最新刊期
卷 30 ， 期 2 ， 2002
- 摘要：Upstream channel noise consist of input noise in about 70%.Abstract the input noise in a model of narrow-band interference and take a nonlinear suppression measure.Construct a nonlinear narrow-band interference suppresser and simulate in the SCDMA system.Nonlinear DLMS2 and DRLS2 algorithms are extended to QPSK modem system and performances are analyzed.关键词：HFC upstream channel;ingress noise;nonlinear2|1066|1更新时间：2025-07-16
- 摘要：The offsets of most branches can be evaluated from instruction and current PC.Branch target profiling (BTP) mechanism scans prefetched instruction blocks,and generates targets of direct branches.The trace preconstruction mechanism observes the processor's instruction dispatch stream to detect opportunities for jumping ahead of the processor.However,branch hazards prevent trace preconstruction from branch target disambiguity.With the help of BTP,Trace preconstruction mechanism constructs pseudo traces from prefetched instructions.To SPECint95 benchmark suite,BTP can generate branch target accurately,reduces cache access miss rate efficiently,and prompts program performance.关键词：branch target profiling;trace preconstruction2|822|0更新时间：2025-07-16
- 摘要：This paper describes some methods on optimizing parallel processing and data structure for DCT,quantization,and Huffman coding of JPEG algorithm with parallel instruction of 32 bits fixed-point processors,in order to develop its parallel processing capability effectively.The result of simulation indicates that the methods obviously speed up parallel implementation of JPEG Algorithm,being applicable to the real-time image compression.关键词：image compression;parallel processing;pipeline;JPEG algorithm;optimization2|1700|1更新时间：2025-07-16
- 摘要：ROC(Resist-Overload Capability) cache admission control and replacement algorithm are presented to manage cache use in VBR video servers with interval caching.Deterministic cache admission control can guarantee the quality of service but leads to severe under-utilization of cache resources.Statistic cache admission control requires heavy convolution computation which makes it inapplicable.ROC cache admisson control simplifies the convolution computation,and guarantees the cache quality of service.The result of simulation shows ROC cache admission control and replacement algorithm can boost system throughput and improve cache utilization significantly with very low cache overload probability.关键词：interval caching;cache admission control;cache replacement algorithm;VBR video;video server2|1224|2更新时间：2025-07-16
- 摘要：This paper presents an approach of lip-movement features extraction and recognition based on chroma analysis.By the lip chromatic filter,enhanced lip-movement images are obtained.The contours are described and feature parameters are extracted using deformable templates.Sequence images of lip-movement with the features have been recognized by employing the HMM model.This method is quite robust to illumination and speaker independent,and it is fit for realistic surroundings under natural condition.It works out the problem of high resolution on object contours which deformable template needs,and makes itself more practicable.All lip-movement recognition experiments are based on visual information alone (without using acoustic information),the experimental set is limited within single Chinese vowels,and the accuracy rate of recognition gets up to 95.8%.关键词：lip-reading;lip-movement;chroma;deformable template;HMM model4|1516|4更新时间：2025-07-16
- 摘要：Conventional cooperation model can not be applied in modern complicated cooperative systems.According to the requirements of complicated cooperative applications,a dynamic real-time strong cooperation model,DReaSCoM is proposed in this paper.Based on this model,horizontal intra-group cooperation and vertical inter-group cooperation can be implemented in Group Cluster,a new hierarchical structure constructed for the model.The efficiency and fault-tolerant of cooperative systems,applied within the DReaSCoM model,can be both improved.关键词：computer supported cooperative work (CSCW);dynamic;real-time;strong cooperation2|827|0更新时间：2025-07-16
- 摘要：Since typical Hamming networks has not solved the problem of pattern overlap and convergence, and not made full use of the near degree information of the input pattern with other neurons in the network,a fuzzy Hamming neural networks (FHNN) is proposed in this paper.FHNN replaces matching subnet with a fuzzy class membership subnet to solve problems of pattern overlap.It is also a three-layer feed-forward network.The n elements of the input pattern are presented in parallel to the n nodes of the first layer of the subnet.The number of the nodes in the hidden layer is equal to the amount of the exemplar patterns,and the weights of hidden neurons are the components of exemplar.And the number of the nodes in the output layer is equal to that of the classes to classify.The weights are the fuzzy class membership function of exemplar pattern to the classes.Only the training of the threshold T of the hidden layer and the fuzzy class membership weights of the output layer are needed.FHNN replaces competitive subnet with a comparing subnet to solve the problem of not converging and having too many interconnections.The fuzzy membership degrees of an unknown pattern to the classes are compared in parallel with a gradually decreasing reference voltage as a dynamic threshold in the comparing subnet.When the reference voltage decreases to the level of certain fuzzy class membership degree,the corresponding binary outputs skips to 1.Using modular circuit design,this network is easily extended and implemented in VLSI technology.FHNN is composed of three separate chips.The first matching chip gets the matching scores; the second calculates the fuzzy class membership degree.These two chips construct the fuzzy class membership subnet.And the third chip is a comparing subnet.As for the implementation of input mapping subnet,conventional feed-forward network circuits can be used.关键词：Hamming networks;pattern recognition;fuzzy logic;neural network2|749|0更新时间：2025-07-16
- 摘要：Presents a high-speed programmable logic cell for datapath,whose architecture consists of enhanced multiplexer.When the cell is configured for XOR-XNOR-MUX scheme,it can achieve the functions such as one bit full adder and base multiplier cell and so on for datapath application.It is also configured for all 3-input logic and some logic between 4 and 7 input,and used for general combinational logic.The cell is only made up of three 2:1 MUX and two enhanced 2:1 MUX inverted by programming,achieves fast speed and costs little chip area.The advantages of its speed and area are proved by simulation analysis with HSPICE.The larger-propagating delay is less than 0.6ns and the carry-chain delay is less than 0.1ns under 5V,0.6μs CMOS process.关键词：FPGA;programmable cell;datapath3|968|0更新时间：2025-07-16
- 摘要：The genetic algorithm,called GENOCOP,used in the semiconductor device comprehensive system,is improved.The real-valued design space is transformed into integer-valued design space according to the effects of the technical precision of the processing parameters.An adaptive combined operator is introduced to extend and exploit the quasi-feasible space by utilizing the searched points.While keeping the advantage to find the solutions,the coverage of the solution space is improved (about 2.87 times) with same setting.This will help the designers to design workable device more efficiently.关键词：genetic algorithm;device decomposition;GENOCOP(GEenetic algorithm for Numerical Optimization of COonstrained Problems)2|832|0更新时间：2025-07-16
- 摘要：As a key access network,HFC( Hybrid Fiber Coaxial ) network has been deeply studied recently.HFC network has the special tree-and-branch topology.Its upstream and downstream channels are separate from each other in frequency band.The upstream channel is a point-to-multipoint broadcasting channel with a wider bandwidth,while the downstream one is a multipoint-to-point share medium with a narrower bandwidth.So,the most key issues in MAC protocol design of the HFC network are focused on how to resolve the collision efficiently,how to improve the bandwidth utility and how to lower the access time delay while using upstream channels.This paper theoretically analyzed the main factors that affect these performances of a MAC protocol based on most popular designs.Also we studied the performance of DOCSIS v1.0 MAC protocol through simulation.The test results approve our analysis well.This paper can give us some guidance in our further exploration of HFC access technology.关键词：HFC network;MAC layer protocol;bandwidth utility;access time delay;DOCSIS3|1034|1更新时间：2025-07-16
- 摘要：The paper expatiates on network behavior of Internet and the characteristics of the traffic phase transition phenomena from macroscopic viewpoint.The effects on network system behavior and control algorithm arising from the existence of phase transition are also discussed.Finally,an improved network traffic model based on these phase transition phenomena,which can reproduce the basic statistic physical property of aggregated network traffic,is presented.Simulation results validate our improved network traffic model.关键词：Internet;traffic model;phase transition;critical behavior2|946|0更新时间：2025-07-16
- 摘要：The problem of IP routing lookups has received much attention recently because It is one of the main reasons why performance of core routers in the Internet becomes the bottleneck.Several algorithms for solving this problem have been proposed,but none is ideal.In this paper we propose an algorithm of IP routing lookups using compressed next hop table.The algorithm has characteristics such as fast search time,fast update time,small memory space and easy implementation,and can be used in core routers that have 10Gbps interfaces.关键词：NH(Next Hop) table;IP routing lookup;core router2|1250|4更新时间：2025-07-16
- 摘要：By using evolution of information entropy in target detection and prediction and updating matrices of covariance in Kalman filter equations,we can solve information gain in a measurement for target detection or tracking,and present a method of sensor management based on maximization of information gain.Simulation results show that this method can rationally assign the limited sensor resources and improve the whole performance of tracking system compared with sequence tracking method,and can maximally detect and track new targets under a certain tracking precision compared with random detection and tracking.关键词：covariance matrix;sensor management;detection and tracking2|991|9更新时间：2025-07-16
- 摘要：The enhancement layer rate allocation problem is examined in progressive fine granular scalable (PFGS) video coding.The problem arises from the fact that different frames in the enhancement layer have different rates in PFGS coding.A rate-distortion (R-D) function for a multi-frame group is first established for enhancement layer PFGS coding,followed by experiments to verify its validity using real test sequences.Optimal rate allocation among frames in the group is then given based on the R-D function,together with a simple implementation that is suitable for applications like streaming video.Experiments show that,compared with uniform bit allocation,optimal bit allocation not only makes the quality variation in decoded video much smoother,but also improves the average PSNR of PFGS coding by 0.3~0.5dB.关键词：scalable coding;error propagation;rate distortion function;rate allocation2|916|3更新时间：2025-07-16
- 摘要：A flexible DC link-global soft switch-full bridge inverter for MH(Metal Kailed) lamps has been proposed.The main contributions of the paper are as follows:(1) A new topology about DC link,using Buck converter as DC link,has been given out;(2) A ZCS-ZVS-PWM-Buck converter has been analyzed;(3) A new controlling strategy for the inverter has been developed.The results of the simulation and experiments (with output power of 2.7kW) provided in the paper have shown that the new inverter has many merits.关键词：DC link;soft switch;inverter;controlling strategy2|938|0更新时间：2025-07-16
- 摘要：A synchronous error equation for semiconductor lasers injected with external light is presented.Two chaotic systems with distributed feedback semiconductor lasers injected with external light at 1.31μm can be synchronized with little synchronous error.The chaotic synchronous system has been successfully stimulated in a long propagation distance optical fiber.The synchronous error increases with the fiber length.The synchronization is limited by the self-phase modulation in the fiber.The influences of intensity and phase noises on the synchronous error are studied in different propagation distances.Both analog and digital secure communications with the system are studied by numerical simulations in the long propagating distances.It is found that the information is hidden in the chaotic signal very well both in time-domain and frequency-domain and the system shows the good ability of robust security and anti-uncoverage.2|1008|2更新时间：2025-07-16
- 摘要：The effect on pulse compression in dispersion-managed fibers is studied.The higher pulse compression ratios are obtained in both zero total dispersion fibers and nonzero total dispersion fibers.The optimum fiber length of the latter is about half of the former.When higher-order dispersion and higher-nonlinear effects are considered,the quality of compressed pulse becomes worse.The destructive effect in the dispersion-managed fiber of nonzero total dispersion is more serious.3|1184|3更新时间：2025-07-16
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Data Fusion Algorithm Based on D-S Evidential Theory and Its Application for Circuit Fault Diagnosis
摘要：A data fusion method for circuit fault diagnosis based on D-S evidential theory and fuzzy logical theory is presented.By measuring the temperature and voltage of circuit component,the belief function assignment of two sensors to circuit component is gotten,and the fusion belief function assignment is gotten by using D-S rule,and fault component is found.By comparing the diagnosis results based on separate original data and fused data respectively,it is shown that the latter is more accurate than the former in the circuit fault recognition.关键词：D-S evidential theory;belief function;data fusion;fault diagnosis2|3135|55更新时间：2025-07-16 - 摘要：The Real-Time Programming language is considered as system description language with temporal constraints.There are shortcomings in the temporal mechanism of existed language.So,The paper presents the RTS/Java Real-Time language based on Java to solve the mapping from TGM model to RT-Actor model.The language defines the RTS/Java class,method and their constraints,and designs the method innovation mechanism.The mechanism has solved Allen's temporal constraints.RTS/Java language succeeds in describing the real-time simulation system of three surveillance satellites.RTS/Java features:(1) explicitly expressing temporal constraint,(2)temporal constructs illustrating task's period,(3)temporal logic independent of computer hardware,(4)the pure Object-Oriented style,multi-front-end sharing resources.关键词：real-time tasks;temporal constrains;Java;modeling language2|1023|0更新时间：2025-07-16
- 摘要：According to the properties of impurities with incomplete ionization and high saturated electron drift velocity in silicon carbide,a quasi analytical large-signal capacitance model of 4H-SiC MESFET for RF power applications is proposed utilizing the charge controlling theory and carrier velocity saturation theory,combined with description of hyperbolic tangent function.The comparison between simulations and measurements shows a good agreement.The model is simple in calculations and distinct in physical mechanism,therefore suitable for design of microwave devices and circuits.关键词：SiC;RF;MESFET;capacitance model3|1127|1更新时间：2025-07-16
- 摘要：The distortion behavior of Silicon-On-Insulator (SOI) MOSFET is systematically discussed in this paper.With Power series analysis method,the harmonic distortion of different configurations of SOI devices (PD,FD and BC) is experimentally investigated.At the same time,a continuous distortion model for SOI MOSFET is presented by including the main distortion-causing mechanisms and the smoothing function.The accuracy of this model has been verified by reproducing the experimental data.The results can be used to evaluate the distortion behavior of mixed mode integrated circuit and serve as a guideline for the optimization of low distortion application.关键词：distortion analysis;power series method;distortion model;SOI MOSFET3|750|0更新时间：2025-07-16
- 摘要：This paper discusses the subprogram synthesis method in RTL synthesis system and brings forward concrete algorithm which aims at particular data structure of RTL synthesis system.At the end of this paper gives experiment results.关键词：RTL synthesis;subprogram;format judgement;combination logic synthesis;sequential logic synthesis;VHDL2|776|0更新时间：2025-07-16
- 摘要：Nowadays the amount of information on the Internet is increasing dramatically.The ability of facilitating users to achieve useful information is more and more important for information retrieval systems. Parch,a model for personalized Internet information retrieval systems is proposed.This model can help users to retrieve what they need by combining class hierarchy with user profile.Several algorithms that use key technologies are proposed,such as data mining,information retrieval and machine learning.These algorithms can make a user profile less manually interfered,more self-adaptive and more accurate,and meanwhile achieve a faster congregating speed in building the class hierarchy by reducing the computing workload.关键词：personalized information retrieval;user profile;class hierarchy;data mining;agent2|1176|9更新时间：2025-07-16
- 摘要：The research on workflow has been focused on the verification of workflow task structure,but few have paid attention to the properties of the models,which are closely related to the time,especially the problems of temporal inference and performance calculation.In this paper,we research on this aspect.Timed Petri Nets are used to model workflows as well as analyze the temporal relations of the model.A set of linear inference rules is put forward.Using these rules,we can simplify the complicated model step by step,and solve the inference problem within linear time complexity.关键词：workflow management systems;timed Petri nets;linear inference2|1202|13更新时间：2025-07-16
- 摘要：This paper presents a fully differential R-MOSFET-C 4th-order Bessel active low-pass filter with group delay adjusted by tuning the channel transconductance of CMOS transistors worked in weak inversion region.The tuning can counteract the deviation of resistor in the manufacture of integrated circuit,therefore the group delay of Bessel active filter can be designed and realized accurately .The active filter can be synthesized according to the state equation of passive filter.Computer simulation of 4th-order Bessel low-pass filter with 0.75μs group delay indicate that the proposed circuits are both effective using 3.3V、0.5μm CMOS technology,and suitable for integration.关键词：fully differential;active filter;group delay;low-voltage low power circuits2|1608|0更新时间：2025-07-16
- 摘要：This paper describes the characterization of the hot carrier-induced interface traps by a forward gated-diode measurement in an N-channel MOSFET/SOI.The experimental results achieved by this method show that the R-G current peak can directly give stress-induced average interface trap density so to characterize the device's hot carrier degradation behavior and evaluate the quality of SOI wafer.As expected,a power law of ΔNit~t0.787 between the stress-induced interface trap density and accumulated stressed time has been obtained.关键词：hot carrier effect;interface traps;R-G current;gated-diode;MOSFET/SOI2|2114|2更新时间：2025-07-16
- 摘要：The technology of YAG (yttrium aluminum garnet) used as the projection tube phosphor screen substrate successfully was introduced.The new type projection CRT has the advantages of compactness,high luminance,high resolution and long life,and has been already used in the 122cm and 183cm consumer real projector,and business video wall display.关键词：YAG projection tube;luminance;resolution;electrovacuo glass;electron gun;phosphor screen2|985|1更新时间：2025-07-16
- 摘要：The breakdown characteristic of a new PDP discharge cell is investigated.This novel structure of PDP has many advantages,such as low discharging voltage,high response frequency,high brightness and low cost etc..The comparison with conventional coplanar PDP has been made.The electric field distribution and the density distribution of particles at different time have been given.The variation of average density of particles has also been calculated.The luminance efficiency of 14″ experimental panel with the novel structure is 0.9lm/W and the power consumption is 50W without energy recovery circuit.关键词：plasma display panel (PDP);breakdown characteristic;discharge voltage2|1065|8更新时间：2025-07-16
- 摘要：A new type of micromechanical optical modulator with a MARS structure is presented,which is fabricated by the surface micromechanical process.The measurement results show that the modulator has a series of resonant frequencies.When the modulator is drived by the sinusoidal signal,the response signal is also sinusoidal.However,when the modulator is drived by the square wave signal,the response signal depends on the driving frequency.If the frequency of the driving signal is far less than the resonant frequency,the modulator is drived by the up and down step signal: there is a damp vibration phenomenon.If the driving frequency is close to the resonant frequency,only the fundamental frequency part of the square wave has an effect: the modulator response is the sinusoidal signal.关键词：micromechanical system;optical modulator;resonant frequencies2|897|2更新时间：2025-07-16
- 摘要：This paper presents a novel adaptive denoising method based on wavelet shrinkage method.First,we present a new class of thresholding function that has continuous derivative while the derivative of standard soft-thresholding function is not continuous.The new thresholding function makes it possible to construct an adaptive algorithm whenever using the wavelet shrinkage method.Second,by using the new thresholding function,we present an adaptive method based on SURE Risk.At last,several numerical examples are given,the result shows that the proposed method is very effective in adaptively finding the optimal solution in mean square error(MSE) sense.It also indicates that this method gives better MSE performance than other wavelet shrinkage methods.关键词：wavelet transformation;thresholding function;adaptive denoising;LMS;wavelet thrinkage2|2130|39更新时间：2025-07-16
- 摘要：MOS capacitors with 3.4nm gate oxide layer were manufactured in this experiment.By measuring current voltage characteristic and evolution of the gate voltage during constant current stress of the capacitors,the electrical characteristics of the gate oxide have been studied.In addition,the effect of boron penetration on gate oxide was investigated.The experimental results showed that the average breakdown field of the 3.4nm gate oxide was 16.7MV/cm.Under constant current stress,soft breakdown occured and the average charge-to-breakdown was 2.7C/cm 2.For p+ polysilicon gate MOS capacitor,breakdown field and charge-to-breakdown of gate oxide were all decreased because of boron penetration.关键词：ultra-thin gate oxide;soft breakdown;boron penetration2|1210|0更新时间：2025-07-16
- 摘要：The security weakness of Border Gateway Protocol (BGP-4) is analyzed.Aiming at the weakness,the protocol are extended with some security properties.Digital signature mechanism is used to protect the AS-PATH information.To satisfy the characteristic of distributed routing protocol,a distributed key generation algorithm based on RSA is presented.By integrating these techniques,confidentiality,creditability and integrity of BGP are protected in keeping the packet length with near constant space.关键词：routing protocol;BGP;confidentiality;creditability;integrity2|1199|6更新时间：2025-07-16
- 摘要：With development of network scale and hardware,router solution project based on Traffic Engineering has been more and more poprlar.And in the Traffic Engineering solution project,Traffic Engineering dynamic routing is an important part.So,we have analysed the current situation,and presented TE dynamic routing math model,which takes bandwidth and hops into account and presents routing rules.In the end,by the computer simulation,we validate the feasibility of the routing and advantage of the current shortest path priority routing.关键词：traffic engineering;routing;bandwidth;hops2|2793|6更新时间：2025-07-16
- 摘要：In this paper,we propose a new multipath routing protocol for ad hoc wireless networks-Multipath Source Routing (MSR),which is based on DSR (Dynamic Source Routing).MSR extends DSR's Route Discovery and Route Maintenance mechanism to deal with multipath routing.Based on the measurement of RTT,we propose a scheme to distribute load between multiple paths.The simulation results show that our approach improves the packet delivery ratio of TCP and UDP,and reduces the end-to-end delay,packet loss rate and the queue size,while adding little overhead.As a result,MSR releases the network congestion quite well.关键词：multipath routing;source routing;wireless Ad Hoc network2|1251|10更新时间：2025-07-16
- 摘要：CS-CIPHER is a block cipher as a candidate for NESSIE,whose block length is 64 bits.In this paper two variants of CS-CIPHER by linear cryptanalysis.The attack to the first variant needs 232 counters and 252 known-plaintexts.The success rate of attack is about 78.5%.The attack to the second variant needs 252known-plaintexts and 2112 counters.The success rate is about 78.5%.关键词：block cipher;linear cryptanalysis;S-box2|1007|0更新时间：2025-07-16
- 摘要：Non-repudiation and fairness turn out to be two important security properties of electronic commerce protocols.In this paper,based on a verifiable encryption with blind decryption,we present a new fair non-repudiation protocol with off-line semi-trusted third party,so either transaction party can unilaterally bring a transaction to completion without losing fairness.This is the first non-repudiation protocol with off-line semi-trusted third party.关键词：electronic commerce;non-repudiation;fairness;semi-trusted third party;verifiable encryption with blind decryption2|927|4更新时间：2025-07-16
- 摘要：Continuous time-delay chaotic system is the infinite dimensional system which can produce several positive Lyapunov exponents,so such system can produce complex time sequences.This character make it suitable to be applied to secure communication.Based on this analysis,in this paper we first research on the identification of C parameter in M-G hyperchaotic system and propose a new method of identifying C parameter in M-G system.Secondly we attempt to modulate C parameter of this system using the message signal in the transmitter,and at the receiver the message signal is demodulated by using our method of parameter identification.Thus we realize the secure communication.The numerical simulations show that the proposed method can demodulate the message signal well when the convergence time of identification is smaller than the duration of the digital signal.关键词：parameter identification;time-delay hyperchaotic system;secure communication2|783|3更新时间：2025-07-16
- 摘要：The relative sources and the time period can be defined by learning all features changes in a period.The set of examples is groups of time series of source data.A decision tree is constructed by the information gain.After the coherence estimation,the same as time series,the irrelative sources are washed out and relative sources are selected to be applied for fusion.The method fit the large scale fusion of dynamic hidden.关键词：data fusion;learning from examples;decision tree;mining;dynamic association2|880|3更新时间：2025-07-16
- 摘要：This paper presents a new high-speed FIR Filter structure which includes a unique multiplier-adder unit.Through studying BOOTH multiplier and high-speed adder structures,we explored a new multipiler-add unit.With this multiplier-adder unit,we can implement FIR filters with any orders.In the end,we design a chroma FIR filter with this type fitler,and compare to the filter employed with the converntional structure.关键词：finite impulse response filter;very large scale IC;BOOTH multiplier;adder array tree2|1097|1更新时间：2025-07-16
- 摘要：A linearly-graded drift region-doped LDMOS transistor is evaluated in this paper.The characteristics of the LDMOS with a linearly-graded drift region-doped profile have been demonstrated by the 2D semiconductor simulator MEDICI and verified by our experimental results.It has been shown that the reduction of the on-resistance by 30% from 7.7mΩ·cm2 to 5 mΩ·cm2 in the on-state and increase of the breakdown voltage by a factor of 1.5 from 178V to 234V in the off-state are obtained for the presented LDMOS structure when compared with those of the optimized conventional RESURF device.2|1329|0更新时间：2025-07-16
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