ISSN 
2000 Vol. 29, No. 2
2000, 29(2): 111-114.
Abstract:
This paper gives a field experimental system consisting of an uniform four-element linear array and a meter band radar, which is designed for azimuth super-resolution test of meter band radar The sampled experimental data are processed with different algorithms. It is indicated that two airplanes being 0.2-0.3 beam width apart in azimuth can be resolved clearly by FBLP algorithm and ESPRIT algorithm.
This paper gives a field experimental system consisting of an uniform four-element linear array and a meter band radar, which is designed for azimuth super-resolution test of meter band radar The sampled experimental data are processed with different algorithms. It is indicated that two airplanes being 0.2-0.3 beam width apart in azimuth can be resolved clearly by FBLP algorithm and ESPRIT algorithm.
2000, 29(2): 115-117.
Abstract:
In this paper, the UWB radar equation is deduced. The distinctions between the classical and the UWB radar equation are studied. Simulation results indicate that the UWB radar performs better than the classical radar given that the signal-to-noise at the receiver input is equivalent.
In this paper, the UWB radar equation is deduced. The distinctions between the classical and the UWB radar equation are studied. Simulation results indicate that the UWB radar performs better than the classical radar given that the signal-to-noise at the receiver input is equivalent.
2000, 29(2): 118-121.
Abstract:
This paper presents a modularized, internal local bused, real-time MPEG2 system layer de-multiplex in DVD. The circuit general architecture, start code detection circuit, PES header decoding circuit and PLL circuit are discussed in detail. The FPGA implementation results of this real-time de-multiplex are introduced. It is a simple, resource saved, easy to be integrated system with functions of multi-PES distribution, system clock recovery and etc. It is proper for the applications in DVD and some other relative fields.
This paper presents a modularized, internal local bused, real-time MPEG2 system layer de-multiplex in DVD. The circuit general architecture, start code detection circuit, PES header decoding circuit and PLL circuit are discussed in detail. The FPGA implementation results of this real-time de-multiplex are introduced. It is a simple, resource saved, easy to be integrated system with functions of multi-PES distribution, system clock recovery and etc. It is proper for the applications in DVD and some other relative fields.
2000, 29(2): 122-125.
Abstract:
On the basis of the reciprocal characteristic of SAR image and optical image, a wavelet transformation is used to implement fusion of SAR image and optical image.The method of image fusion presented in this paper can get the high frequency information of wavelet transformation of SAR image and detail information of wavelet transformation of optical image, thus composes a new resolving coefficient.
On the basis of the reciprocal characteristic of SAR image and optical image, a wavelet transformation is used to implement fusion of SAR image and optical image.The method of image fusion presented in this paper can get the high frequency information of wavelet transformation of SAR image and detail information of wavelet transformation of optical image, thus composes a new resolving coefficient.
2000, 29(2): 126-130.
Abstract:
In this paper, the technique of detecting leukemia and monitoring its treatment by microwave is presented. Two types of microwave source with operating frequency 800 MHz, i.e., line source and shorter antenna are considered. The finite-difference time-domain(FDTD) method is used to investigate the scattering field as the functions of the pathological degree of leukemia. The analysis shows that the better distinguishability and detective sensitivity can be obtained when shorter antenna is employed as microwave source.
In this paper, the technique of detecting leukemia and monitoring its treatment by microwave is presented. Two types of microwave source with operating frequency 800 MHz, i.e., line source and shorter antenna are considered. The finite-difference time-domain(FDTD) method is used to investigate the scattering field as the functions of the pathological degree of leukemia. The analysis shows that the better distinguishability and detective sensitivity can be obtained when shorter antenna is employed as microwave source.
2000, 29(2): 131-135.
Abstract:
In this paper, new filters based on noise detection are proposed for impulse noise removal in color images. In the new method, impulse noise is properly detected, and the detected noisy pixels are filtered with adaptive selection of filter window, while the noise-free pixels are kept without any changes. Experimental results show that the proposed filters remove impulse noise and preserve edges and details very well, which perform better than the classical vector median filter (VMF), direction-distance filter (DDF), and directional-magnitude vector filter (DMVF).
In this paper, new filters based on noise detection are proposed for impulse noise removal in color images. In the new method, impulse noise is properly detected, and the detected noisy pixels are filtered with adaptive selection of filter window, while the noise-free pixels are kept without any changes. Experimental results show that the proposed filters remove impulse noise and preserve edges and details very well, which perform better than the classical vector median filter (VMF), direction-distance filter (DDF), and directional-magnitude vector filter (DMVF).
2000, 29(2): 136-139.
Abstract:
In this paper, asymmetrical coplanar lines in free space are analyzed using two conformal mapping models, and the exact solutions for the basic parameters of the lines are obtained. The asymmetrical coplanar lines with multi-layered substrate are analyzed using the hyper tangential transformation. Analytic closed form expressions for the effective dielectric constant and the characteristic impedance are introduced.
In this paper, asymmetrical coplanar lines in free space are analyzed using two conformal mapping models, and the exact solutions for the basic parameters of the lines are obtained. The asymmetrical coplanar lines with multi-layered substrate are analyzed using the hyper tangential transformation. Analytic closed form expressions for the effective dielectric constant and the characteristic impedance are introduced.
2000, 29(2): 140-143.
Abstract:
An unidirectional dielectric radiator for antenna is simulated with FDTD method on PC. The radiation pattern is calculated, and numerical results agree with experimental results. The simulation results indicate that this type of model with broad beam-width and good gain gives off radiation only in forward direction, so it can be used in mobile communication handset, anti-collision radar and space power combining circuits.
An unidirectional dielectric radiator for antenna is simulated with FDTD method on PC. The radiation pattern is calculated, and numerical results agree with experimental results. The simulation results indicate that this type of model with broad beam-width and good gain gives off radiation only in forward direction, so it can be used in mobile communication handset, anti-collision radar and space power combining circuits.
2000, 29(2): 144-148.
Abstract:
in this paper, a new algorithm is presented to decrease the cross-terms in the Wigner distribution resulted from the bilinear character The separation between auto-term and cross-term is performed by using Hough transform, forming a dynamic kernel varying as signal changes. By using such a kernel, energy of the detected signal can be retained at quite a high level, thus the final time-frequency distribution can reflect the energy distribution of original signals, which is irregular in traditional Choi-Williams distribution or its improved form. Experimental results prove the effectiveness of new algorithm.
in this paper, a new algorithm is presented to decrease the cross-terms in the Wigner distribution resulted from the bilinear character The separation between auto-term and cross-term is performed by using Hough transform, forming a dynamic kernel varying as signal changes. By using such a kernel, energy of the detected signal can be retained at quite a high level, thus the final time-frequency distribution can reflect the energy distribution of original signals, which is irregular in traditional Choi-Williams distribution or its improved form. Experimental results prove the effectiveness of new algorithm.
2000, 29(2): 149-152.
Abstract:
The problem of measurements for microwave devices is considered, and a physical model for LRL (Line-Reflect-Line) calibration method is described. The closed form expressions for devices under test are derived by means of microwave network theory and matrix techniques.The errors caused by the phase uncertainties of embedded parameters are deleted. In addition, LRL method can be used to de-embed the S parameters from the microwave transistor test fixture.
The problem of measurements for microwave devices is considered, and a physical model for LRL (Line-Reflect-Line) calibration method is described. The closed form expressions for devices under test are derived by means of microwave network theory and matrix techniques.The errors caused by the phase uncertainties of embedded parameters are deleted. In addition, LRL method can be used to de-embed the S parameters from the microwave transistor test fixture.
2000, 29(2): 153-157.
Abstract:
He ion implantation localized lifetime control SOI lateral insulated gate bipolar transistor (SOI-LIGBT) is proposed in this paper,which can effectively raise the turn-off speed of devices,which is compatibles with integrated circuit process.It is demonstrated by numerical simulation that the tf~VF trade-off is superior to the devices using unlocalized lifetime control,the forward on-state voltage can be reduced by 0.6-1.4 V at the same turn-off speed,and it can avoid the snap-back phenomena of anode-short structure.
He ion implantation localized lifetime control SOI lateral insulated gate bipolar transistor (SOI-LIGBT) is proposed in this paper,which can effectively raise the turn-off speed of devices,which is compatibles with integrated circuit process.It is demonstrated by numerical simulation that the tf~VF trade-off is superior to the devices using unlocalized lifetime control,the forward on-state voltage can be reduced by 0.6-1.4 V at the same turn-off speed,and it can avoid the snap-back phenomena of anode-short structure.
2000, 29(2): 158-160.
Abstract:
By wet-precipitation method, pure calcium phosphate powder with Ca/P P molar ratio of 1.67 and good Crystallization is synthesized in lab. A new type of four-hole sutured artificial eyeball is made by foaming through traditional ceramic technology. The eyeball holds a uniform and inter-connective micropores with an average diameter of 300 μm and a porosity of 75%. The new type of eyeball is used in the repair and plastics of patients' ophthalmosteresis, and there is no need to use the foreign sclera.
By wet-precipitation method, pure calcium phosphate powder with Ca/P P molar ratio of 1.67 and good Crystallization is synthesized in lab. A new type of four-hole sutured artificial eyeball is made by foaming through traditional ceramic technology. The eyeball holds a uniform and inter-connective micropores with an average diameter of 300 μm and a porosity of 75%. The new type of eyeball is used in the repair and plastics of patients' ophthalmosteresis, and there is no need to use the foreign sclera.
2000, 29(2): 161-163.
Abstract:
This paper introduces the basic theory and realization of genetic algorithm, and discussed their application in the optimization of the fuzzy-control rules. Air conditioning temperature fuzzy-controller is also introduced as an example. The genetic coding, crossover operation and mutation operation are studied in detail. This optimizing algorithm provides a regular method for the design of the fuzzy-controller.
This paper introduces the basic theory and realization of genetic algorithm, and discussed their application in the optimization of the fuzzy-control rules. Air conditioning temperature fuzzy-controller is also introduced as an example. The genetic coding, crossover operation and mutation operation are studied in detail. This optimizing algorithm provides a regular method for the design of the fuzzy-controller.
2000, 29(2): 164-166.
Abstract:
This paper gives a sample of computer testing system in which component technology is applied. This technology is used to improve the reusability of software in encapsulating hardware system.
This paper gives a sample of computer testing system in which component technology is applied. This technology is used to improve the reusability of software in encapsulating hardware system.
2000, 29(2): 167-169.
Abstract:
In this paper, a laser automatic positioning alignment system is presented which position the electron gun relating to the screen. This system consists of laser, laser collimating, a sensor, a controlling system of single chip microcomputer, driving circuit and special reducer. Under the control of single chip microcomputer, it completes the locating of electron gun automatically. The simulated experiment shows that this system completely position the electron-gun in the rang of positioning precision.
In this paper, a laser automatic positioning alignment system is presented which position the electron gun relating to the screen. This system consists of laser, laser collimating, a sensor, a controlling system of single chip microcomputer, driving circuit and special reducer. Under the control of single chip microcomputer, it completes the locating of electron gun automatically. The simulated experiment shows that this system completely position the electron-gun in the rang of positioning precision.
2000, 29(2): 170-173.
Abstract:
In order to optimize parameters of fuzzy identifier, this paper proposes a scheme, which deals with the off-line analysis of fuzzy identifier by MGA. BP-algorithm is employed to implement the fuzzy identification of nonlinear dynamic system.When input is one language variable, this scheme is proved to be realizable. The simulation results are also given in this paper.
In order to optimize parameters of fuzzy identifier, this paper proposes a scheme, which deals with the off-line analysis of fuzzy identifier by MGA. BP-algorithm is employed to implement the fuzzy identification of nonlinear dynamic system.When input is one language variable, this scheme is proved to be realizable. The simulation results are also given in this paper.
2000, 29(2): 174-177.
Abstract:
In this paper, the substrate noise coupling in the mixed-signal ICs and its effect on the analog/digital circuits are investigated. The heavily doped substrate with an epitaxial layer is adopted. Two benchmark circuits are evaluated. Proper simulation technique for the mixed-signal circuits in SPICE for high speed and high frequency operations is developed.
In this paper, the substrate noise coupling in the mixed-signal ICs and its effect on the analog/digital circuits are investigated. The heavily doped substrate with an epitaxial layer is adopted. Two benchmark circuits are evaluated. Proper simulation technique for the mixed-signal circuits in SPICE for high speed and high frequency operations is developed.
2000, 29(2): 178-181.
Abstract:
This paper introduces Petri net model of functional test pattern generation for VLSI. Relationships between operators involved in test sequence are accomplished via Petri. Reduced matrix compacting storage of net topology is constructed. Ambiguity of test sequence is checked via Petri net matrix. Test pattern is optimized and the best test sequence is got.
This paper introduces Petri net model of functional test pattern generation for VLSI. Relationships between operators involved in test sequence are accomplished via Petri. Reduced matrix compacting storage of net topology is constructed. Ambiguity of test sequence is checked via Petri net matrix. Test pattern is optimized and the best test sequence is got.
2000, 29(2): 182-185.
Abstract:
This paper presents a method of calculating the reliable service life of magneto-optic disks by way of analyzing figures of weibull parameters,which overcome the analysis of only one or definite construction of MO disks before. In this method, MO disk is considered as a whole system and the invalid of BER is taken into account. The reliable service life of MO disks is calculated at normal atmosphere by means of analyzing the experiments result which is concluded by acceleration experiments of high temperature.
This paper presents a method of calculating the reliable service life of magneto-optic disks by way of analyzing figures of weibull parameters,which overcome the analysis of only one or definite construction of MO disks before. In this method, MO disk is considered as a whole system and the invalid of BER is taken into account. The reliable service life of MO disks is calculated at normal atmosphere by means of analyzing the experiments result which is concluded by acceleration experiments of high temperature.
2000, 29(2): 186-189.
Abstract:
The essence of design in control system is a problem of solving contradictory performance criteria (CPC).In this paper, a new design principle, satisfactory optimal principle (SOP),is proposed in accordance with CPC. The weights of all-around performance criteria satisfactory function are obtained by analyzing approximative extent base on speed feature of CPC. An example of finding optimal damped ratio in second order underdamped control system is given.
The essence of design in control system is a problem of solving contradictory performance criteria (CPC).In this paper, a new design principle, satisfactory optimal principle (SOP),is proposed in accordance with CPC. The weights of all-around performance criteria satisfactory function are obtained by analyzing approximative extent base on speed feature of CPC. An example of finding optimal damped ratio in second order underdamped control system is given.
2000, 29(2): 190-192.
Abstract:
This paper gives a new expression of steady-error series, which overcome the fault of the traditional steady-error series.Three concludes are present, which can be used to analyze the rule of steady-error with time change.
This paper gives a new expression of steady-error series, which overcome the fault of the traditional steady-error series.Three concludes are present, which can be used to analyze the rule of steady-error with time change.
2000, 29(2): 193-196.
Abstract:
The importance of deploying CORBA technology in distributed real-time applications is studied. Typical real-time and fault tolerance requirements are carefully considered before developing realtime extensions to CORBA. Techniques to fulfill realtime CORBA objects and realtime objects bus are discussed and a real-time fault-tolerant CORBA frame model is proposed.
The importance of deploying CORBA technology in distributed real-time applications is studied. Typical real-time and fault tolerance requirements are carefully considered before developing realtime extensions to CORBA. Techniques to fulfill realtime CORBA objects and realtime objects bus are discussed and a real-time fault-tolerant CORBA frame model is proposed.
2000, 29(2): 197-200.
Abstract:
The topology of an artificial neural network (ANN), characterized by connectionism, is an important factor which affects the function and the performance of ANN. In this paper, based on analysis of some existing neural network models, a method for constructing BP networks using serial-parallel computing is proposed. "Ordering", one of the three sample feature problems, is solved topologically. Analysis shows that precision and learning speed of ANN are enhance remarkably.
The topology of an artificial neural network (ANN), characterized by connectionism, is an important factor which affects the function and the performance of ANN. In this paper, based on analysis of some existing neural network models, a method for constructing BP networks using serial-parallel computing is proposed. "Ordering", one of the three sample feature problems, is solved topologically. Analysis shows that precision and learning speed of ANN are enhance remarkably.
2000, 29(2): 201-204.
Abstract:
This paper studies the primary security technology with Lotus Domino, and analyzes the network security in office automation system. The principle and mechanism of user authentication in local area network and wide area network are investigated. A practical user authentication protocol and its authentication process are given.
This paper studies the primary security technology with Lotus Domino, and analyzes the network security in office automation system. The principle and mechanism of user authentication in local area network and wide area network are investigated. A practical user authentication protocol and its authentication process are given.
2000, 29(2): 205-208.
Abstract:
This paper discusses real-time scheduling. Classic real-time scheduling algorithms in uni-processor systems and two typical multi-processor scheduling algorithms are investigated. Distributed real-time scheduling algorithms are analyzed briefly.
This paper discusses real-time scheduling. Classic real-time scheduling algorithms in uni-processor systems and two typical multi-processor scheduling algorithms are investigated. Distributed real-time scheduling algorithms are analyzed briefly.
2000, 29(2): 209-213.
Abstract:
The structures of circular graphs of degree 4 are discussed. All non-isomorphic connected circular graphs with order n and degree 4 are divided into two types:type Ⅰ and type Ⅱ. A formula calculating the number of type Ⅰ is given. The formula about enumeration of circular graphs of non-isomorphic with order n and degree 4 is improved.
The structures of circular graphs of degree 4 are discussed. All non-isomorphic connected circular graphs with order n and degree 4 are divided into two types:type Ⅰ and type Ⅱ. A formula calculating the number of type Ⅰ is given. The formula about enumeration of circular graphs of non-isomorphic with order n and degree 4 is improved.
2000, 29(2): 214-217.
Abstract:
A certain boundary optimization algorithm-inequality method is presented in this paper. Based on the developed program with language C++, the algorithm is applied to the optimization design of the optical system, and several typical optical systems are designed. The design process and result demonstrate the advantages of quick convenience speed and stability of this algorithm, which conform with the traditional optical system design.
A certain boundary optimization algorithm-inequality method is presented in this paper. Based on the developed program with language C++, the algorithm is applied to the optimization design of the optical system, and several typical optical systems are designed. The design process and result demonstrate the advantages of quick convenience speed and stability of this algorithm, which conform with the traditional optical system design.
2000, 29(2): 218-220.
Abstract:
The luminous materials of SrO-TiO2-SiO2-SiO2:Eu3+,Bi3+ are synthesized by Sol-gel method.The condition of synthesis is studied.It is found that the compound with the formula 2SrO-4(TiO2,SiO2):0.12Eu3+,0.005Bi3+ gives.the strongest fluorescence.The excitation spectra,emission spectra and X-ray power diffraction pattern of the phosphor are also given.
The luminous materials of SrO-TiO2-SiO2-SiO2:Eu3+,Bi3+ are synthesized by Sol-gel method.The condition of synthesis is studied.It is found that the compound with the formula 2SrO-4(TiO2,SiO2):0.12Eu3+,0.005Bi3+ gives.the strongest fluorescence.The excitation spectra,emission spectra and X-ray power diffraction pattern of the phosphor are also given.
