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1997 Vol. 19, No. 1
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1997, 19(1): 1-5.
Abstract:
Image segmentation is a critical step of image analysis. Segmentation evaluation is an effective procedure for studying the performance of segmentation techniques, in which quality measure plays an important role. This paper presents a group of new o...
Image segmentation is a critical step of image analysis. Segmentation evaluation is an effective procedure for studying the performance of segmentation techniques, in which quality measure plays an important role. This paper presents a group of new o...
1997, 19(1): 6-10.
Abstract:
The characteristics of 2-D convolutions with big kernel in low-rank are analysed, and a fast algorithm is given. Then a systolic array implementation, which is derived by a three-stage dependence-graph-based mapping approach, is presented. It is show...
The characteristics of 2-D convolutions with big kernel in low-rank are analysed, and a fast algorithm is given. Then a systolic array implementation, which is derived by a three-stage dependence-graph-based mapping approach, is presented. It is show...
1997, 19(1): 11-16.
Abstract:
By comparison with constraint satisfaction networks, this paper presents an essential frame of the logical theory for continuous-state neural networks, and gives the quantitative analyzing method for contradiction. The analysis indicates that the bas...
By comparison with constraint satisfaction networks, this paper presents an essential frame of the logical theory for continuous-state neural networks, and gives the quantitative analyzing method for contradiction. The analysis indicates that the bas...
1997, 19(1): 17-23.
Abstract:
The paper presents a total parallell neural network for real-tune computation of SVD. Its boundedness and stability of the dynamical system are studied. Computer simulation is also given. The results of the theoretical analysis and simulation illusta...
The paper presents a total parallell neural network for real-tune computation of SVD. Its boundedness and stability of the dynamical system are studied. Computer simulation is also given. The results of the theoretical analysis and simulation illusta...
1997, 19(1): 24-30.
Abstract:
The data assciation problem is one of the key problems of multitarget tracking in dense multiple return environments. By constructing a suitable energy function, the average values of a Boltzmann machine (T = 1) are approximately equal to the associa...
The data assciation problem is one of the key problems of multitarget tracking in dense multiple return environments. By constructing a suitable energy function, the average values of a Boltzmann machine (T = 1) are approximately equal to the associa...
1997, 19(1): 31-36.
Abstract:
The paper proposes an estimation method of blocking in multistage interconnection networks serving multirate traffics. It can be used in multirate curcuit swithcing and ATM switching systems. In the paper, an analysis of blocking is given. The accura...
The paper proposes an estimation method of blocking in multistage interconnection networks serving multirate traffics. It can be used in multirate curcuit swithcing and ATM switching systems. In the paper, an analysis of blocking is given. The accura...
1997, 19(1): 37-43.
Abstract:
In ATM networks, bursty sources can be described as the Interrupted Bernoulli Pro-cess(IBP). With the use of the thin process theory, the Probability Generating Function(PGF) of the IBP is obtained. An iterative algorithm, which can be used to calcul...
In ATM networks, bursty sources can be described as the Interrupted Bernoulli Pro-cess(IBP). With the use of the thin process theory, the Probability Generating Function(PGF) of the IBP is obtained. An iterative algorithm, which can be used to calcul...
1997, 19(1): 44-49.
Abstract:
This paper analyzes a queue model of the polling system with limited service (K = 1) in discrete time. By the imbedded Markov chain theory and the generating function method, the mean values of queue length and message waiting time are explicitly obt...
This paper analyzes a queue model of the polling system with limited service (K = 1) in discrete time. By the imbedded Markov chain theory and the generating function method, the mean values of queue length and message waiting time are explicitly obt...
1997, 19(1): 50-55.
Abstract:
This paper presents a real-time implementation of 4.2Kb/s CELP speech coding on single DSP. An algorithm reducing search complexity for adaptive codebook is suggested, the solving method, which changes a parameter into LSP parameter, is discussed. Th...
This paper presents a real-time implementation of 4.2Kb/s CELP speech coding on single DSP. An algorithm reducing search complexity for adaptive codebook is suggested, the solving method, which changes a parameter into LSP parameter, is discussed. Th...
1997, 19(1): 56-60.
Abstract:
This paper presents lower bounds and upper bounds for the mean value and variance of distance distribution of non-linear codes in GF(q). By presenting several examples, it is shown that these bounds could be achieved.
This paper presents lower bounds and upper bounds for the mean value and variance of distance distribution of non-linear codes in GF(q). By presenting several examples, it is shown that these bounds could be achieved.
1997, 19(1): 61-67.
Abstract:
In order to resist the anti-radar missiles, this paper presents a method for designing a group-complementary phase-coded signal set in which each signal has a characteristic of low probability intercept and is orthogonal to other signal. Meanwhile, o...
In order to resist the anti-radar missiles, this paper presents a method for designing a group-complementary phase-coded signal set in which each signal has a characteristic of low probability intercept and is orthogonal to other signal. Meanwhile, o...
1997, 19(1): 68-71.
Abstract:
This paper presents a novel technique for directly IF sampling and digitally obtaining the inphase (I) and quadrature (Q) components of the IF signal. Because all subsequent processing and detection are accomplished in the digital domain, it can prov...
This paper presents a novel technique for directly IF sampling and digitally obtaining the inphase (I) and quadrature (Q) components of the IF signal. Because all subsequent processing and detection are accomplished in the digital domain, it can prov...
1997, 19(1): 72-76.
Abstract:
The characteristics method is introduced to analyze the transient sensitivity of transimission lines in high-speed VLSI circuits with respect to the transmission line parameters or terminal parameters, supplying a useful tool for the optimization des...
The characteristics method is introduced to analyze the transient sensitivity of transimission lines in high-speed VLSI circuits with respect to the transmission line parameters or terminal parameters, supplying a useful tool for the optimization des...
1997, 19(1): 77-82.
Abstract:
Factor analysis method is firstly used to establish 5 parameter statistical model of microwave FETs. This statistical model is compared with the one established by principal component analysis method. The results show that the statistical model by fa...
Factor analysis method is firstly used to establish 5 parameter statistical model of microwave FETs. This statistical model is compared with the one established by principal component analysis method. The results show that the statistical model by fa...
1997, 19(1): 83-89.
Abstract:
This paper presents the analysis of open microstrip structures by using diakoptic method of lines combined with periodic boundary conditions (PBC). The parameters of microstrip patch are obtained from patch current excited by plane wave. Impedance ma...
This paper presents the analysis of open microstrip structures by using diakoptic method of lines combined with periodic boundary conditions (PBC). The parameters of microstrip patch are obtained from patch current excited by plane wave. Impedance ma...
1997, 19(1): 90-96.
Abstract:
Based on the method of separating variables and Muller s calculating roots, the propagation characteristics of hybrid modes in homogeneous and inhomogeneous circular Faraday chi-rowaveguides are examined in detail. Numerical results are presented to ...
Based on the method of separating variables and Muller s calculating roots, the propagation characteristics of hybrid modes in homogeneous and inhomogeneous circular Faraday chi-rowaveguides are examined in detail. Numerical results are presented to ...
1997, 19(1): 97-104.
Abstract:
The virtual ray method for treating HF electromagnetic scattering problems is derived from the plane wave of free space, by use of which the plane wave scattering by an impedance wedge is studied. In the treatment the concept of generalized circle is...
The virtual ray method for treating HF electromagnetic scattering problems is derived from the plane wave of free space, by use of which the plane wave scattering by an impedance wedge is studied. In the treatment the concept of generalized circle is...
A STUDY ON DIRECT EM SCATTERING OF 2-DIMENSIONAL INHOMOGENEITIES BURIED IN A LOOSY STRATIFIED MEDIUM
1997, 19(1): 105-111.
Abstract:
Direct TM-Scattering problem of two-dimensional inhomogeneities buried in a loosy stratified medium is presented. Analysis work mainly consists of two parts: one is to derivate the Green s function of a filament buried in a loosy stratified medium, a...
Direct TM-Scattering problem of two-dimensional inhomogeneities buried in a loosy stratified medium is presented. Analysis work mainly consists of two parts: one is to derivate the Green s function of a filament buried in a loosy stratified medium, a...
1997, 19(1): 112-115.
Abstract:
This paper addresses the effect of nonlinearity of RCAM on its recall performance with the help of signal-to-noise analysis and presents a new nonlinear function. Theoretical analysis and computer simulations show that the presented memory model offe...
This paper addresses the effect of nonlinearity of RCAM on its recall performance with the help of signal-to-noise analysis and presents a new nonlinear function. Theoretical analysis and computer simulations show that the presented memory model offe...
1997, 19(1): 116-119.
Abstract:
An image processing system under MS-Windows environment has been developed on micro-computer in order to facilitate the data analyzing of all-sky auroral image recorded in polar region. The system has realized: information extraction of aurora s shap...
An image processing system under MS-Windows environment has been developed on micro-computer in order to facilitate the data analyzing of all-sky auroral image recorded in polar region. The system has realized: information extraction of aurora s shap...
1997, 19(1): 120-123.
Abstract:
The principles, properties of Hilbert transform and wavelet transform and their applications to extracting signal envelope are discussed respectively. Some comparisons are made to illustrate that modulated Gaussian wavelet transform not only can orth...
The principles, properties of Hilbert transform and wavelet transform and their applications to extracting signal envelope are discussed respectively. Some comparisons are made to illustrate that modulated Gaussian wavelet transform not only can orth...
1997, 19(1): 124-127.
Abstract:
This paper presents an Azimuth Multi-look Processor (AMP). It is a major part of airborne Synthetic Aperture Radar (SAR) real-time digital image processor. And its concurrent and real-time processing abilities are discussed. A feasible configuration ...
This paper presents an Azimuth Multi-look Processor (AMP). It is a major part of airborne Synthetic Aperture Radar (SAR) real-time digital image processor. And its concurrent and real-time processing abilities are discussed. A feasible configuration ...
1997, 19(1): 128-131.
Abstract:
This paper presents an idea for the average brightness temperature of antenna aperture and its expression for a lossless antenna with matched and unmatched noise sources. The expressions show that the average brightness temperature of antenna apertur...
This paper presents an idea for the average brightness temperature of antenna aperture and its expression for a lossless antenna with matched and unmatched noise sources. The expressions show that the average brightness temperature of antenna apertur...
1997, 19(1): 132-136.
Abstract:
By analyzing the scattered fields from zone plate reflectors, the focal field distributions of Presnel zone plate antenna are investigated in the view of receiving antenna analysis.
By analyzing the scattered fields from zone plate reflectors, the focal field distributions of Presnel zone plate antenna are investigated in the view of receiving antenna analysis.
1997, 19(1): 137-140.
Abstract:
A high accuracy stable Dispersive Boundary Condition(DBC) is presented, which can be used to model wave propagation in transmission lines by the finite-difference time-domain method. The differential factor in the boundary condition is replaced by a ...
A high accuracy stable Dispersive Boundary Condition(DBC) is presented, which can be used to model wave propagation in transmission lines by the finite-difference time-domain method. The differential factor in the boundary condition is replaced by a ...
1997, 19(1): 141-144.
Abstract:
A new method for analysing SOI (Silicon on Insulator) Sructure Mach-Zehnder interferometric modulator by using finite element method is put forward. On the basis of the theory of the single-mode SOI rib optical waveguides with large cross-section, th...
A new method for analysing SOI (Silicon on Insulator) Sructure Mach-Zehnder interferometric modulator by using finite element method is put forward. On the basis of the theory of the single-mode SOI rib optical waveguides with large cross-section, th...
