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Ruppert's Delaunay Triangulation Refinement Scheme for Optimal RSUs Placement in Vehicle to Infrastructure Communication Network
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作者 Selvakumari P Chinnasamy A +1 位作者 Sree Rathna Lakshmi NVS Sheela D 《China Communications》 SCIE CSCD 2023年第7期303-320,共18页
Road Side Units(RSUs)are the essential component of vehicular communication for the objective of improving safety and mobility in the road transportation.RSUs are generally deployed at the roadside and more specifical... Road Side Units(RSUs)are the essential component of vehicular communication for the objective of improving safety and mobility in the road transportation.RSUs are generally deployed at the roadside and more specifically at the intersections in order to collect traffic information from the vehicles and disseminate alarms and messages in emergency situations to the neighborhood vehicles cooperating with the network.However,the development of a predominant RSUs placement algorithm for ensuring competent communication in VANETs is a challenging issue due to the hindrance of obstacles like water bodies,trees and buildings.In this paper,Ruppert’s Delaunay Triangulation Refinement Scheme(RDTRS)for optimal RSUs placement is proposed for accurately estimating the optimal number of RSUs that has the possibility of enhancing the area of coverage during data communication.This RDTRS is proposed by considering the maximum number of factors such as global coverage,intersection popularity,vehicle density and obstacles present in the map for optimal RSUs placement,which is considered as the core improvement over the existing RSUs optimal placement strategies.It is contributed for deploying requisite RSUs with essential transmission range for maximal coverage in the convex map such that each position of the map could be effectively covered by at least one RSU in the presence of obstacles.The simulation experiments of the proposed RDTRS are conducted with complex road traffic environments.The results of this proposed RDTRS confirmed its predominance in reducing the end-to-end delay by 21.32%,packet loss by 9.38%with improved packet delivery rate of 10.68%,compared to the benchmarked schemes. 展开更多
关键词 road side units(RSUs) ruppert’s delau-nay triangulation refinement area of global coverage optimal RSUs placement
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Determining beam transverse absolute position by triangulation of multi-electrode signal phase differences
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作者 Xing Yang Hong‑Shuang Wang +1 位作者 Yi‑Mei Zhou Yong‑Bin Leng 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第8期38-47,共10页
Accurate measurement of the transverse position of a beam is crucial in particle accelerators because it plays a key role in determining the beam parameters.Existing methods for beam-position measurement rely on the d... Accurate measurement of the transverse position of a beam is crucial in particle accelerators because it plays a key role in determining the beam parameters.Existing methods for beam-position measurement rely on the detection of image currents induced on electrodes or narrow-band wake field induced by a beam passing through a cavity-type structure.However,these methods have limitations.The indirect measurement of multiple parameters is computationally complex,requiring external calibration to determine the system parameters in advance.Furthermore,the utilization of the beam signal information is incomplete.Hence,this study proposes a novel method for measuring the absolute electron beam transverse position.By utilizing the geometric relationship between the center position of the measured electron beam and multiple detection electrodes and by analyzing the differences in the arrival times of the beam signals detected by these electrodes,the absolute transverse position of the electron beam crossing the electrode plane can be calculated.This method features absolute position measurement,a position sensitivity coefficient independent of vacuum chamber apertures,and no requirement for a symmetrical detector electrode layout.The feasibility of this method is validated through numerical simulations and beam experiments. 展开更多
关键词 Electron beam bunch-by bunch diagnostics Bunch position measurement triangulation method Bunch phase Bunch-by-bunch Transverse position Pickup signal
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Application of the Delaunay triangulation interpolation in distortion XRII image 被引量:2
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作者 李元金 舒华忠 +3 位作者 罗立民 陈阳 王涛 岳座刚 《Journal of Southeast University(English Edition)》 EI CAS 2014年第3期306-310,共5页
To alleviate the distortion of XRII X-ray image intensifier images in the C-arm CT computer tomography imaging system an algorithm based on the Delaunay triangulation interpolation is proposed.First the causes of the ... To alleviate the distortion of XRII X-ray image intensifier images in the C-arm CT computer tomography imaging system an algorithm based on the Delaunay triangulation interpolation is proposed.First the causes of the phenomenon the classical correction algorithms and the Delaunay triangulation interpolation are analyzed.Then the algorithm procedure is explained using flow charts and illustrations. Finally experiments are described to demonstrate its effectiveness and feasibility. Experimental results demonstrate that the Delaunay triangulation interpolation can have the following effects.In the case of the same center the root mean square distances RMSD and standard deviation STD between the corrected image with Delaunay triangulation interpolation and the ideal image are 5.760 4 ×10 -14 and 5.354 2 ×10 -14 respectively.They increase to 1.790 3 2.388 8 2.338 8 and 1.262 0 1.268 1 1.202 6 after applying the quartic polynomial model L1 and model L2 to the distorted images respectively.The RMSDs and STDs between the corrected image with the Delaunay triangulation interpolation and the ideal image are 2.489 × 10 -13 and 2.449 8 ×10 -13 when their centers do not coincide. When the quartic polynomial model L1 and model L2 are applied to the distorted images they are 1.770 3 2.388 8 2.338 8 and 1.269 9 1.268 1 1.202 6 respectively. 展开更多
关键词 XRII image Delaunay triangulation interpolation distortion correction
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Introducing tree neighbouring relationship factors in forest pattern spatial analysis:weighted Delaunay triangulation method 被引量:5
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作者 Jianjun Li Kaiwen Zhu +4 位作者 Shuai Liu Dan Li Gui Zhang Xing Liu Weiming Yang 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第5期1941-1951,共11页
It is important to quantify and analyze forest spatial patterns for studying biological characteristics,population interaction and the relationship between the population and environment.In this study,the forest spati... It is important to quantify and analyze forest spatial patterns for studying biological characteristics,population interaction and the relationship between the population and environment.In this study,the forest spatial structure unit was generated based on the Delaunay triangulation model(DTM),and the weights were generated using the comprehensive values of the tree diameter at breast height,total height and crown width.The distance between neighbors determined by the DTM was weighted to transform the original coordinates of trees into logical coordinates.Then,a weighted spatial pattern(WSP)was developed.After weighting,the neighboring trees were replaced,the replacement ratio was 38.3%,and there was 57.4%of the central tree.Correlation analysis showed that the uniform angle index of the WSP was significantly correlated with the tree size standard deviation under uniformity(r=0.932)and randomness(r=0.711).The DTM method not only considers the spatial distance between trees,but also considers the non-spatial attributes of trees.By changing the spatial topological relation between trees,this method further improves the spatial structure measurement of forest. 展开更多
关键词 Delaunay triangulation network model Weighting Tree spatial pattern Tree size standard deviation
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Redesign of a conformal boundary recovery algorithm for 3D Delaunay triangulation 被引量:9
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作者 CHEN Jian-jun ZHENG Yao 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第12期2031-2042,共12页
Boundary recovery is one of the main obstacles in applying the Delaunay criterion to mesh generation. A stan- dard resolution is to add Steiner points directly at the intersection positions between missing boundaries ... Boundary recovery is one of the main obstacles in applying the Delaunay criterion to mesh generation. A stan- dard resolution is to add Steiner points directly at the intersection positions between missing boundaries and triangulations. We redesign the algorithm with the aid of some new concepts, data structures and operations, which make its implementation routine. Furthermore, all possible intersection cases and their solutions are presented, some of which are seldom discussed in the litera- ture. Finally, numerical results are presented to evaluate the performance of the new algorithm. 展开更多
关键词 Boundary recovery Delaunay triangulation Mesh generation Data structure
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COMBINED DELAUNAY TRIANGULATION AND ADAPTIVE FINITE ELEMENT METHOD FOR CRACK GROWTH ANALYSIS 被引量:5
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作者 PramoteDECHAUMPHAI SutthisakPHONGTHANAPANICH ThanawatSRICHAROENCHAI 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2003年第2期162-171,共10页
The paper presents the utilization of the adaptive Delaunay triangulation in the finite element modeling of two dimensional crack propagation problems, including detailed description of the proposed procedure which co... The paper presents the utilization of the adaptive Delaunay triangulation in the finite element modeling of two dimensional crack propagation problems, including detailed description of the proposed procedure which consists of the Delaunay triangulation algorithm and an adaptive remeshing technique. The adaptive remeshing technique generates small elements around crack tips and large elements in the other regions. The resulting stress intensity factors and simulated crack propagation behavior are used to evaluate the effectiveness of the procedure. Three sample problems of a center cracked plate, a single edge cracked plate and a compact tension specimen, are simulated and their results assessed. 展开更多
关键词 Delaunay triangulation adaptive mesh finite element method stress intensity factors crack propagation
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三角互证(Triangulation)研究方法在教育学研究中的应用 被引量:5
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作者 谢立欣 《中国校外教育》 2013年第7期105-105,167,共2页
人种学研究中的三角互证(Triangulation)研究方法也可以应用到教育学的研究中,目的是提高研究结果的可信度和有效性。本文将结合笔者的研究经验,讨论三角互证研究方法三个阶段以及研究手段:观察、使用调查问卷以及访问,从而进一步阐释... 人种学研究中的三角互证(Triangulation)研究方法也可以应用到教育学的研究中,目的是提高研究结果的可信度和有效性。本文将结合笔者的研究经验,讨论三角互证研究方法三个阶段以及研究手段:观察、使用调查问卷以及访问,从而进一步阐释三角互证如何从三个角度避免单一研究方法所带来的数据局限性。 展开更多
关键词 三角互证(triangulation)观察 调查问卷 访问
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New deghosting method based on generalized triangulation 被引量:5
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作者 Bai Jing Wang Guohong Xiu Jianjuan Wang Xiaobo 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2009年第3期504-511,共8页
A new deghosting method based on the generalized triangulation is presented. First, two intersection points corresponding to the emitter position are obtained by utilizing two azimuth angles and two elevation angles f... A new deghosting method based on the generalized triangulation is presented. First, two intersection points corresponding to the emitter position are obtained by utilizing two azimuth angles and two elevation angles from two jammed 3-D radars (or 2-D passive sensors). Then, hypothesis testing based deghosting method in the multiple target scenarios is proposed using the two intersection points. In order to analyze the performance of the proposed method, the correct association probability of the true targets and the incorrect association probability of the ghost targets are defined. Finally, the Monte Carlo simulations are given for the proposed method compared with the hinge angle method in the cases of both two and three radars. The simulation results show that the proposed method has better performance than the hinge angle method in three radars case. 展开更多
关键词 deghosting generalized triangulation hinge angle distributed radar network hypothesis testing
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DELAUNAY TRIANGULATION METHOD OF CURVED SURFACES BASED ON RIEMANNIAN METRIC 被引量:4
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作者 Zhao Jianjun Wang QifuZhong Yifang Zhou Ji ZhaoYiCAD Center,Huazhong University of Scienceand Technology,Wuhan 430074, China 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第1期91-93,共3页
A method for quality mesh generation of parametric curved surfaces isproposed. It is shown that the main difference between the proposed method and previous ones is thatour meshing process is done completely in the pa... A method for quality mesh generation of parametric curved surfaces isproposed. It is shown that the main difference between the proposed method and previous ones is thatour meshing process is done completely in the parametric domains with the guarantee of meshquality. To obtain this aim, the Delaunay method is extended to anisotropic context of 2D domains,and a Riemannian metric map is introduced to remedy the mapping distortion from object space toparametric domain. Compared with previous algorithms, the approach is much simpler, more robust andspeedy. The algorithm is implemented and examples for several geometries are presented todemonstrate the efficiency and validity of the method. 展开更多
关键词 Mesh generation Riemannian metric Delaunay triangulation Curvedsurfaces
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Triangulation of red sprites observed above a mesoscale convective system in North China 被引量:4
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作者 YongPing Wang GaoPeng Lu +14 位作者 Ming Ma HongBo Zhang YanFeng Fan GuoJin Liu ZheRun Wan Yu Wang Kang-Ming Peng ChangZhi Peng FeiFan Liu BaoYou Zhu BinBin Ni XuDong Gu Long Chen Juan Yi RuoXian Zhou 《Earth and Planetary Physics》 CSCD 2019年第2期111-125,共15页
The triangulation of red sprites was obtained, based on concurrent observations over a mesoscale convective system(MCS) in North China from two stations separated by about 450 km. In addition, broadband sferics from t... The triangulation of red sprites was obtained, based on concurrent observations over a mesoscale convective system(MCS) in North China from two stations separated by about 450 km. In addition, broadband sferics from the sprite-producing lightning were measured at five ground stations, making it possible to locate and identify the individual causative lightning discharges for different elements in this dancing sprite event. The results of our analyses indicate that the sprites were produced above the trailing stratiform region of the MCS, and their parent strokes were located mainly in the peripheral area of the stratiform. The lateral offset between sprites and causative strokes ranges from a few km to more than 50 km. In a particularly bright sprite, with a distinct halo feature and streamers descending down to an altitude of approximately 48 km, the sprite current signal identified in the electric sferic, measured at a range of about 1,110 km, peaked at approximately 1 ms after the return stroke. 展开更多
关键词 SPRITE triangulation peak current hybrid location
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A new insertion sequence for incremental Delaunay triangulation 被引量:4
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作者 Jian-Fei Liu Jin-Hui Yan S.-H. Lo 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2013年第1期99-109,共11页
Incremental algorithm is one of the most popular procedures for constructing Delaunay triangulations (DTs). However, the point insertion sequence has a great impact on the amount of work needed for the construction ... Incremental algorithm is one of the most popular procedures for constructing Delaunay triangulations (DTs). However, the point insertion sequence has a great impact on the amount of work needed for the construction of DTs. It affects the time for both point location and structure update, and hence the overall computational time of the triangulation algorithm. In this paper, a simple deterministic insertion sequence is proposed based on the breadth-first-search on a Kd-tree with some minor modifications for better performance. Using parent nodes as search-hints, the proposed insertion sequence proves to be faster and more stable than the Hilbert curve order and biased randomized insertion order (BRIO), especially for non-uniform point distributions over a wide range of benchmark examples. 展开更多
关键词 Incremental Delaunay triangulation algorithms Insertion sequences KD-TREE
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ADAPTIVE DELAUNAY TRIANGULATION WITH MULTIDIMENSIONAL DISSIPATION SCHEME FOR HIGH-SPEED COMPRESSIBLE FLOW ANALYSIS 被引量:1
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作者 P.Dechaumphai S.Phongthanapanich 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2005年第10期1341-1356,共16页
Adaptive Delaunay triangulation is combined with the cell-centered upwinding algorithm to analyze inviscid high-speed compressible flow problems. The multidimensional dissipation scheme was developed and included in t... Adaptive Delaunay triangulation is combined with the cell-centered upwinding algorithm to analyze inviscid high-speed compressible flow problems. The multidimensional dissipation scheme was developed and included in the upwinding algorithm for unstructured triangular meshes to improve the computed shock wave resolution. The solution accuracy is further improved by coupling an error estimation procedure to a remeshing algorithm that generates small elements in regions with large change of solution gradients, and at the same time, larger elements in other regions. The proposed scheme is further extended to achieve higher-order spatial and temporal solution accuracy. Efficiency of the combined procedure is evaluated by analyzing supersonic shocks and shock propagation behaviors for both the steady and unsteady high-speed compressible flows. 展开更多
关键词 adaptive meth movement Delaunay triangulation cell-centered upwinding high-speed compressible flow
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Research on Algorithm of the Point Set in the Plane Based on Delaunay Triangulation 被引量:2
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作者 Bin Yang Shuyuan Shang 《American Journal of Computational Mathematics》 2012年第4期336-340,共5页
In the paper, an improved algorithm is presented for Delaunay triangulation of the point-set in the plain. Based on the original algorithm, we propose the notion of removing circle. During the process of triangulation... In the paper, an improved algorithm is presented for Delaunay triangulation of the point-set in the plain. Based on the original algorithm, we propose the notion of removing circle. During the process of triangulation, and the circle dynamically moves, the algorithm which is simple and practical, therefore evidently accelerates the process of searching a new point, while generating a new triangle. Then it shows the effect of the algorithm in the finite element mesh. 展开更多
关键词 Point-Set in the PLANE DELAUNAY triangulation Removing Circle FINITE Element MESH
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Laser triangulation measurement of the level in a coal silo 被引量:2
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作者 Sun Jiping Jiang Jing 《Mining Science and Technology》 EI CAS 2011年第6期881-884,共4页
Laser triangulation theory was used to develop a novel contact-free method for measuring the coal level in a silo under harsh environmental conditions found in coal mines, such as the presence of dense dust, high humi... Laser triangulation theory was used to develop a novel contact-free method for measuring the coal level in a silo under harsh environmental conditions found in coal mines, such as the presence of dense dust, high humidity, and low illumination. A laser source and a camera were mounted at the top of the silo. The laser spot projected into the silo was imaged by the camera. The pinhole imaging principle allows the level to be found from the lateral shift of the spot image on the sensor. A pre-calibrated look-up table of the coal depth versus spot position was used to obtain the depth. The measurement accuracy depends on the step size used during pre-calibration. The actual application of a device designed according to these principles shows that it is easy to implement. The detection of the coal level in a silo at the low illumination level found in coal mines is demonstrated. 展开更多
关键词 Laser triangulation measurement Coal level of coal silo Image segmentation Look-up table
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A Novel Spatial Clustering Algorithm Based on Delaunay Triangulation 被引量:1
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作者 Xiankun Yang Weihong Cui 《Journal of Software Engineering and Applications》 2010年第2期141-149,共9页
Exploratory data analysis is increasingly more necessary as larger spatial data is managed in electro-magnetic media. Spatial clustering is one of the very important spatial data mining techniques which is the discove... Exploratory data analysis is increasingly more necessary as larger spatial data is managed in electro-magnetic media. Spatial clustering is one of the very important spatial data mining techniques which is the discovery of interesting rela-tionships and characteristics that may exist implicitly in spatial databases. So far, a lot of spatial clustering algorithms have been proposed in many applications such as pattern recognition, data analysis, and image processing and so forth. However most of the well-known clustering algorithms have some drawbacks which will be presented later when ap-plied in large spatial databases. To overcome these limitations, in this paper we propose a robust spatial clustering algorithm named NSCABDT (Novel Spatial Clustering Algorithm Based on Delaunay Triangulation). Delaunay dia-gram is used for determining neighborhoods based on the neighborhood notion, spatial association rules and colloca-tions being defined. NSCABDT demonstrates several important advantages over the previous works. Firstly, it even discovers arbitrary shape of cluster distribution. Secondly, in order to execute NSCABDT, we do not need to know any priori nature of distribution. Third, like DBSCAN, Experiments show that NSCABDT does not require so much CPU processing time. Finally it handles efficiently outliers. 展开更多
关键词 SPATIAL DATA MINING DELAUNAY triangulation SPATIAL CLUSTERING
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Layer-Constrained Triangulated Irregular Network Algorithm Based on Ground Penetrating Radar Data and Its Application 被引量:1
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作者 Zhenwu Wang Jianqiang Ma 《Journal of Beijing Institute of Technology》 EI CAS 2018年第1期146-154,共9页
In this paper,a layer-constrained triangulated irregular network( LC-TIN) algorithm is proposed for three-dimensional( 3 D) modelling,and applied to construct a 3 D model for geological disease information based o... In this paper,a layer-constrained triangulated irregular network( LC-TIN) algorithm is proposed for three-dimensional( 3 D) modelling,and applied to construct a 3 D model for geological disease information based on ground penetrating radar( GPR) data. Compared with the traditional TIN algorithm,the LCTIN algorithm introduced a layer constraint to the discrete data points during the 3 D modelling process,and it can dynamically construct networks from layer to layer and implement 3 D modelling for arbitrary shapes with high precision. The experimental results validated this method,the proposed algorithm not only can maintain the rationality of triangulation network,but also can obtain a good generation speed. In addition,the algorithm is also introduced to our self-developed 3 D visualization platform,which utilized GPR data to model geological diseases. Therefore the feasibility of the algorithm is verified in the practical application. 展开更多
关键词 layer-constrained triangulated irregular network geological diseases ground penetrating radar
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基于Monotone Triangulation算法的图像优化技术
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作者 罗昊 《电子技术与软件工程》 2015年第21期100-100,共1页
矢量图形有着无论放大、缩小,文件容量及画质都不会随之改变的特性,常常被应用于动画、漫画播放和用户界面设计以及导航地图等。其画质高文件小的特性非常适合于存储空间紧张的智能手机、平板电脑等移动设备。但安卓系统在矢量图形绘制... 矢量图形有着无论放大、缩小,文件容量及画质都不会随之改变的特性,常常被应用于动画、漫画播放和用户界面设计以及导航地图等。其画质高文件小的特性非常适合于存储空间紧张的智能手机、平板电脑等移动设备。但安卓系统在矢量图形绘制方面,使用的是谷歌自己的skia引擎进行绘图,该函数在进行复杂位图向矢量图转换时有时会出现明显缺陷。本文通过研究该矢量图函数库标准OpenVG来改进其自带的AndroidVG图形算法,希望为今后Android系统设计一个更加完善并且符合OpenVG标准的矢量图转换函数库打下基础。 展开更多
关键词 矢量图 无损缩放 AndroidVG MONOTONE triangulation算法
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Trimmed Surface Triangulation for Aircraft RCS Computation 被引量:1
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作者 HU Bi-fu XI Ping 《Computer Aided Drafting,Design and Manufacturing》 2006年第2期1-6,共6页
An algorithm of trimmed surface triangulation is put forward by using the isoparametric curves of aircraft surfaces to evenly allocate the mesh nodes. Further refinements are made to deal with the trimming loops and e... An algorithm of trimmed surface triangulation is put forward by using the isoparametric curves of aircraft surfaces to evenly allocate the mesh nodes. Further refinements are made to deal with the trimming loops and ensure the mesh consistency. 展开更多
关键词 radar cross section trimmed surface NURBS triangulation
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DELAUNAY TRIANGULATION AND IMAGE DENSE MATCHING IN VIEW SYNTHESIS
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作者 沈沛意 王伟 吴成柯 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1999年第3期45-49,共5页
A new method of view synthesis is proposed based on Delaunay triangulation. The first step of this method is making the Delaunay triangulation of 2 reference images. Secondly, matching the image points using the epipo... A new method of view synthesis is proposed based on Delaunay triangulation. The first step of this method is making the Delaunay triangulation of 2 reference images. Secondly, matching the image points using the epipolar geometry constraint. Finally, constructing the third view according to pixel transferring under the trilinear constraint. The method gets rid of the classic time consuming dense matching technique and takes advantage of Delaunay triangulation. So it can not only save the computation time but also enhance the quality of the synthesized view. The significance of this method is that it can be used directly in the fields of video coding, image compressing and virtual reality. 展开更多
关键词 view synthesis Delaunay triangulation image matching pixel transferring
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Modified Fully Automatic Triangulation of 3-D Solid
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作者 程世才 林国成 王永洁 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1997年第1期110-114,共5页
ModifiedFullyAutomaticTriangulationof3-DSolidCHENGShicaiLINGuochengWANGYongjie(程世才,林国成,王永洁)(RobotResearchins... ModifiedFullyAutomaticTriangulationof3-DSolidCHENGShicaiLINGuochengWANGYongjie(程世才,林国成,王永洁)(RobotResearchinstitute,Harbininst... 展开更多
关键词 程世才 triangulation 王永 MODIFIED SOLID AUTOMATIC Fully
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