ISSN 
1997 Vol. 26, No. 5
1997, 26(5): 453-456.
Abstract:
The implementation of an optimum minimum error classifier based on the Hamming neural model is discussed for binary patterns in this paper by the use of current-mode technique.The CMOS implementation of current-mode winner-take all(WTA) circuit and the subnet for calculating matching scores between two patterns are demonstrated.Computer simulations are in agreement with the theory.The classifier mimics well the heavy use of lateral inhibition evident in the biological neural nets.The resulting circuits are simple and particularly suitable for integration with standard VLSI technology,thus will have perspecitve in many application areas.
The implementation of an optimum minimum error classifier based on the Hamming neural model is discussed for binary patterns in this paper by the use of current-mode technique.The CMOS implementation of current-mode winner-take all(WTA) circuit and the subnet for calculating matching scores between two patterns are demonstrated.Computer simulations are in agreement with the theory.The classifier mimics well the heavy use of lateral inhibition evident in the biological neural nets.The resulting circuits are simple and particularly suitable for integration with standard VLSI technology,thus will have perspecitve in many application areas.
1997, 26(5): 457-460.
Abstract:
An opened microstrip circuit is described imploying a three ports electric network in this paper.The errors caused by omiting of electromagnetic radiations of opened microstrip in numerical simulating of microstrip circuits is eliminated successfully by making one circuit port of the radiation.No priori procedure is needed,and the S-parameters of the-three-ports circuit are calculated from a single run of FDTD,which leads to a significant reduction in CPU time.A good agreement is found between the example and the data published,which shows that the definition of three-ports network used to describe the opened microstrip circuit is reasonable and effective.The definition can be widely used in the analysis of unshielded transmission,electromagnetic compatibility,microstrip antenna and CAD of opened transmission line circuits.
An opened microstrip circuit is described imploying a three ports electric network in this paper.The errors caused by omiting of electromagnetic radiations of opened microstrip in numerical simulating of microstrip circuits is eliminated successfully by making one circuit port of the radiation.No priori procedure is needed,and the S-parameters of the-three-ports circuit are calculated from a single run of FDTD,which leads to a significant reduction in CPU time.A good agreement is found between the example and the data published,which shows that the definition of three-ports network used to describe the opened microstrip circuit is reasonable and effective.The definition can be widely used in the analysis of unshielded transmission,electromagnetic compatibility,microstrip antenna and CAD of opened transmission line circuits.
1997, 26(5): 465-467.
Abstract:
Multisensor information fusion refers to any procedure where different sources of sensory data in the integration process are combined into one representational format.Using the concept of confidence distance estimation,the measured errors of sensors are tested and the support relations among sensors are described.Whether the data of sensors are used are decided.One optimal fusion algorithm is presented,which is proved to be effective.
Multisensor information fusion refers to any procedure where different sources of sensory data in the integration process are combined into one representational format.Using the concept of confidence distance estimation,the measured errors of sensors are tested and the support relations among sensors are described.Whether the data of sensors are used are decided.One optimal fusion algorithm is presented,which is proved to be effective.
1997, 26(5): 468-472.
Abstract:
From the context of statistics,this paper derives theoretically the autocorrelation function and autocorrelation coeffcient of one class of chaotic sequences generated via an one-dimensional(1 -D) discrete dynamic system driven by function iterations.The resulting autocorrelations are identical with those of a stochastic first-order autoregressive process.Both have nearly ideal autocorrelation structures which denote that a plenty of PN sequences for communication and radar systems can be applied.Some numerical simulation results are in agreement with those of theoretic analysis.
From the context of statistics,this paper derives theoretically the autocorrelation function and autocorrelation coeffcient of one class of chaotic sequences generated via an one-dimensional(1 -D) discrete dynamic system driven by function iterations.The resulting autocorrelations are identical with those of a stochastic first-order autoregressive process.Both have nearly ideal autocorrelation structures which denote that a plenty of PN sequences for communication and radar systems can be applied.Some numerical simulation results are in agreement with those of theoretic analysis.
1997, 26(5): 473-476.
Abstract:
Fractal image coding in DCT domain is studied in this paper.Then a progressive image transmission sheme is presented.Because of the advantage of the fractal image coding in DCT domain,the progressive image transmission sheme is produced.The sheme has an iterative structure,and at each stage a fraction of the image information is transmitted.From the progressive transmission thought,a lossless image coding method is developed.Finally,the results show that the progressive image transmission sheme and the lossless image coding sheme are practical.
Fractal image coding in DCT domain is studied in this paper.Then a progressive image transmission sheme is presented.Because of the advantage of the fractal image coding in DCT domain,the progressive image transmission sheme is produced.The sheme has an iterative structure,and at each stage a fraction of the image information is transmitted.From the progressive transmission thought,a lossless image coding method is developed.Finally,the results show that the progressive image transmission sheme and the lossless image coding sheme are practical.
1997, 26(5): 477-482.
Abstract:
A new fast RSA algorithm is presented in this paper,which is an improvement of a fast RSA algorithm based on symmetry of modulo multiplication (SMM algorithm).It is shown by theoretical analysis that the proposed algorithm decreases the recursive steps by 17.2% on average.Compared with troditional binary representations (BR algorithm),the new algorithm obtains the speed improvement by about 42% on average.
A new fast RSA algorithm is presented in this paper,which is an improvement of a fast RSA algorithm based on symmetry of modulo multiplication (SMM algorithm).It is shown by theoretical analysis that the proposed algorithm decreases the recursive steps by 17.2% on average.Compared with troditional binary representations (BR algorithm),the new algorithm obtains the speed improvement by about 42% on average.
1997, 26(5): 483-486.
Abstract:
An analytical expression for the relationship between gain and noise figure is derived for the design of the microwave broadband low noise transistor amplifier in this paper.The characteristic of analytical solutions is discussed in detail,which simplifies the empirical design method.The microwave low noise HEMT is also analyzed and the results are in agreement with those gained by empirical method.
An analytical expression for the relationship between gain and noise figure is derived for the design of the microwave broadband low noise transistor amplifier in this paper.The characteristic of analytical solutions is discussed in detail,which simplifies the empirical design method.The microwave low noise HEMT is also analyzed and the results are in agreement with those gained by empirical method.
1997, 26(5): 487-491.
Abstract:
A deep submicrometre MOS device model BSIM2 is analyzed in this paper.Based on the discussion of physical effects of short channel devices,a nMOSFET with channel length 1 μm and gate oxides thick ness 25 nm is measured and its BSIM2 parameters are extracted.The results are analyzed,which show that BSIM2 is one of the important tools for VLSI/ULSI design.
A deep submicrometre MOS device model BSIM2 is analyzed in this paper.Based on the discussion of physical effects of short channel devices,a nMOSFET with channel length 1 μm and gate oxides thick ness 25 nm is measured and its BSIM2 parameters are extracted.The results are analyzed,which show that BSIM2 is one of the important tools for VLSI/ULSI design.
1997, 26(5): 492-495.
Abstract:
The Ta/Al alloy film containing Al 50% at.has an excellent resistive performance.The film is deposited by DC co-sputtering from tantalum cathode,45% of which is covered with area of aluminum discs.The influence of technological parameters such as sputtering pressure,sputtering voltage and heat-treatment conditions etc.on the properties of the film is explored.The results show that the Ta/Al alloy film can be used for stable power resistor or resistive network.
The Ta/Al alloy film containing Al 50% at.has an excellent resistive performance.The film is deposited by DC co-sputtering from tantalum cathode,45% of which is covered with area of aluminum discs.The influence of technological parameters such as sputtering pressure,sputtering voltage and heat-treatment conditions etc.on the properties of the film is explored.The results show that the Ta/Al alloy film can be used for stable power resistor or resistive network.
1997, 26(5): 496-499.
Abstract:
In this paper,the properties of MnCoNi system NTC thermistors doped with Nb2O5 are investigated through X-ray powder diffraction,SEM,and electrical conductivity measurements.Studies of the doped thermistors show that their resistances vs temperature behaviors are similar to those undoped,while their resistivities at 25℃ and their sensitivity indexes are increased and their electrical stability is nearly tripled.
In this paper,the properties of MnCoNi system NTC thermistors doped with Nb2O5 are investigated through X-ray powder diffraction,SEM,and electrical conductivity measurements.Studies of the doped thermistors show that their resistances vs temperature behaviors are similar to those undoped,while their resistivities at 25℃ and their sensitivity indexes are increased and their electrical stability is nearly tripled.
1997, 26(5): 500-503.
Abstract:
In this paper,ZCS(zero current switch) worked in high frequency is studied.The mathematical relationships of every parameter in the switch are given.By analyzing the energy transfer in the switch,the approximate fomula are got to find out the work frequency under a certern condition.Mean while,the characteristics of its application and some restriction of the resonant parameter are discussed.Finally,the measured data of the experiment indicates that the analysis is close to reallity.
In this paper,ZCS(zero current switch) worked in high frequency is studied.The mathematical relationships of every parameter in the switch are given.By analyzing the energy transfer in the switch,the approximate fomula are got to find out the work frequency under a certern condition.Mean while,the characteristics of its application and some restriction of the resonant parameter are discussed.Finally,the measured data of the experiment indicates that the analysis is close to reallity.
1997, 26(5): 511-514.
Abstract:
A new approach,genetic algorithm method for digital circuit automatic test patterns generation is presented in this paper,which defines a characteristic function for each basic gate circuit,converts the test generation problem of circuit under test(CUT) into searching for the optimal solutions of a constrained function,and can make use of the constructional information of CUT.It is possible to obtain high fault coverage for testable single stuck at and multiple faults with the method without fault simulation.
A new approach,genetic algorithm method for digital circuit automatic test patterns generation is presented in this paper,which defines a characteristic function for each basic gate circuit,converts the test generation problem of circuit under test(CUT) into searching for the optimal solutions of a constrained function,and can make use of the constructional information of CUT.It is possible to obtain high fault coverage for testable single stuck at and multiple faults with the method without fault simulation.
1997, 26(5): 515-519.
Abstract:
A feature based dynamic slide match method for recognizing hole's type extracting hole's shape and location parameters from CAD exchange files is propsed.Software System for automatic make NC Program of numercal Control turret Punch Press machine is develeped based on the method.The Software system can generate NC program from CAD exchange files of DXF format or IGES format automatically on Computer.
A feature based dynamic slide match method for recognizing hole's type extracting hole's shape and location parameters from CAD exchange files is propsed.Software System for automatic make NC Program of numercal Control turret Punch Press machine is develeped based on the method.The Software system can generate NC program from CAD exchange files of DXF format or IGES format automatically on Computer.
1997, 26(5): 520-524.
Abstract:
A new method of reducing chattering in sliding mode control is proposed,which considering the chattering as the results of uncertainty in the system mathematic model and using H∞ optimization design of switching surface.Frequency shaping of sliding mode can be achieved and chattering can be reduced well via the method.The effectiveness of the proposed method is verified by the results of digital simulation.
A new method of reducing chattering in sliding mode control is proposed,which considering the chattering as the results of uncertainty in the system mathematic model and using H∞ optimization design of switching surface.Frequency shaping of sliding mode can be achieved and chattering can be reduced well via the method.The effectiveness of the proposed method is verified by the results of digital simulation.
1997, 26(5): 525-528.
Abstract:
According to the need of practical use,a type of open microwave reactive cavity with plasmas,which is often used in the system of microwave-excited plasmas,is studied by use of the theory of open cavities.The effect of plasma densities and plasma collision frequencies on the field amplitude,field phase and reflection coefficient of the cavity is computed and analysed.It is clearly shown that the absorption of plasma to microwave is increased with the enhancement of the plasma collision frequency and that the standing wave pattern advantaging production of microwave plasmas can be effectively formed in that type of open structure.
According to the need of practical use,a type of open microwave reactive cavity with plasmas,which is often used in the system of microwave-excited plasmas,is studied by use of the theory of open cavities.The effect of plasma densities and plasma collision frequencies on the field amplitude,field phase and reflection coefficient of the cavity is computed and analysed.It is clearly shown that the absorption of plasma to microwave is increased with the enhancement of the plasma collision frequency and that the standing wave pattern advantaging production of microwave plasmas can be effectively formed in that type of open structure.
1997, 26(5): 529-532.
Abstract:
Computer simulation of the transversal spatial effects in CdS films at the thermo optical bistability is completed using Ulrbach's theory about red shift of absorption spectra curve of semiconductor excited by light and Eiry's theory about absorption F-P resonator.The simulation is consistent with the experimental results.Maximum density (104/cm3) of elements on OB matrixes of CdS films (thickness 1 μm) at room temperature is calculated.
Computer simulation of the transversal spatial effects in CdS films at the thermo optical bistability is completed using Ulrbach's theory about red shift of absorption spectra curve of semiconductor excited by light and Eiry's theory about absorption F-P resonator.The simulation is consistent with the experimental results.Maximum density (104/cm3) of elements on OB matrixes of CdS films (thickness 1 μm) at room temperature is calculated.
1997, 26(5): 533-538.
Abstract:
This paper describes the research and implementation of high availability system.By way of analyzing the system failure factors,a no-single-point-failure high availability system architecture is presented which uses the hardware and software redundancy technique to ensure server,disk,network reliability and privides efficient failure recovery.The implementation method is also given.
This paper describes the research and implementation of high availability system.By way of analyzing the system failure factors,a no-single-point-failure high availability system architecture is presented which uses the hardware and software redundancy technique to ensure server,disk,network reliability and privides efficient failure recovery.The implementation method is also given.
1997, 26(5): 539-543.
Abstract:
A software which is used to simplify logic function is introduced in this paper.The simplifying principle is based on a new method of logic function simplification.The data base technique is adopted while compiling program because the truth tables and implication tables used in the simplification method are all two-dimension forms.This paper comprises the overall design conception of the software and three special module's design idea.Different from the usual management and control software,this software is unique in its design method and proved to be exact.
A software which is used to simplify logic function is introduced in this paper.The simplifying principle is based on a new method of logic function simplification.The data base technique is adopted while compiling program because the truth tables and implication tables used in the simplification method are all two-dimension forms.This paper comprises the overall design conception of the software and three special module's design idea.Different from the usual management and control software,this software is unique in its design method and proved to be exact.
1997, 26(5): 544-548.
Abstract:
Based on the idea of integrating softwares with hardwares of microcomputers,the system described in this paper employs two biochemical analyzers connected to one microcomputer to realize the sharing of software and hareware resources,the reduction of system expenses.An out-system is used to manage data-testing in two analyzers.This paper provides detailed description of the key skills for realizing real-time data communication,data integration,and data base sharing and management.The methods discussed are applicable to the system designs of similar kinds.
Based on the idea of integrating softwares with hardwares of microcomputers,the system described in this paper employs two biochemical analyzers connected to one microcomputer to realize the sharing of software and hareware resources,the reduction of system expenses.An out-system is used to manage data-testing in two analyzers.This paper provides detailed description of the key skills for realizing real-time data communication,data integration,and data base sharing and management.The methods discussed are applicable to the system designs of similar kinds.
1997, 26(5): 549-551.
Abstract:
The karmarkar algorithm is one kind of ploynomial method of solving the linear programming,but it has the deteat that the fruit is not stable.Meanwhile,for the method is belonging to the inner point algorithm,the point get at the termination step is always approximately optimal.The gradient project method given in this paper can go throngh the inner part or the relative inner part of the boundary of area.It is also proved that the method will terminate at limit step in this paper.
The karmarkar algorithm is one kind of ploynomial method of solving the linear programming,but it has the deteat that the fruit is not stable.Meanwhile,for the method is belonging to the inner point algorithm,the point get at the termination step is always approximately optimal.The gradient project method given in this paper can go throngh the inner part or the relative inner part of the boundary of area.It is also proved that the method will terminate at limit step in this paper.
1997, 26(5): 552-556.
Abstract:
In this paper,the programming with inequality and equality constraints to unconstained programming is reduced by means of general gradients projection and penalty function technique.A general gradient projection algorithm with an arbitrary initial point is given and the condition in ref.[8] is simplified.The parameter of the penalty function is automatic adjusted in calculating.The method is convenient in application.
In this paper,the programming with inequality and equality constraints to unconstained programming is reduced by means of general gradients projection and penalty function technique.A general gradient projection algorithm with an arbitrary initial point is given and the condition in ref.[8] is simplified.The parameter of the penalty function is automatic adjusted in calculating.The method is convenient in application.
1997, 26(5): 557-559.
Abstract:
Using the theory of monotone flow,the globally quasi-convergent asymptotic behavior of the solutions to a class of topological system ẋ=F(x) is discussed.Under the condition that F(x) is analytic,cooperative and k-type,the flow of system is globally quasi convergent.The results about the system in Ref.[1] are developed.
Using the theory of monotone flow,the globally quasi-convergent asymptotic behavior of the solutions to a class of topological system ẋ=F(x) is discussed.Under the condition that F(x) is analytic,cooperative and k-type,the flow of system is globally quasi convergent.The results about the system in Ref.[1] are developed.
1997, 26(5): 560-563.
Abstract:
The automic analysis during the production line of nickel surfate on plating baths of electroless nickel plating process is given in this paper.Using the principle of continuous flow spectroptometry,the instrument of automic analysis on production line is developed.The regression equation between the nickel surfate concentration and absorbance is abtained through the standard concentration of nickel surfate being determined.The standard deviation of the instrument is less than 2% and the error comparing to the chemistic analystic method is less than 3%.The analytic time only 6 minutes.The instrument completely fits the automic analysis of nickel surfate during electreless nickel plating production line.
The automic analysis during the production line of nickel surfate on plating baths of electroless nickel plating process is given in this paper.Using the principle of continuous flow spectroptometry,the instrument of automic analysis on production line is developed.The regression equation between the nickel surfate concentration and absorbance is abtained through the standard concentration of nickel surfate being determined.The standard deviation of the instrument is less than 2% and the error comparing to the chemistic analystic method is less than 3%.The analytic time only 6 minutes.The instrument completely fits the automic analysis of nickel surfate during electreless nickel plating production line.
