最新刊期
卷 32 ， 期 8 ， 2004
- 摘要：A new combinational equivalence checking approach integrating Binary Decision Diagrams and Boolean Satisfiability is proposed.The algorithm works on the representation called And/Inverter Graph of the circuit.The BDD propogation and Circuit-based SAT Solver are applied in an intertwined manner to reduce the space of the miter circuit. If failed,CNF-based SAT Solver is used to solve the problem.The efficiency of the proposed approach is shown through its application on the LGsynth91 benchmark circuits.关键词：equivalence checking;AIG;isolated vertex;BDD;SAT solver2|1275|6更新时间：2025-07-16
- 摘要：A video watermarking which resists affine transformations is proposed.A template along the time axis is inserted in each Watermark Minimum Segment (WMS) of the video sequence.Experimental results show that the watermark information can be detected blindly in watermarked frames subjected to reasonable affine transformations.关键词：copyright protection;video watermarking;multimedia;affine transformation2|914|1更新时间：2025-07-16
- 摘要：A strengthened signal Optimal Algorithm with Adaptive Orthogonal Jammer Constraint (OAAOJC) is proposed,which can be used in the anti-jamming of the the Navigation Receivers of Two Satellites.This algorithm eliminates the jammers and receives two satellite signals through determining the Orthogonal Jammer Subspace(OJS) and the quiescent weight vector(the weight vector under the condition of no jammers) and projecting the quiescent weight vector onto OJS.To calculate the quiescent weight vector,the strengthened signal optimal algorithm with equal SNR is presented,which can make the CRPA with small diameter from two beams in directions of the two satellites in condition of no jammer.In order to obtain OJS,the MUSIC algorithm is introduced and the threshold which is used to distinguish the jammer subspace and OJS is given through analyzing the effect of the sampling number and the CRPA 's inconsistency on the perturbation of the minimum eigenvalue.This algorithm is characterized by stable voltage output,microsecond level update ratio of the weight vector and large jammer-eliminating-ratio with certain gains for satellite signals.2|1219|1更新时间：2025-07-16
- 摘要：A dynamic multicast routing algorithm with inaccurate information satisfying multiple QoS constraints named DMIQ has been proposed.DMIQ uses modified BF algorithm as path search algorithm,WFQ as scheduling mechanism,and it can build a multicast tree with the least hops and costs after satisfying bandwidth,delay,delay jitter and loss constraints while link delays are inaccurate and uniformly distributed.The simulation results show that DMIQ has better performances than the multicast routing algorithms that does not satisfy any QoS.关键词：inaccurate;dynamic multicast routing;QoS;DMIQ;BF algorithm2|957|5更新时间：2025-07-16
- 摘要：Location management or mobility management is a challenging topic in mobile computing environment.HLR (Home Location Register) and VLR (Visitor Location Register) are currently used in some Personal Communication networks (PCN),such as GSM and IS-41,in many countries to support location management.In these networks, the basic location management scheme,called the basic HLR/VLR scheme below,updates the HLR whenever a mobile crosses the boundary of an LA (Location Area) regardless of whether the updating is necessary.As a result,this scheme produces enormous location updating cost,wastes substantial networks' resources,and reduces networks' performances.A ring search scheme with a threshold,where HLR is not updated until the number of LA rings crossed by a mobile reaches the threshold,an integer,is proposed to decrease the location updating cost.Both the probabilities of a mobile residing in LA rings and the number of LA rings crossed by the mobile between two successive call arrivals in the proposed scheme are derived on the assumption that the incoming calls to the mobile form a Poisson process and that the time of the mobile residing in each LA is a general distributed random variable.Besides,the conditions on which the proposed scheme outperforms the basic HLR/VLR scheme are given.关键词：location management;mobility management;personal communication networks (PCN);vector markov process2|790|0更新时间：2025-07-16
- 摘要：By the optimization of combined structure,a 40V hybrid super-capacitor was developed.Compared with electrochemical capacitors,the working voltage of the hybrid super-capacitor gets raising actually.According to the electric performance test,it shows that the capacitor has the high energy density and the ability of quick charging and discharging.And Electrical Impedance Spectroscopy (EIS) curves indicate that it has good characteristics of impedance and frequency.关键词：electrochemical;super-capacitor;specific capacitance;impedance performance2|1177|8更新时间：2025-07-16
- 摘要：For control circuits and random logic,signal complexity evaluated by information entropy (or informational energy) had been calculated to estimate the power consumption of circuits in the past research in the high-level abstract step of VLSI design flow.This paper improved the estimation accuracy for power and area costs of combinational circuits at the behavioral design level,with transition information entropy.Lots of experiments had been implemented to prove the improved estimation accuracy compared to the traditional analytic method.The experimental results with BENCHMARK circuits show that relative errors of area and power estimation have been reduced 24.3% (12.74% to 9.65%) and 15.4% (13.67% to 11.57%).关键词：combinational circuit;low power;information entropy2|913|0更新时间：2025-07-16
- 摘要：The photo-bidirectional negative resistance transistor (PBNRT) is a novel "S" type photoelectric negative resistance device.Its photoelectric negative resistance characteristics were investigated both by experiment and numerical simulation and its equivalent circuit is proposed.PBNRT has photo-controlled current switching effect in the optical and electric mixed operating mode,and its "S" negative resistance characteristics can be modulated by two different controlled ways,using light and controlled voltage respectively.The simulated and experimental results both indicate that on increasing optical intensity,sustaining voltage almost remains unchanged and snapback voltage decreases,thus reducing the negative resistance voltage range; while as controlled voltage increases,sustaining voltage and snapback voltage both increase accordingly,and output negative resistance characteristic curve shifts right.All the properties mentioned above make it suitable for photoelectric switching,photo-controlled oscillation and photoelectric detector.关键词：PBNRT;S type photoelectric negative resistance;photo-controlled current switching;numerical simulation2|846|0更新时间：2025-07-16
- 摘要：This paper develops a data fusion algorithm of multisensor dynamic system based on filtering step by step.In distributed multisensor dynamic system when all of the observations aiming at the target are obtained,fistly we can predict the object state based on previous system information at this point and then use Kalman filtering and all of local observations to update the estimate value of object state in turn.Accordingly we can get a global fusion estimate value of object state based on the global information at that point.It presents the material form of this new algorithm and compares complexity of algorithm with traditional centralized data fusion algorithm.The computer simulation indicates that this algorithm possesses uniform estimate accuracy aiming at the object state with traditional centralized data fusion algorithm.关键词：multisensor system;data fusion;filtering step by step;Kalman filtering2|1258|21更新时间：2025-07-16
- 摘要：Cluster analysis aims at answering two main questions:how many clusters there are in the data set and where they are located.Usually,the traditional clustering algorithms only focus on the last problem.In order to solve the two problems at the same time,this paper proposes a novel dynamic clustering algorithm called DCBIG,which is based on the immune network and genetic algorithm.The algorithm includes two phases,begins by running immune network algorithm to find a feasible solution,and then employs genetic algorithm to search the optimum number of clusters and the location of each cluster according to the feasible solution.Also,the probabilities and the conditions to acquire a feasible solution through immune network algorithm are discussed in this paper.Experimental results show that new algorithm is characterized by higher convergent probability and convergent speed.关键词：dynamic clustering;immune network;clustering feasible solution;convergence2|1302|14更新时间：2025-07-16
- 摘要：On analysis of online and offline handwritten Chinese character recognition system,a video-based Online Handwritten Chinese Character Recognition Method is proposed.Through a video camera,the handwriting on the standard paper is captured in real time.The handwritten Chinese characters are extracted by applying image processing technique,and recognized online.We present a fast pentip matching algorithm and a mathematical morphology based handwritten Chinese character extraction approach.The experimental results show the efficacy of the proposed approach.关键词：handwritten Chinese character recognition;video image;mathematical morphology2|845|0更新时间：2025-07-16
- 摘要：Fast routing lookups are crucial for the forwarding performance of IP routers.Longest prefix match makes routing lookups difficult.This paper proposes a parallel routing lookup system that applies a method to partition a routing table.The method can divide all prefixes in a routing table into several prefix sets where prefixes don't overlap.Based on the method,this paper also presents a common parallel lookup framework that reduces "longest prefix matching" in all the prefixes to "only prefix matching" in several prefix sets.The framework can effectively simplify the design of lookup algorithms and improve lookup performance.The framework is suitable for most lookup algorithms.For simple binary search algorithm,our system can reach log2(2N/B) lookup complexity (where N is prefix number in a routing table and B is an integer bigger than 4).Also,the system can be scaled to IPv6 easily.关键词：longest prefix match;binary search;routing lookup;routing update2|880|3更新时间：2025-07-16
- 摘要：In dealing with continuous Chinese speech,this paper proposes a novel method (RBFOBSQ),using Radial Basis Function Neural Networks (RBFNNs),for output-based objective speech quality assessment.First the characteristics of speech signals at the output of the speech system were extracted by Mel cepstrum coefficients.Then the mapping from the characteristics to the Mean Opinion Score (MOS) was accomplished by the RBFNNs,and the average value of the RBFNNs' outputs was the result of output-based objective speech quality.The experimental results show that the correlation degree reaches more than 0.92 when using the train samples and attains more than 0.88 when using the test samples.关键词：RBF neural networks;Mel cepstrum;speech quality objective assessment2|2|3更新时间：2025-07-16
- 摘要：Instruction cache consumes a large portion of power in processor.By using this method the number of accesses to both tag and data array of set-associative instruction cache can be significantly reduced.The method takes advantage of the fact that tag can be accessed once per line during sequential execution.And in the idle cycles of the tag memory,the next cache line can be pre-visited so that the cache-hit and way-select information can be obtained ahead of time.This information can be used to chip-deselect the missed data array later.Also way prediction mechanism can be utilized in tag pre-visiting scheme to further reduce the number of accesses to the tag array without performance penalty.A way-select circular history buffer (CHB) is maintained to record way-select information of a cache line.Short branches within the address range of the CHB will not require accessing to the tag array and missed data array.This method has been implemented in a 250 MHz high-performance low-power RISC processor.关键词：cache;low power;CPU;microarchitecture2|1033|4更新时间：2025-07-16
- 摘要：UML collaboration diagrams represent the structure relationship and interactive behavior of the objects involving in a collaboration of the software system,whether they are correctly implemented or not could be validated by integration testing.An approach is proposed to generate integration test cases based on UML collaboration diagrams.It takes a collaboration diagram as the test model,it identifies all the scenario paths in the diagram which represents use case realization by traversing the direct successors of each message.It selects and traverses each scenario path to get the method call sequence,path condition and parameters.It applies category partition method to generate rational combination of input parameters,environmental conditions,as well as the corresponding output and method call sequence,to form a test case for each scenario path.This method,combines white-box and black-box test method to generate fewer test cases to test the gray-box behavior,as well as to cover all the integration requirements.关键词：test cases generation;integration testing;UML collaboration diagram;scenario path2|2012|7更新时间：2025-07-16
- 摘要：Routing is a challenge task in the mobile Ad Hoc network because its topology changes dynamically for its nodes' movement.At present,most Ad Hoc routing algorithms are of single path.However,more attention has been paid to multipath recently for it can support QoS better.The problem in multipath routing is that it is much more difficult to find multiple node-disjoint paths because of the lack of an accurate network topology.This paper proposes an aggregated multipath routing algorithm(AMR) for mobile Ad Hoc networks based on the maximum-flow method,as an extension to the single path routing algorithm(DSR).This algorithm can find the node-disjoint paths effectively,improve the packet delivery performance greatly and edecrease the network congestion.THe results show that compared with DSR,AMR is able to improve packet delivery ratio by about 20%-60% and reduce average delay by about 40%-60%.关键词：Ad Hoc routing;multipath routing;AMR;maximum-flom2|1659|9更新时间：2025-07-16
- 摘要：The grain growth and crystallographic orientation of the ULSI Cu interconnects within the Dmascene architecture were observed.Microstructures of the Cu interconnect depending on linewidths and anneal temperatures and impacts on the electromigration (EM) were analyzed.The grain size of Cu lines shrinked as the linewidth was reduced.The small grains and the weaker (111) texture in Cu lines were formed compared with that in Cu blanket films.The EM resistance of the Cu metallization could be improved via the grain growth and the (111) texture developed during anneal at 300℃ for 30min.The results indicate that the Cu diffusion involves interface diffusion and boundary diffusion, while the diffusion along interface plays a dominant role in EM failure for Cu lines with the narrow linewidth.关键词：Cu interconnect;crystalline orientation;grain size;electromigration2|805|1更新时间：2025-07-16
- 摘要：Current scheduling algorithms with multi-priorities need to exchange a large amount of control messages whose transmission time has become the bottleneck for performance improvement of scheduling algorithms.To improve scheduling performance, we propose a new high-speed crossbar scheduling algorithm p-iDRR which supports multi-priorities.p-iDRR has many good features,such as being easy to implement,fewer control messages,high-speed and scalability.The results of simulation show that p-iDRR can achieve fine performance of throughput and delay and that p-iDRR is suitable to high-speed routers that have high-density ports and large capacity.关键词：high-speed router;input-queueing;scheduling algorithm with multi-priorities;p-iDRR;Crossbar2|858|2更新时间：2025-07-16
- 摘要：The filtering performance of polarization sensitive array is investigated theoretically.The desired signal and interference are completely polarized and come from random directions.We obtain the maximal outputting SINR (Signal to Interfere and Noise Ratio),which is mainly related with the spatial matching coefficient and polarizational matching coefficient between signal and interference.Contrasted to the common antenna array with the same hardware equipment,its advantages are mainly embodied by the joint filter ability in polarizational domain and spatial domain.The interference must come from the same direction and with the same polarization as the desired signal to gain the low SINR.Numerical examples and results verify the correctness of theoretical deduction.关键词：polarization sensitive array;filtering;completely polarized;performance analysis2|1346|19更新时间：2025-07-16
- 摘要：An ensemble Monte Carlo simulator,which is developed with the object-oriented programming language C++ and unified modeling language UML,has been introduced in this paper.Using this simulator,we have simulated the local fields on the GaAs surfaces and the temporal waveforms of THz pulses when the GaAs surface is illuminated by intense sub-picosecond optical pulses (the corresponding photogenerated carrier density 1019cm-3)and biased in a high applied external electrical field (100kV/cm).The power spectra show that the higher bias electric field may generate the higher power output within the range of 6THz,and beyond this range the effect of high bias fields is not obvious.关键词：Monte Carlo method;THz radiation;C++;UML;GaAs2|1866|1更新时间：2025-07-16
- 摘要：Plane wave method and a full vector model based on supercell lattice method are applied for modeling photonic crystal fibers.The normalized propagation constant,which determines the number of the modes and mode cutoff is obtained for a PCF:with a certain structure parameters.The cutoff frequency and its asymptotic bound are used to define the boundaries of three operation regime of PCF:which consist of endlessly single-mode,single mode and multimode operation.关键词：photonic crystal fibers;mode;mode cutoff2|988|3更新时间：2025-07-16
- 摘要：A technique fabricating long period fiber gratings (LPFGs) by high-frequency CO2 laser pulses is proposed and demonstrated,for the first time,to our knowledge.In comparison with other fabrication techniques of LPFG,such as using low-frequency CO2 laser and UV laser,such a technique has many unique advantages,including high efficiency,low cost,low insert loss,and repetitive exposal being easy.Exposing area of the fiber is transferred periodically by means of the scan lens turning.Then,it is especially propitious to developing novel LPFGs using the fabrication technique.It is analyzed that the single side incident CO2 laser resulted in an asymmetric refractive-index distribution,within the cross-section of the LPFG.关键词：long period fiber grating;fiber Bragg grating;CO2 laser;high-frequency laser pluses;birefringence2|1015|6更新时间：2025-07-16
- 摘要：In the dynamic electromagnetic environments,a polarization estimator is usually utilized by the adaptive polarization filter to get the knowledge of the polarization of interference fields.The optimal polarization will be then calculated for the use of polarization filtering.In this sense an adaptive polarization filter can be modeled as an open-loop cascade system of a polarization estimator,an optimum polarization calculator and a polarization filter.Theoretical performance of the polarization estimator is analyzed for the case of polarization vector estimation based on the dual-channel orthogonal polarization measurements.It is proved that the polarization estimation error obeys the Rayleigh distribution approximately.By studying the transmission process of the estimation error in a polarization filter,a series of analytic formulae on the performances of adaptive polarization filters are derived,which stochastically reveal the relationship between the filtering performance and such factors as the signal-to-noise ratio clearly.关键词：radar;polarization;estimation;polarization filter;adaptive2|1461|21更新时间：2025-07-16
- 摘要：Based on the analysis of the switch time in the traditional Hysteretic-Current-Loop-Control Boost Type Power-Factor-Correction(PFC)circuit,this paper proposes a simple control mode.To achieve PFC,this mode divides the logical control into two parts,then it determines the prescribed maximum inductor current and the minimum inductor current respectively by constant turn-on time technology and the average inductor current signal.In experimental circuit,a RC low-filter replaces the multiplier and the input voltage sensor of traditional mode and the measurement gets near unit power factor.关键词：power factor correction;hysteretic-current-loop-control;constant turn-on time;average current2|1178|0更新时间：2025-07-16
- 摘要：Denial of service attack is among the hardest network problems.Several countermeasures are proposed for it in the literature,among which,Probabilistic Packet Marking(PPM) first developed by Savage et al is promising and has many variants.In these marking schemes,router marks packets with a probability which is fixed and uniform.Using fixed probability causes that many packets are needed for a victim to reconstruct the attack path(s).In this paper,an adaptive marking scheme is given,which reduces the number of packets needed for attack path reconstruction,thus also saves time for the victim and reduces the ability for attackers to spoof.关键词：traceback;DoS;DDoS;denial of service2|1082|14更新时间：2025-07-16
- 摘要：Intrusion detection (ID) techniques are important to intrusion detection systems (IDS).Based on the ID technique using system call sequences,a new detection technique was put forward that uses a subset of system calls (named W-subset).Experiments show that the new technique has low false positive rate,low storage-cost,high computing efficiency and hence is applicable to real-time intrusion detection.关键词：information security;intrusion detection;anomaly detection;intrusion detection technique;system call3|1103|5更新时间：2025-07-16
- 摘要：The concepts of high attribute dimensional information system and fuzzy logical neuron are firstly proposed,and a kind of new single layer discrete recurrent neural network model with n input and n output is designed.The learning of the weight matrix be done by means of finding weight matrix of equal matrix,and elements of initials weight matrix consist of sparse feature difference degree,so a sparse feature difference degree is given.It can realize dynamic state and effective classification,and the algorithm has important use in high attribute dimensional data mining and clustering analysis.关键词：sparse feature;difference degree;logical recurrent neural network;dynamic state clustering;learning algorithm3|1363|1更新时间：2025-07-16
- 摘要：Test resource partitioning is an efficient method to reduce the test cost.This paper presents a novel and efficient code,i.e.variable-tail code,for test data compression.Theoretical analysis and experimental study show that the variable-tail code can provide the higher compression efficiency than Golomb.It is suitable for different test sets and could provide the high compression ratio.The decoder of the variable-tail code is simple and easy to be implemented.In order to achieve higher compression ratio,an efficient test vectors reordering algorithm (ERA) incorporating a dynamic X-bit assignment procedure is presented.Experimental results demonstrated the efficiency of the proposed code and algorithm.关键词：Variable-Tail code;Golomb code;flexibility;test mode;diagnose mode2|1139|23更新时间：2025-07-16
- 摘要：We introduced agree predictor into UNICORE architecture to evaluate the performance enhancement brought by the configuration of dynamic branch predictor,in order for giving quantitative reference for UNICORE reconstruction.Using system simulator,we synthetized the effect of the prediction scheme and the branch target buffer.The conclusion is useful to the single-issue-pipeline microprocessor design.关键词：instruction set architecture;pipeline;branch prediction2|1644|2更新时间：2025-07-16
- 摘要：Authenticated Dictionary(AD) is one of the important data structures,and it is of great theoretic and applicable value in many research fields.Basic concept and principle of AD were examined.Time constraint was introduced into the model of AD,based on which a new taxonomy of AD was presented.Afterwards,different implementation technologies of AD were given on the base of typical application of ADs in PKI fields.A brief performance analysis and comparison among these certificate revocation schemes based on different ADs were carried out.关键词：authenticated dictionary;certificate revocation;PKI;information security2|817|2更新时间：2025-07-16
- 摘要：Probabilistic diagnosis algorithm is very important in the system level fault diagnosis research.This paper proposes four probabilistic algorithms based on grouping theory and greedy principle for system-level fault diagnosis.By computer simulation,it is shown that these diagnosis algorithms can achieve a high probability of correctness under low time complexity.The greedy algorithm one has the best performance in the four probabilistic algorithms.The results also indicate that our algorithms have better performance than the Compete algorithm and Majority algorithm,which are classic probabilistic algorithms in system level fault diagnosis.关键词：system-level fault diagnosis;probabilistic diagnosis;grouping theory;greedy algorithm2|1104|0更新时间：2025-07-16
- 摘要：A forgery attack is presented on the self-certified signature scheme.The results show that CA can forge a valid self-certified signature of his client on an arbitrary message by tampering with some parameters of the signature.An improved scheme is proposed to resist this kind of forgery attack.Analyses show that the improved scheme has the same security features with Schnorr signature.关键词：digital signature;self-certified signature;forgery attack2|991|1更新时间：2025-07-16
- 摘要：Since current threshold values are easy to control,this paper studies how to realize the threshold controlling in current-mode CMOS circuits.Guided by the switch signal-theory,the operations of current transmission switch used to realize threshold-controlling circuits are established.On this basis,binary and multiple-valued current-mode CMOS adders with threshold-controllable function are designed.A universal design method for current-mode CMOS m-valued adders based on threshold-controllable technique is proposed.By employing the threshold-controlling technique,the construction of the circuits has been simplified considerably,and the performance of the circuits has been improved.HSPICE simulations of transient characteristics using 0.25μm CMOS technology are presented,and the simulated results of energy dissipation are compared.关键词：switch theory;full adder;threshold-controllable technique;current-mode CMOS2|676|7更新时间：2025-07-16
- 摘要：A hybrid MLP/CNN neural network is constructed based on research on time-delayed characteristic of chaotic neuron A misuse detection Model based on chaotic neuron is proposed,which has both the capability of classification which MLP has and the functionality of time-delay,collection and judgment which chaotic neuron has.Because this intrusion detection system has flexible time-delay characteristic,it can identify distributed intrusion effectively.The simulation and test is conducted using samples captured from data traffic.The detection rate of FTP (File Transfer Protocol) brute-force attack is up to 98%.The false alarm and false negative rates are both less than 2%.The model proposed in this paper may be generalized to time-delayed intrusion detection systems such as distributed DOS etc.and other time-delayed classification systems.关键词：misuse intrusion detection;hybrid MLP/CNN neural network;chaotic neuron;time-delay classification2|1214|2更新时间：2025-07-16
- 摘要：Research regarding Digital Forensic Technologies has become more active with the recent increases in illegal accesses to computer system.Many researchers focus only on the techniques or mechanisms for evidence detecting and evidence analyzing,without considering the security of forensic mechanisms themselves,and the digital evidence can't be protected completely.Based on the analysis of relative researches,secure area is proposed to protect forensic mechanisms from attacking.A mechanism called I-LOMAC has been designed and implemented to evaluate this method.The results demonstrate the advantage in protecting the forensic mechanisms.关键词：digital forensics;digital evidences collecting system;access control;integrity;fidelity2|2204|3更新时间：2025-07-16
- 摘要：Intrusion detection systems take an important role in securing Internet applications.The exactness of user behavior profiles directly affects the detection performance of intrusion detection systems because profiles are the criterion of anomaly detection.The exactness of profiles would be reduced with the use of traditional profile creation methods due to uncertainty of user behavior patterns in Internet.We proposes a new intrusion detection scheme based on information visualization,and presents a new CCA(Curvilinear Component Analysis)-based visualization algorithm.This algorithm is better than traditional algorithm in the performance of distance mapping,and can provide more exact visual information for security experts.Visual information of user behavior patterns facilitates security experts to select more suitable cluster analysis algorithms to create more exact behavior profiles.关键词：intrusion detection;anomaly detection;behavior profile creation;information visualization;CCA2|742|0更新时间：2025-07-16
- 摘要：Based on the working principle of the light addressable potentiometric sensors (LAPS) and the diffusion theory about the photo-carrier in a silicon chip,a design of the new LAPS structure was advanced newly,with the measuring cell by front illumination,the quickset of LAPS array chip and the silicon tips array.The photocurrent signal of the new LAPS is five times photocurrent of the LAPS by back illumination.When this sensor was used for determining pH value in buffer solution of pH 4.00,pH 6.86,pH 9.18,the correlation coefficient is 0.9999,the response sensitivity is 50.1mV/pH,the standard deviation and variation coefficient for 4 times performances response to buffer solution of pH 9.18 were found to be 0.57mV and 0.048% respectively.Finally,this paper analyzed and discussed the testing method of three electrodes,feature of the new LAPS and the infections of conductance of waiting testing electrolyte on photocurrent.关键词：LAPS;MEMS;array chip;photocurrent2|1268|1更新时间：2025-07-16
- 摘要：Automated antenna design based on optimization engines and antenna modeling programs has already become the latest trend of antenna design.An antenna automated design software package using Genetic Algorithms coupled with NEC (Numerical electromagnetics code) was introduced.To elevate efficiency of antenna design,a Beowulf parallel computing system was built,and a new proposal,namely non-blocking master-slave parallel Genetic Algorithm,was explored.The principle and methods of automated antenna design based on Parallel Genetic Algorithms was discussed.An example of automatically designing a tapered helix-conical horn antenna by the package was presented.Results show the package has ability to accurately and efficiently design complex antennas,and its parallel efficiency could be maintained at about 82.25% even when up to 16 processors were used,which is higher than corresponding methods.关键词：genetic algorithm;NEC;parallel computation;automated antenna design2|1009|4更新时间：2025-07-16
- 摘要：A 10Gb/s limiting amplifier for SDH STM-64 optical receiver is realized in 0.18μm CMOS technology.A modified Cherry-Hooper architecture is employed to achieve a higher gain-bandwidth product.The measured results demonstrate an input dynamic range of 42dB (3.2mV~500mV) with constant output swing 250mV.The highest bit rate can be achieved is up to 12Gb/s with a small-signal input.The power dissipation is 110mW with the supply voltage of 1.8V.The chip area is 0.7mm×0.9mm.关键词：STM-64;optical receiver;limiting amplifier;Cherry-Hooper architecture;0.18μm CMOS technology2|1269|5更新时间：2025-07-16
- 摘要：The cascade noise model (En-In) and the noise parameters extraction of microwave BJT device were studied.Using the complex correlation theory,the expressions of the noise parameters Fmin,Rn,Γopt were obtained.According to the intrinsic H-parameters and noise source configuration of the two-port device,the En-In model equations are determined.By substituting the En-In equations into the noise parameters expressions,the noise parameters are extracted.The experiments on the two devices AT41410 and AT41411 show that the results extracted are almost in accord with the values measured.关键词：Noise measurement;BJT;En-In Model;complex correlation2|1456|2更新时间：2025-07-16
- 摘要：Synthesize the Carbon/nickel oxide compound aerogel with the raw material resorcin,formaldehyde,nickelnitrate and anhydrous sodium carbonate by sol-gel.It becomes aerogel electrode through supercritical drying from carbon dioxide and subsequent pyrolysis in the inert nitrogen atmosphere at 900℃.This kind of electrode has typical capacitance properties,the specific capacitance is about 263F/g,and the equivalent series Resistance is less than 1Ω by electrochemical testing.The structure topotaxy of the compound materials and its supercapacitor characters have been researched in this paper also.关键词：compound aerogel;supercapacitor;ionistor;nickel oxide2|1456|3更新时间：2025-07-16
- 摘要：Aimed at the MAC design in DSP system with standard CMOS library,this paper presents the idea of constructing the general MAC platform based on the minimal merging of multi-mode multiplications,which can well satisfy all kinds of DSP requirements and improve the efficiency of system.To achieve the perfect match with multi-pipeline DSP architecture,the idea of partition of the platform is also put up.As an example,a 16 bits DSP's MAC platform is illustrated in the paper.It applies the novel methods of Booth encoding combined with partial products generating,forwarding round disposal and selected realization of Wallace-tree adding to its optimization.Through the synthesis of MAC circuit,it validates that the ideas and methods presented in the paper do well to reduce the critical path delay and circuit gates.关键词：MAC;DSP;Booth encoder;Wallace-tree2|928|1更新时间：2025-07-16
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