中国科学院机构知识库网格系统: 检索

Automatic Cloud Detection for All-Sky Images Using Superpixel Segmentation 期刊论文 OAI收割
IEEE Geosci. Remote Sensing Lett, 2015, 期号: 2, 页码: 354-358
作者: Liu,Shuang; Zhang,Linbo; Zhang,Zhong; Wang,Chunheng; Xiao,Baihua

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收藏 | 浏览/下载：19/0 | 提交时间：2018/01/04

Cloud Detection Superpixel Segmentation (Sps) Threshold Matrix

Adaptive deformation estimation of moving target by weight image analysis (EI CONFERENCE) 会议论文 OAI收割
2010 2nd International Conference on Future Computer and Communication, ICFCC 2010, May 21, 2010 - May 24, 2010, Wuhan, China
Bai X.-G.; Dai M.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

An algorithm based on weight image analysis is proposed for adaptive deformation estimation of moving target in mean-shift tracking method. At the first we get the weight image from the target candidate region. Then we analyze the differences between the object and background. According to that the area estimation of the target can be converted into the image segmentation task. To realize the adaptive segmentation and estimation we define the threshold as the maximum variance between object and background. Combining the estimated area and covariance matrix we can estimate the width height and orientation of the object. The experimental results on three representative video sequences validate its robustness to the deformable estimation of the targets. 2010 IEEE.

Affine object recognition and affine parameters estimation based on covariant matrix (EI CONFERENCE) 会议论文 OAI收割
2008 International Symposium on Information Science and Engineering, ISISE 2008, December 20, 2008 - December 22, 2008, Shanghai, China
作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：150/0 | 提交时间：2013/03/25

A new method of affine object recognition and affine parameters estimation is presented. For a real-time image and a group of templates in addition firstly on the basis of correct recognition we segment the object regions in them and compute their covariant matrices. Secondly it can estimate affine parameters exactly normalize the ellipse regions defined by covariant matrices to circle regions to get rotational invariants and the estimated error is within 3%. 2008 IEEE. and compute the similarity function value between rotational invariants of real-time image and every template respectively. Then compare the values with threshold set in advance if more than one value is larger than threshold take the corresponding templates as candidates and compute affine matrix between real-time image and every candidate. Finally transform the realtime image with every affine matrix and match the result with corresponding candidate by classical matching methods. Experimental results show that the presented method is robust to illumination with low computational complexity and it can realize recognition of different affine objects

Design of an improved data signal timing for an amorphous silicon active-matrix organic LED display (EI CONFERENCE) 会议论文 OAI收割
ICO20: Display Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China
作者: Zhang Z.-W.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

The most critical issue in the design of an active matrix organic light emitting diode (AM-OLED) display pixel is the pixel to the pixel luminance uniformity. By substituting four-thin film transistor (TFT) pixel circuit for two-TFT pixel circuit the luminous uniformity has great improved but it requires more components than the two-TFT pixel circuit. There are some barriers needed to resolve to utilize hydrogenated amorphous silicon transistor to lit OLED such as low field effect mobility low output current and threshold voltage shift. In this article a two-a-Si:H TFT pixel circuit was designed which consisted of one named switching TFT and the other named driving TFT. The driving TFT gate line structure modified and a data signal timing improved were reported. The modified driving TFT can provide enough current about 30 microampere to lit OLED and the novel data signal timing can provide a constant current to OLED by restraining the driving TFT threshold voltage variation. In the novel data signal timing the control signals to the driving TFT gate include a data signal and a reverse data signal. The signals alteration is performed either at a frame rate or at a line rate. By experiments the driving TFT output current value is plotted as a function of the time in different reversed voltage value. When the magnitude of the positive data signal and the negative data signal is equal the variety of Vth is smallest about 1.28V after a fixed stressing time of 1.33104min which shows the novel data signal timing can improved the driving TFT output-input current stability.

Optical characteristics of DBR with inhomogeneous graded interfaces 期刊论文 OAI收割
acta physica sinica, 2006, 卷号: 55, 期号: 10, 页码: 4983-4986
Wang XD (Wang Xiao-Dong); Wu XM (Wu Xu-Ming); Wang Q (Wang Qing); Cao YL (Cao Yu-Lian); He GR (He Guo-Rong); Tan MQ (Tan Man-Qing)

收藏 | 浏览/下载：42/0 | 提交时间：2010/04/11

DBR reflectance spectrum reflective phase shift characteristic matrix method SURFACE-EMITTING-LASERS DISTRIBUTED BRAGG REFLECTORS THRESHOLD

Theoretical analysis of 980nm high power Vertical External-cavity Surface-emitting Semiconductor Laser (VECSEL) (EI CONFERENCE) 会议论文 OAI收割
ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang L.-J.; Wang L.-J.; Ning Y.-Q.; Qin L.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

By using bottom-emitting structure we will develop laser diode (LD) pumped 980 nm VECSEL with active region of InGaAs/GaAsP/AlGaAs system. Because the thickness of barrier layer and absorption layer exceed that of quantum well single well approximation model (KP method) can be used to calculate the band structure of VECSEL. The Schrodinger equation of finite deep potential well can be adopted to calculate the energy level structures of electron heavy and light holes. According to the transition selection rule we theoretically obtained the emitting wavelength of VECSEL and calculated quasi-Femi energy of valence band and conduction band based on the analysis of energy level structure of electron and holes. By analyzing the gain of strained quantum wells we calculated the gain of VECSEL using transition matrix elements of electron heavy and light holes. We give out the threshold gain output power and other characteristic parameters. We will study the configuration of VECSEL and pumping scheme. We designed external cavity mirror active region and bottom-emitting structure. A LD-pumped vertical external cavity surface-emitting laser whose output power is greater than 1.0 W can be predicted.

Monitoring and analysis of changes of wetlands and tidal flat environment in the Yangtze River estuary 会议论文 OAI收割
IGARSS 2005: IEEE International Geoscience and Remote Sensing Symposium, Vols 1-8, Proceedings, New York
Liu, J; Yang, K; Fan, X; Shao, Y; Song, Y

收藏 | 浏览/下载：14/0 | 提交时间：2014/12/07

wetlands tidal flats LUCC Change Vector Analysis Markov Matrix threshold

Creep deformation characteristics of discontinuously reinforced aluminium-matrix composites 期刊论文 OAI收割
Composites Science and Technology, 2001, 卷号: 61, 期号: 5, 页码: 771-786
Z. Y. Ma; S. C. Tjong

收藏 | 浏览/下载：19/0 | 提交时间：2012/04/14

metal-matrix composites (MMCs) particle-reinforced composites creep mechanical properties stress exponent high-temperature creep solid-solution alloys sic-al composites in-situ al2o3 dislocation climb particle reinforcement threshold stresses steady-state hard particles subgrain size

Thermal failure mechanism and threshold of particulate reinforced metal matrix composites induced by laser beam 会议论文 OAI收割
International Symposium of Young Scholars on Mechanics and Material Engineering for Science and Experiments, Changsha, Hunan, China, 2001-8-1
作者: Duan ZP(段祝平)

收藏 | 浏览/下载：27/0 | 提交时间：2014/02/14

Thermal failure particulate-reinforced metal matrix composites laser beam failure threshold

High temperature creep behavior of in-situ TiC particulate reinforced Fe-Cr-Ni matrix composite 期刊论文 OAI收割
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 2000, 卷号: 282, 期号: 1-2, 页码: 187-192
X. D. Hui; Y. S. Yang; Z. F. Wang; G. Q. Yuan; X. C. Chen

收藏 | 浏览/下载：14/0 | 提交时间：2012/04/14

Fe-Cr-Ni matrix composite in situ TiC particulate high temperature creep threshold stress dislocation mechanism liquid-iron alloys precipitation