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Towards additive manufacturing oriented geometric modeling using implicit functions

Visual Computing for Industry,Biomedicine,and Art 2018年第1期1卷 95-110页

作者： Qingde Li Qingqi Hong Quan Qi Xinhui Ma Xie Han Jie Tian School of Engineering and Computer Science University of HullHull HU67RXUK Software School Xiamen UniversityXiamenChina School of Computer Science and Control Engineering North University of ChinaTaiyuanChina Intelligent Bioinformatics Systems Division Institute of AutomationThe Chinese Academy of SciencesBeijingChina

Surface-based geometric modeling has many advantages in terms of visualization and traditional subtractive manufacturing using computer-numerical-control cutting-machine ***,it is not an ideal solution for additive manufacturing because to digitally print a surface-represented geometric object using a certain additive manufacturing technology,the object has to be converted into a solid ***,converting a known surface-based geometric representation into a printable representation is essentially a redesign process,and this is especially the case,when its interior material structure needs to be *** specify a 3D geometric object that is ready to be digitally manufactured,its representation has to be in a certain volumetric *** this research,we show how some of the difficulties experienced in additive manufacturing can be easily solved by using implicitly represented geometric *** surface-based geometric representation is subtractive manufacturing-friendly,implicitly described geometric objects are additive manufacturing-friendly:implicit shapes are 3D printing *** implicit geometric representation allows to combine a geometric shape,material colors,an interior material structure,and other required attributes in one single description as a set of implicit functions,and no conversion is *** addition,as implicit objects are typically specified procedurally,very little data is used in their specifications,which makes them particularly useful for design and visualization with modern cloud-based mobile devices,which usually do not have very big storage ***,implicit modeling is a design procedure that is parallel computing-friendly,as the design of a complex geometric object can be divided into a set of simple shape-designing tasks,owing to the availability of shape-preserving implicit blending operations.

关键词： Additive manufacturing 3D printing-friendly CAD Implicit function Isosurface Level-set Function-based shape modeling Implicit modeling

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A modelica coordination pattern library for cyber-physical systems 14

A modelica coordination pattern library for cyber-physical s...

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7th International Conference on Simulation Tools and Techniques, SIMUTools 2014

作者： Pohlmann, Uwe Dziwok, Stefan Meyer, Matthias Tichy, Matthias Thiele, Sebastian Fraunhofer IPT Project Group Mechatronic Systems Design Software Engineering Zukunftsmeile 1 Paderborn33102 Germany Software Engineering Group Heinz Nixdorf Institute University of Paderborn Zukunftsmeile 1 Paderborn33102 Germany Software Engineering Division Department of Computer Science and Engineering Chalmers University of Gothenburg Sweden

ISBN: (纸本)9781631900075

Today's embedded systems often do not operate individually anymore. Instead, they form so called cyber-physical systems, where the overall functionality is provided by the collaboration of systems. Consequently, the design of this collaboration is an important activity during development and strongly affects system quality. In previous work, we presented a catalog of reusable messagebased real-time coordination patterns to avoid manual creation of new and, thus, error-prone designs. In this paper, we present an implementation of this catalog by a library in the Modelica language and an appropriate development process. The library stores ready to reuse solutions for common coordination activities and, thus, increases efficiency and effectiveness for use. Furthermore, the use of Modelica enables early holistic simulation of cyber-physical systems including feedback controllers and message-based coordination. We illustrate the library with examples from an autonomous railway vehicle and present an early evaluation. Copyright © 2014 ICST.

关键词： Cyber Physical System

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Super monitoring system of the reaction kettle in the chemical process

Super monitoring system of the reaction kettle in the chemic...

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International Conference on Control, Automation and Systems engineering

作者： Wang, Jiaxin Yang, Lianhe Ma, Ming Gao, Hongle School of Computer Science and Software Engineering Tianjin Polytechnic University Tianjin China Science and Technology Division Tianjin Polytechnic University Tianjin China

ISBN: (纸本)9781457708602

The paper introduces the design of the super monitoring system of the reaction kettle, the serial communication between the super computer and the multichannel distributional lower computer, as well as the design of monitoring surface which has been realized using VB. The system has the powerful data-handling capacity and the image display ability, and may carry on the control through the data transfer to the lower computer. The system has achieved the real-time monitor of the production process of the reaction kettle conveniently. © 2011 IEEE.

关键词： Monitoring

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Rescue-model: A multi-agent simulation of bushfire disaster management

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4th Robot World Cup Soccer Games and Conferences, RoboCup 2000

作者： Au, Gary Goss, Simon Heinze, Clint Pearce, Adrian R. Air Operations Division Defence Science and Technology Organisation Melbourne Australia Department of Software Engineering and Computer Science University of Melbourne Melbourne Australia

ISBN: (纸本)3540421858

The RescueModel project is a vehicle for research into multi-agent systems, architectures, and strategies. It builds on the theoretical, practical, and experimental base of a decade of beliefs-desires-intentions (BDI) agent systems development. This paper describes a project that will bring together the environmental richness found usually in large scale military operations research simulations with the architectural richness of agent models often researched in universities. Proposed applications of RescueModel include search and rescue and disaster response studies. © 2001 Springer-Verlag Berlin Heidelberg.

关键词： Multi agent systems

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Detailed multi canister release model of radionuclides in high level radioactive waste repository using wavelet Galerkin method

Detailed multi canister release model of radionuclides in hi...

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10th International Conference on Nuclear engineering (ICONE 10)

作者： Nasif, Hesham R. Neyama, Atsushi Environmental Engineering Division Computer Software Development Co. 15-1 Tomihisa-Cho Shinjuku-Ku Tokyo 162-0072 Japan

ISBN: (纸本)9784888982566

This work develops a model to calculate the radionuclides release from a repository for high level radioactive waste, taking into account multiple-canister interface. Once the overpack loses its integrity, the waste glass starts to dissolve by porewater in the bentonite buffer. Bentonite is expected to have hydraulic conductivity more than three orders of magnitude less than that of the surrounding rocks. The migrating nuclide from the buffer region is transported in the near field granite host rock, then releases to the far field of the repository. A mass concentration calculation in the far field of the repository is also included in the model. The model is diffusion-advection model. The model is solved using wavelet Galerkin method (WGM). The model is devised to be fast and compact due to the compactly supported property of the Daubechies' wavelet. Since the scaling functions are compactly supported only a finite number of the connection coefficients are nonzero. The resultant matrix has block diagonal structure, which can be inverted easily. We tested our model for a try of canisters contains 200 canisters. The results show well agreements with the results obtained from the analytic solution with a proper selection of wavelet-dilation order pairs.

关键词： Radioisotopes

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Experimental analysis of non-rollbackable pseudo random number in optimistic parallel simulation

Experimental analysis of non-rollbackable pseudo random numb...

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2012 International Conference on Information Technology and software engineering, ITSE 2012

作者： Wang, Bing Deng, Bo Chen, Lili Xing, Fei Yao, Yiping Software Division Beijing Institute of Systems Engineering 100101 Beijing China School of Computer National University of Defense Technology 410073 Changsha China

ISBN: (纸本)9783642345210

Pseudo-Random Number Generator (PRNG) fulfills the need to generate random variables in discrete event simulation. Particularly, the quality of Pseudo-Random Numbers (PRNs) not only has great impact on the performance, but also directly impacts the correctness of the Parallel Discrete-Event Simulation (PDES). In this paper, experiments have been conducted to study the influence to the quality of random number sequences brought by optimistic parallel simulation. From the preliminary results, we have found out that the random number sequence generated by non-rollbackable PRNG in optimistic parallel simulation passed the uniformity test, but failed in the independence test. © 2013 Springer-Verlag.

关键词： Discrete event simulation

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POSTER: High Performance GPU Concurrent B+tree 27

POSTER: High Performance GPU Concurrent B+tree

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27th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming, PPoPP 2022

作者： Zhang, Weihua Zhao, Chuanlei Peng, Lu Lin, Yuzhe Zhang, Fengzhe Jiang, Jinhu Software School Fudan University Shanghai China Division of Electrical and Computer Engineering Louisiana State University Baton RougeLA United States

ISBN: (纸本)9781450392044

Concurrent B+trees have been widely used in many systems from file systems to databases. With the volume of data requests expanding exponentially, the systems are facing tremendous performance pressure. GPUs have shown their potential to accelerate the concurrent B+trees operations with their high volume of parallel computing resources and large memory bandwidth. In concurrent B+tree, the conflicts should be detected and resolved when multiple concurrent requests are traversing and operating on the tree. However, conflict detection and handling in concurrent B+tree complicates the request processing logic, increases the number of memory accesses and leads to execution path divergence. That leads to performance degradation and increased response time variance. We present a high performance GPU concurrent B+tree. To reduce the performance impact introduced by conflict detection, an optimization is proposed to detect and resolve key conflicts before concurrent requests are issued to the execution phase. Then another optimization is used to reduce structure conflicts and concurrent control overheads. Finally, an optimization is used to reduce structure conflicts and improve memory performance by exploiting the locality among requests. Evaluations on a TITAN V GPU show that our GPU concurrent B+tree is efficient with a throughput of 1.23 billion per second. Compared to a state-of-the-art GPU B+tree system, it can achieve 5.1X speedup and reduce the response time variance from 38% to 4%. © 2022 Owner/Author.

关键词： Graphics processing unit

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Deep Learning-Based Action Classification Using One-Shot Object Detection

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computers, Materials & Continua 2023年第8期76卷 1343-1359页

作者： Hyun Yoo Seo-El Lee Kyungyong Chung Contents Convergence Software Research Institute Kyonggi UniversitySuwon-si16227Korea Department of Public Safety Bigdata Kyonggi UniversitySuwon-si16227Korea Division of Computer Science and Engineering Kyonggi UniversitySuwon-si16227Korea

Deep learning-based action classification technology has been applied to various fields,such as social safety,medical services,and *** an action on a practical level requires tracking multiple human bodies in an image in real-time and simultaneously classifying their *** are various related studies on the real-time classification of actions in an ***,existing deep learning-based action classification models have prolonged response speeds,so there is a limit to real-time *** addition,it has low accuracy of action of each object ifmultiple objects appear in the ***,it needs to be improved since it has a memory overhead in processing image *** learning-based action classification using one-shot object detection is proposed to overcome the limitations of multiframe-based analysis *** proposed method uses a one-shot object detection model and a multi-object tracking algorithm to detect and track multiple objects in the ***,a deep learning-based pattern classification model is used to classify the body action of the object in the image by reducing the data for each object to an action *** to the existing studies,the constructed model shows higher accuracy of 74.95%,and in terms of speed,it offered better performance than the current studies at 0.234 s per *** proposed model makes it possible to classify some actions only through action vector learning without additional image learning because of the vector learning feature of the posterior neural ***,it is expected to contribute significantly to commercializing realistic streaming data analysis technologies,such as CCTV.

关键词： Human action classification artificial intelligence deep neural network pattern analysis video analysis

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Recognition and Diagnosis of Computed Tomography Images Using Reconstructive Techniques 10th

Recognition and Diagnosis of Computed Tomography Images Usin...

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10th International Conference on Frontier Computing, FC 2020

作者： Li, Pengzhi Li, Jianqiang Xie, Haihua Pei, Yan Feng, Hui School of Software Engineering Beijing University of Technology Beijing100124 China Computer Science Division University of Aizu Aizuwakamatsu965-8580 Japan

ISBN: (纸本)9789811601149

In this paper, we propose a diagnosis and classification method of colonography CT Images based on deep learning and image reconstruction, which is processed to increase the difference between pathological features and other healthy tissues and improve the accuracy of pathological images classification. It is difficult to accurately distinguish polyps features owing to the variability of appearances, fuzzy boundaries, heterogeneous densities, shapes and sizes of lesions. Some study results show that the ResNet network has a better performance than other methods and has broad application prospects in the identification of CT images. We used the improved ResNet network as the classification model. We completed the classification experiment on the colonography datasets. Through comparative experiments, we found gradient features play an important role in the classification of colonography CT images. More unexpectedly, for CT images of colonography, the classification effect of CT images with small information entropy is excellent. A new "RGB" image containing two channels of gradient features and one channel of LBP features is very effective for classification, which may be a new attempt. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Image reconstruction

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Designing perception modules to shape information for agents 1

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6th Pacific Rim International Conference on Artificial Intelligence, PRICAI 2000

作者： Heinze, Clint Pearce, Adrian Sterling, Leon Goss, Simon Department of Software Engineering and Computer Science University of Melbourne Melbourne Australia Air Operations Division Defence Science and Technology Organisation Melbourne Australia

ISBN: (数字)9783540454083

ISBN: (纸本)3540425977

The difficulty associated with placing intelligent agents in environments is in part one of designing the means by which they sense their world. If the world is complex, or if the information available in the world is in an inappropriate form, then a mismatch between the information in the environment and the information required by the agent can exist. Practical means of dealing with this mismatch are available but designing the system requires careful modelling. By modelling perception as the module within the agent responsible for sensing and making sense of the environment several advantages are realised. The explicit representation of perception allows consideration of the issues, affords software engineering advantages with respect to the specification and design of systems and is compatible with many accepted definitions of agency. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Intelligent agents

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