中国科学院机构知识库网格系统: 检索

Cogeneration research and practice of teaching (EI CONFERENCE) 会议论文 OAI收割
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012, April 21, 2012 - April 23, 2012, Three Gorges, China
作者: Xiong W.-Z.

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According to the "cogeneration" curriculum characteristics combined with the teaching practice the teaching difficulty undertakes an analysis put forward the teaching methods and suggestions. Hope that through this curriculum teaching the students after graduation design and work to achieve good effect to improve the quality of teaching to deepen the understanding of curriculum knowledge system. 2012 IEEE.

The design and implementation of temperature acquisition system based on PXI (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Control Engineering and Communication Technology, ICCECT 2012, December 7, 2012 - December 9, 2012, Shenyang, Liaoning, China
作者: Wang J.

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This paper introduces the design of temperature acquisition system which is based on the PXI-6251 DAQ device thermocouple acquisition module SCXI-1102 and the LabVIEW program language of NI. The design of temperature collection software and the configuration of hardware are described in details. The software developed in LabVIEW program language can acquire temperature data rapidly what's more the acquired data can be displayed real timely and saved to the disk. It is proved that the system is easy to practical use and can extraction mean square value and mean value after gathering the stable high-speed temperature. The function can be extended according to the demands of users. 2012 IEEE.

The electromagnetic compatibility design of restrained image transmission equipments (EI CONFERENCE) 会议论文 OAI收割
2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China
作者: Wang W.; Wang W.

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In order to improve the quality of image transmission this paper puts forward a box shielding method that could eliminate electromagnetic interference signal on image transmission equipments. At first this paper analyzes the shielding effectiveness of electromagnetic interference selects the qualified shielding material and designs the structure. After that it analyzes the descending of shielding effectiveness in the operational system and improves the equipments shielding effectiveness by means of the electromagnetic compatibility design that accords with electromagnetic compatibility norms. At last through the EMI radiometry this paper confirms that the equipments are in accordance with the design requirements of electromagnetic compatibility norms. (2012) Trans Tech Publications Switzerland.

Design and calibration of the solar irradiance monitor (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
作者: Yang D.-J.; Gong C.-H.; Wang Y.-P.; Ye X.; Fang W.

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The solar irradiance monitor (SIM) with the design accuracy of 5 used to monitor the secular changes of the total solar irradiance on FY-3 satellite takes the sun-scanning measurement method on-orbit. Compared to the sun-tracking measurement method this method simplifies the structure and cuts the cost but the measuring accuracy is affected by the sun-synchronous orbit sunlight incidence angle and the installing angle of the SIM in the satellite. Through the ground calibration experiment studies on the affection of different sunlight incidence angles to the measurement accuracy. First by the satellite tool kit (STK) simulation software simulates the orbital parameters of the sun-synchronous satellite and calculates the Sun ascension and declination at any time. By the orbit coordinate transformation matrix gets the components of the Sun vectors to the axes of the satellite and base on the components designs the field of view and the installing angles of the SIM. Then designs and completes the calibration experiment to calibrate the affection of the incidence angles. Selecting 11 different angles between the sunlight and the satellite X-axis measures the total solar irradiance by the SIM at each angle and compares to the irradiances of the SIAR reference radiometers and gets the coefficient curves of the three channels of the SIM. Finally by the quadratic fitting gets the correction equations on the incidence angles: R 1=5.7110-52 -2.45310 -3+1.0302 R2=2.8410-5-1. 96510-3+1.0314 and R3 =1.7210 -52-4.18410-4+0.9946. The equations will aimprove the on-orbit measurement accuracy of the solar irradiance and are very important to the on-orbit data processing after the satellite launched. 2011 SPIE.

Dynamic optimum design and analysis of cam wave generator for harmonic gear drive (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Information and Automation, ICIA 2011, June 6, 2011 - June 8, 2011, Shenzhen, China
Xiao Q.; Han X.; Jia H.

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Mathematical models of structural optimization were established for the cam wave generator then a conceptual model by integrally taking its static and dynamic performance into consideration which satisfied the model acted by four concentrated forces while the dynamic optimum design was carried out. The topology optimization of the cam wave generator was performed based on artificial material density method was obtained. And the size optimization of the cam wave generator was also executed based on the zero-order method in software Ansys after setting up its parameterized model. The optimized results indicate that its final volume declines to 1284.217mm3 from its 1397.830mm3 which reduced by 42.18% than the original volume of cam (2221.224mm3). Simultaneously the static analysis and modal analysis were implemented and the results show that the static and dynamic performance complies with the design requirements proving that the results of dynamic optimum design are reasonable. The optimized results in paper are realizable in engineering. And the study method provides not only a reference to decreasing design mass and lowering inertia of the cam wave generator but also an important basis of lightweight design of harmonic gear drive. 2011 IEEE.

Integrated context tacit knowledge manage model (EI CONFERENCE) 会议论文 OAI收割
2011 7th International Conference on Natural Computation, ICNC 2011, July 26, 2011 - July 28, 2011, Shanghai, China
作者: Liu G.; Wang Y.-C.; Wang Y.-C.

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Aimed at solving the practical problem about the difficult in the acquirement the transformation and the sharing of the tacit knowledge this paper have constructed a integrated context tacit knowledge modelCTKM and the paper is based on the conclusion that knowledge is the product of certain context the value of the knowledge depends on its context. Firstly the model described in this paper fulfills online knowledge mutual platform and it provide a support for the sharing transmission of the knowledge and the collection of tacit knowledge and knowledge context elements. After that the paper constructs a context management model to finish the design of context recognition acquisition scheme and problem-based context modeling. Lastly on the basis of the context model the paper fulfill the acquisition the expression the sharing and the storage in the tacit knowledge management. CTKM model provide a solution of the integrated context for the tacit knowledge management and through the load of context elements achieve the effective sharing of the tacit knowledge. 2011 IEEE.

The research on distortion measurement and compensation technology in photoelectricity measurement system (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Hong F.; Mujun X.; Zhiqian W.

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The distortion made by optical lens largely affect the measurement accuracy of the large field of view photoelectricity measurement system according to the theory of aberration in the photoelectricity system this paper design a series of distortion measurement devices in connection with the process of distortion correction in photoelectricity system establish the related mathmatics model make the real time distortion correction by the method of software compensation. The experimental results demonstrate the method decrease the measurement error made by the photoelectricity system distortion after the compensation in tatal field of view the systematic measurement error is less than 0.5 picture element. 2010 IEEE.

Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang J.; Zhang J.; Zhang J.; Shi G.; Zhang X.

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Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus which means the system MTF is quite insensitive to defocus and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.

Embedded system of time uniform based on DSP (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者: Li N.; Liu C.-X.; Liu C.-X.; Chen J.; Guo L.-H.

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We introduced a design method of DSP-based System of time uniform which combine the GPS and the Compass to calibrate the time. The system can use UTC (Coordinated Universal Time) of the GPS or the Compass for time base to generate absolute time and different frequency of synchronous signals. We used DSP (Digital Signal Processor) to calculate the satellite information which includes the UTC time. After getting the UCT time information put it into the CPLD (Complex Programmable Logic Device) for correction of time delay and serialization to output. Meanwhile we divided 1PPS (one-pulse-per-second) signal of the GPS and the Compass into 20Hz 50Hz and 800Hz synchronous signal. And we analyzed the precision of time and frequency. To conclude the uncertainty of system absolute time is less than 100ns the uncertainty of system synchronous signals is less than 20ns. This system is easy and flexible for use stable and reliable in performance. 2010 IEEE.

The system of 24-channel digital potentiometers based on single-chip microcomputer (EI CONFERENCE) 会议论文 OAI收割
2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China
Song X.-R.; Liu Z.-G.; Wu Z.-Y.; Yu A.-F.

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This paper introduces that using digital potentiometers output 24-channel resistance to simulate the thermistors. Every channel has two digital potentiometers one is low resolution and high value the other is high resolution and low value. They are connected through Daisy-Chain and share chip-select. 24-channel digital potentiometers share the SPI's clock and SDI. Input the parameter in the computer and then send it to the single-chip microcomputer. The single-chip microcomputer receives the parameter and sends it to the digital potentiometers. After correcting the errors the system meets the demands which are resistance range of 040K and maximum error of 15. The design can replace the traditional way in which the mechanical potentiometers are used to simulate the thermistors. 2010 IEEE.