ISSN 
2005 Vol. 34, No. 5
2005, 34(5): 577-580.
Abstract:
The wireless communication system is up against various engineering challenges. For both the transmitted and the received data processing, fast-access memories with large capacity are required in experimentation systems with Multiple-Input & Multiple-Output technique. SDRAM is a kind of random access memory with large-capacity and high-speed, but many Microprogrammed Control Units or normal Digital Signal Processors cannot directly interface with SDRAM due to the differences between control signals. Based on FPGA(field programmable gate array), a design method of SDRAM controller with USB interface to computer is proposed. Large-capacity data access is implemented at high speed by the controller circuit, which is working effectively in our MIMO experimentation system.
The wireless communication system is up against various engineering challenges. For both the transmitted and the received data processing, fast-access memories with large capacity are required in experimentation systems with Multiple-Input & Multiple-Output technique. SDRAM is a kind of random access memory with large-capacity and high-speed, but many Microprogrammed Control Units or normal Digital Signal Processors cannot directly interface with SDRAM due to the differences between control signals. Based on FPGA(field programmable gate array), a design method of SDRAM controller with USB interface to computer is proposed. Large-capacity data access is implemented at high speed by the controller circuit, which is working effectively in our MIMO experimentation system.
2005, 34(5): 581-584.
Abstract:
There are two important problem in the research of time-frequency distribution, which are restraining the cross terms and amending the resolutions of the time domain and the frequency domain. A new and predominant performance quadratic time-frequency kernel is presented in this paper. The new kernel can well restraining the cross terms compared with the WVD and the BD. And it has a good performance in the time domain and the frequency domain together.
There are two important problem in the research of time-frequency distribution, which are restraining the cross terms and amending the resolutions of the time domain and the frequency domain. A new and predominant performance quadratic time-frequency kernel is presented in this paper. The new kernel can well restraining the cross terms compared with the WVD and the BD. And it has a good performance in the time domain and the frequency domain together.
2005, 34(5): 585-588.
Abstract:
The principle of self-encoded spread spectrum communication is introduced. AR-SESS system which employs AR filter technique to obtain the spreading codes from the source sequences is proposed. And the paper analyzes and simulates the performance of Bit-Error-Rate (BER) and the multiple access capability of this system. The analysis and simulation show that AR-SESS improves the BER performance of the conventional SESS system and enhance the performance of the multiple accesses. It provides a good choice for the practical application of the SESS system.
The principle of self-encoded spread spectrum communication is introduced. AR-SESS system which employs AR filter technique to obtain the spreading codes from the source sequences is proposed. And the paper analyzes and simulates the performance of Bit-Error-Rate (BER) and the multiple access capability of this system. The analysis and simulation show that AR-SESS improves the BER performance of the conventional SESS system and enhance the performance of the multiple accesses. It provides a good choice for the practical application of the SESS system.
2005, 34(5): 589-592.
Abstract:
This paper shows a new routing strategy for Ad-hoc Network which introduces UWB positioning to routing process. With the topology of whole network obtained from UWB positioning, we treat the distance between nodes as one of the main metrics and thus limit the broadcast scope of the routing request packets while route discovery period, which results in the significant reduction in routing packets flooding. The validity of the algorithm presented in the paper is tested by OPNET at last.
This paper shows a new routing strategy for Ad-hoc Network which introduces UWB positioning to routing process. With the topology of whole network obtained from UWB positioning, we treat the distance between nodes as one of the main metrics and thus limit the broadcast scope of the routing request packets while route discovery period, which results in the significant reduction in routing packets flooding. The validity of the algorithm presented in the paper is tested by OPNET at last.
2005, 34(5): 593-595.
Abstract:
A new improved optimization method is promoted based on common minimum-maximum principle for implementation of the filter bank of MTD radar. This new method has clearly physical signification, which is to minimize the output power of the clutter. In this way, it can change the optimization function to a minimal function. It reduces the complexity of solution the optimization problem. In this paper, the steepest descent arithmetic is used. The computer simulations results show that it is approximate to the common ones. The new method is a viable way in engineering applications.
A new improved optimization method is promoted based on common minimum-maximum principle for implementation of the filter bank of MTD radar. This new method has clearly physical signification, which is to minimize the output power of the clutter. In this way, it can change the optimization function to a minimal function. It reduces the complexity of solution the optimization problem. In this paper, the steepest descent arithmetic is used. The computer simulations results show that it is approximate to the common ones. The new method is a viable way in engineering applications.
2005, 34(5): 596-599.
Abstract:
In the future, using mobile station to locate is the trend of the mobile communication. There are many scholars research in this technology and hold up a great amount of location methods. But many of methods only are fit for location of the mobile station which is in the quiescent state. And when the mobile station is in the dislocation state, these methods would occur fair-sized error. This paper holds up a location track arithmetic which bases on Markov chain cooperating to correlation detection range gate and derives the implementation method of the location track arithmetic. Theoretical analysis and simulation result shows that this location track arithmetic could implement location of the mobile station not only in the dislocation state but also in the quiescent state and improve location accuracy.
In the future, using mobile station to locate is the trend of the mobile communication. There are many scholars research in this technology and hold up a great amount of location methods. But many of methods only are fit for location of the mobile station which is in the quiescent state. And when the mobile station is in the dislocation state, these methods would occur fair-sized error. This paper holds up a location track arithmetic which bases on Markov chain cooperating to correlation detection range gate and derives the implementation method of the location track arithmetic. Theoretical analysis and simulation result shows that this location track arithmetic could implement location of the mobile station not only in the dislocation state but also in the quiescent state and improve location accuracy.
2005, 34(5): 600-602,675.
Abstract:
This paper discusses the effects of sampling rate on LFM pulse compression when LFM I/Q Quadrature signals are sampled. The theoretical analysis has proved that in the condition of under-sampling, because the paired echoes will be appeared, the system's multi-object resolution will be affected. In the other hand, after pulse compression processing, the output signal's main lobe will be extended and its amplitude or phase will be modulated, and the range resolution will descend too. Finally, some simulation results have been displayed.
This paper discusses the effects of sampling rate on LFM pulse compression when LFM I/Q Quadrature signals are sampled. The theoretical analysis has proved that in the condition of under-sampling, because the paired echoes will be appeared, the system's multi-object resolution will be affected. In the other hand, after pulse compression processing, the output signal's main lobe will be extended and its amplitude or phase will be modulated, and the range resolution will descend too. Finally, some simulation results have been displayed.
2005, 34(5): 603-606.
Abstract:
In this paper it is introduced in detail that radar pulse compression system control unit is successfully designed by using the powerful serial peripheral interface of ADI's fixed-point 16-bit digital signal processor ADSP-2191 and combining the CPLD function expansion and control. It has realized to control six pulse compression board with host computer. Furthermore, it can also control each board to process corresponding compression pulse and report the board fault status to host computer. Owing to the fast speed, low cost, powerful programmable capability, it can be widely applied to require all kind of complicated control and real time communication area.
In this paper it is introduced in detail that radar pulse compression system control unit is successfully designed by using the powerful serial peripheral interface of ADI's fixed-point 16-bit digital signal processor ADSP-2191 and combining the CPLD function expansion and control. It has realized to control six pulse compression board with host computer. Furthermore, it can also control each board to process corresponding compression pulse and report the board fault status to host computer. Owing to the fast speed, low cost, powerful programmable capability, it can be widely applied to require all kind of complicated control and real time communication area.
2005, 34(5): 607-610.
Abstract:
This article mainly deal with following topics:presenting an effective solution for the radar to communicate with remote terminals through Ethernet PHY chip and single mode fiber, discussing the system architecture and the communication protocol, and its realization with field programmable gate array. Since the system has such advantages such as high reliability and easy to be implemented, it is to be put into wide usage in RADAR remote communication.
This article mainly deal with following topics:presenting an effective solution for the radar to communicate with remote terminals through Ethernet PHY chip and single mode fiber, discussing the system architecture and the communication protocol, and its realization with field programmable gate array. Since the system has such advantages such as high reliability and easy to be implemented, it is to be put into wide usage in RADAR remote communication.
2005, 34(5): 611-613,664.
Abstract:
During parameters estimation of the distributed source, there are many errors if it is modeled as a point case in space. The generalized high resolution algorithms, estimating the distributed source parameters, normally demand complex computation, and the angular distributed function is known. To reduce the computational complexity greatly, the correlation algorithm is proposed for the coherent distributed source parameters estimation using the special geometry structure of signal receiving antenna array, and the ambiguity of DOA estimation is also analyzed. Computer simulation testifies the validity of this algorithm.
During parameters estimation of the distributed source, there are many errors if it is modeled as a point case in space. The generalized high resolution algorithms, estimating the distributed source parameters, normally demand complex computation, and the angular distributed function is known. To reduce the computational complexity greatly, the correlation algorithm is proposed for the coherent distributed source parameters estimation using the special geometry structure of signal receiving antenna array, and the ambiguity of DOA estimation is also analyzed. Computer simulation testifies the validity of this algorithm.
2005, 34(5): 614-617.
Abstract:
The responsive deception for spaceborne SAR is studied and improved. The algorithm is got by analyzing the range domain and cross-range domain respectively. This algorithm provides high precision compress of cheat targets. And merely need the estimation of few radar parameters as:Dopppler frequency rate from the echoes, radar velocity and radar pulse repeat frequency. The demand of the precision of parameters is analyzed and the result shows that the request is little. The method of the estimation of Doppler frequency rate is worked out. The correctness of theoretic analyze and the validity of the algorithm are proved by computer simulation. The algorithm is of good signification for the theory and the practice of jamming signal production.
The responsive deception for spaceborne SAR is studied and improved. The algorithm is got by analyzing the range domain and cross-range domain respectively. This algorithm provides high precision compress of cheat targets. And merely need the estimation of few radar parameters as:Dopppler frequency rate from the echoes, radar velocity and radar pulse repeat frequency. The demand of the precision of parameters is analyzed and the result shows that the request is little. The method of the estimation of Doppler frequency rate is worked out. The correctness of theoretic analyze and the validity of the algorithm are proved by computer simulation. The algorithm is of good signification for the theory and the practice of jamming signal production.
2005, 34(5): 618-621.
Abstract:
The control method of state modulator is used to control chaos in the paper. The state controller is constructed on the basis of the system equation in the presence of noise interference and used to control the chaotic Lorenz system interfered by measure and input noise. As the operation range of state observation is changed, the method can stabilize the original equilibrium point or stabilize the systems to the new equilibrium point. The simulation results prove that the method is effective.
The control method of state modulator is used to control chaos in the paper. The state controller is constructed on the basis of the system equation in the presence of noise interference and used to control the chaotic Lorenz system interfered by measure and input noise. As the operation range of state observation is changed, the method can stabilize the original equilibrium point or stabilize the systems to the new equilibrium point. The simulation results prove that the method is effective.
2005, 34(5): 622-625.
Abstract:
An approach to realize the multi-radar signal simulator by using TMS320C6416 is presented in this paper. In order to achieve arranging the pulse in time order,the time of pulse arriving is mapped to the address of memory, the RF pulse model of radar is also be described。The process of digital signal processing software designing is discussed in succession. If two pulses are arrived at same time, we select the pulse which priority level is high.With the design,the dense radar signal environment can be made vividly.
An approach to realize the multi-radar signal simulator by using TMS320C6416 is presented in this paper. In order to achieve arranging the pulse in time order,the time of pulse arriving is mapped to the address of memory, the RF pulse model of radar is also be described。The process of digital signal processing software designing is discussed in succession. If two pulses are arrived at same time, we select the pulse which priority level is high.With the design,the dense radar signal environment can be made vividly.
2005, 34(5): 626-629.
Abstract:
In this paper, we analyze the problem that we must implement the interconnection of IPv4 and IPv6 network while decrease the consumption of the IPv4 addresses when we employed IPv6 on Backbone. Then, based on the comparison of several issues of IPv4/IPv6 transition, we provided a suggestion that we can integrate a NAPT-PT system in the gateway on the edge of IPv4 and IPv6 net. Additionally, we introduced the shortcoming of the NAPT-PT system on the MAN and the key to them in the realization.
In this paper, we analyze the problem that we must implement the interconnection of IPv4 and IPv6 network while decrease the consumption of the IPv4 addresses when we employed IPv6 on Backbone. Then, based on the comparison of several issues of IPv4/IPv6 transition, we provided a suggestion that we can integrate a NAPT-PT system in the gateway on the edge of IPv4 and IPv6 net. Additionally, we introduced the shortcoming of the NAPT-PT system on the MAN and the key to them in the realization.
2005, 34(5): 630-633.
Abstract:
A three-dimensional (3D) nonlinear theory of traveling wave tubes (TWTs) is developed, which includes fundamental radio frequency (RF) and harmonic. When the instantaneous bandwidth exceeds octave, the harmonic is generated and the mutual coupling between harmonic and fundamental RF can be observed in TWTs due to nonlinear interaction between electron beam and RF. At low frequencies the harmonic has an obvious effect. Based upon Tien's disc model, a plastic 3D super-particle model is proposed to improve the nonlinear analysis of TWT. Numerical results by employing a periodic magnetic focusing field are presented including voltage sinking.
A three-dimensional (3D) nonlinear theory of traveling wave tubes (TWTs) is developed, which includes fundamental radio frequency (RF) and harmonic. When the instantaneous bandwidth exceeds octave, the harmonic is generated and the mutual coupling between harmonic and fundamental RF can be observed in TWTs due to nonlinear interaction between electron beam and RF. At low frequencies the harmonic has an obvious effect. Based upon Tien's disc model, a plastic 3D super-particle model is proposed to improve the nonlinear analysis of TWT. Numerical results by employing a periodic magnetic focusing field are presented including voltage sinking.
2005, 34(5): 634-637.
Abstract:
A mobile agent distributed intrusion detection system(MADIDS) repairing mechanism based on mobile agent is introduced in this paper. MADIDS is special designed for WAN environment. MADIDS Data is calculated by distributed agent at every node. Not only has it carried out a intrusion detection at network range and a well migrate character, but also there is possibility of lowering network bottleneck because of the low cost of network system and host computer resource. Restorability and Invulnerability at every layer of the system has discussed in this paper. Experiment proved that this mechanism is displaying a well performance.
A mobile agent distributed intrusion detection system(MADIDS) repairing mechanism based on mobile agent is introduced in this paper. MADIDS is special designed for WAN environment. MADIDS Data is calculated by distributed agent at every node. Not only has it carried out a intrusion detection at network range and a well migrate character, but also there is possibility of lowering network bottleneck because of the low cost of network system and host computer resource. Restorability and Invulnerability at every layer of the system has discussed in this paper. Experiment proved that this mechanism is displaying a well performance.
2005, 34(5): 638-641.
Abstract:
Based on the analysis of the principle of MVC design pattern and MVC architecture, this paper discussed the application of MVC design pattern in NMS system development. An example is given to discuss how to use patterns in designing NMS and the structure of framework is illustrated. This design can not only make the logic processing procedure clearer, but also make the later expansion and maintenance easier. It can be applied facilely to the design of other application module of client, and bring better software architecture and reusability of code.
Based on the analysis of the principle of MVC design pattern and MVC architecture, this paper discussed the application of MVC design pattern in NMS system development. An example is given to discuss how to use patterns in designing NMS and the structure of framework is illustrated. This design can not only make the logic processing procedure clearer, but also make the later expansion and maintenance easier. It can be applied facilely to the design of other application module of client, and bring better software architecture and reusability of code.
2005, 34(5): 642-645.
Abstract:
As SPKI technology has advantage on the aspect of authorization, this paper presents an access control system for large multicast system named MDAC based on SPKI and MDAC authentication and authorization protocol was also designed. Experiment of simulation and performance evaluation was also done. Compared with other solutions, MDAC has not only excellent performance, but also characteristics of distribution, supporting asymmetrical multicast, delegation and privacy protection, less computing cost in border router.
As SPKI technology has advantage on the aspect of authorization, this paper presents an access control system for large multicast system named MDAC based on SPKI and MDAC authentication and authorization protocol was also designed. Experiment of simulation and performance evaluation was also done. Compared with other solutions, MDAC has not only excellent performance, but also characteristics of distribution, supporting asymmetrical multicast, delegation and privacy protection, less computing cost in border router.
2005, 34(5): 646-649.
Abstract:
Distributed parallel database system is increasingly concerned because of its characteristics, high-availability, high-efficiency and so on. Distributed redirection algorithm has been presented to accomplish the transparent switch of the node that a client has created connection with, according to the characteristics of the distributed parallel database system. The algorithm has not only accomplished system load balance and location transparency, and enhanced the system efficiency, but also ensured that the transaction don't be interrupted when the node fault occurred, and enhanced the system availability.
Distributed parallel database system is increasingly concerned because of its characteristics, high-availability, high-efficiency and so on. Distributed redirection algorithm has been presented to accomplish the transparent switch of the node that a client has created connection with, according to the characteristics of the distributed parallel database system. The algorithm has not only accomplished system load balance and location transparency, and enhanced the system efficiency, but also ensured that the transaction don't be interrupted when the node fault occurred, and enhanced the system availability.
2005, 34(5): 650-653.
Abstract:
Based on the analysis of the safety related ARINC653 specification, an scheme of embedded real time operating system being suitable for safety critical applications:S-CRTOS, is proposed in this paper. The principle of isolation and protection is introduced in details, and several critical technologies:partition schedule, process pool and asynonous mechanism, are also described. This design has been implemented at some target boards, and can be used for safety critical systems:avionics electronics and automobile electronics etc.
Based on the analysis of the safety related ARINC653 specification, an scheme of embedded real time operating system being suitable for safety critical applications:S-CRTOS, is proposed in this paper. The principle of isolation and protection is introduced in details, and several critical technologies:partition schedule, process pool and asynonous mechanism, are also described. This design has been implemented at some target boards, and can be used for safety critical systems:avionics electronics and automobile electronics etc.
2005, 34(5): 654-656,712.
Abstract:
This paper examines the issues which must be solved while creating simulating workload, presents the design of a workload generator and analyses the performances of the implementations using three different event-drived models, select, poll and epoll, respectively. The test result shows that the workload generator using epoll model achieves the best performance.
This paper examines the issues which must be solved while creating simulating workload, presents the design of a workload generator and analyses the performances of the implementations using three different event-drived models, select, poll and epoll, respectively. The test result shows that the workload generator using epoll model achieves the best performance.
2005, 34(5): 657-660.
Abstract:
The network manufacturing system for optimally allocating and restructuring manufacturing resources is an important part and evolution of Chengdu-Deyang-Mianyang Region's manufacturing industry. Manufacturing resource modeling of this system is necessary and valuable. In the paper, manufacturing resource characteristics of this system are analyzed, the modeling requirements of manufacturing resource for this system are researched, modeling process using object-oriented is then analyzed. Based on above work, the two-level manufacturing resource model based on UML is set up. The two-level model has an important reference for other resource model and it can support regional network manufacturing system well.
The network manufacturing system for optimally allocating and restructuring manufacturing resources is an important part and evolution of Chengdu-Deyang-Mianyang Region's manufacturing industry. Manufacturing resource modeling of this system is necessary and valuable. In the paper, manufacturing resource characteristics of this system are analyzed, the modeling requirements of manufacturing resource for this system are researched, modeling process using object-oriented is then analyzed. Based on above work, the two-level manufacturing resource model based on UML is set up. The two-level model has an important reference for other resource model and it can support regional network manufacturing system well.
2005, 34(5): 661-664.
Abstract:
In this paper, minimization of total variation has been proposed via level set equation and average curvature flow has been substituted with Min/Max curvature flow. This method can preserve the main structure of image, smoothing noise and removing discrete cosine transform blocking effects. The experimental results indicate that the proposed method has better perform of vision and segmentation than average filter.
In this paper, minimization of total variation has been proposed via level set equation and average curvature flow has been substituted with Min/Max curvature flow. This method can preserve the main structure of image, smoothing noise and removing discrete cosine transform blocking effects. The experimental results indicate that the proposed method has better perform of vision and segmentation than average filter.
2005, 34(5): 665-668.
Abstract:
Taking advantages of the multiresolution feature of wavelet transform and the property of human visual system, a multi-Signature watermarking algorithm for color image is presented here. With this algorithm, the multi-signature watermarks are mixed with the chaotic sequences and spread over the different wavelet domains of RGB color spaces of the image. The watermarked image is obtained by using the inverse wavelet transform. Multi-watermarking system can be a valid way of ownership identification, and can achieve good transparency and robustness. Experimental results and analysis are given to demonstrate that the proposed algorithm is extremely robust to common image processing such as noise addition, cropping, median filtering, and JPEG compression. Moreover, if the watermarked color image is converted into the gray image, the signature watermarks can still be detected.
Taking advantages of the multiresolution feature of wavelet transform and the property of human visual system, a multi-Signature watermarking algorithm for color image is presented here. With this algorithm, the multi-signature watermarks are mixed with the chaotic sequences and spread over the different wavelet domains of RGB color spaces of the image. The watermarked image is obtained by using the inverse wavelet transform. Multi-watermarking system can be a valid way of ownership identification, and can achieve good transparency and robustness. Experimental results and analysis are given to demonstrate that the proposed algorithm is extremely robust to common image processing such as noise addition, cropping, median filtering, and JPEG compression. Moreover, if the watermarked color image is converted into the gray image, the signature watermarks can still be detected.
2005, 34(5): 669-671.
Abstract:
In this paper, based on Support Vector Machine (SVM), we introduce a semi-supervised learning algorithm for image retrieval. The basic consideration of the algorithm is that, if two data points are close to each other, they should share the same label. Therefore, it is reasonable to search a projection with maximal margin and locality preserving property. Comparing our algorithm to standard SVM and transductive SVM, Experimental results show efficiency and effectiveness of our algorithm.
In this paper, based on Support Vector Machine (SVM), we introduce a semi-supervised learning algorithm for image retrieval. The basic consideration of the algorithm is that, if two data points are close to each other, they should share the same label. Therefore, it is reasonable to search a projection with maximal margin and locality preserving property. Comparing our algorithm to standard SVM and transductive SVM, Experimental results show efficiency and effectiveness of our algorithm.
2005, 34(5): 672-675.
Abstract:
This paper proposes a new comprehensive valuation method based on characteristic of information system and the property that wavelet can smooth data and adapt to the change of function. Furthermore, the dilation and shifts that are the parameters of wavelet function and the weight of neural network structure are calculated by conjugated gradient algorithm in term of the latest mean squared energy criterion.The results shown by the simulation that the method was effective and veracity for comprehensive evaluation of information system, and can provide a new way for evaluation research of information system.
This paper proposes a new comprehensive valuation method based on characteristic of information system and the property that wavelet can smooth data and adapt to the change of function. Furthermore, the dilation and shifts that are the parameters of wavelet function and the weight of neural network structure are calculated by conjugated gradient algorithm in term of the latest mean squared energy criterion.The results shown by the simulation that the method was effective and veracity for comprehensive evaluation of information system, and can provide a new way for evaluation research of information system.
2005, 34(5): 676-679.
Abstract:
In this paper, an implementation of a virtual digital storage oscilloscope (DSO) based on PXI bus is presented. The principle of DSO data acquisition board and the DSO driver developing are introduced,and then, the soft panel designed in LabWindows/CVI platform is illustrated, finally, problems of data acquisition, data processing, waveform and measurement results display under various control commands and status are discussed.
In this paper, an implementation of a virtual digital storage oscilloscope (DSO) based on PXI bus is presented. The principle of DSO data acquisition board and the DSO driver developing are introduced,and then, the soft panel designed in LabWindows/CVI platform is illustrated, finally, problems of data acquisition, data processing, waveform and measurement results display under various control commands and status are discussed.
2005, 34(5): 680-683.
Abstract:
Some sufficient criterias about the existence and uniqueness of a ω-periodic solution are obtained under the assumption of that each output response is bounded and satisfies Lipschitz condition for Hopfield neural network, when all input signals are continuously ω-periodic functions and the network parameters satisfy suitable conditions, by means of the method of a suitable Lyapunov functional. And it is proved that all other solutions converge exponentially to the above ω-periodic solution. An intuitive explain of the above new criteras is given in the final example.
Some sufficient criterias about the existence and uniqueness of a ω-periodic solution are obtained under the assumption of that each output response is bounded and satisfies Lipschitz condition for Hopfield neural network, when all input signals are continuously ω-periodic functions and the network parameters satisfy suitable conditions, by means of the method of a suitable Lyapunov functional. And it is proved that all other solutions converge exponentially to the above ω-periodic solution. An intuitive explain of the above new criteras is given in the final example.
2005, 34(5): 684-687.
Abstract:
A new strueture of two orthogonal wedge interferometers is proposed by combining the properties of wedge multi-beams interferometers and two-ways detecting systems. All of the components are fixed, and the thickness difference of two interferometers is designed in a fixed value, which could make their fringe patterns have a fixed phase shift of p/2 when laser beams incoming. Two signals were subtracted through a differentiating amplifier. The background noise, which is superimposed on the fringe signals, could be removed and result in higher contrast ratio fringe signals. The proposed structure could be used in detecting weak laser signal in high background noise, and the wavelength of incident laser beams could be calculated simultaneity. The optical parameters were analyzed by computer simulation.
A new strueture of two orthogonal wedge interferometers is proposed by combining the properties of wedge multi-beams interferometers and two-ways detecting systems. All of the components are fixed, and the thickness difference of two interferometers is designed in a fixed value, which could make their fringe patterns have a fixed phase shift of p/2 when laser beams incoming. Two signals were subtracted through a differentiating amplifier. The background noise, which is superimposed on the fringe signals, could be removed and result in higher contrast ratio fringe signals. The proposed structure could be used in detecting weak laser signal in high background noise, and the wavelength of incident laser beams could be calculated simultaneity. The optical parameters were analyzed by computer simulation.
2005, 34(5): 688-691.
Abstract:
The design of an electrochemistry furnace for melting-salt electrochemistry tantalum anodic oxidation process and its temperature control system is introduced in this paper. The application of the parameter self-tuning fuzzy proportional-integral-derivative (PID) controller in this temperature control system is studied. In comparison with the conventional PID temperature control system, the simulation results indicate that the electrochemistry furnace with the parameter self-tuning PID controller has high control precision, good dynamic and static performances. The spot experiment result shows that the design has good practicability and validity.
The design of an electrochemistry furnace for melting-salt electrochemistry tantalum anodic oxidation process and its temperature control system is introduced in this paper. The application of the parameter self-tuning fuzzy proportional-integral-derivative (PID) controller in this temperature control system is studied. In comparison with the conventional PID temperature control system, the simulation results indicate that the electrochemistry furnace with the parameter self-tuning PID controller has high control precision, good dynamic and static performances. The spot experiment result shows that the design has good practicability and validity.
2005, 34(5): 692-695.
Abstract:
This paper proposes that array laser, wavelength division multiplexing (density wavelength division multiplexing) and multi-magnetization layers storage are combined to realize 3D information storage. The coupling object lens of optical fiber head can auto-focus the optical spot in near field, so that enormous information can be written and read simultaneously, and the tracking time of three-dimension information storage can be reduced greatly. At the same time, the optical signal amplitude received by photo-electricity detector is simulated by computer in detail. The search of parallel storage mode is important and basic to realize high density and enormous capacity storage.
This paper proposes that array laser, wavelength division multiplexing (density wavelength division multiplexing) and multi-magnetization layers storage are combined to realize 3D information storage. The coupling object lens of optical fiber head can auto-focus the optical spot in near field, so that enormous information can be written and read simultaneously, and the tracking time of three-dimension information storage can be reduced greatly. At the same time, the optical signal amplitude received by photo-electricity detector is simulated by computer in detail. The search of parallel storage mode is important and basic to realize high density and enormous capacity storage.
2005, 34(5): 696-699.
Abstract:
Particle swarm optimization, rooting from simulation of swarm of bird, solves optimization problem. Firstly, discusses particle swarm optimization algorithm principle and step of implementation, and then analyzes each of parameter. Particle swarm optimization algorithm compares with genetic algorithm through the same mathematic function. The comparative result indicates that Particle swarm optimization algorithm can obtain the optimum solutions more easily than genetic algorithm and it is a good optimization method with strong competition.
Particle swarm optimization, rooting from simulation of swarm of bird, solves optimization problem. Firstly, discusses particle swarm optimization algorithm principle and step of implementation, and then analyzes each of parameter. Particle swarm optimization algorithm compares with genetic algorithm through the same mathematic function. The comparative result indicates that Particle swarm optimization algorithm can obtain the optimum solutions more easily than genetic algorithm and it is a good optimization method with strong competition.
2005, 34(5): 700-702,716.
Abstract:
In this paper, the stability of stochastic cellular neural networks is studied. The cellular neural networks have become one of the hot study field internationally because of the important applications of the cellular neural networks theory. With the help of Liapunov theory, the method of matrix analysis, the mean square exponential stability of the stochastic cellular networks is studied. Then the second-order matrix Liapunov exponential estimation formula for the solution to the system is given. And the sufficient conditions of the mean square exponential stability for the solution are also given.
In this paper, the stability of stochastic cellular neural networks is studied. The cellular neural networks have become one of the hot study field internationally because of the important applications of the cellular neural networks theory. With the help of Liapunov theory, the method of matrix analysis, the mean square exponential stability of the stochastic cellular networks is studied. Then the second-order matrix Liapunov exponential estimation formula for the solution to the system is given. And the sufficient conditions of the mean square exponential stability for the solution are also given.
2005, 34(5): 703-705.
Abstract:
A class of fuzzy multi-valued implicit quasi-variational inclusions without the compactness condition and the corresponding fuzzy implicit resolvent operator equation in Banach space are introduced and studied. By using the resolvent operator technique, the equivalence between the fuzzy multi-valued implicit quasi-variational inclusions and the fuzzy resolvent operator equation in Banach space are established. A iterative algorithms、the existence theorem of solutions and iterative approximation for solving the fuzzy multi-valued implicit quasi-variational inclusions in Banach space are obtained.
A class of fuzzy multi-valued implicit quasi-variational inclusions without the compactness condition and the corresponding fuzzy implicit resolvent operator equation in Banach space are introduced and studied. By using the resolvent operator technique, the equivalence between the fuzzy multi-valued implicit quasi-variational inclusions and the fuzzy resolvent operator equation in Banach space are established. A iterative algorithms、the existence theorem of solutions and iterative approximation for solving the fuzzy multi-valued implicit quasi-variational inclusions in Banach space are obtained.
2005, 34(5): 706-708.
Abstract:
In this paper, an effective new way has been proposed to depict the bivariate life distribution based on conditional failure rate functions. And these conditional failure rate functions have been extended to generalize the depiction in n-dimensional life distribution.
In this paper, an effective new way has been proposed to depict the bivariate life distribution based on conditional failure rate functions. And these conditional failure rate functions have been extended to generalize the depiction in n-dimensional life distribution.
2005, 34(5): 709-712.
Abstract:
Based on the extended homogenous balance method, we get a Backlund transformation to the regularized long wave (RLW) equation. By applying our Backlund transformation and a given trivial solution, we find some explicit solutions of the RLW equation, such as solitary wave, periodic, rational and elliptic function solutions.
Based on the extended homogenous balance method, we get a Backlund transformation to the regularized long wave (RLW) equation. By applying our Backlund transformation and a given trivial solution, we find some explicit solutions of the RLW equation, such as solitary wave, periodic, rational and elliptic function solutions.
2005, 34(5): 713-716.
Abstract:
In this paper, some new properties of tridiagonally dominant and positive Inverse M-matrices are presented, respectively. Based on these properties, sufficient and necessary conditions of reducible inverse M-matrices and general inverse M-matrices are derived; Finally, a class of inverse M-matrices that is closed under the Hadamard multiplication is also obtained.
In this paper, some new properties of tridiagonally dominant and positive Inverse M-matrices are presented, respectively. Based on these properties, sufficient and necessary conditions of reducible inverse M-matrices and general inverse M-matrices are derived; Finally, a class of inverse M-matrices that is closed under the Hadamard multiplication is also obtained.
2005, 34(5): 717-719.
Abstract:
In this paper, we introduce and study a new class of infinite family of generalized set-valued quasi-variational inequality problems in Hilbert spaces. We construct an iterative algorithm and prove an existence of solutions for this kind of quasi-variational inequalities. We also prove the convergence of iterative sequences generated by the algorithm. The main results presented in this paper generalized some known results.
In this paper, we introduce and study a new class of infinite family of generalized set-valued quasi-variational inequality problems in Hilbert spaces. We construct an iterative algorithm and prove an existence of solutions for this kind of quasi-variational inequalities. We also prove the convergence of iterative sequences generated by the algorithm. The main results presented in this paper generalized some known results.
2005, 34(5): 720-723.
Abstract:
By combining the variation of price and volume we predict the following variation and get abnormal returns. Our empirical study show that, after controlling for the trading costs and risks, the efficiency of technical analysis transferring rule is relevant to the time span it adopts. Except that it result negatively as we apply a 0.2 trade volume, there is always a technical analysis transferring rule with a trade volume limiting can bring us more abnormal returns than without the limiting. In general, our study supports the conclusion that the technical analysis rule with the conformation of volume and price has some efficiency, though further study is always expected.
By combining the variation of price and volume we predict the following variation and get abnormal returns. Our empirical study show that, after controlling for the trading costs and risks, the efficiency of technical analysis transferring rule is relevant to the time span it adopts. Except that it result negatively as we apply a 0.2 trade volume, there is always a technical analysis transferring rule with a trade volume limiting can bring us more abnormal returns than without the limiting. In general, our study supports the conclusion that the technical analysis rule with the conformation of volume and price has some efficiency, though further study is always expected.
2005, 34(5): 724-727.
Abstract:
This paper discussed how the powers of retailers influence the channel prices and the choice of retailers with different market structure under competition environment. Thereinto,the powerful retailer is active on decision the wholesale and retail price. On the other hand, the only choice of the weak retailer is undertaking the wholesale price,therefore his tactic is introducing a flexible product combination and pricing structure.And we pay more attention to the weak retailer's sales strategy.
This paper discussed how the powers of retailers influence the channel prices and the choice of retailers with different market structure under competition environment. Thereinto,the powerful retailer is active on decision the wholesale and retail price. On the other hand, the only choice of the weak retailer is undertaking the wholesale price,therefore his tactic is introducing a flexible product combination and pricing structure.And we pay more attention to the weak retailer's sales strategy.
