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1992 Vol. 14, No. 4
Display Method:
1992, 14(4): 337-343.
Abstract:
The application of extraction principle for logic function minimization to multiple-output cases is studied. The defect in original algorithm in dealing with multi-output extremals is complemented, and three kinds of less-than terms in different cond...
The application of extraction principle for logic function minimization to multiple-output cases is studied. The defect in original algorithm in dealing with multi-output extremals is complemented, and three kinds of less-than terms in different cond...
1992, 14(4): 344-353.
Abstract:
The multi-tone interferences suppression in HF serial data transmission systems is analysed. Analytic expressions for the tap weights and minimum mean square errors of adaptive equalizer in HF serial systems are obtained. The rate of convergence of e...
The multi-tone interferences suppression in HF serial data transmission systems is analysed. Analytic expressions for the tap weights and minimum mean square errors of adaptive equalizer in HF serial systems are obtained. The rate of convergence of e...
1992, 14(4): 354-360.
Abstract:
Based on analysis of non-linear channel models, a new connectionist model adaptive equalizer is constructed. Comparing with the connectionist model using the Volterra series to extend the input vector space, the number of weights with new structure i...
Based on analysis of non-linear channel models, a new connectionist model adaptive equalizer is constructed. Comparing with the connectionist model using the Volterra series to extend the input vector space, the number of weights with new structure i...
1992, 14(4): 361-370.
Abstract:
A general approach to analysis of class E tuned power amplifier with anti-parallel diode at switch is presented. First, the determination of diode active angle is discussed. Then the amplifier output response, along with performance evaluation, is de...
A general approach to analysis of class E tuned power amplifier with anti-parallel diode at switch is presented. First, the determination of diode active angle is discussed. Then the amplifier output response, along with performance evaluation, is de...
1992, 14(4): 371-378.
Abstract:
A new method to reconstruct multiple-layered medium is first proposedby using a time-domain signal-flow graph (TDSFG) technique. With the equivalent network of the medium, a concept of TDSFG is given, and its rules are derived. Furthermore, the refle...
A new method to reconstruct multiple-layered medium is first proposedby using a time-domain signal-flow graph (TDSFG) technique. With the equivalent network of the medium, a concept of TDSFG is given, and its rules are derived. Furthermore, the refle...
1992, 14(4): 379-384.
Abstract:
A new method-L calibration technique for calibrating the duali-six-port network analyzer is proposed. Usinf this method a section of transmission line is needed only, and its length is not necessary to be known accurately. The measuring errors introd...
A new method-L calibration technique for calibrating the duali-six-port network analyzer is proposed. Usinf this method a section of transmission line is needed only, and its length is not necessary to be known accurately. The measuring errors introd...
1992, 14(4): 385-389.
Abstract:
The working properties of a circular free electron laser with an intenserelarivistic nonneutral electron ring have been investigated with in the framework of the Vla-sov-Maxwell equations. The results show that the space charge of intense electron be...
The working properties of a circular free electron laser with an intenserelarivistic nonneutral electron ring have been investigated with in the framework of the Vla-sov-Maxwell equations. The results show that the space charge of intense electron be...
1992, 14(4): 390-395.
Abstract:
The problems of EM energy absorption of human body irradiated by plane wave are discussed by using the Finite-Difference Time-Domain (FD-TD) method. The local SAR (Specific Absorption Rare), the whole-body-averaged SAR and the layer-averaged SAR for ...
The problems of EM energy absorption of human body irradiated by plane wave are discussed by using the Finite-Difference Time-Domain (FD-TD) method. The local SAR (Specific Absorption Rare), the whole-body-averaged SAR and the layer-averaged SAR for ...
1992, 14(4): 396-403.
Abstract:
The high-order finite-element method is used for analyzing the characteristic impedances of the coaxial lines with arbitrary cross-sectons. A standard program with second order element analysis for calculating the characteristic impedances of various...
The high-order finite-element method is used for analyzing the characteristic impedances of the coaxial lines with arbitrary cross-sectons. A standard program with second order element analysis for calculating the characteristic impedances of various...
1992, 14(4): 404-408.
Abstract:
The characteristics of the phase centers of electromagnetic horns holdingnearly symmetric pattern are presented analytically. It is proved that the phase center on the = 45 plane coincides with the average phase center, and if a single plane phase ce...
The characteristics of the phase centers of electromagnetic horns holdingnearly symmetric pattern are presented analytically. It is proved that the phase center on the = 45 plane coincides with the average phase center, and if a single plane phase ce...
1992, 14(4): 409-415.
Abstract:
Two different types of oscillations observed in S-band 20 MW high power klystron and S-band 1.5 MW broadband klystron are described in detail. Experiments and theoretical analysis show that one type of oscillation is diode oscillation happened in the...
Two different types of oscillations observed in S-band 20 MW high power klystron and S-band 1.5 MW broadband klystron are described in detail. Experiments and theoretical analysis show that one type of oscillation is diode oscillation happened in the...
1992, 14(4): 416-419.
Abstract:
Based on the theory of stochestic differential equation, the stability of a kind of generalized continuous-time Hopfield neural network with white noise perturbation is studied, and the related stability criteria and design requirements of neural net...
Based on the theory of stochestic differential equation, the stability of a kind of generalized continuous-time Hopfield neural network with white noise perturbation is studied, and the related stability criteria and design requirements of neural net...
1992, 14(4): 420-423.
Abstract:
An improved algorithm which is based on the recursive closed-form algorithm for non-minimum phase FIR system identification via higher order statistics is presented. In order to increase the parameter estimation accuracy, the improved algorithm uses ...
An improved algorithm which is based on the recursive closed-form algorithm for non-minimum phase FIR system identification via higher order statistics is presented. In order to increase the parameter estimation accuracy, the improved algorithm uses ...
1992, 14(4): 424-427.
Abstract:
Otsu s method (1979) is considered as a good thresholding method for image segmentation. In this paper, an efficient c-mean calustring algorithm which is suitable for image segmentation is proposed. It yields th came results as Otsu s method, but its...
Otsu s method (1979) is considered as a good thresholding method for image segmentation. In this paper, an efficient c-mean calustring algorithm which is suitable for image segmentation is proposed. It yields th came results as Otsu s method, but its...
1992, 14(4): 428-431.
Abstract:
A practical electronic structural modelling system is presented. This system can be used to study the distribution of intermolecular microscopic properties, such as electron densities and intermolecular potentials. It includes calculation and represe...
A practical electronic structural modelling system is presented. This system can be used to study the distribution of intermolecular microscopic properties, such as electron densities and intermolecular potentials. It includes calculation and represe...
1992, 14(4): 432-435.
Abstract:
An accurate formula is derived for cutoff values of TE modes in the symmetric slab optical waveguide with a nonlinear thin film. Two examples are given. Computed results are in agreement with exact results in literatures.
An accurate formula is derived for cutoff values of TE modes in the symmetric slab optical waveguide with a nonlinear thin film. Two examples are given. Computed results are in agreement with exact results in literatures.
1992, 14(4): 436-440.
Abstract:
As an important aspect of partial differential equation solutions of open-region electromagnetic field problems, the concept and algorithm of guided-wave global numerical boundary conditions are presented. Emphasis is placed on the two-dimensional gu...
As an important aspect of partial differential equation solutions of open-region electromagnetic field problems, the concept and algorithm of guided-wave global numerical boundary conditions are presented. Emphasis is placed on the two-dimensional gu...
1992, 14(4): 441-444.
Abstract:
The dependence of input impedance of a dipole element on the current distribution is studied, and a method for synthesizing a given radiation pattern from a new type of array of unequal dipoles is described. The input impedances of the elements are e...
The dependence of input impedance of a dipole element on the current distribution is studied, and a method for synthesizing a given radiation pattern from a new type of array of unequal dipoles is described. The input impedances of the elements are e...
1992, 14(4): 445-448.
Abstract:
By the aid of the phase shift-frequency characteristic, the conformal transformation and the perturbation theory, a new kind of compact, broadband waveguide phase shifter is developed. It is used in the satellite earth station and achieves very nice ...
By the aid of the phase shift-frequency characteristic, the conformal transformation and the perturbation theory, a new kind of compact, broadband waveguide phase shifter is developed. It is used in the satellite earth station and achieves very nice ...
