最新刊期
卷 ， 期 7 ， 1993
- 摘要：According to the principle of escaping from local optimal solutions of simulated annealing algorithm,a new neural computing method for optimization is proposed based on Hopfield neural network method.By adjusting the connection weights of a neural network,the network can not only escape from local optimal solutions of objective functions,but also improve local optimal solutions of objective functions.Experimental results show that the new method requires much less computing time to obtain an optimal solution than simulated annealing algorithm does.关键词：neural network;optimization;simulated annealing algorithm2|222|1更新时间：2025-12-08
- 摘要：The recognition of planar polygons has many important applications in computer vision.We derive a group of perspective projection invariants of five general coplane lines and present the concept of perspective equivalent planar polygons （PEPP） in this paper.The invariants and the properties of PEPP may be used to recognize planar polygons.The recognition results are independent of the view points of camera,and more stable in the presence of noises than that of other methods.The experiments have proved the effectiveness of the invariants.关键词：Geometrical invariance;Recognition of planar polygons;Perspective equivalentplanar polygon;Perspective projection2|193|4更新时间：2025-12-08
- 摘要：A definite relation between the TSP’S optimal solution and the attracting region in the parameter space of TSP’S energy function is discovered.Many attracting regions corresponding with the global aptimal solution for TSP are also found.Then a neural network algorithm with the optimized parameters by using orthogoral array table is proposed and used to solve the Travelling Salesman Problem （TSP） for 30,31 and 300 cities.It is shown that the new algorithm is effective.关键词：Hopfield neural network model;TSP;Parameter space;Attracting region;Orthogonal array table method2|105|2更新时间：2025-12-08
- 摘要：This paper gives a method of balanced coding for discrete memoryless sources such that the output sequence of the source has best balance,i.e.,the probabilities of the appearance of 0 and 1 are almost the same.For fixed-length coding,the method proposed in this paper is step-optimum.For balanced coding based on Huffman’s code,by keeping the same average code word length,the method in this paper is optimum.Moreover,the application of balanced coding in stream Ciphers is also discussed.关键词：Balanced source coding;stream cipher;Divide and conquer attack2|39|1更新时间：2025-12-08
- 摘要：In this paper,the security of Niederreiter’s public-key algebraic-code crypto-system is analysed,a new attack method of solving linear equations is given which is sucta-ble for attacking the Niederreiter’s cryptosystem,and the fact that the Niederreiter’s crypto-system has the same security as the McEliece’s cryptosystem is exposed.Finally,by optimization of the parameters in the two cryptosystems which guarantee the security,the parameter range and the property comparisons between the two cryptosystems are also given.关键词：Niederreiter密码体制,McEliece密码体制;代数编码理论;安全性2|82|6更新时间：2025-12-08
- 摘要：The image damage by transform coefficients quantization in ID-DCT transform compression coding is analysed on frequency domain and space domain.Some useful results are obtained.It provides scientific basis for word-length determination in real-time hardware implementation of ID-DCT image coding by wordlength analysis of transform matrix coefficient and computer similation.The results of hardware test confirm the conclusions from this analysis.关键词：Image coding;Wordlength effect2|60|0更新时间：2025-12-08
- 摘要：Based on the model reduction of internally balanced structure,an approximation method of stable linear phase IIR digital filters is obtained by means of reducing the orders.This theory is verified by computer simulation results.关键词：IIR digital filters;linear phase;approximation;Internally balanced structure model reduction;coefficient sensitivity2|190|1更新时间：2025-12-08
- 摘要：A symbolic algorithm and a graphical method are presented for analyzing sub-harmonic oscillations in nonlinear high-order systems.The two approaches are appliable to the systems with a nonlinear function f（x）=ax-bx3.The graphical method is useful for analyzing the systems with a five-order polynomial nonlinearity and for obtaining the multiple solutions of a nonlinear system.An example with six solutions is also given.关键词：谐波振荡;非线性系统;符号算法;图解法;多解2|75|1更新时间：2025-12-08
- 摘要：As a generalization of papers [2,3],a stochasic momemtum factor LMS （SMLMS） algorithm is proposed in this paper.The SMLMS algorithm changes the constant momentum factor of conventional MLMS algorithm to a stochastic attenuation variable so as to provide a smaller misadjustment and a better error bursting compensation for adaptive filter.关键词：Stochastic momentum factor;adaptive filtering;Misadjustment2|41|1更新时间：2025-12-08
- 摘要：This paper,combining the solution of received signals covariance matrix with adaptive blind equalization algorithm,presents a new algorithm of blind equalization on time-variant channels.Computer simulation results have shown that the convergence rate of blind equalization can be greatly improved with this method,and the equalizer can be set up within 200300 symbols when it becomes divergent on the time-variat channels.关键词：相关矩阵;自适应均衡;盲均衡2|132|7更新时间：2025-12-08
- 摘要：This paper gives some research on the priority control of traffics in the broadband integrated services digital network （BISDN） which is based on ATM,and two kinds of method to achieve the priority control are proposed.关键词：Broadband integrated services digital network （BISDN）;Switehing2|21|1更新时间：2025-12-08
- 摘要：In order to solve the contradiction between the rapid bit-synchronization and the filtering of the phase noise,a LL-DPLL changing order automatically with high speed and high precision is put forward.The discussion focuses on the theoretical analyses and the relevant results are also given.关键词：LL-DPLL;Time-division muhiplex/muhple address;Bit-synchronization2|168|3更新时间：2025-12-08
- 摘要：The state of art of the theory and application of wavelet transforms is reviewed.The frontiers and related problems on wavelet transforms are discussed too.关键词：Wavelet series;wavelet transform;Fourier analysis2|199|28更新时间：2025-12-08
- 摘要：As a part of the author’s series study on the constant weight codes,we have initially found the structure properties and the equivalent classes for the unextendable binary codes of constant weight and distance with parameters （n,2,m） and （n,4,m） in this paper.A few open problems about the structure of （n,2k,m） codes with constant weight and distance for k≥3 are also proposed关键词：Constant weight codes;Constant distance codes;error-correcting codes;Permutations2|29|3更新时间：2025-12-08
- 摘要：A new method of radar waveform design and signal processing,which replace:the long code with frequency diversity shorter codes,is investigated to improve the Doppler tolerance and near-range sounding of biphase coded signals with large compression ratio.In addition,noncoherent integration and weighted processing are introduced separately to furtherly raise the peak ratio of mainlobe to sidelobe （RMS） of frequency diversity signals.At The compression ratio of 190,waveform design and signal processing hardware experiment are given.关键词：radar;Biphase coding;waveform design;Frequeney diversity2|112|0更新时间：2025-12-08
- 摘要：The predictor:x0=1/2x1+1/4（x3’+x4’）,for the coding of television pictures （interlaced）,is also suitable lor the coding of original data of multi-spectral scanner （MSS） satellite remote sensing pictures （non-interlaced）.By using such a predictor and simple entropy coding （As code）,the lossless coding/decoding is realized on two kinds of computers by softwares for typical MSS pictures,with compression ratio slightly greater than two.This paper is a brief report of a project and related works following it,wh le the proposed algorithm is very similar to the corresponding one proposed by JPEG.关键词：Picture coding;Lossless coding of remote sensing pictures2|48|1更新时间：2025-12-08
- 摘要：A kind of binary sequences called E sequences is discussed.Based on their combinatorial properties,E sequences are divided into "pack","group" and "class".It is proved that when their lengths are longer than or as long as 8,E sequences belonging to the same "class" can not be identical.Finally a brief,fast and effective algorithm for synthesizing E sequences,especially a large number of long E sequences,is derived.关键词：Binary sequence;E sequence;algorithm2|10|0更新时间：2025-12-08
- 摘要：An active antenna consisting of electrically small antennas and a negative impedance changing circuit is analyzed in this paper.The stable operating condition of the active antenna is also given.The analysis shows that the active antenna designed with this method has higher sensibility and optimum small size.The experimental confirmation showa that this method is correct.关键词：antenna;active antenna;Negativa impedance changing;stability2|393|2更新时间：2025-12-08
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