最新刊期
卷 43 ， 期 10 ， 2015
- 摘要：As an important technology to optimize the allocation of resources and load balancing, multipath routing has advantage of reliability in routing, QoS routing, transmission efficiency and other aspects than single path.The current Internet architecture and mechanisms have a low resource utilization, poor network security, poor scalability, and high-energy consumption, which is not conducive to the advancement of multipath.Meanwhile, the disadvantage of the current multipath techniques was the path selection and calculation.Multipath algorithm only chose the path considering the network performance and parameters limitedly, which may choose the congestion path.In this paper, we proposed a multi-parameter multipath routing protocol of smart and cooperative networks, and analyzed the flow distribution by the graph theory.We distributed the flow by the path weight, and the weight was determined by CPU utilization, RTT and bandwidth.We developed and experimented the algorithm on the Mini-Net, and the simulations revealed that the algorithm could achieve wisdom together the multipath data transmission function of the network, and ensure transmission performance of the chosen flow distribution.In addition, it was easy to implement, effective to save the network resources and optimized the network configuration, improved the efficiency of network transmission.关键词：smart and cooperation network;multipath;multi-parameter;routing protocol;traffic assignment2|2|2更新时间：2025-07-16
- 摘要：In the presence of sensor position and velocity errors, this paper considers the problem of simultaneously locating multiple disjoint sources and refining erroneous of sensor positions and velocities using time differences of arrival (TDOA) and frequency differences of arrival (FDOA).The previous work by Sun and Ho to solve this problem provided an efficient estimator for multiple disjoint sources, but it cannot provide optimum accuracy for the sensor positions and sensor velocities.In many practical applications, it's necessary and helpful to refine sensor locations and velocities while localizing multiple sources.The proposed method improves the previous method so that both the source and the sensor position and velocity estimates can achieve the Cramér-Rao lower bound (CRLB) accuracy very well over small noise region.The theoretical derivation is corroborated by simulations.关键词：time differences of arrival (TDOAs);frequency differences of arrival (FDOAs);multiple sources;passive localization;sensor position and velocity errors6|2|6更新时间：2025-07-16
- 摘要：Precise integration method combined with the spectral element is used to simulate and analyze the stop-band characteristic of anisotropic dielectric layer photonic band-gap (PBG) structures in waveguide.From the variational principle based on single variable corresponding to the vector wave equation, 2-D spectral elements are employed to discretize the cross section of the layered structure, which contains anisotropic dielectric.Introducing the dual-variables, the variational principle is cast into the Hamiltonian system, and then the high precision integration method is utilized to perform the stiff matrices.Compared with conventional finite element method and semianalytical finite element method, numerical results demonstrate that the semianalytical spectral element method is more accurate and efficient for anisotropic PBG structures analysis, and it can achieve spectral accuracy with the increase of interpolation degrees of basis functions.关键词：anisotropic;photonic band-gap (PBG);spectral element method;precise integration method2|2|1更新时间：2025-07-16
- 摘要：With the development of Big Data technology GPU cluster as a high efficiency parallel system applies into the Large-scale data computing field.Energy is a significant computation resource.So power consumption optimization control and capping in real-time becomes a challenge issue.The Model Prediction Control strategy is introduced and a Multi-Input Multi-Output controller is built by using a closed loop feedback principle from the whole cluster perspective.Power consumption status is changed by scaling frequency and adjusting active stream multi-processors.Then the feedback and the periodic optimization mechanisms can predict the control behaviors in the future control cycles.This achieves the goal that reduces redundancy energy.The results demonstrate that the proposed model has more accuracy and comsumes less energy than the others.And it has better control stability.So it has better adaptability and obvious advantage in the Large-scale data real-time computing.关键词：power consumption control;graphic processing unit (GPU) clusters;power capping;model prediction control2|2|2更新时间：2025-07-16
- 摘要：In order to improve the capacity of the cognitive small cell network (CSCN), this paper analyzed the dynamic allocation of the spectrum, small cell base stations (SBS) and transmission power in the uplink based on the game theory.The traditional allocation scheme only considered the optimal allocation among independent frequency bands in heterogeneous networks, without taking into account the mutually overlapped frequency bands and the joint resource allocation in the uplink.For this reason, the joint optimal allocation etiquette is proposed.The interference temperature constraints, the new interference operator and the memory factor were introduced in the new uplink water-filling algorithm.Based on the characteristic of dynamic selection and the interference avoidance rule of interference temperature.Simulation results show that our algorithm can effectively improve the throughput and robustness of the CSCN.关键词：cognitive small cell networks (CSCN);game theory;spectrum allocation;power allocation;NASH equilibrium2|2|4更新时间：2025-07-16
- 摘要：In order to explore cross-media color reproduction performance on background parameters of CIECAM02, visual color matching experiments based on simultaneous-binocular viewing method are implemented to obtain a set of corresponding color data between monitor and printer.The data was used to analyze background influences on color appearance and test performance of CIECAM02.Results show that background lightness is mainly effective in lightness and chroma.The influence of background lightness is stabilized when its brightness changed from white to black.Chroma changed slightly, but the rule does not meet the color induction.CIECAM02 can explain simultaneous induction of lightness, but not the induction of chroma.And it can't predict the color appearance exactly;its background parameter should be further corrected.关键词：cross-media;binocular simultaneous matching;visual matching;CIECAM022|2|0更新时间：2025-07-16
- 摘要：High-speed transmission of LWD signals is difficult to achieve by current technology.The existing downhole mud pulse transmission technology cannot meet the requirements due to its low transmission rate.To cope with this problem, this paper improves while-drilling wireless transmission system with orthogonal frequency division multiplexing (OFDM), which will result in more efficient data transmission.However, the high peak-to-average power ratio (PAPR) of the logging signals in the OFDM will gravely impact its performance.To further improve OFDM drilling wireless transmission system, we propose an SLM algorithm using radix-4 inverse fast Fourier transform (IFFT) to reduce PAPR.In this method, the radix-4-based IFFT performance at point N=4n is partitioned into two stages:transform before k and transform after n-k, between which the phase sequences are multiplied by an input signal.Theoretical analysis shows that, compared with the traditional SLM algorithm, the new SLM reduces the computational complexity almost by 60%.关键词：OFDM while-drilling wireless transmission systems;peak-to-average power ratio (PAPR);selected mapping (SLM);inverse fast Fourier transform (IFFT).2|2|0更新时间：2025-07-16
- 摘要：Frequency-hopping spread spectrum (FHSS) systems, with properties of anti-jamming, anti-intercept, code division multiple access (CDMA), channel sharing, etc, are usually applied in military radio communication, mobile communication, modern radar and sonar echolocation systems.Frequency-hopping sequences (FHS) is an integral part of FHSS systems.Based on the cyclotomy over the finite field and the Chinese remainder theorem, a class of FHSs set with a multiple of prime number length is constructed and the Hamming correlations of the new set are derived by some basic properties of the cyclotomic numbers.The results show that the proposed set is optimal with respect to the Peng-Fan bound and each FHS of the set is optimal or near optimal with respect to the Lempel-Greenberger bound.Furthermore, the previous constructions of optimal FHS sets based on cyclotomy are special cases of this paper.关键词：cyclotomy;frequency-hopping sequence;Hamming correlation;Lempel-Greenberger bound;Peng-Fan bound2|2|2更新时间：2025-07-16
- 摘要：In order to realize the detection for dynamic interpolation error in high-precision optical encoder with non-uniform rotation, a method of analysis based on morié fringe photoelectric signals with non-uniform sampling is presented.First, the real signal waveform is reconstructed with collecting non-uniform signal data of encoder in the method of least squares curve fitting.Then, according to the discrete Fourier transform algorithm analyzing reconstructed signal, meanwhile deducing the calculation expression of frequency, amplitude and phase.The feasibility of the algorithm is assessed with software emulation.Finally, the precise code signal of a 21-bit absolute rotary optical encoder is analyzed.Dynamic interpolation error is obtained based on relationship between the signal parameters and interpolation error.Interpolation extreme errors are +2.41" and -3.08".Experiment result shows that, the signal parameters are obtained with using signal reconstruction and Fourier transform algorithm, that reflects the real morié signal quality.This method can effectively measure the dynamic interpolation error while the encoder is non-uniform rotation, which establishes foundation of real-time detection of encoder error at the actual work site.3|2|1更新时间：2025-07-16
- 摘要：In order to prevent the potential DoS attack against mapping cache under identifier-based universal network, this paper proposes an efficient defense approach based on double-threshold scheme.This approach not only designs a novel puzzle challenge mechanism based on iterative idea to decrease the growth rate of mapping entries, but also presents the trust value algorithm of mapping information to identify and filter out the malicious mapping entries.In particular, our analytical results show that, this approach is efficient and feasible to prevent the DoS attack against mapping cache, and resists the mapping cache overflow.关键词：identifier-based universal network;DoS attack against mapping cache;double-threshold;puzzle challenge;trust value2|2|1更新时间：2025-07-16
- 摘要：In this paper, the strength of LBlock against related-key impossible differential attack is examined.Based on the differential information leakages in sub-key schedule, several sub-key differentials in low weight are constructed, and a 15-round related-key impossible differential distinguisher of LBlock is presented.By extending the distinguisher, related-key impossible differential attacks on 23-round LBlock and 24-round LBlock are presented.The data complexities of the attacks are 265.2 and 265.6 chosen-plain-text, respectively;the computing complexities of the attacks are 266.2 23-round LBlock encryptions and 266.6 24-round LBlock encryptions, respectively;the storage complexities of the attacks are 261.2 and 277.2 bytes of memory space, respectively.The cryptanalysis of reduced-round LBlock are first extended to 23-round and 24-round in this paper.关键词：block cipher;cryptanalysis;LBlock;related-key impossible differential attack3|2|3更新时间：2025-07-16
- 摘要：In recent years, a few escrowable ID-AKA protocols have been proposed, but none of them are provably secure in the standard model while simultaneously having strong security.The main issue is how a simulator is able to deal with reveal-queries without the help of random oracles.In this paper, we presented a method incorporating a built-in security trapdoor function in an escrowable ID-AKA protocol.The security of our protocol relied on the hardness of the decisional Bilinear Diffie-Hellman Inversion problem.Meanwhile, we extended the security game of ID-AKA protocols to resist stronger adversarial powers, which allowed our security game to capture additional security properties such as perfect forward secrecy, ephemeral secrets reveal resistance and so on.Assuming that no adversary can obtain the master secret key and each party in the protocol has at least one uncompromised secret, our scheme is secure.关键词：authenticated key agreement;identity-based cryptography;bilinear pairing;standard model;key escrow2|2|6更新时间：2025-07-16
- 摘要：In order to improve the spam identification speed without sacrificing the accuracy seriously, a novel quick online spam identication method is proposed.Firstly, the conceptions of user positive interest set and user negative interest set are introduced, and emails are classified by combining user interest sets and support vector machine.Secondly, based on the active learning theory, the sample densities of different categories and the improved angle diversity method are used to select the most uncertainly classified samples, and the selected samples are recommended to users for labeling.Finally, the labeled and the classified samples with greatest possiblities are put into the training set, and a novel sample value evaluating function is proposed to filter the redundant samples for generating a new training set.Experimental results show that, the sample labeling burden of the proposed method is small, the spam identification accuracy is high, and the spam identification speed is fast, the high value of the proposed method on online application is proved.关键词：spam;user interest set;support vector machine;active learning;online application2|2|2更新时间：2025-07-16
- 摘要：Chaotic cryptography is a new direction of cryptography, and chaotic sequence complexity is an important index to measure the security of chaotic cryptography.The wavelet packet energy entropy is discussed in this paper to analyze the complexity of chaotic sequence.Firstly, chaotic sequences are decomposed by wavelet packet, and then each frequency band's energy can be computed with wavelet energy entropy calculation method.Thus the complexity of chaotic sequences is finally determined.Comparing the chaotic sequences generated by Logistic, TD-ERCS and Henon, we can discover that the wavelet packet energy entropy has the global statistical property, which doesn't require new parameters for phase space reconstruction.In addition, its calculation method is simple and it does not rely on the chaotic sequence's sampling length and initial values, which can effectively measure the complexity of chaotic sequences.关键词：wavelet packet decomposition;wavelet entropy;chaotic sequence;chaos encryption;complexity4|2|2更新时间：2025-07-16
- 摘要：Through the analysis of the current main of dehazing algorithms, we found that they adapted the divide and conquer strategy to process the luminance and chrominance components, therefore they separated their correlation.To resolve the problem, we performed a sort of method for enhancing and combining the image based on luminance feedback through the human visual characteristics.First, it adjusted the brightness information and lifted the edges and details of original image.Moreover, it regarded the results as constraint conditions which would be used in processing chromatic component for maintain their relevance.Experiments have demonstrated that the proposed method could obtain an excellent result and provide a good practicability and take less time.关键词：photographic enhancement;image dehazing;luminance feedback;zone system2|2|5更新时间：2025-07-16
- 摘要：For non-differential characteristics and easily producing stair effect of total variation in image restoration, the paper presents a second order differential primal-dual model and Newton iterative algorithm.The characteristics of pseudo Huber function are analyzed, primal model is converted into primal-dual model resort to Fenchel transform, Newton iterative algorithm based on the different step length update schemes of primal and dual variables are proposed, and the generalized cross validation principle is given to determine the weight.Synthesized and real images are blurred by point spread function and Gaussian noise, the comparison experiments among the proposed scheme with fast Fourier transform algorithm, fast shrinkage-thresholding algorithm, alternating projection algorithm and quasi-Newton algorithm are carried out.Simulation results show the proposed algorithm can protect image edges, alleviate stair effect, and achieve lower relative error and deviation, higher peak signal to noise ratio and structural similarity index measure, and better visual effect.关键词：primal-dual model;image restoration;energy functional;algorithm convergence3|5|2更新时间：2025-07-16
- 摘要：In order to solve the problem that lack of coordination between image fusion and segmentation methods.A cooperation framework for multisource remote sensing images fusion and segmentation was proposed in view of the advantage that data assimilation system can integrate its model operator and observation operator, and it can be optimized itself.Under this framework, two fusion methods based on contrast Pyramid transform and nonsubsampled contourlet transform were used as model operator and observation operator, the objective function was composed of probabilistic rand index to evaluate segmentation effect and particle swarm optimization with crossover operator was employed.The framework can adaptively adjust the parameters of segmentation algorithm according to fused images, and can use the segmentation results to guide the optimization of fused images, so as to make image fusion and image segmentation cooperate with each other.Two groups of experiments validate the effectiveness of the framework.关键词：image segmentation;image fusion;particle swarm optimization algorithm;data assimilation2|2|2更新时间：2025-07-16
- 摘要：Recently, the Hessian Nuclear norm regularization method has been a preferable higher order regularization scheme for image restoration, but with the Hessian Nuclear norm regularization term been highly non-linear and non-differentiable, image deblurring and denoising processes are highly coupled so that their minimization algorithms are with highly computational complexity.In this paper, we employ variable splitting to design a fast alternating iterative minimization algorithm with closed-form solutions for image restoration, in which we separate image restoration into image deblurring and denoising.Furthermore, we show the convergence of our proposed algorithm.Finally, experimental results demonstrate the effectiveness of the proposed method which consists in not only giving the improved performance in terms of peak signal to noise ratio (PSNR), but also exhibiting a much faster convergence rate than the previous majorization-minimization (MM) method for Hessian Nuclear norm regularization based image restoration.关键词：Hessian Nuclear norm;image restoration;alternating iterative algorithm3|2|2更新时间：2025-07-16
- 摘要：Differential analysis is a major method to understand the process of biological evolution and the progress of diseases.Recently, differential analysis based on graph has been a hot area in system biology.Since Przulj proposed the conception of graphlet and graphlet orbits, both of them have been used in various network analyses.In this paper, we proposed two measures based on graphlet orbits, and we used them to mine within module differential co-expresssion clusters and module to module differential co-expression clusters.Applications on the data of mice for 16 months and 24 months have shown that most of the clusters are significant enrichment in some GO terms related with aging.关键词：graphlet orbit;differentially network;aging2|2|1更新时间：2025-07-16
- 摘要：During the diving movement for highly squinted synthetic aperture radar (SAR), the echo is coupled greatly between azimuth and range, invariance in azimuth is not accurate, which are caused by high vertical velocity and acceleration, making SAR imaging difficult to process.Due to these issues, a frequency phase filtering algorithm (FPFA) is proposed.First, the accurate 2-D spectrum can be got via the method of series reversion (MSR), the range walk will be eliminated in the time domain and in the frequency domain the range curvature removed.Then, a frequency filtering phase is leaded into frequency domain in order to correct the dependence of the FM rates.At last, the signal is focused in the Doppler domain by Spectral Analysis technique (SPECAN).As the whole procedure only involves short fast Fourier transforms (FFTs and complex multiplications without interpolation, the FPFA is computationally efficient and facilitates hardware real-time implementation.The simulated results and raw data processing validate the effectiveness of the proposed algorithm.关键词：high squint SAR;subaperture;diving movement;FPFA;MSR;SPECAN2|2|4更新时间：2025-07-16
- 摘要：A direction of arrival (DOA) finding method in passive radar is proposed based on amplitude comparison of signals between different beams.By the use of an 8-element uniform circular array, 18 beams covering the whole space for targets surveillance are formed based on beam pattern synthesis technique.On the process of beam scanning, clutter cancellation and match filtering, DOA is estimated on the range-doppler map.Performance of the original method is analyzed when reference signal is contaminated by target echoes, where the performance of the original method degrades rapidly.An improved method is proposed for the case when reference signal is contaminated by target echoes.Experiments show that the improved method well outperforms the original method when reference signal is contaminated by target echoes.关键词：passive radar system;amplitude comparison angle measurement;beam pattern synthesis technique;improved direction of arrival (DOA) finding method;uniform circular array2|2|4更新时间：2025-07-16
- 摘要：Based on the expectation-maximization (EM) algorithm, a new method for broadband direction of arrival (DOA) estimation and blind source separation is presented in this paper.First, we establish a likelihood function in the frequency domain by jointly using all frequencies information.Then, based on this function, the E-step and M-step in the frame of broadband EM algorithm are derived.Finally, we jointly estimate DOAs and sources through EM iteration compute.Moreover, through analyses the convergence of EM algorithm, we set adapted angle search space for DOA estimation, which reduce the computations of our algorithm.Compare to the traditional method, more effective information are applied in our algorithm.Therefore, the proposed algorithm has more advantages for DOA estimation and source separation.Simulation results demonstrate our algorithm is effective.关键词：broadband signal;EM algorithm;DOA estimation;source separation2|2|7更新时间：2025-07-16
- 摘要：Two classes of parallel computing digital filter structures for allpass systems are proposed.Based on the state-space approach, the principle of parallel processing is derived.The expression of roundoff noise gain for the proposed structures is obtained.For an Nth order allpass digital filter, it yields a roundoff noise gain of 4N if it is realized using anyone of our proposed structures.A numerical example is presented to verify the performance and implementation complexity of the proposed structures.Compared with several traditional filter structures, it is much more efficient and high-throughput for real-time implementation due to the parallel processing.关键词：digital filters;parallel computing;filter structure;roundoff noise gain;finite word length2|2|1更新时间：2025-07-16
- 摘要：Opposition-based learning mechanism (OBL) only searches a fixed point in the opposite space.In order to overcome this defect, a rotation-based learning mechanism (RBL) is proposed by introducing the rotation operation to OBL.The RBL can search any point in the rotation space by adjusting the rotation angle parameter, and has a stronger exploration capacity and multiple application modes.By embedding the RBL and self-adaptive parameter control mechanism into differential evolution algorithm (DE), the rotation-based differential evolution algorithm (RDE) is introduced.Simulation experiments conducted on a set of widely used benchmark functions verify the effectiveness of RBL mechanism.Compared with several well-known DE variants, the RDE algorithm has a significant competitive advantage in optimizing performance, and has good applicability.关键词：evolutionary computation;differential evolution;rotation-based learning;opposition-based learning2|2|5更新时间：2025-07-16
- 摘要：The control of radiation power of fighter tracking is a main approach to RF stealth attack.Firstly, RF stealth ability can be measured by the intercept probability model.Secondly, a single radiation power real time optimization model is constructed with the restriction of the radar detection and the optimization target of the minimized intercept probability.Thirdly, a real time control method of radar single radiation power based on RF stealth when tracking is proposed by solving the model.Finally, the correctness of the model is proved by computer simulation.关键词：RF stealth;radiation power;control method;intercept probability2|2|16更新时间：2025-07-16
- 摘要：Based on the analysis of the standard vehicle routing problem, we proposed a multiobjective real-time vehicle routing problem model, referred as MR-VRPCS.The MR-VRPCS considers the traffic factors, customer demand dynamic change and customers' satisfaction.As we know, the ITO algorithm has low efficiency and poor convergence performance on the discrete combinatorial optimization problems.Therefore, we apply the universal framework of ITO and introduce the Ant Colony Optimization algorithm, which has got depth studied in vehicle routing problem, to design the ITO-Ant Optimization algorithm.We analyze the IAO algorithm's parameter setting problem by the method of orthogonal experiment.Finally, we use the Solomon benchmark test data to prove the effectiveness of the IAO algorithm, and adjust the standard test data to the MR-VRPCS model's, and resolve it with IAO.The experimental results show the feasibility and effectiveness of the proposed model and algorithm.关键词：dynamic vehicle routing problem;ITO algorithm;ant colony algorithm;customers' satisfaction2|2|12更新时间：2025-07-16
- 摘要：Program comprehension is the key to provide insight into large scale object-oriented programs in the testing and maintenance activities.It's a reasonable way to select and start with the key classes.To identify the key classes in a system automatically, we propose a technique to measure the importance of each class based on Unique Input/Output sequence.Firstly, we abstract the software system as a finite state machine model, and then we compute the Unique Input/Output sequence of the finite state machine and converse the Unique Input/Output sequence to a state transform tree by a proposed algorithm.Finally, we traverse the state transform tree to calculate the importance of the classes.The case studies show the effectiveness of our technique.关键词：key classes;finite state machine;UIO sequence;program comprehension2|2|1更新时间：2025-07-16
- 摘要：For reducing the computation complexity of the Proportional Conflict Redistribution No.5 (PCR5) with the framework of Dezert-Smarandache Theory (DSmT) for evidence fusion problems of mulitple focal elements and remaining high accuracy, a Dezert-Smarandache Theory (DSmT) approximate reasoning method on the condition of non-zero mulitple focal elements is proposed.The method avoids the informaiton loss caused by decoupling of the existed DSmT approximate reasoning method.The information fusion problems of non-zero mulitple focal elements based on not only the Shafer model but the hybrid-Dezert-Smarandache (DSm) model can be effectively processed by the proposed method.Finally, simulation results show that in different conditions, the proposed method can get more similar results with DSmT+PCR5 method and need less computation complexity compared to the existed method.关键词：evidence theory;approximate reasoning;Information fusion;hybrid-DSm(Dezert-Smarandache) model;dezert-smarandache theory2|2|2更新时间：2025-07-16
- 摘要：Boolean network has been a major model to study gene regulatory networks.Lots of work have been focused on inferring networks from time-series data and designing potential intervention policies.However, one important problem still remains unsolved, that is the generalization of Boolean function.In general, the inference algorithms always assume a random Boolean value for the unobserved states.As many theoretical and experimental results support that gene regulatory networks lie between the boundary of ordered and disordered regimes, we studied three generalization methods:the majority rule, bias-based and mutual information-based methods.Results both on simulation networks and melanoma network show that reasonable generalization can improve both the steady-state distribution distance and the sensitivity error.And among the three methods, the mutual information-based method performs better than the other two.关键词：gene regulatory network;Boolean network;dynamic behavior;generalization2|2|0更新时间：2025-07-16
- 摘要：The scheduling problem of actual semiconductor production process is of large scale, uncertainty, complicated constraints and multiple objectives, and the optimization of the process depends upon a timely and efficient dynamic scheduling.Considering the multi-reentrant characteristic of semiconductor wafer fabrication and the influence of rush orders upon regular orders, a Drum-Buffer-Rope (DBR) theory and Adaptive Neuro-Fuzzy Inference System (ANFIS) integrated dynamic scheduling algorithm is proposed.Firstly, a DBR optimization algorithm based on the combination of releasing control and lots scheduling is designed, aiming at maximizing the effective capacity of bottleneck equipment and ensuring the wafer fabrication load in a balance.Secondly, using the historical and real-time data obtained in the wafer fabrication, a prediction model of rush orders is constructed on the basis of ANFIS.Thirdly, the prediction result is integrated with the DBR algorithm combined with the experts' knowledge and practice experiment, to adjust the wafer fabrication before rush orders come, which guarantees that the rush order could be completed effectively, and reduces the interplay between the rush order and the regular one.The proposed scheduling algorithm is simulated on a certain semiconductor wafer fabrication system, and the result shows that the method can realize the multi-objective optimization and provide reference to the practical semiconductor wafer fabrication scheduling.关键词：semiconductor wafer fabrication;dynamic scheduling;rush order prediction;drum-buffer-rope3|2|2更新时间：2025-07-16
- 摘要：The three-phase PWM converter is widely used due to the advantages of its simple topology, low voltage stress on switching devices and high efficiency.Conventionally, double closed-loop PI (Proportional-Integral) controllers are used for three-phase PWM converters.However, PI controllers have two main problems:difficulty to adjust the parameters of the controller and lack of adaptability to the system parameters variations.To deal with these problems, a load-adaptive control method and a feedback linearization control method are proposed for the voltage outer-loop and current inner-loop control of the three-phase PWM converter, respectively.The proposed method avoids the difficult and time-consuming parameters adjustment problems of the conventional PI controllers design, and improves the performance of the system.The simulation and experiment results show that, compared to the traditional PI control and the existing feedback linearization control method, the proposed control method uses less adjustable parameters which are easy to be chosen, and provides less output voltage perturbation, less recovery time and stronger adaptivity with respect to load variations.关键词：PWM rectifier;feedback linearization;adaptive control;load perturbation2|2|3更新时间：2025-07-16
- 摘要：MEMS-based smart sensing system ("Smart Dust") with ultra small size and low power consumption is integrated by multi-functional sensors including information detection, process and interexchange, it also contains the composite energy system with energy harvesting system and power management programs.Such device therefore is able to work either autonomously or collaboratively.This paper is to clarify fundamentals and applications of smart dust technology, followed by its architecture design of such device.And then, focus will be given on several critical issues and technical difficulties by the development trajectory and interrelated technologies of smart dust.Finally, the feasibility to achieve such integrated multi-function sensing system with MEMS manufactory engineering techniques will be addressed.关键词：MEMS(micro electro mechanical systems);smart dust;composite energy;information process2|2|3更新时间：2025-07-16
- 摘要：Monte Carlo Localization(MCL) has a decisive role for the mobile nodes'localization in Wireless Sensor Networks(WSN).In order to improve the positioning accuracy, an improved algorithm called Sequence Correlation Optimized Monte Carlo Localization(SCMCL) is proposed.Adopting the mobile node's location based on the received signal strength indicator(RSSI)as the new sampling center, SCMCL can optimize the sampling area of MCL and etc.The signal values are stored as a target sequence, and by comparing the correlation values between samples' sequences and the target sequence, samples can be filtered out.Also the correlation values are used as the weighted standards to calculate coordinates of the mobile nodes.Extensive simulation results confirm that the new localization approach outperforms MCL and etc.The SCMCL algorithm reduces the localization error by about 10% under the same density of beacon nodes and the maximum speed of mobile nodes.关键词：Wireless sensor networks;mobile nodes' localization;Monte Carlo;sequence correlation2|2|5更新时间：2025-07-16
- 摘要：Adopting the filtering mechanism of dynamic filtering windows installed on sensor nodes to process top-k queries is an important research direction in wireless sensor networks.Existing algorithms based on filters consume a vast amount of energy on filter updating.As updating filters consume a large amount of energy, a top-k query processing algorithm adopting adaptive filters named FUGPR based on Gaussian process regression is provided.When the filters change, the sensor readings are predicted to calculate the updating costs of filters, then FUGPR decides whether the filters need to be updated or not.Thus, the energy consumption for updating filters is decreased.Experimental results show that our approach can reduce energy consumption efficiently for updating filters on real and simulated datasets.关键词：filtering windows;Wireless sensor networks;Top-k;FUGPR(Filter Updating based on Gaussian Process Regression)2|2|0更新时间：2025-07-16
- 摘要：Since the complex coupling between end-fire antenna elements, high side lobe level is produced without high gain when the space of the end-fire antenna array is less than 1.5 λ. In order to restrain the coupling, the space of the array should be increased but the grating lobe is produced concurrently.For this reason, taking the 10-monopole plate end-fire antenna as the array element arranged with large spacing and virtual elements interpolated, an echo algorithm of virtual end-fire antenna array based on modified least squares estimation was put forward.Using this algorithm, the echo signals of virtual elements were obtained in order to restrain the grating lobe.And then, the far field patterns of the virtual end-fire antenna array were compared and analysed between results calculated by traditional least squares and modified least squares.With this understanding, it can be proved that the new algorithm has superiority over the traditional one and the validity in grating lobe restraining and side lobe reduction can be confirmed.关键词：end-fire antenna;virtual element;grating lobe restraining;modified least squares estimation2|3|1更新时间：2025-07-16
- 摘要：As the existing memristor emulator is excessively complicated, a simple generalized memristor emulator is proposed.The emulator is a first order memristor equivalent circuit, which is merely composed of a diode bridge and a series RL filter.The mathematical model of the input port voltage-current relation of the generalized memristive emulator is established, and the corresponding characteristic analyses are performed.The results by numerical simulation and circuit experiments indicate that the emulator meets the definition of generalized memristor, and can exhibit the fingerprint of pinched hysteresis loop of a memristor.The proposed generalized memristor emulator has simple circuit structure and no grounded restriction, which is convenient for circuit implementation and application access.关键词：memristive emulator;diode bridge;RL filter;pinched hysteresis loops4|2|6更新时间：2025-07-16
- 摘要：A parallel resonant DC link soft-switching inverter with a single storage capacitor-assisted commutation was proposed to reduce switching loss of the hard-switching inverter.The single storage capacitor was used to supply energy in the resonance process.DC-bus voltage decreased to zero periodically to realize zero-voltage operation of all main switching devices in inverter.Auxiliary switches were also operated under zero voltage switching or zero current switching in the commutation process.More storage capacitors were not between the DC buses and there was no center tap potential variation problem.The operation principle was analyzed via the phase-plane analysis technique.A 5kW laboratory prototype was built.The experimental results demonstrated that soft-switching operation of all main switching devices could be realized.Therefore, the soft-switching inverter presented can effectively reduce switching loss and improve efficiency.关键词：storage capacitor;commutation;inverter;soft-switching;resonant2|2|15更新时间：2025-07-16
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