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浏览/检索结果: 共9条，第1-9条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Mathematical modeling of shallow-water flows on steep slopes 期刊论文 JOURNAL OF HYDROLOGY AND HYDROMECHANICS, 2019, 卷号: 67, 期号: 3 作者:  Ni, Yufang;  Cao, Zhixian;  Liu, Qingquan 收藏  |  浏览/下载：10/0  |  提交时间：2019/12/05 2D shallow-water equations  Steep slopes  Dam-break flows  Rectangular Cartesian coordinate system  Global coordinates   Data normalization of single camera visual measurement network system (EI CONFERENCE) 会议论文 2012 International Conference on Information Technology and Management Innovation, ICITMI 2012, November 10, 2012 - November 11, 2012, Guangzhou, China Zhou J.; Li S.-J.; Huang D.-Y.; Chen X.-L.; Zhang Y.-C. 收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25 With the development of visual measurement system  Normalize the measured coordinates into the same world coordinate system  Apply in the three coordinate measuring machine(CMM) to have the simulation experiment  So the data normalization has the advantage of more high precision. (2013) Trans Tech Publications  the visual measurement system of single camera which applied in the imaging theory of optical feature points  then get the global data  the result indicates that the maximum absolute tolerance between the normalization coordinates via the center of point set and the ones measured by CMM directly is 0.058mm  Switzerland.  it has been widespread used in the modern production. Due to the limit of the environment in scene  and achieve the overall measurement  the visual measurement system of single camera could not measure the shield between the measured objects each other. Focus on this problem  But the one between the coordinate repeatedly measured at the position of one network control point is 0.066mm  present a kind of the the knowledge of measurement network based on the visual measurement of single camera  set up the measurement network system via the multi-control points. Measure the optical feature points in every network control point via the visual measurement system of single camera   A shape context based Hausdorff similarity measure in image matching 会议论文 5th International Symposium on Photoelectronic Detection and Imaging (ISPDI) - Infrared Imaging and Applications, Beijing, June 25-27, 2013 作者:  Ma TL(马天磊);  Liu YP(刘云鹏);  Shi ZL(史泽林);  Yin J(尹健) 收藏  |  浏览/下载：24/0  |  提交时间：2013/12/26 The traditional Hausdorff measure, which uses Euclidean distance metric (L2 norm) to define the distance between coordinates of any two points, has poor performance in the presence of the rotation and scale change although it is robust to the noise and occlusion. To address the problem, we define a novel similarity function including two parts in this paper. The first part is Hausdorff distance between shapes which is calculated by exploiting shape context that is rotation and scale invariant as the distance metric. The second part is the cost of matching between centroids. Unlike the traditional method, we use the centroid as reference point to obtain its shape context that embodies global information of the shape. Experiment results demonstrate that the function value between shapes is rotation and scale invariant and the matching accuracy of our algorithm is higher than that of previously proposed algorithm on the MEPG-7 database.   Numerical simulations for adaptive optics system (EI CONFERENCE) 会议论文 31st Chinese Control Conference, CCC 2012, July 25, 2012 - July 27, 2012, Hefei, China Yang X.-X.; Yin Y.-M.; Wang X.-J. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 The simulation methods for the adaptive optics (AO) system are studied. Based on the global structure of the AO system  the key principles for each module are first discussed systematically  including the wave propagation principles  wave-front representation  coordinates transformation between the coordinates considered  wave-front reconstruction algorithm and DM principles. The purpose of these discussions is to establish the theoretical foundations for the numerical simulations of the AO system. Then the simulation steps are described in detail and a series of numerical simulation results are given which validate the effectiveness of our simulation work. 2012 Chinese Assoc of Automati.   Development of a 3D full-field monitoring system for large-scale static deformation based on Close Range Photogrammetry 会议论文 作者:  Liu Jian-wei;  Jiang ZHi-qiang;  Liu Yuan-peng;  Hu Hao 收藏  |  浏览/下载：4/0  |  提交时间：2019/12/10 3D Full-field monitoring system  Coordinates global registration  Large-scale structures  Close Range Photogrammetry  static deformation   Mechanical impact feature extraction method based on nonlinear manifold learning of continuous wavelet coefficients 期刊论文 Zhendong yu Chongji/Journal of Vibration and Shock, 2012, 卷号: 31, 期号: [db:dc_citation_issue], 页码: 106-111+126 作者:  Li, Mao-Lin;  Liang, Lin;  Wang, Sun-An;  Zhuang, Jian 收藏  |  浏览/下载：6/0  |  提交时间：2019/12/10 Continuous wavelet  Continuous wavelet transformation  Feature extraction methods  Frequency spectra  Global coordinates  Local tangent space alignment  Mechanical impacts  Non-linear manifold learning   Environment modeling of AS-R robot based on BP Neural Network (EI CONFERENCE) 会议论文 2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China Xie M.-J.; Yu X.-L.; Wang Z.-Q. 收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25 There are some limitations when environment model of AS-R mobile robot is obtained by only using a separate CCD camera or ultrasonic sensor array. The BP neural network is designed to fuse information of the two sensors to obtain the robot's environment model in this paper. The input of BP neural network is the intercept and slope of the edge line obtained CCD camera and ultrasonic sensor arrays  which is processed by through the global coordinates of coordinate transformation. The output of BP network is the fused intercept and slope of the straight edge. Experiment shows that environment model is feasible for the AS-R mobile robot and the environment modeling method has more reliability and accuracy. 2010 IEEE.   Asymptotic Behavior of Global Classical Solutions to the Mixed Initial-Boundary Value Problem for Quasilinear Hyperbolic Systems with Small BV Data 期刊论文 JOURNAL OF ELASTICITY, 2010, 卷号: 98, 页码: 25-64 作者:  Shao, Zhi-Qiang 收藏  |  浏览/下载：2/0  |  提交时间：2019/11/26 Traveling wave  Normalized coordinates  Global classical solution  Mixed initial-boundary value problem  Linear degeneracy  Asymptotic behavior  Quasilinear hyperbolic system   GLOBAL WEAKLY DISCONTINUOUS SOLUTIONS TO THE MIXED INITIAL-BOUNDARY VALUE PROBLEM FOR QUASILINEAR HYPERBOLIC SYSTEMS 期刊论文 MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES, 2009, 卷号: 19, 页码: 1099-1138 作者:  Shao, Zhi-Qiang 收藏  |  浏览/下载：2/0  |  提交时间：2019/11/26 Quasilinear hyperbolic system  mixed initial-boundary value problem  global weakly discontinuous solution  weakly linear degeneracy  normalized coordinates