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Suppression of real power back flow of non-regenerative cascaded H-bridge inverters operating under faulty conditions 会议论文
作者:  Sun, Le;  Wu, Zhenxing;  Xiao, Fei;  Cai, Xinjian
收藏  |  浏览/下载：4/0  |  提交时间：2019/12/02
An Improved morphological component analysis algorithm for Tangka image inpainting 会议论文
Hangzhou, China, December 16, 2013 - December 18, 2013
作者:  Hu, Wen-Jin;  Li, Zhan-Ming;  Liu, Zhong-Min
收藏  |  浏览/下载：8/0  |  提交时间：2020/11/15
Study on image real-time interpretation based on particle filter (EI CONFERENCE) 会议论文
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
Wang Z.-Q.; Liu S.-J.; Geng T.-W.; Shen C.-W.; Yu S.-B.
收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25
In order to satisfy to the real-time requirement of image interpretation system in photoelectric measurement equipments  a kind of hardware acceleration system with MIMD distributed multi-processor architecture based on SOPC technology is designed. The particle filter algorithm is proposed to process image interpretation for state estimation problem of nonlinear and non-Gaussian system. This algorithm does not involve conventional linearization transform  and has approximated the posterior probability density by a set of discrete particles. Therefore the approximate optimum result is educed. It has a high accuracy and a rapid convergence. Experimental results show that the algorithm be adequate to real time  accuracy and robustness  meets the requirement of image interpretation and possesses practical significance for engineering applications. 2011 IEEE.  
Non-uniformity correction in multi-CCD imaging system (EI CONFERENCE) 会议论文
2010 2nd International Conference on Mechanical and Electronics Engineering, ICMEE 2010, August 1, 2010 - August 3, 2010, Kyoto, Japan
Tao M.; Ren J.
收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25
The non-uniformity phenomenon exists in each channel of multi-CCD imaging systems. The factors which lead to the problem are complex. The conventional calibrating algorithms can not consider all of these factors and have poor effects. According to the characters of multi-CCD imaging systems  a non-uniformity correction method based on the scene was proposed by adopting the traditional two-point correction theories. The correction coefficient of each channel image can be calculated via the linear relation between the two neighboring pixel lines in the two-channel images. Compared with the conventional two-point calibration and multi-point calibration methods  contrastive calibrating results were obtained. This method does not need any standard lighted image as reference source  which provides a real time way for calibrating the multi-CCD imaging systems in practical applications. 2010 IEEE.  
Study of adaptive inverse control to stale platform (EI CONFERENCE) 会议论文
International Conference on Computer Science and Software Engineering, CSSE 2008, December 12, 2008 - December 14, 2008, Wuhan, Hubei, China
Li Y.; Ge W.-Q.; Wang S.-B.; Xu Z.-P.
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25
Stable platform is a complicated nonlinear system. The common PID control can not meet the requirement of high precision and fast response. The adaptive inverse control was introduced in the system of stable platform. Based on it  the system utilize its character of open circle to improve system capability. In the model building to object model and object inverse model  the NARX network is used. The algorithm uses the least square method instead of least square(LMS) to identify the parameters and design the control. The simulation results show several advantages of this control strategy  such as sensitive response  non-overshoot  good anti-disturbance  and minimal stable error  and showed dynamic/static performance was superior to those of conventional PID method. 2008 IEEE.  
High power VCSEL device with periodic gain active region (EI CONFERENCE) 会议论文
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
Ning Y. Q.; Qin L.; Sun Y. F.; Li T.; Cui J. J.; Peng B.; Liu G. Y.; Zhang Y.; Liu Y.; Wang L. J.; Cui D. F.; Xu Z. Y.
收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25
High power vertical cavity surface emitting lasers with large aperture have been fabricated through improving passivation  lateral oxidation and heat dissipation techniques. Different from conventional three quantum well structure  a periodic gain active region with nine quantum wells was incorporated into the VCSEL structure  with which high efficiency and high power operation were expected. The nine quantum wells were divided into three groups with each of them located at the antinodes of the cavity to enhance the coupling between the optical field and the gain region. Large aperture and bottom-emitting configuration was used to improve the beam quality and the heat dissipation. A maximum output power of 1.4W was demonstrated at CW operation for a 400m-diameter device. The lasing wavelength shifted to 995.5nm with a FWHM of 2nm at a current of 4.8A due to the internal heating and the absence of active water cooling. A ring-shape farfield pattern was induced by the non-homogeneous lateral current distribution in large diameter device. The light intensity at the center of the ring increased with increasing current. A symmetric round light spot at the center and single transverse mode operation with a divergence angle of 16 were observed with current beyond 4.8A.  
Dispersion compensating properties of microstructure fiber (EI CONFERENCE) 会议论文
ICO20: Optical Communication, August 21, 2005 - August 26, 2005, Changshun, China
Chen M.; Li C.; Wang W.; Xu M.; Xia Y.; Chen S.; Ma S.
收藏  |  浏览/下载：18/0  |  提交时间：2013/03/25
Microstructure fiber is a new kind of optical fiber. An arrangement of air holes running along the full length of the fiber provides the confinement and guidance of light. The light is confined in the silica core along the fiber axis. This fiber has endlessly single mode  special dispersion characteristics and so on. Using a vectorial effective-index numerical method  we investigated the dispersion characteristics of a microstructure fiber with honeycomb cladding structures. The dispersion  dispersion slope  and Kappa parameter can be designed neatly by changing the air hole size and the separation of the holes in fiber cladding. We demonstrated the Microstructure fiber with large absolute value of normal dispersion and negative dispersion slope at the wavelength of 1550nm. Conventional communication non-shifted single-mode fibers and nonzero-dispersion shifted fibers (NZ-DSF) can be compensated efficiently using the microstructure fiber at the wavelength around 1550nm.  
Imaging quality analysis of KBA x-ray microscope working at grazing incidence (EI CONFERENCE) 会议论文
Optical Design and Testing II, November 8, 2004 - November 11, 2004, Beijing, United states
Hu J.; Zhao L.; Li X.; Wu X.; Bai Y.
收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25
In the latest 20 years  x-ray imaging technology has developed fast in order to meet the need of x-ray photo-etching  spatial exploration technology  high-energy physics  procedure diagnosis of inertial confinement fusion (ICF) et al. Since refractive index of materials in the x-ray region is lower than 1  and x-ray is strongly absorbed by materials  it is very difficult to image objects in the x-ray region. Conventional imaging methods are hardly suitable to x-ray range. In general  grazing reflective imaging and coding aperture imaging methods have been adopted more and more. In this paper  according to user's requirement  we have designed a non-coaxial grazing KBA microscope. The microscope consists of two sets of perpendicular spherical mirrors  each set includes two parallel mirrors. Taking it as an example  we have compiled an optical computing program for the non-coaxial grazing imaging systems so as to analyze and evaluate aberrations of KBA microscope. Thus it can help us to get an optimal comprehension of KBA x-ray imaging system. In the same time  the analytical results provide reliable foundation for evaluating imaging quality of KBA microscope.  

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