Bone, DJ 1991, 'Fourier fringe analysis: the two-dimensional phase unwrapping problem', Applied Optics, vol. 30, no. 25, pp. 3627-3627.
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Burnett, IS & Holbeche, RJ 1991, 'The application of the DFT to CELP architectures', IEEE Workshop on Speech Coding for Telecommunications, pp. 83-84.
Esselle, KP & Stuchly, SS 1991, 'A broad-band resistively loaded V-antenna: experimental results', IEEE Transactions on Antennas and Propagation, vol. 39, no. 11, pp. 1587-1591.
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Esselle, KP & Stuchly, SS 1991, 'An electrically large antenna for transient electromagnetic field measurements', IEEE Transactions on Instrumentation and Measurement, vol. 40, no. 2, pp. 460-464.
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Horita, E, Miyanaga, Y & Tochinais, K 1991, 'Characteristic extraction of speech using arma model with double inputs', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 74, no. 3, pp. 67-81.
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AbstractThis paper proposes a method of speech analysis using a new stochastic model. This model represents two different kinds of MA parts associated with pseudo‐periodical pulse train input and Gaussian process input. Therefore, the new model describes individually two different production models for voiced and unvoiced sound in the frequency domain and can precisely realize speech production models in comparison with an ARMA model. It has been shown from experimental results that the proposed stochastic model can extract more accurate characteristics of real speech than an ARMA model.
Houwing, AFP, Boyce, RR, Bone, DJ & Johnston, DK 1991, 'Measurement of recombination rate parameters in nonequilibrium supersonic expansions of ionized argon and neon', Shock Waves, vol. 1, no. 3, pp. 177-185.
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Two wavelength interferometry techniques and a two dimensional Fourier transform analysis are used to produce contour maps of the heavy particle densities and ionization fractions for supersonic corner expansions of ionized argon and neon. A new phase unwrapping algorithm is employed to minimize noise problems previously encountered because of phase discontinuities associated with shock waves and flow luminosity. Determination of recombination rate coefficients is achieved through the measurement of gradients in the ionization fraction. © 1991 Springer-Verlag.
Nakagaki, A, Miyanaga, Y & Tochinai, K 1991, 'A time‐varying parameter estimation of a minimum realization ARMA lattice model', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 74, no. 6, pp. 106-115.
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AbstractThis paper proposes a time‐varying parameter estimation of a minimum realization ARMA lattice model. The model consists of four types of elementary sections. Since each elementary section has only a design parameter after normalization, its characteristics can be represented more compactly. To estimate time‐varying characteristics, several methods with the constant weighting factor have been proposed.This paper shows the limits of the methods using the constant weighting factor and proposes an estimation method with a new variable weighting factor. The new method directly weights observed signals and can arbitrarily change the weighting factor at any time.
Watterson, PA 1991, 'A generalization of the Taylor constraint to the advection of axisymmetric poloidal magnetic fields', Journal of Plasma Physics, vol. 46, no. 2, pp. 255-270.
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The range of ▿ ∧ (u ∧ B) is determined for an axisymmetric poloidal incompressible B and incompressible u, by solving ▿ ∧ (u ∧ B) = ▿ ∧ v for u, assumed to be confined to within a surface of revolution. Two constraints on V are shown to be necessary for the existence of solutions, viz that the integral of rç/|B| must vanish on each flux surface, and that the integral of v1 around any dosed field line must vanish. The construction of the general solution proves that the constraints are sufficient conditions, providing also that the second derivative, with respect to the poloidal flux function, of the volume contained by flux surfaces does not vanish. The general solution is stated for the homogeneous case, v = 0. For the particular case of poloidal v1 an integral property of the solution u is established.
Watterson, PA 1991, 'Analytical solutions for the current driven by a rotating magnetic field in a spherical plasma', Journal of Plasma Physics, vol. 46, no. 2, pp. 271-298.
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The steady currents driven in a spherical plasma by a rotating magnetic field via the Hall effect are studied analytically. The total field is shown to be symmetric across the origin. Integral relationships are obtained between Ohmic dissipation, angular momentum and the oscillating axial current density. The topology of the sum of a Hill's vortex field and a rotating field is documented. Analytical solutions for the driven current are obtained by expansion for the limits corresponding to small rotation frequency, to small number density, to large rotating-field magnitude, to small resistivity, and to small rotating-field magnitude combined with very small resistivity. The latter solution, relevant to the reactor limit, indicates that, with control of the vertical field magnitude, an MHD equilibrium can be generated with total current any fraction of the currentcorresponding to synchronous rotation of the electrons. Oscillating currents sufficient to drive the synchronous current are determined.
Yokoyama, Y, Miyanaga, Y & Tochinai, K 1991, 'Automatic design of a parallel/pipelined VLSI architecture for signal processing', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 74, no. 11, pp. 39-48.
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AbstractThis paper discusses the system for automatic design of the parallel/pipelined VLSI architecture based on the signal processing algorithm. A new design language is introduced into the proposed system. The language is defined so that the time variable used in the signal processing algorithm can easily be described. The system has a high modularity, and the modules can be combined into a hierarchical structure. By this scheme, the algorithm with a high complexity can easily be described.The algorithm inputted to the system may contain a backward time‐flow of the delayed data as well as a complex hierarchical structure, which makes it difficult to execute the data‐flow graph obtained directly from the algorithm by the parallel/pipelined structure.From such a viewpoint, this paper adopts the following procedure. The data‐flow graph is derived from the given algorithm. A sufficient parallelism and a highly efficient pipelined mechanism are extracted from the obtained graph. Then the parallel processing architecture is designed. As an example, a parallel/pipelined architecture is designed for a simple adaptive signal processing algorithm. The result is compared with the traditional design examples, and it is shown that the efficient data‐flow architecture is derived.
Esselle, KP & Stuchly, M 1970, 'Analysis Of Neural Stimulation With Magnetically Induced Fields', Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society Volume 13: 1991, Annual International Conference of the IEEE Engineering in Medicine and Biology Society Volume 13: 1991, IEEE, ORLANDO, FL, pp. 845-846.
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Guo, YJ, Barton, SK & Wright, TMB 1970, 'Design of high efficiency Fresnel zone plate antennas', AP-S International Symposium (Digest) (IEEE Antennas and Propagation Society), pp. 182-185.
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With a family of ideal radiation patterns, the theory for designing high-efficiency phase-correcting FZP (Fresnel zone plate) antennas is presented. The optimum 3-dB beamwidth of the feed pattern as a function of F/D (focal length/diameter) of the plate, the relation between the phase efficiency of the antenna and the number of subzones used in each full-wave zone, and the total efficiency limits of various versions are given. It is found that the maximum efficiency of a practical FZP antenna is usually less than 70%. The theory has been employed in designing a four-layer experimental FZP reflector antenna, and good agreement between the theoretical expectation and the measured value is obtained.
LI, SY, ZHANG, YM & SU, WD 1970, 'INTELLIGENT SAMPLING FUZZY DECOUPLING CONTROL OF AN ARC-WELDING ROBOT', INFORMATION AND SYSTEMS, VOLS 1-3, INTERNATIONAL CONF ON INFORMATION AND SYSTEMS, INT ACADEMIC PUBL, ASSOC MODELLING & SIMULAT ENTERPRISES, HANGZHOU, PEOPLES R CHINA, pp. 333-336.
Miyanaga, Y, Teraoka, M & Tochinai, K 1970, 'Parallel and adaptive clustering method suitable for a VLSI system', 1991 IEEE International Symposium on Circuits and Systems (ISCAS), 1991 IEEE International Symposium on Circuits and Systems (ISCAS), IEEE.
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