中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
机构
采集方式
内容类型
发表日期
学科主题
筛选

浏览/检索结果: 共8条,第1-8条 帮助

条数/页: 排序方式:
An index and retrieval framework integrating perceptive features and semantics for multimedia databases 期刊论文  OAI收割
MULTIMEDIA TOOLS AND APPLICATIONS, 2009, 卷号: 42, 期号: 2, 页码: 207-231
作者:  
Shi, Zhiping;  He, Qing;  Shi, Zhongzhi
  |  收藏  |  浏览/下载:14/0  |  提交时间:2019/12/16
Three-dimensional angle measurement based on auto-collimation and moire fringe (EI CONFERENCE) 会议论文  OAI收割
2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, November 16, 2008 - November 19, 2008, Beijing, China
Cai S.; Liang S.; Qiao Y.-F.
收藏  |  浏览/下载:28/0  |  提交时间:2013/03/25
A method for small three-dimensional (3D) angle measurement based on auto-collimation and moire fringe is proposed and analyzed. A right-angle prism is used as the indicator of angle change. The inclined plane indicates the pitch and yaw angles and roll angle in indicated by the rib which is the intersection of two right-angle sides. Pitch and yaw angles measurement are implemented by auto-collimation based on reticule and roll angle measurement is measured based on moire fringe. Roll angle measurement is separated from pitch and yaw by using two light sources with different frequencies. Any small change of pitch and roll angles will induce the shift of the reticule image after reflecting by inclined plane. And any small roll angle will induce a change in moire fringe width that is generated by scale grating image which is reflected by the prism and index grating. The math model of this method is built up and error analysis is presented. The theoretical calculation results show that the proposed method is feasible and can achieve high accuracy. 2009 SPIE.  
Using one-dimensional nonlinear photonic crystal for dynamical addressing optical interconnection (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:  
Li C.;  Wang W.;  Wang W.;  Li C.;  Li C.
收藏  |  浏览/下载:35/0  |  提交时间:2013/03/25
Optical interconnection is the key technique of high-speed optical information process and optical communication. A lot of approaches for optical interconnection have been proposed since Goodman in Stanford University firstly proposed the optical interconnection for very large scale integrated circuits technology. A dynamical addressing device for optical interconnection was designed and fabricated in this paper. This optical device is based on one-dimensional nonlinear photonic crystal made on the planar waveguide. The nonlinear materials ZnS and ZnSe  which have large nonlinear refractive index coefficients  were alternately deposited on the waveguide to form one-dimensional photonic crystal. The Bragg condition is changed when the input power of the control light increased due to the nonlinear characters of the materials  thus the reflective angle of the signal light can be changed with the input power change of the control light. In our experiment  when increasing the power density of control light from 0 to 2.60X105W/cm 2  the angle of the signal beam can be changed about 20. The interconnection characteristics were investigated in theory and in experiment. The testing data agree well with theoretical predictions. This kind of devices is promising to use in the all-optical interconnection  optical information processing and optical communication.  
Semantics supervised cluster-based index for video databases 期刊论文  OAI收割
IMAGE AND VIDEO RETRIEVAL, PROCEEDINGS, 2006, 卷号: 4071, 页码: 453-462
作者:  
Shi, Zhiping;  Li, Qingyong;  Shil, Zhiwei;  Shil, Zhongzhi
  |  收藏  |  浏览/下载:18/0  |  提交时间:2019/12/16
Two-dimensional ordering of self-assembled inxgal-xas quantum dots grown on gaas(311)b surfaces 期刊论文  iSwitch采集
Journal of crystal growth, 1999, 卷号: 206, 期号: 4, 页码: 279-286
作者:  
Xu, HZ;  Jiang, WH;  Xu, B;  Zhou, W;  Wang, ZG
收藏  |  浏览/下载:47/0  |  提交时间:2019/05/12
Two-dimensional ordering of self-assembled inxga1-xas quantum dots grown on gaas(311)b surfaces 期刊论文  iSwitch采集
Journal of crystal growth, 1999, 卷号: 205, 期号: 4, 页码: 481-488
作者:  
Xu, HZ;  Jiang, WH;  Xu, B;  Zhou, W;  Wang, ZG
收藏  |  浏览/下载:61/0  |  提交时间:2019/05/12
Two-dimensional ordering of self-assembled InxGa1-xAs quantum dots grown on GaAs(311)B surfaces 期刊论文  OAI收割
journal of crystal growth, 1999, 卷号: 205, 期号: 4, 页码: 481-488
作者:  
Xu B
收藏  |  浏览/下载:70/0  |  提交时间:2010/08/12
Two-dimensional ordering of self-assembled InxGal-xAs quantum dots grown on GaAs(311)B surfaces 期刊论文  OAI收割
journal of crystal growth, 1999, 卷号: 206, 期号: 4, 页码: 279-286
作者:  
Xu B
收藏  |  浏览/下载:51/0  |  提交时间:2010/08/12