最新刊期
卷 34 ， 期 7 ， 2006
- 摘要：The encoding problem is a most fundamental issue in DNAbased computing,and lots of experiments have shown that the reliability of this new paradigm can be improved significantly through appropriate encoding strategy.This paper introduces various constraints and the relation between them and the number of words might attained over three-letter alphabet {A,T,C}.Then we present a construction algorithm based on linear codes.Finally,we point out some problems and directions needed further studying.关键词：DNA computation;words;linear codes;algorithm0|2|5更新时间：2025-07-02
- 摘要：A real-time image tracking algorithm is proposed in this paper.This algorithm gives small weights to pixels farther from the object center and uses the quantized image gray scales as a template.It gets the target's location by mean-shift method and gets the target's scale using image feature recognition.It improves the kernel-based algorithm in tracking scale-changing targets.A decimation method is proposed to track large size targets.Real-time experimental results verify the effectiveness of the proposed algorithm.关键词：object tracking;video processing;mean-shift algorithm;feature recognition0|2|6更新时间：2025-07-02
- 摘要：Fair access of the shared wireless medium among different flows is an important issue in 802.11 based wireless ad hoc networks.However,due to unfairness caused by 802.11 DCF,802.11 based ad hoc networks face a severe "fairness problem".In some cases,some stations or flows may capture the whole channel while other stations or flows suffer from starvation.A novel fair medium access mechanism FFMA (Flow rate-based Fair Medium Access) is proposed in this paper.FFMA can provide a per-flow fair channel allocation by fair scheduling and fair contention.The simulation results prove that FFMA can achieve much better fairness than 802.11 DCF and guarantee a reasonable throughput performance in wireless ad hoc networks.关键词：wireless ad hoc networks;fairness;MAC;fair scheduling;fair contention0|2|1更新时间：2025-07-02
- 摘要：Multi-subsystems coexist in 3G core network and same functions are provided redundantly.This paper proposes an enhanced core network architecture by introducing two separate servers called MMS (Mobility Management Server) and ACS (Access Control Server) which are used to provide mobility and security services respectively.The enhanced core network enlarges the system capacity,enhances the system's capability on supporting mobility and security services,degrades the entity's complexity and facilitates the independent advancement of those control logics.Both core networks are analyzed with M/D/n infinite buffer queuing system based on the assumption that state transitions occur at departure points.The departure point queue length distribution,average queuing delays and average call processing delays are obtained and compared.The results validate that the enhanced core network architecture is efficient and practicable.关键词：IP multimedia subsystem (IMS);core network;mobile management;location service;access control0|2|0更新时间：2025-07-02
- 摘要：This paper addresses a traffic engineer implementing mechanism.By the resource analysis algorithm,an optimal route is selected for a PHB,by QoS analysis algorithm,a optimal PHB is selected for a user service.Not only can it make network provide well performance with less cost,but also implement a better burden equilibrium and better resource distribution equilibrium in three dimensions.Experimental results verify its merits.关键词：traffic engineer;service level agreement;IP qualify of service;IP-DiffServ0|2|4更新时间：2025-07-02
- 摘要：In order to reduce the flooding overhead of alternate path construction,most existed alternate path routing protocols build their alternate path routes (APR) during route discover period,which leads to two limitations.As the topology of the ad hoc network evolves,links will be created and destroyed,resulting in route reduction or route failure.Additionally,changes in network traffic (including the traffic introduced by the source itself) will have a significant effect on traffic-dependent route metrics.This motivates the need for a route-probing mechanism that could periodically re-assess the status of the APR route set.The results of those route probes could then be used to both construct a new APR route set and also adjust the route alternation policies.The alternate path route set is unidirectionally constructed from the source to the destination by flooding,which is inefficiency for bi-directional communication.In this paper,we present a cross-layer design and ant-colony optimization based load-balancing routing protocol for ad hoc networks (CALRA).In CALRA,ants deposit simulated pheromones as a function of multiple parameters corresponding to the information collected by each layer of each node visited,such as the distance from their source nodes,the congestion degree of the visited nodes,the current pheromones the nodes possess,the velocity the nodes move and so on,and provide the information to the visiting nodes to update their pheromone tables by endowing the above different parameters corresponding to different information with different weight values,which provides a new method to improve the congestion problem,the shortcut problem,the convergence rate and the heavy overheads commonly existed in existing ant-based routing protocols for ad hoc networks.With the pheromones evaporation mechanism,CALRA can age and re-assess the APR set.The performance of the algorithm is measured by the packet delivery rate,the good-put ratio (routing overhead),and the end-to-end delay.Simulation results show that CALRA performs well in decreasing the route overhead and balancing traffic load,as well as increasing the packet delivery rate,etc.关键词：cross-layer design;ant-colony optimization;load-balancing routing protocol;alternate path route0|2|7更新时间：2025-07-02
- 摘要：Supporting multi-traffics is the direction in the future wireless communication networks.According to the 3GPP UMTS standard,there are four traffic classes distinguished by their different QoS demand,including conversational class,streaming class,interactive class,and background class,while three of them are variable bit rate (VBR) traffic except conversational class.It will fall into a dilemma if conventional resource allocation methods are applied (especially for the bandwidth allocation).In this paper,a dynamic bandwidth allocation scheme is proposed for broadband CDMA networks.The scheme could meet the user's QoS guarantee,while the utility of resource could be improved.Simulation results demonstrate that the proposed scheme can greatly improve the system performance and resource utility compared with the conventional schemes.关键词：wireless communication networks;radio resource management;QoS;optimization0|2|2更新时间：2025-07-02
- 摘要：A new postfix signal,called "PP" (Pilot Postfix),for Orthogonal Frequency Division Multiplexing (OFDM) system is proposed.PP is formed by linear processing to pilots in OFDM symbol,and can be combined with those pilots in OFDM symbol at receiver.Channel estimation and demodulation algorithm are proposed for PP-OFDM also.Theoretical analysis shows that PP can improve channel estimation performance compared with cyclic prefix/zeros postfix (CP/ZP).Simulation shows that PP-OFDM has lower Bit Error Rate than CP/ZP-OFDM because of better channel estimation performance,when CP/ZP/PP-OFDM have their own optimal pilot power allocation respectively.The optimal power allocation of PP-OFDM can be found by two-dimension searching,while there is only one-dimension needed to optimize for CP/ZP-OFDM.关键词：orthogonal frequency division multiplexing (OFDM);channel estimation;pilot power allocation0|2|1更新时间：2025-07-02
- 摘要：The shortest path algorithm of directed networks plays an important role in transportation and communication systems.In the classical models,the weight of each arc is given beforehand,but it may be varying in the practical problems,for instance the run time would increase in the traffic jam.It is high cost to run the Dijkstra algorithm each time when changes of the weights occur frequently in a large scale network.In order to improve the efficiency of the shortest path computation in the varying-weight networks,we make use of the information of the network before the weights altered.The concept of the stability of shortest paths is presented,and a new stable brand-based algorithm is proposed.Experimental simulation shows that the new algorithm improves the efficiency of the varying-weight optimal path computation significantly.关键词：network optimization;shortest path;varying weight;algorithm;stability0|2|5更新时间：2025-07-02
- 摘要：An inverse iterative subspace method for SIMO blind identification is proposed based on the cross relations over the time dispersive channel.A first order perturbation analysis is conducted on the proposed estimator.In order to intensify the stability of the proposed estimator,an iterative inverse CR matrix is also presented by using the perturbation theory and Taylor's expansion up to the first order.Theoretical analysis and experimental results demonstrate that the proposed estimator has a better performance over the existing blindly adaptive algorithms,the method of iterative inverse CR matrix is not only simple but also valid,and there exits a high consistency between the perturbation analysis and the experimental results.关键词：channel estimation;subspace iteration;single-input multiple-output systems;cross relations;perturbation analysis0|2|2更新时间：2025-07-02
- 摘要：In 1993,Matsui put forward that linear cryptanalysis is one of the most important security indeies for designing block ciphers.So it is necessary to estimate the resisting linear cryptanalysis ability of block ciphers.M.Kanda discussed the linear deviation of traditional Feistel ciphers in 1999.Nyberg and Zhang Lu-wen investigated the linear deviation of a kind of special unbalanced Feistel networks.In this paper,we investigated and analyzed the linear deviation of a kind of m-group unbalanced Feistel networks.The mathematical relation between linear deviations of unbalanced Feistel networks and round function F is given.The upperbounds of linear deviation is discussed.Two properties about the average for the square of linear deviation is also proved.Our researches extend the results of K.Nyberg and Zhang Lu-wen.关键词：linear cryptanalysis;unbalanced Feistel networks;linear deviation;the average for the square0|2|4更新时间：2025-07-02
- 摘要：Mobile color message is popular used in rapidly development of mobile communication.For digital right management(DRM) of color message,the image watermarking algorithm is proposed that can been blind extracted with high capacity and strong robustness in FFT domain.It modulate the watermark information in the magnitude relationship of spectrum amplitude sampling points with resistance to random scale,basic rotation,transform of format and general image processing,etc.The algorithm use FFT based apperception model and adaptive informed coding and imbedding technique to improve the fidelity and robustness while the overflow has been controlled.The results prove its effective and can calculate in real time.关键词：image watermark;geometry transform;blind extraction;informed code;informed embed0|2|1更新时间：2025-07-02
- 摘要：To restrain the video transmission error propagation over error prone environment,a new non-feedback reference picture selection algorithm based on key frame was proposed.By using a general end-to-end distortion model that is suitable for various concealment methods,the distortion expectation of decoder is estimated approximately for different reference pictures selection at encoder.Based on rate-distortion optimization rule,the best suitable reference picture is chosen to minimize the decoder distortion.Simulation results in H.263+ test model TMN8 and over IP lost environment show that the proposed algorithm can increase about 1~3 dB performance gains comparing with traditional prediction algorithm for different QCIF video sequences.关键词：video coding;error resilience;reference picture selection;rate-distortion optimization;key frame0|2|4更新时间：2025-07-02
- 摘要：A new blind source separation algorithm for convolved mixtures of speech singals is developed with consideration of different delayed multi-path reflections.Based on the sparseness property of speech signals,the proposed algorithm extracted time-delay and amplitude coefficient candidates through the contrast analysis of two speech spectrograms.Motivated by maximum likelihood estimation,we defined a reliablility function constructed from the parameter candidates.The reliability analysis histogram was shown to have one peak for each pair of parameters with peak location corresponding to the real time-delay and amplitude coefficient.Instead of using the independent assumption,the proposed algorithm made use of speech spectral sparseness to perform separation and proved to be applicable in most occasions.Since it involves no iterations and does not have the convergence problem,the proposed algorithm is fast and stable.Simulations and real-world experiments demonstrate the proposed method can accurately estimate time-delays and amplitude coefficients in various SNR conditions.Successful recovery of source signals using estimated parameters proves algorithm feasible and can be applied to real-world speech separation applications.关键词：blind source separation;convolutive signals;time-frequency analysis;reliability function;statistical analysis;real-world signals0|2|6更新时间：2025-07-02
- 摘要：Pulse Coupled Neural Network (PCNN) has gained widely application in image processing,pattern recognition,artificial intelligence etc,since it was proposed.PCNN can perform perfect image segmentation due to its biological background.PCNN has the property of local interconnection and changing threshold through which those adjacent pixels that have approximate gray values can be pulsed simultaneously.So PCNN has the foundation of realizing the regional segmentation.And segmented images that contain the details of origin can be achieved and at the same time the trivial segmented regions may be avoided.For the better approximation of irregular segmented regions,the Gram-Schmidt method,by which a group of orthogonal base functions is constructed from a group of linear independent initial functions,is adopted.It was found that much less computer memory was needed to store the coefficients than the original image,resulting in data compression.Because of the orthogonal reconstructing method,the quality of reconstructed image can be greatly improved and the progressive image transmission also becomes possible compared to JPEG algorithm.关键词：pulse-coupled neural neworks;the orthonormal basis;irregular segmented region;Gram-Schmidt orthonormalization0|2|7更新时间：2025-07-02
- 摘要：Where should watermarks be embedded in DCT domain in order for the audio watermark to be in inaudible and robust? Though many works in the literature agree that watermark should be embedded in the middle-frequency coefficients or perceptually significant components,how to determine the position embedded has no universal definition.A new embedding strategy and an algorithm applying the strategy are proposed for audio watermarking in DCT domain based on research of DCT noise modal.By defining a noise sensitivity vector,a math relationship between the watermark embeddable position and the audible quality of the audio file with watermark is set up.First the optimal position to be embedded based on the inaudible requirement is selected.Second the power coefficient of watermark is adjusted to satisfy the requirement of robustness.So the utmost need of inaudible and robust of audio watermarking scheme was filled.It is a good approach to settle the trade-off between the two requirements of audio watermarking:inaudible and robustness.Experimental results demonstrate that the embedding strategy is effective and the watermarks thus generated are very robust.关键词：digital audio watermarking;DCT (Discrete Cosine Transform);embedding strategy;noise sensitivity0|2|14更新时间：2025-07-02
- 摘要：The paper proposes an unsupervised semantic categorization algorithm for annotated images.In order to establish image categories automatically by unsupervised learning,the algorithm first scores the annotation words for each image by using their relevance to visual features.The scores of annotation words indicate to what extent these words have visual characteristics.The words with a good visually discriminative power can be chosen as image categories.Then a recursive clustering algorithm is presented to group images into the extracted semantic categories according to their annotation.Experiments using a 4500-image Corel database show the efficacy of the proposed algorithm.The results can be exploited for better image browsing and image retrieval.关键词：image clustering;image retrieval;image annotation;image categorization;image browsing0|2|4更新时间：2025-07-02
- 摘要：Using the tracking-based methods segmenting the coronary artery tree in X-Ray Angiogram (XRA),the traditional methods were subject to the blood vessel's node and the local high curvature.To overcome the disadvantages,we presented a Multi-Features Measure (MFM) based Probability Tracking Model (PTM) to extract the blood vessel tree,and used a centerline operator to optimize the vessel skeleton-line.In the experiments,the proposed method on one hand avoids the problems of the traditional one;on the other hand the low time-consuming,the high robustness and the full automation are attained.Given an initial point in the interest vessel object,over 80% of the visible vessel branches in XRA image can be automatically delineated.关键词：blood vessel segmentation;blood vessel tracking;multi-features measure;probability tracking model;coronary artery X-ray angiogram0|2|4更新时间：2025-07-02
- 摘要：A novel edge detection algorithm based on the combination results of gradient and zero crossings is presented which the image intensity of neighborhood region of pixel is well estimated by Least Squares Support Vector Machines (LS-SVM) and the gradient operator and zero crossings operator are obtained by LS-SVM based on polynomial and Gaussian kernel function.Optimal convolution kernels size is obtained by experiments when different kernel functions are applied and free parameters of kernel functions are also be optimized by genetic algorithm in order to achieve best edge detection performance.Compared with Canny method,it is shown that the proposed method based on LS-SVM is effective and fast.0|2|11更新时间：2025-07-02
- 摘要：Predicated execution promises to reduce control flow overhead and to enhance optimization,provided that instruction scheduling and register allocation can utilize it efficiently.Based on binary decision diagram (BDD) predicate analysis system,this paper proposes the method to optimize control structures in programs utilizing complementary predicate.And based on traditional graph coloring register allocation,a new algorithm to construct unified and simplified interference graph utilizing complementary predicate is presented,which can reduce spill code.Moreover,complementary predicate-aware scheduling is proposed to reduce the superfluous commitment of resources to operations whose predicates evaluate to false at run-time,and the architecture is modified to support scheduling.Experiment results in YHFT-DSP/700 compiler show the effectiveness of proposal method.关键词：compiler;complementary predicate;predicate analysis;instruction scheduling;register allocation0|2|2更新时间：2025-07-02
- 摘要：To control the eddy current losses so as to enhance efficiency,a simple and effective method to caculate the number of slots needed to meet the demands at the working frequency limit is put forward in this paper,instead of by using commercial FE package(i.e.,Maxwell).While completing the magnetic return path with a external material,the equivalent electrical circuit of Terfenol-D bar was derived.An illustrating example results consistent with the offered calculation method in this paper.关键词：Terfenol-D rod;working frequency limit;eddy current losses;equivalent electrical circuit0|2|2更新时间：2025-07-02
- 摘要：Ultrahigh-density hard disk drive is needed with the development of Internet,but thermal decay is becoming more and more significant with the increasing of recording density.In this paper,thermal relaxation in media was examined by simulation and experiments.Bit density dependence of thermal relaxation of recorded signal was mainly discussed and the influence of media parameters was also considered.We pointed out that perpendicular magnetic recording is one of the most appropriate method at ultrahigh recording density.关键词：thermal relaxation;ultrahigh recording density;perpendicular magnetic recording0|2|0更新时间：2025-07-02
- 摘要：This paper proposes a Bee Evolutionary Genetic Algorithm (BEGA).In BEGA,optimum individual being a queen-bee in population crossover with each selected individual (drone).As a result,it reinforces the exploitation of genetic algorithm.In order to avoid premature convergence,BEGA introduces a random population that extends search area.Consequentially it enhances the exploration of genetic algorithm.By treating the collection of individuals in each generation as a state and modeling the algorithm as a homogeneous finite Markov chain,it is proven that BEGA can guarantee the convergence towards the global optimum of the problem.Experiments results show BEGA is an efficient and effective improved genetic algorithm.关键词：genetic algorithm;elitist preserved;global convergence;Markov chain0|2|37更新时间：2025-07-02
- 摘要：Bandwidth is the metric used to describe the network information transfer capacity.It is an important measure to evaluate the quality of services in a network.This paper emphasizes the importance and classifies the techniques of bandwidth measurement for IP networks.It gives the definitions of measures,such as link / path bandwidth,available bandwidth and bulk data transfer capacity,and analyzes the principles and merits of typical bandwidth measurement techniques.It also introduces several corresponding open source tools for these measurements.and discusses the main factors which impact the measuring constringency speed and accuracy.It finally gives a view of further research and application trends in this area.关键词：bandwidth measurement;link capacity;path capacity;available bandwidth;bulk transfer capacity0|2|6更新时间：2025-07-02
- 摘要：Current IMS (IP multimedia subsystem) fault-tolerant systems only implemented state-sharing mechanism of SIP call stateful proxy.We proposed and implemented a UDP-based state-sharing mechanism of SIP transaction stateful proxy.Based on heavy stress testing,experimental reliability figure is shown.By mathematical analysis and derivation,we proved the proposed relationship equation of Tout and reliability R.Experiments showed that the results of the theoretical analysis can reflect the real performance of the system,and the theoretical and practical Tout breakpoint value is consistent.关键词：IP multimedia subsystem;next generation network;state-sharing;fault-tolerance;session initiation protocol;reliability0|2|0更新时间：2025-07-02
- 摘要：This paper focuses on the quantitative analysis issue to the routing metrics tradeoff problem,and presents a quantified cost-balanced overlay multicast routing scheme (QCost-Balanced) to the metric tradeoff problem between overlay path delay and access bandwidth at Multicast Server Nodes (MSN) for real-time applications over Internet.Simulation experiments demonstrate the scheme achieves a better gain in both MSN access bandwidth and overlay path delay,and better performance in terms of metrics tradeoff and routing adaptation.关键词：overlay multicast;cost-balanced routing;quantitative analysis0|2|0更新时间：2025-07-02
- 摘要：A new mixed analog-digital PN code acquisition method based on the second-order sampling technology and analog matched filters is presented for DS/CDMA systems.The statistical characteristics of acquisition-decision variable are analyzed in detail.And on the basis of the analysis,the detection probability and false alarm probability of PN code acquisition are derived in presence of Multiple Access Interference (MAI).This method directly makes quadrature demodulation of the IF signal by utilizing the second-order sampling and sign-alternating,and then calculates the correlation value between the receiver signal and the local spreading code in analog domain.Compared with the all digital method based on digital matched filter,this method can excuse the quadrature-demodulator and ADC and it has the advantages of low power dissipation and high speed.关键词：second-order sampling;analog matched filter;DS/CDMA systems;MAI;acquisition performance0|2|0更新时间：2025-07-02
- 摘要：An adaptive algorithm based on FFT for PN code phase measuring of DS/SS signals was proposed.The algorithm firstly determines the mensurability of the signals and the lowest sampling rate for correctly detecting the signals,and calculates the PN code phase at this sampling rate,then gradually increases the sampling rate and calculates the PN code phases at those sampling rates using circular convolution,until the expectant precision is acquired.Comparing with the other FFT-based methods,the proposed algorithm can effectively decrease the computation for given precision,or increase the precision with a similar computation.The algorithm is applicable to precise measuring of the PN code phase of satellite positioning signals and spread-spectrum ranging signals.关键词：DS/SS;FFT;circular convolution;spread-spectrum ranging;fast acquisition of PN code0|2|2更新时间：2025-07-02
- 摘要：This paper presents a novel model of intrusion detection based on fuzzy cluster and immune principle,the original RPCL algorithm is modified in order to address the problem of different variability of variables and correlation between variables,the sensitivity to initial number of clusters is also solved in this paper.Especially,this paper uses the extended RPCL algorithm to determine the initial number of clusters in the fuzzy cluster algorithm.The genetic algorithm is used to optimize the radius deviation for the determination of characteristic function of abnormal subspace.Some results are finally reported with some concluding remarks.关键词：intrusion detection;fuzzy cluster;immune principle;genetic algorithm;RPCL algorithm;correlation0|2|3更新时间：2025-07-02
- 摘要：A fully automatic method for enhancement and segmentation of three-dimensional cerebral vessels in low contrast MRA is presented.We obtain the 3D dyadic B-spline wavelets by extending the corresponding 1D wavelet.A 3D steerable filter is then developed based on 3D dyadic B-spline wavelets,it can be adapted to an arbitrary direction.The oriented energy of filter response is introduced for detecting orientation strength of vessels in that direction.The points with maximum of local oriented energy across multiple scales are detected and then cerebral vessel tree can be extracted by simple thresholding.This method was tested on real MRA data and promising results have been obtained.It could be suitable for other types of curvilinear structures such as cardiovascular vessels,bronchial tree.关键词：3D steerable filter;3D dyadic wavelet transform(DWT);cubic B-spline;oriented energy;vascular vessel detection0|2|1更新时间：2025-07-02
- 摘要：In this paper the authors analysis the law of information leak of self-synchronous chaotic ciphers,hereby present a divide-and-conquer attack to self-synchronous chaotic ciphers,which is the first attack of this kind in this area.Because the output signals at each clock can be used in the attack,the ability of self-synchronous chaotic ciphers to resist the divide-and-conquer attack is weaker than that of synchronous chaotic ciphers.As an example,we realized the divide-and-conquer attacks to the self-synchronous chaotic cipher proposed by Hong Zhou etc.with 64 bits key and the self-synchronous chaotic map being the 65 iterations of a chaotic map.It took about 25 hours and 22 minutes to recover the key at a success rate 0.86 on a Pentium 4/2.5GHz personal computer with 10000 known plaintext.关键词：chaotic cipher;self-synchronous chaotic cipher;divide-and-conquer attack;known plaintexts attack0|2|9更新时间：2025-07-02
- 摘要：Camera motion classification is an important issue in content-based video analysis.In this paper,a robust and hierarchical camera motion classification approach based on statistical learning is proposed.As Support Vector Machines (SVM) has a very good learning capacity with limited sample set without incorporating problem domain knowledge,in the first step,SVM is employed to classify camera motion operations into two classes:translation and non-translation operations.Then,rotation and zoom operations are distinguished using motion vectors' location and direction.The direction of translation operation is also identified.In the pre-processing step,cinematic rule is utilized to filter atypical noise and foreground motion noise.关键词：camera motion;classification;SVM;video0|2|1更新时间：2025-07-02
- 摘要：This paper presents a method of image protection using self-embedding.The image is divided into 8×8 block ,compressed codes of each block and authentication information of the block offset are embedded into the block offset.When data is embedded,only no more than half of the data on the least significant bits need to be modified,and relatively the influence to the original image is on the small side.Changes to the image can be detected,located and corrected with this method.关键词：self-embedding;tamper locating;image recovery;fragile watermark0|2|9更新时间：2025-07-02
- 摘要：A novel method for the design of a bilinear time frequency distribution (TFD) for multiple linear frequency modulated (LFM) signals is proposed.Its kernel is constructed based on the product ambiguity function (PAF),which efficiently suppresses the cross terms and noise in the ambiguity domain.Two algorithms for the kernel function design are developed to determine the angles and distances of the radically distributed contents of the auto terms in the ambiguity domain.Simulation results validate the methods and show high resolution and efficient suppression of noise and cross-terms in the time frequency plain.关键词：time-frequency distribution;LFM signal;product ambiguity function0|2|2更新时间：2025-07-02
- 摘要：Reinforcement learning(RL) problems with uncertainty and hidden state present significant obstacles to prevailing RL methods.In this paper,a novel approximate algorithm,called Memetic algorithm based Q-Learning (MA-Q-Learning),is proposed as a means to solve the POMDP problems which has such uncertainty problems.The policies are evolved using memetic algorithms,whereas the improved Q-learning obtains predictive rewards to indicate fitness of the evolved policies.In order to solve the hidden state problem,historical information is incorporated with the current belief state to aid in finding the optimal policy.Finally,the search efficiency is improved by a hybrid search method,in which an adjustment factor is used to help keep the diversity of population and guide the crossover based on the combination of multiple kinds of crossover and mutation.The experiments conducted on benchmark datasets show that the proposed methodology is superior to other state-of-the-art POMDP approximate methods.关键词：POMDP;Q-learning;memetic algorithm;belief state;hidden state0|2|8更新时间：2025-07-02
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