Study on the Low-Dimensional Embedding and the Embedding Dimensionality of Manifold of High-Dimensional Data (original) (raw)

地理信息大数据在国土空间规划中的应用研究

智能城市应用, 2020

在当前时期,科技发展的速度持续加快,很多的行业已经对大数据予以应用,这就使得自身的发展更为稳健。我们国家对国土空间规划是十分重视的,此项工作和国民基础建设存在紧密的关联性,在展开生态文明建设时,此项工作也是十分关键的,所以说,必须要针对数据规划展开更为深入的研究,这样方可使得空间规划能够获得更为坚实的理论基础。对地理信息大数据展开分析时,将“3S”之类的技术予以充分应用,可以使得规划工作有序展开,预期目标也能够切实达成。

融合梯度信息和邻域点云分布的3D线特征提取与配准

SCIENTIA SINICA Informationis, 2021

Accelerating DNN-based 3D point cloud processing for mobile computing SCIENCE CHINA Information Sciences 62, 212102 (2019); 3D shape classification based on convolutional neural networks fusing multi-view information SCIENTIA SINICA Informationis 49, 436 (2019);

基于局部方差的多分辨率图像分割方法 = Multi-resolution image segmentation method based on local variance

系统工程与电子技术, 2006

An efficient im age segmentation m ethod for complexit y im age is present ed, w hich is developed based on t he evolution of local variance in m ult-i resolut ion images for different object s. Th e proposed m ethod f irst int roduces a m ult-i resolut ion model in w h ich pixels betw een diff erent resolut ions are linked by comput ing parent-child distance. T hen t he evolution of local variance across resolut ion is st udied. By count ing the residue of local variance of im age at different resolutions, the dist inction betw een object and back ground is amplif ied. A fter a blurring procedure, t he residue is segm ented w ith Ostu threshold met hod. Finally, the segm entat ion result of original im age is obtained th rough project ion w ith parent-child link. T he experiment al result s show the excellent performance of t he new m ethod.

Investigation on the Effect of Road Width on the Inherent Characteristics of FDM Plates

Journal of Mechanical Engineering, 2019

:Fused deposition modeling (FDM) is a fast growing rapid prototyping technology due to its ability to build functional parts having complex geometrical shapes in reasonable build time. However, the built parts are hardly comparable to those produced by the traditional means in vibration property, which is one of the most obvious defects that hinder the development of rapid prototyping technology. With the increasingly wide application of FDM products, a more practical analysis of vibration characteristics is needed urgently. The effect of road width on the inherent characteristics of FDM 3D printing plates is studied, and the mechanism is revealed. Based on the classical laminated plate theory, the FDM plates with cantilever boundary conditions are taken into account, and the mode shapes are represented by the combination method of bi-directional beam function. The results are solved through the Ritz method. The specific process for predicting the inherent characteristics of the FDM plate by the theoretical method is thus provided. At the same time, the corresponding testing system is set up, measuring the natural frequency and mode shapes of the FDM plate. Finally, the predictions of the inherent characteristics are compared with the measurements, validating the reliability of the proposed theoretical model. In addition, the theoretical basis and technical support for further research on improving the dynamic performance of FDM products are provided.

Design of large-scalemulti-channel seismic physical modeling system and its implementation

LITHOLOGIC RESERVOIRS , 2016

As an actual physical stimulation technique, seismic physical modeling technology is of great significance to actual seismic exploration. Aimed at the complicated targets of seismic exploration, the existing seismic physical simulation equipment's are difficult to meet the demand of deep and wide azimuth seismic simulation. A new type of seismic physical modeling system was designed from three aspects of physical model positioning, ultrasonic signal acquisition and physical modeling. The system can achieve high precision positioning of large-scale physical model, ultrasonic signal acquisition with multi-channel, high efficiency, high signal to noise ratio and high resolution, as well as high precision model form scanning and other functions. Combined with the specific physical model experiment, the indicators and function of the modeling system could meet the design requirements. This modeling system could provide an effective experimental platform for guiding the practical production and the study of seismic exploration theory.

Algorithm Design of Restoring Two-Way Single/Double-Sized Shredded Documents

Advances in Applied Mathematics, 2016

This paper designs an algorithm to restore English shredded documents no matter they are singlesized or double-sized text files which are cut both vertically and horizontally. Firstly, we cluster the fragments which were located in the same line in original text files according to the structural features of English letters and the row spacing. Then, using l 1 norm difference model, we attach the fragments in the same class. By this way, the scraps of paper in the same line can be restored as a whole crosscutting shredded document. Finally, we should splice the crosscutting shredded documents into a complete image. In the numerical test part, taking the 2013 national mathematics model contest problem as examples, our algorithm restores 209 pieces of English shredded documents. Numerical results show that the correct rate of clustering is over 93% which demonstrates the efficiency of the algorithm.