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Removing local irregularities of triangular meshes with highlight line models

science in China(Series F) 2009年第3期52卷 418-430页

作者： YONG JunHai DENG BaiLin CHENG FuHua WANG Bin WU Kun GU HeJin School of Software Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China Department of Computer Science University of Kentucky Lexington KY 40506-0046 USA Key Laboratory for Information System Security Ministry of Education of China Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China jianaxi Academy of Sciences. Nanchang 330029. China

The highlight line model is a powerful tool in assessing the quality of a surface. It increases the flexibility of an interactive design environment. In this paper, a method to generate a highlight line model on an arbitrary triangular mesh is presented. Based on the highlight line model, a technique to remove local shape irregularities of a triangular mesh is then presented. The shape modification is done by solving a minimization problem and performing an iterative procedure. The new technique improves not only the shape quality of the mesh surface, but also the shape of the highlight line model. It provides an intuitive and yet suitable method for locally optimizing the shape of a triangular mesh.

关键词： highlight lines mesh optimization shape modification model repair

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ARRAY: A non-application-related, secure,wide-area disaster recovery storage system

ARRAY: A non-application-related, secure,wide-area disaster ...

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2009 IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2009

作者： Zeng, Lingfang Feng, Dan Veeravalli, Bharadwaj Wei, Qingsong Division of Data Storage System Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage Wuhan 430074 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Department of Electrical Computer Engineering National University of Singapore Singapore 117608 Singapore Data Storage Institute Singapore 117608 Singapore

ISBN: (纸本)9780769537474

With our society more information-driven, we have begun to distribute data in wide-area storage systems. At the same time, both physical failure and logic error have made it difficult to bring the necessary recovery to bear on remote data disaster, and understanding this proceeding. We describe ARRAY, a system architecture for data disaster recovery that combines reliability, storage space, and security to improve performance for data recovery applications. The paper presents an exhaustive analysis of the design space of ARRAY systems, focusing on the trade-offs between reliability, storage space, security, and performance that ARRAY must make. We present RSRAII (Replication-based Snapshot Redundant Array of Independent Imagefiles) which is a configurable RAIDlike data erasure-coding, and also others benefits come from consolidation both erasure-coding and replication strategies. A novel algorithm is proposed to improve snapshot performance referred to as SMPDP (Snapshot based on Multi-Parallel Degree Pipeline).

关键词： Recovery

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Prediction Model for Warship Formation Electromagnetic Compatibility Analysis

Prediction Model for Warship Formation Electromagnetic Compa...

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International Conference on Information Engineering and Computer science (ICIECS)

作者： Yang Xu Dongan Song Xueqin Yi Chonghua Fang Zhiyao Ding National Key Laboratory of Science and Technology of EMC China Ship Development and Design Center Wuhan China

To make the carrier-borne electronic equipments working without interference to exert completely the efficiency of naval combat system, electromagnetic compatibility of the whole ship formation should be guaranteed. This paper describes the mathematical models that predict interference between warships assuming antenna-to-antenna coupling. The propagation loss for warship formation is analyzed detailedly using an integrated model combining both the sea effect and the atmospheric effect. Finally, the predicted results of a sample analysis in conjunction with these models and classified cull method are presented.

关键词： Predictive models Electromagnetic modeling Electromagnetic compatibility Electromagnetic analysis Atmospheric modeling Electronic equipment Electromagnetic compatibility and interference Marine vehicles Mathematical model Antennas and propagation

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Suppressing cosite interference of shipboard antennas using AIC technology

Suppressing cosite interference of shipboard antennas using ...

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2009 International Conference on Microwave technology and Computational Electromagnetics (ICMTCE 2009)

作者： Zhiyao Ding Wenwu Song Chonghua Fang Yang Xu National key Laboratory of Science and Technology on EMC China Ship Development and Design Center Wuhan China

ISBN: (纸本)9781617382567

Based on the characteristics of cosite coupling interference between transmitting and receiving antennas in a same battleship, this paper analyses the principle of interference suppression using adaptive interference cancellation (AIC) method, and describes an implementing scheme. At last, an experiment programme and some results are provided to demonstrate the effectiveness of the AIC system. Experiment results prove that an interference cancellation rate (ICR) about 40 dB can be achieved using this method.

关键词： AIC ICR adaptive interference cancellation cosite interference

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Application of computer aided tolerance analysis in product design

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Hedongli Gongcheng/Nuclear Power Engineering 2009年第SUPPL. 1期30卷 82-85页

作者： Du, Hua National Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China

This paper introduces the shortage of the traditional tolerance design method and the strongpoint of the computer aided tolerancing (CAT) method, compares the shortage and the strongpoint among the three tolerance analysis methods, which are Worst Case Analysis, Statistical Analysis and Monte-Carlo Simulation Analysis, and offers the basic courses and correlative details for CAT. As the study objects, the reactor pressure vessel, the core barrel, the hold-down barrel and the support plate are used to upbuild the tolerance simulation model, based on their 3D design models. Then the tolerance simulation analysis has been conducted and the scheme of the tolerance distribution is optimized based on the analysis results.

关键词： Product design

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A Structural Health Monitoring system Using Wireless Sensor Network

A Structural Health Monitoring System Using Wireless Sensor ...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Jianjun Niu Zhidong Deng Fengguang Zhou Zongsheng Cao Zhanqing Liu Fangzhou Zhu State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory of Information Science and Technology Department of Computer Science and Technology Tsinghua University China Beijing Special Engineering Design and Research Institute China

Wireless sensor network (WSN) based structural health monitoring (SHM) system attracts increasing interest in recent years. However, the restricted bandwidth, memory and energy pose great challenges to the application of SHM in large scale building. Supported by a real engineering project, a WSN based prototype of SHM system is designed in this paper. Acceleration data, synchronously sampled in each sensor node, are transported to a data processing computer through a base station. In order to achieve a high network throughput, a time division multiple access (TDMA) approach is proposed to reduce the packet collision and energy consumption. 17 sensor nodes, one base station and a processing computer are distributed to validate the prototype system. Test results present that the approach, we proposed, can reduce the signal collision and increase data throughput. The prototype is feasible to the SHM project of a large scale building.

关键词： Monitoring Wireless sensor networks Prototypes Large-scale systems Base stations Throughput Time division multiple access Bandwidth Application software Buildings

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Conflict driven scan chain configuration for high transition fault coverage and low test power

Conflict driven scan chain configuration for high transition...

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Asia and South Pacific design Automation Conference

作者： Zhen Chen Boxue Yin Dong Xiang Department of Computer Science and Technology Tsinghua University Beijing China School of software Key Laboratory of Information System Security Ministry of Education Tsinghua National Laboratory of Information Science and Technology Tsinghua University Beijing China School of software Key Laboratory of Information System Security Ministry of Education Tsinghua National Laboratory of Information Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9781424427482

Two conflict-driven schemes and a new scan architecture based on them are presented to improve fault coverage of transition fault. They make full use of the advantages of broadside, skewed-load and enhanced scan testing, and eliminate the disadvantages of them, such as low coverage, fast global scan enable signal and hardware overhead. Test power is also a challenge for delay testing, so our method tries to reduce the test power at the same time. By the analysis of the functional dependency between test vectors in broadside testing and the shift dependency between vectors in the skewed-load testing, some scan cells are selected to operate in the enhanced scan and skewed-load scan mode, while others operate in traditional broadside mode. In the architecture, scan cells with common successors are divided into one chain. With the efficient conflict driven selection methods and partition of scan cells, fault coverage can be improved greatly and test power can be reduced, without sacrificing the test time and test data. Experimental results show that the fault coverage of the proposed method can reach the level of enhanced scan design.

关键词： Circuit faults Circuit testing Delay Automatic test pattern generation Educational technology Laboratories Fault detection Switches Multiplexing Software testing

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Roundness error evaluation based on polar mesh searching algorithm

Roundness error evaluation based on polar mesh searching alg...

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IEEE International Conference on Mechatronics and Automation

作者： Xianqing Lei Jishun Li Yujun Xue Mingde Duan Wei Ma School of Mechantronics Engineering Henan University of Science and Technology Luoyang Henan China Modern Mechanical Design and Transmission System Henan Key of Laboratory Luoyang Henan China

A new method for evaluating roundness error using polar measurement data, which named as polar mesh searching algorithm (PMSA), has been presented in this paper. The principle of the algorithm was that series of polar-coordinate mesh points were collocated around the periphery of the least square circle according to certain rule, the radius of all the measured points were calculated by regarding each mesh point as the ideal center, and the roundness error from minimum circumscribed circle method, maximum inscribed circle method and minimum zone circle method were achieved accurately through comparing these radius. In the paper, the process and steps using the PMSA to solve the roundness error were described in detail and the mathematical formula and program flowchart were given. The simulation and experiment results show that roundness error can be evaluated effectually and accurately by this algorithm.

关键词： Least squares methods Flowcharts

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Solid texture synthesis using Position Histogram Matching

Solid texture synthesis using Position Histogram Matching

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IEEE International Conference on Computer-Aided design and Computer Graphics

作者： Jiating Chen Bin Wang Department of Computer Science and Technology Tsinghua University Beijing China Ministry of Education Key Laboratory of Information System Security Beijing China School of Software Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China

In the past, several approaches have been proposed to produce high quality solid textures. Unfortunately, they often suffer from several synthesis artifacts, such as color blurry, bad texture structures, introducing aberrant voxel colors and so on. In this paper, we present a novel algorithm for synthesizing high quality solid textures from 2D exemplars. We adopt an optimization framework with the k-coherence search and the discrete solver for solid texture synthesis. The texture optimization approach is integrated with a new kind of histogram matching, position histogram matching, which effectively causes the global statistics of the synthesized solid textures to match those of the exemplars. Experimental results show that our synthesized results do not suffer from color blurry, and most texture structures are preserved well, outperforming the previous solid texture synthesis algorithms in terms of the synthesis quality.

关键词： Histograms Solid modeling Surface texture Educational technology Laboratories Principal component analysis Software quality Computer science Information systems Computer security

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ARRAY: A Non-application-Related, Secure, Wide-Area Disaster Recovery Storage system

ARRAY: A Non-application-Related, Secure, Wide-Area Disaster...

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International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Lingfang Zeng Dan Feng Bharadwaj Veeravalli Qingsong Wei Division of Data Storage System Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage Ministry of Education School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical and Computer Engineering National University of Singapore Singapore Data Storage Institute Singapore

With our society more information-driven, we have begun to distribute data in wide-area storage systems. At the same time, both physical failure and logic error have made it difficult to bring the necessary recovery to bear on remote data disaster, and understanding this proceeding. We describe ARRAY, a system architecture for data disaster recovery that combines reliability, storage space, and security to improve performance for data recovery applications. The paper presents an exhaustive analysis of the design space of ARRAY systems, focusing on the trade-offs between reliability, storage space, security, and performance that ARRAY must make. We present RSRAII (Replication-based Snapshot Redundant Array of Independent Imagefiles) which is a configurable RAID-like data erasure-coding, and also others benefits come from consolidation both erasure-coding and replication strategies. A novel algorithm is proposed to improve snapshot performance referred to as SMPDP (Snapshot based on Multi-Parallel Degree Pipeline).

关键词： Secure storage Network servers Bandwidth Redundancy Data security Cities and towns Laboratories Educational technology Hardware History

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