques of estimation, decision, and optimization theory can be used to effectively derive known as well as new results. View full abstract»

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  • The interferometer in radio astronomy

    Publication Year: 1968, Page(s):2114 - 2130
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1663 KB)

    A theory is developed for the response of a two-element radio interferometer to a partially coherent field, without restriction as to bandwidth or antenna properties. It is shown that for a completely incoherent source the narrow-band interferometer output is a component of the Fourier transform of the source brightness, which can therefore be mapped by repeated interferometer observations. A part... View full abstract»

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  • Effects of a turbulent atmosphere on the phase and frequency of optical waves

    Publication Year: 1968, Page(s):2130 - 2136
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (618 KB)

    The main theme is a tutorial presentation of the major effects of atmospheric turbulence on the phase and frequency of electromagnetic waves in the optical spectrum. The emphasis is not on a comprehensive review, but rather on the tutorial aspect. Starting from fundamental principles, all significant results are derived by simple physical reasoning and are compared to existing ones in the literatu... View full abstract»

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  • Decay of residual plasma in a vacuum gap after forced extinction of a 250-ampere arc

    Publication Year: 1968, Page(s):2137 - 2145
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (926 KB)

    The decaying plasma present within an experimental vacuum switch following the forced extinction of a 250-ampere arc across silver electrodes is studied. Ions and electrons are collected by applying a 6-volt potential across the vacuum device at various predetermined delay intervals after arc extinction. The magnitudes of the peak currents collected by this means vary from about ½ ampere a fe... View full abstract»

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  • Reflective liquid crystal television display

    Publication Year: 1968, Page(s):2146 - 2149
    Cited by:  Papers (14)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    A new reflective television display, operating off the air, is described. The display uses the dynamic scattering mode (DSM) in nematic liquid crystals and can be viewed in high-brightness ambients. The liquid crystal cell, 6 to 12 µm thick, was addressed in real time by means of an electron beam using a wire-mosaic faceplate on a demountable cathode ray tube. Two different liquid crystal mat... View full abstract»

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  • Asymptotic evaluation of the ambiguity functions of high-gain FM matched filter sonar systems

    Publication Year: 1968, Page(s):2149 - 2157
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (717 KB)

    The evaluation of radar and active sonar matched filter ambiguity functions is critical to waveform choice, the proper selection of reference signals, and the ability to estimate system performance. In the radar case the evaluation is facilitated by use of the narrow-band approximation wherein Doppler distortion of the transmitted modulation function is neglected. However, modern-day sonar signals... View full abstract»

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  • An optical heterodyne ultrasonic image converter

    Publication Year: 1968, Page(s):2157 - 2161
    Cited by:  Papers (30)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB)

    The theory and preliminary experimental results for a new type of ultrasonic image converter system are presented. The method uses a scanning laser transmitter and receiver, operating as an optical heterodyne system, to sense the vibration amplitude distribution on a reflective resonant diaphragm placed in the liquid acoustic medium. The output of the optical heterodyne receiver is displayed as an... View full abstract»

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  • Radar determination of the surface properties of a randomly rough surface

    Publication Year: 1968, Page(s):2163 - 2164
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    This letter conveys a simple method for remote sensing of the surface properties, both physical and geometrical, of a randomly rough surface by means of a polychromatic bistatic radar. Difficulties in evaluating the properties of a randomly rough surface by the conventional method of calculating the scattering cross section or the average power are discussed. View full abstract»

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  • Gunn effect swept frequency oscillator

    Publication Year: 1968, Page(s):2164 - 2165
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (370 KB)

    An X-band swept frequency oscillator using a Gunn diode and a ferrite phase shifter is described. Sweep widths of 800 MHz and sweep rates up to 400 Hz with less than 3 dB power variation have been obtained. View full abstract»

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  • Holographic antennas

    Publication Year: 1968, Page(s):2165 - 2167
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (253 KB)

    Antennas having any mean surface and any prescribed feeder and radiation pattern can be experimentally obtained by the extension of the holographic technique to the microwave field. An experiment is described, based on the simple case of a plane antenna. Different types of microwave holograms, which constitute the synthesized antenna, have been tested. View full abstract»

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  • Statistics of nonstationary shot processes and the fluctuations of detected signals

    Publication Year: 1968, Page(s):2167 - 2168
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    Campbell's theorems on the first and second order moments are extended to shot processes that are generated by Poisson processes of time-varying parameter. The covariance function of the limiting Gaussian process is derived and illustrated by a simple example. View full abstract»

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  • RF triggering of self-sustaining Gunn oscillations

    Publication Year: 1968, Page(s):2168 - 2169
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (353 KB)

    Under suitable loading conditions, the injection of low-power RF signals is able to trigger self-sustaining coherent Gunn oscillations in GaAs samples. Experimentally, RF triggering was achieved by injected signals as weak as 48 dB below the output power. The triggering mechanism is briefly discussed. View full abstract»

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  • A novel method for solving the uniform distributed network analysis problem

    Publication Year: 1968, Page(s):2169 - 2170
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (178 KB)

    An application of the Laplace transform method of Ogata to the solution of the uniform distributed network analysis problem is described. View full abstract»

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  • On some bonds between autocorrelation and power spectra functions

    Publication Year: 1968, Page(s):2170 - 2171
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    Some bonds are established between values of the auto-correlation function of a signal and some parameters of the corresponding power spectrum, and vice versa. These relations are then detailed for band-limited signals, and some expressions for a rough evaluation of the signal bandwidth are deduced. View full abstract»

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  • Suppression of Gunn oscillations by a two-dimensional effect

    Publication Year: 1968, Page(s):2172 - 2173
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (219 KB)

    Suppression of Gunn oscillations in thin-film Gunn diodes by a two-dimensional effect is described theoretically and experimentally. Experiments show that Gunn oscillations do not occur in diodes whose nt product is less than 1.1 × 1011(cm-2), where t is the film thickness. This stabilized sample is useful for amplifiers. View full abstract»

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  • Relationship between electron temperature and population ratio in the Gunn effect

    Publication Year: 1968, Page(s):2173 - 2174
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (214 KB)

    The intervalley transfer in the Gunn effect is investigated from the viewpoint of the total electron number conservation and the scattering balance. Application is made to refine the Gunn domain dynamics model of McCumber and Chynoweth on the basis of Butcher and Fawcett's theory. View full abstract»

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  • Tapered transmission line computer program using Collin's derivation

    Publication Year: 1968, Page(s):2174 - 2175
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Collin's synthesis of the equal ripple transmission line is shown to be computationally identical with Klopfenstein's synthesis. A simple computer program for computing impedance versus length of a tapered line is given, based on Collin's work. View full abstract»

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  • Application of state variable techniques to optimal feature extraction

    Publication Year: 1968, Page(s):2175 - 2176
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (185 KB)

    Optimal continuous linear feature extraction for the binary Gaussian pattern recognition or detection problem necessitates finding the double orthogonal expansion of the observable random process under hypothesis Hi, i = 1, 2. State variable techniques are utilized here to yield efficient computer-implementable procedures for obtaining the double orthogonal expansion. View full abstract»

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  • On crowding effects and failure mechanisms in high power transistor switches

    Publication Year: 1968, Page(s):2176 - 2177
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (177 KB)

    The relationship between current crowding and device failure in the high speed saturating epitaxial transistor switch is discussed. Agreement between theory and practice is demonstrated, using a composite large area device comprising an array of small area transistors. View full abstract»

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  • High-frequency admittance of n-v-n space-charge-limited current (SCLC) solid-state devices

    Publication Year: 1968, Page(s):2178 - 2180
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A calculation has been made of the HF admittance of n-v-n SCLC devices by a simple method that takes into account the thermally generated free carriers in the central bulk region. The assumption made is that the thermal carrier density is relatively small such that the principal dc properties of the SCLC device still prevail. The calculated results indicate that the effect of the thermal free carr... View full abstract»

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  • Stationary coherent (hologram) radar and sonar

    Publication Year: 1968, Page(s):2180 - 2181
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    This letter enlarges on an earlier suggestion that the synthetic aperture of a moving, coherent (side-looking) radar (or sonar) could be replaced by a stationary, "hologram" form of receiving array. View full abstract»

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H. Joel Trussell
North Carolina State University