最新刊期
卷 36 ， 期 10 ， 2008
- 摘要：Connectivity is the fundamental of the MANETs for end-to-end data transmissions.The robust network topology of MANETs is desired to meet the communication requirements,which has no hot spot nodes and can avoid network partition effectively.In this paper,the k -connectivity of MANETs is discussed,and an analytical expression of the probability of network k -connectivity is derived that enables the determination of the required critical transmitting range.The results of this paper are of practical value for the scenarios with high requirements on fault-tolerate of node failure in MANETs.关键词：mobile ad hoc networks;k-connectivity;critical transmitting range2|1230|4更新时间：2025-07-16
- 摘要：Confidentiality and Integrity are realized by the group key in secure group communications.Adapt to the limited computation and communication resources,the group key management protocol in MANET environment should have less computation and less complexity.The necessary property that the group key management protocol should have is analyzed.A new ID-based group key agreement protocol CEAGKP is put forward by introducing the key tree of STR protocol that has minimum traffic in fixed network environment combined with the ID-based public key cryptography.The protocol has strong security and scalability at less traffic and well suits the requirement of MANET.The simulation proves that CEAGKP scales well in MANET.关键词：MANET;identity;group key;agreement2|851|2更新时间：2025-07-16
- 摘要：In 2002,Boneh and Silverberg presented theory of multilinear forms and a multi-party Diffe-Hellman key agreement protocol using multilinear forms.H.K.Lee et al adopted certificates to authenticate group members and protect against middle-man attacks in this protocol.Subsequently,H.M.Lee et al deployed ID-base public keys other than certificates in the MAK protocol,and presented the ID-MAK protocol.Owing to simplicity of ID-base public keys,the ID-MAK Protocol is more efficient.In this paper,we analyze the security of the ID-MAK protocol,and have found that the ID-MAK protocol doesn’t really authenticate group members as claimed.Thus it cannot resist active attacks,and an adversary can pretend to be a legal member to obtain the group key.Based on the computational multilinear Diffe-Hellman assumption,we present two improved schemes to the ID-MAK protocol to remove this security defect.Both our improved protocols need only one round agreement.They support dynamic member change and key refresh.Our security analysis shows that they are secure.关键词：multi-party key agreement;authentication;ID-base public keys;multilinear forms2|2060|2更新时间：2025-07-16
- 摘要：Proxy Mobile IPv6 provides a means of network-based mobility management for mobile nodes without involving the mobile nodes themselves in the mobility signaling.To make Proxy Mobile IPv6 protocol feasible in mobile Internet,a new defined authentication protocol should be accompanied.To the best of our knowledge,no studies have been conducted in the area of Proxy Mobile IPv6 authentication protocol.This paper proposes an authentication protocol in Proxy Mobile IPv6.In addition to providing access authentication,the proposed authentication protocol prevents threats such as replay attack and key exposure.Also,we develop analytic models for the authentication latency and cost analysis.Then,the impacts of mobility and traffic parameters on the authentication cost and latency are analyzed,respectively.The results reveal that the proposed authentication protocol for Proxy Mobile IPv6 is secure and effective.关键词：proxy mobile IPv6;authentication latency;authentication cost;analytic model2|1140|4更新时间：2025-07-16
- 摘要：Access control is one of the powerful and generalized approaches of authorization decisions on information resources.Firstly,the environmental state is introduced and the term "action" is defined based on roles,temporal states and environmental states.Actions can be used to capture security-relevant aspects of roles,temporal states and environmental states in different information systems.Then,the action hierarchy,temporal hierarchy,environmental hierarchy and Action-Based Access Control(ABAC)model are presented.And the relationship among roles,temporal states and environmental states are analyzed.By introducing the limited temporal states and environmental states,the administrative action and administrative model for ABAC are described.The controlling relations of user-administrative action and administrative action-administrative permission are proposed.By Z-notation,the functions of AddAction,ModifyAction and DeleteAction are introduced.Moreover,the related methods for ABAC administrative model are presented.Compared with the existing models,the ABAC model can solve the problem of access control in information systems with mobile computation.关键词：access control;action;environmental state;temporal state;administrative action2|2140|21更新时间：2025-07-16
- 摘要：This paper investigates the power allocation schemes for MIMO systems.An effective power allocation method for ZF/MMSE detected MIMO systems is then proposed.The method is designed to minimize the overall systems BER performance without pre-diagnalizing the MIMO channels using precoding.Compared with conventional power allocation schemes using SVD,the proposed method reduces the required feedback information.Simulation results show that this method effectively improves the BER performance.Moreover,the performance of this new method is also close to that of conventional precoded MIMO systems.关键词：multiple input and multiple output(MIMO);adaptive power allocation;minimum mean square error(MMSE) detection;minimum bit error rate(BER)2|1313|1更新时间：2025-07-16
- 摘要：This paper provides a novel finite state based network service model,which takes the finite state mobile agent (FS-Agent) as the fundamental service unit.In this model,the service content is described by a service content finite state machine (Content-FS),and the service computing process is depicted by a service computation model,which is defined as a mobile agent computation model based on finite state (MACM-FS).Therefore we construct a content-based service model prior to those based on traditional techniques.The experiment results demonstrate that the model is more scalable and effective.2|671|0更新时间：2025-07-16
- 摘要：Geographic routing is widely used in wireless sensor networks due to its great efficiency,low routing overhead and good scalability.However,the problem that most of the geographic routing algorithms which adopt greedy algorithm as their basic routing strategies have to face is the 'routing void phenomena’.Aiming at this problem,this paper presents a new geographic routing algorithm,Greedy algorithm based on the geographic information of 2-hop neighbors (Greedy-2).Greedy-2 algorithm makes nodes be aware of the existence of voids before the packet reaches a region where the Greedy forwarding fails,so that the packet can bypass the dead-end node ahead of time to reduce the probability of encountering the routing voids.PATN,a Planarization Algorithm based on Two-hop Neighbors,is also introduced.PATN ensures the success of perimeter routing through the planarization without extra overhead,and guarantees delivery in UDG networks when Greedy-2 algorithm fails.Extensive simulation further shows that Greedy-2 algorithm can significantly decrease the routing void phenomena.It obtains better performance than Greedy algorithm based on 1-hop neighbors in aspects of the packet delivery rate and the length of routing path.GPSR-2,which combines Greedy-2 and PATN algorithms,has less average length of routing path than GPSR.关键词：Wireless sensor networks;geographic routing;greedy algorithm;information of 2-hop neighbors;routing void;planarization2|1540|14更新时间：2025-07-16
- 摘要：The affine invariance is a challenging problem in pattern recognition.This paper proposes a new method of achieving affine invariance based on global features.Originating from the mathematical model of affine transform,the algorithm converts the coordinates of images from Cartesian plane to polar plane based on the invariance of centroid of images in the affine transform.Using log transform and Radon transform,anisotropy scale transform and rotation transform are converted to shift transform respectively.At last the stationary wavelet transform is exploited to extract the shift-invariant features of images.Thus affine invariant features of images can be obtained.The algorithm is applied to the affine texture classification.Experimental results show a good performance.关键词：affine invariance;centroid of image;log transform;Radon transform;wavelet transform;texture classification2|1694|5更新时间：2025-07-16
- 摘要：Traditional Internet was originally designed for statically located terminals and can hardly meet the new requirements of wireless/mobile networks.This paper proposes a candidate for the mobility management scheme in future Internet,named Identifiers Separating and Mapping Scheme (ISMS),discusses its basic theory and detailed approaches,and compares it with Mobile IPv6.ISMS is a network-based mobility management scheme which deploys location management and handover management inside of the network.It is also designed to satisfy the needs of faster handover,route optimism,scalability,controllability,location privacy,security and decreasing consumption on wireless links.Analysis shows that the average handoff delay of ISMS is far smaller than that of Mobile IPv6 and can satisfy most of the real-time applications.Experiments performed on a prototype show that ISMS is feasible and effective.关键词：future Internet;mobility management;ISMS;Mobile IPv6;universal network2|984|3更新时间：2025-07-16
- 摘要：A cross-layered time-frequency scheduling and resource allocation algorithm,CLSA,is proposed for downlink in OFDMA systems.The CLSA aims at improving system throughput and outage.Besides,some other QoS metrics were considered too,such as physical channel state information as well as users’requirements on throughput,delay and packet error rate (PER).The performance of CLSA and related analysis were evaluated by amounts of simulations.Compared with the classic algorithms,the Modified Proportional Fair (MPF) algorithm and the Modified Largest Weighted Delay First (M-LWDF) algorithm,CLSA shows excellent performance in system effective throughput and outage of OFDMA system in simulations.关键词：OFDMA;resource allocation;scheduling algorithms;cross-layer;performance2|940|3更新时间：2025-07-16
- 摘要：Wireless sensor networks (WSNs) are energy-constrained in natured,moreover,sensor nodes play the dual role of data originator and data relaying.In this paper,a novel method how to allocate the power of sensor nodes for forwarding traffic of other nodes was proposed.After forwarding power ratios of nodes are decided,we consider pricing as a mean to stimulate cooperation between a node and other nodes along its routing path to a sink node.By formulating the problem of data sensing and transport in WSNs as network utility maximization (NUM) problem,an iterative price and joint power control and rate adaptation algorithm was presented by using dual decomposition techniques.Numerical results show that the proposed price mechanism can improve system performance while reducing power consumption.关键词：sensor networks;network utility maximization;power control;dual decomposition2|932|5更新时间：2025-07-16
- 摘要：In this paper,an iterative asymptotic unbiased heteroscedastic variance estimation method,suitable for the measurement noise with arbitrary possibility distributions,is presented.The method can estimate the variances of several different measurement noises at the same time.Unlike traditional heteroscedastic variances estimation algorithms,the proposed iterative estimation method can capture and track the vary variances of the measurement noises with less computation while its estimation accuracy is kept.Its application results on multisensor data fusion show that the presented algorithm is advantageous to the estimation stability,computation simplicity,and good robustness.Both the simulation and experiment results verify the effectiveness of the proposed method.关键词：iterative heteroscedastic variances estimation;minimum mean square error (MMSE);multisensor data fusion;weighted least square2|900|1更新时间：2025-07-16
- 摘要：To enhance the performance of opportunistic cooperative relaying systems,this paper proposes the power allocation algorithms aiming at minimizing the outage probability.The optimization model of the system is constructed and proved to be a convex optimization problem.Then the optimal power allocation algorithm and its operation steps are presented.Furthermore a simple and effective near-optimal power allocation strategy is developed,which only depends on the average channel gains of the relays and thus incurs little overhead.Simulation and numerical results show that significant performance gains can be achieved by the two proposed power allocation algorithms.关键词：cooperative communications;wireless relaying;power allocation;convex optimization2|969|11更新时间：2025-07-16
- 摘要：The replica creation technology of Grid can not replicate Grid Services which are with state and include software and hardware requirements,while only replicate datum and file resources which are no state.Aiming at resolving the question such as accessing bottleneck,load balance of Grid Service,we advise a replica creation approach of Grid Service with state based on Virtual Workshop called Ragsres.Ragsres implements the replication of software and hardware environment using customized trait and well executing separation attribute of Virtual Workshop.It accomplishes the replication of Grid service memory state based the snapshot of Virtual Machine Monitor.The approach realizes the replication of resources with state,which adopting modeling technology of Web service.关键词：grid service;virtual workshop;virtual machine monitor;replica creation4|837|0更新时间：2025-07-16
- 摘要：Allocation order is the best for locality,which slide mark compact algorithm is based on.But traditional design made the algorithm's overhead too large.We proposed a fast slide mark compact algorithm,which reduces the overhead by mark bit table,live block pool and offset table.The results show that it achieves up to 8.9% speedup in industry-standard benchmark SPEC JVM98 on the Pentium 4,11% improvement in dtlb miss numbers and 13.6% reduce with L2 cache miss numbers.关键词：garbage collection;mark compact;mark bit table;live block pool;offset table2|809|1更新时间：2025-07-16
- 摘要：A new design method for families of sequences with large linear span,low cross correlation and large sequences number is presented.The key idea of the new design is to use the analytical method of shift sequences to improve phase-controlled sequences in theory and use interleaved sequences to be basic sequences instead of the original sequences with the two-level autocorrelation function to construct a set of long sequences with the desire properties.The correlation property has also been analyzed,and the maximal correlation value is optimal with respect to the Welch bound.The linear span,the number of families and the number of sequences in each family of the new sequence families are all larger than that of any other sequence families,and some new sequences are balanced.关键词：interleaved sequences;phase-controlled sequences;linear span;correlation value2|646|1更新时间：2025-07-16
- 摘要：In a (t,n) threshold signature scheme,any sub set comprising at least t members is capable of signing any message,and incapable otherwise.The focuses of this paper are to propose a ID-based (t,n) threshold signature scheme without random oracle based on Paterson’s signature scheme which is also without random oracle,and to analyze the validity and the security of the scheme as well.An important feature of our scheme,in which partial signatures can be expediently generated by participants under the discrete logarithm problem and any pubic verifier can check the validity of partial signatures and threshold signatures,is that any attacker,however,cannot obtain system secret value through the public information or by eavesdropping some partial signatures and threshold signatures,and neither can he forge partial signatures.Given the knowledge of all the participants’ secret values,a threshold signature cannot be forged.This method is secure in various possible attacks.关键词：identity-based threshold signature;distributed key generation protocol;bilinear pairing2|657|0更新时间：2025-07-16
- 摘要：We propose a novel bio-inspired algorithm to enhance the color image under low or non-uniform lighting conditions that models global and local adaptation of the human visual system.The proposed method consists of three parts:a preliminary global luminance adjustment followed by local contrast enhancement and color restoration.The global luminance adjustment increases the luminance of darker pixels and compresses the dynamic range as well.The local contrast enhancement adjusts the intensity of each pixel based on its relative magnitude with respect to the bilateral filter output of its neighboring pixels.Then a linear color restoration process is applied to convert the enhanced intensity image back to a color image.Experimental results of the proposed method and reference are compared and analyzed to illustrate the effectiveness of the proposed method.关键词：color image enhancement;human visual system;Retinex;bilateral filter2|2052|30更新时间：2025-07-16
- 摘要：An image attribute,principal phase congruency(PPC)is defined and used to register medical images.Phase congruency is computed on different scale and orientation.Principal phase congruency can be developed from a fusion of the phase congruency by using principal component analysis.A fuzzy similarity measure is chosen as the registration function.We evaluate the effectiveness of the proposed approach by applying it to the simulated and real brain image data.Experimental results indicate that the function is less sensitive to low sampling resolution and noise,do not contain incorrect global maxima that are sometimes found in the traditional algorithm.关键词：image registration;phase congruency;principal component analysis;principal phase congruency;close-degree2|2204|17更新时间：2025-07-16
- 摘要：Remote sensing image is degraded by many factors,such as noise,blur and alias.A restoration of reciprocal cell is adopted to reduce alias of the single frame,which is based on geometrical characteristics of sensor.The restoration transform image into frequency domain.The superposition part of the frequency is deleted in order to dealias around the grids.And restoration of inverse filter is used to deblur and reduce the colour noise.Finally,method of the complex wavelet is combined to reduce the white noise.The reason is that the complex wavelet has property of the direction selecting.The test results indicate that the proposed restoration is more better than other conventional restorations.This restoration is fit to guiding practical projects on account of dealiasing.关键词：aliasing;remote sensing image;restoration;complex wavelet;reciprocal cell;colour noise2|1011|1更新时间：2025-07-16
- 摘要：A measurement for stepwise diversity evaluation of solutions in multi-objective evolutionary algorithm was proposed.In this method,a coordinate based on angle was defined,which can avoid the influence caused by different extent of convergence in diversity evaluation.Furthermore,considering the symmetry of uniformly distributed solutions,the whole objective space was divided and subdivided into different symmetric regions for evaluation.Experiments show that the method can evaluate diversity of solutions accurately.关键词：multi-objective evolutionary algorithm;diversity metric;stepwise evaluation2|954|10更新时间：2025-07-16
- 摘要：The paper presented the concept of KSAC (Kernel Spectral Angel Cosine) to address the restrictions that the classification precision of hyperspectral imagery is very sensitive to segmentation threshold based on SAC (Spectral Angel Cosine).First,we defined the representation of KSAC,and then analyzed the effect of polynomial kernel-function parameter on KSAC,at last,we presented the method of spatial neighboring clustering based on KSAC.The experiments on the hyperspectral imagery of Shenzhen Red-forest field indicate that the threshold area coverage of the spatial neighboring clustering based on KSAC is extended up to nine times of that based on SAC.关键词：hyperspectral;spectral angel cosine;kernel function;spatial neighboring clustering2|1487|12更新时间：2025-07-16
- 摘要：Data storage and access in wireless sensor networks(WSNs),broadly referred as to data management,specifies how data is stored and how queries are disseminated to acquire the relevant data,which has become an import research issue of WSNs.From the perspective of data-centric network,this paper surveys the state of the art techniques of data storage and access in WSNs.First,the basic concepts of data storage and access in WSNs are introduced,then data storage strategies are summarized,and distributed data storage and information brokerage techniques are discussed in detail.Following that,query processing methods are presented,including query categorization,query processing models and optimization techniques.Finally,we conclude the paper and highlight the future development of storage and access techniques of WSNs.关键词：Wireless sensor networks;data storage;data access;information brokerage;query processing2|1397|15更新时间：2025-07-16
- 摘要：Trust plays an important role in the development and implementation of e-commerce systems.This survey gives an overview of existing trust research related to e-commerce systems,and presents some basic frameworks and methods of trust computing.Different types of trust models are presented and some influential examples of trust management systems are described.We also analyze and compare these models afterwards.In the end,the features and qualities of trust management models are concluded.关键词：trust;reputation;policy;web of trust;E-commerce2|1691|15更新时间：2025-07-16
- 摘要：K-anonymization of tables is a method to prevent private information from disclosure prior to publication,which is achieved traditionally via generalization/suppression techniques.However,these methods have some defects on efficiency,availability,etc.Recently,microaggregation algorithm is proposed as an alternative to generalization/suppression method for k-anonymization whose goal is to cluster a set of records into groups of size at least k such that groups are as homogeneous as possible.Then the records’attribute values in the same group are replaced by the group’s centroid.Microaggregation algorithms’core ideas,the state-of-the-art and related techniques are surveyed.The existing algorithms are classified and analyzed.Evaluation methods of microaggregation algorithms are investigated.Finally,some open problems and the research directions in this area are discussed.关键词：k-anonymization;generalization/suppression;microdata;microaggregation;privacy preservation2|1869|25更新时间：2025-07-16
- 摘要：This paper presents the general formalizations of a Digital RF charging sampling mixer in theory,and a mixed-signal modeling method based on Verilog-AMS language and circuit-based macro models in SpectreRF.Using the method,a mixed-signal model of the multi-tap direct sampling mixer is constructed and simulated.In order to use RF-oriented algorithms in SpectreRF,the paper presents a new structure based on frequency dividers,decimators and phase adjustment units to solve the hidden-state problem when constructing the digital control unit using Verilog-AMS language.关键词：digital RF;charge sampling mixer;mixed-signal;modeling;Verilog-AMS;spectreRF2|1292|0更新时间：2025-07-16
- 摘要：Streaming media services have characteristics of real-time,continuity and large bandwidth consumption.These put a higher requirement on networks.An access network is an important part of internet and has significant effects on the service quality of streaming media.The test run on the China's High Performance Broadband Information Network has validated that the large-scale converging access network can effectively support streaming media under some situations.However,due to some restrictions,the test run can not validated the efficiency under the situations when large-scale users simultaneously access media servers.But the validations can be achieved in simulation.In this paper,we compare distributed VoD systems on different access networks by simulation.The results show that when the access router has no congestions,the VoD system on the converging access network has better performance in terms of end-to-end delay and jitter at the same hardware cost.关键词：large-scale converging;access network;video on demand(VoD);distributed service;simulation2|910|1更新时间：2025-07-16
- 摘要：A location method aiming at suppressing NLOS errors in cellular networks using single observer is proposed,which is named by pseudo-target dynamic feasible region constraint method.The method needs less resource and cost than traditional multi-base-stations location methods.The scatters around the target are regarded as pseudo-targets.AOA and the changing rate of AOA of pseudo-targets are measured to get the location of pseudo-targets.Then the feasible region of real target is constructed according to the location of pseudo-targets and the geometrical relationship between real targets and pseudo-targets,in which the optimization methods are applied to estimate the location of real target and deal with the NLOS errors.Pseudo-target dynamic feasible region constraint method converts multi-path signals,usually regarded as harmful factors,to advantage factors.As proved in simulation experiment,the proposed method can depress the location errors effectively and rapidly.关键词：NLOS;AOA;changing rate of AOA;feasible region;optimization processing4|936|3更新时间：2025-07-16
- 摘要：A novel algorithm for adaptive reduced-complexity blind maximum likelihood sequence estimation (MLSE) is proposed.Basic idea behind the proposed algorithm is the principle of per-survivor processing (PSP) and the adaptive selection of survivor path.The key feature of the proposed algorithm is that the minimum Euclidean distance in the trellis can adaptively be estimated,and then only a small number of the most likely survivors in the trellis are retained and utilized for joint channel and data estimation.Theoretical analysis and computer simulation results show that,for channels with severe intersymbol interference (ISI),the proposed algorithm has higher performance in symbol error rate and lower computational complexity at high signal-to-noise ratios (SNR).关键词：per-survivor processing;reduced-complexity;blind maximum likelihood sequence estimation2|1071|2更新时间：2025-07-16
- 摘要：Divisor scalar multiplication is the key operation in hyperelliptic curve cryptosystem.Based on the idea of simple divisor scalar multiplications,Duursma and Sakurai's algorithm for divisor scalar multiplications on a special class of hyperelliptic curves over prime fields has been improved to a larger class of such hyperelliptic curves over prime-extension fields,and two new formulized algorithms for divisor scalar multiplications are proposed.Compared with binary method,our algorithms are much more efficient and take at least 12% less computation amount.关键词：hyperelliptic curve;hyperelliptic curve cryptosystems;simple divisor;divisor scalar multiplication;algorithm2|894|1更新时间：2025-07-16
- 摘要：In 2003,Gentry proposed a certificate-based public-key encryption (CBE) scheme.In CBE scheme,a third part signs a certification on an applicant’s public key or identity and sends the certification to the applicant,the applicant saves it and uses it as a partial private key (decryption key).A receiver needs the certification from the third party and his own public-private keys to decrypt a ciphertext,so CBE scheme combines the best aspects of identity-based encryption (implicit certification) and public-key encryption (no key escrow).We present an efficient and tight certificate-based public-key hybrid encryption scheme,which can be proved satisfying adaptive chosen ciphertext attack security without random oracle.关键词：public-key encryption;certificate-based encryption;without random oracle model2|1317|1更新时间：2025-07-16
- 摘要：Constructing national information assurance evaluation indicator system will provide the security status of national information infrastructure and system for our decider.This paper talked about the situation of TV and radio information assurance evaluation indicator system.The construction of the indicator and method of evaluation were also introduced.According to the specialist’s decision,the application of fuzzy analytic hierarchy process to decide the weighting of indicator was discussed deeply.It also gives an example of this kind of application in this paper.关键词：TV and radio information assurance system;indicator of evaluation system;fuzzy analytic hierarchy;capacity of information assurance2|1036|10更新时间：2025-07-16
- 摘要：In the analysis of optical imaging of functional brain,the traditional difference image(DI) method can not remove the vascular artifact effectively due to the existence of low frequency vibration and the wrong parameters set.In order to resolve this problem,we first study the distribution of the 0.1Hz low frequency vibration in the brain,then according to the vibration characteristic,present a new low frequency vibration difference image(LFVDI) method.The LFVDI method gets the differential maps with the help of the low frequency vibration characteristic,so it can remove the vascular artifact sharply,Compared to the DI method,the LFVDI method increases the detection performance and robustness greatly.Further,in our study,we find though in the high SNR,the DI and LFVDI methods can not detect the activity maps accurately because of the impact of phase of 0.1Hz low frequency vibration and the incorrect parameters set.So in this circumstance,we design a select strategy for the pix time series,and using this select strategy,the nonparametric temporal decorrelation source separation(TDSEP) algorithm is introduced into the optical imaging of functional brain successfully,the simulation results show that the detection performance can be improved greatly.关键词：optical imaging;low frequency vibration;temporal decorrelation2|741|0更新时间：2025-07-16
- 摘要：Classical vector subspace learning algorithms work with vectorized representations of data manifold,while data manifold represented in the reality is intrinsically a tensor,so the algorithms based on tensor subspace learnig can perfectly detect the intrinsic geometrical structure of the data manifold.In this paper,a novel tensor subspace learning algorithm,tensor locality discriminant projection,is proposed.To implement the algorithm,construct within-class and between-class graph at first,then preserve local structure of the data manifold and utilize its discriminant information to deduce the formula of the algorithm,finally work out optimal tensor subspace by iteratively computing the generalized eigenvectors.The experiments on the standard face database demonstrate the effectiveness of the proposed algorithm.关键词：face recognition;tensor locality discriminant projection;dimensionality reduction;manifold learning2|929|2更新时间：2025-07-16
- 摘要：In order to obtain bio-impedance information in different frequency simultaneously,the bio-impedance measurement method in the condition of mixing frequency excitation is studied in this paper.The influence of energy leakage and fence effect of DFT to sine signal detection is analyzed,according to which the bio-impedance measurement technology based on DFT with virtual preference vector is presented.Finally,the compensation of virtual preference vector is certificated by the emulations and experiments.From the experimental results,the dynamic reaction of respiratory and sphygmus in different frequency can be manifested according to the human impedance measurement.关键词：impedance measurement;mixing frequency excitation;discrete fourier transform demodulation;virtual preference vector;dynamic information detection4|624|0更新时间：2025-07-16
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