最新刊期
卷 45 ， 期 7 ， 2017
- 摘要：The current way of service deployment using network middleware is too rigid to support the future demand for a variety of network services.Aiming at this problem,this article puts forward a service routing mechanism supporting the customized scheduling in the control layer and the on-demand deployment in the data plane,which is based on the introduction of atomic service from the reconfigurable information communication basal network.According to the operation of this mechanism,this paper models the service routing problem as the multiple target optimization problem under the multi-restrictions,and designs the distributed selection probing algorithm,which constructs the optimal service path through the process of distributed probe selection.Compared with the existing algorithms,the results of simulation show that the service routing mechanism improves the success rate of the service requests and network resource utilization and reduces the service deployment costs.关键词：service routing;middleware;atomic service;distributed selection probing192|456|1更新时间：2025-07-16
- 摘要：Considering the high computational burden of the previous kernel spectrum sensing methods,this paper proposes a computationally more efficient Nystrom subspace matching (NSM) algorithm.Based on the independent identically distributed observations,the subset is randomly chosen to implement the Nystrom approximation and reconstruct the related kernel features in a high-dimensional Euclidean space.Then,the related Nystrom subspaces respectively for the primary users and the secondary users are modified,and the Frobenius range between these two subspaces can be computed to determine whether the primary users exist or not.Compared to the previous kernel subspace matching methods,the novel version reduces the computational complexity by 66% while provides almost the same detection performance.Computer simulations are conducted to evaluate the performance of the proposed algorithm.关键词：spectrum sensing;kernel space;nystrom approximation;feature subspace matching84|302|1更新时间：2025-07-16
- 摘要：When the protocol of the communication system is unknown,the analysis of space-time block code parameter is a key research issue for blind receive of Multiple Input Multiple Output signals.Under the circumstance,the model of space-time block code and the receiving signal model are discussed.The relationship between the rank of covariance matrix of receiving signals and the code parameter is revealed.Making use of the distribution of maximum eigenvalue of noise subspace in random matrix theory,the rank of covariance matrix could be exactly estimated,and then the code parameter could be obtained.Simulation results show that the proposed algorithm could not only estimate the space-time block code parameter,but also recognize the first symbol of the code under the condition of unknown code set.关键词：space-time block code;multiple input multiple output;code parameter analysis;random matrix theory199|388|2更新时间：2025-07-16
- 摘要：In order to balance the contradiction among network bandwidth,video quality and subscriber's real-time access,a new approach to progressive description of video streaming based on visual saliency computation is proposed in this paper.On the basis of video content analysis and comprehension,scene classification and Visual Sensitive Region(VSR) extraction are performed firstly.Secondly,frame importance according to coding information and slice data importance are determined.Finally,based on visual saliency computation,a new approach to progressive description of video streaming adapted to network bandwidth and quality scalability is proposed in this paper.Applying MGS Coding,experimental study is performed on video sequence with salient region and cluttered regions in network simulation platform,the experimental results show that the progressive description based on visual saliency computation proposed in this paper is accurate and effective.关键词：video streaming;visual saliency computation;progressive description;MGS coding;bitstream extraction128|448|2更新时间：2025-07-16
- 摘要：Furnace pressure is one of the important variable to be controlled in the process of glass furnace operation.Owing to the influence of a large number of uncertainties,existent control algorithms tend to produce overshooting and frequent fluctuation in follow-up.Considering that simplified T-S model (STS) has a strong self-adaptive learning capability and subtractive clustering is able to handle the unsteadiness in the optimal model structure,this paper proposes,for the purpose of furnace pressure control,a generalized fuzzy nonlinear prediction approach by combining subtractive clustering and STS.This approach allows a quick approximation of the object following jumps of furnace pressure and may eliminate system unsteadiness caused by jumps.Additionally,in respect of excessive overshooting in furnace pressure step following-up,a control method is designed based on the improved STS model and integrating global optimal rolling optimization function with optimal control increment algorithm so that overshooting is restrained essentially.This approach involves little computation work and is easy to implement.关键词：furnace pressure control;simplified T-S model;fast generalized predictive control;overshoot suppression98|207|0更新时间：2025-07-16
- 摘要：In the LTE-Advanced standards,to satisfy the low-power dissipation requirement in mobile scenarios,a decoder with small memory size has attracted extensive attention.By decomposing the trellis diagram of the adopted turbo code,this paper proposes a memory reduced decoding architecture based on reverse recalculation.A modified Jacobian logarithm is specially investigated for the reverse recalculation,and the reverse recalculation in logarithmic domain and the realization structure are also presented.It shows that at the price of low redundant calculation complexity,the memory size is reduced by 50%,while the decoding performance is very close to that of the Log-MAP algorithm.The proposed decoding scheme is superior to other decoding architectures in terms of dummy computation complexity,memory size and decoding performance.关键词：LTE-advanced standard;Turbo code;MAP algorithm;memory reduced decoding architecture97|219|0更新时间：2025-07-16
- 摘要：Secure communication in decode-and-forward cooperative networks with untrusted relay in the presence of direct links is investigated in this paper.In the considered system,one base-station is selected for secure transmission to the destination node with the aid of an untrusted relay node.Three selection criteria are proposed to improve the secrecy capacity based on both the direct links and the relaying links.The exact close-form expressions and corresponding asymptotic expressions on secrecy outage probability are derived.From the asymptotic expressions and simulation results,the sub-optimal criterion has the same performance with the optimal criterion.Furthermore,the partial selection criterion achieves the full diversity gain.关键词：untrusted relay;user selection;physical-layer security;relay networks;secrecy outage probability196|358|2更新时间：2025-07-16
- 摘要：Based upon the research of discrete ternary particle swarm optimization,the ternary diversity particle swarm optimization (TDPSO) is proposed for optimization of mixed polarity reed-muller circuits (MPRM).According to the characteristics of mixed polarity XNOR/OR expression and probabilistic transition rules,motion equation of discrete ternary particle swarm optimization (DTPSO) is deduced.On the basis of DTPSO,a TDPSO algorithm is proposed by introducing extensive learning and ternary mutation.A mathematic mode for area and low power dissipation is built and mixed polarity conversion of XNOR/OR circuits is improved.Then on the basis of parameter mapping relations between particle and polarity,TDPSO is introduced to search the best polarity for power and area of MPRM circuits.Finally,the proposed algorithm is tested on ten circuits from MCNC benchmark circuits,and the experimental results show that the algorithm significantly outperforms the reported method.关键词：TDPSO algorithm;MPRM circuits;optimization;polarity conversion162|282|5更新时间：2025-07-16
- 摘要：This paper introduces the design and implementation of equalizer in the backplane communication system.The equalizer uses a combination of continuous time linear equalizer (CTLE) and 2 tap decision feedback equalizer (DFE) to cancel both pre-cursor and post-cursors ISI.In the design,CTLE compensates with different frequencies of the loss of the channel by employing split-path equalizer,reduced the circuit area and power consumption.A half-rate speculative architecture is adopted to improve the transmitted data rate in DFE by relaxing the timing constraint on the first feedback path.An analog implementation of the LMS algorithm is used to control the DFE tap coefficients.Circuit using IBM 0.13μ m BiCMOS process design and implement.Measured results show that the eye is completely closed when 24Gb/s signal through 18 inches backplane,the horizontal opening degree of equalized eye reached 0.81UI.The entire equalizer chip area including pads is 0.78×0.8mm2,and consumes 624mW with the supply voltage of 3.3V.关键词：backplane communication;continuous time linear equalizer(CTLE);decision feedback equalizer(DFE);ISI109|348|6更新时间：2025-07-16
- 摘要：The failure behavior and modes of board level solder joints under coupling of vibration and thermal loads were studied based on the orthogonal experiment design method.The accelerated life tests with different temperature (T),power spectral density (PSD) and frequency (V) were conducted by using a L9(34) mixed-level orthogonal array.The results show that the degree of influence that the three factors have on the reliability of solder joints is T>PSD>V.The temperature is the main factor that can affect the failure modes of solder joints significantly.The crack initiates in the intermetalic compound (IMC) and propagates into the bulk solder gradually as the temperature rise.The failure mode evolves from the brittle fracture to ductile fracture.Based on the analysis of the failure data,a fatigue life model of solder joint was developed by using the polynomial fitting method,according to the relationship between the logarithmic fatigue life value and the strain range of the back side of the printed circuit board.The fitting results indicate that the model can evaluate the fatigue life of solder joints under the coupling of the vibration and thermal loads accurately.关键词：coupling of vibration and thermal loads;solder joint;failure mode;failure life256|452|11更新时间：2025-07-16
- 摘要：A tunable single-passband microwave optical filter is realized based on the stimulated Brillouin scattering and phase modulation.When only one pump signal is introduced,the tuning range of the filter is 0.5 to 18.3GHz.When only one laser is used,and pump signal is achieved by intensity modulation of the microwave signal added at intensity modulator,the stability of the filter system is better than that of the system whose two lasers are used as light carrier and pump signal respectively.When introducing two pump signals whose frequency interval equals the two times as large as the stimulated Brillouin frequency shift,the tuning range of the filter is 0.9 to 31.3GHz.关键词：microwave photonic filter;stimulated Brillouin scattering;phase modulation;single passband207|351|2更新时间：2025-07-16
- 摘要：For the multi-sensor systems with uncertain-variance linearly correlated white noises,based on the mini-max robust estimation principle,by the Lyapunov equation approach,the two classes of guaranteed cost robust covariance intersection(CI) fusion Kalman estimators (predictor,filter,smoother) are presented based on the parameterization representation of the uncertain noise variance perturbations.Both the minimal upper bound and the maximal lower bound of the accuracy deviations are given.It is proved the robust accuracy of the guaranteed cost CI fuser is higher than that of the original CI fuser,and is higher than that of each local estimator,and the geometric interpretation of accuracy relation is given by the covariance ellipses.A simulation example applied to tracking system verifies the correctness and effectiveness of the proposed method.关键词：uncertain noise variances;linearly correlated noises;covariance intersection fusion;Lyapunov equation approach;tracking system141|814|1更新时间：2025-07-16
- 摘要：In view of such problems as temporary loops,blackholes,violations of access control policy and so on during state transitions in OpenFlow networks,we proposed a consistent rule update scheme based on heuristic scheduling.First,we divided operations of an update into some sub-updates and used parallel network property verification technique to construct a dependency graph for each sub-update.Second,we aggregated several update operations of the same sub-update to reduce complexity of scheduling.Then,we designed heuristic update scheduling algorithm.By adopting an alternative strategy for additions and deletions of rules,it could reduce storage cost in switches.Furthermore,by establishing a mechanism to update and monitor concurrently,it could improve efficiency of rule update.Simulation experiments on the updating time cost and the rule storage cost of switches during updating process are conducted,which verify the effectiveness of our scheme.关键词：Open Flow networks;consistent rule update;heuristic scheduling86|307|2更新时间：2025-07-16
- 摘要：This paper proposes a joint sparse spectrum reconstruction-based motion artifact reduction algorithm for Photoplethysmo-graphy (PPG) signals to overcome the artifact removing problem in the PPG sensor data collection.Firstly,our algorithm constructs a spectral matrix,using PPG signals and acceleration signals during the same time period.The sparse characteristics of the spectral matrix and its rows are extracted.Secondly,we use the compressive sensing to model the motion artifact removing process in PPG signals as a joint sparse signal reconstruction process.Then this process is further modeled as an optimal model.We exploit the iterative method to obtain the optimal solution to the model.Finally,we combine the spectrum subtraction to remove the motion artifact in PPG signals.In the result,we can effectively decrease the impact of the motion artifact on PPG signals.Simulation results demonstrate that the algorithm proposed in this paper can effectively remove the motion artifact in PPG signals and attain the better noise reduction performance.关键词：photoplethysmography (PPG);heart rate monitoring;sparse signal reconstruction;compressive sensing135|380|2更新时间：2025-07-16
- 摘要：To optimize the design of high capacity satellite on board label switches,a new flow control mechanism and a new satellite on board switch structure are proposed.According to the buffer utilization of different input ports of on board switch,the terrestrial network gates can adjust the scheduling weights of output for different down ports of satellite on board switch to avoid buffer overflow.The relationship of buffer depth,adjustment threshold of on board switch and the scheduling weights in terrestrial gates are simulated with NS2 under the condition of long propagation delay,which will be helpful to the design of high-throughput on board label switches and the design of terrestrial network.关键词：satellite on board label switch;flow control;class-based queueing(CBQ);network simulator2(NS2)67|192|0更新时间：2025-07-16
- 摘要：Aiming at the drawback of low identification accuracy in single trial P300 feature extraction and classification,a parameter model method based on Matrix Grey Modeling to extract P300 feature was proposed to raise the recognition accuracy of the visual evoked potential P300 in single trial classification.Firstly,EEG signal was preprocessed,and then channel set selection was applied.After that,the model parameters of Matrix Grey Modelling for each epoch was connected as the feature vector and were input to the SVM classifier.The experimental results show that the average accuracy of single trial P300 across all the subjects is 91.43%,and the accuracy can be up to 97.87% if 3 times averaging is used.关键词：P300 feature extraction;matrix grey modeling;single trial identification339|364|1更新时间：2025-07-16
- 摘要：To improve the performance of image retrieval,and accelerate the speed of image retrieval in content-based image retrieval and reduce the "semantic gap" between visual low-level features and high-level semantic,relevance feedback image retrieval based on teaching-learning-based optimization algorithm is proposed (TLBO-RF).Considering the specificity of image retrieval and the advantage of the PSO,the update strategy of individual is modified in TLBO,the center of the relevant images is regarded as the teacher and the personal best is introduced,which makes the algorithm converge fast to the region of relevant images that the user is interested in.TLBO-RF is compared to two state-of-the-art RFs based on evolutionary algorithm on two benchmark images.The results show that TLBO-RF has obvious advantage in comparison with other two algorithms,not only increases the performance of image retrieval,but also improves the image retrieval speed,and can better meet the user needs of image retrieval.关键词：content-based image retrieval;relevance feedback;TLBO;PSO242|339|1更新时间：2025-07-16
- 摘要：To achieve objective image correction quality assessment results that are consistent with subjective perception,we create an Image Color Correction Database (ICCD).ICCD contains a variety of types and scales of color difference.The types of color difference include the differences in brightness,hue,saturation,exposure,contrast and R and G channels.Each type has three different scales.We select six state-of-the-art color correction algorithms to perform color correction for each target image.Then we design and conduct user study to get users' Mean Opinion Score (MOS).Based on ICCD,we evaluate the performance of six color correction algorithms.For most of types and scales of color difference,Pitie's iterative color distribution transfer algorithm performs best.We also evaluate the 14 objective image quality assessment metrics and pick out three better assessment metrics that achieve better consistency with MOS than existing methods.关键词：color correction;mean opinion score;iterative color distribution transfer;color consistency;image quality assessment43|305|2更新时间：2025-07-16
- 摘要：This paper proposes a methodology for the design and optimization of CDN (Clock Distributed Network) in full custom FPGA systems based on parameterized models of the structural sizes of the key components of CDN systems.The characteristic model proposed herein divides structural sizes into two categories:topology structure,and circuit and interconnect,and provides the design methodology of these two types of sizes.The paper establishes two sets of structure parameters for H-tree,fish-bone and mixed clock networks in standard CMOS 0.13 μm technology,each representing CDN with or without optimizations.And then we compares the performance in terms of transmission delay,clock skew,power consumption,chip area,among a multitude of other parameters.Experiment results indicate that mixed structure results in the greatest reductions of transmission delay and clock skew by 20.89% and 63.20%,respectively;fish-bone structure achieves the best reductions in chip area by 50.14%,while H-tree structure reduces in transmission delay and power consumption by 7.37% and 8.33%,respectively,which strongly confirms the proposed design and optimization methodology.关键词：FPGA;clock distributed network (CDN);parameterized;modeling55|328|0更新时间：2025-07-16
- 摘要：The well-known fuzzy c-means algorithm (FCM) has been regarded as a useful tool for image segmentation application.However,it is still insufficient robustness to image noise due to the distance function selection in FCM.In this paper,we propose a new hierarchical fuzzy algorithm to make the traditional fuzzy c-means more robust to image noise and outliers.We introduce a more flexibility function which considers the distance function itself as a sub-FCM with student's t-distribution.Thus,our hierarchical model is general and flexible enough to deal with outliers and noises.Our algorithm proposed in this paper can be extended to any other FCM-based models to achieve superior performance.Experimental results demonstrate the improved robustness and effectiveness of the proposed algorithm.关键词：hierarchical algorithm;fuzzy c means;image segmentation;student's t-distribution32|339|5更新时间：2025-07-16
- 摘要：Due to the difficulty in detecting reflection symmetry axis,a detection algorithm based on improved mean-standard deviation curve descriptor (MSCD) is proposed.Firstly,the proposed algorithm improves the MSCD so that its mirror reflection invariance can guarantee the accurate detection of the symmetrical curve pairs.Then the distance constraint and Hough transform is used to gain local symmetry axis of the image.Finally,final symmetry axis can be acquired by merging the local ones.Experimental results show that the proposed algorithm can realize the symmetric axis detection for image with both single symmetric axis and multi ones.Besides,it can locate the image symmetry axis precisely and robustly under brightness changes,contrast changes,noise pollution,fuzzy and deformations.关键词：mean-standard deviation curve descriptor;curve matching;reflection symmetry25|227|1更新时间：2025-07-16
- 摘要：Hashing is a key technique to achieve fast nearest neighbor search in high-dimensional,massive datasets.Among various methods,Iterative Quantization (ITQ) and Isotropic Hash (IsoHash) are probably the most popular ones due to their high retrieval accuracy.However,as the constraints imposed on the rotation matrix are too weak,the optimization problem in ITQ is severely under-deterministic and therefore easy to cause over-fitting.In IsoHash,the isotropic projection matrix is updated in a manner that is completely independent of the binary hash codes,and thereby the quality of the produced hash codes may be depressed.To address these issues,this paper proposes an isotropic iterative quantization hashing method,which extends the formulation of ITQ by incorporating properly the isotropic prior adopted in IsoHash.In our method,the hash code matrix and rotation matrix are updated alternately in an iterative fashion.Experiments are conducted on three benchmark datasets,CIFAR-10,22K LabelMel and ANN_GIST_1M.The results show that the proposed method performs better than the competing methods in terms of precision,recall and mAP.关键词：hashing;large-scale image retrieval;isotropic prior;iterative quantization40|393|2更新时间：2025-07-16
- 摘要：Secure multi-party computation is a focus in the international cryptographic community.This paper studies how to privately compute the minimum of some private numbers.We have not read a solution to this problem.In this study,we introduce a new encoding scheme,and then,based on this new encoding scheme and ElGamal multiplicatively homomorphic encryption scheme,using secret sharing and threshold decryption,devise protocols for this problem.We prove,using the simulation paradigm,that these protocols are secure in the semi-honest model.These protocols can resist collision attack.Based on the computing methods for minimum problem,secure multi-party computation for maximum and union of sets can also be solved.Efficiency analysis shows that these schemes are efficient.关键词：cryptography;secure multi-party computation;minimum;homomorphic encryption;secret sharing;threshold decryption132|574|8更新时间：2025-07-16
- 摘要：With the popularity of social networks,social worms have constituted one of the major security threats.This type of worm spreads fast in Internet networks based on topology information and social engineering.There are two critical problems of previous works,which result in underestimating the scale of infected network and lacking a comprehensive and accurate abstraction for human behaviors.These are structural imperfection of network topology and one-sidedness of the propagation model.To address the above problems,this paper proposed a novel simulation model of social worms.We more accurately and comprehensively abstracted the relationship between social logical layer and actual physical layer in a hierarchical network,and characterized the social worm propagation through the temporal characteristic of human mobility.Experimental results show that the impacts of user behaviors,topology parameters and different recovery processes on the propagation.Meanwhile,we give the qualitative analysis of the spread ability.关键词：social worm;propagation behavior;human mobility;simulation modeling142|325|0更新时间：2025-07-16
- 摘要：E-commerce Business Process Nets (EBPNs) are a novel formal model for describing and validating e-commerce systems at design and application level,integrating data,control flows,and relevant attributes.Data errors and non-determinacy of the data states during the trading process can be depicted with the help of EBPNs.For static and dynamic properties of EBPN,reachability analysis methods are further studied,and construction algorithm of Reachability Data State Graph (RDSG) and related conclusions are given.In order to reduce the complexity of analyzing EBPN,referring to the program slicing,slicing of EBPN is studied.Slicing criterion and algorithm are defined and constructed.Slicing technology of EBPN can be used to reduce the complexity of analyzing EBPN.关键词：E-commerce;business processes;Petri nets144|434|1更新时间：2025-07-16
- 摘要：The current remaining useful life (RUL) prognostic approaches for stochastic degradation device subject to imperfect preventive maintenance suffer from challenge of low accuracy.A new degradation modeling and RUL prognostic approach are proposed considering the effect of imperfect preventive maintenance.First,based on the theory of Wiener process,the stochastic degradation process with the imperfect maintenance is modeled as multi-stage Wiener process.Second,starting with the inverse Gaussian distributed stage time,the lifetime distribution is derived by the convolution property of the inverse Gaussian distribution.Furthermore,the analytical solution of the RUL distribution can be calculated for the stochastic degradation device subject to imperfect preventive maintenance in future.Finally,for verifying the presented approach,a case study for gyros is provided,and the results indicate that the presented approach of this paper can improve the modeling fitting and the accuracy of the estimated RUL.关键词：degradation model;remaining useful life;imperfect maintenance;convolution;prognostic31|322|6更新时间：2025-07-16
- 摘要：A real-time self calibration approach for tri-axis magnetometers is proposed.The parameterized model of magnetometer readings is established by analyzing the nature of sensor errors,which lays a basis for the derivation of a nonlinear state-space model of calibration parameter using the invariability of local geomagnetic field.The real-time estimation of calibration parameter is derived based on extended Kalman filter(EKF) solution,the U-D decomposition filter is given for ease of implementation.Compared with the batch approaches,the proposed method not only can achieve real-time estimation of calibration parameters,but also is convenient for embedded implementation.Simulation results demonstrate the correctness of the derivation of the proposed approach.The effectiveness is validated by experimental test using RM3000 tri-aixs magnetometer.The results of simulations and experiments are analyzed and concluded in comparisons with TWO-STEP method.关键词：tri-axis magnetometer;real-time calibration;state-space model;extended Kalman filter;nonlinear filtering32|524|4更新时间：2025-07-16
- 摘要：The distance between adjacent circuits of high density printed circuit board (PCB) is reduced gradually.The particles of different components have different permittivity,which changes the electric field distribution that induces electrochemical migration (ECM) failure.In this paper,by the finite element method,the electric field distribution between the paralleled circuits with potential bias on PCB contaminated by dust is analyzed.The mechanism of the dielectric constant and the amount of charges of dust particles on the electric field distribution is studied.The effect of electric field distribution on dendrite growth path is predicted.Finally,by the electrochemical migration simulation experiments,the relation between the electric field distribution and dendrite growth path is verified.The time to failure of ECM caused by the change of electric field is also discussed.关键词：electrochemical migration;dust;finite element;electric field;printed circuit board23|279|2更新时间：2025-07-16
- 摘要：To solve the problem that the basic RRT algorithm for UAV path planning can only quickly get feasible path,unable to obtain near optimal path,an improved RRT algorithm is proposed.The algorithm takes into account the dynamic constraints of UAV,by introducing the path length constraint and improving the selection strategy for root node that nearest to the random sample point,the search tree will explore along the direction of the near optimal path.Flyable path is generated by using B-spline curves for path smoothing.Simulation results demonstrated that this proposed method can complete UAV path planning mission quickly and effectively.关键词：unmanned aerial vehicle(UAV);rapidly-exploring random tree;real-time;path length constraint;path smoothing197|542|21更新时间：2025-07-16
- 摘要：In this paper,framework of joint optimization algorithm based on EM (Expectation Maximization) is proposed for tracking a boost-phase ballistic target with unknown ballistic parameters.Firstly,the state and unknown parameters are estimated based on smoother in the E step.Then the mean and covariance of initial states,and the noise covariances are calculated in the M step.At last,URTS (Unscented Rauch-Tung-Striebel) based on EM is derived and the analytical forms of unknown statistics parameters are given,which makes the non-convex numerical optimization unnecessary.The result shows that the proposed algorithm is more accurate than iterative UKF (Unscented Kalman Filter) with the same order of magnitude of calculation.关键词：ballistic missile;boost-phase;EM;parameter identification;joint optimization26|316|5更新时间：2025-07-16
- 摘要：Resource leakage is one of the important defects of sandbox escape.The existing browser sandbox testing methods are insufficient to discovery leak resources.Based on most leaking resources have same or similar attribute values,this paper designed a resource-leakage oriented browser testing method.The method firstly analyzes resources attributes and create resource selecting rules,secondly,Calculates the escape index of every resource of system and use threshold to select testing resources; thirdly,Design and Implement a prototype system-Browser Sandbox Testing System(BSTS) and analysis the capability of our method,then we select and test some browser sandboxes,in the end,We found an undisclosed resource leakage vulnerability.关键词：browser sandbox;resource leakage;rough set theory;semantic match88|328|0更新时间：2025-07-16
- 摘要：The RF predistortion is an effective method to improve the linearity of High Power Amplifier (HPA).To obtain a better linearity of the HPA,accurate amplitude and phase compensation are required.A novel RF predistortion circuit is proposed for the linearization of a Ka-band Travelling Wave Tube Amplifier (TWTA),which consisted of a prepositive Variable Gain Amplifier (VGA),a post VGA and a nonlinear signal generating module based on vector synthesis technique.When changing the gain of the two VGAs can realize the adjustment of the compensation range.Reasonably changing the bias voltages of the two branches in nonlinear generating module can adjust the compensation amount and also can independently regulate the amplitude or phase characteristic.The Third Order Intermodulation (TOI) of a Ka-band TWTA is improved 11.5 dB at 6dB output power back-off owing to the proposed RF predistortion linearizer.关键词：travelling wave tube amplifier;RF predistortion linearization;nonlinear distortion;vector synthesis technique232|446|3更新时间：2025-07-16
- 摘要：The acquisition ambiguity problem of binary offset carrier (BOC) modulated signals resulted from the multiple correlation peaks of BOC modulated signals when employing correlation techniques used for conventional binary phase shift keying (BPSK) receivers.This paper systematically analyses circumvention mentality of acquisition ambiguity as well as the derivative acquisition method,and then put forward a new acquisition method based on tow-dimensional time delay evaluation.Compared with existing mainstream acquisition methods,the new acquisition method is comprehensive optimum in many aspects,including modulation parameter susceptibility,signal-to-noise ratio (SNR) loss,search step,estimated accuracy,hardware resource requirement and realization architecture.关键词：binary offset carrier (BOC) modulation;subcarrier modulation;acquisition ambiguity;time delay estimate31|275|1更新时间：2025-07-16
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