最新刊期
卷 37 ， 期 5 ， 2009
- 摘要：The conventional adaptive fuzzy logic controllers are usually too complex for analog circuit implementation.To solve this problem,an on-line adaptive fuzzy logic controller and its application in the control of nonlinear system are studied,whose universe can adaptively change along with the changing of the input variables.Its CMOS analog chip is designed and fabricated.A novel peaky-triangle membership function is proposed to realize the input variable universe part.For the output part of VFLC,the absolute value of the integral of the input variable is used.The other parts are current-mode minimization circuit and a COG (center of gravity) defuzzification circuit.All the above circuits and a whole system were implemented under 0.6μm CMOS standard technology.Their test results show that they fulfill the function of the variable-universe fuzzy logic controller.关键词：CMOS analog circuit;fuzzy logic controller;adaptive control;membership function circuit2|1837|2更新时间：2025-07-16
- 摘要：In secure group communication,group key management is the most critical issue.Firstly,we analyze the state and the problem of existing group key management schemes,and then present a secure,efficient and contributory group key management scheme based on elliptic curve cryptosystems.The security,correctness and completeness of our scheme are discussed in this paper.The security of our scheme relies on the elliptic curve discrete logarithm problem(ECDLP).For the sake of the forward secrecy and backward secrecy of group key,new scheme supports group members to renew their group key when the external nodes join the group or the internal members leave the group.Compared with the known approaches,new scheme attaches more importance to impartiality,the group structure is unfixed,all participants only need two-rounds to generate the group key,the low memory cost is also the virtue of our scheme.The new scheme is suitable for application in Ad hoc network environment.关键词：group key agreement;elliptic curves;discrete logarithm problems;forward secrecy;backward secrecy2|1597|3更新时间：2025-07-16
- 摘要：A novel clustering algorithm for high dimensional data is proposed in this paper.This algorithm first partitions input document set into some clusters by constructing feature chains.Simultaneously it also considers the effects of similar features in similarity computation and weight adjustment to agglomerate documents with semantic similarities,and dynamically adjusts weights of documents to make unbalanced documents well trained.Experiment results demonstrate that it can obtain relatively better clustering results with high intra-cluster agglomeration and inter-cluster distinctness,and also has less iterative times.关键词：semantic similarity computation;self organizing mapping;feature chain;weight adjustment2|1600|3更新时间：2025-07-16
- 摘要：An Along Track Interferometry (ATI) method based on sub-aperture image series for triple-channel Ultra-Wide Band Synthetic Aperture Radar (UWB SAR) system is proposed.By exploiting the large beamwidth characteristic of UWB SAR,the method generates a series of sub-aperture ATI images with different view-angles for moving target detection and parameter estimation.This method has two improvements over traditional ATI method.Firstly it detects the moving target with non-zero range velocity or non-zero azimuth velocity.Secondly both range velocity and azimuth velocity can be estimated via the method.The experiments based on UWB SAR half-real echo demonstrate the effectiveness of the method.关键词：ultra-wide band;synthetic aperture radar;along track interferometry;sub-aperture image;ground moving target detection2|905|2更新时间：2025-07-16
- 摘要：As an important signature of the radar target,the angular glint effects on radar system mainly arise at near field.However,the current prediction methods of angular glint are mostly based on the far field condition.This paper presents a prediction technique of near field angular glint based on the scatter-center model to solve this problem.Firstly,the near field backscattering is represented based on scatter-center model.Then by solving the derivative of the backscattering phase vs.the position vector of the observer,including incident angles and range,we get the exact expression of angular glint at near field.Finally,the exact expression is approximated and simplified in the range of terminal guidance.The conclusions of the paper show that the expression by HUANG Pei-kang in the book 'Radar Target Signatures’ is the approximation of ours at far field under certain polarization,and that the simplified expression has a well precision in the range of terminal guidance.All these results provide the theoretical basis for the prediction of near field angular glint and its signature research.关键词：electromagnetic wave scattering;angular glint;near field;phase gradient method2|1510|3更新时间：2025-07-16
- 摘要：The vector array MVDR beam forming algorithm only suitable for narrow-band signals can estimate the spatial spectrum effectively,and it was difficult to detect the weak target when targets energy differ in large scale.The empirical mode decomposition (EMD) can emphasize signals’ local characteristic and decompose multicomponent signals into many intrinsic mode functions (IMFs).Combining the IMF characteristic and the MVDR narrow-band signal request,this dissertation proposes the vector array mode domain MVDR beam forming algorithm,and considers the IMF’s center frequency as the center frequency.The sea trial results show this algorithm can enhance the weak signal’s spatial spectrum energy,and realize the weak target’s detection effectively in strong interference.关键词：empirical mode decomposition;mode domain MVDR beam forming (MMVDR);vector array;central frequency2|1154|7更新时间：2025-07-16
- 摘要：With the development of IC to deep sub-micron and nanometer technology,plasma damage by charging to the CMOS devices,especially to the ultra thin gate oxide becomes more and more prominent.The mechanisms of plasma damage and antenna effect are analyzed in this paper.Capacitors and devices with different antenna ratio,composed of poly,contact and metal,are designed,and embed with process.And the test structures are discussed and those results are obvious and sensitive,achieving the wafer level process monitor of plasma charging damage in ultra-thin gate oxide.The results show that the plasma damage changes with process.Once the antenna ratio is over 103,the plasma damage becomes easily to be found.Meantime it could be found which process step induced the charging damage is serious,what studied in this paper offers scientific references to increase the gate oxide ability against the plasma charging damage.关键词：gate oxide;plasma charging damage;antenna structure;process monitor2|1575|2更新时间：2025-07-16
- 摘要：The optimization on BER performance of UWB non-coherent receiver based on OOK scheme is investigated.The optimum parameters combination of length of integration interval and SNR in the integration interval,which makes the BER minimum,is obtained theoretically and practically.A modified least-squares-based algorithm is proposed in this study,which applies the Gaussian approximation to the exact optimal threshold.Meanwhile,the feasibility of the traditional approximation is explored.The results show that,compared with the conventional method,the optimum parameters proposed in the study increase the system performance greatly.关键词：Ultra Wideband;integration intervals;thresholds;gaussian approximation;least square2|1234|3更新时间：2025-07-16
- 摘要：The simulating model of Josephson junctions in PSpice is constructed and used in the investigation of Shapiro steps.In the condition of little capacitance,we have researched the influence of resistively and capacitively shunted Josephson junction's parameters,including critical current and normal resistance,on Shapiro steps.We found that it can improve the steps by both to reduce the normal resistance under a larger rf-current circumstance and to increase the normal resistance in the condition of a smaller rf-current.We also found that the larger the junction critical current,the higher the Shapiro steps,when the junction resistance keeps constant.The results are of important referential value for the voltage standard and THz signal detection by Josephson junctions.关键词：Josephson junction;shapiro step;voltage standard;THz signal detection2|1580|4更新时间：2025-07-16
- 摘要：In the dual logic detecting algorithm which based on miniterms,the exponential expansion of minterms makes the minterms based algorithm work slowly and exhausts the memory.To accelerate the detection speed for the large functions,we proposed a novel detecting algorithm which based on cubes.Furthermore a strategy of mixed using of cube based detection and minterm based detection is proposed to get a good result.The experimental results on NCMC benchmark prove our algorithm and strategy effectiveness.关键词：boolean logic;Reed-Muller logic;hamming distance;detection algorithm2|986|4更新时间：2025-07-16
- 摘要：A design of two wideband antennas sharing one aperture is proposed.One antenna consists of a rectangle impedance loaded monopole,an inverse "L" shape impedance loaded monopole and matching network,which coves 30-600MHz (VSWR ＜3)and possesses a band-rejection characteristic at 86-110MHz.The other antenna is an open form sleeve and covers 820-1200MHz with VSWR＜2.2.关键词：wideband antenna;complex antennas;planar antenna;impedance loaded antenna2|1336|0更新时间：2025-07-16
- 摘要：The vertical integrated diode can sense blue and red illumination simultaneously,it can provide full color information with green/magenta filter on it.It can also be the pixel of the CMOS image senor for its fully compatible with standard CMOS process.Its basic principle is to use the silicon’s differences of penetration depths of electromagnetic waves with different wavelengths,i.e.,blue light with short wavelength is absorbed mainly at surface while red light with longer wavelength is absorbed deeper.Through extraction of photogenerated carrier at different depth by vertical integrated diode with two color filters,we get the full color image.The numerical simulation and the experimental device show that it can provide color information and can be applied in CMOS image sensor pixel design.关键词：color imaging;color sensor;CMOS image sensor;vertically integrated diode2|1495|2更新时间：2025-07-16
- 摘要：This paper presents a new method for lexical paraphrasing.The method first constructs a paraphrase corpus by automatically translating a bilingual parallel corpus into a monolingual parallel corpus,from which candidate paraphrases for words are extracted.After that,a new statistical model is proposed for lexical paraphrasing,which selects the best paraphrase for a word in a given context sentence.Experimental results show that the automatically constructed paraphrase corpus is effective for lexical paraphrasing.In addition,the presented paraphrasing model significantly outperforms two conventional models,enhancing precision and recall by about 10%,respectively.关键词：lexical paraphrasing;paraphrase corpus;paraphrasing model2|1153|1更新时间：2025-07-16
- 摘要：As eyelid and eyelashes are likely to disturb iris texture,the extent cannot be predicted before acquiring iris image.Some fluky and unfixed features are caused by the yawp in feature templates,which make iris classification false rate increase.In order to resolve this problem,a iris recognition algorithm based on multiple region combination is proposed in this paper,iris image that is not liable to be disturbed relatively is separated into four subarea,then the four similarities of corresponding subarea are calculated in two image,features of the closest subarea are considered as the judgment that is used to carry out classification.It overcomes previous limitation brought by selecting only a fixed position to extract features.Results show that proposed means achieves quite high accuracy,it is efficient for boosting up adaptability to image quality and improving iris recognition performance on CASIA iris database.关键词：biometrics;iris recognition;feature extraction;matching5|1169|4更新时间：2025-07-16
- 摘要：Develope an approximate,recursive Gaussian filters for nonlinear dynamics with additive noise,square-root quadrature Kalman filter (SRQKF).This filter is the square-root implementation on the basis of the quadrature Kalman filter (QKF),it linearizes the nonlinear functions using statistical linear regression method through a set of Gaussian-Hermite quadrature points that parameterize the Gaussian density.The squre-root implementation of the new filter not only enhances the numerical stability,guarantees positive semi-definiteness of the state covariance,but also increases the filtering accuracy.The simulation shows that the tracking accuracy of the SRQKF is 12% higher than that of QKF,and the tracking accuracy of QKF is higher than that of the unscented Kalman filter (UF) and extended Kalman filter (EKF),but the computational cost of them are all higher than that of UF and EKF.The new filter is an effective nonlinear filtering algorithm in the place required high filtering accuracy.关键词：Gauss-Hermite quadrature point;statistical linear regression;unscented filter;quadrature Kalman filter2|2300|15更新时间：2025-07-16
- 摘要：Explaining the causes of infeasibility of Boolean formulae has practical applications in various fields.A smallest-cardinality unsatisfiable subformula can provide a succinct explanation of infeasibility,and help automatic tools to rapidly locate the errors,and determine the underlying reasons for the failure.We present the relationship between maximal satisfiability and minimum unsatisfiability.Based on the relationship,a compounded greedy genetic algorithm and an ant colony algorithm are proposed to derive a minimum unsatisfiable subformula.We report experimental results on practical benchmarks,as compared with the best known branch-and-bound algorithm.The results show that two algorithms strongly outperform the branch-and-bound algorithm,and the compounded greedy genetic algorithm outperforms the ant colony algorithm on both efficiency and size of unsatisfiable subformulae.关键词：formal verification;minimum unsatisfiable subformula;maximal satisfiable subformula;compounded greedy genetic algorithm;ant colony algorithm2|1062|5更新时间：2025-07-16
- 摘要：This paper focuses on key technique in avionics data bus AFDX protocol——Virtual Link Scheduling Algorithm.We give AVLSP,AFDX Virtual Link Static Priority scheduling algorithm,to improve the performance of AFDX networks.Network Calculus theory is used in modeling and analyzing AVLSP.A simulation platform is also constructed to test the algorithm.The final results confirm that,AVLSP algorithm can effectively reduce transmission delay of emergency data and satisfy needs for real-time data transmission in avionics data networks.关键词：avionics full duplex swiched ethernet (AFDX);network calculus;delay bound;jitter analysis2|1821|13更新时间：2025-07-16
- 摘要：The warpage issue of three-dimensional multi-chip module (3D-MCM) was discussed by using finite element (FE) simulation with viscoplastic solder model and large deformation theory.The comparison results show that the existence of the cavity in the embedded substrate results in the double-bow warpage mode of substrate,the viscoplasticity of solder balls results in the residual warpage of 3D-MCM during the temperature cycling.The cavity in the center of substrate can decrease the warpage of 3D-MCM.The application of underfill could strengthen the interconnection between device and substrate,and decrease the residual warpage of 3D-MCM after temperature cycling.However,the large CTE (coefficient of thermal expansion) of underfill might incur other new failure models.Finally experimental results by Moiré fringes pattern validated the predication of warpage by the simulation with viscoplastic solder model.关键词：3D-MCM;embedded substrate;warpage;FE simulation;thermo-mechanical reliability;Moiré fringes2|1686|0更新时间：2025-07-16
- 摘要：Flat shunting is a type of discrete event systems in the process of railway dispatching.It is very important that software of any flat shunting system have high reliability and high testability for ensuring transportation safety.For that goal,it is necessary to build a kind of regular design methods for software of flat shunting systems.In this paper,the complexity of event driving in the process of flat shunting and the limitation of description with natural language are analyzed.Therefore new descriptions of some processes in a flat shunting system with automaton models are proposed.In detail,the relationships between a flat shunting system and timed automata (TA),pushdown automata (PDA) and the structure of layered automata are discussed.On the basis of explaining the partition of states,the data structure and the flow of state transition,a design method of flat shunting systems based on automaton models is built.关键词：discrete event system;flat shunting;timed automaton;pushdown automaton2|922|0更新时间：2025-07-16
- 摘要：Short text classification is a key technology in network content security application.However,the sparse features and unbalanced data of the short text make the traditional text classification method incompetent for short text classification.This paper proposed a dynamic assembly classification method for short text classification.In this method,a treelike assembly classifier was constructed to support the classification,which reduced the impact of the sparse features and unbalanced data of the short texts.Further,a dynamic adjusting strategy was presented in the construction procedure,which adjusted the combinational structure of the classifier in an adaptive way.The experimental results show that,comparing with the traditional classifiers such as single classifier and ensemble classifier,the proposed assembly classifier gets better precision rate and recall rate.关键词：short text classification;assembly classifier;dynamic adjusting strategy;adaBoost.2|1757|13更新时间：2025-07-16
- 摘要：This paper analyzes the problem of TFRC (TCP-Friendly Rate Control) protocol in slow-start phase in which the sending rate increases exponentially like that in the TCP protocol,and proposes a method of using round trip time (RTT) to adjust the sending rate adaptively in this phase.The method can detect the network congestion degree by comparing the sample RTT with the average RTT and then adjust the aggressiveness of sending rate in slow-start phase.The simulation results indicate that with this method,TFRC reduces the packet loss rate before entering the congestion avoid phrase,and improves the throughput and smoothness property,thus meeting the requirements of multimedia stream more effectively.关键词：TCP-friendly rate control(TFRC);slow-start;congestion aware2|1335|3更新时间：2025-07-16
- 摘要：The formal proof of the security protocol becomes a hot and hard issue.Taking the Digital Media Distribution Protocol as an example,the Petri Net model is adopted which combined with the process algebra and the logical induction methods to formally prove the present security protocol and can avoid the state explosion problem.In this proof an equality principle is used to transform the security protocols to guarantee the simplicity of the proof.At the same time,the completeness of the proof is discussed and what we have done shows the validity of proving the security of protocol with a Petri Net model.关键词：Petri net;security protocol;digital media2|1181|2更新时间：2025-07-16
- 摘要：To make the negotiation agents gain satisfying result and negotiate more efficiently in multi-agent based e-commerce,a genetic algorithm based on metropolis rule is presented and the algorithm is applied in multi-lateral multi-issue simultaneous bidding negotiation.After 1000 times of experiments,simple genetic algorithm averagely needs 155 runs to gain the satisfying result,while the genetic algorithm based on metropolis rule averagely needs 76 runs to gain the satisfying result.The experimental result show the genetic algorithm based on metropolis rule can gain the optimal negotiate result more efficiently in multi-literal multi-issue negotiation.关键词：E-commerce;multi-literal multi-issue negotiation;genetic algorithm;metropolis rule2|1119|3更新时间：2025-07-16
- 摘要：Saving energy and prolonging network lifetime are key issues of wireless sensor networks.Based on shortest path tree,ratio weight (Ratio-W) and sum weight (Sum-W) routing algorithms are proposed,in which both remaining energy of nodes and energy consumption for delivering packets on wireless links are considered.Simulation exhibits the Ratio-W and the Sum-W can prolong network lifetime and make energy consumed efficiently and effectively.In addition,the proposed algorithms outperform some well-known routing algorithms in terms of network lifetime and energy consumption.关键词：wireless sensor network;routing;network lifetime;energy saving2|2160|19更新时间：2025-07-16
- 摘要：Laplacian pyramid(LP) is an effective tool to form a multi-resolution system and is widely used since its proposal such as the structure of contourlet transform,however the drawback of its implicit oversampling prevents it from being used for image compression and etc.In this paper,a non-redundant and multi-directional pyramid structure is proposed.We illustrate the source of the redundancy of the pyramid structure first,and then make a review about the maximal decimation theory and give the solution of solving the redundancy of LP.Then we suggest a pyramid based non-redundancy structure and combine this with the DFB to form a new system to achieve the multi-resolution and multi-directional features.The results of our experimental work show its superiority over contourlets and wavelets in the nonlinear approximation (NLA).关键词：non-redundant;Pyramid;contourlet;nonlinear approximation2|1146|1更新时间：2025-07-16
- 摘要：Based on minimum within-class scatter support vector machines (MCSVMs),a new matrix pattern based MCSVMs (MCSVMsmatrix) is presented.Accordingly,it is extended by introducing Mercer’s kernels in order to solve the problem of nonlinear decision boundaries,which presents a significant matrix pattern based nonlinear support vector machines:Ker- MCSVMsmatrix.The above-mentioned approaches not only keep the merits of MCSVMs,but,owing to introducing matrix pattern based within-class scatter matrix into support vector machines,theoretically better solve the singular problem of within-class scatter matrix when small sample size problems are dealt with,reduce the time/place complexity when within-class scatter matrix,its invertible matrix and coefficient vector omega are calculated.Hence,the classification accuracy is improved to certain extent.Experimental results indicate the above advantages of the proposed methods:both MCSVMsmatrix and Ker- MCSVMsmatrix.关键词：SVMs;matrix pattern;within-class scatter matrix;face recognition2|1432|6更新时间：2025-07-16
- 摘要：Question answering is one of the research hotspots in information retrieval and natural language understanding.This paper summarizes the up-to-date research advances in open-domain question answering,compares the different approaches in question analysis,document and passage retrieval,answer extraction according to different question types.The shortcomings of state-of-art techniques are also discussed,and further research directions for question answering are analyzed and prospected at last.关键词：open domain question answering;question analysis;relevant document retrieval;passage retrieval;answer extraction4|3667|9更新时间：2025-07-16
- 摘要：Sampling is the bridge between analog source signal and digital signal.With the rapid progress of information technologies,the demands for information are increasing dramatically.So the existing systems are very difficult to meet the challenges of high speed sampling,large volume data transmission and storage.How to acquire information in signal efficiently is an urgent problem in electronic information fields.In recent years,an emerging theory of signal acquirement——compressed sensing (CS) provides a golden opportunity for solving this problem.This paper reviews the theoretical framework and the key technical problems of compressed sensing and introduces the latest developments of signal sparse representation,design of measurement matrix and reconstruction algorithm.Then this paper also reviews several open problems in CS theory and discusses the existing difficult problems.In the end,the application fields of compressed sensing are introduced.关键词：information sampling;compressed sensing;sparse representation;measurement matrix239|14281|377更新时间：2025-07-16
- 摘要：An optimization methodology is proposed for designing ultra-wideband (UWB) low noise amplifier (LNA) in CMOS technology to achieve better performance of LNA in UWB RF front-end.Based on the circuit model of inductively source degenerated LNA,we present a design method using mathematics optimization technology to get optimum transistor size and component value in input matching net and load net,leading to fine input matching,adequate and flat gain ,excellent noise performance as well as low power consumption.Meanwhile,the passive components in the proposed circuit can be implemented easily in CMOS technology with tolerance of process variation.Simulation results show that UWB LNA using this design methodology can achieve expectable performance.关键词：low noise amplifier (LNA);ultra -wideband(UWB);optimization design methodology;CMOS2|1807|5更新时间：2025-07-16
- 摘要：Fragment-based caching technology can effectively improve the quality of dynamic web pages' services.Nowadays,many existing dynamic web pages systems have not been designed by this technology,so how to apply it to these systems is a big challenge.This paper presents an online approach to apply fragment-based caching technology to these existing systems.Our approach has three main advantages as follow.Firstly,the original system is evolved into a fragment-based system online without service interception.Secondly,the approach simplifies templates maintenance,decreases the logic computing granularity from page to fragment,and greatly reduced the pressure on the server side.Thirdly,the approach is independent of the original system,which effectively supports the change and upgrade of the system.Evaluation results show that this approach can fulfill the system evolution and greatly improve its service quality.关键词：dynamic web pages;fragment-based caching;online;flag2|936|3更新时间：2025-07-16
- 摘要：A dynamic traffic flow forecasting model based on neural network is proposed.BP and RBF neural network are used to build the forecasting models.The data pre-handle method and the judgment criterion of the forecasting model are given.Simulation shows the traffic flow forecasting method is effective,and the RBF can be more fast and effective in forecasting the traffic flow by simulation analysis.关键词：neural network;traffic flow;forecasting model4|3445|13更新时间：2025-07-16
- 摘要：Aiming at the localization problem of large scale WSNs,a multilevel localization model is presented.Firstly,the nodes are divided into different levels according to their characters,and then localization algorithms are designed for each level and combined to the whole localization model of WSNs.The errors of each level and the error propagation between the levels have been analyzed,and the methods of reducing them are presented.Simulation results show that the multilevel localization model can deal well with the error accumulation,and the position error can be reduced 16% than DV-Hop while the position error of communicate level nodes is 0.05 and edge measurement error is 0.3.关键词：large scale WSNs;wireless localization;multilevel localization model;localization error;error propagation2|1111|2更新时间：2025-07-16
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An Initial Study on the Applicability of Paulus-Jeske Model of Evaporation Duct in Chinese Sea Areas
摘要：The measurement of evaporation duct over sea is briefly described,and the influence of meauring error of hydrometeorological varuable on the Paulus-Jeske (abbr.P-J) model is also analyzed.According to the refractive index section and the offshore hydrometeorological data at partial internal sea areas collected experimentally in different weather conditions in recent two years,the conditions applying for P-J model and the difference between evaporatiion duct height estimated by PJ model and that by actual measurement are studied.the result have good refering values for he correction of evaporation duct model and the forecast of the maximum radar detection range in the condition of evaporation duct.关键词：atmospheric duct;evaporation duct;refractive index section;propagation factor2|1442|11更新时间：2025-07-16 - 摘要：Existing pointer analysis algorithms usually adopt a lower-level intermediate representation which can not sufficiently represent the syntactical structure and the semantic of programs.This makes them difficult to apply to program standardization.To solve this problem,a flow-sensitive and context-sensitive pointer analysis algorithm based on control dependence tree is presented in this paper.The control dependence tree is used as the intermediate representation for the source program,and an improved point-to representation is proposed to represent alias information.Based on this,data flow equations are defined to compute the point-to information by traversing the control dependence tree.Test results show that its accuracy is higher than that of Emami’s approach,and it can greatly improve the variation removal rate of the program standardization.关键词：program standardization;pointer analysis;pointer alias;control dependence tree2|1232|4更新时间：2025-07-16
- 摘要：A kind of multi-dimensional data compression algorithm for cluster-based protocol is proposed.The purpose of algorithm is reducing the wireless traffic without decreasing the accuracy of sensing information in wireless sensor network.Further more;a kind of clustering routing strategy,based on multi-dimensional data compression algorithm,is achieved.The experiment and simulation results show that wireless traffic can be significantly reduced by using the routing strategy based on this data compression algorithm.And the life of wireless sensor network can be prolonged.关键词：data compression;cluster-based routing;routing;wireless sensor network2|1586|5更新时间：2025-07-16
- 摘要：There has been a recent growth of interest in codes with respect to a newly defined non-Hamming metric grown as the Rosenbloom-Tsfasman metric (RT,or ρ,in short).In this paper,the definitions of the Lee complete ρ weight enumerator and the exact complete ρ weight enumerator of codes over ring Z4 are given,and the MacWilliams identities with respect to this RT metric for the two weight enumerators of linear codes over Z4 were proven respectively.It is not necessary,according to the identities,to obtain the dual code C⊥ of the Z4-linear code C,we can get the Lee complete ρ weight enumerator and the exact complete ρ weight enumerator of the dual code C ⊥ directly.关键词：RT metric;weight enumerator;MacWilliams identity;linear code;dual code2|1264|10更新时间：2025-07-16
- 摘要：In this paper,we extend the Yao’s millionaire problem to the multi-party multi-data ranking problem,which involves n parties P1,P2,…,Pn and eachhas a private data set DP1{1,2,…,N}.It forms a ranking problem in D=DP1∪DP2∪…∪DPn,which requires the Pi can get no more information beyond the orders of the elements in DP1{1,2,…,N}.We propose a protocol based on RSA homomorphic encryption in semi-honest model for this problem and analysis the correctness,security and efficiency.关键词：encryption;secure multi-party computation(SMC);computationally indistinguishable;homomorphic encryption;data ranking2|1618|13更新时间：2025-07-16
- 摘要：Two properties of Super-Resolution calculation for image super-resolution reconstruction are proved,and a new texture adaptive super-resolution algorithm is proposed based on MAP(Maximum a posteriori)model.In Super-Resolution reconstruction process,an initial high resolution image with higher quality is calculated firstly by approximate calculation,and then trilateral model is applied as a regularization term in MAP model to preserve slope edge and roof edge.The fusion parameter and regularization parameter can be adaptively computed by image texture without manual adjustment.Simulation results confirm the effectiveness of this algorithm and demonstrate its superiority to other super-resolution algorithms.关键词：super-resolution;property;Maximum a posteriori(MAP);texture adaptive;trilateral regularization2|1425|4更新时间：2025-07-16
- 摘要：A low-dropout regulator (LDO) with fast-transient response speed is presented by utilizing the proposed transient response enhancement (TRE) circuit,which doesn't bring the quiescent current increase.The proposed LDO has been fabricated in a 0.5 μm standard CMOS process,and the die area is 0.49mm2.The proposed LDO dissipates 23 μA quiescent current at no-load condition and is able to deliver up to 200mA load current.With a 1 μF output capacitor,the maximum transient output-voltage variation is within 3.5% of the output voltage with load step changes of 200mA/100ns.关键词：linear regulator;low-dropout regulator (LDO);fast-transient response;power management ICs4|2509|6更新时间：2025-07-16
- 摘要：The reconfigurable processor architecture for multimedia application consists of a host processor and a coarse-grained Reconfigurable Cell Array (RCA) as the coprocessor,which can be reconfigured dynamically.The proposed co-design flow is based on loop pipeline and pipelined reconfiguration technologies.Heuristic algorithm is used for hardware-software partition of big kernel loop and a table schedule algorithm for the mapping of task graph.They have been verified in FPGA with some kernels in H.264 baseline.The average speedup is 3.34 times compared with PipeRench,MorphoSys,and TI DSP TMS320C64X.关键词：reconfigurable;loop;hardware-software partition;mapping2|1428|8更新时间：2025-07-16
- 摘要：Frank operator cluster satisfy compatible theorem,the flexible probability logic operator based on Frank T/S norms,is a effective study which solve the problem of probability logic uncertain reasoning in the framework of logics.Aimed at solving the problem of limitation on the correlativity of the traditional probability logic operator,the paper uses the generalized correlation coefficient h to establish a connection with correlativity,and constructs a set of flexible probability logic operator based on Frank T/S norms,whose operation relation can changes continuously with h.The theory prove that the operator not only can satisfy basic axiom of probability measure,but also show the continuous monotone variability.关键词：frank compatibility operator;T/S norms;flexible probability logic operatorl2|749|1更新时间：2025-07-16
- 摘要：An improved characteristic waveform decomposition based on nonnegative matrix factorization was proposed.Two methods based on Bayesian Ying-Yang(BYY)harmony learning and rival penalized competitive learning(RPCL)to compute factorization rank of nonnegative matrix factorization(NMF)were proposed.Computational complexity is decreased and speech quality is not decreased obviously.Mixed autoregressive model for construction of WI phase was proposed according to the energy of CW and coding matrix,which improves the naturalness.In the end,a low complexity NMF-WI speech coding at 2kb/s was developed.NMF based on Kullback-Leibler divergence and Mel scale band-partitioning initialization used for basis vectors were proposed,and CWs were classified into six based on pitch distribution.In CW factorization,computational complexity dropped by 10 MOPS.Speech quality is increased,and equivalent to 2.16kb/s NMF-WI using 4bit phase VQ.关键词：speech coding;waveform interpolation;characteristic waveform;non-negative matrix factorization2|1446|3更新时间：2025-07-16
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