最新刊期
卷 43 ， 期 6 ， 2015
- 摘要：This paper proposes a subpixel land cover mapping method based on multi-dictionary sparse representation.In this method, some known high spatial resolution land cover maps are used to formulate different dictionaries that represent distribution modes of different land cover classes, the unclassified subpixels are represented by each dictionary, and they are also classified according to the principle of reconstruction-error minimization and spectral distortion constraint.Experimental results both on artificial and real images show that the method deals with the diversity between different distribution modes of different land cover classes effectively, and achieves higher subpixel mapping accuracy and robustness than the other related methods.关键词：subpixel mapping;spectral unmixing;spatial dependence;multi-dictionary learning;sparse representation2|1371|0更新时间：2025-07-16
- 摘要：In addition to the bulk motion induced by constant velocity or uniform acceleration, the target or any structure on it may undergo micro-motion dynamics, such as mechanical rocking, vibrations, or rotations.The traditional range model approximated by second-order polynomials is not suitable for describing the range from a radar to the micro-motion targets.In this paper, combining with Paired Echo Principle and Range-Doppler(R-D) algorithm in synthetic aperture radar(SAR), we derive the vector expression which indicates the multi-channel echo of the ground moving micro-motion target in image domain on the basis of setting up its geometrical model, and analyze the azimuth defocusing in single-channel and the interferometric phase between channels induced by micro Doppler.The normalization of the amplitude of the echo of different ghost points and the correlation coefficient of the spatial steering vectors between each ghost point and clutter are introduced.The result of simulation demonstrates that making use of the ghost points to detect the ground moving target has good improvement factor in strong clutter background.关键词：multi-channel;micro-motion;ghost points;interferometric phase;spatial steeringvector;clutter suppression2|1149|0更新时间：2025-07-16
- 摘要：The side peaks of the ambiguity function of the passive radar will lead to false alarms in detection and the mask of weak targets.We proposed a method to suppress the side peaks of the ambiguity function based on generalized sidelobe canceller(GSC)and derived the closed form expression of the GSC-based filter.Moreover, we analyzed the signal to noise ratio(SNR)loss of the proposed filter as well as the relationship between the heights of the side peaks and the SNR loss.In order to avoid the inversion of high dimensional matrices, we also proposed a fast implementation of the proposed filter design.Both theoretical and numerical results based on real data show that, the proposed method can suppress the side peaks to arbitrary level with minimum SNR loss.关键词：passive radar;ambiguity function;side peaks suppression;generalized sidelobe canceller2|1416|5更新时间：2025-07-16
- 摘要：The redundant participants need to be excluded from the authorized set to achieve a high decryption efficiency in LSSS(Linear Secret-Sharing Schemes) matrix-based attribute-based encryption algorithms.The existing solutions achieve this by searching the minimum participant set in the previously given access policy.Some security threats, however, may be brought in under the previously given policy.And the absence of the access policy disables the existing searching-sound solutions.Thus, an optimizing solution is proposed.Intensive theory analysis and simulation show the proposed solution can get the minimum participant set, which improves the decryption efficiency.关键词：attribute-based encryption;LSSS(Linear Secret-Sharing Schemes) sharing matrix;decryption efficiency2|1625|7更新时间：2025-07-16
- 摘要：In order to improve the separation performance of empirical mode decomposition, an algorithm based on higher order derivative is put forward.First, a necessary condition for separability is studied.It is proved that separability can be improved by even order derivative of the input signal.An algorithm that builds local mean from zero-crossings of the even order derivative is then proposed.Finally, decomposition performance of the proposed method is demonstrated by application to synthetic signals.Numerical experiments show that the proposed method has enhanced separation quality which agrees well with the theoretical analysis.In compared with the empirical mode decomposition, the proposed method exhibits higher accuracy.关键词：empirical mode decomposition;numerical derivative;time sequence analysis2|1319|0更新时间：2025-07-16
- 摘要：A variety researches have been done on gait signal in recent years, which contains abundant information of human physical condition and health status.We measured electrostatic gait signal of 6 young men by a novel electrostatic detector instead of accelerometer.The noise was filtered out using self-correlation algorithm to sink the same phase point in every gait and to obtain accurate gait cycle series.The gait cycle series were decomposed into two component series, magnitude series (absolute value of gait cycle increment) and sign series.The detrended fluctuation analysis algorithm was applied to analyze the original gait cycle series and two component series.It is found that the gait cycle series appears positive long range correlation.For the two component series, the magnitude series show strongly positive long range correlation, while the sign series show obviously long range anti-correlation characteristics for all the tested objects.关键词：human electrostatic;gait cycle;detrended fluctuation analysis;long-range correlation4|1684|2更新时间：2025-07-16
- 摘要：To better simulate the attention selection in human visual system, an improved bionic cognitive neural network for robot is proposed.Firstly, to simulate human visual cortex structure, an improved bionic cognitive neural network is established on the basis of the existing models;it adds top-down visual attention from position motor(Position Motor, PM) to receptive field(Receptive Field, RF), and meanwhile, inferior temporal (Inferior Temporal, IT) no longer receives global visual information and turns to receive local information with bottom-up visual attention, not only reducing the complexity of data processing, but also keeping with human Gestalt psychology.Finally, the model is utilized to realize the robot target recognition and tracking in complex background.Experimental results show that the method can reduce data redundancy and processing time, and also effectively improve the target recognition accuracy in the robot vision system.关键词：attention selection;bionic neural network;robot;vision4|1264|3更新时间：2025-07-16
- 摘要：Information recommendation between groups is one of the most important ways for information sharing and transmitting in social networks.However, it needs exponential time cost to achieve the exact optimal recommendation solution.Hence this paper proposed an efficient algorithm EAOORS (Efficient Algorithm for Obtaining Optimal Recommendation Solution) which equivalently reduced this exponential time cost problem to extended steiner tree problem, and fast achieved the approximate optimal recommendation solution in the polynomial time complexity.The experimental result shows that the EAOORS algorithm is more efficient than the existing ones.关键词：social network;information recommendation;approximation algorithm;performance evaluation2|1471|3更新时间：2025-07-16
- 摘要：Compared with flat regions, image textures have more randomness in structure.As a result, the embedding of secret message in rich textures can obtain better security.Based on the relationship between the least two significant bits of neighboring pixels, we propose a pixel block-based adaptive steganographic algorithm with embedding priority given to image texture regions.In other words, the embedding order is from rich textures to flat regions.Our criterion for texture assessment can adaptively allocate image regions for embedding according to the length of the secret message.To deal with possible irregular embedding blocks, we propose a pixel value modification solution.We have justified this solution mathematically.Experimental results have demonstrated that our algorithm outperforms two established LSB (least significant bit) embedding algorithms and one current edge adaptive steganographic algorithm in terms of embedding efficiency;meanwhile, our algorithm often has stronger resistance to the four representative steganalytic algorithms.关键词：LSB embedding;image texture;adaptive embedding;security;steganalysis2|1695|4更新时间：2025-07-16
- 摘要：We formulate human motion analysis as a high dimensional optimization problem.A generative method is proposed in the framework of evolutionary computation.Firstly, we learn the nonlinear latent space of motion state and use a manifold reconstruction method to establish the inverse mapping.In the search strategy, we apply clonal selection algorithm (CSA) for human pose optimization in the learnt latent space, which proves to be more efficient and accurate.Then, we introduce the temporal information into the traditional CSA and propose a sequential CSA (S-CSA) method for motion tracking.Experimental results show that our method achieves better results than state-of-art methods.关键词：human motion analysis;manifold learning;clonal selection algorithm;pose estimation;motion tracking2|991|0更新时间：2025-07-16
- 摘要：Device-dependency of color introduces such problems as color distortion and error geographic information transmission when electronic maps represent in multiple-medias.Based on the analysis of the characteristics of map gamut, a gamut mapping method based on SOM(Self-Organizing Maps) neural network is proposed.In this method, the weight factor of map color is considered and the neighborhood function, which is anisotropic in map color, is modified.The experiments indicate that our proposed method performs better than the ICC(International Color Consortium) perceptual intent and absolute colorimetric intent on keeping overall color difference.This method can also improve the reproduction accuracy of electronic map colors.关键词：electronic map;color;gamut mapping;neural network2|1193|2更新时间：2025-07-16
- 摘要：Since traditional overlapping community detection methods in complex networks based on label propagation that could not detect overlapping nodes accurately, this paper presented link attribution density and link attribution orientation functions through analyzing the relationship between each link and its neighbor links to assess the attribution community of each link.On this basis, overlapping community detection method based on link label propagation (OLLP) was designed.Firstly, OLLP used the label of every link to the node label which possesses the higher degree when connected by the link, and then updated the label repeatedly through analyzing attribution density and attribution orientation of the link.Finally, identical label links were attributed to the same community.By testing on both synthetic and real-world networks, and comparing with multiple representative algorithms, the experimental results verify the validity and feasibility of OLLP.关键词：complex networks;overlapping community detection;label propagation2|1376|5更新时间：2025-07-16
- 摘要：Current prognostic studies are usually based on historical degradation data, which are collected off line from different devices in a population with the same type.However, such data are not always available in practice.Toward this end, this paper presents a degradation modeling based adaptive remaining useful life prediction method for equipments in service.In the presented method, we use an exponential-like stochastic degradation model to represent the degradation process of equipments.Then, based on the monitored data during the degradation process, Bayesian approach is applied to update the stochastic parameters in the model, so the probability distribution of the predicted remaining useful life is derived as well as its point estimation.Differing from current studies, all unknown non-stochastic parameters in the model are estimated by expectation maximization algorithm, without requiring historical degradation data of multiple devices.Finally, numerical simulations and case study results substantiate the superiority of the presented method in predicting the remaining useful life.关键词：lifetime prognosis;degradation;Bayesian method;expectation maximization2|1597|5更新时间：2025-07-16
- 摘要：The fact that task dependencies may change with case attribute values and the existence of invisible tasks makes it difficult to discover a correct process model from event logs.To address these obstacles, a novel process discovery technique based on case clusters and synchronization cores is presented.The task dependencies among case clusters are first mined, and the sub-process model corresponding to case clusters is obtained by synchronization cores.Then, return cores is proposed to model loop structures and the discovery algorithm of return cores from composite cases is provided.Finally, the synchronization cores and the return cores are integrated, and the integrated synchronization cores are transformed to WF-nets to achieve the business process reconstruction.The proposed technique can solve both the mining problem of invisible tasks and the problem that task dependencies change with attribute values.关键词：process mining;workflow net;case cluster2|1057|1更新时间：2025-07-16
- 摘要：BR0-algebras are important basic algebras, which take MV algebras and R0-algebras as their exceptions, so the study results of BR0-algebras have universal applicability.Firstly, the existence of prime union-ideals is proved through the existence of maximal union-ideals in BR0-algebras;Secondly, having utilized the ideals and methods of dual category and characteristic of MP filter, the concepts of MT ideal, maximal MT ideal, prime MT ideal are introduced to BR0-algebras, and the relationships among them are discussed, and the existence of prime MT ideals is proved by constructing of prime MT ideals through prime union-ideals in BR0-algebras;At last, it is proved that a proper MT ideal can be expended to a maximal prime MT ideal.The work of the paper is a beneficial supplement for the content and methods of studying series BR0-algebras.关键词：logic algebra;BR0-algebras;prime union-ideal;MT ideal;extension;prime MT ideal;existence2|1134|3更新时间：2025-07-16
- 摘要：This paper focused its main research on the antenna port (AP) placement optimization of distributed multiple-input multiple-output (DMIMO) system in a circular cell.For this purpose, a composite channel model integrating with Nakagami-m fading, shadow fading, and path loss was established firstly;next, an approximate closed-form expression of downlink average cell ergodic capacity was deduced under the condition that high signal-to-noise ratio (SNR) was assumed, and multiple antennas were equipped at both the transmitter and receiver sides, which applied selective transmission (ST) and maximum ratio combining (MRC) schemes respectively, and moreover, the distribution of mobile station (MS) in the cell was arbitrary;then, a fast searching method based on particle swarm optimization (PSO) instead of traditional genetic algorithm was proposed to find the optimum positions of APs in the circular cell through dividing the cell into several predefined sections;and finally, the optimum APs' layout was provided according to the overall cell searching results.Computer simulation results show that, the approximate closed-form expression can exactly represent the performance of the DMIMO system, and the finally searched results of optimum AP positions in the cell based on PSO are very close to the theoretical antenna locations.关键词：distributed multiple-input multiple-output;particle swarm optimization;average ergodic capacity;antenna port placement optimization2|1438|2更新时间：2025-07-16
- 摘要：According to the imaging process is easily affected by Poisson noise, the image restoration regularization model that fidelity term is described by Kullback-Leibler Euclidean and the regularization term is established by the square root compound function, with adaptive weight coefficients, is proposed.For the gradient degeneration and the large scale Hessian matrix, it is unable to apply the Newton iterative algorithm to the model.In this paper, constraint set is introduced by the magnitude value of degeneration gradient, the diagonal and easily computed Hessian matrix is established, and the improved Newton iterative projection algorithm is proposed.Simulation results show the proposed can effectively restore image, such as the lower relative error and deviation, the higher peak signal to noise ratio, and better visual effect.关键词：regularization;image restoration;Hessian matrix;active set2|1501|4更新时间：2025-07-16
- 摘要：Query auto-completion of search engines provides good experience for the users.With the user's search intention changing over time, time-sensitive query auto-completion (TSQC) comes to be a research focus.Different from traditional query auto-completion, recommendation list of TSQC is made according to the attaching time features of the query words.First, the definition and classification of TSQC are introduced.Then the key steps of TSQC are presented and analyzed, which include type judgment of time-sensitive query, weight calculation of candidates and recommendation list ranking.Finally, technique evaluation and future development of TSQC are analyzed and summarized.关键词：time-sensitive;query auto-completion;information retrieval;candidates' weights calculation2|2|1更新时间：2025-07-16
- 摘要：In this paper, we present two iterative reliability-based majority-logic decoding algorithms.The proposed algorithm has a lower complexity due to the following two modifications.First, at check nodes, syndrome messages instead of extrinsic messages are calculated and passed back to variable nodes.Second, at the variable nodes, the syndrome messages are directly involved in the voting process.The non-uniform quantization scheme and a new iterative process of reliability-message shifting are also presented in this paper.The received signal achieve a higher quantization resolution near the decision threshold.The shifting direction/step are jointly designed with the quantization parameter and the column weights.Simulation results show that, the presented algorithms can achieve excellent BER performance and fast decoding speed, even with very small quantization levels (3~4 bits resolution).关键词：LDPC code;iterative decoding;majority-logic;non-uniform quantization2|2|3更新时间：2025-07-16
- 摘要：A new numerical method for the study of passive intermodulation is presented against the limitations of time-domain physical optics(TD-PO).The equivalent circuit model of the metal junction that introduced into the full-wave method is established.The passive intermodulation products and the electromagnetic field excited by passive intermodulation products as secondary sources can be analyzed by full-wave method with nonlinear circuit model.Compared with the time-domain physical optics, the proposed method can eliminate the accumulated error from time iteration on objects large in term of wavelength, and can be applied on complicated microwave structures.The numerical results demonstrate the effectiveness of the method in this paper which provides a new method for the analysis of nonlinear problem.关键词：coupled field-circuit;equivalent circuit model;electromagnetic simulation;passive intermodulation2|2|9更新时间：2025-07-16
- 摘要：A finite element model of optical interconnect module was established.The position offset between VCSEL(Vertical Cavity Surface Emitting Laser)and coupling element was obtained after finite elements analysis under thermal cycling load.Different solder shape parameter combinations were designed through orthogonal experimental design and used to establish finite element model.The range analysis was performed based on the alignment offsets of corresponding solder shape parameters.The results show that the maximum alignment offset takes place when the low temperature procedure ends in a thermal cyclic period, the alignment offset in the outer optical channel is greater than that in the middle optical channel;at the confidence of 95%, the height of the VCSEL solder joint has significent effect on the alignment offset, the level of which is sorted descendingly as the height of VCSEL solder joint, the height of ceramic substrate solder joint, the volume of VCSEL solder joint, and the volume of ceramic substrate solder joint, respectively.Single factor analysis results show that the alignment offset increases with the VCSEL solder joint height increasing.关键词：optical interconnection module;alignment offset;couple efficiency;thermal cycling loading;finite element analysis2|1|1更新时间：2025-07-16
- 摘要：To efficiently compute and reduce radar cross section (RCS) of active phased array antenna, and to balance the performance of the radiation and scattering, a novel coupled structural-electromagnetic model of the array RCS factor of active phased array antenna is developed based on the phase errors of the array elements caused by antenna structural distortion and installation.According to the coupled model, the particle swarm optimization method is used to obtain the optimal installation height of all the array elements for the better radiation and scattering performances of active phased array antenna.The simulation results prove that the developed model and the integrated optimization method can effectively reduce the RCS of active phased array antenna with good radiation performances, which demonstrates an important application value in engineering.关键词：active phased array antenna;structural-electromagnetic coupling;radar cross section;radiation performance;element position;phase error3|3|2更新时间：2025-07-16
- 摘要：A method for multi-focus image fusion based on depth information extraction is discussed.Under the optical imaging principle of multi-focus image, the anisotropic thermal diffusion equation is used to estimate the image depth information.Firstly, the optical imaging of two multi-focus images is simulated and the positive thermal diffusion equation is respectively established.After iteration of thermal diffusion equation, the image scene depth information is estimated.Depth information is adaptively divided, and images are divided into three regions:clear region, fuzzy region and intermediate transition region.Finally, the result of the proposed algorithm is achieved as soon as the pixels of clear region are extracted and pixels of transition region are fused.Theoretical analysis and experiment results show that the proposed algorithm is an effective method of image fusion that can overcome the block effect and artifacts in general algorithms.关键词：multi-focus;depth extraction;diffusion;image fusion;layered model2|3|7更新时间：2025-07-16
- 摘要：In order to study the feasibility of ocean surface current measurement using radar scatterometer, the system parameters of the traditional scatterometer were modified, the coherent coefficient model and decorrelation factors were derived, and the phase error model was obtained.Moreover, this paper established an end-to-end model to simulate the ocean surface current measurement.The input wind speeds ranged from 2m/s to 21m/s and the wind direction was parallel to the cross track direction.The results show that the current speed standard deviation in along-track and cross-track direction are smaller than 0.1m/s, when the wind speed is greater than 5m/s.And the swath that can be used for current speed inversion is greater than 40%, when the wind speed is larger than 7m/s.The width of effective swath increases with the increase of the wind speeds.After parameters' optimization, communication error was calculated and the results show that the communication error of the modified scatterometer is better than that of the fan-beam, rotating scatterometer in both the low wind speed and high wind speed conditons.关键词：scatterometer;ocean surface current;coherent coefficient model;phase error model2|2|0更新时间：2025-07-16
- 摘要：The paper proposes a new three-phase four-wire multilevel inverter.Besides the conventional six-switch three-phase full-bridge inverter output, the inverter cascades to a half bridge configuration and has a bootstrap circuit with the load neutral line connecting to the anode of input power.Under the ripple-tracing segmental SPWM(Sinusoidal Pulse Width Modulation), the cascaded half-bridge electricity is obtained when the bootstrap circuit works.The circuit topology structure and its control method reduce the independent direct-current power sources of the multilevel inverter and raise the inverter output voltage.Using the piecewise calculation method, the paper analyzes the ripples and current of the bootstrap capacitor with regular sampling SPWM modulation, and the harmonic waves generated.The analyses and experiments in this paper show that a bootstrap capacitor's capacitance, charging loop resistance, load and modulation degree can affect the capacitor's ripples and current.关键词：three-phase four-wire system;cascaded multilevel inverter;half-bridge;ripple voltage;charge current3|2|0更新时间：2025-07-16
- 摘要：Solid state drives (SSDs)-based RAID-6 calculates parity and writes it to disk array when data is updated, which decreases the performance of disk array and reduces the life time of SSDs.We propose a partial parity-based RAID-6 (PRAID-6), which uses a delayed parity updating scheme to reduce the number of parity updates.Whenever a page is updated, PRAID-6 generates partial parity data of the stripe and stores it on a special non-volatile memory (NVRAM) called parity cache (P-Cache).The new parity is computed by partial parity and old version of parity when garbage collection mechanism is invoked.Then the new parity of the stripe is flushed to SSD.Experimental results show PRAID-6 reduces response time by 30% and 10% compared to RAID-5 and RAID-6, respectively.PRAID-6 reduces garbage collection overhead by 20% and 15% compared to RAID-6 and RAID-5, respectively.关键词：RAID-6;SSD;garbage collection;partial parity;NVRAM2|2|0更新时间：2025-07-16
- 摘要：To detect flip ambiguity in range-based wireless network node localization, some researchers proposed that the flip ambiguity detection is equal to determine whether there is a straight line intersecting with all range error circles of the reference nodes.It is called the existence of intersecting line (EIL) problem.To solve the EIL problem under equal radii, a convex hull algorithm with low computational complexity was proposed.However, for unequal radii, a common tangent algorithm (CTA) has high computational complexity.In order to address the high computational complexity of CTA, we prove that the EIL problem is equal to determine whether there is a straight line, which enables any two circles to have overlapping orthogonal projection onto the line.According to this proof, we propose an orthogonal projection algorithm (OPA) to detect nodes flip ambiguities with unequal radii.The algorithm uses the coordinate transformation to simplify the computation process.The simulation results demonstrate that OPA and CTA have exactly the same detection results, but the computational complexity is greatly reduced.关键词：wireless networks;node localization;flip ambiguity;orthogonal projection2|2|3更新时间：2025-07-16
- 摘要：The detection methods for locating the electromagnetic leakage position on the surface of microwave equipment are researched.According to the different style of the equivalent radiation source, several different detection methods are designed, and the corresponding experimental test plans are also presented.Among them, the synthetic aperture passive radiometer imaging method is suitable for the situation that the equivalent radiation source is incoherent;the digital lens imaging method is suitable for the situation that the equivalent radiation source is coherent;the physical lens imaging method is suitable for all the three situations that the equivalent radiation sources are incoherent, coherent and partial coherent.关键词：electromagnetic leakage;microwave equipment;imaging;synthetic aperture;digital lens;physical lens2|3|1更新时间：2025-07-16
- 摘要：In the two-layer network comprised of macro cells and femtocells, reasonable allocation of resources can effectively control interference and optimize capacity.In this paper, network performance when using different resource allocation schemes are analyzed with the model of downlink interference in two-layernetwork.The optimization algorithm for users is proposed, which can increase system capacity and guarantee users' communication probability.The simulation results show that femtocells' permitted transmit power is improved based on the proposed access mechanism, and system capacity is also optimized.关键词：two-layer network;access mechanism;network performance;communication probability2|2|1更新时间：2025-07-16
- 摘要：In order to enhance the reliability of wireless sensor actuator networks (WSANs), this paper proposes an eigenstructure optimized fault detector for wireless networked control systems.Since the random packet delays caused by the wireless communication networks has adverse impacts on the control systems, the impacts of wireless network-induced delays are modeled as an external disturbance and an eigenstructure optimization method is proposed in the frequency-domain to enhance the fault detector's sensitivity to the fault and improve its robustness against the network delays.The main advantage is that the assumption of a known transition matrix of Markov jumping system is avoided.The performance of the proposed fault detector is demonstrated by the results of hybrid MATLAB/NS2 simulations.关键词：wireless sensor actuator networks;networked control systems;network transmission delay;fault detection2|2|2更新时间：2025-07-16
- 摘要：A MIMO-aware threaded topology transparent multiple access(MIMO-T-TTMA) protocol is proposed for MIMO link ad hoc networks.MIMO-T-TTMA utilizes the protocol threading technique and combines a time spread multiple access(TSMA) protocol and a time division multiple access(TDMA) protocol in time-sharing mode.In MIMO-T-TTMA, each node in the networks is assigned a few slots.In each of its assigned slot, node determines the number of data streams to be transmitted by exchanging request to send/clear to send(RTS/CTS) packets.While the exchange of RTS/CTS fails or the slot is a non-assigned slot, the node also transmits one stream according to some probability in order to improve the throughput.To evaluate the performance, the throughput of MIMO-T-TTMA is deduced by theoretical analysis.Numerical results show that, compared with existing protocols, MIMO-T-TTMA has higher throughput when node degree is relatively large, moreover, the throughput is more stable with the changes of node degree, therefore, MIMO-T-TTMA applies to the ad hoc networks whose topologies vary significantly.关键词：ad hoc networks;media access control;protocol-threading;time spread multiple access;multiple input multiple output(MIMO)3|2|1更新时间：2025-07-16
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