ISSN 
2004 Vol. 33, No. 5
2004, 33(5): 485-488.
Abstract:
In this paper, complete spectral integral representations (Sommerfeld integrals) of the electric-field-type dyadic Green's functions for half-space were derived via spectral-domain expansion of the radiation field of dipole located in free space. The Green's functions of reflection or transmission electric field were given, corresponding to the case of source point and observation point located in the same side or the opposite side, respectively. Especially, the results and physical explains were given for source point and observation point overlapping in vertical direction, which eliminate the singularities arising in the general representations. Numerical computation results show the validity of the presented formulas.
In this paper, complete spectral integral representations (Sommerfeld integrals) of the electric-field-type dyadic Green's functions for half-space were derived via spectral-domain expansion of the radiation field of dipole located in free space. The Green's functions of reflection or transmission electric field were given, corresponding to the case of source point and observation point located in the same side or the opposite side, respectively. Especially, the results and physical explains were given for source point and observation point overlapping in vertical direction, which eliminate the singularities arising in the general representations. Numerical computation results show the validity of the presented formulas.
2004, 33(5): 489-491.
Abstract:
This article introduces the basic principle of the Coordinate Rotation Digital Compute (CORDIC) algorithm and key feature of modified Vector Rotational CORDIC (MVR-CORIDC) algorithm. A new algorithm is presented which is base on MVR-CORDIC algorithm. The modified MVR-CORDIC algorithm makes use of the searching ROM table to calculate scaling factor instead of original method in MVR-CORDIC algorithm. This paper analyses capacity of ROM table of modified MVR-CORIDC algorithm, further more a detail implementation frame is given. The experiment result shows that the modified MVR-CORDIC algorithm is more suitable than original algorithm in realization with very large scale integration.
This article introduces the basic principle of the Coordinate Rotation Digital Compute (CORDIC) algorithm and key feature of modified Vector Rotational CORDIC (MVR-CORIDC) algorithm. A new algorithm is presented which is base on MVR-CORDIC algorithm. The modified MVR-CORDIC algorithm makes use of the searching ROM table to calculate scaling factor instead of original method in MVR-CORDIC algorithm. This paper analyses capacity of ROM table of modified MVR-CORIDC algorithm, further more a detail implementation frame is given. The experiment result shows that the modified MVR-CORDIC algorithm is more suitable than original algorithm in realization with very large scale integration.
2004, 33(5): 492-495.
Abstract:
The pulse compression in dechirp way for Wideband LFM signals can effectively decrease sampling frequency, which is only valid specifically for some pulse compression by the limit of the delay between target and reference point. At the same time, the result is influenced by the delay between target and reference point and Doppler frequency. This paper analyses the influences on the performance of pulse compression by the delay between target and reference point and Doppler frequency theoretically and simulatively. The simulation results in several conditions give references to select signal bandwidth, sampling frequency and the delay between target and reference point in engineering applications.
The pulse compression in dechirp way for Wideband LFM signals can effectively decrease sampling frequency, which is only valid specifically for some pulse compression by the limit of the delay between target and reference point. At the same time, the result is influenced by the delay between target and reference point and Doppler frequency. This paper analyses the influences on the performance of pulse compression by the delay between target and reference point and Doppler frequency theoretically and simulatively. The simulation results in several conditions give references to select signal bandwidth, sampling frequency and the delay between target and reference point in engineering applications.
2004, 33(5): 496-498,530.
Abstract:
Prony's method has been combined with time domain integral equation (TDIE) to solve transient response from arbitrary thin wire structure. Early-time response is calculated by TDIE. Prony's method is used to extract the pole from early-time response, the late-time response can be calculated efficiently. The present method avoids tedious computations in conventional TDIE, the efficiency of solving the transient response is speed up greatly. The current distributions on conducting straight wire and a circular loop excited by a Gaussian pulse are computed.
Prony's method has been combined with time domain integral equation (TDIE) to solve transient response from arbitrary thin wire structure. Early-time response is calculated by TDIE. Prony's method is used to extract the pole from early-time response, the late-time response can be calculated efficiently. The present method avoids tedious computations in conventional TDIE, the efficiency of solving the transient response is speed up greatly. The current distributions on conducting straight wire and a circular loop excited by a Gaussian pulse are computed.
2004, 33(5): 499-502.
Abstract:
Using the advantage of genetic algorithm and tabu search, an embedded hybrid optimization algorithm is introduced. A multiuser detector based on the embedded hybrid optimization algorithm is proposed. Numerical results show that the proposed detector provides better performance and has reasonable computational complexity.
Using the advantage of genetic algorithm and tabu search, an embedded hybrid optimization algorithm is introduced. A multiuser detector based on the embedded hybrid optimization algorithm is proposed. Numerical results show that the proposed detector provides better performance and has reasonable computational complexity.
2004, 33(5): 503-506.
Abstract:
Based on multiple-input-multiple-output (MIMO) scattering wireless fading channel model, a dynamic receiving and transmitting model for MIMO wireless channels is proposed in this paper, which is used for analyzing the impact of mobility of transceiver antennas on spatial correlation and capacity of MIMO wireless channels. The results show that the effects are determined by the original positions of transceiver antennas and by their velocity. The simulation results validate this impact and point out that there exists an optimum angular spread that forces spatial correlation, which decreases with increasing antenna spacing and does not consistently decrease with increasing angular spread, to reach minimum.
Based on multiple-input-multiple-output (MIMO) scattering wireless fading channel model, a dynamic receiving and transmitting model for MIMO wireless channels is proposed in this paper, which is used for analyzing the impact of mobility of transceiver antennas on spatial correlation and capacity of MIMO wireless channels. The results show that the effects are determined by the original positions of transceiver antennas and by their velocity. The simulation results validate this impact and point out that there exists an optimum angular spread that forces spatial correlation, which decreases with increasing antenna spacing and does not consistently decrease with increasing angular spread, to reach minimum.
2004, 33(5): 507-510.
Abstract:
Based on the physical optics(PO) theory, perfectly electrical conductor(PEC)and leontovich boundary condition(IBC), the high-efficiency formula of the conducted flat and the PEC flat coated with radar absorb materials(RAM) is built up.This formula can also be used on the surface of cylinder and sphere surfaces. Meanwhile, several results are given to demonstrate the validation of this method. Finally, radar cross section (RCS) of an object with super large electrical size computed by this method shows the high efficiency and practicality.
Based on the physical optics(PO) theory, perfectly electrical conductor(PEC)and leontovich boundary condition(IBC), the high-efficiency formula of the conducted flat and the PEC flat coated with radar absorb materials(RAM) is built up.This formula can also be used on the surface of cylinder and sphere surfaces. Meanwhile, several results are given to demonstrate the validation of this method. Finally, radar cross section (RCS) of an object with super large electrical size computed by this method shows the high efficiency and practicality.
2004, 33(5): 511-514.
Abstract:
The performance of direction-of-arrival (DOA) estimation algorithms is seriously degenerated when there are errors in array manifold. A correlative based technique, which estimates and calibrates the circle array antenna channel uncertainty used an auxiliary source, is given in this paper. Moreover, the high-accuracy DOA estimation algorithm using digital interferometer and all these algorithms' DSP implementations are also studied. The efficiency of the method is confirmed by computer simulation.
The performance of direction-of-arrival (DOA) estimation algorithms is seriously degenerated when there are errors in array manifold. A correlative based technique, which estimates and calibrates the circle array antenna channel uncertainty used an auxiliary source, is given in this paper. Moreover, the high-accuracy DOA estimation algorithm using digital interferometer and all these algorithms' DSP implementations are also studied. The efficiency of the method is confirmed by computer simulation.
2004, 33(5): 515-518.
Abstract:
According to multiscale and accurate characterization of vehicle-license-plate (VLP) texture feature by wavelet hidden Markov tree model (WHMTM), a method of VLP Location based on WHMTM is proposed in this paper. At first high-pass filter in wavelet-domain is used as preprocessing. Afterwards VLP is segmented multiscaly from coarse to fine by WHMTM parameter of VLP. So VLP can be located from complex background fast and correctly. Experimental results show this method is very fast and robust.
According to multiscale and accurate characterization of vehicle-license-plate (VLP) texture feature by wavelet hidden Markov tree model (WHMTM), a method of VLP Location based on WHMTM is proposed in this paper. At first high-pass filter in wavelet-domain is used as preprocessing. Afterwards VLP is segmented multiscaly from coarse to fine by WHMTM parameter of VLP. So VLP can be located from complex background fast and correctly. Experimental results show this method is very fast and robust.
2004, 33(5): 519-522.
Abstract:
Aim at the problem that vertical distance cannot be estimated correctly which caused by reflecting signal's phase invertion, a simple method which can automatically detects phase inversion, corrects it and make a uniform image is putted forward.This paper makes a brief description of the arithmetic of the signal processing for SPR. It also discusses how the reflecting signal's phase is affected by the reflecting surface, when the uniform planewave touch the perfect metal or dielectric surface. It proves the validity of the arithmetic, when the real data is processed. So SPR's ability of detection is improved greatly when there is phase invertion.
Aim at the problem that vertical distance cannot be estimated correctly which caused by reflecting signal's phase invertion, a simple method which can automatically detects phase inversion, corrects it and make a uniform image is putted forward.This paper makes a brief description of the arithmetic of the signal processing for SPR. It also discusses how the reflecting signal's phase is affected by the reflecting surface, when the uniform planewave touch the perfect metal or dielectric surface. It proves the validity of the arithmetic, when the real data is processed. So SPR's ability of detection is improved greatly when there is phase invertion.
2004, 33(5): 523-526.
Abstract:
The using of design patterns in EMS system can decrease the complexity and improve the efficiency of system development. By analyzing Singleton pattern, Adapter pattern, Observer patter, the paper discussed their architectures in detail. In advanced, it can provide a theoretical guide to realize system functions with these patterns. In the end, it analyzed why and how to use these patterns to EMS system. The application of design pattern in EMS has been proved to be an efficient way to enhance the quality of EMS.
The using of design patterns in EMS system can decrease the complexity and improve the efficiency of system development. By analyzing Singleton pattern, Adapter pattern, Observer patter, the paper discussed their architectures in detail. In advanced, it can provide a theoretical guide to realize system functions with these patterns. In the end, it analyzed why and how to use these patterns to EMS system. The application of design pattern in EMS has been proved to be an efficient way to enhance the quality of EMS.
2004, 33(5): 527-530.
Abstract:
From perspectives of communication server set and safety, this paper comprehensively analyzes the essentiality for which the resource dynamic trading scheme is applied to active network. Furthermore, this paper puts forward active queue model used as an area for resources dynamic trading in active node, designs resources distribution arithmetic and price function of resources, and lets resources to be shared according to user preferences. At last, a simulation witch used to test the traits of our mechanism such as length of queue, and packet delay time is made under OPNET circumstance. This simulation results indicate that the application makes effective use of the available resources.
From perspectives of communication server set and safety, this paper comprehensively analyzes the essentiality for which the resource dynamic trading scheme is applied to active network. Furthermore, this paper puts forward active queue model used as an area for resources dynamic trading in active node, designs resources distribution arithmetic and price function of resources, and lets resources to be shared according to user preferences. At last, a simulation witch used to test the traits of our mechanism such as length of queue, and packet delay time is made under OPNET circumstance. This simulation results indicate that the application makes effective use of the available resources.
2004, 33(5): 531-534.
Abstract:
Non-repudiation is one of the most important premises to achieve electronic commerce. Based on a trusty third party, this paper proposes a transmission-oriented electronic evidence and non-repudiation protocol transmission-oriented electronic evidence and non-repudiation protocol (TEENP) to resolve the possible repudiation problem both in receiver side and in sender side. We extend the semantics and reasoning rules of the belief logic BAN, and formal analysis of TEENP is presented using logic BAN. The protocol is fair, secure and efficient, compared with the corresponding protocols.
Non-repudiation is one of the most important premises to achieve electronic commerce. Based on a trusty third party, this paper proposes a transmission-oriented electronic evidence and non-repudiation protocol transmission-oriented electronic evidence and non-repudiation protocol (TEENP) to resolve the possible repudiation problem both in receiver side and in sender side. We extend the semantics and reasoning rules of the belief logic BAN, and formal analysis of TEENP is presented using logic BAN. The protocol is fair, secure and efficient, compared with the corresponding protocols.
2004, 33(5): 535-538.
Abstract:
Using mode match matching, the paper at first time analyses the radiation fields of the V-conical antennas with finite length for the first time. This approach is facilitated by dividing the space into two subregions reasonably, thus allowing use of spherical harmonic expansions in each subregion.The expansion coefficients are found by enforcing the continuity condition at the region boundary surface. The methods leads to very good agreements between the theoretical results and the simulated results,which is given by Ansoft HFSS 8.0.The conclusions. of this paper can be used for engineering design of V conical antennas.
Using mode match matching, the paper at first time analyses the radiation fields of the V-conical antennas with finite length for the first time. This approach is facilitated by dividing the space into two subregions reasonably, thus allowing use of spherical harmonic expansions in each subregion.The expansion coefficients are found by enforcing the continuity condition at the region boundary surface. The methods leads to very good agreements between the theoretical results and the simulated results,which is given by Ansoft HFSS 8.0.The conclusions. of this paper can be used for engineering design of V conical antennas.
2004, 33(5): 539-542.
Abstract:
The terminal auto-check signal source of telemeter system is an important part to improve the reliability and maintenance of the whole system. The signal source can output the telemeter signal、data transmission signal, and time-frequency signal, certainly the signal has the ability to get data through the PCI data bus and has the ability to accept the monitor of the main-control computer. The way how to realize the QPSK signal is discussed and give the result of simulation and real test.
The terminal auto-check signal source of telemeter system is an important part to improve the reliability and maintenance of the whole system. The signal source can output the telemeter signal、data transmission signal, and time-frequency signal, certainly the signal has the ability to get data through the PCI data bus and has the ability to accept the monitor of the main-control computer. The way how to realize the QPSK signal is discussed and give the result of simulation and real test.
2004, 33(5): 543-546.
Abstract:
The multi-period ambiguity function of LFMCW radar signal is given, and compared with single-period ambiguity function. Some properties of difference with single-period is discussed, these properties include the multiple-single period PAF,cut along the principal axes and volume limitation. The computer simulation showed that Doppler resolution being higher, but delay resolution is not improved as number of periods increases.
The multi-period ambiguity function of LFMCW radar signal is given, and compared with single-period ambiguity function. Some properties of difference with single-period is discussed, these properties include the multiple-single period PAF,cut along the principal axes and volume limitation. The computer simulation showed that Doppler resolution being higher, but delay resolution is not improved as number of periods increases.
2004, 33(5): 547-550.
Abstract:
In this paper, a set of data collection and magnetic deviation analysis experiments which can simulate different magnetic disturbances are designed based on ellipse-specific fitting error compensation method. Under the condition of diverse magnetic disturbances, ellipse parameter which depict measured data characteristic and the last compensation effect are analyzed in detail. Theoretics expressions are compared and complemented with experiment results. At the same time, the interaction of soft iron and hard iron distortion and the role of each in the whole magnetic heading error are discussed.
In this paper, a set of data collection and magnetic deviation analysis experiments which can simulate different magnetic disturbances are designed based on ellipse-specific fitting error compensation method. Under the condition of diverse magnetic disturbances, ellipse parameter which depict measured data characteristic and the last compensation effect are analyzed in detail. Theoretics expressions are compared and complemented with experiment results. At the same time, the interaction of soft iron and hard iron distortion and the role of each in the whole magnetic heading error are discussed.
2004, 33(5): 551-554,593.
Abstract:
At present paper, we recite the basic principle of plane hot fountain to measure the heat physical property instantly and analysis the problem between the instant measurement and pulse measurement. basic on this, We study the instant automatic measurement technology of the heat physical property. Our practice indicated that instant automatic measurement is exact and credible, accord with the result of plane heat measurment well.
At present paper, we recite the basic principle of plane hot fountain to measure the heat physical property instantly and analysis the problem between the instant measurement and pulse measurement. basic on this, We study the instant automatic measurement technology of the heat physical property. Our practice indicated that instant automatic measurement is exact and credible, accord with the result of plane heat measurment well.
2004, 33(5): 555-558.
Abstract:
Dual-hosts sytem providing high availability(HA), which is the one of most important method for data integrity and service continuous, is widely required for user.The principle, deployment and framework of a dual-hosts system is introduced, and a turing machine of the dual-hosts system is presented in this paper.The turing machine simulates the dual-hosts system and describes the states transition of the dual-hosts system and supplies a theory basis for designing architecture of the dual-hosts system.
Dual-hosts sytem providing high availability(HA), which is the one of most important method for data integrity and service continuous, is widely required for user.The principle, deployment and framework of a dual-hosts system is introduced, and a turing machine of the dual-hosts system is presented in this paper.The turing machine simulates the dual-hosts system and describes the states transition of the dual-hosts system and supplies a theory basis for designing architecture of the dual-hosts system.
2004, 33(5): 559-561.
Abstract:
The realize of a developing pattern's designing and developing,which is based of EJB, has resolve the storage problem of object,and comparing with the same type of product,it has serveral advantages,such as easy manipulate,simple structure and it makes the develop of using EJB more transparency to programmer, so it could make the developing easier.This paper also present a method to solve the problem of O/R Mapping.PERO is not an new frame of EJB,but an frame based_on EJB.
The realize of a developing pattern's designing and developing,which is based of EJB, has resolve the storage problem of object,and comparing with the same type of product,it has serveral advantages,such as easy manipulate,simple structure and it makes the develop of using EJB more transparency to programmer, so it could make the developing easier.This paper also present a method to solve the problem of O/R Mapping.PERO is not an new frame of EJB,but an frame based_on EJB.
2004, 33(5): 562-565.
Abstract:
We present a novel load-balancing algorithm to the distributed system. In the algorithm, tasks are classified by the resource which they would take up later. While scheduling, every node's load is calculated dynamically through the task type and the resource's overhead collected periodically. Then a suitable node is found to the task in a subset of the whole nodes. The algorithm can remove the herd effect caused by delayed information, and can decrease the mean response time of a few tasks that have special requirement in this regard. It has been adopted in a distributed operation system developed by our group.
We present a novel load-balancing algorithm to the distributed system. In the algorithm, tasks are classified by the resource which they would take up later. While scheduling, every node's load is calculated dynamically through the task type and the resource's overhead collected periodically. Then a suitable node is found to the task in a subset of the whole nodes. The algorithm can remove the herd effect caused by delayed information, and can decrease the mean response time of a few tasks that have special requirement in this regard. It has been adopted in a distributed operation system developed by our group.
2004, 33(5): 566-569.
Abstract:
The present paper summarizes the one-to-many matching model of bipartite model and corresponding methodology formalized in the process of extending a content-based load sharing algorithm, LARD. Such a one-to-many matching is referred to as k-perfect matching, and a charity algorithm is given as the solution. Some experimental results for the matching based on charity algorithm are then presented, with open issues and potential applicability in the context of hyper graph left as discussions.
The present paper summarizes the one-to-many matching model of bipartite model and corresponding methodology formalized in the process of extending a content-based load sharing algorithm, LARD. Such a one-to-many matching is referred to as k-perfect matching, and a charity algorithm is given as the solution. Some experimental results for the matching based on charity algorithm are then presented, with open issues and potential applicability in the context of hyper graph left as discussions.
2004, 33(5): 570-572,593.
Abstract:
There are two ways of using object model.One way is, generally, accessing object model by the relation of the object, another way is, according to Relation theory, accessing or saving data by connecting tables or copying columns or rows. As the basal difference mentioned above,the integrate of two function is far from perfect. It is not match between OO design and relation data base design.So we need a mapping method——O/R Mapping to solve the inconsistency to get a successful design.
There are two ways of using object model.One way is, generally, accessing object model by the relation of the object, another way is, according to Relation theory, accessing or saving data by connecting tables or copying columns or rows. As the basal difference mentioned above,the integrate of two function is far from perfect. It is not match between OO design and relation data base design.So we need a mapping method——O/R Mapping to solve the inconsistency to get a successful design.
2004, 33(5): 573-576.
Abstract:
It is well known that, counter propagation network is fitful for pattern classification. According to such attribute, we present a face recognition algorithm based on counter propagation network. Meanwhile, we modify the learning method of counter propagation network in case of its instability during the training phase, and do some experiments with ORL face library that is international universal. Experiments show that we can achieve sound result by choosing parameters appropriately. So, the recognition algorithm based on counter propagation network is effective and practicable.
It is well known that, counter propagation network is fitful for pattern classification. According to such attribute, we present a face recognition algorithm based on counter propagation network. Meanwhile, we modify the learning method of counter propagation network in case of its instability during the training phase, and do some experiments with ORL face library that is international universal. Experiments show that we can achieve sound result by choosing parameters appropriately. So, the recognition algorithm based on counter propagation network is effective and practicable.
2004, 33(5): 577-581.
Abstract:
A model identification approach of nonlinear systems where only the input-output data of the identified system are available is presented. To automatically acquire the fuzzy rule-base and the initial parameters of the fuzzy model, an unsupervised clustering method is used in structure identification. Based on the cluster result, a Fuzzy Neural Network (FNN) is constructed to match with it. The FNN is trained by its learning algorithm to obtain a precise fuzzy model and realize parameter identification. Finally, the effectiveness of the proposed technique is confirmed by the simulation results of two nonlinear systems.
A model identification approach of nonlinear systems where only the input-output data of the identified system are available is presented. To automatically acquire the fuzzy rule-base and the initial parameters of the fuzzy model, an unsupervised clustering method is used in structure identification. Based on the cluster result, a Fuzzy Neural Network (FNN) is constructed to match with it. The FNN is trained by its learning algorithm to obtain a precise fuzzy model and realize parameter identification. Finally, the effectiveness of the proposed technique is confirmed by the simulation results of two nonlinear systems.
2004, 33(5): 582-585.
Abstract:
This paper proposes a novel structure of fuzzy stator direct torque control for induction motor with fuzzy stator resistance estimator. Fuzzy logic is used for estimating the stator resistance and choosing the switching state, which can improve the performance at low speeds and the response of the system. Also the paper uses MATLAB/SIMULINK to build the simulating model of the system. Some simulating result is presented to demonstrate this model is true, and the method has the advantage to study in the engineer.
This paper proposes a novel structure of fuzzy stator direct torque control for induction motor with fuzzy stator resistance estimator. Fuzzy logic is used for estimating the stator resistance and choosing the switching state, which can improve the performance at low speeds and the response of the system. Also the paper uses MATLAB/SIMULINK to build the simulating model of the system. Some simulating result is presented to demonstrate this model is true, and the method has the advantage to study in the engineer.
2004, 33(5): 586-589.
Abstract:
A dc/dc converter control scheme based on chaos is proposed, which can improves electromagnetic compatibility of dc/dc power supply. Firstly an expression of Logistic map is derived, which can generated chaotic sequences with controllable amplitudes. Then a chaotic sequence is applied to perturbs reference current parameter in hysteresis current control scheme. Power spectrum of inductance current is spread and electromagnetic interference on switching frequency and its harmonic frequency is reduced. Simulation results show that the new scheme can improve electromagnetic compatibility of the dc/dc converter.
A dc/dc converter control scheme based on chaos is proposed, which can improves electromagnetic compatibility of dc/dc power supply. Firstly an expression of Logistic map is derived, which can generated chaotic sequences with controllable amplitudes. Then a chaotic sequence is applied to perturbs reference current parameter in hysteresis current control scheme. Power spectrum of inductance current is spread and electromagnetic interference on switching frequency and its harmonic frequency is reduced. Simulation results show that the new scheme can improve electromagnetic compatibility of the dc/dc converter.
2004, 33(5): 590-593.
Abstract:
In this paper a new concept of phase contrail of phase plane for higher order nonlinear control system based on isoclines method of second-order linear system is proposed. It features simplicity in calculation, higher precision in consequence compared with analytic method.It can be applied generalized to solve non-linear difference equation.The results of example show that algorithm is effective.
In this paper a new concept of phase contrail of phase plane for higher order nonlinear control system based on isoclines method of second-order linear system is proposed. It features simplicity in calculation, higher precision in consequence compared with analytic method.It can be applied generalized to solve non-linear difference equation.The results of example show that algorithm is effective.
High Luminance and High Resolution MAO Phosphor Screens Used in 12.7 cm Projection Cathode Ray Tubes
2004, 33(5): 594-596,610.
Abstract:
A new kind of MAO phosphor screen has been successfully developed for the 12.7 cm projection cathode ray tube (CRT) by depositing phosphor powder on MAO faceplate with centrifugal sedimentation technique. The five inches MAO projection CRTs have high luminance, high resolution, high contrast, and long life. A 129 cm rear projection TV incorporation these new CRTs show a luminous output more than 2 000 lm, a resolution of more than 1 800 TV lines(CRT), a contrast of more than 150 (Write/Black).
A new kind of MAO phosphor screen has been successfully developed for the 12.7 cm projection cathode ray tube (CRT) by depositing phosphor powder on MAO faceplate with centrifugal sedimentation technique. The five inches MAO projection CRTs have high luminance, high resolution, high contrast, and long life. A 129 cm rear projection TV incorporation these new CRTs show a luminous output more than 2 000 lm, a resolution of more than 1 800 TV lines(CRT), a contrast of more than 150 (Write/Black).
2004, 33(5): 597-599,610.
Abstract:
The general CAD adopts opening frame system and provides corresponding means and methods of the further development. This article studies the object-oriented method and technology of the further development, expecting offer direction of further development methods. An example is illustrated the application of object-oriented technique to the further development of parametric design by means of Pro/Toolkit (developer kit of Pro/E).
The general CAD adopts opening frame system and provides corresponding means and methods of the further development. This article studies the object-oriented method and technology of the further development, expecting offer direction of further development methods. An example is illustrated the application of object-oriented technique to the further development of parametric design by means of Pro/Toolkit (developer kit of Pro/E).
2004, 33(5): 600-603.
Abstract:
Base on the actuality of green produce make a price research, start form sufficient competition and information opening and mass data offered by the network. Put forward the reason of introduce the state space model of the ARIMA process, through the express of its state space model and Kalman filter relation for forecast, discuss the likelihood function and fresh interest means which based on state space model, probe into exact forecast means of the state space model of the ARIMA process.To develop green farm produce energetically, improve the income structure of farms, the produce of our country break the "green bulwark" of export, has active theoretic and realism meaning.
Base on the actuality of green produce make a price research, start form sufficient competition and information opening and mass data offered by the network. Put forward the reason of introduce the state space model of the ARIMA process, through the express of its state space model and Kalman filter relation for forecast, discuss the likelihood function and fresh interest means which based on state space model, probe into exact forecast means of the state space model of the ARIMA process.To develop green farm produce energetically, improve the income structure of farms, the produce of our country break the "green bulwark" of export, has active theoretic and realism meaning.
2004, 33(5): 604-607.
Abstract:
Based on multiple-input-multiple-output (MIMO) scattering wireless fading channel model, a dynamic receiving and transmitting model for MIMO wireless channels is proposed in this paper, which is used for analyzing impact of mobility of transceiver antennas on spatial correlation and capacity of MIMO wireless channels. The conclusion is reached, which these effects are determined by the original positions of transceiver antennas and by their velocity. The simulation results validate this impact and show that there exists an optimum angular spread that forces spatial correlation, which decreases with increasing antenna spacing and does not consistently decrease with increasing angular spread, to reach minimum.
Based on multiple-input-multiple-output (MIMO) scattering wireless fading channel model, a dynamic receiving and transmitting model for MIMO wireless channels is proposed in this paper, which is used for analyzing impact of mobility of transceiver antennas on spatial correlation and capacity of MIMO wireless channels. The conclusion is reached, which these effects are determined by the original positions of transceiver antennas and by their velocity. The simulation results validate this impact and show that there exists an optimum angular spread that forces spatial correlation, which decreases with increasing antenna spacing and does not consistently decrease with increasing angular spread, to reach minimum.
2004, 33(5): 608-610.
Abstract:
This paper deals with the exponential asymptotic stability of neutral integro-differential equations with infinite delays, and some criteria are given for the exponential asymptotic stability by using the method of variation of paramefers. The results obtained here are illustrated by a example which has been particularly difficult to treat by means of the standard Lyapunov theory.
This paper deals with the exponential asymptotic stability of neutral integro-differential equations with infinite delays, and some criteria are given for the exponential asymptotic stability by using the method of variation of paramefers. The results obtained here are illustrated by a example which has been particularly difficult to treat by means of the standard Lyapunov theory.
2004, 33(5): 611-613.
Abstract:
According to the perfection to supply information by rough set decision table, the reliabilities of decision table and reduction of decision table are compared on the definition of reliability. Then we draw the contusion that reduction of decision table is superior in reliability to decision table. It is an analytical tool for the implication of rough set theory.
According to the perfection to supply information by rough set decision table, the reliabilities of decision table and reduction of decision table are compared on the definition of reliability. Then we draw the contusion that reduction of decision table is superior in reliability to decision table. It is an analytical tool for the implication of rough set theory.
2004, 33(5): 614-617.
Abstract:
In this paper, a fast algorithm for calculating the inverse of partitioned matrix with resultant matrix blocks is presented by the polynomial fast algorithm for finding the inverse of resultant matrix. There is only error of approximation when the fast algorithm is realized by computers, and only the elements in the first row of partitioned matrix with resultant matrix blocks is used by the fast algorithm, so the result of the computation is accurate in theory. Finally, numerical examples are given.
In this paper, a fast algorithm for calculating the inverse of partitioned matrix with resultant matrix blocks is presented by the polynomial fast algorithm for finding the inverse of resultant matrix. There is only error of approximation when the fast algorithm is realized by computers, and only the elements in the first row of partitioned matrix with resultant matrix blocks is used by the fast algorithm, so the result of the computation is accurate in theory. Finally, numerical examples are given.
2004, 33(5): 618-620.
Abstract:
Maximum likelihood estimate is discussed in case both parameter r and p of Pascal distribution are unknown.. The result shows that maximum likelihood estimate of r can transfer to a solution of the transcendental equation. There is strong consistency to use the solution from estimation of r. The confidence interval of r and p in the big sample is introduced. The rationality of estimated method is proved from the real sample.
Maximum likelihood estimate is discussed in case both parameter r and p of Pascal distribution are unknown.. The result shows that maximum likelihood estimate of r can transfer to a solution of the transcendental equation. There is strong consistency to use the solution from estimation of r. The confidence interval of r and p in the big sample is introduced. The rationality of estimated method is proved from the real sample.
2004, 33(5): 621-622,626.
Abstract:
To seek for Boolean continuous optimization function in the sp netwoork strueture, in certauin cases, is a combinational optimal problem. Using the method integrating probability theory with operationed research and analysis, the problem is tansformed into the solution of linear and nonlinear programming of continuous functions. As result, the proof of existemce and uniqueness of Booleoon continuous optimizetion funetion is proposed in this paper.
To seek for Boolean continuous optimization function in the sp netwoork strueture, in certauin cases, is a combinational optimal problem. Using the method integrating probability theory with operationed research and analysis, the problem is tansformed into the solution of linear and nonlinear programming of continuous functions. As result, the proof of existemce and uniqueness of Booleoon continuous optimizetion funetion is proposed in this paper.
2004, 33(5): 623-626.
Abstract:
Under the classical mechanics frame, this paper derive the expression of momentum theorem and deliberate the condition of momentum conservation in a general non-inertial frame, in translation and rotational motion. Then this paper formulize the cognition of momentum conservation on "close system" through surveying the motion in a system that hasn't any interaction with outside force in non-inertial system. As a result, it is pointed out clearly that since inertia force takes the role similar to outside force, therefore, closed system does not exist relative to non-inertia system.
Under the classical mechanics frame, this paper derive the expression of momentum theorem and deliberate the condition of momentum conservation in a general non-inertial frame, in translation and rotational motion. Then this paper formulize the cognition of momentum conservation on "close system" through surveying the motion in a system that hasn't any interaction with outside force in non-inertial system. As a result, it is pointed out clearly that since inertia force takes the role similar to outside force, therefore, closed system does not exist relative to non-inertia system.
