最新刊期
卷 31 ， 期 S1 ， 2003
- 摘要：As the software plays more and more important roles in today's information society,the software reliabitity,safety and security are strongly required.The state of art of its engineering technologies for this high confidence software and the challenges it faced are descirbed in this paper.Based on the formal methods,this confidence software developing trends and its key technical points are also discussed.关键词：software engineering;high confidence software;software assurance4|6221|0更新时间：2025-07-16
- 摘要：Distributed small satellite synthetic aperture radar (DSS-SAR) is a new way to observe the earth's surface from space,which is proposed in the last years of the 20th century.In this paper,the DSS-SAR technique and its research progress are mainly discussed.After a brief review of its recent progress,the concept of DSS-SAR is described and its mission and means of implementation are presented.At last,the key problems and the prospect in this field are pointed out.关键词：DSS-SAR;topographic mapping;GMTI;imaging3|3497|0更新时间：2025-07-16
- 摘要：Human-computer interaction is a complex of technical science,which investigates the interaction and communications through mutual understanding between human and computers to solve problems of information managements,services and processing in maximized degree for human needs.This paper proposed a conceptual model of new generation (fourth generation) human-computer interaction systems and their four major features:(1) the ways for interaction are through multimodel perceptions (hearing,vision, gestures and pen writing); (2) the interface for interaction is through the intellegent agents,who may understand user's requirements and implement all required processing by machine through auditory/visual diologues; (3) the contents for interaction may be performed by techniques of content based text or image/video retrieval; (4) the display environment of interaction may be realized in 2-D or 3D through virtual browsing the 3-D scene of computer graphics reconstructed by 3-D computer vision technique.In this paper the possible solutions and algorithms to implement these four major features are given and the platform of the 4th human computer interative system is also described.关键词：human-computer interaction;multimodel perceptions;multifunction perceptions;intellegent agents;spoken language dialogue;information fusion calculation2|4750|0更新时间：2025-07-16
- 摘要：Facial expression synthesis,facial aging and the reconstruction of the invisible facial views are important research contents in the computer vision and computer graphics fields.This paper addresses the statistical model-based techniques of facial image transformation and processing.With the pixel-wise correspondence computing,the facial image is represented as coupled shape-texture vectors.Based on the quotient image of Lambertian surface classes,an algorithm for realistic expression synthesis and clone is first proposed.Then,the new technique for face juvenility transformation from average face,according to the related hypotheses for face attractiveness in Psychology,is presented.Finally,an ageing transformation algorithm is proposed from merging the age template mapping and the distinctiveness caricaturing methods.With the examples of MPI Caucasian Face and AIAR Asian Face databases,realistic and natural experimental results validate the approaches for the facial expression synthesis and facial age transformation.关键词：facial image transformation;facial image processing;expression synthesis;facial aging;view transformation2|2734|0更新时间：2025-07-16
- 摘要：The reconstruction technique of the invisible views of human head belongs to the statistical technique for predicting unknown information.This paper researches on the sequential novel view synthesis or the 3D model computing from a single facial image.An advanced framework for the invisible sequential view reconstruction,which includes discrete view database creating,single view input and model matching,view space projection and view morphing,is presented.The techniques can generate realistic face appearances and invisible views with limited prior information bypassing the building of 3D models.The practical experiences for the AIAR face database creation under limited shooting angles and conditions are also presented at last to help implement the view reconstruction techniques.关键词：facial image processing;expression synthesis;facial aging;view transformation;facial image database2|1539|0更新时间：2025-07-16
- 摘要：Parametric Yield of VLSI is an important factor related with manufactory cost and circuit performance.With development of deep sub-micron IC technologies,chips have led to a large increase in system complexity and the number of devices per die as well as the switching speeds.These advances have been accompanied by parametric yield loss due to the fluctuations in the manufactory process.Firstly,models and design technology of parametric yield is systematically discussed in this paper.Their advantages and disadvantages are discussed in details.Finally,the main problems and developing direction of parametric yield design and enhancement in very deep sub-micron regime are given.关键词：VLSI design methodology;parametric yield;optimal design2|2120|0更新时间：2025-07-16
- 摘要：The aim of Multiscale Geometric Analysis is to find a kind of optimal representation of high dimension function in the sense of nonlinear approximation.Based on the nonlinear approximation of 2-D function,the mathematical and neurophysiological backgrounds of Image Multiscale Geometric Analysis are studied on this paper,and its development history,current and future challenges are reviewed in details.关键词：multiscale geometric analysis;wavelet transform;bandelet transform;ridgelet transform;monoscale ridgelet transform;Curvelet transform;contourlet transform2|5312|0更新时间：2025-07-16
- 摘要：As a novel evolutionary computation technology,swarm intelligence is now becoming a new research hotspot.It has special relationships with artificial life and evolution strategies.All researches of theories and applications related to swarm intelligence proves that it is a kind of effective method to solve most global optimal problems.It is more important that its potential parallel and distributed features provide technical assurance to process data in large database.A survey of origin and development of swarm intelligence are presented.Furthermore,the basic principles and contemporary research status of two typical algorithms:Particle Swarm Optimization and Ant Colony Optimization,are discussed.关键词：swarm intelligence;particle swarm optimization;ant colony optimization;optimization algorithm2|4686|0更新时间：2025-07-16
- 摘要：Patent of scientific research is one important aspect which reflects the fruits of scientific researches,and patent application itself is one of the most important scientific researches as well,whereas it has not been paid enough attention for a long time in scientific literature.We analyze data mining patent grant in us patent & trademark office database,which is authoritative in the world.We introduce some typical patents in the fields which are concerned with most patents,including association rules,web mining, clustering algorithms,and parallel data mining etc.In the end,we present data mining topics which are currently blank in the field of data mining patent.关键词：data mining;patent;association rules;web mining;clustering algorithms;parallel data mining4|2545|0更新时间：2025-07-16
- 摘要：According to some disadvantages in the disposal process of the perturbation method, the concepts of perturbation quantity, constant quantity and stepwise disposal have been introduced.For the case of dielectric waveguide,we have obtained the more accurate two orders perturbation results of resonant cavity and waveguide.关键词：generalized perturbation method;perturbation quantity;constant quantity;stepwise disposal4|1028|0更新时间：2025-07-16
- 摘要：For resolving the problem that the CS algorithms couldn't compress SAR data in range direction using the original signal with errors,the author introduced an Equivalent-Squint Wavenumber Domain algorithm.In this paper,the Squint-Range-Model based wavenumber domain focusing algorithm for high resolution spaceborne SAR is derived from original response signal using Bamler's method in accordance with the equivalent squint range model.This algorithm is suitable for precise imaging of high resolution spaceborne SAR with large range cell migration.Simulated data of point scatterer response is used to demonstrate the effectiveness of this algorithm and the evaluated result is given.关键词：wavenumber domain algorithm;equivalent-squint-range-model;spaceborne SAR2|1049|0更新时间：2025-07-16
- 摘要：One of the principal problems in studying the substrate integrated waveguide (SIW) is the transition of SIW with other types of transmission lines.Recently a taper transition between microstrip line and SIW has been proposed.In this paper,the idea has been extended to more general cases,and several new transition types have been developed,including the direct,concave,and convex transitions,and the transition with multilayers.An experimental study has been made at the C band,which shows that a VSWR less than 1.2 through the band 4.1 to 5.5GHz and an insertion loss better than 0.5dB can be obtained.关键词：transition;waveguide;SIW;hybrid circuit2|4120|0更新时间：2025-07-16
- 摘要：The performance of range resolution and signal-to-noise of the bistatic synthetic aperture radar is analyzed based on the radar range equation in this paper, and the results of computer simulation are presented.关键词：bistatic synthetic aperture radar;range resolution;signal-to-noise ration2|1291|0更新时间：2025-07-16
- 摘要：A novel low-sidelobe microstrip antenna with sum and delta channels is designed.The low sidelobe corner-fed printed square patch antenna is studied.A hybrid ring circuit located on the center of the antenna performs the addition and subtraction of the signals from different ports.The antenna is capable of acquiring the range and angular information of all obstacles in its field-of-view simultaneously without using a scanning or switching antenna.Design, simulation and optimization are carried out using softwares of Ansoft Serenade and Ensemble.The results of experiment is similar to the results of simulation.It is obvious that this kind of antenna is able to meet the design target.关键词：antenna;microstrip antenna;patch antenna2|1021|0更新时间：2025-07-16
- 摘要：Expanding of Field-of-view for small F-number millimeter wave focal plane imaging is analyzed in this paper.Ray tracing method is used to calculate the spot pattern for different lens section plane,and then lens section plane of available dielectric material is optimized to reduce aberrations,so as to expand the field-of view.Vector aperture field method,which combines ray tracing and diffraction integral,is used to compute the diffraction field distribution in the focal plane of the imaging lens.Good agreement between calculation results and experiments has been found.关键词：millimeter wave;focal plane array;imaging;extending field-of-view2|1761|0更新时间：2025-07-16
- 摘要：A model of microstrip bonding wire interconnects for millimeter wave applications is presented, which is based on neural network methods.The results from a FDTD full-wave algorithm have been used in the learning procedures of the neural network.The model can be applied to the design of millimeter wave integrated circuits.The scattering parameters of the bonding wire, which are related with the gap between microstrips, the height of bonding wires and the operating frequency, have been simulated by the neural network model.The scattering parameters of a bonding wire interconnect has been measured and compared with the results from the neural network model.关键词：microstrip interconnection;neural network;FDTD2|1216|0更新时间：2025-07-16
- 摘要：The optimization characteristic of equal-ripple general Chebyshev functions is described in this paper,and the filter synthesis from design target using these functions is represented.Further more,the introduction of signal flow chart is very helpful in determining the topological structure of the filters.This paper is highly valuable in design of the filters with finite transmission zeros.关键词：general chebyshev function;filters;optimization characteristic2|1825|0更新时间：2025-07-16
- 摘要：The Noise-immune algorithm is applied to unwrap the InSAR data.The characteristic of the Noise-immune algorithm is analyzed.In order to get a better result in the unwrapping of the InSAR data using the Noiseimmune algorithm,a refinement is presented.Based on the two-point criterion,the three-point criterion is presented.In order to improve the stability of phase unwrapping,we present a hybrid algorithm which is formed by combining the two-point criterion and three-point criterion.When unwrapping the interferogram of bad quality,the two-point method may be not convergent,the hybrid algorithm can solve this problem.The hybrid algorithm can improve the stability of phase unwrapping without losing the accuracy.The computer simulation result of the simulated data and true InSAR data proves the validity of our algorithm.关键词：noise-immune algorithm;interferometric SAR;phase unwrapping2|962|0更新时间：2025-07-16
- 摘要：The thermal mechanism errors of deployment distortion in phased array antenna of spaceborne Synthetic Aperture Radar (SAR) play an important role in the ambiguity performance analysis.A mathematic model for deployment distortion error is founded according to the characteristics of the phase array antenna on SAR satellite.Based on paired echo theory, the expression of antenna pattern function under deployment distortion errors is obtained.The statistic model of the SAR ambiguity performance analysis with antenna deployment distortion errors is proposed.The ambiguity performance analysis method for deployment distortion errors is presented.The computer simulation results are presented with a L-band space-borne SAR phase array antenna, by which the correctness of the conclusion is validated.关键词：synthetic aperture radar;phased array antenna;performance analysis2|751|0更新时间：2025-07-16
- 摘要：A main problem of air borne SAR-MTI system based on DPCA technique is the performance decline of clutter suppression and moving target detection caused by the dissatisfying of DPCA condition,which is conduced by the velocity variety of radar platform.On the ground of interpolation theory,a new calibration method for this problem is presented in this paper.Based on signal model,system error is analyzed and the calibration method is provided.The key issue for the calibration precision is the accurate estimation of the velocity of radar platform,which can be obtained by conventional movement parameter estimation methods.It is demonstrated by the simulation results that the system error can be successfully removed by this method.Since the requirement to hardware instruments is reduced,this method can be easily realized in engineering practive.关键词：synthetic aperture radar;moving target detection;displaced phase center antenna4|1328|0更新时间：2025-07-16
- 摘要：Virtual studio is a new application of virtual reality in TV program production.In this paper, we discuss the key techniques of camera electromechanical tracking, camera calibration and alignment, virtual scene rendering, system synchronization and composition in V irtual Studio based on electromechanical tracking.关键词：virtual studio;electromechanical tracking;camera calibration;camera alignment;chromakey;synchronization;virtual reality4|1125|0更新时间：2025-07-16
- 摘要：The research on the high-resolution synthetic aperture radar (SAR) image automatic terrain classification (ATC) is made.Firstly,the shortage of the traditional feed-forward neural network model in SAR image classification is concluded.Then a new model named mixed double hint layers RBFN (MDHRBFN) is presented,which combines radial basis function network (RBFN) with mixed expert system.Finally,an algorithm based on this model for the high-resolution,single-look and single-polarization SAR images terrain classification is given and evaluated.The results show that this algorithm can readily cluster the SAR image into man-made targets,natural target,background and shadow,and has better performance than the one based on RBFN model.It can not only be applied to SAR image assistant interpretation,but also offer the potential target chips for target recognition process.关键词：SAR image;neural network;terrain classification2|1220|0更新时间：2025-07-16
- 摘要：The fast far field approximation (FAFFA) technique is employed in the hybrid physical optics-moment method (PO-MM) to speed up the matrix-vector product in the solution of matrix equation.New formulas accounting for the electromagnetic interaction among far-field groups have been derived.The computational complexity of the proposed technique is analyzed.The calculated results of radiation pattern,input admittance and mutual admittance of wire antennas on a complex platform are in good agreement with those in literature.Numerical results of wire antennas mounted on a ship model are also presented,which illustrate the accuracy and efficiency of the proposed technique.关键词：fast far field approximation;hybrid physical optics-moment method;complex platform;wire antenna;electromagnetic behavior2|1020|0更新时间：2025-07-16
- 摘要：Watermarking technique has been widely applied to multimedia data as an effective method for ownership protection.The increasing use of relational databases is creating a similar need for applying this technique to databases in order to associate ownership of these databases with their owners.This paper presents a robust algorithm for embedding a string of bits into a database relation.by improving the current relational database watermarking algorithms.We also show how to adjust parameters according to different robustness and imperceptibility requirements.Using implementations running on Oracle,we demonstrate that the performance of our algorithm allows for its use in real world applications.关键词：watermarking;ownership protection;relational databases3|2511|0更新时间：2025-07-16
- 摘要：Based on Pervasive Computing, this paper proposes a Manageable Multimedia Network Computer——MMNC.MM-NC adopts a new computing paradigm, information storing and management on server while computing and providing user interface on client.Through MRBP, MMNC provides user with customized system.By virtual swap and scheduling, MMNC can download program code of application from server and execute, thus realizes none OS on client and program loading on demand.MMNC has great flexibility and extensibility, with low cost and high-level security also realized.关键词：network computer;remote boot;virtual swap4|2288|0更新时间：2025-07-16
- 摘要：Process patterns reuse is an effective way to improve the software process.Since each software project is unique,it is not possible to define a detailed and general process model for all software projects.In the paper,a hierarchy process pattern dynamical reuse method was proposed.Ontology based pattern description and event based process model were applied to facilitate reuse.It also discussed process composition method and an automatic process pattern reuse method according to the software product structure.The system structure that can support this concept was also introduced.关键词：software process control;process pattern;hierarchical process pattern2|756|0更新时间：2025-07-16
- 摘要：The influence of negative bias temperature instability (NBTI) on P+ polygate PMOSFET's was analyzed.The pre and post-stress degradation of device characteristics and key parameter was obtained from the NBTI stress experiments.Based on this experimental result,the electrochemical reaction which water act as a reactant is the main cause of NBTI mechanism.Lastly, some methods was brought up to suppress NBTI effects.关键词：NBTI effects;PMOSFET;interface trap;fixed oxide positive charge2|2541|0更新时间：2025-07-16
- 摘要：Based on the combining of the quantum evolutionary algorithms (QEA) with the main mechanisms of clone,an improved evolutionary algorithm—quantum clonal evolutionary strategies (QCES) was proposed in this paper.By adopting the high-effective parallelism of QEA and replacing clone operator by mutation and selection of the classical evolutionary algorithms (CEA),it has better diversity and the converging speed than CEA and avoided prematurity.The convergence of the QCES is proved and its superiority is shown by experiments in this paper.关键词：clone operator;evolutionary algorithm;quantum clonal evolutionary strategies2|1635|0更新时间：2025-07-16
- 摘要：Geometric attack is an open problem to digital watermark.Current techniques could not solve it effectively,especially for block-based watermarking.In this paper,a new method is proposed to provide an easy-use and robust detection to geometric transform parameters.A rectangle frame in an image is utilized to estimate the coefficients of geometric attack and locate watermarking.Median filtering and sharpening on the rectangle frame are used to enable a more accurate estimation.Cropping attack is also detected by the method.The geometric distortion's correction based on the estimation results is performed to make watermark synchronized by the template matching.Experimental results verify that this method provides an accurate estimation and a nearly lossless restoration of watermark.关键词：rotation;scaling;crop;geometric correction;digital watermarking2|1371|0更新时间：2025-07-16
- 摘要：Transaction is one of the key technologies whether Web Services can be applied to e-business applications.Transaction technologies for Web Services have to provide the abilities to coordinate short-lived and long-lived transactions.This paper proposes a Web Services transaction model, which can simultaneously handle Atomic transaction and Cohesion transaction, and researches corresponding coordination algorithms, state conversion and recovery mechanisms.Cohesion transaction allows candidates to commit independently, and undoes committed sub-transactions through the compensation transactions so that it can satisfy the requirements for long-lived transaction in Web Services environment, and provide powerful support for commercial web services.关键词：web services;model;atomic transaction;cohesion transaction;compensation transaction2|1230|0更新时间：2025-07-16
- 摘要：A model of source distortion for video transmission over IP network is discussed and verified by two typical video encoders.A packet-based channel coding method is proposed,which is applied to distortion estimation of channel coding.Based on the proposed method,two novel strategies oriented to joint source channel coding are presented.Test results show that optimal coding schemes depending on proposed strategies improve video reconstruction quality to high extent.关键词：IP network;distortion estimation;joint source channel coding2|1124|0更新时间：2025-07-16
- 摘要：The analysis of curdy and greasy property of tongue fur is of great significance in Traditional Chinese Medicine characterization and modernization.An image analysis method of curdy and greasy fur based on texture feature is proposed in this paper.First, the tongue fur region is divided into blocks with the same size; then the blocks is classified; finally the greasy index of the whole image is calculated.To classify the blocks, a modified subspace method is used to analysed the denseness of the coating texture, combined with the texture coarseness to indicate the fur grain size.Experimental results show that the correctness rate exceeds 83%, and the variances of greasy degree is also reflected.关键词：tongue image analysis;subspace method;texture coarseness2|1225|0更新时间：2025-07-16
- 摘要：In application of CMM, the general purpose of process improvement is fulfilled by successful completion of various projects within an enterprise.As an automated platform, the process support system (PSS) should have the ability to support dynamic change of process, in order to respond to the environments reactively.However, process change is so complex that single tactic adopted in PSS not only increases the process model's complexity but also weakens the reuse of the underlying technologies which have already been used in PSS.This paper proposes a multi-tactic support mechanism for dynamic change of process.This mechanism, used in PSS for CMM, increases the flexibility and usability of similar system to support process change.关键词：process dynamic change;process support system;CMM;process model;process improvement2|933|0更新时间：2025-07-16
- 摘要：The state machine formalism in UML is used for modeling discrete behavior of various system elements.Its rich notation provides a powerful description mechanism which meanwhile decreases modality of its structure and increases verifying complexity.Model checking is a technique for automatically verifying finite-state concurrent systems.By model checking the behavior of various system elements described by SM,we can find design errors as soon as possible.This paper defines an operational semantics for SM using Kripke structure in order to model checking SM.Different from existing SM semantics definitions,this paper takes undetermined factors in SM into consideration.SM is translated into kripke structure that describes all possible evolving traces on which model checker checks.关键词：UML;SM;Operational semantics;Kripke structure;model checking2|1461|0更新时间：2025-07-16
- 摘要：Synchronizing software implementation and test with executable specifications could find flaws as early as they occurred in each development stages.The mathematical foundation of this paradigm is that abstract state machine (ASM) and its testing tools are AsmL for.NET.After introducing of the paradigm based on executable specifications and the definitions of ASM, a high level semantic model for grids written in ASM is presented.In order to show the complete processes of analyzing and testing software design with ASM, using AsmL to produce finite state machines for software model of resources mapping and resources request is also illustrated.This paper argues that AMS based system design and analysis for grids deserves attentions from both computer academy and computer industries.关键词：ASM;AsmL;grids;software test;executable specification;finite state machine2|1020|0更新时间：2025-07-16
- 摘要：Because the concept of stereotype in UML is not precisely defined, users and researchers often misused this kind of extension mechanism of UML, and modeling tools that support stereotype mechanism can not be well developed by the doctrine in UML.In this paper, we formally define the concept of stereotype in UML, and on this base, research the transformation from stereotype to meta model and the instructive rules of using stereotype.The research in this paper can help the user of stereotype understanding this kind of extension mechanism deeply, and provide reliable theory base for the development of modeling tools that support stereotype mechanism.关键词：UML;extension mechanism;stereotype;formalization;syntax;semantics4|1431|0更新时间：2025-07-16
- 摘要：A process model of software process metrics is presented, and the strategies for tracking and controlling metricsbased software process are described and analyzed.Based on this and the practice of implementing CMM, a software process control optimization model and dynamic programming algorithm is developed and designed.When a schedule slip occurs, a project manager can immediately make an optimal process control decision to guarantee the success of the project by using the presented method together with the corresponding historical data stored in the process database.关键词：software process;capability maturity model;process database;process control2|1117|0更新时间：2025-07-16
- 摘要：Component description plays an important role in the management of components.With the evolution of the component technology and Web techniques,more on-line components become available.Thus,it becomes an urgent need to provide a basic description model for both on-line and off-line components in order to support their management.In this paper,we propose a Basic Component Description Model (BCDM) that supports the management of on-line components.This model is an extension of the standard reuse library interoperation model-BIDM.Based on the structure of BIDM,we incoperate some essential features for managing on-line components.As a result,the BCDM can effectively support the description and management of on-line components,and lay a foundation for interoperation among the component libraries.关键词：component repository;description model;on-line component;BIDM2|997|0更新时间：2025-07-16
- 摘要：The heterogeneity between middlewares can be solved by customization or extension of interoperability protocols according to diverse application requirements without changing existing infrastructures.In this paper, we present an open interoperability framework.The basic idea is to introduce componentization into design and implementation of interoperability framework and protocols.We encapsulate the main functions of protocols into components so that the customization and extension can be achieved by using this framework to add, delete and replace corresponding components.This paper implements this framework and several mainstream protocols and then evaluates the performance.关键词：interoperability;middleware;component;J2EE2|845|0更新时间：2025-07-16
- 摘要：The new approach is applicable to identify various SIMO transmission channels with common zeros if only the common factor of those channels satisfies a sufficient and necessary condition presented by our paper.The new approach consists of the following stages:firstly, transmitted signals in given alphabets are blindly detected by using a quadratic optimization with integer constraints; then, the SIMO transmission channels are identified on the basis of the estimated signals.Simulation results show that the new approach delivers better performance compared with the ex isting approaches.关键词：blind identification;quadratic optimization;common zeros;SIMO channel2|862|0更新时间：2025-07-16
- 摘要：Discrete wavelet transform has often been used for multi-scale texture characterization through the analysis of spatial-frequency content.Most previous methods make no account of the correlation of coefficients in adjacent subbands.However,in intuition,the coefficients in adjacent subbands are highly correlated.A novel method for texture feature extraction is now proposed based on the statistics relationships of wavelet coefficients at adjacent scale subbands with the same orientation.In addition,taking into account the fact that most of current images are stored and transmitted in the compressed format,we try to make the proposed method compatible with the new generation image compression standard-JPEG2000.Therefore,texture classification can be performed directly on the compressed DWT domain (just entropy decoding needed).Experimental results show that the proposed scheme has outperformed the previous methods,and the best performance is achieved by combining cross-subband relationship and traditional subband energy.关键词：texture classification;multi-scale analysis;discrete wavelet transform;co-occurrence matrix;compressed domain2|1369|0更新时间：2025-07-16
- 摘要：This paper proposes a spaceborne electronic and imaging reconnaissance data fusion system.With the platform registration algorithm based on nonprecision map matching and the target fusion identification method based on fuzzy reasoning and evidential theory,a data fusion simulation system of spaceborne electronic and imaging reconnaissance is founded.Simulation results demonstrate that this system has superior target orientation and identification performance.关键词：spaceborne electronic and imaging reconnaissance;data fusion;target orientation;target identification2|2483|0更新时间：2025-07-16
- 摘要：This paper introduces an application of biometric watermarking algorithm based on the fingerprint minutiae data in Automated Fingerprint Identification system (AFIS).The reference copy of the fingerprint minutiae data is embedded in a host image that is the digital copy of the personal identification paper,such as ID card.The biometric data is hidden in every corresponding personal identification paper,instead of storing in the biometric database,which greatly promotes the security of AFIS.This algorithm is also robust to the J PEG compression and geometric distortion.Furthermore,the fingerprint data provides an additional cue in authenticating the personal identification paper.Experimental results show that authentication with more security is performed provided that the identification system works effectively using the watermarked identification card,and the algorithm is robust to some attacks.关键词：biometric watermarking;fingerprint identification;authentication2|1360|0更新时间：2025-07-16
- 摘要：Genetic algorithm (GA) is used for the synthesis of thinned arrays (whose elements are thinned from the uniform grid),which uses not only element spacings but also element excitation as variables,so it provides more degree of freedom to control the characters of thinned arrays.The weighing of antenna element can be realized in digital beamforming antenna systems through digital signal processing.Because the spacings of thinned array are the integral times of grid,so the approach based on a combination of GA and fast Fourier transform (FFT) is used to speed up the evaluation of array pattern so as to save the calculation time dramatically and improve the optimization efficiency.关键词：thinned arrays;genetic algorithm (GA);fast Fourier transform (FFT);digital beamforming antenna5|2424|0更新时间：2025-07-16
- 摘要：Immune algorithm combines entropy and adopting selection rule of thickness.It increases the individual's number of high fitness and decrease that of high thickness, therefore, makes algorithm convergent with multiplicities.Using immune algorithm and finite element method, an E-plane branch-waveguide coupler is optimized.After comparing with existing optimization methods, the result indicates that microwave circuit optimization based on immune algorithm has the advantages of high efficiency and accuracy.关键词：immune algorithm;finite element method;branch-waveguide;coupler2|947|0更新时间：2025-07-16
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Study on the Parallel Modified Locally Conformal FDTD Algorithm on Cluster of PCs for PBG Structures
摘要：MPI based parallel 3D FDTD is studied with the support of Cluster of PCs.With parallelized locally conformal FDTD technique, a type of photonic band gap(PBG) structure in microstrip transmission line is analyzed.The comparison of the Parallel Conformal FDTD simulations with Moment Method results shows an excellent agreement.关键词：conformal FDTD;parallel FDTD;PBG;cluster of PCs2|1040|0更新时间：2025-07-16 - 摘要：This paper proposes a method of interference suppression for a random planar array.Orthogonal transform are performed certain times on the signals.Then an average covariance matrix can result from all the covariance matrix of the transformed signals and from which a weight can be determined by a rule of Max SNR.The validity of the method is illuminated by computer simulation.And the method can constrain the interference efficiently and has no limits about the correlations among the interference signals.关键词：random planar array;orthogonal transform;interference suppression2|935|0更新时间：2025-07-16
- 摘要：For the question of carrier acquisition and tracking of high- dynamic spread spectrum signals, the analysis is presented for the influence of Doppler frequency shifts to the design of PLL(Phase-Locked-Loops), FLL (Frequency-Locked-Loops), and loop filters.Also, the question of fast carrier acquisition for high-dynamic spread spectrum signals is analyzed.The new design method of digital complex soft loops is proposed, and the simulation results show that the question of fast carrier acquisition and tracking is solved by this digital complex soft loops.关键词：spread spectrum communication;carrier tracking;high-dynamic4|1978|0更新时间：2025-07-16
- 摘要：A method to design domain specific software framework is put forward, which is based on analysis on traditional business operations and generalization of simple application frameworks.Core operations and accessory operations are recognized in traditional business operation processes, and the operations are formalized and simplified in order to form a simple single-functioning application framework,which can be extended to the whole domain by comparison and generalization with other frameworks on the same core operations.The main point of this method is to build up a comparatively simple but effective application framework before a more complex and generalized domain framework can be constructed.关键词：develop method;software framework;domain engineering2|1082|0更新时间：2025-07-16
- 摘要：A new principal component analysis (PCA)-based minimum description length (MDL) type criterion (termed PMDL) is proposed in this paper to solve the key problem of class number selection in unsupervised classification.It is based on the fact that data of different dimensions after PCA transform should be encoded with different code length,as they represent different amount of data variance.We perform unsupervised classification to hyperspectral image by Gaussian mixture modeling,estimate the parameters of the mixture model using the expectation maximization (EM) algorithm in merged operations to data after PCA linear projection,and select the number of components according to the proposed criterion.Experiments on a set of synthetic data verify the new criterion.The whole algorithm performs quite effectively and gives proper class number without any prior information applied to real data.关键词：unsupervised classification;Gaussian mixture model;expectation maximization algorithm;principal component analysis;principle of minimum description length2|1097|0更新时间：2025-07-16
- 摘要：Sensor management can be described as a system or process that provides automatic or semi-automatic control of a suite of sensors or measurement devices, it improves the performance of sensing and gives an effective usage of resources.This paper presents a general optimization model of sensor managemt and a new method is provided which is based on covariance control and manage sensor allocation by making the actual covariance matrix close to the desired one.This paper presents an analysis of covariance control for allocating sensing resources in centralized multisensor target tracking systems.Three sensor allocation algorithms are presented based on different matrix metrics.Simulation results show that this algorithm based on covariance control can allocate sensors effectively and save much more sensor resources.关键词：sensor management;sensor allocation;multisensor system;covariance control;data fusion2|1270|0更新时间：2025-07-16
- 摘要：The synthetic aperture radar (SAR) image terrain classification algorithm combining the respective characteristics of Beta-prime (BP) statistic model and quadratic Gamma discrimination (QGD) classifier is presented.Through classifying background clutter and target by BP model,and classifying natural target and man-made target by QGD classifier,this algorithm can cluster the SAR image into shadow,background clutter,natural target and man-made target.It can offer not only the information of background clutter and natural target,but also the potential target chips for target recognition process.关键词：SAR image;QGD classifier;BP statistic model;terrain classification2|1115|0更新时间：2025-07-16
- 摘要：Performance analysis of workflow has been drawing researchers attention.It is difficult to analyze the performance of workflow when the model is large and complex.This paper gives analytic method to analyze the performance of a kind of workflow models that can be nested by four basic workflow models, i.e.the sequent, parallel, choice and iteration model.First, deduces the performance equivalent equations of the four basic workflow models, then discusses how to nest the four basic models into an actual model, how to analyze the performance of the new nested model and get its product-form solution.关键词：workflow models;performance analysis;Petri nets2|986|0更新时间：2025-07-16
- 摘要：Agent-oriented requirement analysis focuses on determining a higher-level organization of a system that meets a given problem specification.This paper presents the FKAOS agent-oriented requirement engineering method,which helps users and system designers analyze and describe the higher-level agent-centered requirement of software systems.FKAOS extends KAOS by modeling the uncertain property of MAS.It integrates a fuzzy version of Z with the KAOS language.The diagrams of FKAOS extend the goal and responsibility diagrams of KAOS and add some new diagrams and tables to describe the agent-oriented requirement.Based on the matemodels of view diagrams,the FKAOS environment includes a goal decomposing modeling and an agent optimizing modeling to integrate the knowledge about agent-oriented software design principles,prototypical software architectures,and application domain.The paper illustrates the design in FKAOS through an example,focusing on the ability of FKAOS to provide a cooperative design environment.关键词：AORE;FKAOS;DESIRE;Fuzzy Z;KAOS;agent4|1140|0更新时间：2025-07-16
- 摘要：Observing two objects from a viewpoint in 3D space, one may occlude another.This phenomena is called occlusion relation.It is an important observer-centred spatial relation in Spatial Reasoning and Computer Vision.The existing occlusion models such as LOS and ROC are all based on the RCC (Region Connection Calculus) theory, which is not suitable for handling multi-dimensional objects.But in 3D GIS or other occlusion relation applied area, the dimensions of objects are multiple.So we propose the multi-dimensional spatial occlusion model (MSO).We first extend the RCC to MRCC for supporting multi-dimension; then define spatial occlusion relation based on MRCC.Finally we investigate the composition reasoning method of MSO.关键词：spatial occlusion relation;qualitative spatial reasoning;computer vision2|759|0更新时间：2025-07-16
- 摘要：The common methods of the protocol conformance testing include three steps:create model by the protocol specification; generate test suite from the model; execute this test suite.There are two problems in these methods:the first is low efficiency; the second is the actual range of testing being reduced.In this paper, a method about alterable test suite will be introduced to improve the efficiency by dynamically executing the test suite, and expand the actual range of the protocol conformance testing without depending on the protocol implementation.关键词：the conformance testing;fixed test suite;alterable test suite;testing tree2|999|0更新时间：2025-07-16
- 摘要：Under the condition of formation flying, the relation between InSAR phase characteristic and flat earth, was deduced as well as the relation between phase characteristic and terrain height.The influence of flat earth and terrain height to phase was thoroughly analyzed.Flat earth and terrain height have common effect on InSAR phase.Thus the phase can be written in the form of sum of 2 partial derivatives.An example of cone was given as simulated real terrain.Simulation of different look angle, different radar wavelength and different baseline length was performed.The simulated result was in accordance with theoretical analysis result.关键词：InSAR;formation flying;flat earth effect;terrain height effect2|1048|0更新时间：2025-07-16
- 摘要：This paper mainly researches on the buffer allocation and IP packet data loss rate.Through deep and comprehensive analysis of the queuing delay of IP packet of multiple sources, this paper gives some new analytic formulas for computation of QoS.These results can also be applied to calculate the QoS parameter in IP switch router.关键词：IP network;QoS;IP packet;On/off model2|1014|0更新时间：2025-07-16
- 摘要：Non-negative matrix factorization(NMF) is formulated as a large-scale optimization problem with linear equality constraints.To get better performance, a hybrid combining simulated annealing(SA) and gradient-based algorithm is designed.The simulated annealing gradually produces better solutions with the gradient-based algorithm serving as an "accelerator".Experimental results are presented to compare our method and the original method for learning NMF representation, which demonstrate the proposed method can learn basis images more spatially localized and perform better than the original one at later training stages.The comparison study on face reconstruction also shows that the proposed method leads to better results than PCA and the original NMF.关键词：subspace representation;non-negative matrix factorization;feasible direction method;simulated annealing;face reconstruction2|1215|0更新时间：2025-07-16
- 摘要：A mechanics-magnetic coupling macromodel for a magnetic microactuator with a Multilevel Meander is presented, in which the deformation curve of a microbeam is approximated by linear combination of the cantilever-beam's modal function.The integration for magnetic force is calculated by dividing the microbeam into several intervals, and the nonlinear equation set has been developed based on the magnetic circuit principle.The complexity of the macromodel depends on the selection of modal number.In comparison with previous conventional models, this macromodel accounts for the coupling between the beam deflection and magnetic force.The macromodel in this paper is validated by comparing its results with experimental results available in some literatures.2|825|0更新时间：2025-07-16
- 摘要：Active obstacle detecting and avoiding for autonomous robot are significant research fields.In the past,the vision system and motor controlling system of the robot have been developed independently.Most people ignored the relationship of these two systems,separated the close coupling,and reduced the ways to obtain more information.Here,a Vision-Action model is developed to describe the relationship between the robot vision and motor action,in which the coupling provides more information resources of the environment.In addition,reinforced learning is used for autonomous robot to avoid the dynamic obstacle based on this Vision-Action model.Our experiments in the method were carried out stably and in real time.关键词：vision-action model;obstacle avoiding;reinforcement learning;optical flow fields3|1329|0更新时间：2025-07-16
- 摘要：A model of 4H-SiC bipolar junction transistor (BJT) based on two- dimensional device simulator M edici is presented.The model, in which bandgap model, mobility model, generation and recombination model and incomplete ionization model are included, provides a design platform for 4H-SiC technologies and devices.The simulation results show that the common-emitter current gain is 32.4 while the base current IB equals to 1μA/μm with the breakdown voltage BVCEO more than 800V and the cut-off frequency fT close to 1GHz.关键词：4H-SiC;physical models;bipolar junction transistor3|1581|0更新时间：2025-07-16
- 摘要：This paper begins with a complete description of the complex Poynting theorem, followed by a rigorous study of the generalized resonance in a multi-antenna system.We discuss the condition generating the generalized resonance, which is the balance of the electromagnetic field energies stored in the antenna open system.The matrix expression of the generalized resonant factor is derived.Based on the energy dependence, we introduce the generalized Foster theorem for an arbitrary antenna system and the network quality factor Q to further describe the behaviors of the generalized resonance.Some practical examples show that the generalized resonance may take on the phenomena of strong and sharp field in the near field region and super-directivity in the far field region of the antenna system.关键词：multi-antenna system;generalized resonance;generalized Foster theorem;network quality factor Q2|736|0更新时间：2025-07-16
- 摘要：The variations of object's reflection light induced from illumination variations and uneven illumination distribution greatly reduce the detecting efficiency in the process of color object detection.The most familiar effects of illumination on color object detection are abrupt intensity changes and uneven illumination distribution in detection region.In this paper, the basic process of formation of color is studied and the fact that simple δ functions can approx imate corresponding sensor functions fairly well in many applications is presented.And a limited dimension vector quantizing the illumination variations is used to compensate the pixels color, so as to improve the adaptability to illumination variations.Its rationality is proved by practical application.关键词：illumination;object detection;color image;soccer robot2|1710|0更新时间：2025-07-16
- 摘要：Microelectromechanical switches have demonstrated great potential in microwave and millimeter-wave circuits for their superior high-frequency performance.Most of researches on MEMS switches were concentrated on the structural design and mechanical analysis of their beams.There are few researches that have been done to analyze the electromagnetic characteristics of the MEMS switches,especially the high-frequency impedance matching of the switches.In this paper,the on-state impedance matching formulation of MEMS switches is developed based on the results of the high-frequency transmission line,and the electromagnetic characteristics of MEMS switches are confirmed by using the HFSS software.This helps to design high-performance RF MEMS switches.关键词：MEMS membrane switches;Impedance matching;insertion loss;isolation2|1000|0更新时间：2025-07-16
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