最新刊期
卷 33 ， 期 5 ， 2005
- 摘要：The protocols for Yao's Millionaires' problem have been building blocks of solutions to many secure multi-party computation problems.But known solutions are not efficient enough and thus affect the efficiency of many secure multi-party computation protocols.In this paper,we construct a new efficient solution to millionaires' problem based on length function and oblivious transfer.Compared with known solutions,our new solution has much less computational complexity.关键词：millionaires' problem;secure multi-party computation;oblivious transfer;computational complexity2|1853|25更新时间：2025-07-16
- 摘要：The ideas of simulating directed Hamilton path problems by splicing systems are showed;then some properties of directed graphs are presented based on the analysis of directed Hamilton path problems according to the properties of languages generated by the splicing systems.In our construction,the splicing systems simulating problems run at most n-2 steps,where n is the size of problems.关键词：DNA computing;splicing system;directed Hamilton path problem2|1076|1更新时间：2025-07-16
- 摘要：This paper concern the issue of signal characteristic and imaging processing of missile-borne side-looking SAR during its descending flight.According to the flight speciality of missile,the geometric model and target range expression are built.The features of range variation with time in single aperture and Doppler parameter variation with operation time are analysed.Because of the altitude decreasing during SAR operation,Doppler parameters change notably and constant Doppler parameters are not suitable for the imaging processing of entire operation period.Analysis and simulation show that focused image can be obtained by employing sub-aperture processing.关键词：missile borne SAR;signal analysis;imaging processing2|2862|29更新时间：2025-07-16
- 摘要：For VLSI designs under deep submicron technology,it is well known that interconnect delay has become dominant factor in determining the overall circuit performance.Buffer insertion is an efficient technique for interconnect optimization.This paper presents an algorithm of routing and inserting buffers simultaneously to reduce wire delay for a two-pin net under fixed buffer locations based on accurate delay models.Given a two-terminal net,the algorithm can not only minimize the total delay time of the net,but also minimize the number of buffers inserted to meet a given delay constraint,thus avoid needless power and area cost.关键词：buffer insertion;interconnect optimization;layout;VLSI2|1104|1更新时间：2025-07-16
- 摘要：The orthogonal experiment design method was applied to study the relationships between solder joint process parameters and reliability of plastic ball grid array (PBGA) component.By using a L18(2×37) mixed-level orthogonal array,the PBGA test vehicles which have 18 different process parameters' combinations were designed firstly,and then the accelerated thermal cycling test of PBGA test vehicles,which lasted 546 hours with 2140 cycles,was carried out subsequently.Based on the test results,the range analysis and the variance analysis were performed,the failure distribution of PBGA test vehicles was also characterized by using two-parameter Weibull distribution,finally,the stress and strain distribution within the PBGA solder joint under thermal cycles were studied by finite element analysis.The thermal cycling test results show that the cracks of failure solder joints occur at the interface between the solder joints and the bismaleimide-triazine(BT)substrate.The results of study show that specification size of PBGA component has a significant effect on the reliability of solder joints,the chip weight has a certain effect on the reliability,whereas the diameter of pad and the thickness of stencil have little effect on the reliability.The best combinations of process parameters are S2D2G2M1 and S2D2G2M2.The finite element analysis indicates that the maximum stresses of PBGA component under thermal cycles occur at the interface between the solder joint and the BT substrate.The solder joint cracks should be initiated at the interface and then propagate laterally through solder joint.The finite element analysis results are in good accord with the experimental results.Some results of this work have been applied in practice to assemble the PBGA component.关键词：orthogonal experiment;ball grid array;solder joint;process parameters;reliability;finite element analysis2|1350|4更新时间：2025-07-16
- 摘要：This paper proposes a novel algorithm about image segmentation based on the vision lateral inhibition model and statistics of consecutive fields.The algorithm simulated the mechanism of the retina model of human eyes.First it picked up the variance information in the image,and then used level secant to cut the histogram from bottom to top.The algorithm counted the consecutive fields on every secant and compared each secant position and consecutive field numbers,and then made a consecutive curve.It can be proved that the secant corresponding to the curve's peak contains the boundary of the biggest consecutive field,which is the optimized threshold.The algorithm is very effective and robust.It is not only well adaptive to the change of brightness and contrast,and also can be applied to much complex background.It can improve the connectivity of strokes and lines.The result of segmentation is well coincident with the vision feeling of human eyes and the main reasons are discussed.关键词：image segmentation;vision model;lateral inhibition;consecutive field2|1317|2更新时间：2025-07-16
- 摘要：Errors tolerance is a very important problem in simplifying triangulated surface model.An effective method to find tolerance errors is to use the whole inner and outer envelopes of a triangulated surface model.However,there will be many complicated operations to compute intersections between triangulations when constructing the whole inner and outer envelope of a triangulated surface model,which will lower the algorithm efficiency.We introduce a novel algorithm for simplifying triangulated surfaces model using the part offset-patches as errors tolerance,which are constructed by offsetting a part of triangles on the surface and can also be regarded as a small part of the whole inner and outer envelopes.Because the part offset-patches are much smaller than the whole inner and outer envelopes of a triangulated surface model,our algorithm is both simple and easy to implement.We also have developed a software system to test our algorithm.Experiment results show expense of our algorithm is much less than that in the algorithm using the whole inner and outer envelope of a triangulated surface model and it keeps higher similarity between simplified model and original one.关键词：triangulated surface model;simplification;part offset-patch;error control2|1223|2更新时间：2025-07-16
- 摘要：By paying attention to tussle's impact on the research of network architecture,a set of design principles for constructing new generation network architecture are summarized in this paper,and then an interaction based,service oriented model of network architecture,INSA,is proposed under the direction of those design principles.Furthermore,the design thinking,general characteristics and formal modeling techniques of INSA model are described and discussed.Maintaining the openness,simplicity and flexibility of the traditional Internet,the INSA model introduces the manageability,controllability,customizability,evolvability and reusability into the new generation network architecture.So it provides good guidance for the research and development of the next generation network.关键词：network architecture;next generation network;tussle;design principle;component concept2|1541|9更新时间：2025-07-16
- 摘要：We propose an engineering approach to creating 3D models of outdoor scenes from laser range data and visual image data.According to the features of TH-3DLCS-2001 Scanner which can capture the 3D geometry and texture data synchronously,we deduce the formulas of registration between laser points and visual points,and give the RGB values of each laser points.We propose a fast registration algorithm of multiple range images based on the reverse projections,and all range images are aligned into a common coordinate system.Using the Hough Transform and Fuzzy theory,we classify the outdoor scene into six major groups including roof,wall,window,ground,tree,and others,and give a triangulation algorithm.This proposed method has been applied to the 3D reconstruction of some outdoor scenes;the results show that this method can be able to solve the basic problems of 3D reconstruction of outdoor scenes from laser range data and visual image data.关键词：synchronized laser and visual data;registration;segmentation;texture mapping;3D modeling2|2663|10更新时间：2025-07-16
- 摘要：Key generation plays an important role in a cryptosystem.Its security is significant for the security of the whole cryptosystem.In situations such as group oriented cryptography,group secret communication and electronic commerce,distributed key generation are needed.The problem of distributed key generation based on vector space access structures is studied.On the foundation of an information theoretic secure verifiable secret sharing scheme over vector space access structures,a secure and efficient distributed key generation protocol over this kind of access structures is presented.Compared to the existing distributed key generation protocols based on threshold access structures,the new protocol has a wider range of applications.关键词：key generation;distributed key generation;group oriented cryptography;verifiable secret sharing;vector space access structure2|1186|0更新时间：2025-07-16
- 摘要：Being confronted with the trust crisis under the Internet environment,people have endeavored to develop technologies for supporting and measuring trust.Basically,traditional models and mechanisms seldom studied trust from the perspective of the trust itself and most of them can only deal with trust on a single aspect.Those traditional approaches cannot manage or support trust in consistent ways when systems are required to be in possession of multiple trust properties.Regarding software services in the Internet environment as the investigating entities,this paper is devoted to build uniform view for multiple trust properties.Firstly,a trust management model based on middleware is built.Secondly,based on the model,a trust management framework is built,which is customizable and extendable.Thirdly,by analyzing various trust properties deeply,a viable trust-measuring model is setup.At last,the framework is implemented on the top of a middleware platform,i.e.,the PKUAS.This paper also compares our research with the related work.关键词：trust computing;trust support;trust metric;middleware2|1064|5更新时间：2025-07-16
- 摘要：Although Statecharts have gained widespread use as a formalism for modeling reactive real-time systems,testing these systems still confronts some difficulties,of which a major one is the existence of numerous system behaviors.It is extremely difficult to conduct comprehensive and in-depth testing of such real-time systems.This paper presents an approach to property-oriented real-time testing.Necessary real-time extensions are proposed such that the time-enriched Statecharts can describe non-trivial timing constraints.The properties to be tested are characterized by a restricted real-time logic.Then the targeted test sequences are derived from the real-time models according to the user-specified properties.Using this approach,testing efforts can be focused on particular properties of the real-time systems and usually only a small portion of the total behaviors needs to be tested.关键词：software testing;real-time system;UML Statecharts;temporal logic;test sequence2|1155|2更新时间：2025-07-16
- 摘要：A new unicast rate-based TCP-Friendly protocol called RAAR (Rate Adaptation at Receivers) is proposed.RAAR is a rate adaptive algorithm at receivers.It applies GAIMD (General Additive Increase Multiplicative Decrease) policy for congestion control and doesn't need to feed back per packet received.In RAAR,almost all complex operations of traffic control are carried out at receivers.A simple mathematical model is constructed to analyze the throughput of RAAR and get the relationship of α and β in RAAR for AIMD(Additive Increase Multiplicative Decrease)TCP-Friendly congestion control.Comparing with two important TCP-Friendly protocols,TFRC and TEAR,results are that RAAR has better performance in TCP-Friendliness,intra-protocol fairness and smoothness.RAAR is also a promising avenue of development for congestion control of multicast traffic,since it is not a per-packet acknowledgement and is mainly implemented at receivers.关键词：RAAR;TCP-Friendly;GAIMD;congestion control2|1206|7更新时间：2025-07-16
- 摘要：With further research on the network congestion control,many flow control theories and network models have appeared.Based on fluid flow theory,Misra developed a dynamic model of the TCP congestion window in 2000,which has been accepted by many researchers.However,some flaws are inevitable due to its approximation in the model evolvement.This paper gives a detailed analysis of its shortcoming from both the theory and experimental results.Then it presents an improved model.Based on this model,a new PID(Proportional Integral Differential) and PID-like controller design method is applied to AQM controller.Experimental results show that this algorithm outperforms other algorithms.关键词：network model;congestion control;active queue management;PID control;large delay;D stability2|1250|4更新时间：2025-07-16
- 摘要：With the rapid development of networks and applications,Internet is required to not only provide the Best Effort service,but also supply services of various traffic classes and multiple priorities.DiffServ architecture is considered to be the promising Internet framework meeting QoS requirements.One of crucial elements in DiffServ is the network node scheme.In this paper,we propose a novel DiffServ node mechanism called combining Buffer Management and Active Queue Management (comBAQ).We detail comBAQ service framework and its packet judgment process.Simulation results demonstrate that comBAQ is capable of simultaneously achieving our five targets and provides service differentiation in terms of packet drop priority:the More Guaranteed (MG) service for reliable traffics and the Less Guaranteed (LG) service for traditional application flows.关键词：DiffServ;buffer management;dynamic thresholds;active queue management2|1086|1更新时间：2025-07-16
- 摘要：After expounding the importance of regarding synchronization segments as minimal units during load monitoring and balancing of OpenMP programs,this paper proposes a load monitoring method and balancing strategy at source level of OpenMP programs for synchronization segments.In this paper,the load monitoring method for synchronization segments is based on unfolding hidden synchronization operations,which is easy to implement and to determine efficient monitoring regions.After obtaining information about load distribution,load balancing is implemented through performance evaluation,choosing,load scanning and adjustment for synchronization segments,which is different from existent OpenMP performance tools.In this process,the load balancing strategy is able to choose those synchronization segments needing load adjustment according to weighted residual efficiency,to scan their load distribution under various scheduling schemes and ultimately to determine proper load scheduling strategies for them.The actual test results indicate that the load monitoring method and balancing strategy for synchronization segments is feasible.关键词：OpenMP;synchronization segment;load monitoring;load balancing2|1293|1更新时间：2025-07-16
- 摘要：An algorithm for computing the linear spans of GMW sequences was studied and simplified in this paper.Then we get a new method which can obtain GMW sequences with largest linear spans for a certain periods.Using this method,engineers can get ideal GMW sequences in a short time without mastering much mathematic knowledge.These sequences can make the spread spectrum multiple access communication systems have optimal performance.关键词：Gordon-Mills-Welch(GMW) sequences;trace function;linear span2|1029|0更新时间：2025-07-16
- 摘要：Based on the Kalman filtering method and white noise estimation theory,under linear minimum variance information fusion criterion weighted by matrices,a multisensor information fusion white noise deconvolution filter is presented for systems with correlated noises.The formula of computing covariances among filtering errors of sensors is presented,which can be applied to compute the optimal fused weighting matrices.Compared to the single sensor case,the accuracy of fused filtering is improved.It can reduce the on-line computational burden,and is suitable for real time applications.It can be applied to signal processing in oil seismic exploration.A simulation example for 3-sensor information fusion Bernoulli-Gaussian white noise deconvolution filter shows its effectiveness.关键词：correlated noises;optimal information fusion;reflection seismology;deconvolution;white noise estimators;Kalman filtering method2|1155|1更新时间：2025-07-16
- 摘要：Watermark detection is one of the most important steps in digital watermarking.It has traditionally been tackled using correlation-based techniques.However,correlation-based detection is not the optimum choice since it does not utilize the distributional characteristics of the host media.In this paper,by applying generalized Gaussian distributions to statistically model the AC DCT coefficients of the original image,a DCT-domain watermark detection scheme based on local optimum detection is proposed.The performance of the new detector in terms of the associated probabilities of detection and false alarm is analyzed.The experimental results support the theoretical performance analysis,and confirm the superiority of the novel detector at the same time.关键词：digital watermarking;Generalized Gaussian Distribution;local optimum detection2|1053|6更新时间：2025-07-16
- 摘要：We give a novel chaotic neuron model whose activation function is composed of Gauss and Sigmoid function.It is shown that the model may exhibit a complex dynamic behavior.The most significant bifurcation processes,leading to chaos,are investigated through the computation of the Lyapunov exponents.Based on this neuron model,we propose a novel chaotic neural network,which realizes simulated chaotic anneal by decaying two parameters simultaneously.Transforming the feature points matching problem into the optimization problem,the network can complete the function of the object recognition.The simulation results prove the validity of the algorithm.关键词：chaos;neural network;optimization;feature points matching2|1685|8更新时间：2025-07-16
- 摘要：Single sideband optical modulation in radio over fiber system is implemented simply and effectively by the narrow-band fiber Bragg grating to decrease the dispersion penalty in long-distance transmission.The effect of double sideband on the performance of radio over fiber system is theoretically analyzed,and the requirements of single sideband filtering to reflective spectrum and reflectivity of narrow-band fiber Bragg grating are discussed.Using the narrow-band fiber Bragg grating based sideband modulation,the improvement of transmission performance of radio over fiber system with several different modulation formats,modulation speeds,and transmission distances is investigated.The experiment results show that the signal noise ratio is enhanced about 4dB on double sideband modulation in the 25 km 15GHz radio over fiber system with 16QAM modulation.关键词：microwave photonics;radio over fiber system;single sideband modulation;fiber bragg grating3|1161|4更新时间：2025-07-16
- 摘要：A model of Three Dimensional (3-D) shape of solder joint in optical fiber attachment soldering and the energy boundary condition were established.The 3-D shape of solder joint was predicted by employing Finite Element Method (FEM),and the influence of various factors,which include material and manufacture parameters,on 3-D shape of solder joint was discussed.Based on the minimum potential energy theorem and the data from shape simulation,the influence of solder volume and pad size on the stand-off height (SOH) between optical fiber and pad was analyzed,the effects of y-offset on the restoring force were investigated.The results show that the minimum stand-off height increases linearly with the increase of solder volume for certain pad size when solder volume is larger than the critical value.The restoring force increases linearly with the increase of y-offset when the y-offset is smaller than certain value.The above results are of great importance and can be used to control the offset of alignment by modifying the design and manufacture parameters.关键词：optical fiber attachment soldering;3-D shape of solder joint;simulation2|872|0更新时间：2025-07-16
- 摘要：The transmission of optical signal under the effect of dispersion and nonlinearity is investigated by small signal analysis.Frequency domain transfer function (FDTF) is given which include loss,dispersion,self phase modulation (SPM) and cross phase modulation (XPM) and reflects XPM process.The analytical method to determine the time domain shape of probe wave when arbitrary pump wave is inputted is confirmed in intensity modulation direct detection system.We find that the SPM in pump channel increases FDTF to some extent and the increased extent is enhanced with the increase of modulation frequency,average power of input signal and transmission distance.The analytical result agrees well with numerical simulation.关键词：nonlinear optics;frequency domain transfer function;self-phase modulation;cross-phase modulation;group velocity dispersion3|846|0更新时间：2025-07-16
- 摘要：The paper studies the protection design with link shared for the double-link failures in WDM mesh networks,and proposes a novel heuristic algorithm called TBP (Two Backup Paths) and an improved heuristic algorithm called OBP (One Back Path).The two algorithms both can dynamically adjust the link-cost according to the current state of the network,so that the paths are all the least-cost routes.The paper also investigates the protection switching procedure and calculates the formula of the protection switching time.The simulation results show that,1) the two algorithms both can effectively protect the double-link failures; 2) TBP performs better than OBP; 3) with respect to other algorithms,TBP has the fastest protection switching time.关键词：wavelength-division-multiplexing (WDM);double-link failures;link shared protection;failure recovery2|905|0更新时间：2025-07-16
- 摘要：In resent years,mobile ad hoc networks are a new emerging field with its potential applications in extremely unpredictable and dynamic environments.However,it is particularly vulnerable due to its features of open medium,dynamic changing topology,cooperative routing algorithms.The article surveys the state of the art in security for mobile ad hoc networks.Firstly,we analyze various possible threats to security in mobile ad hoc networks.Secondly,we illustrate representative solutions to deal with those threats,including key management,intrusion detection and cooperation enforcement.We also make a comparison and discussion of their respective merits and faults,and propose some ways to fix these problems.Finally,we also present the challenges which are still worth to further research in the area.关键词：network;security;mobile ad hoc networks;key management;intrusion detection;cooperation enforcement2|2808|24更新时间：2025-07-16
- 摘要：In distributed systems,some traditional association rules mining algorithms have been developed with all original data being gathered into a centralized site.However,these algorithms are not fit for the situation where no user is willing to disclose his information.In the privacy preserving association rule mining problems,there are several participants engaged in the computation and the algorithms are run on the union of their databases.Currently,the secure union algorithm can be used to protect each user's privacy if all the user's databases have the same structure.However,in secure union algorithm,each participant should encrypt all the participants' data.So,if there are many participants engaged in the cooperative computation,this method is inefficient.Thus,in this paper,we introduce a data disguised method for privacy preserving association rule mining based on the randomized response techniques,present the mining algorithm on the disguised item set and analyze the complexity of this algorithm.The experiments show that the rule that this algorithm gets has fewer relative error which is less than 2% compared with the original rules.We also give some values of the parameters which make the relative error is the lowest.关键词：data mining;association rule;randomized response2|1226|16更新时间：2025-07-16
- 摘要：The MCP electron transmission film in low-level-light imaging tube and its process techniques were introduced in this paper.The electron and ion transmittance of this film was studied.The concept of dead voltage of MCP with film was discussed.The dead voltage curve,and the relation between dead voltage and thickness of film were tested.The results of performance testing comparisons were presented.The composition of film was analyzed by XPS.Through theoretical analysis of ion transmittance characteristics for MCP electron transmission film,we proposed the concept characterized the inhibition ability of film from ion transmitting,testing theorem and related techniques for ion transmittance measuring.关键词：microchannel plates;electron transmission film;without pollution film forming process;dead voltage;ion transmittance3|1422|3更新时间：2025-07-16
- 摘要：The design,fabrication and test results of surface acoustic wave resonators in the GHz range are described.The two different modes of SAW resonators were investigated.They are the Rayleigh mode type resonators and surface transverse wave (STW)mode type resonators.Their frequency behavior with temperature were compared.At the end the applications of the STW resonators in oscillators were studied.关键词：surface acoustic wave resonators;RayLeigh-wave;surface transverse wave2|1510|2更新时间：2025-07-16
- 摘要：The paper resolved a two-dimensional partial differential equation of transverse piezoresistive effect transducers with a method of perturbation.A relationship between the output voltage and device size has been gotten.We also verify that the maximum output voltage is located at middle point of output terminal.An expression of the maximum output voltage has been given.The calculation results based on the expressions are fit to numerical and experimental values of devices.It shows that the analysis model we have gotten is right.These expressions based on the paper can be used in design and simulation of four-terminal piezoresistive pressure transducers.关键词：four-terminal silicon pressure transducer;normal perturbation;analysis expressions2|783|0更新时间：2025-07-16
- 摘要：Due to conducted or radiated EMI from inner or outer coupling circuits,breathing can exist in current-mode controlled Boost converter.It exhibits as a time-bifurcation undergoing regular period-1,subharmonics and chaos orderly and repeatedly for a long period.The breathing,as an improper operation state,should be avoided in power converters.By constructing an interference signal with the same frequency as the Boost converter and constant initial phase,time-bifurcation (breathing) will be mapped into parameter-bifurcation.In this way,breathing can be explained and analyzed from the viewpoint of bifurcation control.Furthermore the theoretical design principles insuring stable operation of converter are concluded.Simulation can gain the same results as those from experiment,and those from analysis as well.关键词：current-mode controlled Boost converter;breathing;subharmonics;chaos;bifurcation;time-bifurcation2|1365|15更新时间：2025-07-16
- 摘要：A series of microcrystalline silicon thin films prepared at different substrate temperature (Ts) by very high frequency plasma enhanced chemical vapor deposition were analyzed by Micro-Raman spectroscopy,Fourier transform infrared spectroscopy and photo thermal deflection spectroscopy.The results showed that structure of sample evaluated from amorphous to microcrystalline and hydrogen content decreased with the increase of Ts.Microcrystaline silicon thin films prepared between 200℃ and 250℃ indicated low defect density.Microcrystalline silicon solar cells with convertion efficiency 7.1% was fabricated by VHF-PECVD.There was no ZnO back reflector and thickness of solar cell was only 1.2μm.关键词：very high frequency plasma enhanced chemical vapor deposition;microcrystalline silicon;substrate temperature(Ts)2|1007|0更新时间：2025-07-16
- 摘要：The rapid advance in communication technology brings a request for cryptoprocessors of higher performance.In the design of the RSA modular exponentiator,the Montgomery modular multiplication algorithm and the right-to-left binary method are used and modified considering large-bit modular multiplication and VLSI implementation.A Carry Save Adder structure is used in the modular multiplier,to avoid the long carry propagation.We propose a Signal Multi-Backup strategy to resolve the problem of large loads that are caused by the signal broadcasting of large-bit operation structures.关键词：Montgomery algorithm;modular multiplication;modular exponentiation;RSA;public-key cryptography2|1930|6更新时间：2025-07-16
- 摘要：A new integrated arrayed 4 quadrants CMOS photo-electric sensor used for target coordinate obtaining and target tracking is designed and fabricated in a 0.6μm standard CMOS process.It realizes the single chip integration of the quadrants sensor and subsequent signal processing circuits.It consists of 16×16 active photodiodes(PD) array,correlated double sampling (CDS) circuits and digital control part.The area of each active PD is 60μm×60μm and the fill factor is 64.5%.The dynamic range (DR) of the sensor can be enlarged with reset frequency adjustment double scanning method.As a result,84dB DR can be obtained.The sensitivity of sensor can be 2V/lx·s and the sensor operation speed can be 2ms/frame~64ms/frame according to illuminance intensity.关键词：arrayed quadrant sensor;CDS;CMOS photoelectric sensor;dynamic range adjustment;double scanning2|1124|2更新时间：2025-07-16
- 摘要：With respect to the Multiple-Input Multiple-Output (MIMO) architecture under the frequency-selective fading environment,this paper introduces the Direct-Sequence Spread-Spectrum (DSSS) operation into each transmit-antenna branch so as to make the frequency-selective fading channel vectorizable.Successively,one novel labeled-delay transmit diversity scheme is proposed for the DSSS-MIMO architecture,and the corresponding blind estimation scheme of the frequency-selective wireless channels is also derived.Simulation results demonstrate the validity of the novel labeled-delay transmit diversity scheme and the performance of the blind estimation of frequency-selective channels.关键词：frequency-selective;MIMO;DSSS;labeled-delay transmit diversity;blind estimation2|911|1更新时间：2025-07-16
- 摘要：The motion estimated from tennis video is unable to analyze player's true movement due to the diagonally located camera and the high noises.In this paper,a transform algorithm of Motion Vector Field (MVF) is proposed to revise the deformed motion vector based on the pinhole camera model.In this algorithm,the techniques of foreground object mask and global motion compensation are incorporated to reduce noises.Previous methods based on MVF analysis are further utilized to recognize basic actions of either tennis player.And,the experiments on live broadcasted tennis videos show very encouraging results.关键词：tennis video analysis;transform algorithm of motion vector field;pinhole camera modeling2|1259|1更新时间：2025-07-16
- 摘要：One useful perspective on machine learning and target recognizing is that they involve effectively and rapidly searching some very large sample space to determine one that best fits the observed data and trained samples.If the independent identical distribution (i.i.d) property of pattern samples of complexity background is not satisfied,statistic theory is of no effect.In this paper,a method on producing RSOM pattern recognition tree is proposed,in which the hierarchy model,SOM neural net algorithm and recursive technique are utilized.This is a basic model of pattern recognition in machine learning.The validity of this method is proven by testing lots of common data sets and practical application in radar target recognition system.关键词：pattern recognition;classification tree;neural net;SOM;RSOM;machine learning2|1551|2更新时间：2025-07-16
- 摘要：With the relationship between the antibody concentration and the degree of illness in the human immune system,a real-time method of risk evaluation for network security based on artificial immune system is proposed.Self,nonself,antibody and antigen are defined.Thus clone selection,learning scheme and lifecycle of antibody are built.A quantitative computation model based on the concentration of the antibodies for computer network security has thus been presented.The experiment shows that this method has the features of quantitative calculation and real-time process ability,and is a good solution for real-time risk evaluation for network security.关键词：artificial immune;network intrusion detection;risk evaluation2|1566|15更新时间：2025-07-16
- 摘要：This paper provides a novel neural networks algorithm (NNA) for the design of 2-D FIR linear-phase digital filters with arbitrarily shaped amplitude-fresquency responses,the main idea is to minimize the squared-error function in the frequency-domain.By using the NNA,the coefficients of the designed filter can be obtained directly from the specified amplitude-frequency response.The convergence theorem is presented and proved to illustrate the stability of the NNA.The result of the optimal design example show that the ripple of the filter is tiny,and the proposed approach is of fast convergence and powerful stability.关键词：2-D digital filters;linear-phase;neural network;convergence theorem;optimal design2|947|0更新时间：2025-07-16
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Comparison of Biomimetic Pattern Recognition, HMM and DTW for Speaker-Independent Speech Recognition
摘要：The purpose of this paper is to compare the performance of three speech recognition methods,one based on Biomimetic Pattern Recognition (BPR) and the other two based on Hidden Markov Models (HMMs) and Dynamic Time Warping (DTW) respectively.As a general purpose model of pattern Recognition,BPR is realized by Multi-Weights Neuron Networks.For the 15 words vocabulary,we analyze the false recognition rate (ratio of accepting a trained word to another trained word) and false acceptance rate (ratio of accepting an untrained word to a trained word) respectively.Experiment results show that when the training data was not sufficient,the manner of BPR achieved a higher performance.关键词：biomimetic pattern recognition;multi-weights neuron;speech recognition;hidden markov models;dynamic time warping2|1252|8更新时间：2025-07-16
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