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作者： Tie-chang MA Tian-bao MA Li HAO State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology School of Science Beijing University of Civil Engineering and Architecture

Finite difference method(FDM) is one of the most popular method for explosion ***-scale,accuracy and automatic grid generation is the essential for numerical *** kinds of grid generation method are wildly used:ray casting method and slicing *** this paper,the ray casting method is optimized and some special cases of algorithm are analyzed,which improved the efficiency and stability for large-scale grid generation.A facet searching method is proposed to improve the performance of ray casting *** efficient data storage method is proposed for storing and visualizing grid data,which makes it possible to display trillions of *** advantages of modified ray casting algorithm are presented through performance comparison between ray casting and slicing method in different ***,examples of grid generation and explosion simulation are *** accuracy and practicability of algorithm is proved.

关键词： Grid generation Numerical simulation Ray casting algorithm slicing algorithm

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Automatic Choroid Layer Segmentation: A slicing Approach 4

Automatic Choroid Layer Segmentation: A Slicing Approach

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4th IEEE International Conference on Progress in Informatics and Computing (IEEE PIC)

作者： Luo, Chengyu North China Elect Power Univ Sch Control & Comp Engn Baoding Hebei Peoples R China

ISBN: (纸本)9781509034840

Optical coherence tomography (OCT) is a powerful and noninvasive imaging technique for eye ground imaging. This method is usually used to assist glaucoma diagnosis nowadays. We propose a novel automated method for the segmentation of choroid layer in OCT image. Our approach is based on normalized cut algorithm, which aims at extracting the global impression of an image and treat image segmentation as a graph partitioning problem. However, due to the complexity of the layer structure of eye ground and choroid layer itself, we employ a series of preprocessing algorithms to make the cut more deterministic and accurate. Furthermore, to make the cutting algorithm focused on cutting in a horizontal manner instead of meaningless vertical cuts, we slice the image into small slices plumb and run the normalized cut algorithm respectively on these slices. After that, we combine them together to get a global cut on the original image. We calculate the thickness of choroid layer, which is a key factor for diagnosis. We used the thickness as the major factor to measure our performance. The mean relative error of the algorithm is about 0.04 compared with manual segmentation performed by oculists. The proposed method was tested on a database including more than eight hundred images of fifty healthy people between 20 and 50 years old.

关键词： Glaucoma Choroid layer OCT images slicing algorithm

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Processing and 3D printing of Gradient Heterogeneous Bio-Model Based on Computer Tomography Images

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IEEE ACCESS 2016年 4卷 8814-8822页

作者： Li, Zongan Yang, Jiquan Wang, Qiong Shi, Jianping Zhu, Liya Xu, Rongjian Li, Kelou Tang, Wencheng Southeast Univ Sch Mech Engn Nanjing 210096 Jiangsu Peoples R China Nanjing Normal Univ Jiangsu Key Lab Printing Equipment & Mfg 3D Nanjing 210042 Jiangsu Peoples R China

A kind of digitally designing and manufacturing system for the gradient heterogeneous 3-D printing was designed. The molar model of PLY format was composed based on the CT images, and a novel method for the gradient heterogeneous material model designing based on the material distribution control function and the sliced edge rings was proposed. The point color slicing algorithm based on the topological structure was achieved. Based on the system, a gradient heterogeneous dental model was prepared. The algorithm used for constructing and slicing of the molar model could store the geometry and material information effectively, and maintain the compatibility for the heterogeneous 3-D printer. The system supplied a fast and integrating method for the heterogeneous 3-D bio-model printing.

关键词： 3D printing heterogeneous model CT images slicing algorithm micro-jetting

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3D model of filler melting with micro-beam plasma arc based on additive manufacturing technology

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INTERNATIONAL JOURNAL OF MODERN PHYSICS B 2017年第16-19期31卷 1744016-1744016页

作者： Chen, Weilin Yang, Tao Yang, Ruixin Southwest Jiaotong Univ Sch Mat Sci & Engn 111North 1st Sect Second Ring Rd Chengdu 610031 Sichuan Peoples R China

Additive manufacturing technology is a systematic process based on discrete accumulation principle, which is derived by the dimension of parts. Aiming at the dimension mathematical model and slicing problems in additive manufacturing process, the constitutive relations between micro-beam plasma welding parameters and the dimension of part were investigated. The slicing algorithm and slicing were also studied based on the dimension characteristics. By using the direct slicing algorithm according to the geometric characteristics of model, a hollow thin-wall spherical part was fabricated by 3D additive manufacturing technology using micro-beam plasma.

关键词： Additive manufacturing micro-beam plasma dimension mathematical model slicing algorithm

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Mit :: Lcs :: Tm :: Mit-Lcs-Tm-541

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2016年

Mit :: Lcs :: Tm :: Mit-Lcs-Tm-541 by published by

关键词： anonymity anonymous anonymous routing attacker destination destination anonymity malicious nodes mit-lcs-tm-541 node nodes onion routing public key relay node relay nodes routing sender setup latency slices slicing algorithm source source anonymity

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Automatic Choroid Layer Segmentation:A slicing Approach

Automatic Choroid Layer Segmentation:A Slicing Approach

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2016 IEEE International Conference on Progress in Informatics and Computing

作者： Chengyu Luo School of Control and Computer Engineering North China Electric Power University

Optical coherence tomography(OCT) is a powerful and noninvasive imaging technique for eye ground imaging. This method is usually used to assist glaucoma diagnosis nowadays. We propose a novel automated method for the segmentation of choroid layer in OCT image. Our approach is based on normalized cut algorithm, which aims at extracting the global impression of an image and treat image segmentation as a graph partitioning problem. However, due to the complexity of the layer structure of eye ground and choroid layer itself, we employ a series of preprocessing algorithms to make the cut more deterministic and accurate. Furthermore, to make the cutting algorithm focused on cutting in a horizontal manner instead of meaningless vertical cuts, we slice the image into small slices plumb and run the normalized cut algorithm respectively on these slices. After that, we combine them together to get a global cut on the original image. We calculate the thickness of choroid layer, which is a key factor for diagnosis. We used the thickness as the major factor to measure our performance. The mean relative error of the algorithm is about 0.04 compared with manual segmentation performed by oculists. The proposed method was tested on a database including more than eight hundred images of fifty healthy people between 20 and 50 years old.

关键词： Glaucoma Choroid layer OCT images slicing algorithm

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slicing algorithm for polyhedral models based on vertex shifting

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INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING 2010年第5期11卷 803-807页

作者： Kim, Hyung-Jung Wie, Kyung-Hoon Ahn, Sung-Hoon Choo, Heon-Seong Jun, Cha-Soo Gyeongsang Natl Univ Div Ind & Syst Engn Jinju 660701 Gyeongnam South Korea Gyeongsang Natl Univ Engn Res Inst Jinju 660701 Gyeongnam South Korea Seoul Natl Univ Inst Adv Machinery & Design Seoul 151142 South Korea Seoul Natl Univ Sch Mech & Aerosp Engn Seoul 151142 South Korea

slicing is one of the most fundamental geometric operations in Computer-Aided Design and Manufacturing (CAD/CAM). This paper presents a practical slicing algorithm that handles singular cases in a simple and robust manner by making very small movements of vertices. The direction of the shifting is based on the manufacturing methodology of either material removal or deposition as well as singularity types. We evaluated our algorithm by implementing a slicer and applying it to various polyhedral models. The test results demonstrated that the proposed algorithm performed better than conventional slicing algorithms.

关键词： slicing algorithm Polyhedral object Material removal process Material deposition process

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Improved slicing algorithm employing nearest distance method

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE 2010年第B5期224卷 745-752页

作者： Vatani, M. Barazandeh, F. Rahimi, A. R. Nezhad, A. Sanati Amir Kabir Univ Technol Dept Mech Engn Tehran Iran

Although stereo lithography (STL) file format is widely used as a de facto industry standard in rapid prototyping (RP), there are in practice always some defects and shortcomings when the slicing output file (SOF) is generated. As the model size and complexity grow, the defects grow exponentially and as a result it becomes impossible to fix the STL files manually. Modifying the head-to-tail algorithm, a new method that produces an error-free SOF (in spite of defects in the original STL file) with fewer data to analyse is presented herein. The nearest distance algorithm employed guarantees fully closed contours.

关键词： layer manufacturing stereo lithography files slicing algorithm nearest distance analysis

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Research on the rapid slicing algorithm based on STL topology construction

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International Conference on Manufacturing Science and Engineering (ICMSE 2009)

作者： Yang, Guang Liu, Weijun Wang, Wei Qin, Lanyun Chinese Acad Sci Shenyang Inst Automat Shenyang 110016 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China Shenyang Inst Aeronaut Engn Shenyang 110134 Peoples R China

ISBN: (纸本)9780878492800

Constructing the topology of STL file efficiently is a key factor to improve the efficiency of slicing algorithm. In this paper a topology construction algorithm based on Standard Template Library set containers and a rapid slicing algorithm are developed. The algorithm developed removes a large number of redundant vertices, and only calculates intersection per triangular facet with slice plane once, and attains another point of intersection directly from the adjacent relations. In addition, the algorithm can reduce the times of traversing and sorting for the triangular facets, and also the times of calculation of intersection in the slicing processes, which results in the simplification of the process of constructing the slice contour, consequently the efficiency of the slicing algorithm is improved.

关键词： STL file rapid prototyping topology construction slicing algorithm Standard Template Library

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Facet Normal Vector Based Adaptive slicing algorithm

Facet Normal Vector Based Adaptive Slicing Algorithm

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2010 2nd International Conference on Computer Engineering and Technology(2010年第二届计算机工程与技术国际会议 ICCET 2010)

作者： Huabing Wang Hongyou Bian Weijun Liu Mechanical School Huaihai Institute of Technology Lianyungang Jiangsu ProvinceRP China Advanced Equipment Research Laboratory Shenyang Institute of Automation Chinese Academy of Sciences

ISBN: (纸本)9781424463473

Layer milling with uniform layer thickness is one of the main approaches for complex surfaces roughing and semi-finishing. But uneven thick material is left near the horizontal plane in some milling experiments. And the existed slicing methods can not properly solve this problem. A new slicing algorithm based on triangular facet normal vector and facet group area threshold is given. In the new algorithm,the facet normal vector is used to locate the candidate facets near which the possible uncut regions lie. Then the candidate facets are grouped with their height values and each group area is compared with a threshold. The larger is chosen as the interested groups and their height values are recorded. At last the slicing positions are determined with the height records and the given layer thickness and computation is committed. Experiments show that the new algorithm can solve the previous problem.

关键词： slicing algorithm Triangular facet Normal vector

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