中国科学院机构知识库网格系统: 检索

Simulation test system of CCD signal processor based on FPGA (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan
作者: Zhang D.; Liu D.-B.; Zhang D.

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Simulation test system of CCD signal processor based on FPGA is proposed. Field-programmable gate array (FPGA) is applied as control processing core and used in the aerospace upgrade screening of industrial grade signal processor. The system functional composition and working principle were introduced in detail. Actually evaluation and testing system was completed with integrating the forty signal processor in a single board. The system has been successfully applied in the dynamic build-in screening test of industrial grade signal processor XRD98L63 the system work stably and reliability. Test result is zero on the nonconforming product rate satisfying the qualification that single batch screening nonconforming rate is less than 5% build-in screening of industrial grade components for the space load applications is implemented. (2013) Trans Tech Publications Switzerland.

Reentry guidance based on feedback linearization (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronics, Communications and Control, ICECC 2011, September 9, 2011 - September 11, 2011, Ningbo, China
Li D.-W.

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This paper presents a new reentry guidance algorithm for RLV (Reusable Launching Vehicle). The algorithm consists of two integrated components: trajectory planning algorithm and tracking algorithm. The most striking feature of algorithm here lies in that both planning and tracking are executed directly in height-velocity space which is different from the methodology of configuration of drag in traditional shuttle guidance. In the session of trajectory planning all trajectory constraints can be expressed with upper bound and lower bound in height-velocity space then a linear interpolation is carried to search the nominal trajectory satisfying the requirement of downrange and target constraints. Then the tracking algorithm uses feedback linearization method to track this nominal profile and meet all constraints. Another typical feature of this algorithm is the strategy of downrange extension using FPA (flight path angle) controller to fulfill the requirement of large downrange. Proper combination of planning-tracking algorithm and FPA controller can bring great flexibility and adaptability to reentry guidance. The algorithm is proved to be robust enough to accommodate the model error and noises in the dynamics. 2011 IEEE.

The Research of real time auto-recognition of the moire fringe (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wang M.-J.; Wu Z.-G.

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Measuring the movement of raster by the method of moire fringe has the advantage of high sensitivity high resolution and non-contacted measurement. The characteristic of moire fringe is that the image is white alternate with black the angle of the stripes is uniform the width of the stripes is uniform the terminators of the stripes aren't clear. A fast method that can figure out the width and angle of the moire fringe precisely is put forward in this paper. It calculates the angle the stripes firstly. According to the principle of the minimum mean squared error (MMSE) the closer a series of data is the smaller the value of the MMSE will be. The method is described as follows: It takes the image's center as the origin 180 beelines pass through the origin with the same angle interval. it calculates the value of the minimum mean squared error of the 180 beelines and find out the least one among those then the angle of the moire fringe comes out primarily. In order to improving the calculating precision of moire fringe 60 equal angles are divided in the neighborhood of the angle then a precise angle of moire fringe is calculated according to the principle of the MMSE. After getting out the angle of the moire fringe we begin to calculate the width of moire fringe. A line vertical with the moire fringe is drawn and we can get the width of the moire fringe by the vertical line. In order to get over the influence of the noise an effective area with the shape of diamond is selected in the image. The data of area is accumulated and projected according to the direction of moire fringe and a sine curve come out. The width of moire fringe can be obtained by getting the position of the first wave crest the position of the last wave crest and the number of wave crest. Experiments prove that the precision of the method put forward in this paper is enhanced in comparison with the traditional frequency method the precision of width calculation achieves to 99.6% according to the evaluation indicators of width detection error. The computing speed is boosted largely compared with traditional method and it can achieve with 15 ms that satisfying the demand of real time. 2011 SPIE.

文献传递统计分析及其启示——以中国科学院新疆分院文献信息中心为例/Document Delivery Statistical Analysis and Insight——The CAS Xinjiang Branch of Documentation and Information Center as Example[J] 期刊论文 OAI收割
科技广场, 2011, 卷号: 6, 页码: 173-177
作者: 杨晓; 李宏建; 陈洁; 中国科学院新疆生态与地理研究所,新疆乌鲁木齐,830011

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收藏 | 浏览/下载：16/0 | 提交时间：2017/12/29

文献传递文献满足率文献资源建设图书馆 Literature Delivery Satisfying Rate Of Literature Literature Resource Development Library

Domain-driven classification based on multiple criteria and multiple constraint-level programming for intelligent credit scoring 期刊论文 iSwitch采集
Ieee transactions on knowledge and data engineering, 2010, 卷号: 22, 期号: 6, 页码: 826-838
作者: He, Jing; Zhang, Yanchun; Shi, Yong; Huang, Guangyan

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Credit scoring Domain-driven classification Mathematical programming Multiple criteria and multiple constraint-level programming Fuzzy programming Satisfying solution

Optimal design of strap-down inertial navigation support under random loads (EI CONFERENCE) 会议论文 OAI收割
2010 IEEE International Conference on Information and Automation, ICIA 2010, June 20, 2010 - June 23, 2010, Harbin, Heilongjiang, China
作者: Li M.

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In order to realize miniaturization and light weight of the strap-down inertial navigation system and then to make sure that it works well under random loads optimal design is applied to the strap-down inertial navigation support with the methods of topology optimization and size optimization. Firstly based on the installation requirement of devices and connection requirement of the support and the carrier the initial structure of the support is designed. Topology optimization with FEA software ANSYS is adopted on the initial structure to get the basic one. Then 5 critical sizes are chosen as design variables and the support structure is optimized by means of size optimization to reach light weight with satisfying the requirement of dynamic stiffness. Finally random vibration analysis is applied to the initial structure. In the mean time random vibration test is carried out to qualify the analysis method. After the qualification a random vibration analysis is applied to the optimized support structure to get the rms of displacement response and acceleration response of the support to validate whether the optimized structure is appropriate. The results indicate that the dynamic stiffness of the optimized support structure satisfies the design requirements and its weight is lighter 49.38% than that of the initial one. This research can be a reference to the structure design of supports under random loads and the result has been applied to the development and manufacture of a prototype aerocraft. 2010 IEEE.

Software radio research of spread spectrum communication system (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer Application and System Modeling, ICCASM 2010, October 22, 2010 - October 24, 2010, Shanxi, Taiyuan, China
Tan Z.-J.; Shi Y.; Zhong Z.-J.

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Developing status of software radio is introduced. The configuration of software radio in direct sequence spread spectrum communication system is realized which are composed of the configurations of both transmitter and receiver. The capture and stealth problems of extended coding phase are researched. At last the working status of BPSK and QPSK modulated system is emulated using DSP emulator CCS2.0 and the result is satisfying. 2010 IEEE.

Application of master-slave multi-communication system in pilotless airborne mapping equipment (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Instrumentation Science and Technology, September 15, 2009 - September 18, 2009, Shenyang, China
作者: Chen J.; Wang W.; Wang W.; Zhang Y.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

This paper presents a master-slave multi-communication system designed with several micro-controllers used as master and slave controllers to set signal the lamp to realize point-to-point communication through the RS422 interface. By describing a typical example of this system and the blue print of hardware and the flowchart of software the reliable work of the system has been proved. The circuits of system are very simple and practical and they can be used to realize all the functions of a pilotless airborne mapping equipment. It also has a strong anti-jamming capability due to its balanced transfer scheme with single transmitter and multiple receivers. It is very efficient in protecting the integrity and correctness of transmitted and received signals avoiding the collision of signals through the bus satisfying the communication among several micro-controllers in a single system and forming a special communication network. 2009 SPIE.

Research of automatic test technology of parameters used in a dual-CCD TV measure-system (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 2, 2005 - November 5, 2005, Zian, China
作者: Wang L.; Li Y.; Li Y.; Li Y.; Li Y.

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This paper describes a kind of automatic test technology of the parameters used in a dual-CCD TV measure-system (TV -MS) .The TV -MS is the ground control equipment of the anti-tank missile and integrates the technologies of optical machine and electronics. It is important and key component. The main technical parameters of the TV -MS are field of view zero point precision sensitivity anti-jamming ability zooming time and focus time etc. To insure the TV -MS satisfying the tactical and technical requirements and discover fault and reason a fast and accurate equipment satisfying the test technical parameters of the TV -MS is urgently needed in manufacture and service. Firstly the parameter test system converted optical signal to electronic signal implemented automatic control of the invariant illumination of parallel pipeline output. Secondly data and command delivering displaying or printing are realized by using 80C196KB. The experiment result shows that the approach of automatic testing of the Parameters used in a dual-CCD TV -MS is successful and it can be used for all tests of the functions and parameters of the TV -MS. The main innovations are to realize the fast veracious measure of technical parameters of the dual-CCD TV-MS and integrate the technologies of optics machineries and electronics. An advanced means is provided to judge the technical states find malfunctions and discover the reasons in producing and maintaining process. The equipment suited for anti-tank missile systems is given.

Classifications of credit cardholder behavior by using fuzzy linear programming 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF INFORMATION TECHNOLOGY & DECISION MAKING, 2004, 卷号: 3, 期号: 4, 页码: 633-650
作者: He, J; Liu, XT; Shi, Y; Xu, WX; Yan, N

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收藏 | 浏览/下载：23/0 | 提交时间：2018/07/30

data mining classification fuzzy linear programming satisfying solution credit card bankruptcy