最新刊期
卷 45 ， 期 5 ， 2017
- 摘要：In this paper,a high speed reconfigurable control bits generation algorithm for rotation shift operations is proposed.The algorithm utilizes self-reconfigurable characteristics of the Inverse Butterfly/Butterfly network,and it is highly parallelized and low-cost.Moreover,it also integrates more than 10 kinds of rotation shift operations together,including rotation shift,bidirectional rotation shift,and sub-word rotation shift based on a bit width of 2i(i=1,2,…).Following this,a new high-speed reconfigurable rotation-permutation unit(HRRU)is developed and synthesized in SMIC 65-nm process.The results show that the proposed unit only containing rotation shift operations,enhances the frequency by 6.4%~12% and reduces the area by 22%~30%,compared with previously proposed solutions.When achieving a variety of rotation shift operations,the frequency of our unit decreases by 8.4%.But it can support twice operations as many as previous designs.关键词：Inverse Butterfly/Butterfly Network;rotation algorithm;reconfigurable;sub-word rotation operations330|555|2更新时间：2025-07-16
- 摘要：Video summarization has received widely attention as a technique to quickly display the main video content.Existing graph model based method takes video frames as vertices and uses the edges to build the relationship between two vertices,which may not well capture the complex relationship among the video frames.To overcome this drawback,we present a novel method based on hyper-graph ranking to generate a static video summarization,and name it Hyper-Graph Ranking based Video Summarization (HGRVS).Specifically,HGRVS first builds a video hyper-graph model to connect the video frames that have internal relations with hyper-edges;then classifies the video frames with an idea borrowed from the hyper-graph ranking method to provide the candidate keyframes;the video summarization is finally determined with the keyframes chosen by an objective function.Extensive subjective and objective experiments on the popular Open Video Project and YouTube datasets clearly demonstrate the superiority of HGRVS to the state-of-the-art approaches.关键词：video summarization;hyper-graph;hyper-graph ranking;video frames classification;keyframe extraction142|480|3更新时间：2025-07-16
- 摘要：In order to solve time-delay prediction problem of networked control system,a time-delay prediction method based on phase space reconstruction and least squares support vector machine is proposed in this paper.Firstly,0-1 test algorithm for chaos is used to determine the chaotic characteristics of the time-delay sequence,and the phase space reconstruction technique is introduced to improve the prediction accuracy.The Hurst exponent of the real time-delay sequence is analyzed,and least squares support vector machine is selected as the prediction model.Then,C-C method is used to determine the parameters of phase space reconstruction.The partial predictability of time-delay is determined by recurrence plot.The parameters of least squares support vector machine are off-line optimized by genetic algorithm.Finally,the time-delay sequence is predicted by the optimized least squares support vector machine combined with the phase space reconstruction.Compared with other prediction methods,the simulation results show that the proposed method has higher prediction accuracy and smaller prediction error,and does not reduce the real-time performance of the algorithm.关键词：networked control system;phase space reconstruction;least squares support vector machine;time-delay prediction155|383|4更新时间：2025-07-16
- 摘要：Program comprehension aims to obtain enough information in the software system to promote the comprehension of the target software.This paper proposes a novel technique,which uses relational topic model (RTM) to model code (class-level) documents in the software system into a program network.Then,the program network is visualized to help developers understand the whole software.The advantage of RTM is that it takes into account both the structural and textual information in the software system,which enables developers to fully understand the syntax dependence and semantic functional relationship in the program.The empirical results show that the program network is more accurate to model the relation among different classes,moreover,it is able to recommend relevant classes for a given class to understand a local part in the program.关键词：program comprehension;relational topic model;program network123|285|3更新时间：2025-07-16
- 摘要：With the AOTF-NIR spectral imaging technology is widely used in the deep space exploration,ultrasonic transducer as AOTF-NIR core components for it's operating bandwidth,spectrum diffraction efficiency and power efficiency,put forward higher requirements.It has different input impedances at different frequencies.When the drive signal source output impedance and ultrasound transducer input impedance mismatch will produce energy losses.Resulting in unable to the maximum power delivered to the transducer,so that the AOTF-NIR spectroscopy diffraction efficiency is reduced,affecting spectral sensitivity.The article by ADS simulation and experimental testing,applied on filter network theory and used LC lossless energy storage element and designed one kind of bandpass broadband matching network.Finally,impedance matching network return loss S11> -29.8dB within the 60-120MHz bandwidth,impedance matching network power efficiency is more than 90%.By constantly fine-tuning and optimizing matching the impedance values and LC parameter is to improve the spectral diffraction efficiency and spectral diffraction efficiency is more than 90%.Improved spectral sensitivity and spectral imaging clarity within the 620-1150nm band.关键词：power ultrasonic transducer;frequency characteristic impedance;broadband impedance matching network;global optimization224|394|2更新时间：2025-07-16
- 摘要：In order to further improve the performance of methods for audio events clustering,this paper proposes a method for audio events clustering based on the theory of agglomerative information bottleneck.First,the principles and derivations of information bottleneck are briefly introduced.Then,the proposed method is described in detail,including the definitions of source variables,relevance variables and destination variables,the steps of the proposed method and the analyses of main computational loads of all methods.The proposed method and two kinds of previous methods (including the method based on spectral clustering,and the method based on both Bayesian information criterion and agglomerative hierarchical clustering) are evaluated on the experimental data extracted from two different corpora of audio events.The experimental results show that the proposed method obtains higher K values (geometric mean of average clustering purity and average audio purity) and runs faster than the previous methods under several experimental conditions.关键词：agglomerative information bottleneck;audio events clustering;audio content analysis319|375|3更新时间：2025-07-16
- 摘要：A topography and volume measurement method is proposed to deal with the drawbacks of existing methods that they cannot simultaneously finish measuring the global and local morphologies of large-scale sample surface and volume calculation in a three-dimensional (3D) and high-resolution way.The large-scale scanning ion conductance microscopy (L-SICM) system was firstly built and the data stitching technique was used to extend the lateral measurement range of the existing SICM system,thus the large-scale,3D and high-resolution measurement result of the sample morphology can be obtained.Finally,digital image processing techniques such as subtracting background were utilized to accurately calculate the volume of the target object.Experimental results on sub-mm level sample indicate that the L-SICM based measurement method can effectively measure the global and local morphologies of large-scale sample in a 3D and high-resolution way and accomplish calculating the target volume and avoiding the nonlinear errors introduced by the optical measurement methods.Moreover,using smaller lateral scanning step (125 nm) can decrease the volumetric measurement error by 5.82% and the standard deviation of volume measurement by 38.12%,therefore improving the accuracy and stability of the measurement system.关键词：topography and volume measurement;scanning ion conductance microscopy;large-scale;data stitching101|325|0更新时间：2025-07-16
- 摘要：Inductor-Disconnected-Discharged (IDD) arc resistance model established is foundation of the evaluation of the non-explosive intrinsically safe performance for inductive circuit.The IDD characteristics were studied through test,based on the IEC safety spark test apparatus.The change laws of the discharge resistance with duration were deeply analyzed.By using non-linear regression method,the function relationship was obtained between the IDD time,inductance and initial current.Considering the tungsten and cadmium electrode structures of the IEC spark-test apparatus,a physical model of the inter-electrode arc discharge was established,and the boundary conditions of two-dimension Poisson's equation were inferred.Based on this,the algorithm of variable separation was applied to solve the Poisson's equation.Then,the mathematical expression of arc resistance was deduced.The relational expression between the arc discharge voltage and current of the IDD discharge were obtained for the low voltage circuits.The simulation and experiment results show that the theoretical analysis and proposed model are valid and feasible.关键词：inductor-disconnected-discharged (IDD);electrode structure;arc resistance;minimum arcing voltage;poisson equation128|337|5更新时间：2025-07-16
- 摘要：It is difficult to predict the life of highly-reliable products when the failure data are rare and the testing is costly.As such,based on the degradation data and failure data in the developing or accelerate testing stages,a life prediction method is proposed by integrating nonlinear accelerate degradation model and hazard rate model.The degradation process is first modeled as a nonlinear degradation process and the parameter estimation is achieved by analyzing the degradation process.Then an accelerate model is adopted and its parameters are estimated based on the accelerated degradation data to build the relationship between the parameters of the degradation model and stress levels.Further,the Cox proportional hazard model is adopted to fuse the failure data and censored data.To do so,the reliability function can be computed and the life of the product can be predicted accordingly.Finally,the usefulness and practical value of the presented method is demonstrated through the case application.关键词：life prediction;nonlinear model;accelerate degradation;hazard rate111|323|5更新时间：2025-07-16
- 摘要：By researching the Carbon Nanotube Field Effect Transistor(CNFET) and the Physical Unclonable Functions(PUF) circuit,a structure of high-performance ternary SRAM-PUF circuit is proposed.In this circuit structure,the cross-coupling ternary inverters generate random current,which is analyzed according to the mismatch feature.After competing the random current of ternary SRAM,it produces three-valued signal,such as "0","1" and "2".Under Stanford University 32nm CNFET standard model,HSPICE is used for Monte Carlo simulation to analysis the randomness,uniqueness and other features.And simulation results show that the randomness variation and uniqueness can be achieved at 0.03% after normalization.Comparing with conventional binary CMOS PUF circuit,the proposed circuit improves the speed by 33%,and increases the number of challenge-response by(1.5)n times.关键词：carbon nanotube field effect transistor(CNFET);three-valued logic;SRAM-PUF;randomness;uniqueness139|331|0更新时间：2025-07-16
- 摘要：Localization and reconstruction of the human motion trajectory based on high density and low cost PIR sensor is an important direction for the behavior analysis of people.The walking of persons can be detected through the 0-1 response of the PIR sensors.The identification and tracking of the behavior of the crowd can be achieved through the different sensor response sequence of spatio-temporal sequence relationship.Most of the existing analysis methods for PIR sensor network have revealed the statistical characteristics of crowd movement from the perspective of group behavior,but there still exists many problems in the estimation accuracy and uncertainty of behavior.Arming at the reconstruction of personal behavior trajectory in PIR sensor network,the geometric algebra is introduced to achieve the united expression of topological network of PIR sensor,spatial and temporal response of data sequence and the behavior of the person,thus judging the network connectivity according to the response of spatial and temporal relations of the sensors.Based on the geometric algebra operators,the extension and expansion rules of the trajectory are constructed,and behavioral trajectory reconstruction algorithm is constructed with the PIR sensor network response sequence data.Finally,the rationality and effectiveness of the method are demonstrated by using the continuous observation data of MERL laboratory.关键词：behavior trajectory;sensor network;geometric algebra;network analysis100|278|1更新时间：2025-07-16
- 摘要：With the development of Internet technology,novel types of protocol emerges one by one,which requires basic functional support from dataplane equipment.By now,SDN (Software Defined Networking) still has difficulty achieving both programmable protocol parsing and high forwarding performance.This paper proposes a Configurable dataplane based on LInkage between Parsing and Executing (CLIPE).By installing a user-configurable module in parser,CLIPE can achieve real-time update of multi-way tree in protocol parsing,thus making parsing protocol a user-configurable process.Besides,with the linkage between parser and action executer,the redundancy of overall architecture is reduced,as a result of which action delay and resource utilization are improved.Based on NetFPGA-10G board,the prototype of this architecture is implemented,and compared to other schemes such as EPC and POF,the advantage of resource utilization and forwarding rate is proved.关键词：network dataplane;flexible parser;action processor;programmable317|879|2更新时间：2025-07-16
- 摘要：Secure multiparty computation of set membership is significant to privacy-preserving data mining,data query,etc.In this paper,we first transform the original problem into the one-time evaluation problem for polynomial,and then construct four protocols.We design the trivial protocol 1 using homomorphic encryption and construct the efficient protocol 2 using discrete logarithm instead of encryption,which is very concise.Lastly,according to the different application scenarios,we also propose protocol 3 and protocol 4:the former can be used to outsource computation in cloud computing environment;the latter can be used for public secure computation against repudiation.The analysis and comparison show that our protocols are more efficient and concise than previously known.关键词：set membership;secure multi-party computation;homomorphic encryption;discrete logarithm;cloud computing;against repudiation254|662|4更新时间：2025-07-16
- 摘要：The millionaires' problem is an important problem in secure multiparty computation and a basic building block of secure multiparty computation protocols.Secure vector dominance statistic problem is a problem generalized for the millionaires' problem,which can be used to get the number of yi>xi without leaking further information.In this paper,we first propose an encoding scheme to encode private numbers; then based the new encoding scheme and homomorphic encryption scheme,we design a protocol for millionaires' problem and prove that the protocol is secure in the semi-honest model using the simulation paradigm.Then,we utilize this scheme to propose a solution to secure vector dominance statistic problem.The performance analysis indicates that our protocol is simpler and more efficient than the others.Finally,we use the scheme to solve the integer division problem and privately determine the relation between point and lines.关键词：secure multi-party computation;millionaires' problem;homomorphic encryption;vector dominance statistic problem95|779|6更新时间：2025-07-16
- 摘要：To achieve the objective of minimizing the system transmit power consumption at required end-to-end rates,we propose the optimal energy-efficient relay selection and power allocation method for energy harvesting two-way relay network based on the power splitting-based relaying protocol when the system has perfect CSI and imperfect CSI,the optimal power allocation of two sources and optimal energy harvesting proportion at relays are formulated.Simulation results show that channel estimation error would increase the total transmit power consumption,and energy harvesting two-way relay network could achieve less power consumption compared to conventional two-way relay network.关键词：two-way relay network;relay selection;power allocation;energy harvesting;channel estimation error277|804|4更新时间：2025-07-16
- 摘要：Compared to the conventional two-step localization method,the direct position determination (DPD) methods presented by Weiss and Amar have more advantages,such as high precision,strong resolution capability,no measurements-sources association issue,etc.Based on the idea behind the novel localization mechanism,a new DPD method using the passive measurements made with a moving antenna array is proposed in this paper.Unlike the previous approaches,the proposed DPD method considers the effects of array mutual coupling and can decouple the target's positions and mutual coupling coefficients so that they can be solved separately.In addition,the theoretical estimation variance of the new DPD algorithm is derived in analytical manner based on the matrix eigen-perturbation theory.Finally,simulation results demonstrate the superiority of the proposed algorithm and the effectiveness of the theoretical analysis in this paper.173|343|7更新时间：2025-07-16
- 摘要：Matrix embedding (ME) encodes cover objects and secret messages with an error correction code and modifies the cover data according to the coding result.The modification vector is the coset leader of error correction codes and the messages are conveyed by the syndrome.How to find the coset leader with lower computational complexity is the core of ME design.To improve the embedding efficiency and embedding speed of small payloads ME,this paper discusses the feasibility of introducing Hamming codes into the parity check matrix (PCM) of random linear codes,and proposes a new PCM structure.On this basis,an optimization scheme is proposed which can adaptively generate a PCM to accommodate to the given cover length and provide the best performance while guaranteeing the desired computational complexity.Experimental results show that this new method achieves higher embedding efficiency and faster embedding speed than previous fast ME methods,and is more suitable for real-time steganogaphic systems.关键词：steganography;matrix embedding;embedding efficiency;embedding speed265|377|1更新时间：2025-07-16
- 摘要：The problem of Temporal Constraints based QoS-aware web Service Composition (TC_QSC) is becoming increasingly critical in recent years.Its objective is to select the Web service composition which maximizes the QoS utility while preserving QoS constraints and temporal constraints.This paper proposes a temporal constraints decomposition method that formulates the TC_QSC problem into a general QoS-aware Web service composition (QSC) problem by means of decomposing the temporal constraints imposed on the whole or part of the workflow to a set of local temporal constraints for each activity.So the problem scale is reduced by filtering out those candidate web services violating local temporal constraints.The temporal constraints decomposition process is mainly dependent on the workflow and activities involved in it,while it has little to do with the candidate services.Therefore,its complexity is lower.The experiments have demonstrated the effectiveness and time cost of the proposed method and verify its necessity to local selection algorithm.关键词：temporal constraint;constraint decomposition;QoS-aware;Web service composition;greedy algorithm2|2|1更新时间：2025-07-16
- 摘要：A fuzzy system describes hunman language information by fuzzy rules,it is an important tool to deal with the uncertain information.Mamdani fuzzy system and Takagi-Sugeno (T-S) fuzzy system are two kinds of common systems.Firstly,the two types of systems are unified by introducing a control parameter so as to establish a generalized hybrid fuzzy system in this paper.Secondly,the hybrid fuzzy system can approximate to a continuous differentiable function with respect to infinite norm through Taylor formula with Peano remainder term of multivariate function,and certify that this system also has the second order approximation accuracy by means of Hessian matrix in Lagrange remainder term.Finally,the results show that the approximation effect of the hybrid fuzzy system based on the modeling of control parameters is better than the separate Mamdani or T-S fuzzy system by choosing sample points analysis.关键词：Mamdani fuzzy system;T-S fuzzy system;hybrid fuzzy system;control parameter;continuously differentiable function;approximation2|2|0更新时间：2025-07-16
- 摘要：The technique of histogram equalization (HE) is widely used in the field of image enhancement,the method is introduced into the gradient field in this paper,so image details are distributed in each gray level uniformly.Moreover,the characteristics of the histogram of gradient magnitude are studied,according to the right-skewed distribution of gradient magnitude,the gradient field is equalized by two intervals.In terms of the threshold's selection,numerical characteristics of frequency distribution are considered,two standards of the interval threshold are proposed,which can divide the gradient magnitude into the interval with low magnitude and the interval with high magnitude.On the process of the reconstruction of target gradient field,matrix transform method is proposed,which substitutes the traditional method "difference and iteration method",the proposed method can decrease the algorithm's time complexity.The experimental results show that the method this paper proposed can make image details enhance effectively.关键词：image enhancement;gradient field;histogram equalization;bi-interval;the histogram of gradient magnitude;skewness2|2|10更新时间：2025-07-16
- 摘要：Model-based diagnosis is an important problem in the field of artificial intelligence.In model-based diagnosis,how to get the minimal conflict sets is a well-known problem with extensive applications.In this paper,according to the characteristics of the conflict sets,we use the enumeration tree to reconstruct the process of solving conflict sets and then design a reverse depth algorithm based on the previous algorithm CSISE-Tree.Firstly,this proposed reverse depth search algorithm can reduce as many memory spaces as possible when obtaining some conflict sets,while CSISE-Tree have to expend some unnecessary memory spaces in this case,where the consume of memory spaces exponentially grows with the number of circuit elements.Secondly,compared with CSISE-Tree,our algorithm can effectively cut down the number of calling the SAT(Boolean SATisfiability problem) solver by pruning some non-minimal conflict sets and non-conflict sets.The experimental results show that our algorithm performs better than its competitor CSISE-Tree in terms of run time in most instances.More importantly,our algorithm avoids the memory explosion when solving some large instances.关键词：model-based diagnosis;conflict set;Boolean SATisfiability problem (SAT);set-enumeration tree(SE-Tree)2|2|3更新时间：2025-07-16
- 摘要：A hotspot control and content dispatch caching algorithm is proposed to improve the homogeneous caching caused load imbalance and low storage utilization.When the content request arrives,the overloaded nodes are selected synthetically by betweenness and access degree.The content is dispatched to idle neighbors with popularity for caching decisions,combined with a lifetime control mechanism.So that the request balancing and the hotspot relieving are achieved.Simulation results show that,with the decrease of the request latency and hop counts,our proposed algorithm can effectively improve the load imbalance and increase the hit rate as well.关键词：content-centric networking;collaborative caching;load balancing;content dispatch2|2|2更新时间：2025-07-16
- 摘要：By building two models including Deep Convolutional Neural Networks and Deep Sparse Rectifier Neural Networks on facial expression dataset,we made contrastive evaluations in facial expression recognition system with deep neural networks.Based on prior structure knowledge of facial expression,we proposed a fast and simple improved method called K Region Of Interest——‘K-ROI’,which relieved the poor generalization of deep neural networks on experimental dataset due to insufficient data and decreased the testing error rate apparently and generally.Finally,we infer the experimental results and analyze comprehensively for the possible validity with deep neural networks on arbitrary image dataset.关键词：K-ROI;deep neural networks;deep learning;facial expression recognition3|3|9更新时间：2025-07-16
- 摘要：To solve the maneuvering target tracking problem,firstly,the essential condition of adaptive adjusting model based on adaptive Markov parameter IFIMM algorithm is deduced.Then the limitation of adaptive Markov parameter IMM algorithm is further analyzed.Through redefining the error compression ratio between models,an improved adaptive Markov parameter IMM algorithm is proposed,and the character of the error compression ratio is elaborated.Finally,application scope of improved adaptive Markov parameter IMM algorithm is delimited by simulation experiments.关键词：target tracking;interacting multiple model(IMM);Markov matrix;posterior information2|3|20更新时间：2025-07-16
- 摘要：The prediction theory and algorithm of Loran-C signals propagation characteristics under water are studied.The path loss,phase delay,dispersion effect,as well as boundary condition are all taken into account as the pulse signals propagation along the earth surface and then into the water.The amplitude and phase of the Loran-C signals in different depths (0~10m) of water are discussed.The predicted results by the proposed algorithm are compared to the standard ones with no waveform distortion.It is shown that due to dispersion effect,the envelope of the waveform would broaden and the phase of the tracking point would advance as the depth of water increases.Because the error introduced by the reference fields' approximation is deleted,the result should be more accurate.关键词：Loran-C;underwater receiving;dispersion effects2|2|0更新时间：2025-07-16
- 摘要：To obtain 3D non-rigid projective reconstruction from an image sequence,an iteration projection reconstruction method for 3D non-rigid based on minimal eigenvalue is presented.Based on the characteristic that all the image points and the depth factors constitute a low rank image matrix,the method replaces projection solution by eigenvalue and eigenvector solution.Then we can obtain the depth factors by iteration.Finally,the 3D non-rigid projective reconstruction is realized.The method can guarantee to converge to the global optimal solution.The experiments with both simulate and real data show that the proposed method has the advantages of fast convergence speed and small error.关键词：non-rigid;projective reconstruction;eigenvalue2|2|1更新时间：2025-07-16
- 摘要：Almost the existing image enhancement algorithms are not capable to deal with multi-type degenerated images.In this paper,a fast image enhancement algorithm is proposed based on prior knowledge and atmospheric scattering model.Firstly,an innovative image prior,which were called bright channel prior,were proposed through experimental statistics.It shows that the whites spots are more likely to exist in the neighborhood of each pixels in high-quality clear image.Then,the scattering model were improved and it derived the calculation formula of reflectance image by bright channel prior,dark channel prior and improved scattering model.Finally,we put forward a fault tolerance mechanism,which is based on reliability prediction,to handle the situation that the dark channel prior does not work.The experiment results shows that this algorithm can not only highlight the texture details well but also restore the tone.It is able to deal with multi-type degenerated images.关键词：image enhancement;bright channel prior;dark channel prior;atmospheric scattering model2|2|3更新时间：2025-07-16
- 摘要：It has been proven that structure of image play an important role in kernel estimation.In recent years,many successful algorithms propose to generate intermediate image by extracting structure from latent image,and then use it for blur kernel estimation.However,these methods ignore to extract the correspondence from input blurry image.This will cause unbalanced data item of objective function.In this paper we first exploit a mask determined by convolution of intermediate image with kernel to generate the correspondence,and then take it into data item instead of blurry image to overcome the problem.Moreover,we have found that kernel shows the properties of sparse both in intensity domain and derivatives domain.Accordingly,we apply L0-norm regularization to constrain both intensity domain and derivatives domain of kernel.Compared with the state-of-the-art algorithms,experiments across datasets showed that our algorithm achieved better performance.关键词：deblurring;deconvolution;blur kernel;image recovery2|4|4更新时间：2025-07-16
- 摘要：This paper proposed a new anonymous communication model with multi-path (ACM-MP) based on information slicing theory and network coding technology.In ACM-MP,the messages are transmitted through different anonymous links after being sliced by information slicing technology.Each node of the transmitted network can obtain address information of its immediate successor node location by coding operation,which can ensure that the receiver receives all the coded information about the message.The results of analysis and simulation suggest that the proposed model has better security,anonymity and better ability to resist conspiracy attack.关键词：anonymous communication;network coding;information slicing;multi-path transmission;conspiracy attack4|2|1更新时间：2025-07-16
- 摘要：Traditional security computing provides fixed security service capability,making it impossible to reconfigure the security system based on changes in the network environment and security needs.Therefore,its adaptive capacity is poor and its security management becomes complicated.Besides,the ratio of hardware reuse is low.Reconfigurable security computing provides a new method to improve the flexibility,adaptability and extensibility of the system.This paper describes the development of reconfigurable security computing,preliminarily studies on its connotation and significance,puts forward its concept model and discusses the key technology and its research status in detail.What's more,the development trend of reconfigurable secure computing is analyzed.Reconfigurable information security system integrates the new computing and information security technique.It is the inevitable development trend and will provide a broader application for information security technology.关键词：reconfigurable information security system;reconfigurable security computing;flexibility;adaptability2|2|1更新时间：2025-07-16
- 摘要：Because the high frequency band has a very large spectral bandwidth,it is a promising candidate band for the next generation (5G) mobile communication systems.High frequency band also has strong propagation loss,quasi-optical characteristics and other characteristics.In order to fully utilize,select and evaluate the available high frequency band,it is necessary to adequately measure and research on the high frequency channel.Currently there are mainly two kinds of sounders,customized broadband and vector network analyzer based,are used for high frequency channel measurement.The paper reviews the high frequency channel measurement campaigns currently undertaken,including the antenna configuration,scenarios,focused parameters and the corresponding measurement equipments.Finally,several high frequency band channel models newly proposed,e.g.METIS,MiWEBA,mmMAGIC,5GCM and 3GPP-HF,are summarized and pointing out the key features and application scope of the existing model,as well as the direction on channel measurement and modeling to be strengthened.关键词：5G mobile communication;high frequency band;channel measurement;channel modeling4|2|8更新时间：2025-07-16
- 摘要：Traffic balancing is proposed as a routing optimal goal in traffic engineering in order to avoid the network congestion.Because of data center traffic characteristics,traffic engineering of traditional IP networks may be not suitable to the data centers.Thus,we present a dynamic routing algorithm:DralCD (Dynamic Routing Algorithm based on Link Critical Degree),which is based on the link critical degree within SDN (Software Defined Network) framework.By the global visibility and making full use of the redundant paths in the network,DraLCD can realize the fine-grained traffic balancing while reducing the computing cost of controller and communication overhead between controller and switches,and finally achieves the goal of routing optimal.Furthermore,we design and perform the prototype of DraLCD on Mininet platform,and compare it with two other popular algorithms:ECMP (Equal-Cost Multi-Path) and GFF (Global First Fit).In our evaluations,the results show that DraLCD can significantly improve the network performance compared with the other two algorithms.关键词：traffic balancing;software defined network (SDN);critical link;multipath routing2|2|4更新时间：2025-07-16
- 摘要：In recent years,the online bipartite graph matching problem has attracted substantial research attention as many real-life problems can be eventually reduced to it.In this work,we study the classic online matching problem that was initially investigated by Karp in 1990.We adopt the Beta distribution as the prior distribution of the adjacency relation among the nodes,and present a novel measure to evaluate the matching policy.We also design BetaOM,a Beta distribution based online matching algorithm,and mathematically prove its soundness.Experiments with BetaOM as well as the benchmark algorithms on both synthetic and real data demonstrate that the proposed BetaOM is superior to the others.关键词：bipartite graph;online matching;beta distribution;stochastic optimization2|2|0更新时间：2025-07-16
- 摘要：The excitation frequency of radical solution in Overhauser magnetometer probe directly determines the quality of larmor precession signal,which is generated by the probe.In order to obtain the excitation frequency accurately,a test apparatus for measuring the excitation frequency of Overhauser magnetometer probe was designed.In view of the existing problems of present test apparatuses,such as lower resolution,complex operation and so on.This paper adopts a high-resolution DDS as the controllable RF signal source; using the ADC synchronization acquisition technology,combined with the data processing method of normalization,and the uneven problem of the amplitude-frequency characteristic curve in the range of 50MHz~100MHz has been solved effectively; moreover,by adopting the RF power amplifier,weak signal amplification as an auxiliary measurement channel,the apparatus's integration of standard measurement and aided measurement has been achieved.The equivalent circuit of the probe's resonant cavity is simulated,and the effect degree of the adjustable capacitor to the resonant frequency and quality factor of the Overhauser magnetometer probe is obtained.The simulated results are further verified by testing the curve of cavity resonance of the commercial probe under different parameters' conditions.Meanwhile,the relationship between the polarization degree of the radical solution and RF excitation power & time are also obtained.The test method and results are given and the experimental data are analyzed.Finally,the experiment results demonstrate that the excitation frequency of the radical solution,excitation frequency bandwidth and quality factor can be found accurately by using this apparatus.And the apparatus can be also used for the determination of excitation power and excitation time in the process of magnetometer design,which lay the foundation for the design of Overhauser magnetometer in the future.关键词：Overhauser magnetometer;dynamic nuclear polarization;radical solution;Larmor procession3|2|0更新时间：2025-07-16
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0