最新刊期
卷 35 ， 期 5 ， 2007
- 摘要：The abatement of total organic carbon(TOC),in high purity water by using 185nmUV and 254nmUV irradiation was studied.By this photodegradation method,The TOC concentration in high purity water can be decreased to ≤0.3 μ g/L which meets the requirement for ULSI application.Besides,five kinds of waste water containing diphenyl keton,malachite green,4-chlorophenol(4-CP),4-nitrophenol(4-NP),or Rhodamine B(Rh B),were treated by 185nmUV or 254nmUV irradiation.Experimental data showed that these toxic organic pollutants,which are difficult to degrade by 254nmUV irradiation are easily degradable by 185nmUV irradiation.关键词：185nmUV;254nmUV;total organic carbon;high purity water;waste water2|1283|1更新时间：2025-07-16
- 摘要：Wireless sensor network is a novel technology,and can be applied to both abominable and military environments.During gathering the data,wireless sensor network should decrease the power costs of redundancy information and delay time.The technology of data aggregation can be adopted.A tree formation algorithm for data aggregation based on estimate cost is presented.The paper applies directed transmission model and message route mechanism .The idea of this algorithm is optimization of data aggregation route by estimate cost about energy,distant and aggregation gain,then realizes data aggregation trade-off in energy and delay.关键词：wireless sensor network;data aggregation tree;estimate cost2|1211|5更新时间：2025-07-16
- 摘要：Since 21st century,the test service for digital TV terrestrial broadcasting has been successively carried out in some Chinese big cities,and bus commuters can watch TV programmes while traveling in the signal covered regions.In the trial,it has been found that the environment noise comprising two dominant and distinct components:white Gaussian noise and impulsive noise affects the reception of mobile TV on the vehicle continuously,and that when the equipped vehicle traces along the traffic courses,in a limited time and space,the TV antenna is not able to avoid the noise source from the environment.In order to plan high-effective DTTV signal coverage,it is necessary for engineers to foreknow the noise level of a DTTV channel in the real electromagnetic environment.This paper introduces the results of average noise power of a digital TV channel in UHF band on public transportation lines in Shanghai.Not only the noise fact models but also the noise factor K times variance deviation of its upper decile under three typical communication environments has been obtained through the analysis of nonlinear regression of cumulative distribution functions on the test results.关键词：digital television(TV);terrestrial broadcasting;ultrahigh frequency(UHF) band;mobile receiving;noise factor2|1193|2更新时间：2025-07-16
- 摘要：With the development of Internet technology,the Web Service is playing a more and more important role in satisfying the needs of large and growing community,this in turn demands that Web Servers meet the high QoS(Quality of Service) requirements of applications.In particular,Web Servers needs to deal with problems as highly concurrent requests,different clients with different QoS requirements,and so on.Therefore,how to improve the QoS of Web Servers has become a hot research topic.This paper presents a new proportional delay differserv-enabled model for heterogeneous Web Server clusters.The model describes the request arriving and serving process of cluster nodes by : queuing theory.The paper also puts forward two adaptive algorithms for request selection and dispatch,both algorithms are based on feedback control and each of them has a unique request selection and dispatch strategy.The experiment result is also given.It shows that the model presented here is suitable for heterogeneous Web Server clusters,as the clusters can achieve better QoS performance when these two algorithms are applied.关键词：web server clusters;quality of service(QoS);diffServ;proportional delay;request dispatching;queuing theory2|721|0更新时间：2025-07-16
- 摘要：A system,which measures the statistical distribution of the switching current of a single Josephson junction (JJ) based on time-resolved measurement,is introduced.This system includes both the refrigeration system and the measurement method.Moreover,we tried several techniques to reduce the noise,such as electromagnetic shielding,low-pass filter and ground connection,and the lowest equivalent temperature of JJ in the experiment was reduced to 300mK.关键词：Josephson junction;superconductor;superconducting qubit;noise reduction2|846|3更新时间：2025-07-16
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- 摘要：A new architecture for reconfigurable coprocessorr proposed,refers to as DReAC (Dynamically Reconfigurable Array Coprocessor),which is much helpful for the parallel data processing or the high density computation.DReAC consists of a reconfigurable computing array,a data-cache array and a global control unit.DReAC is able to work in parallel mode or pipeline mode.A behavioral model which was used in simulation algorithms was briefly introduced in this paper.The simulation results show that DReAC achieves much higher performance with 10x factor,comparing with traditional processors and some others reconfigurable processors.关键词：reconfigurable coprocessor;parallel computing;pipeline computing2|691|1更新时间：2025-07-16
- 摘要：Comparing the minimum current through the inductor with the output current,the Energy Transmission Modes (ETM) of Buck-Boost converters can be divided into two types,i.e.,the Complete Inductor Supply Mode (CISM) and the Incomplete Inductor Supply Mode (IISM).The critical inductance and critical condition of CISM and IISM are deduced.Comparing the minimum current through the inductor with zero and the output current,a Buck-Boost converter may work in three operating modes,i.e.,CISM,the Incomplete Inductor Supply Mode as well as Continuous Conduction Mode (IISM-CCM) and the Incomplete Inductor Supply Mode as well as Discontinuous Conduction Mode (IISM-DCM).Formulations for output voltage ripple of Buck-Boost converters in three operating modes are deduced,respectively.As for the Buck-Boost converters with certain load,output capacitance and switching frequency,it is pointed out that the output voltage ripple (OVR) in CISM is the smallest and independent of the inductance,and that the OVR in IISM-CCM and IISM-DCM is much larger and increasing with the decreasing of the inductance.It is concluded that the minimum inductance to guarantee the lowest output ripple voltage is the critical inductance between CISM and IISM.The experiment results are in positive to the analysis results.The experiment results of OVR are a little higher than the analysis due to without considering the parasitic elements of the devices.The feasibility of the proposed methods is proved by the experiment results.关键词：Buck-Boost converter;energy transmission mode;critical inductance;output ripple voltage2|1965|6更新时间：2025-07-16
- 摘要：A novel lateral double-diffused metal oxide semiconductor field effect transistor (LDMOSFET) structure,using an effective concept of dual Polysilicon material gate,is proposed.The conventional polysilicon gate applied in LDMOSFET is divided into S-gate and D-gate by gate engineering.The special gate structure can improve driveability,suppress SCEs(short channel effects) and screen DIBL(drain-induced barrier lowering).The threshold voltage model is solved by two dimensional (2D) Poisson’s equation.The difference of workfunction and doping concentration distribution are also taken into account in the surface potential function.The results predicted by the model are compared with those obtained by 2D simulating to verify the accuracy of the proposed analytical model.关键词：dual polysilicon material gate;LDMOS;threshold voltage2|1524|3更新时间：2025-07-16
- 摘要：The differential evolution algorithm is robust,easy to use,and requires few control parameters.However,as the search of the algorithm is of some blindness,its efficiency is limited.To improve the efficiency of the algorithm,the local enhanced operator is proposed to make some individuals of the population search around the current best individual.Numerical study is carried out using five benchmark functions,and the result is compared with that of dynamic differential evolution and particle swarm optimization.Analysis and simulation results show that the efficiency of modified differential evolution is significantly improved.关键词：global optimization;differential evolution algorithm;local enhanced operator2|1256|13更新时间：2025-07-16
- 摘要：Self-organization of Wireless Sensor Networks (WSN) involves well-regulated linkages and movements independent of fixed communication infrastructures,which is studied in a specific application.After qualitatively analyzing the self-organization characteristics of WSN,we propose self-organization estimate methods including self-organization degree and energy consumption per unit of self-organization degree,through which the self-organization evolving mechanism is quantitatively analyzed in a typical application.Simulations show that WSN in the specific application has a self-organization process of gestation,growing,maturing,withering and death,and the self-organization energy-consuming relies on specific deployment patterns and radio models.关键词：Wireless sensor networks;self-organization;energy consuming2|1204|4更新时间：2025-07-16
- 摘要：For complicated recognition problem,the number of support vectors is large and recognition speed is low,because some sample were divided into section by error this time.To solve this problem,a method is bought to simplify the support vector machines based the minimal misestimate margin idea.Experiments show that this new support vector machine not only reduces the number of support vectors and recognition time but also has the same accuracy as(even better than) traditional support vector machine.关键词：support vector machine;pattern recognition;support vector pruning2|917|4更新时间：2025-07-16
- 摘要：Constructive Kernel Covering Algorithm is inducted into intrusion detection and an anomaly intrusion detection.This method based on Constructive Kernel Covering Algorithm is proposed which applied to monitoring the abnormal behavior of processes.Firstly,this paper analyzes the possibility of Kernel Covering Algorithm applied to intrusion detection;Secondly,the Kernel Covering Algorithm generalized on heterogeneous datasets is described,and a model of anomaly intrusion detection based on Kernel Covering Algorithm is proposed.Then we illustrate the sendmail system call sequence dataset and discuss the working process of this model in detail;Finally,the emulation result is compared with other methods.The result indicates that this method is superior to other similar methods.关键词：anomaly intrusion detection;constructive kernel covering algorithm;heterogeneous datasets;system call2|773|2更新时间：2025-07-16
- 摘要：So far the gapped kernels are used in many fields,such as text classification and protein classification.In this paper,a new kind of gapped kernel is presented,which is called length-weighted kernel,including p-length-weighted and all-length-weighted kernels.Length-weighted kernels can be used to detect intrusion process.Furthermore,a dynamic programming algorithm based on suffix kernel is proposed to compute the length-weighted kernels.Moreover,a bit-parallel technique is used to reduce the complexity of p-length-weighted kernel.The empirical results suggest that this bit-parallel technique algorithm outperforms the other approaches in some cases where the necessary condition of using bit-parallel technique can be satisfied,and that the new kernels can achieve better performance than others gapped kernels.关键词：kernel methods;string kernels;gapped kernels;bit-parallel technique2|888|1更新时间：2025-07-16
- 摘要：This paper presents a dynamic and transparent toolkit,SafeBird,to defend against run-time buffer overflows by combining several techniques.SafeBird consists of three tools:SIET,LibsafeXP and SLI.SIET extracts the size and starting address information of program global variables from the symbol section of ELF executable file.LibsafeXP,a dynamic shared library and an extension to Libsafe,contains wrapper functions for all the buffer related C Standard Library functions.These wrapper functions are enforced to check the source and target buffer’s size using the following information:global buffer knowledge provided by SIET,heap buffer knowledge by intercepting/tracking memory allocation family functions,and stack buffer bound information by dynamically determined from the frame pointer.The third tool SLI is used to accomplish the function interception and inject the shared library,LibsafeXP,into the running process online without interruption.Compared with existing approaches,SafeBird is more transparent to programs:it works on binary mode,and neither requires the source code or any debug information,nor needs to stop/restart the protected software.Performance and effectiveness evaluations indicate that SafeBird could be used to prevent run-time buffer overflow attacks efficiently,and imposes only about 10 percent overhead on average.关键词：computer security;software security;software vulnerability;buffer overflows2|657|5更新时间：2025-07-16
- 摘要：Extending the ring signature scheme for individual person,a novel ring signature scheme for general subsets of a group is proposed.In the scheme,the members of signing subset firstly construct a group including themselves,then construct a set of subsets including the signing subset,namely the authorized subsets.The signature is generated by co-operation of all members of the signing subset.The verifier can verify whether the signature is generated by one of the authorized subsets,but s/he cannot find out the detailed signing subset.The scheme is proved secure under the random oracle model.And the results of complexity analysis show that the scheme is efficient.关键词：cryptography;digital signature;group signature;ring signature;authorized subset2|630|2更新时间：2025-07-16
- 摘要：How to guarantee the smooth transmission of video streams over IP network has been a hotspot at the area of multimedia communications.The traditional PCR-assist CBR schemes employ the timing information provided by the Program Clock Reference(PCR) embedded in the video streams to regulate their transmission,which reduce the buffer requirement at the cost of higher transmission rate when playing low-rate video streams.For the robust transmission of video streams with high rates,a novel transmission method is presented in this paper.It uses more detailed time scale and self-adapting buffer mechanism at the server side to smooth the rate variation further.Simulation results show that this method serves best for the transmission and playback by slowing down the transmission rate without higher buffer requirement.关键词：MPEG-2;transport stream;variable bit rate;program clock reference2|1456|1更新时间：2025-07-16
- 摘要：Mining frequent itemsets from data streams has extensively been studied,and most of them focus on finding complete set of frequent itemsets in a data stream.Because of numerous redundant data and patterns in main memory,they cannot get very good performance in time and space.Therefore,mining frequent closed itemsets in data streams becomes a new important problem in recent years,where algorithm Moment was regarded as a typical method of them.This paper presents an algorithm,called A-Moment,which uses the damped window technique,approximate count method and distributed updating strategy to get higher mining efficiency.Experimental results show that our algorithm performs much better than the previous approaches.关键词：data mining;data stream;frequent closed itemset2|676|7更新时间：2025-07-16
- 摘要：As feature size shrinking,integration increasing and chip area expanding,delay and reliability of global wires become the bottleneck of IC design.Network-on-Chips (NoCs) have been proposed as one of the solutions of System-on-Chips (SoCs) communication infrastructure and enable a new SoC paradigm—System-on-Network-on-Chip (SoNoC).Traffic patterns in SoNoC are both stochastic and deterministic;so on-chip networks must be application-specific.Based on SoNoC design flow,a group of algorithms—FRoD (Floor-plan and Routing on Discrete plane) has been proposed.General definition of discrete plane and four discretization methods have been discussed,and the FRoD algorithms have been verified on the four planes.In order to decouple the system requirements and network architectures,the splitting growth floor-plan algorithm has been developed and can save about 30% execution time and 20% transmission energy,compared with random floor-plan results.Sequential,parallel and mixed routing algorithms have been developed to link all the traffic with shortest paths and can save 10%~30% area cost,compared with full-linked networks.关键词：network-on-chip;system-on-chip;system-on-network-on-chip;NoC synthesis2|1760|7更新时间：2025-07-16
- 摘要：To measure the concentration of dissolved carbon dioxide,using the material NiO which is sensing to CO2 at room temperature,a novel all-solid-state dissolved CO2 sensor was developed based on the carbon-paste film forming.In this paper,the sensor structure and the sensing mechanism of NiO to CO2 were discussed.And the response characteristics of Δ Vrs (the reference voltage shift) versus the dissolved CO2 concentration which were bound at different biases and different temperatures were given.The experimental results show that the dissolved carbon sensor based on the MISFET structure with Pt-NiO mixed sensing film is feasible to determine the concentration of dissolved CO2 at room temperature.关键词：dissolved CO2 sensor;Pt-NiO mixed sensing film;MISFET structure2|737|1更新时间：2025-07-16
- 摘要：With the development of VLSI technology and increasing complexity of embedded electronics products,System-on-Chip (SoC) design encounters some problems,such as throughput,power,signal integrity,latency and clock synchronization.As bus-based on-chip communication architecture will not be able to serve future chips,Network-on-Chip (NoC) was introduced to solve the problems mentioned above.This paper puts forward a Cluster Generation (CG) algorithm in hierarchical NoC design,according to the technology and application requirements.Experiments show with CG algorithm,we may allocate on-chip communication efficiently,improve system performance,decrease hardware cost,and at the same time meet Quality-of-Service requirement.关键词：system-on-chip;network-on-chip;cluster;hierarchical;algorithm2|646|2更新时间：2025-07-16
- 摘要：The traditional entropy is an efficient method for high-level power estimation,but it doesn’t work when the input signals are temporal correlated,as is always the case for video and audio streams.This paper aims at this problem.We put forward a new definition of entropy.With the help of the conditional transition probabilities,the proposed algorithm can bring us the estimations with adequate accuracy for temporal correlated inputs.The theoretical proofs and the BENCHMARK experimental results verify the efficiency of our algorithm.关键词：temporal correlation;power estimation;entropy2|752|0更新时间：2025-07-16
- 摘要：The hybrid time-frequency method was modified to analyze the simultaneous switching noise in power distribution network.The matrix was decomposed in QR form using modified Gram-Schmidt orthogonal method to solve the ill-conditioned problem in macromodel construction in the time domain using rational function approximation.Meanwhile,a simple equivalent circuit model was presented for circuit simulation in HSPICE.Finally a specific numerical simulation study demonstrates the validity of the method.关键词：power distribution network;simultaneous switching noise;macromode2|639|2更新时间：2025-07-16
- 摘要：Target tracking in complex situations is challenging,especially in visual tracking,which is always performed in single-view system.Because of the conflict between resolution and tracking range,however,single-view tracking is not robust and accurate.This paper presents a distributed multi-view tracking system using collaborative signal processing (CSP) in distributed wireless sensor networks (DWSNs),and introduces a progressive distributed data fusion mechanism.This mechanism dynamically chooses the optimal sensor nodes and schedules the fusion process with several measures of energy consumption and information utility.Finally,an indoor target tracking experiment is illustrated,and then tracking performance,execution time and energy consumption of progressive distributed data fusion based CSP are compared with centralized data fusion based CSP.Experimental results demonstrate that the distributed multi-view tracking system using progressive distributed data fusion based CSP in DWSNs can track the 3-D positions of targets quickly and accurately,and decrease the congestion,energy consumption and time latency in communication.关键词：distributed wireless sensor networks;collaborative signal processing;target tracking;data fusion2|1182|4更新时间：2025-07-16
- 摘要：This paper proposes several improved CMOS analog circuits for neuro-fuzzy network,including Gaussian-like membership function circuit,minimization circuit,and a centroid algorithm defuzzier circuit without using division.A two-input/one-output neuro-fuzzy network composed of these circuits is implemented and testified for non-linear function approximating.All the circuits have been fabricated in SMIC 0.18- μ m CMOS technology.Experiment results show that all the proposed circuits provide characteristics of high operation capacity,high speed,and simple structures.They are very suitable for rapid implementation of high-speed complex neuro-fuzzy networks.关键词：neuro-fuzzy network;CMOS analog circuit;centroid algorithm2|776|0更新时间：2025-07-16
- 摘要：This paper defines a D-vector and D-matrix,based on which a new ensemble of LDPC code,called as D-LDPC codes,is developed.We discover that the D-matrix has the characteristics of orthogonality and circular-shift,by means of which we construct sparse parity-check matrix based on algorithm sequence.Studying shows that the D-LDPC codes has many advantages,such as the performance of the D-LDPC code is as same as,or in some extent,much better than convolution codes at the condition of middle and low code length and 1/2 code rate;the complexity of the algorithm to encode a D-LDPC code is O(M) which is lower than O(N) of the complexity for the convolution codes;the D-LDPC code has high flexibility concerning design of code length and code rate,which makes it compatible with the existed standard.关键词：low-density parity-check code;encoder;parity-check matrix;algorithm sequence3|1455|3更新时间：2025-07-16
- 摘要：A distributed amplifier (DA) basing on 0.5 μ m GaAs PHEMT process has been developed.The DA has a measured -3dB bandwidth close to 20GHz,with a transimpedance gain of 46dB Ω .Both the input and output voltage standing wave ratios (VSWR) are less than 2 in the range of 50MHz~16GHz.The noise figure (NF) varies from 3.03 to 6.5dB,whilst the average equivalent input noise current density is about 14.6pA/ Hz .With a timing jitter of 12ps and eye amplitude about 166mV,the measured output eye diagram for 10Gb/s NRZ pseudorandom binary sequence (PRBS) is clear and satisfying.关键词：GaAs PHEMT;distributed amplifier;bandwidth;noise figure;eye diagram2|1576|3更新时间：2025-07-16
- 摘要：To solve the problems such as low performance and high resource cost,which exist in current implementations of encryption algorithms based on reconfigurable computing technology,this paper presents a method that implements the encryption algorithms by using partial reconfiguration.This method implements a block cipher algorithm which has involutional structure by using module-based partial reconfiguration technology of Xilinx FPGA,and gives the solutions to the key technical issues such as cooperation between modules,communication channels design and timing adjusting scheme.The comparisons in the experimental results of this method with those of others demonstrate the effectiveness of this method.关键词：partial reconfiguration;block cipher;modular design;involutional structure2|631|0更新时间：2025-07-16
- 摘要：Clustering is inherently a difficult problem,with respect to both construction of adequate objective functions and optimization of the objective functions.In this paper,we propose a novel objective function called the Fuzzy Weighted Sum Validity Function (FWSVF),which is a merged weight from the several fuzzy cluster validity functions,including XB,PE,PC and PBMF.The new validity function has more efficient quality than old ones.Furthermore,we present a Mixed Strategy Evolutionary Clustering Algorithm (MSECA),which is merged from Mixed Strategy Evolutionary Algorithm and Fuzzy C-means Algorithm and could be applied to optimization of FWSVF. The improved validity function could improve the confidence of clustering solutions and achieve more accurate and robust results.Moreover,MSECA could automatically evolve the proper number of clusters as well as appropriate partitions of the data set,and avoid local optimum.In the experiments,we show the effectiveness of MSECA.In comparison with other genetic clustering algorithms,the MSECA can consistently and efficiently converge to the best known optimum corresponding to given data in concurrence with the convergence result.关键词：fuzzy C-means algorithm;evolutionary algorithms;cluster validity;mixed strategy2|746|3更新时间：2025-07-16
- 摘要：The performance of 802.11DCF-based ad hoc networks deeply relies on the complex interaction between medium access mechanism and routing scheme.In this paper,we model the interaction and present the method for computing upper and lower bounds of the optimal end-to-end throughput for a given path in the ad hoc networks.Different from the previous researches,we work with a more realistic scenario:the packet is scheduled arbitrarily and the carrier sense range of a node is longer than its transmission range.Furthermore,we analyze other affecting factors in depth,such as multiple routing and packet-drop.Some different and interesting conclusions are drawn from our path-oriented analysis.We believe that the conclusions can be helpful guidelines for upper level applications and routing design.关键词：802.11 DCF;wireless multi-hop networks;cross-layer interaction;path-oriented analysis;end-to-end throughput2|1770|1更新时间：2025-07-16
- 摘要：One challenging issue in IPv6 high speed routers’ design is the multi-field classification at line-rate for interface OC-192 and beyond.This paper proposes an efficient ultra-high speed IPv6 packet classification engine (classifier) based on TCAM (Ternary Content Addressable Memory).The key ideas are:(1) encoding the five fields according to their distinct features:we compress the IPv6 source/destination address fields based on the features of their formats and the distribution styles,apply an extended hierarchical coding method to TCP source/destination port fields and encode the protocol field based on the statistics.In this way,the original five-tuple with 296-bit length is converted into a 280-bit one which can fit well into the configured width of existing commercial TCAMs;(2) an embedded SSRAM table search technique is adopted to independently encode the five fields in parallel,eliminating the encoding bottleneck and guaranteeing the line-rate processing;(3) The rules of the classifier are stored in TCAMs according to the pre-designed coding formats.Utilization of pipeline makes the field coding operation and the rule’s search running parallel,which results the classifier outputting a search result within a single TCAM access.What’s more,to effectively solve the range matching problem,we present a dynamic range encoding scheme which greatly reduces the storage requirement for TCAMs and increases the updating speed.Analysis and simulation demonstrate that running TCAMs at a frequency of 66MHZ( relatively low),the engine can reach a speed of over 22M packets per second (Mpps) for both the lookup and the packet classification respectively when integrated,and this perfectly satisfies the OC-192 interface’s line-rate processing.关键词：IP packet;IPV6;TCAM;multi-field packet classification;coding2|1101|2更新时间：2025-07-16
- 摘要：This paper describes a robust glottal source estimation method based on a joint source-filter separation technique.In this method,the glottal flow derivative is modelled as the Liljencrants-Fant (LF) model and the vocal tract is described as a time-varying ARX model.Since the joint estimation problem is a multi-parameter nonlinear optimization procedure,we separate the optimization procedure into two passes.The first pass initializes the glottal source and vocal tract models providing robust initial parameters to the following joint optimization procedure.The joint estimation determines the accuracy of model estimation,which is implemented with a trust-region descent optimization algorithm.Experiments with synthetic and real voices show the proposed method is a robust glottal source parameter estimation method with a considerable degree of accuracy.关键词：speech production model;source-filter model;glottal flow derivative;ARX;glottal source estimation;joint optimization2|1236|3更新时间：2025-07-16
- 摘要：PMC model is a kind of system-level fault model based on test.To counter the weakness in traditional diagnosis algorithm,we have set up a framework of equation diagnosis algorithm for PMC model in 2003.The chief works in this paper are as follows:(1)The past theorem is further replenished and complemented;(2)A simple and convenient method for directly getting absolute fault base is given;(3)By introducing the concept of direct sum,more dimensions PMC fault models are separated into less dimensions models to diagnosis;(4)Equation diagnosis algorithm’s applications are illustrated by examples.关键词：system-level fault diagnosis;PMC fault model;equation diagnosis algorithm;consistent fault pattern;t-diagnosable2|671|8更新时间：2025-07-16
- 摘要：This paper presents a learning cerebellar model to control reaching movements of a simulated biomimetic manipulator.Utilizing the servo mechanism of the spinal reflex circuitry,the model embeds a neural network based on known cerebellar circuitry in a simulation of the mammalian motor control system to control a 6-muscle 2-link planar arm.The system had implemented a biologically version of the parallel hierarchical control model proposed by Katayama and Kawato and was proved to be able to learn accurate trajectory control.The simulation results demonstrate that this cerebellar model was able to learn parts of the inverse dynamics model not provided by the PDF＋F controller,and having nicer tracing performance of desired trajectory.关键词：cerebellar model;biomimetic manipulator;simulation3|704|0更新时间：2025-07-16
- 摘要：Recent research in neuroscience has proposed a new artificial neural networks model,the pulse coupled neural networks,PCNN.Several PCNN structures for image processing have been proposed depending on the model’s potential.In the research of the theories and the applications of PCNN,it isn’t a trivial task to define the relative parameters properly,and people usually get the values by experience with many experiments.As a contribution to this research field,this paper presents a new method for image processing based on the image histogram of gray-level and amount of information.The histogram is used as a new tool to describe the image features and furthermore to define the decay time constant of PCNN.With this new algorithm,we can get perfect segmentation result with the fewest iteration times only in one computation period of PCNN,and also can resolve the problem in image segmentation that it is liable to loss some object while many objects exist.Experiments show that the new algorithm has good performance in image processing.关键词：image segmentation;PCNN;gray-level;amount of information;histogram2|1260|9更新时间：2025-07-16
- 摘要：A novel multi-packet reception scheme in wireless sensor networks (WSN) based on network-assisted diversity multiple access (NDMA) is proposed,which exploits cooperative diversity to overcome multi-path fading and selects relay nodes according to the characteristics of WSN and full-rank requirements of channel matrix using cross-layer methods.During the slots following the collision,a set of nodes designated as relays will cooperate with source nodes and destination node to form virtual antenna array and retransmit the signals that they received during the collision slot.The proposed scheme can effectively limit retransmission times and achieve higher throughput than slotted ALOHA and other NDMA methods.Simulation results validate the proposed scheme.关键词：Wireless sensor networks;cross-layer;cooperative diversity;multi-packet reception;network-assisted diversity multiple access2|784|1更新时间：2025-07-16
- 摘要：As an extension of BLP in local area network,L-BLP model was developed to enforce information confidentiality in distributed network environment.It can control communications between subjects by adding dynamic monitor units into system,defining system topology and constructing new state transition rules.Analyses prove the security of L-BLP model and show that it can solve information confidentiality problems.关键词：computer network security;BLP security model;access control2|1101|8更新时间：2025-07-16
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