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2003 Vol. 29, No. 9

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Preferred growth of nanosized crystal silicon in doped hydrogenated nanocrystalline silicon film
Wei Wensheng, Wang Tianmin, Zhang Chunxi, Li Guohua
2003, 29(9): 753-758.
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Abstract:
The preferred growth of nanosized crystal silicon (nc-Si) in doped hydrogenated nanocrystalline silicon (nc-Si:H) films which were prepared using plasma enhanced chemical vapor deposition (PECVD) system by RF(13.56 MHz) and DC bias stimulating was found. Its microstructure was investigated using X-r...
Investigation on methods of kerosene/oxygen ignition using gas dynamic resonance technique
Yu Nanjia, Zhang Guozhou, Ma Bin
2003, 29(9): 759-762.
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In order to realize the multiple ignitions of liquid rocket engines reliably, gas dynamic resonance ignition was applied to ignite kerosene/oxygen. Two ignition methods of kerosene/oxygen igniter, direct ignition and indirect ignition, were discussed. For direct ignition method, the differences betw...
Research for the kinematic and dynamic models of a flexible glass-wall cleaning robot
Wang Wei, Zong Guanghua
2003, 29(9): 763-766.
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A new structure for a smart wall-climbing robot was propossed.The conceptions of Lie Group and differential geometry were used in the robot's controllability analysis. The kinematic and dynamic models of the robot were concluded.The expressions of Lagrange multipliers were acquired to represent the ...
High performance single reflector compact range
Quan Shaohui, He Guoyu, Xu Yongbin, Jiang Xianzuo
2003, 29(9): 767-769.
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Abstract:
A single reflector compact range (CR) was presented. The reflector itself was made up of individual accurately fabricated panels. The precise forming of each panel was based on "nails die, vacuum and honeycomb sandwich" method. Average surface accuracy of these panels was 25 micron rms and surface a...
Analysis and application of unsymmetric composite structure
Zhang Xiaodong, Zhang Jikui, Li Zhengneng, Xu Dewei
2003, 29(9): 770-773.
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Unsymmetric composite structure is a kind of orthotropic material, and has more designabilities than symmetric composite structure. Those abilities can be used to solve such wing's problems in design as twist diversion, redistribution of load and low efficiency of control. Based upon the results of ...
Research on modular combined modeling for parallel mechanism
Zhu Yu, Meng Biao, Zhang Hua, Zhang Yongzhong
2003, 29(9): 774-778.
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Based on the combined modeling and a method of describing in character strings of parallel mechanisms, the principium and algorithm of automatically combined modeling of parallel mechanisms were discussed. The modules of automatically combined modeling of parallel mechanisms in PKM-VPDS made the dig...
Consideration in the structure design of brushless DC motor for flight control
Wang Ziqiang, Zhu Yaozhong, Chen Jiefeng
2003, 29(9): 779-782.
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Development of the electromechanical actuation system for use in primary flight control is one of the most technologies in the path to an all-electric airplane. Brushless DC motor is the key in the system. For obtained the high electrical reliability, high mechanical reliability and thermal reliabil...
A kind of approach based on signal model for resource configuration in ATE
Zhang Wei, Shen Shituan, Li Yihua
2003, 29(9): 783-788.
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Aiming to alleviate the limited test resource situation and provide an automatic configuration process, a signal modeling method based on object-oriented analysis was proposed with a general description language, and according to this consideration, an implementation approach that can acquire resour...
Analog circuits fault diagnosis based on serial support vector multi-classifier
Wan Jiuqing, Li Xingshan
2003, 29(9): 789-792.
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A new support vector multiclassification methodology was proposed where several binary support vector binary classifiers, each of which equipped with a feature extractor based on kernel principle components analysis (Kernel PCA), were organized in a serial structure. Its training and classification ...
Research and implementation on the intelligent driving behavior model of autonomous virtual human
Qin Shuang, Liu Jinghua, Wen Wenbiao, Zheng Guolei
2003, 29(9): 793-796.
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Abstract:
Combining artificial intelligence with virtual reality to create autonomous virtual character is an important aspect of virtual reality research. The intelligent driving behavior of the autonomous virtual human in the virtual traffic environment were concentrated. A hierarchical driver behavior and ...
Numerical optimization in a structured/unstructured grid
Tuo Shuangfen, Zhu Ziqiang, Chen Yingchun
2003, 29(9): 797-801.
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Abstract:
Much attention had been shifted to the unstructured grid methods. It was due to the relative ease with which these methods could be applied to solve flow problems around complex geometries and the ease with which local refinement of an unstructured grid could be carried out. Numerical optimization a...
Research on feature extraction of impulse signal using Walsh transform
Li Baoan, Li Xingshan, Liu Xing
2003, 29(9): 802-806.
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Abstract:
Compared with Fourier transform, the amplitude of the impulse signal power spectrum of Walsh transform was larger than that of Fourier transform, and the calculation speed of Walsh transform was faster. Wavelet packet analysis could reduce noise of the signal and filter unnecessary signals and chara...
Study on the fatigue properties of the TA15 titanium alloy plate and electron beam welding specimen
Wang Xiangming, Liu Wenting, He Xiaofan
2003, 29(9): 807-811.
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Abstract:
Based on the analysis and processing of the fatigue test results of the standard specimens of the TA15 Titanium alloy thin plate and the fatigue test results of the plate at two stress levels, the S-N curve of TA15 plate was established. The fatigue tests at two stress levels were carried out for TA...
Subdivided locating method of star image for star sensor
Wei Xinguo, Zhang Guangjun, Jiang Jie
2003, 29(9): 812-815.
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Abstract:
The basic principle of star sensor and major pre-processing methods of star image were introduced. The traditional centroid, threshold centroid, squared centroid and Gauss curve fitting methods were applied into star locating of star image for star sensor. The simulation was carried out sufficiently...
Experimental investigation of high temperature fatigue properties of GH2132
Niu Huipeng, Zhang Zheng, Liu Shaolun
2003, 29(9): 816-820.
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Abstract:
High cycle fatigue and low cycle fatigue properties and fracture behavior of GH2132 were investigated under different temperature, stress intensity factor and stress. The effect of each parameter was analyzed to determine the interaction on fatigue life. It was found that the parameter, which affect...
Research on the modeling and algorithm of multi-objective crew rostering
Li Qing, Zhang Jun, Zhang Xuejun
2003, 29(9): 821-824.
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Abstract:
To improve the solution of the rostering problem, a multi-objective optimization model was proposed. The adaptive genetic algorithm based on entropy was improved and was used to solve the rostering problem to attain the best solution. In the improved method, inferior individuals were adopted with so...
Real-time algorithm for the detection and classification of the exceptions in the home security surveillance
Zhou Bing, Du Runqiu, Li Bo
2003, 29(9): 825-828.
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Abstract:
Fast and robust detection of moving objects was difficult for a security surveillance system based PC. By combing the illumination and the chroma in the YUV color space, the problem was solved that a big breaking-in object causes the background pixels to change its illumination. A fast method for an...
Development platform for embedded graphics user interface
Xing Weiwei, Fan Shangchun
2003, 29(9): 829-833.
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Abstract:
According to the requirements and characteristics of products as intelligent instruments based on MCU, DEG, a development platform for low-side embedded GUI systems, had been developed. DEG was a collection of development tools and graphics library. The graphics library, which was organized as an ob...
Implementation of elliptic curve digital signature arithmetic based on smart card
Zhang Jinghe, Zhang Qishan, Wu Jinpei
2003, 29(9): 834-837.
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Abstract:
Elliptic curve digital signature arithmetic can achieve high security using a shorten key, so it is very suitable to realize this arithmetic on smart card. The characteristic of hardware accelerator was introduced. In order to increase the executive speed of elliptic curve digital signature arithime...
Multiuser detection based on hidden Markov models
Liu Feng, Zhang Taiyi, Hu Jinyan
2003, 29(9): 838-842.
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Abstract:
For investigation on the slow convergence speed of channel estimation and the unreason of state estimation in the probabilistic algorithms, a new multiuser detection was presented. Based on the hidden Markov models, it adopted the fixed-lag to avoid divergence in the estimation channel, and used the...
Research on the method of simulating road roughness numerically
Liu Xi, ong, Deng Zhidang
2003, 29(9): 843-846.
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To obtain exact road roughness, a new method processing directly the given power spectral density was introduced. Considering the effect of the vehicle natural vibration frequency and velocity completely, the simulation and analysis were done on the C grade of road using this method. The results ind...

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