最新刊期
卷 ， 期 5 ， 1999
- 摘要：Adaptable architecture is required for rapidly increasing density of hardware.Based on VLSI,MTPS（Multiple T -Pipelines） architecture is built by coupling multiple T -Pipelines together.This architecture is divided into two stages instruction preparation and execution.By such hierarchy,more parallelisms among threads and within thread are exploited.Analysis to MTPS indicats that both the utility of execution units and the pipeline efficiency are increased.关键词：VLSI;Multithread;pipeline;Parallism2|33|1更新时间：2025-12-08
- 摘要：An analysis of dynamics of synergetic approach on pattern recognition based on unbalanced attention parameters is presented.The distribution of stable equilibria is proved while the properties of attention parameters are studied,which will guide research on recognition problems with partial selectivity.关键词：Synergetics;Synergetic approach on pattern recognition;Dynamical system;attention parameters;Potential function2|111|23更新时间：2025-12-08
- 摘要：A new method to determine the minority carrier lifetime and the surface generation velocity simultaneously,called transient capacitance relaxation spectral analysis method,is proposed in this paper.Using this method,the minority carrier lifetime and the surface generation velocity can be obtained simultaneously,accurately and solely from the position and the height of the spectral peak.Meanwhile we compare the results from this method with those from Zerbst method.关键词：Minority carrier lifetime;Surface generation velocity;Transient capacitance;Relaxation spectrum2|46|0更新时间：2025-12-08
- 摘要：This paper presents a synthesis of synchronous dynamic sequential circuits （SDSC） in which capacitor is used as memory element instead of flip flop for double edge trigger.On the basis of theory of three essential circuits elements （signal,network and load）,the edge sampling theorem is derived first,then a Karnaugh map method is developed from gate stage into element stage and finally the state assignment principle for CDSC is presented,so that an efficient synthetic procedure of SDSC is formed.By the use of the synthetic procedures,we have designed some SDSC which structures are very simplified,such as that the error code detecting circuits consists of only 22 MOS transistors and 8421BCD 10 counter consists of only 31 MOS tramsisters.关键词：Synchranous dynamic sequential circuits;Edge sampling theorem;Karnaugh map method;State assignment2|59|7更新时间：2025-12-08
- 摘要：This paper presents a learning algorithm of Haken neural network by adding feedback mechanism to Haken’s learning algorithm.This algorithm trains the weight matrix repeatedly.It enables the neural network to recognize image more effectively,and enlarges the capacity of the network.关键词：Synergetics;Synergetic neural network;Synergetic learning algorithm2|155|22更新时间：2025-12-08
- 摘要：According to the features of object oriented database and cyclic query,based on the ODMG 93 standard,a general practical cyclic query processing strategy is proposed.Based on the asynchronous parallel query processing strategy,the cyclic query parallel processing strategy is also proposed.关键词：Object oriented database;Cyclic query;Cyclic component;parallel processing2|48|4更新时间：2025-12-08
- 摘要：In this paper,the reconstruction of cylinders with complex media is investigated.The forward scattering problem is first analyzed by using the FD MEI（Finite Difference Measured Equation of Invariance） method,then the objective function is constructed in terms of the difference between the computed scattering fields and the measured fields,and finally the objective function is minimized based on the conjugate gradient method and variable metric method.The solution results in the reconstruction of the media of the cylinder.In the optimization procedure,the gradient of the objective function is rigorously derived.Several reconstruction examples are presented,where the reconstruction of a conducting cylinder is based on the measured Ipswich.关键词：inverse problem;electromagnetic scattering;Finite difference method;imaging2|67|3更新时间：2025-12-08
- 摘要：Symmetry is widely spread in man made objects and objects in nature.Fast and effective symmetry detection is still a difficult problem in computer vision.In this paper,we convert the symmetry detection problem to a Principal Component Analysis （PCA） problem.And six theorems and four corollaries about PCA problem are given and proved.They tell us the conditions symmetry images satisfy.Following the instructions by the theorems and the corollaries,we design an algorithm to find symmetry axles.Experimental results show that the algorithm we given is fast and robustness.关键词：PCA;Mirror symmetry;Rotational symmetry;Eigenvalue decomposition2|388|40更新时间：2025-12-08
- 摘要：In packet switched communication networks,traffics between any source destination（SD） pair are expected to be transmitted over multiple paths.In this paper,we focus on the problem how to optimally distribute the load on a set of alternative paths so that the average time delay of a packet can be minimized.Since real time processing of this problem is needed in most cases,we propose a neural network method to solve it.Experiments on a typical communication network demonstrate that the result obtained using our method is better than the best result yielded by other rigorous mathematical algorithms.关键词：neural networks;Traffic dispersion;Nonlinear programming problem;Packet switched networks2|25|1更新时间：2025-12-08
- 摘要：Several classes of authentication codes with the lowest probabilities of successful impersonation and substitution attack and the smallest encoding rules are constructed,and also authentication code with the lowest probabilities of successfully impersonation and substitution attack and the smallest encoding rules and the largest source states is constructed by elementary methods.A new modified method of restructuring Cartesian authentication codes into perfect secret authentication code is given and the quantity of encoding rules of the modified scheme is the same as original scheme.关键词：Cartesian authentication codes;Secret authentication codes;Encoding rules2|59|6更新时间：2025-12-08
- 摘要：The situation of non uniform material may often appear when we extract VLSI layout parameters using Boundary Element Method （BEM）.It is difficult to deal with this problem by using traditional region division method of BEM.Particularly if there is lot of material in the region concerned,the advantages of BEM such as simplicity,convenience and rapidity will be weakened.In this paper the authors present a distributed algorithm for region division problem of BEM.The algorithm is implemented in a distributed system consisting of 3 Workstations to extract VLSI layout parameters.The results obtained show that the calculating time of this distributed algorithm is less than that of traditional methods.This demonstrates that the algorithm can speed up the calculation and is characterized by parallel operation and high efficiency.关键词：Layout parameter extraction;boundary element method;Non uniform material;distributed algorithm2|62|4更新时间：2025-12-08
- 摘要：Because the gain spectrum of an Erbium doped fiber amplifier （EDFA） varies with the saturation level,an iterative method of measurement on multichannel gain spectrum under equivalent saturation by using dual wavelength or broadband signal is introduced and the power of the equivalent saturation signal is derived.Only several iterations are required to reach enough accuracy.The error of the experiment is no greater than 0.15 dB.关键词：Erbium doped fiber amplifier （EDFA）;Wavelength division multiplexing （WDM）;Gain spectrum;Measurement2|56|1更新时间：2025-12-08
- 摘要：This paper applies mathematical methods to analyse end to end traffic volumes in the telecommunication networks with K types services under the condition of natural failures.A theoretical algorithm to calculate end to end traffic volume is presented under the supposition of applying sequential routine.Using the algorithm can get the upper value of end to end traffic volume.关键词：Telecommunication network;reliability;End to end traffic volume;algorithm2|45|1更新时间：2025-12-08
- 摘要：In all available defect outline models used for yield prediction and inductive fault analysis of integrated circuits （IC）,real rugged outlines are usually replaced with circular discs or squares.Based on the idea of piecewise linear interpolation,this paper presents a new model to characterize those real defect outlines.The comparison of the new model with those models available indicates that the new model is a more accurate defect outline model.关键词：IC defect model;Piecewise linear interpolation;IC fault probability;IC yield2|63|9更新时间：2025-12-08
- 摘要：本文分析并给出了在无应力及界面态的理想条件下ｎｐｎＳｉ１－ｙＧｅｙ基区ＨＢＴ集电结势垒高度的近似公式，重点推导了集电区穿通时的势垒区宽度的定量计算公式，在比较了未发生集电区穿通的势垒区宽度后，得出了重要结论．同时，本文亦给出了考虑应力及界面态密度后对模型的修正方法关键词：空间电荷区;Si1－yGey;穿通2|37|6更新时间：2025-12-08
- 摘要：Using the normal planar technology of bipolar junction transistor,we have fabricated the p n p high frequency,high breakdown voltage transistors which can operate in the wider temperature range from -55℃ to 180℃.In this paper we also describe the design,structure and fabrication of the new device with a smaller drift of h FE when temperature is changed.The tested results show that the changing rate of h FE of the new device is less than or equal to 35% when temperature is raised from 25℃ up to 180℃,which is 20% better than that of the normal bipolar transistor;whereas the changing rate of h FE is less than or equal to 30% when temperature is fallen from 25℃ down to -55℃.关键词：Depletion base;Static induction;Intrinsic gate2|36|2更新时间：2025-12-08
- 摘要：The concept of HCS MOST （Heterogeneous Computing Systems with Machines of the Same Type） has been proposed recently by us.HCS MOST is classified into three classes and the general speedup formulas for them have been introduced.In this paper,with a different application task model,a new speedup model for the second class of them,i.e. HCS〈0,m *,0〉system,is presented.The calculation results derived from computation tasks with different parallelism distribution for an example system HCS〈0,18 *,0〉 are given and analyzed.关键词：Heterogeneous computing system;Performance analysis;speedup;network parallel computing2|57|0更新时间：2025-12-08
- 摘要：This article presents the Boolean Operation Based Structure Matching （BOSM） method,which is based on current matching approaches used in technology mapping.This method not only has the merits of Boolean matching method,but also has the structure matching method advantage of simple time complexity.When a Boolean function has n input variables,BOSM method’s time complexity is O（n 3） .关键词：Boolean operation;matching;technology mapping2|29|0更新时间：2025-12-08
- 摘要：A method to calculate the requirement of the uniformity of the threshold voltage in GaAs IC based on PSPICE simulation is presented and three different GaAs ICs are concerned.The result shows that SDFL has lower requirement of uniformity, σV th is 218mV while DCFL and BDCFL have higher requirements, σV th is 38mV and 35mV respectively.Also find that optimized and unoptimized circuits have different requirements,so do different processes.This conclusion is helpful to the circuit design and process choice.关键词：GaAs IC;Uniformity of threshold voltage;PSPICE simulation2|23|1更新时间：2025-12-08
- 摘要：In this paper,minimal energy principle and finite element method were employed to develop solder joint shapes evolving model of PBGA.And three dimensional solder joint shapes of PBGA was predicted and analyzed.Comparisons were made between results predicted by the current model here and experimental measurements and those generated by mathematical analysis model at abroad.关键词：SMT;BGA;Solder joint shapes;Minimal energy principle2|164|17更新时间：2025-12-08
- 摘要：A novel extensible current mode sorter based on magnitude is proposed.This sorter not only outputs sorted currents based on magnitude,but also determines the order of input terminals corresponding to the order of input currents magnitude.The time and area complexity of the sorter is O（N）.The structure of this sorter is simple,flexible and its scale can be easily extended.This sorter is able to be directly fabricated in a standard digital CMOS process and easily implemented in VLSI technology.关键词：Sorter based on magnitude;Current mode;VLSI2|20|1更新时间：2025-12-08
- 摘要：Same frequency crosstalk will degrade the system performance seriously in all optical networks.The impact of same frequency crosstalk on intensity modulation direct detection system is studied both theoretically and experimentally in this paper.The relationships between the impact and various factors are discussed.Instructions are provided for the design of all optical networks.关键词：All optical networks;Same frequency crosstalk;Power penalty2|79|9更新时间：2025-12-08
- 摘要：Two block ciphers are constructed according to weakness of SAFER.Their structures are like SAFER with complexities a little higher than SAFER,and have encryption decryption similarity,better diffusion features and stronger ability against differential attack.关键词：information security;block cipher;SAFER;differential cryptanalysis2|73|0更新时间：2025-12-08
- 摘要：Importance of sample size was discussed from point view of function approximation.Development of learning theory and its relation to NN was reviewed briefly.The importance of learning theory in research of multilayer feedforward neural network was pointed out.关键词：Multilayer feedforward network;Learning theory;Problems of small sample size2|243|61更新时间：2025-12-08
- 摘要：This paper comprehensively reviews the history of intelligent control from emergence to development.Based on profound introspection and summary of relationships of Artificial Intelligence,Automatic Control,Cybernetics and Intelligent Control,some new viewpoints on intelligent control are proposed by ideas of System Science,Information Science and Cybernetics.Also some important problems from epistemology to methodology are described.关键词：intelligent control;artificial intelligence;Automatic Control;Cybernetics3|635|59更新时间：2025-12-08
- 摘要：A new adaptive genetic algorithm is presented which is based on the change of the mutation probability of each genome.It accelerates search process in state space.The experimental results show that this algorithm has great advantage of convergence property over canonical genetic algorithm.关键词：genetic algorithm;Mutation probability;Convergence property2|612|112更新时间：2025-12-08
- 摘要：Baseline is the key concept in Interferometric SAR （INSAR） analysis.On the basis of the frequency shift theory between two SAR signals,INSAR signal bandwidth,INSAR signal to noise ratio（SNR） and INSAR range resolution are introduced.In a brief and clear way,the optimum baseline is derived.The simulated results are confirmed with the real parameters.关键词：SAR;Interferometry;Optimum Baseline;Frequency shift;Signal Bandwidth;SNR3|274|29更新时间：2025-12-08
- 摘要：A new computer architecture based on the present state of parallel processing and FSOI was proposed.Using beam steering vertical cavity surface emitting laser as space division switching elements,a 3 D processing element array could be built,and a scheme of parallel data streams flow through the architecture was given.关键词：FSOI;computer architecture;parallel processing;reconfigurable computing2|69|0更新时间：2025-12-08
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The Study of the Method about Detection on Burst Noise in Transistor Using the Integrated Bispectrum
摘要：Based on the characteristic of the integrated bispectrum,it can be proved that the probability density function of burst noise is non Gaussian and asymmetric.The method of detection on burst noise in transistor using the integrated bispectrum is given in this paper.关键词：transistor;Burst noise;Integrated bispectrum2|113|6更新时间：2025-12-08 - 摘要：This paper analyses and proposes a circuit model for the wideband series varactor tuned oscillators.At Ka band the electronially tunned bandwidth of 13 3% is achievevd within which the minimum power is 40mW and the maximum 90mW.The electronially tunned maximum bandwidth of 4 6GHz is obtained.关键词：Millimeter wave;Gunn diodes;Voltage tunning oscillators2|191|9更新时间：2025-12-08
- 摘要：By using 4×2 5Gb/s wavelength division multiplexing （WDM） transmission system,an experiment on 3×150 km througth 4 cascaded erbium doped fiber amplifier （EDFA） was carried out.It is shown that the gain coupling effect leads to the differences of gain between the channels due to homogeneous broadening performance of the erbium doped fiber.The population inversion level,or say,saturation depth of the EDFA is the factor that affects the gain spectrum performance.关键词：erbium doped fiber amplifier;Gain spectrum;wavelength division multiplexing2|100|3更新时间：2025-12-08
- 摘要：矩形谐振腔工作于ＴＥ１０７模式（中心频率５８０ＧＨｚ）．黄豆粒置于腔中心，通过测量由它引起的谐振频率偏移和腔传输特性的变化，就可以确定黄豆粒的湿度，其不确定性小于１％，可信度达９５％．关键词：谐振腔;测量;湿度;黄豆粒2|87|5更新时间：2025-12-08
- 摘要：Taking Carry Look Ahead adder as an example,several schemes used to implement test pattern generators in the BIST circuitb are proposed,where deterministic testing is combined with pseudo random testing.Trade off is obtained between test time and overhead of test circuit.In the end,results are compared and analyzed.关键词：BIST;Deterministic testing;Pseudo random testing;TPG;CLA2|69|2更新时间：2025-12-08
- 摘要：Instead of the direct expansion of the charge distribution by the orthogonal wavelet basis,the large full matrix gained from MoM （Method of Moments） discretization of the integral equations is taken as discrete digital signals and sparsified by two dimensional multiresolution representation.Thus,the difficulty of using wavelets on the two and three dimensional structures is overcome.Computational results are given for several typical interconnects and the data obtained show that the proposed method substantially sparsifies the matrix equation.The capacitance values calculated by the matrix equations with high sparsity agree well with the results of the previous papers and that of capacitance extractor FASTCAP.关键词：互连结构;分布电容矩阵;矩量法;小波多分辨率分析2|63|5更新时间：2025-12-08
- 摘要：This paper presents the model of reversible converter with unity power factor.Dynamic character and influence of the circuit parameter are analyzed and simulated on this model.The experimental results are given.关键词：Model;power factor;Reversible Converter2|198|24更新时间：2025-12-08
- 摘要：Discrete but nonbinary state values would offer an advantageour representation of information.The concept of complex signum operation and the concept of Bidirectional Associative Memory （BAM）are combined and a nonbinary BAM is developed,i.e.,Complex Valued Multistate Bidirectional Associative Memory （CVMBAM）.Under the encoding scheme we prove that CVMBAM is stable whatever the synaptic connection weight matrix is.关键词：Complex signum operation;BAM;CVMBAM2|76|1更新时间：2025-12-08
- 摘要：A curve vectorization technique based on the local straight line Hough transform is presented.The Hough function of a curve is constructed in the polar coordinate space,which is divided into the translation term and the intrinsic term.A natural decomposition is provided and one of two terms can be got by eleminating another term according to the graphics attributes.The vectorization of the polyline and curve is realized by using voting strategy algorithm.关键词：Computer graphics;Engineering drawings vectorization;image recognition;Curve parameterization2|147|14更新时间：2025-12-08
- 摘要：MgO TiO 2 ZnO（MTZ） system ceramic have been studied in the paper.The advantages of MLCC prepared from this system ceramic material are positive temperature coefficient of capacitance （ α c =90±20ppm/℃）,high Q（Q 10000）,high working frequency,the resonant frequency （ C =31pF） is up to 690MHz.Changes of capacitance and impedance with frequency were discussed principally.关键词：resonant frequency;Impedence;Temperature coefficient2|127|1更新时间：2025-12-08
- 摘要：A method to optimize CMOS IC parameters using experimental design combining simulations was presented.The effect of process factors′fluctuation on circuit parameters was analyzed and the macro model of circuit parameters was set up to model the relationship between circuit parameters and process factors.Using the model we can get the optimum process conditions which make the threshold voltage at the expected value and with the smallest deviation.关键词：Experimental design;Process factors;threshold voltage;Optimising design2|102|6更新时间：2025-12-08
- 摘要：To erase the bootless power dissipation of the redundant leap of the clock,this paper proposes the design of DETFF （double edge triggered flip flop） and the logic structure based on NAND gates.PSPICE simulation shows that this type of flip flop has correct logic function and can be normally used in the design of sequential circuits.By using the half working frequency of the clock,power dissipation of the system can be reduced evidently.关键词：low power;Flip flop;Logic design;Integrated circuits6|254|30更新时间：2025-12-08
- 摘要：This paper presents a new multistage co channel interference cancellation algorithm for DS/CDMA system.By inserting known symbols into the information stream periodically,the pllot symbol aided channel estimation technique is used to facilitate the coherent demodulation of the reverse link.Interference signals are precisely reconstructed from the output of Viterbi decoder of the convolutional codes.By combining plot symbol alded channel estimation and convolutional codes,the residual error is reduced dramatically but the overall processing delay remains the same.Signal processing procedures and channel estimation algorithm are described along with the performance analyses of the proposed algorithm.Numerical results show that the proposed algorithm outperforms the conventional one.关键词：Cellular mobile systems;CDMA;Multi user detection;Co channel interference cancellation2|130|1更新时间：2025-12-08
- 摘要：Speech vocoder presented in this paper classifies input speech into silent,unvoiced,voiced and mixed classes.Adaptive multi band classification algorithm is applied for unvoiced/voiced decision and active/inactive decision.Such algorithm has improved robustness,accuracy and flexibility of classification,and the quality of mixed speech is also maintained without coding of U/V decision vector.Spectra of unvoiced and voiced classes are encoded with different LSP quantization tables,respectively,and then a scale quantizer could replace a vector quantizer,therefore less complexity is achieved.Bit rates of the vocoder are maximum 2.4kbps and minimum 0.1kbps,and average bit rate is 1.4kbps.A real time software implementation of the vocoder has 0.3 second of system delay.A 40MHz TMS320C50 fixed point DSP is chosen for real time implementation of the decoder and synthesizer parts,and the average computation is 11.3MIPS.关键词：Variable code rate;Phonetic classification;Real time;Vocoder2|46|1更新时间：2025-12-08
- 摘要：A kinetic admittance parameter was introduced on the basis of our general small signal model of superconducting field effect devices.A numerical simulation of low frequency current voltage characteristic for the high Tc superconducting field effect transistor is conducted.Dependence of the normal current and supercurrent in the generalized two fluid model on gate voltage,drain voltage,temperature and frequency was analyzed.A new investigation method of low frequency characteristic of high Tc superconducting field effect devices was founded.关键词：Kinetic admittance simulation;Generalized two fluid model2|26|0更新时间：2025-12-08
- 摘要：The traditional Hilbert Transform （HT） used in extracting and analyzing the envelop of speech signal suffers from some drawbacks,for example,unexpected blurs will appear in the extracted envelops which cause a lot of difficulties in the postprocessing of the speech signal.To overcome these draw backs a novel approach CAWT （Complex Analytical Wavelet Transform） for extracting and analyzing speech signal envelops is proposed in the present paper.The CAWT algorithm together with some simulation results are given which show many advantages over the HT extraction method.It is expected that the CAWT will be helpful in the Chinese speech recognition.关键词：Envelop extraction;Hilbert transform;Analytical Wavelet transform;speech signal2|602|64更新时间：2025-12-08
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