ISSN 
2001 Vol. 30, No. 2
2001, 30(2): 115-119.
Abstract:
A class of mixed chaotic sequence, which is produced by combining logistic sequence and m sequence in the form of exclusive-OR, is presented in this paper. The period, balance, correlation and linear complexity for a class of mixed chaotic sequences are analyzed systematically. The results show that the properties of the mixed chaotic sequence are good, and the sequence generator can be easily realized by the use of digital circuits. It is a class of promising pseudo-random sequence in practical applications.
A class of mixed chaotic sequence, which is produced by combining logistic sequence and m sequence in the form of exclusive-OR, is presented in this paper. The period, balance, correlation and linear complexity for a class of mixed chaotic sequences are analyzed systematically. The results show that the properties of the mixed chaotic sequence are good, and the sequence generator can be easily realized by the use of digital circuits. It is a class of promising pseudo-random sequence in practical applications.
2001, 30(2): 120-123.
Abstract:
In this paper, a new method of speckle reduction in polarimetric SAR image is proposed. Based on the method, the texture parameters of multi-polarimetric channels are estimated simultaneously by the method of maximum likelihood under the assumption of multi-texture multiplicative speckle noise model. This method preserves the polarimetric properties, reduces the couple between polarimetric channels, and gets the better effect of speckle reduction. It is also compared with the PWF (polarimetric whitening filter).
In this paper, a new method of speckle reduction in polarimetric SAR image is proposed. Based on the method, the texture parameters of multi-polarimetric channels are estimated simultaneously by the method of maximum likelihood under the assumption of multi-texture multiplicative speckle noise model. This method preserves the polarimetric properties, reduces the couple between polarimetric channels, and gets the better effect of speckle reduction. It is also compared with the PWF (polarimetric whitening filter).
2001, 30(2): 124-128,133.
Abstract:
This paper suggestes a new algorithm model of binary & ternary-tree contention resolution algorithm, and derives the mean slots formula used in resoluting collision. Comparing with basic contention resolution algorithm, this result gets a high efficiency. The throughput character of blocked access channel is also analyzed through computer simulation.
This paper suggestes a new algorithm model of binary & ternary-tree contention resolution algorithm, and derives the mean slots formula used in resoluting collision. Comparing with basic contention resolution algorithm, this result gets a high efficiency. The throughput character of blocked access channel is also analyzed through computer simulation.
2001, 30(2): 129-133.
Abstract:
By contrastive experimental analyzing of the single layer film and multilayer film of magneto-optical recording medium TbFeCo in room and high temperature condition, it is proved that the magneto-optical medium has high stability by adopting multilayer film structure. the XPS analysis of element of TbFeCo also proves the conclusion.
By contrastive experimental analyzing of the single layer film and multilayer film of magneto-optical recording medium TbFeCo in room and high temperature condition, it is proved that the magneto-optical medium has high stability by adopting multilayer film structure. the XPS analysis of element of TbFeCo also proves the conclusion.
2001, 30(2): 134-138.
Abstract:
Boundary surface analysis method for workspace of double-octahedron variable geometry truss robotic manipulators(VGTRM) is proposed in this paper. Based on surface analysis and analytical method of direct displacement analysis, the analytical surface equations of double-octahedron VGTRM are derived. Precise shape of double-octahedron VGTRM(s workspace boundary surface is drawn. Analysis and calculations show that the workspace of double-octahedron VGTRM is enveloped by six surface patchs.
Boundary surface analysis method for workspace of double-octahedron variable geometry truss robotic manipulators(VGTRM) is proposed in this paper. Based on surface analysis and analytical method of direct displacement analysis, the analytical surface equations of double-octahedron VGTRM are derived. Precise shape of double-octahedron VGTRM(s workspace boundary surface is drawn. Analysis and calculations show that the workspace of double-octahedron VGTRM is enveloped by six surface patchs.
2001, 30(2): 139-143.
Abstract:
Based on the fact that the tracking error asymptotically approaches zero, a new nonlinear delayed feedback control approach of discrete chaotic systems is presented. Such control approach that uses the step-N delayed output of a chaotic system to estimate the unstable period-N orbit and to be the tracking target can stabilize a controlled chaotic system onto a deterministic point in the phase space as well as a period-N orbit. Theory and experiments show that the control approach is robust.
Based on the fact that the tracking error asymptotically approaches zero, a new nonlinear delayed feedback control approach of discrete chaotic systems is presented. Such control approach that uses the step-N delayed output of a chaotic system to estimate the unstable period-N orbit and to be the tracking target can stabilize a controlled chaotic system onto a deterministic point in the phase space as well as a period-N orbit. Theory and experiments show that the control approach is robust.
2001, 30(2): 144-147.
Abstract:
The security and efficiency of ECC are analyzed comparing with other public-key cryptosystems. It is shown that ECC can provide greater strength, higher speed and smaller keys than other systems. Thus ECC can get relatively high security with less cost and time delay, and can meet security requirements in some applications with limited bandwidth, computational power or storage space.
The security and efficiency of ECC are analyzed comparing with other public-key cryptosystems. It is shown that ECC can provide greater strength, higher speed and smaller keys than other systems. Thus ECC can get relatively high security with less cost and time delay, and can meet security requirements in some applications with limited bandwidth, computational power or storage space.
2001, 30(2): 148-152.
Abstract:
This paper introduces UML(Unified Modeling Language) modeling method. Based on the experience of traditional software development method and the analysis of traditional three layered structure of abstraction in UML, two ideas of abstraction and decomposition are brought forward as the kernel modeling ideas of UML to construct the abstraction modeling mechanism of UML that generalizes the process of computer system into the process of picking up five cells:the function cell. the structure cell, the service cell, the implementation cell and the integration cell. The purpose is to make use of the whole semantics of UML effectively and to get over the limitation of traditional OO method and eventually to achieve the perfectly transition from requirement to analysis and virtual separation of function and implementation.
This paper introduces UML(Unified Modeling Language) modeling method. Based on the experience of traditional software development method and the analysis of traditional three layered structure of abstraction in UML, two ideas of abstraction and decomposition are brought forward as the kernel modeling ideas of UML to construct the abstraction modeling mechanism of UML that generalizes the process of computer system into the process of picking up five cells:the function cell. the structure cell, the service cell, the implementation cell and the integration cell. The purpose is to make use of the whole semantics of UML effectively and to get over the limitation of traditional OO method and eventually to achieve the perfectly transition from requirement to analysis and virtual separation of function and implementation.
2001, 30(2): 153-156.
Abstract:
This paper introduces the open management mode for PC station, in which an IC card system is used. A solution for the management efficiency of PC station is also given by cutting down the numerous and jumbled manual data used in traditional managerial method, keeping out counterfeit notes or receipts, and facilitating the statistic job. This automatic and open mode of management using IC card system is convenient, safe, and applicable for PC station.
This paper introduces the open management mode for PC station, in which an IC card system is used. A solution for the management efficiency of PC station is also given by cutting down the numerous and jumbled manual data used in traditional managerial method, keeping out counterfeit notes or receipts, and facilitating the statistic job. This automatic and open mode of management using IC card system is convenient, safe, and applicable for PC station.
2001, 30(2): 157-161.
Abstract:
The general examination system provides a complete solution of common examinations without paper. It has many useful functionalities including the creation of DataBase, the edit for the questions with picture, the building and the simulative analysis of test paper, the stochastic creation of test paper, the terminal interface of examinee, and the invigilation on network. It can also manage and stat the scores. In this paper, the characteristics of the software developed by VC++ and the key techniques of its realization are introduced.
The general examination system provides a complete solution of common examinations without paper. It has many useful functionalities including the creation of DataBase, the edit for the questions with picture, the building and the simulative analysis of test paper, the stochastic creation of test paper, the terminal interface of examinee, and the invigilation on network. It can also manage and stat the scores. In this paper, the characteristics of the software developed by VC++ and the key techniques of its realization are introduced.
2001, 30(2): 162-165.
Abstract:
In this paper, a kind of user name & password authentication based on SOCKS V5 firewall is redesigned. Its principle and implementation are illustrated in detail. The method identifier of user name/password and some data structures are defined, and an anthentication database is implemented. The authentication process is also demonstrated in the flow figure. The system's performance and state conversions are further prescribed in petri net mode.
In this paper, a kind of user name & password authentication based on SOCKS V5 firewall is redesigned. Its principle and implementation are illustrated in detail. The method identifier of user name/password and some data structures are defined, and an anthentication database is implemented. The authentication process is also demonstrated in the flow figure. The system's performance and state conversions are further prescribed in petri net mode.
2001, 30(2): 166-170.
Abstract:
This paper introduces the networked automatic alarm system, in which "685 Digital Alarm Receiver" is explored, which is the most important equipment in the system center. This paper also introduces the main characteristics of the system software including the design of center database and buffer database, the integrated and intellectualized interface etc. The important technniques about its software based on Visual Basic and ACCESS are described.
This paper introduces the networked automatic alarm system, in which "685 Digital Alarm Receiver" is explored, which is the most important equipment in the system center. This paper also introduces the main characteristics of the system software including the design of center database and buffer database, the integrated and intellectualized interface etc. The important technniques about its software based on Visual Basic and ACCESS are described.
2001, 30(2): 171-174.
Abstract:
This paper introduces a electrotechics computer assisted instruction system. The structure and interaction of the system are analyzed. The selection of developing tools is also investigated. The main componences of the system are given including assisting exercises, typical examples, experiments and electronic blackboard. The system accords with the law of electrotechnics teaching,computer assisted instruction and has distinct character in computer assisted instruction.
This paper introduces a electrotechics computer assisted instruction system. The structure and interaction of the system are analyzed. The selection of developing tools is also investigated. The main componences of the system are given including assisting exercises, typical examples, experiments and electronic blackboard. The system accords with the law of electrotechnics teaching,computer assisted instruction and has distinct character in computer assisted instruction.
2001, 30(2): 175-180.
Abstract:
In this paper, the reliability of a fault-tolerance computer system is evaluated by Markov status graph. Majority voting method and single store method are used to evaluate the reliability and usability of the fault-tolerance system. Through practical computation, the comparison data are also given.
In this paper, the reliability of a fault-tolerance computer system is evaluated by Markov status graph. Majority voting method and single store method are used to evaluate the reliability and usability of the fault-tolerance system. Through practical computation, the comparison data are also given.
2001, 30(2): 181-184.
Abstract:
Long lifetime is a base for thermal printing heads to be applied widely. Experiments on these thermal printing heads include high temperature storage tests, shaking tests, pulse-heat tests, and actual thermal printing tests. From the experiments, five degradation modes of thermal printing heads are summarized. The degradation reasons for the five modes are analyzed and the means of increasing the lifetime of thermal printing heads are demonstrated.
Long lifetime is a base for thermal printing heads to be applied widely. Experiments on these thermal printing heads include high temperature storage tests, shaking tests, pulse-heat tests, and actual thermal printing tests. From the experiments, five degradation modes of thermal printing heads are summarized. The degradation reasons for the five modes are analyzed and the means of increasing the lifetime of thermal printing heads are demonstrated.
2001, 30(2): 185-191.
Abstract:
There are many defects that cause inefficiency in design of incentive mechenism for classic principal-agent theory. This paper builds a synthetic motive model on the basis of the economic times and intellectualization and intelligence hires capital. A new incentive mechanism is set up in which property rights is contained, and its structure is also analyzed quantitatively. It is shown that it is important for the manager to enjoy his property rights in order to keep the enterprise stead and active.
There are many defects that cause inefficiency in design of incentive mechenism for classic principal-agent theory. This paper builds a synthetic motive model on the basis of the economic times and intellectualization and intelligence hires capital. A new incentive mechanism is set up in which property rights is contained, and its structure is also analyzed quantitatively. It is shown that it is important for the manager to enjoy his property rights in order to keep the enterprise stead and active.
2001, 30(2): 192-194.
Abstract:
In this paper, related questions of M-matrices and H-matrices are studied. The concept of inverse H-matrices is defined. The relationship between the inverse M-matrices and the inverse H-matrices, criteria for the inverse H-matrices, properties of the Hadamard product of inverse H-matrices,relationship between the inverse H-matrices and diagonal dominance of matrices are presented. A kind of matrix class is generalized.
In this paper, related questions of M-matrices and H-matrices are studied. The concept of inverse H-matrices is defined. The relationship between the inverse M-matrices and the inverse H-matrices, criteria for the inverse H-matrices, properties of the Hadamard product of inverse H-matrices,relationship between the inverse H-matrices and diagonal dominance of matrices are presented. A kind of matrix class is generalized.
2001, 30(2): 195-198.
Abstract:
This paper deals with input-to-state stabilization of a class of input-saturated linear systems. A simple linear feedback controller is constructed by which the input-to-state stabilizes the class of input-saturated systems with two properties, namely that the uncontrolled systems are critical stable and a standard controllable condition holds. As an application, a feedback law is designed to stabilize a cascade system.
This paper deals with input-to-state stabilization of a class of input-saturated linear systems. A simple linear feedback controller is constructed by which the input-to-state stabilizes the class of input-saturated systems with two properties, namely that the uncontrolled systems are critical stable and a standard controllable condition holds. As an application, a feedback law is designed to stabilize a cascade system.
2001, 30(2): 199-202.
Abstract:
Suppose A is an n by n complex matrix, whether a H-matrix is of important in many application fields is discussed in this paper. Many concept of diagonal dominance of matrices are special cases of H-matrices. The concept of local double α-diagonally dominant matrix is introduced. The new matrix class contains the strictly diagonally dominant matrix, connect diagonally dominant matrix and the matrices. A sufficient condition and an equivalent condition of H-matrices are obtained.
Suppose A is an n by n complex matrix, whether a H-matrix is of important in many application fields is discussed in this paper. Many concept of diagonal dominance of matrices are special cases of H-matrices. The concept of local double α-diagonally dominant matrix is introduced. The new matrix class contains the strictly diagonally dominant matrix, connect diagonally dominant matrix and the matrices. A sufficient condition and an equivalent condition of H-matrices are obtained.
2001, 30(2): 203-205.
Abstract:
This paper defines the conception of uniformly integrability and the norms of Fuzzy set, and gets the relation between the norms of Fuzzy set and the uniformly integrability of Fuzzy random variable. Based on the analysis, the important results on Fuzzy martingales and the convergence of Fuzzy martingales according to the distances d∞,d1 are given.
This paper defines the conception of uniformly integrability and the norms of Fuzzy set, and gets the relation between the norms of Fuzzy set and the uniformly integrability of Fuzzy random variable. Based on the analysis, the important results on Fuzzy martingales and the convergence of Fuzzy martingales according to the distances d∞,d1 are given.
2001, 30(2): 206-208.
Abstract:
A simulation study on the transition properties of microstructures in the solidification process of liquid metal Al is performed using the molecular dynamics method. It is found that in the range of temperature of 943~50 K, the relative numbers of 1551 bonds related to the icosahedral structure increase remarkably, which play a critical role in the variation of structural configurations during the rapid cooling process. It is also demonstrated that with the decrease of temperature, the degree of the order of the system increases, while, the degree of disorder of the system decreases.
A simulation study on the transition properties of microstructures in the solidification process of liquid metal Al is performed using the molecular dynamics method. It is found that in the range of temperature of 943~50 K, the relative numbers of 1551 bonds related to the icosahedral structure increase remarkably, which play a critical role in the variation of structural configurations during the rapid cooling process. It is also demonstrated that with the decrease of temperature, the degree of the order of the system increases, while, the degree of disorder of the system decreases.
2001, 30(2): 209-213.
Abstract:
In order to prepare suspending particles for electrorheological fluids, hetergeneous hydrolysis of acrylonitrile terpolymer is conducted in presence of saponifying agent(sodium hydroxide) in this paper. The effects of the saponification conditions such as the amount of added sodium hydroxide, time duration and temperature on the degree of saponification are studied in detail. Meanwhile, the conversion of nitrile groups is discussed with the result that the saponification of nitrile groups of the terpolymer initially yields amide groups, then slows down to carboxylic groups. The research sets a way for the preparation of dispersing particles of water-free electrorheological fluids tentatively used for controlling light transmittance.
In order to prepare suspending particles for electrorheological fluids, hetergeneous hydrolysis of acrylonitrile terpolymer is conducted in presence of saponifying agent(sodium hydroxide) in this paper. The effects of the saponification conditions such as the amount of added sodium hydroxide, time duration and temperature on the degree of saponification are studied in detail. Meanwhile, the conversion of nitrile groups is discussed with the result that the saponification of nitrile groups of the terpolymer initially yields amide groups, then slows down to carboxylic groups. The research sets a way for the preparation of dispersing particles of water-free electrorheological fluids tentatively used for controlling light transmittance.
2001, 30(2): 214-216.
Abstract:
Based on the theory that gravitational field is vector field, this paper expounds the properties of gravitational field. The relevant differential form and integral form are obtained with the help of Gauss theorem and Loop theorem describing the gravitational field.Consequent differential form and integral form of gravitational potential are deduced from the two laws of gravitational field.
Based on the theory that gravitational field is vector field, this paper expounds the properties of gravitational field. The relevant differential form and integral form are obtained with the help of Gauss theorem and Loop theorem describing the gravitational field.Consequent differential form and integral form of gravitational potential are deduced from the two laws of gravitational field.
