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• 长春光学精密机械与... [15]

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• 会议论文 [15]

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浏览/检索结果: 共15条，第1-10条 帮助 限定条件 内容类型：会议论文    专题：长春光学精密机械与物理研究所    第一署名单位    第一作者单位    通讯作者单位     条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择提交时间升序提交时间降序发表日期升序发表日期降序题名升序题名降序作者升序作者降序 Research on applied technology in digital signal processor (DSP) 会议论文  OAI收割 2nd International Conference on Mechanical and Electronic Engineering, ICMEE 2014, June 21, 2014 - June 22, 2014, Wuhan, China Yu X. B.; Zhang Y. F.; Fu Y. G. 收藏  |  浏览/下载：24/0  |  提交时间：2015/04/27 On hyperspectral remotely sensed image classification based on MNF and AdaBoosting (EI CONFERENCE) 会议论文  OAI收割 2012 3rd IEEE/IET International Conference on Audio, Language and Image Processing, ICALIP 2012, July 16, 2012 - July 18, 2012, Shanghai, China 作者:  Yu P.;  Yu P.;  Gao X. 收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25 As an effective statistical learning tool  AdaBoosting has been widely used in the field of pattern recognition. In this paper  a new method is proposed to improve the classification performance of hyperspectral images by combining the minimum noise fraction (MNF) and AdaBoosting. Because the hyperspectral imagery has many bands which have strong correlation and high redundancy  the hyperspectral data are pre-processed by the minimum noise fraction to reduce the data's dimensionality  whilst to remove noise bands simultaneously. Then  we use an AdaBoost algorithm to conduct the classification of hyperspectral remotely sensed image. Experimental results show that the classification accuracy is improved and the time of calculation is reduced as well. 2012 IEEE.   Design and fabrication of imaging optical systems with freeform surfaces (EI CONFERENCE) 会议论文  OAI收割 Current Developments in Lens Design and Optical Engineering XIII, August 13, 2012 - August 15, 2012, San Diego, CA, United states 作者:  Zhang F.;  Wang L.;  Wang L.;  Wang L.;  He X. 收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25 Freeform surfaces provide more degrees of freedom for design of optical systems  and enhance the ability of compensation and correction aberrations. Freeform surfaces are of advantage to balance the unsymmetrical aberrations  especially for the wide-field off-axis optical systems. This paper focus on an off-axis reflective optical system  which focal length is 550mm  F# is 6.5 and field of view (FOV) is 76. The system adopts some freeform surfaces. We discuss the problems we noticed in processes of design  manufacture  measurement and alignment  and the solutions. At last  the periodical research result and the expected performance are given. 2012 SPIE.   Optical characterization of bare CdSe and CdSe/CdS core/shell nanocrystals (EI CONFERENCE) 会议论文  OAI收割 ICO20: Biomedical Optics, August 21, 2005 - August 26, 2005, Changchun, China 作者:  Liu L.;  Yu B.;  Liu L. 收藏  |  浏览/下载：7/0  |  提交时间：2013/03/25 Thiol-capped CdSe/CdS core/shell nanocrystals (NCs) which show high luminescence quantum yield are synthesized in an aqueous solution. UV-Vis absorption spectroscopy and photoluminescence (PL) spectroscopy are employed to analyze optical characters and stabilities of NCs. Furthermore  PL properties are studied in a temperature range between 77K and 300K. The PL peak position of bare CdSe NCs shifts toward shorter wavelengths and the band becomes sharper with decreasing temperature. On the same condition  the PL peak position of CdSe/CdS core/shell NCs keeps unconverted nearly with the variation of temperature. Photostability of bare CdSe NCs and CdSe/CdS core/shell NCs are compared under the 325nm laser irradiation. It takes 78 seconds that the PL intensity declines to the half for CdSe NCs  but 442 seconds for CdSe/CdS core/shell NCs. The fluorescence decay lifetime increases about six times after overcoating. The results indicate that the CdS shell can improve the low temperature PL stability and photostability of CdSe NCs effectively.   Average modulation transfer function two kinds of fiber-optic image bundles 会议论文  OAI收割 2004 作者:  Wang H.;  Wang H.;  Wang H.;  Xiang Y.;  Wang H. 收藏  |  浏览/下载：10/0  |  提交时间：2013/03/28 Radiometric system for measuring spectrum below ocean surface 会议论文  OAI收割 2004 Xu Z. M.; Yu B. X.; Jin X. F. 收藏  |  浏览/下载：8/0  |  提交时间：2013/03/28 An inspecting method of the lifetime of the optical fiber image-transmitting bundle made by the acid-leaching technique 会议论文  OAI收割 2001 Yu F. X.; Guan X. B.; Yu Q. B.; Tang J. L. 收藏  |  浏览/下载：12/0  |  提交时间：2013/03/28 Studies of impurity process in ZnCdSe/ZnSe multiple quantum wells 会议论文  OAI收割 1998 Yu G. Y.; Fan X. W.; Zhang J. Y.; Yang B. J.; Zheng Z. H.; Zhao X. W.; Shen D. Z.; Lu Y. M.; Guan Z. P. 收藏  |  浏览/下载：14/0  |  提交时间：2013/03/28 Photoluminescence characterization of ZnTeSe epilayer at room temperature 会议论文  OAI收割 1998 Zhang J. Y.; Yang B. J.; Yu G. Y.; Fan X. W. 收藏  |  浏览/下载：9/0  |  提交时间：2013/03/28 On-orbit radiance correction for Ocean Color CCD Imager 会议论文  OAI收割 1998 Zheng Y. Q.; Cui D. J.; Yu B. X. 收藏  |  浏览/下载：7/0  |  提交时间：2013/03/28