最新刊期
卷 ， 期 11 ， 1997
- 摘要：In this paper,we present a graph simplifying method which is fit for graph coloring problem. In this method,each node is deleted whenever its degree in the attained graph is less than a certain value. When graph coloring algorithms are combined with this simpliying method, their performances can be improved. We also exploit the schemes of setting the value and combining this method with GAs, and show the promising results of the simulation. Finally, it is pointed out that the method is also fit for other graph problems such as the largest clique, maximum independent set, etc.关键词：graph theory;Simplify;Graph coloring;Largest clique;genetic algorithm2|96|3更新时间：2025-12-08
- 摘要：This paper describes the design and implementation of a dual channel oversampled A/D converter. The converter uses a cascaded 4th order sigma-delta modulator. Through the modification of modulator’s interstage gains,the modulator’ large signal overload problem is alleviatednd the maximum output signal to noise ratio is increased. A low noise current-steering logic is introduced to replace static CMOS for digital circuit design,which reduces the digital switching noise coupling in the A/D converter.The experimental chip is fabricated in 3μm CMOS technology. Test results show that, with a oversampling ratio of 64,a 91dB and 84.5dB dynamic range for two channels is achieved which uses current-steering logic and static CMOS respectively.关键词：Oversampled;Sigma-delta modulator;low noise2|124|0更新时间：2025-12-08
- 摘要：This paper solved the boundary extension problem of wavelet. We presented two classes of zero-error extension methods, which establish extension equstion such that we can get perfect reconstruction at boundary. We described the second class algorithm in detail. The experimental results correspond with theory very well.关键词：wavelet transform;Boundary extension;Zero-error boundary extension2|141|17更新时间：2025-12-08
- 摘要：Static and AC small signal analytical models to describe correctly Kink effect and low frequency dispersion effect in HEMTs are established in this paper considering interface traps, also the effects of in contents and bias are studied theoretically. The theory in this paper matches the experiment dais very well.关键词：High electron mobility transistor （HEMT）;model;Kink effect;Lom frequency dispersion effect2|107|1更新时间：2025-12-08
- 摘要：This paper presents some combinatorial algorithms for global optimization problems, which can be applied to solve model parameter extraction in bipolar junction transistors（BJT）. The main advantage of combinatorial algorithms to a traditional algorithm like Gauss-Newton method lies in that it needs no computation of the gradient of the objective function. Moreover, the global optimality of this approach is also better than GaussNewton method. As the selection of the initial point and iterative straegies proposed in this paper are based on global search, the combinatorial algorithms are more simple, efficient, and suitable for global optimzing.关键词：parameter extraction;combinatorial design;Latin square;Global optimization2|151|6更新时间：2025-12-08
- 摘要：Motion perception is one of the most important components of biological vision system. In this paper,by simulating the lateral inhibitory mechanism of the neurons in the motion area of visual cortex,we propose a new Multiplicative Inhibitory Velocity Detector（MIVD）. The optimum velocity of this detector is determined by its spatial-temporal joint parameter K. Based on the respoase disarity of MIVD,we construct two multi velocity fusion Neural Networks（a simple one and an active one）to detect the velocity of one dimensional motion.The experiments show that the active MIVD Neural Networks with feedback have better detecting result.关键词：Early vision;One dimensional motion perception;Multiplicate inhibition;neural networks;Velocity selectivity;Multi-information fusion.2|78|3更新时间：2025-12-08
- 摘要：In this paper the absorption cross sections of Er3+ in the fluoride glasses host are obtained from its measured stimulated emission cross sections using the more general theory of McCumber. Based on this, we make the theoretical and experimental study of the multichannel signal amplification in an Erbium-doped fiber amplifiers which have a flattened small signal gain spectrum and get the same results. we also propose a new simple plan for gain equalization in "Wavelength Division Multiplexing + Erbium-Doped Fiber Amplifiers"Trunk lightwave systems by using Erbium-Doped Fluoride Fiber Amplifiers as its repeaters.关键词：fiber communication;Erbium-doped fiber amplifier;Wavelength division multiplexing2|84|0更新时间：2025-12-08
- 摘要：The optimum design parameters of InGaAs（P）strained multiple-quantum-well lasers are presented .Taking the non-homogeneity of injection carriers and optical field into account, a new method of analysis and calculation is also provided.In the case of 1 .5% compressively strained lasers,the optimum number of wells is four,and the optimum lasers’ cavity length is about 500 micrometers.关键词：Multipe-quantum-well;Model gain;optimum design2|101|1更新时间：2025-12-08
- 摘要：In this paper,an efficient method known as Domain Decomposition Method（DDM）is first employed in parameter extraction of 3-D multilayered and multiconductor interconnects. The quasi-static capacitance matrix can be obtained quickly and exactly by using this method. Since DDM can separate a big problem into several small ones, not only is the problem size decreased, but also many different types of 3-D interconnects can be combined together in this algorithm flexibly. Then by choosing the best way to deal with each of small problems by taking full advantage of the characteristic of the stratified structure in integrated circuit, CPU time and physical memory are saved greatly. Compared with Ansoft’s parameter extractor 3D, the results given in this paper are quite accurate, and computing time and space needed are tens times less than those used by Ansoft software.关键词：3-D interconnects;parameter extraction;Domain decomposition method2|63|4更新时间：2025-12-08
- 摘要：In this paper, it is argured that regular fuzzy neural networks can be universal approximators to continuously subtractable fuzzy valued functions, defined on the interval [0, T0]. Then arbitrarily accurate approximations of triangle fuzzy number valued functions that are continuously increasin on [0, T0] by regularfuzzy neural networks are showed.关键词：Regular fuzzy neural network;Subtractable fuzzy valued function;Sigmoidal function;Triangle fuzzy number2|58|9更新时间：2025-12-08
- 摘要：A three-band analysis for power factor active correction circuits（abbrev. PFC） has been given in illustration of Boost PFC in this paper.The main contributions in the paper are as follows: 1. The formula of duty factor about SPWM and an ideal model of PF = 1 has been proved;2.A DC analysis of PFC has been developed with two-bine average mothed; 3. Based on average state equation, a low frequency analysis has been proposed;4. Using transient formulas of inductor current, a high frequency（carrier wave）analysis has been studied.The conclusion of thes paper provides the simple method of analysis and theoretical base of design and adjustment for all PFC circuits.关键词：Switching Supply;power factor;Frequency band2|97|12更新时间：2025-12-08
- 摘要：This paper proposes a network architecture to support mobile communications in a large university compus. The design allows each mobile host to maintain transport connectivity while roaming freely in the compus. The design combines wireless local-area netwrok （LAN） technology with high-speed Asynchronous Transfer Mode（ATM） switching technology. The combination provides a wireless communication system with sufficient aggregate bandwidth to handle massive, synchenized movements of mobile hosts.关键词：mobile communications;ATM;Internet4|38|0更新时间：2025-12-08
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Discussions on Communication Platforms and Some Related Techniques in Distributed Multimedia Systems
摘要：In recent 10 years, distributed multimedia systems have made rapid advances. The significant progress has been made in many critical techniques. At the same time, new challenges posed by new applications are emerging. In this paper, the communication platforms and related techniques in distributed multimedia systems are discussed and future research trends are anticipated.关键词：multimedia;Distributed multimedia;Communication platforms;synchronization;scheduling;Storage and retrieval2|91|24更新时间：2025-12-08 - 摘要：The main research route of optical interconnects are summarized firstly in this paper,then the count situation and progress of optical interconnects are reviewed, finally, some ideas are presented by means of analysing the problems.关键词：Optical interconnects;Optical waveguide;Electronic interconnects;VISI;OEIC2|245|6更新时间：2025-12-08
- 摘要：Different kinds of object underwater also have different kinds of thermal diffusivity as they in air.This paper describes an underwater thermal sensor which can identify underwater objects by the thermal diffusivity of the object. According to the experiment results of the sensor, its identification rate > 90% and the response time≤5s.关键词：underwater robot;identify;Thermal sensor2|73|0更新时间：2025-12-08
- 摘要：This paper describes the combination of the technique of photo-modulated reflectance spectrum （PR）with the molecular beam epitaxy（MBE）system as an in-situ spectrum measuring technique. Making use of the high sensitivity of PR at room temperature,we demonstrate that the combination of the PR with MBE can be a good in-situ measuring method.关键词：Photo-modulated reflectance spectrum;Molecular beam expitaxy（MBE）2|82|1更新时间：2025-12-08
- 摘要：We used the optogalvanic signal of a gas absorbtion cell as a frequency Standard to stabilize the frequency of InGaAsP and GaAlAs semiconductor lasers. We reprot mainly the results of the design and development on the absoption cells used.关键词：Semiconductor laser;Frequency stabilization;Discharge absorption cell;Optogalvanic signal4|37|2更新时间：2025-12-08
- 摘要：The hydrogenated nanocrystalline silcon films （nc-Si:H） are deposited on silicon substrate byplasma enhanced chemical vapour deposition（PECVD） .The room temperature dark conductivity σof nc-Si: H is in the range of 10-3 -10-1Ω-cm1, higher than that of intrinsic silicon. Diodes consisting of nc-Si: H film are fabricated and their I-V curves show some quantum staircase below 77K. This novel physical features are explained qualitatively.关键词：Quantum dots;Resonant tunneling;Quantum staircase2|68|3更新时间：2025-12-08
- 摘要：In this paper we present a novel physics based analytic model for C- V charactoristics of planar schottky doide which is made in GaAs MESFET process and used in GaAs MMIC.The model focuses on small size, planar technology and ion implant technology, pays much attention to the influnce of side-wall capacitance and under-gate channel series resistance on the C-V chazacteristics of planar schottky doide. Those influnces affect the characteristcs of planar schottky doide notably and are neglected or paid little attention to in other model. In the paper a calculation example of presented model and a comparison between presented model and some other models are presented. The results reveal that the parameter involved in presented model is easy to be determined and the calculation result fits the measured result well.关键词：Planar schottky doide;C-V charactoristics under-gate chanal series resistance;Side-wall capacitance2|43|0更新时间：2025-12-08
- 摘要：In this paper,a new image coding algorithm based on the correlation vector quantization scheme is presented. Improvements are developed in the proposed algorithm to reduce bit rate,such as increasing anticipation blocks, entropy coding of side information according to the condition of the adjacent blocks. The test results show that the reduction in the bit rate of the proposed algorithms is about 4O% against the memoryless vector quantizer,and about 15% against the algorithm proposed in[5].关键词：image coding;vector quantization2|81|13更新时间：2025-12-08
- 摘要：Polarization mode dispersion（PMD）in fiber seriously limits high-capacity optical fiber communication system. Measurement of PMD is realized through wavelength scanning methed in China for the find time.Through comparison among many kinds of imported fibers and fibers made in China, we find that fibers made in China should be modified.关键词：Fiber;dispersion;Polarization;birefringence2|73|5更新时间：2025-12-08
- 摘要：This paper discusses the construction, principle and signal processing method of an artificial skin tactile sensor developed by a kind of sensitive material of PVDF. At the end of the paper,experimental results are given.关键词：Artificial skin;Tactile;robot;signal processing2|299|9更新时间：2025-12-08
- 摘要：Through a switch system, we can connect nodes of a parallel system. Under the control of programe,the switch system connects switches between two nodes that want to communicate, realizing cut-through communication between them. In this paper we investigate the influence of some general cut-through topological structures on communication delay, system communication bandwidth, speed-up ratio and efficiency.关键词：Cut-through communication;topology;communication delay;System bandwidth for using;Speed-up ratio;efficiency2|25|0更新时间：2025-12-08
- 摘要：This paper proposes a hierarchical modeling and simulation approach in power electronics （PE）CAD/CAA.With the help of PSPICE and using a high-power-factor AC-DC converter as an instance,and combining several modeling technologies, technologies, modeling and simulation in three levels have been attained. The result shows that it is a pragmatic analysis and design resolution of PE.关键词：Modeling and simulation;AC-DC converter;power factor2|62|1更新时间：2025-12-08
- 摘要：In the realm of DSP（Digital Signal Processing）,much attention is focused on finding a good way to compress digital signals.Here we study the general features of 1-D digital signals and explore an efficient hybrid description method based on statistics and PIFS. While the compression ratio is between 10 and 20,the SNR of recovered signals is still quite high.关键词：Statistics;PIFS（Piecewise Iterated Function System）;Affine transform;Fractal dimension;signal compression2|22|0更新时间：2025-12-08
- 摘要：A neural network for solving L1-norm minimization problem is presented and is shown to be globally convergent to exact solutions. A simulation result is given to show its global convergence in discrete-time implementation.关键词：L1-norm;Minimization;neural network2|120|3更新时间：2025-12-08
- 摘要：Taking logical function simplification as the background of study, this paper proposes a cognitive diagnosis model which can diagnose and correct the students’behavior for the ICAl system and conforms to chareter of human’s thinking. We discuss in detail the realization of the cognitive diagnosing system for students’behavior in logical function simplifieation. At the same time, some significant achievements trying to find the mistakes hiding in students’behavior and the causes producing the mistakes are achieved.关键词：Diagnoses model;Logical function simplification;ICAI2|39|2更新时间：2025-12-08
- 摘要：The interfusion of multi- agents cooperative environment and distributed Client/Server computing environment is necessary and beneficial. TIs paper puts forward an agent co-operation language ACOL at first. Based on KQML, the language adds some concepts and coordinary languages such as shared - group, privated - group and semaphore of group. Then, we hose a scheme realizing ACOL and building a multi - agents cooperative environment based on integrated middleware CSE/MA.关键词：Multi - agents;Client/Server;middleware;Group;Semaphore2|34|0更新时间：2025-12-08
- 摘要：TIs paper proposes a mechanism of twe-layered multi-center multicast with ordering. This mechasm has been implemented on the workstations connected by the ethernet. We compare the performance of this model with three conventional methods: center-control model, distribute model and tree model. The analysis and esperiment results show that the center-coned model has the advantage of low communication cast and simple implementation, but has per robustness and low parallelism; the distribute model is robustness but has low parallelism and heavy communication cost, the tree model is more efficient than the above two models but it has lOw parallelism and poor robustness at the root node and a complex structure, the proposed method avoids the disadvantages of the three and has the advantages of robustness, high parallelism and simple structure.关键词：multicast with ordering;Two-layered multi-center model;Parallelism;Robustness2|22|0更新时间：2025-12-08
- 摘要：This paper presents the general form of CUSI neurn model,which makes full use of experiEnce samples information within the local range aand breaks some limitation of current neural networks, FurtherMore, we offer its learning algorithm and application examples.关键词：artificial neural network;CUSI neuron;Local property2|48|2更新时间：2025-12-08
- 摘要：计算机辅助测试（ＣＡＴ）工作站包含了带有ＧＰＩＢ通用仪器接口的主控计算机硬件平台和通用的测试软件平台，本文阐述了如何利用虚拟仪器软面板，仪器数据库，流程设计和集成化的工具包来完成对ＣＡＴ工作站测试软件平台的设计和实现．关键词：计算机辅助测试工作站;测试软件平台;集成测试3|43|2更新时间：2025-12-08
- 摘要：A common image classifier for classified still image coding scheme is designed based on Hausdoff-Measure ,by which the image blocks can be grouped into four basic ciasses-Shade, Midrange, Edge and Mited. The introduction of fractal parameters improves the result of ciassification Meanwhile, under certain assumptions and with consideration of Visual Entropy and the characteristies of Human Visual System, two special categories, Key-point and Random-Texture, can be extracted from the fourth groupMixed,which makes possible optimal arrangement of image coding scheme and allocation of bitrate for coefficients in the meaning of subjective visual quality for decoded images.关键词：image processing;Fractal feature;Classified image coding;Visual entropy2|97|13更新时间：2025-12-08
- 摘要：The resolution and reconstruction of component waves from signals by means of Wavelet transforms are studied. A method all a wavelet with scale 2m/a are given.Finally, the numerical simulation tests of the method are carried out.The results show that the method is effective.关键词：wavelet;multiresolution analysis;Resolution of component waves2|32|1更新时间：2025-12-08
- 摘要：We consider in this paper the learning problem of hidden nodes of a three-layend feedforwardneural network. An algorithm for dynamically deleting redundant hidden nodes during the weight learning Process is Presented based on an allalysis Of the differences the outputs of the hidden layer corresjponding to training samples. Numerical results show that the algorithm is feasible关键词：前馈神经网络;隐层结点数;改进的BP算法2|153|17更新时间：2025-12-08
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