ISSN 
2002 Vol. 31, No. 3
2002, 31(3): 221-224.
Abstract:
By viewing the optimum multiuser detector in code division multiple access communications systems as a combinational optimum problem, we apply the global optimum performance of genetic algorithms to design a kind of decorrelating multiuser detector based on parallel genetic algorithms(PGADEC-MUD). Theoretical analyses and numerical simulation results have shown that in aspect of multiple-access interference and near-far resistance, the PGADEC-MUD is better than the conventional detector and decorrelating multiuser detector and can be easily implemented by VLSI technology, which benefites from the parallel genetic algorithm.
By viewing the optimum multiuser detector in code division multiple access communications systems as a combinational optimum problem, we apply the global optimum performance of genetic algorithms to design a kind of decorrelating multiuser detector based on parallel genetic algorithms(PGADEC-MUD). Theoretical analyses and numerical simulation results have shown that in aspect of multiple-access interference and near-far resistance, the PGADEC-MUD is better than the conventional detector and decorrelating multiuser detector and can be easily implemented by VLSI technology, which benefites from the parallel genetic algorithm.
2002, 31(3): 225-228.
Abstract:
In this paper, the optical channel frame is presented to load data and the technology of SDH over WDM is utilized to improve the survivability of the WDM ring networks. The method has the character of realizing highly effective transmission via utilizing the extant facilities and the network management. Based on the analysis of the transmission characters of the ring networks that have self-healing function, a method of establishing mathematical model is discussed, and the relationship of the average rejection probability and the traffic is obtained.
In this paper, the optical channel frame is presented to load data and the technology of SDH over WDM is utilized to improve the survivability of the WDM ring networks. The method has the character of realizing highly effective transmission via utilizing the extant facilities and the network management. Based on the analysis of the transmission characters of the ring networks that have self-healing function, a method of establishing mathematical model is discussed, and the relationship of the average rejection probability and the traffic is obtained.
2002, 31(3): 229-233.
Abstract:
This paper analysis the feature extraction method of handwritten Chinese character. The contour direction feature(CDF)and directional distance distributions feature(DDDF) are extracted from Chinese character image as a pair of feature vectors having good complementarity. After dimensions reduction of original feature using Karhunen-Loeve transform, these two feature vectors are combined to produce a new feature vector has high discriminating powers. Basing on the characteristic of RBFNN classifier, a novel architecture which integrates feature fusion and modular RBF neural networks classifier approaches into a small set handwritten Chinese character recognition system is presented. Experiments show that the system has achieved impressive performance and the results are informing.
This paper analysis the feature extraction method of handwritten Chinese character. The contour direction feature(CDF)and directional distance distributions feature(DDDF) are extracted from Chinese character image as a pair of feature vectors having good complementarity. After dimensions reduction of original feature using Karhunen-Loeve transform, these two feature vectors are combined to produce a new feature vector has high discriminating powers. Basing on the characteristic of RBFNN classifier, a novel architecture which integrates feature fusion and modular RBF neural networks classifier approaches into a small set handwritten Chinese character recognition system is presented. Experiments show that the system has achieved impressive performance and the results are informing.
2002, 31(3): 234-239.
Abstract:
Genetic Algorithms is Optimal Algorithm, which employ a search technique based on ideas from Darwin's natural evolution theory. A new genetic algorithm (NGA) is proposed in this paper, which not only can keep the population diversity but also has quicker convergence speed. The experiment results show that the improved genetic algorithm can efficiently find global optimal beyond premature convergence. Finally, using the NGA, optimizing the topology and training the weights for BP neural network are done. The results of the applications show that the new genetic algorithm is practical and efficient.
Genetic Algorithms is Optimal Algorithm, which employ a search technique based on ideas from Darwin's natural evolution theory. A new genetic algorithm (NGA) is proposed in this paper, which not only can keep the population diversity but also has quicker convergence speed. The experiment results show that the improved genetic algorithm can efficiently find global optimal beyond premature convergence. Finally, using the NGA, optimizing the topology and training the weights for BP neural network are done. The results of the applications show that the new genetic algorithm is practical and efficient.
2002, 31(3): 240-244.
Abstract:
By means of integral equation of vector potential in the time domain and using several simple approximations, the electromagnetic fields on the axis in the far zone are calculated and compared. The attenuation characteristic of electromagnetic energy in the far zone radiated by some electromagnetic pulses are discussed. These pulses include the triangular pulse, the sinusoidal pulse of multiple cycles, the isosceles trapeze pulse, the Gauss pulse and the pulse produced in the experiment of the electromagnetic missile. Some general conclusions and special conclusions are obtained.
By means of integral equation of vector potential in the time domain and using several simple approximations, the electromagnetic fields on the axis in the far zone are calculated and compared. The attenuation characteristic of electromagnetic energy in the far zone radiated by some electromagnetic pulses are discussed. These pulses include the triangular pulse, the sinusoidal pulse of multiple cycles, the isosceles trapeze pulse, the Gauss pulse and the pulse produced in the experiment of the electromagnetic missile. Some general conclusions and special conclusions are obtained.
2002, 31(3): 245-249.
Abstract:
A set of coupled nonlinear differential equations of the FEL amplifier are derived in three dimensions for a configuration consisting of a coaxial waveguide and a coaxial hybrid wiggler. These equations include the effects of electron momentum spread, space-charge effects and wiggler taper governing the self-consistent evolution of TE mode and trajectories of an ensemble of electrons. The initial conditions are chosen to model the adiabatic injection of a annular electron beam. Computer program based on these equations is made and nonlinear including saturation efficiency and bandwidth is analyzed.
A set of coupled nonlinear differential equations of the FEL amplifier are derived in three dimensions for a configuration consisting of a coaxial waveguide and a coaxial hybrid wiggler. These equations include the effects of electron momentum spread, space-charge effects and wiggler taper governing the self-consistent evolution of TE mode and trajectories of an ensemble of electrons. The initial conditions are chosen to model the adiabatic injection of a annular electron beam. Computer program based on these equations is made and nonlinear including saturation efficiency and bandwidth is analyzed.
2002, 31(3): 250-254.
Abstract:
A new method for qualitative analysis of equilibrium points of Hopfield neural networks is given by using large-scale system theory and the quality of Minkowski matrix. Two qualitative theorems for neural networks are given both stability and instability. The amount of computation is reduced greatly viewed the different part of networks as subsystems. The restraint of intensity of the nonlinear interconnecting structure is not only a line, but also some suitable function.
A new method for qualitative analysis of equilibrium points of Hopfield neural networks is given by using large-scale system theory and the quality of Minkowski matrix. Two qualitative theorems for neural networks are given both stability and instability. The amount of computation is reduced greatly viewed the different part of networks as subsystems. The restraint of intensity of the nonlinear interconnecting structure is not only a line, but also some suitable function.
2002, 31(3): 255-261.
Abstract:
The traditional C/S database systems often suffer from the poor performance in the environment of Web applications because the number of users and the frequency or the times of accessing to a Web application are very difficult to be determined in advance.In this paper,a new method is proposed for the design,implementation and tuning of the Web based database system.This approach focuses on the configuration of RDBMS,the design of application model, and programming.By optimization on memory,on fragmentation,on disk parameters and on time related parameters,a better running environment of RDBMS can be set up.By reducing the CONNECT and DISCONNECT operations,creating suitable indexes,using more stored procedure and optimization on SQL,good performance can be got at programming step.By optimization on business logic and denormalization,the system performance can be greatly improved at design step.
The traditional C/S database systems often suffer from the poor performance in the environment of Web applications because the number of users and the frequency or the times of accessing to a Web application are very difficult to be determined in advance.In this paper,a new method is proposed for the design,implementation and tuning of the Web based database system.This approach focuses on the configuration of RDBMS,the design of application model, and programming.By optimization on memory,on fragmentation,on disk parameters and on time related parameters,a better running environment of RDBMS can be set up.By reducing the CONNECT and DISCONNECT operations,creating suitable indexes,using more stored procedure and optimization on SQL,good performance can be got at programming step.By optimization on business logic and denormalization,the system performance can be greatly improved at design step.
2002, 31(3): 262-265.
Abstract:
The principle of Formal Language and Auto Machine is build up to translate nature language into languages which can be identified and processed by computers.Text information can be intelligently monitored using finity auto machine.Information that is necessary for system monitoring can be obtained through the syntax analysis of text,it gives us a particular statement of the using of finity auto machine in the bulletin board system information monitor,and makes a general analysis of three types of Information monitor,Terminal monitor, Running monitor and Backup monitor. and also gives us a material solution of them,and gives us a vivid description of designing the system and software interface.
The principle of Formal Language and Auto Machine is build up to translate nature language into languages which can be identified and processed by computers.Text information can be intelligently monitored using finity auto machine.Information that is necessary for system monitoring can be obtained through the syntax analysis of text,it gives us a particular statement of the using of finity auto machine in the bulletin board system information monitor,and makes a general analysis of three types of Information monitor,Terminal monitor, Running monitor and Backup monitor. and also gives us a material solution of them,and gives us a vivid description of designing the system and software interface.
2002, 31(3): 266-269.
Abstract:
This article proposed a new technique using Genetic Algorithms to realize Real-time fuzzy control, discussed how to form the rules, to train the parameters, the relation between the training scale and the generalization of the model comparing results of different training scales. The model has less input parameters, less rules, and smaller errors than most of other models. It has advantages in both time and space complexity. It is easy to control, and has no restriction of experience knowledge. This method is applicable to Real-time system applications.
This article proposed a new technique using Genetic Algorithms to realize Real-time fuzzy control, discussed how to form the rules, to train the parameters, the relation between the training scale and the generalization of the model comparing results of different training scales. The model has less input parameters, less rules, and smaller errors than most of other models. It has advantages in both time and space complexity. It is easy to control, and has no restriction of experience knowledge. This method is applicable to Real-time system applications.
2002, 31(3): 270-274.
Abstract:
For the reason of the difficult to save and manage lots of realities of objects in object_oriented design, such as add,modify,delete,query,based on the advantage of data base management system. The relation of data base management and object attribute, so we can put data base management into oriented object design, and we need to solute two problem:the store of object to data base and data base to object. Because oriented object has some character, such as classes relation and heirship, so we also need to solute them. The method is easy and useful.
For the reason of the difficult to save and manage lots of realities of objects in object_oriented design, such as add,modify,delete,query,based on the advantage of data base management system. The relation of data base management and object attribute, so we can put data base management into oriented object design, and we need to solute two problem:the store of object to data base and data base to object. Because oriented object has some character, such as classes relation and heirship, so we also need to solute them. The method is easy and useful.
2002, 31(3): 275-280.
Abstract:
This paper presents a novel hierarchical cache consistence mechanism-HCMM. HCMM is specially designed for the large scale distributed file system in WAN and can well adapt to work in WAN. HCMM uses hierarchical method to manage the consistence of cache, and can minimize the overhead of network communication and cache management. This paper also sets up a theory model to analyze the performance of HCMM. The results of theory analysis prove that the performance of HCMM is better than conventional cache consistence mechanism.
This paper presents a novel hierarchical cache consistence mechanism-HCMM. HCMM is specially designed for the large scale distributed file system in WAN and can well adapt to work in WAN. HCMM uses hierarchical method to manage the consistence of cache, and can minimize the overhead of network communication and cache management. This paper also sets up a theory model to analyze the performance of HCMM. The results of theory analysis prove that the performance of HCMM is better than conventional cache consistence mechanism.
2002, 31(3): 281-285.
Abstract:
This paper describes timeout-based sessionizing mechanisms and topology-aware heuristics which now used to identify user sessions. The Sessionizing tools are based on heuristic rules and on assumptions about the site's usage,and therefore prone to error.The paper proposes a formal framework composed of a set of measures for the evaluation the accuracy of sessionizing tools.The different measures reflect the requitements of different web usage analysis applications.Experiment using the log data of a real web site shows the use of the measures.
This paper describes timeout-based sessionizing mechanisms and topology-aware heuristics which now used to identify user sessions. The Sessionizing tools are based on heuristic rules and on assumptions about the site's usage,and therefore prone to error.The paper proposes a formal framework composed of a set of measures for the evaluation the accuracy of sessionizing tools.The different measures reflect the requitements of different web usage analysis applications.Experiment using the log data of a real web site shows the use of the measures.
2002, 31(3): 286-288.
Abstract:
This paper uses serial communication active control provided by Visual Basic 6.0 to log and monitor parameters of drying temperature, air humidity and velocity, the evaporation pressure and condensation pressure of the refrigerant automatically by a computer, reducing the intensity of operation, increasing the control precision on working conditions and improving the performance of the heat pump drying system.
This paper uses serial communication active control provided by Visual Basic 6.0 to log and monitor parameters of drying temperature, air humidity and velocity, the evaporation pressure and condensation pressure of the refrigerant automatically by a computer, reducing the intensity of operation, increasing the control precision on working conditions and improving the performance of the heat pump drying system.
2002, 31(3): 289-293.
Abstract:
For the speed servo system of the two-phase motor, analyzing its mechanical property and adjusting property while it is worked by amplitude control, factors to affect the two-phase motor dynamic characteristic are proposed, which are changes of its mechanical time constant and its gain factor. To prevent the dynamic characteristic of the system from being worse, as changes of its mechanical time constant and its gain factor, a simple following model reference adaptive control method can be used to improve the dynamic characteristic of the system and increase its controlling precision, by adjusting the model and the self-adaptive set. Computer simulation shows its availability finally.
For the speed servo system of the two-phase motor, analyzing its mechanical property and adjusting property while it is worked by amplitude control, factors to affect the two-phase motor dynamic characteristic are proposed, which are changes of its mechanical time constant and its gain factor. To prevent the dynamic characteristic of the system from being worse, as changes of its mechanical time constant and its gain factor, a simple following model reference adaptive control method can be used to improve the dynamic characteristic of the system and increase its controlling precision, by adjusting the model and the self-adaptive set. Computer simulation shows its availability finally.
2002, 31(3): 294-298.
Abstract:
This paper concerns the structure of inside and outside cylindrical shells with packing material between the two shells. Due to the eccentricity of the inside shell, there will be relative slippage between the inside & outside cylindrical shells and the pack material when the shells are subjected to transverse impulsive. After giving the kinetic equation of the structure, the mechanism of the relative slippage is fully analyzed, including the reason of the slippage, the effect on the slippage of mechanical factors such as the enclasping force, the eccentricity, the elastic inertia and rotary inertia of the packing and the impulsive load. Numerical results of an example, which prove the correctness of the theoretical analysis, are also presented. At the end of the paper, suggestions are given to control or avoid the relative slippage.
This paper concerns the structure of inside and outside cylindrical shells with packing material between the two shells. Due to the eccentricity of the inside shell, there will be relative slippage between the inside & outside cylindrical shells and the pack material when the shells are subjected to transverse impulsive. After giving the kinetic equation of the structure, the mechanism of the relative slippage is fully analyzed, including the reason of the slippage, the effect on the slippage of mechanical factors such as the enclasping force, the eccentricity, the elastic inertia and rotary inertia of the packing and the impulsive load. Numerical results of an example, which prove the correctness of the theoretical analysis, are also presented. At the end of the paper, suggestions are given to control or avoid the relative slippage.
2002, 31(3): 299-304.
Abstract:
It analyzes the situation and the difficulties of West high-tech industry's development. It also points out the characters of the industry that it can exert SMEs' virtue sufficiently and offer them rare development chance. In contrary SMEs' development can accelerate high-tech industry's development. It also discusses that the interaction between West SMEs and high-tech industry can accelerate the increase of West economy and it also puts forward the idea that we should accelerate West SMEs and high-tech industry's corporate development.
It analyzes the situation and the difficulties of West high-tech industry's development. It also points out the characters of the industry that it can exert SMEs' virtue sufficiently and offer them rare development chance. In contrary SMEs' development can accelerate high-tech industry's development. It also discusses that the interaction between West SMEs and high-tech industry can accelerate the increase of West economy and it also puts forward the idea that we should accelerate West SMEs and high-tech industry's corporate development.
2002, 31(3): 305-308.
Abstract:
Considering the steady development of securities market and the equity in the process of social resources reallocation, this article, starting from market mechanism, there are three respects core problems of state-owned stock reduction:pricing of state-owned shares、operational mechanism of state-owned stock sell-off、speed of state-owned stock sell-off. This paper puts forward the tactic of state-held shares rationing through floating pricing. On one hand, this article explores the operation practicability of state-owned stock sell-off and circulation; on the other hand, this article raises the relevant proposals on the state-held shares circulation.
Considering the steady development of securities market and the equity in the process of social resources reallocation, this article, starting from market mechanism, there are three respects core problems of state-owned stock reduction:pricing of state-owned shares、operational mechanism of state-owned stock sell-off、speed of state-owned stock sell-off. This paper puts forward the tactic of state-held shares rationing through floating pricing. On one hand, this article explores the operation practicability of state-owned stock sell-off and circulation; on the other hand, this article raises the relevant proposals on the state-held shares circulation.
2002, 31(3): 309-312.
Abstract:
China's entry of WTO has brought radical impact to its Hi-tech products marketing in the world market. This paper providec an overview of the challenge and the necessity of changing old conceptions. Based an the theory of global economic integration. The paper presents some strategies developing e-commerce to take the place of traditional marketing techniques so as to create favourable situation for China's Hi-tech products international marketing.
China's entry of WTO has brought radical impact to its Hi-tech products marketing in the world market. This paper providec an overview of the challenge and the necessity of changing old conceptions. Based an the theory of global economic integration. The paper presents some strategies developing e-commerce to take the place of traditional marketing techniques so as to create favourable situation for China's Hi-tech products international marketing.
2002, 31(3): 313-315.
Abstract:
This paper studies the unique continuation properties of the Maxwell's equation and the wave equation. Under some assumed conditions, by using the Carleman estimating method and the integral transformation we obtain the unique continuation properties of the Maxwell's equation and the wave equation. We solve the controllability problem of the semilinear wave equation by these results obtained in this paper.
This paper studies the unique continuation properties of the Maxwell's equation and the wave equation. Under some assumed conditions, by using the Carleman estimating method and the integral transformation we obtain the unique continuation properties of the Maxwell's equation and the wave equation. We solve the controllability problem of the semilinear wave equation by these results obtained in this paper.
2002, 31(3): 316-319.
Abstract:
Based on the block diagonally dominant matrices, block strictly diagonally dominant matrices and irreducible diagonally dominant matrix, by the block α-connective diagonally dominant, the irreducibly block diagonal dominance is introduced and the block method are applied, and new simple equivalent conditions of the block H-matrices are obtained, which generalizes and includes the corresponding results of the matrices.
Based on the block diagonally dominant matrices, block strictly diagonally dominant matrices and irreducible diagonally dominant matrix, by the block α-connective diagonally dominant, the irreducibly block diagonal dominance is introduced and the block method are applied, and new simple equivalent conditions of the block H-matrices are obtained, which generalizes and includes the corresponding results of the matrices.
2002, 31(3): 320-324.
Abstract:
Iterations of continuous self maps on the interval are the most simple model, which arise some interesting mathmatics structures, in dynamical systems. These systems depend on a characteristic parameter controlled with experiment. The paper discusses the contents of unimodal dynamical systems, proving the uniqueness of λP and then one between 0 and 0.382 9 as unimodal differentiable flat-top functions for any MSS sequence P. It draws a conlusion from the uniqueness of P>RL, and therefore one of P>RL2 in special circumstances for trapezoid functions.
Iterations of continuous self maps on the interval are the most simple model, which arise some interesting mathmatics structures, in dynamical systems. These systems depend on a characteristic parameter controlled with experiment. The paper discusses the contents of unimodal dynamical systems, proving the uniqueness of λP and then one between 0 and 0.382 9 as unimodal differentiable flat-top functions for any MSS sequence P. It draws a conlusion from the uniqueness of P>RL, and therefore one of P>RL2 in special circumstances for trapezoid functions.
2002, 31(3): 325-327.
Abstract:
Constructing orthonormal wavelet bases from splines is a method used often. But when wavelet scaling functions are constructed by splines,first step is orthogonalization,in which an infinite series defined by Fourier transform of splines is summed.The approaches used currently to sum the infinite series are complicated.In this paper,the summation of the infinite series defined by Fourier transform of splines is turned to sum a finite series defined by splines over integer by means of spline properties,therefore computation of the summation is efficiently simplified.
Constructing orthonormal wavelet bases from splines is a method used often. But when wavelet scaling functions are constructed by splines,first step is orthogonalization,in which an infinite series defined by Fourier transform of splines is summed.The approaches used currently to sum the infinite series are complicated.In this paper,the summation of the infinite series defined by Fourier transform of splines is turned to sum a finite series defined by splines over integer by means of spline properties,therefore computation of the summation is efficiently simplified.
