最新刊期
卷 32 ， 期 10 ， 2004
- 摘要：In this article,we investigate an implementation scheme of virtual-optics based data encryption system.With such a scheme,we make use of a high performance floating-point Digital Signal Processor (DSP) to accomplish a design of multiple-locks and multiple-keys multimedia information hiding system.This scheme balances the advantages of higher security strength in the methodology of optical data processor and the high flexibility in the methodology of electronic data processor.The scheme reported in this article can be applied to the data encryption for various digital media such as text,image,or even audio signal.关键词：virtual-optics;encryption/decryption;DSP;parallel processing;software pipeline2|950|3更新时间：2025-07-16
- 摘要：Traditional blind identification methods for SIMO channels,such as subspace method (SS),etc.,are based on the eigen value decomposition (EVD) or singular value decomposition (SVD) of the received signal's correlation matrix,which may need more data to make the estimation of correlation matrix be accurate.Recently a QR factorization based blind identification algorithm for SIMO channels with good performance and without calculating the correlation matrix is proposed.In this paper,we extend the QR factorization based algorithm for the blind identification of MIMO channels,and we then proved the extended algorithm to be valid for a more generalized case,that is,the source signals are spatially related.Simulations demonstrate that the QR-based identification algorithms for MIMO channels preserves advantages of fast convergence,low computational costs,and robustness to noise.We also compare the performance of the QR-based method with that of traditional MIMO blind identification algorithms.关键词：QR factorization;MIMO system;blind identification and blind equalization;spatial colored sources2|1176|3更新时间：2025-07-16
- 摘要：We present a model based on utility functions for radio resource allocation (RRA) in multimedia DS-CDMA systems.We proposed two utility-based RRA algorithm,URRA-EF (Utility-based Radio Resource Allocation-Efficiency Focused) and URRA-UF (Utility-based Radio Resource Allocation-User Focused).The goal of URRA-UF is to achieve the resource optimization which maximizes the system overall utilities,while URRA-UF has its advantages on providing fairness to users.To avoid high computational complexity of solving nonlinear optimization problems,we reformulate the utility-based RRA problem as a market model so that the optimal resource allocation can be achieved in a distributed manner.Simulation results show that our algorithm is flexible and efficient for mobile multimedia DS-CDMA systems,and the improvement of performance is significant.关键词：radio resource optimization;DS-CDMA;utility;market;equilibrium2|1437|9更新时间：2025-07-16
- 摘要：Employing smart antennas in the basestation of packet radio network is studied.An adaptive slot allocation multiple access protocol (ASAMA) is proposed.In ASAMA protocol,Time-Division Duplexing is adopted,and pilot signals are transmitted orderly by mobile terminals (MTs) at the beginning of one frame,so the spatial signatures of MTs can be obtained by the smart antennas.Based on the optimal SINR beamforming method,two slot allocation algorithms,which are point-by-point optimizing (PPO) and global optimizing (GO),are presented.On condition that all packets can be received successfully,the basestation dynamically schedules uplink and downlink traffic to achieve that several data packets can be simultaneously transmitted in one traffic slot.Therefore,efficient space-division-multiple-access (SDMA) can be obtained.Approximate analysis of channel utilization is presented.Simulations show that ASAMA protocol effectively supports the application of smart antennas and provides higher channel utilization and lower delay.关键词：packet radio network;smart antennas;multiple access protocols;space division multiple access2|965|0更新时间：2025-07-16
- 摘要：The paper investigates channel estimation of RAKE receiver for DS-CDMA systems.The mathematical model of channel estimation with the assistance of a common pilot channel is established.The relationship between the accuracy of channel estimate and BER performance of RAKE receiver is presented in equation.Furthermore,the MMSE based channel estimation proves optimal in terms of BER performance of RAKE receiver.关键词：the third generation mobile communication;WCDMA;RAKE receiver;channel estimation;pilot2|903|0更新时间：2025-07-16
- 摘要：We present an improved paging algorithm for user in his resident LA in PCS networks:resident cell paging strategy.By analyzing the cell residence times of users,the system first pages user's resident cell and then other cells if the first page fails.Compared with current systems,the method can reduce paging cost greatly and further raise wireless resource usage efficiency.The potential disadvantage of the paper is that the paging delay of the first incoming call to some users in their non-resident cells may be twice the delay in current cellular systems.关键词：paging;delay;cost2|792|0更新时间：2025-07-16
- 摘要：An improved algorithm for classification of MDPSK signals based on cumulants is presented in this paper,which is robust to the error of the carrier synchronization.The new algorithm uses the corresponding relationship between signal difference phase constellation and higher order cumulants.From the relationship a new feature is derived.The feature is invariant with respect to constellation scale,rotation,the shift and the carrier frequency offset between transmitter and receiver.The invariant property of the feature is proved in theory.The simulation results show that the new classification algorithm is high in performance.关键词：cumulants;modulation classification;frequency offset2|981|5更新时间：2025-07-16
- 摘要：This paper develops a blind adaptive interference suppression algorithm for simultaneously suppressing multiple-access interference (MAI) and narrow-band interference (NBI) in direct sequence code division multiple-access (DS-CDMA) systems.This method is based on RLS with a self-tuning regulator for the forgetting factor(SR-RLS).When the system becomes stationary,the forgetting factor approaches to unit for a small steady-state error,while the system is dynamical,then the forgetting factor decreases to make the novel algorithm possess the ability to track dynamical parameters.Compared with other RLS algorithms,it has smaller steady-state error and better ability of tracking dynamical parameters.The convergence of the algorithm is theoretically analyzed.Lastly through simulation the performances of the algorithm under the stationary and dynamical environments are investigated respectively.关键词：blind adaptive multiuser detection;code-division multiple-access(CDMA);multiple-access interference(MAI);narrow-band interference(NBI);self-tuning regulator2|931|3更新时间：2025-07-16
- 摘要：UCL(Uniform Content Locator)build a bridge between writer and reader for better understanding,which is a key technique for data processing such as receiving quickly,information filting,service intelligently and actively in data broadcasting.The methods of UCL-W indexing and multiplexing are put forward for Web service in data broadcasting,and the techniques of multimapping and bistage multiplex are studies in this paper.And then the flow diagram of the data processing,including data gather,UCL indexing,multimapping,multiplexing,data format transform,modulation,are figuir out.The experiment result shows that the creative methods and the new designs are correctly and efficiency based on DVB-C network.关键词：data broadcasting;UCL;information indexing;DVB2|1346|10更新时间：2025-07-16
- 摘要：The performance effects of the digital television terrestrial broadcasting (DTTB)transmission systems caused by the nonlinear distortions and the phase noise are summarized,a uniform model is used to express the complex envelope of orthogonal frequency division multiplexing (OFDM) signal for both the cyclic prefix OFDM(CP-OFDM) and the time domain synchronous OFDM (TDS-OFDM),the fact that cyclic prefix and large amount of training sequences make the CP-OFDM-based DTTB transmission systems have less symbol signal to noise performance than the TDS-OFDM-based DTTB transmission systems is theoretically analyzed,a uniform symbol signal to noise model is thoroughly derived and a performance degradation measure is defined and expressed for both the CP-OFDM system and the TDS-OFDM system in the presence of nonlinear distortions and phase noise,the performance degradations of the CP-OFDM-based and the TDS-OFDM-based DTTB transmission systems in the presence of nonlinear distortions and phase noise are comparatively analyzed both theoretically and by computer simulations.关键词：digital television terrestrial broadcasting (DTTB);TDS-OFDM;CP-OFDM;nonlinear distortions;phase noise2|1052|1更新时间：2025-07-16
- 摘要：The detector using Hopfield network is notable compared with traditional detectors,but it has local optimal behavior.The stochastic Hopfield network is the network,where noise is added to the state variables in order to reach the global optimum and achieve the best detection.The uniform theoretic framework of the detectors based on the stochastic Hopfield network in CDMA communication system is presented.The novel detector guarantees optimal performance by minimizing the corresponding quadratic form.The performance of the novel detector has been tested by extensive simulations in three typical channels,which justifies its superiority compared with other traditional methods.关键词：CDMA;multiuser detector;stochastic hopfield network2|1453|7更新时间：2025-07-16
- 摘要：Security policy of multilevel security DBMS is expressed by many models.One of them is access control model.Mandatory Access Control (MAC) model guarantees that information flow in multilevel databases is inaccordance with security policy.Role-Based Access Control can simplify administration of privileges in multilevel databases.This paper proposes an integrated model of RBAC and MAC.Multilevel role and internal role are defined,and some modified operations in the model are presented.Administration of privileges under MAC policy is done by system automatically.The integrated model can simplify administration of privileges,and is appropriate for multilevel relation database system which has many users or complex security levels.Some implementing mechanisms of the model are provided.关键词：database security;access control;integrated model;RBAC;MAC2|845|6更新时间：2025-07-16
- 摘要：This paper studies the Chaotic phenomena of F-H Communication system with phase-look synthesizer.The influence of the chaos to F-H Communication system is analyzed.By Mel'nikov's method,the system output chaos is proved when the system parameter satisfy certain conditions.The relations between chaos and parameters of the system are obtained when system output chaos.The experimental results and theory analysis correspond excellently with one another.关键词：phase-lock frequency synthesizer;frequency-hopped;chaos2|885|2更新时间：2025-07-16
- 摘要：As different coding structures of MPEG video influence the video reconstruction quality differently,this paper introduces a new scheme to deliver streaming applications over Internet,which is named as Coupon-based TCP Friendly Unequal Protection Scheme (CTFUPS).This new approach provides different level of protection denoted by coupon value to the different structures.The simulation results exemplify that our approach can decrease the frame-loss ratio and improve the video reconstruction quality efficiently.关键词：unequal protection;TCP friend;coupon;MPEG2|731|0更新时间：2025-07-16
- 摘要：The class of PS bent functions is one interesting class of bent functions,they have good algebraic structure and have many applications in cryptography.They are also useful for studying the general structure of bent functions.Unfortunately,the construction of PS bent functions is theoretic,it is still an open problem to characterize the algebraic normal forms of PS bent functions.In this paper we study the properties of such functions,and one method to construct PS bent functions and the corresponding algebraic normal forms are provided.关键词：Bent function;algebraic normal form;Galois field;linearized polynomial2|1050|5更新时间：2025-07-16
- 摘要：Single Gauss Model set based Data Imputation (SGMDI) method is developed to recover Mel-frequency-filter-bank vectors of Chinese speech.Experiments are carried out to study how SGMDI method improves Automatic Speech Recognition (ASR) system's robustness against additive noise.Experimental results show that SGMDI method can improve phoneme correction of all kind of phonemes.Especially for unvoiced phonemes,which are easily distorted by additive noise,phoneme correction will be significantly improved.Thus,ASR system's robustness against additive noise can be greatly improved by SGMDI method.关键词：data imputation;missing data method;ASR2|981|2更新时间：2025-07-16
- 摘要：The topics of fractional (order) derivative and its digital implementations are studied from the view point of signal processing in this paper. A brief survey on fractional differentiation and integration is given, some basic concepts of the fractional calculus and some typical definitions of the fractional derivative are reviewed.Next the digital implementation approaches of fractional differentiators are discussed in detail. Some new problems,which would been encounted in the design of the fractional differentiators,and some new concepts,such as the odd symmetric differentiators and even symmetric differentiators are proposed.Finally,future works are reviewed in the concluding remarks.关键词：fractional calculus;operator;digital filters;return zero problem around zero-frequency;symmetric differentiator;FIR2|1911|32更新时间：2025-07-16
- 摘要：The problem of estimating a density in the presence of noise is considered.Linear wavelet estimators based on Riesz basis are constructed if function belongs to Besov space.Then we use this result,density estimation in the presence of noise by truncated wavelet expansion is studied.The proposed wavelet estimator is an improvement on previous estimators.The density estimation has low computational cost.关键词：wavelets;density estimation;Besov class;Lemarie-Meyer wavelet2|877|0更新时间：2025-07-16
- 摘要：We construct a new method in data fitting fields.Usually,in traditional BP neural network model,data fitting may become trapped at a local minimum.By using the new Double Weights Model,this algorithm can give the Direction Weight,also the Central Weight at the same time.Experimental results show that this algorithm can get more accurate fitting effects and use less generations to calculate,compared with the RBF (Radial Basis Functions) while using the same environment and equal network scale.Data fitting on it should be a new method to modern industry applications in data control and analyses and so on.关键词：neural network;double weights;data fitting2|1018|9更新时间：2025-07-16
- 摘要：The dynamic behavior of discrete Hopfield neural networks with delay is mainly studied by the use of the state transition equation and the energy function,and some results on stability are given.The sufficient conditions for the networks with delay converging towards a limit cycle of length 4,having a stable state,and neither having a stable state nor a limit cycle of length 2 are presented.Also,the obtained results are validated by giving two examples.The obtained results here extend some existing results on stability of discrete Hopfield neural network.关键词：discrete Hopfield neural networks with delay;stability;energy function2|728|1更新时间：2025-07-16
- 摘要：Transcoding technology is a new emerging research topic.It is widely used in the fields of digital video communications and multimedia networks.Transcoding can be defined as the conversion of compressed stream into a desired form meeting the requirements of the transmission and receiving.This paper studied and discussed the classification and research advances of transcoding technology systematically and further pointed out its prospects.关键词：transcoding;bit-rate conversion;resolution conversion;transcoding proxy;error-resilience2|1080|7更新时间：2025-07-16
- 摘要：The improved piecewise linear chaotic mapping is presented to generate the spreading codes for DS-CDMA system in this paper.The spreading properties and the effects of two quantification functions on the spreading properties are analyzed.The simulation results show that the sequences have long period,good balance,δ-like auto-correlation and very small cross-correlation and great linear complexity under the condition of the proper initial values and are suitable to be used as the spreading codes for DS-CDMA.关键词：improved piecewise linear chaotic sequence;spreading code;DS-CDMA;quantification method2|842|4更新时间：2025-07-16
- 摘要：A threshold multiple secret sharing scheme is proposed.Its security is based on the security of RSA signature.i.e.the difficulty of factoring large integers.This scheme has the following characteristics:The shares can be repeatedly used for the reconstruction of multiple secrets.The cheating of dealer and the cheating between participants can be detected.In addition,the interactive protocol is not required while detecting the cheaters.关键词：secret sharing;threshold scheme;multiple secret sharing;RSA signature2|1932|19更新时间：2025-07-16
- 摘要：As a micro mobility approach,Hierarchical Mobile IPv6 (HMIPv6) has been designed to improve the performance of Mobile IPv6 (MIPv6) on the number of management messages and handoff latency.Aiming at decreasing transfer cost and bandwidth consumption when enhancing the mobility management of Internet,the concept of integrated optimization is adopted in this paper.After theoretical computing and comparing the cost of HMIPv6 with MIPv6's,the judgment rules used to determine when HMIPv6 is adopted preferably are obtained,and Adaptive Mobility Management Scheme (AMMS) is proposed,which allows a mobile node residing in a HMIPv6 domain to select a suitable mobility management dynamically from MIPv6 and HMIPv6 according to its working parameters.The results of simulation show the expected performance.关键词：Mobile IPv6;mobility management;hierarchical systems;cost optimization2|904|2更新时间：2025-07-16
- 摘要：Current misuse detection systems are of little use for new attacks and they cannot automatically update their rule databases.SRRW,CHGL and the technology of co-training for independent dual-model greatly improve the apperception ability of CLMDS,and provide a good solution for the limitation of misuse detection systems.Apperception ability is analyzed from static aspect as well as dynamic aspect.Results of the experiments show that with powerful apperception ability CLMDS can not only detect new attacks but also update its own rule base automatically.关键词：IDS;feature selection;machine learning;misuse detection2|1037|1更新时间：2025-07-16
- 摘要：Although distortion caused by the optimal parity assignment (OPA) steganography is very small,it is not secure enough due to the existence of some peculiar colors.No other colors can be modified into these colors in data embedding.This paper proposes a new steganographic scheme that,while keeping the advantage of low distortion of the OPA,avoids the above-mentioned peculiar colors so that steganalysis based on the exploration of these colors is defeated.In addition,existence of stego-information in a palette image may often be revealed through observation of a generated binary image that,due to the randomness of the embedded data,exhibits no correlation with the host image.Making use of the local properties in the host image so that the chaotic degree is reduced,this security flaw in many steganographic techniques using palette images is removed.关键词：information hiding;steganography;palette image;steganalysis2|977|3更新时间：2025-07-16
- 摘要：Multicasting is a communication service that allows a source to efficiently transmit copies of data packet to a set of destination nodes.The run time of multicast routing algorithm is a key problem in real time applications since finding a minimum cost multicast tree is NP-completeness.MPH(Minimum Path Cost Heuristic)algorithm is a famous heuristic solution to multicast routing.In this paper,we show that the O(nm2+e) time complexity of MPH in previous literatures is not correct by theory analysis and extensive simulation,where n is number of network nodes,m is number of destination nodes and e is number of network edges.Furthermore,a precise time bound O(nm2) is proposed.关键词：multicast routing;minimum cost;time complexity2|1053|1更新时间：2025-07-16
- 摘要：In the Maximum Likelihood Linear Regression (MLLR) framework,this paper proposes two fast speaker adaptation approaches,which are called Speaker Adaptation using Triple Diagonal matrices in the log-spectral domain (SATD) and Speaker Adaptation using Shared Block Diagonal matrices (SASBD) in the cepstral domain,respectively.Based on some prior knowledge,the proposed approaches utilize fewer parameters to describe the variation between speakers,and thus fewer adaptation data are needed to give robust estimation.Experimental results in both the whole-word-modeled isolated word recognition system and the isolated word recognition system using triphones as modeling units show that the proposed approaches can provide faster performance than the traditional MLLR approaches.关键词：fast adaptation;transformation matrices;MLLR;triple diagonal matrices;block diagonal matrices2|916|0更新时间：2025-07-16
- 摘要：A new method for camera self-calibration based on the linear iteration is presented in the paper.Without any prior-information about the scene provided,the self-calibration is performed by the linear iteration.The iterative algorithm is executed in two steps:Firstly,assuming the skew s=0 and the principal point lies in the origin,the absolute quadric is acquired in the projective space and then the camera intrinsic matrix is found.Secondly,with the result of the first step,the image coordinates are translated to satisfy the image captured by the camera hypothesized in the first step.These two steps are repeated and the real camera intrinsic matrix is obtained finally.The experiments with both simulate and real data show that the self-calibration method is efficient,robust and have good property of convergence.关键词：self-calibration;linear iteration;absolute quadric2|800|6更新时间：2025-07-16
- 摘要：This paper presents a research on the theoretical issue of optimal set of statistically uncorrelated discriminant vectors.First,the criterion of the generalized optimal set of statistically uncorrelated discriminant vectors is proposed,then a theoretical result on the generalized optimal statistically uncorrelated discriminant vectors is obtained.The research result indicates that the formula of the generalized optimal set of statistically uncorrelated discriminant vectors is the same as that of the conventional optimal set of statistically uncorrelated discriminant vectors,however,which was not realized.The research enriches the theory of feature extraction based on the statistically uncorrelated discriminant analysis.关键词：pattern recognition;feature extraction;discriminant analysis;generalized optimal set of discriminant vectors2|1015|1更新时间：2025-07-16
- 摘要：In this paper we propose a novel multi-objective genetic algorithm based on the Uniform Design Techniques (UDT),which features a fitness function construction approach using the UDT to obtain a set of uniformly scattered search directions toward the Pareto frontier,and a multi-parents crossover operator using the UDT to improve the quality of offspring and decrease the computation cost.It is proved by experimental results that the method proposed is capable of bringing out more uniformly scattered Pareto optimal solutions within a shorter execution time,and that when combined with an efficient representation scheme of circuits based on standard industrial values of components and a genetic parameters adaptation technique which takes into account loci' different effects and tracks the development of evolution and individuals' diversity,it can be expected to realize automated design of analog circuits and to provide a set of effective results via a single execution.关键词：multi-objective optimization;adaptive genetic algorithm;evolutionary circuit design;evolvable hardware;uniform design2|1226|8更新时间：2025-07-16
- 摘要：The paper discusses the circle images-based image conformity with the lens-distortion correction.Due to finding matched points between images taken from the same point,it may avoid the problems of lighting changes and occlusion and aspect changes.It is easier than in the general point-matching problem.The paper has three main contributions:(1)At first we combine the radial distortion correction method with image conformity problem.(2)The paper presents the optimal objection function of projective transformation and lens-distortion parameters and derives the linear formulate of the optimal objection function.(3)The projective transformation and lens-distortion parameters are computed simultaneously with the nonlinear optimal method.关键词：virtual reality;lens-distortion correction;procjective transformation2|2408|1更新时间：2025-07-16
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A Kind of High Speed and High Quality Embedded Zerotree Coding Algorithm for Hardware Implementation
摘要：In this paper,a kind of high speed and high quality embedded zerotree coding algorithm for hardware implementation was presented,significance map structure was simplified,and some redundance structure was reduced.Some useless zerotrees were minished and some isolation zeros not to be kept were cleared up so that efficiency of significance map coding rose.It improved image compression performance,reduced coding and decoding execution time.We designed the biorthogonal 9/7 wavelet basis based on lifting scheme so that it not only raised wavelet transform speed,but also ensured hardware implementation.The simulation experimentation showed that this method improved speed of wavelet transform and shortened time of coding and decoding.It raised image compression rate and improved quality of restructure image.关键词：zerotree;lifting scheme;significance map ceasing sign;variety tree structure2|811|1更新时间：2025-07-16 - 摘要：Enlightened by the defence ability of immune system,a novel immune colon index assignment algorithm (MCIAA) is presented.The new algorithm has a good effort to adjust the dynamic balance between colony's convergence and individual's diversity,and effectively overcomes the problem of local optimal resolution.In this paper,we apply this algorithm to the vector quantization(VQ) index assignment on noisy channel.Simulation result conforms that the algorithm yields a significant reduction in average distortion and converges in less short time compared to other algorithms.关键词：vector quantization;index assignment;noisy channel;immune system;colon2|2|0更新时间：2025-07-16
- 摘要：In this paper,probability weighted average (PWA) algorithm is proposed to reconstruct Mel-frequency filter-bank vectors.The probability-weighted average of K-best reconstructed "missing" components of Mel-frequency filter-bank vectors is taken as the estimation of components masked by additive noise.Experimental results show that PWA algorithm can reduce reconstruction error,increase the continuity between neighbor mel-filterbank vectors and greatly improve automatic speech recognition (ASR) system's robustness against additive noise.2|976|0更新时间：2025-07-16
- 摘要：This paper proposes energy-saving control plan of "intermittent start-stop" operation for oil pump based on light load operation of most oil pumps in oil field.Fuzzy neural network (FNN) prediction method is used as oil-extracting is a complicated process.First,the paper introduces the structure of T-S fuzzy neural network,the structure is simplified and modified combined with the feature of oil-extracting process and requirements for study.Second,the fuzzy neural network is trained by sampling information and expert knowledges.Finally,a practical energy-saving FNN prediction algorithm for oil pump is given.The algorithm is used in controller of intelligent oil pump and energy-saving effects are achieved.关键词：beam-balanced pump;fuzzy neural network;prediction;BP algorithm2|877|2更新时间：2025-07-16
- 摘要：After brief introduction of equipments of SZ stranding machine for optical fibers,this paper designs SZ stranding machine field bus control system based on fuzzy neural network.The system control architecture is divided into three layers,namely,management,control and equipment.The fuzzy neural network is used here to control the reeling system of optical fiber,hence the system can adapt itself more better to the variations in load and external interference,which can gain a satisfied control quality.In the system,WinCC application implements friendly user interface and Matlab application implements fuzzy neural network control algorithm.The system has been running for over one year with good efficency.关键词：field bus;fuzzy neural network;SZ stranding;cabling machine2|937|0更新时间：2025-07-16
- 摘要：The fundamentals of two kernel-based learning algorithms,which are kernel principal component analysis (KPCA) and support vector machines (SVM),are introduced.An estimation formula of upper bound of generalization error is given to estimate the optimal kernel parameters and penalization factor of the SVM.Six-channel EEG data were recorded from four subjects while they performed three different mental tasks.A multivariate autoregressive (MVAR) model is applied to extract the features of EEG.The dimensionality of the feature vectors formed by the coefficients of MVAR models is reduced by KPCA first.Then the feature vectors with lower size are used as inputs of SVM with optimal parameters to train and test classification accuracy for three mental tasks.The classification accuracies indicate that the KPCA technique is a powerful feature selector in high-dimensional feature space,and optimal SVM can get optimal results which are significantly better than that of Radial Basis Function (RBF) network.The average classification accuracy over three mental tasks of four subjects achieves 78.6%.关键词：kernel principal component analysis (KPCA);support vector machines (SVM);mental task;EEG2|1085|6更新时间：2025-07-16
- 摘要：A new approximate model is proposed for the efficient implementation of the electromagnetic scattering and radiation by perfectly electrical conducting (PEC) objects using the method of moments (MOM).In the new model,the PEC object under consideration is divided by two parts,where MOM is performed only on the first part after making a closed-form approximation for the electric current on the second part.Compared with the published hybrid methods,the new model gives better physical explanations.The new model is valid for both two-dimensional and three-dimensional cases.Numerical examples are given for validation of the model.关键词：method of moments;new approximate model;scattering and radiation;hybrid methods;improved PO-MOM2|1001|0更新时间：2025-07-16
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