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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Hao, Senshen Jiao, Jian Xia, Chunhe Li, Xiaojian Yao, Shan State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China Beijing Key Laboratory of Network Technology School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781424480340

In order to effectively deal with large-scale attacks on computer networks, computer Network Defense (CND) policy refinement based on descriptive language is wildly used. However, it's very difficult to figure out the semantic discrepancies between the measures and the predefined policy after the calculation with symbols by computers. A new method is presented to solve the discordance of semantic between the measures and the predefined policy automatically. Based on the establishment of the ontology of CND policy and measure (CNDPM), the CND policy and measure semantic similarity analysis model (CNDPMSSAM) is established, and then the termination of the two main components of CNDPMSSAM are proofed by the putdown automaton, and the prototype system of CNDPMSSAM is implemented. At last, we validate the validity of this method on analyzing semantic similarity of transferring from computer Network Defense Policy Specification Language (CNDPSL) to Defense Measure Description Language (DMDL) with experiments. © 2010 IEEE.

关键词： Ontology

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Constructing digital museum grid for science popularization exhibition

Constructing digital museum grid for science popularization ...

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International Conference on Audio, Language and Image Processing

作者： Liu, Yi-Li Chen, Xiao-Wu Zhou, Bin Luo, Xi-Xi State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781424458653

The exhibition of China Science and technology Museum needs to exhibit the specimens of the digital museums and demonstrate the grid technology in a vivid way which meets the requirements from visualization, interaction and multimedia. This paper designs a method of constructing digital museum grid for the purpose of science popularization, based on the existing work of China Education and Research Grid. The method presented here is composed of three steps. Firstly, the human-computer interface and interaction for the science popularization exhibition is designed. Then a way of sharing digital specimen resources is given. Finally, we establish the digital museum grid system for science popularization in the grid environment. The status shows that the exhibition is working very well in China Science and technology Museum, and has received recognition from users. ©2010 IEEE.

关键词： Exhibitions

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Descriptive model of peer-to-peer botnet structures

Descriptive model of peer-to-peer botnet structures

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Duan, Junfeng Jiao, Jian Xia, Chunhe Yao, Shan Li, Xiaojian State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China Beijing Key Laboratory of Network Technology School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781424480340

Peer-to-peer (P2P) Botnets, which are more resilient and robust than centralized botnets, have emerged as the peer-to-peer technology evolves. Better understanding of this new phenomenon will help researchers develop detection and mitigation methods. Most of existing work is case study of typical P2P botnets. In this paper, we focus on systematically analyzing structures of P2P botnets. We propose a descriptive model of P2P botnet structures, which consists of features of P2P bot, definitions of structures, and structural properties. Firstly, we detail two key functionalities of P2P bot, command-and-control (C&C) functionality and peer-to-peer (P2P) functionality, and give several features of P2P bot. And then, we define two structures of P2P botnets: C&C structure and P2P structure. To characterize these structures, we propose several properties and corresponding quantitative methods. Finally, we conduct experiments to verify our results. © 2010 IEEE.

关键词： Structural properties

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Accelerate Smoothed Particle Hydrodynamics using GPU

Accelerate Smoothed Particle Hydrodynamics using GPU

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2010 IEEE Youth Conference on Information, Computing and Telecommunications, YC-ICT 2010

作者： Gao, Xiaopeng Wang, Zhiqiang Wan, Han Long, Xiang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University 100191 Beijing China

ISBN: (纸本)9781424488841

Physic-based fluid simulation is used extensively nowadays;however the traditional serial algorithm can't satisfy the realtime requirement due to its complexity and compute-intensive. The development of modern GPU makes this possible. In this paper, a Smoothed Particle Hydrodynamics (SPH) method for incompressible fluid was implemented using CUDA on GPU. Since the algorithm was executed on the GPU entirely, the method can take full advantage of massive computational power of modern graphics hardware. The experiment results show that our GPU based SPH implementation can achieve the rate of 89 frames per second in the simulation of 102K particles and gain nearly 140x speedups compared with the serial algorithm. © 2010 IEEE.

关键词： Graphics processing unit

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Simplification for texture mapping models with mesh segmentation

Simplification for texture mapping models with mesh segmenta...

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2010 16th International Conference on virtual Systems and Multimedia, VSMM 2010

作者： Wang, Lili Ma, Zhiqiang Xue, Bing Shen, Zhe State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781424490264

To reduce the loss of visual details in simplification for textured meshes, this paper presents a simplification method based on mesh segmentation. Firstly, the model is partitioned into some sub-meshes according to their properties of appearance, such as texture, normal, etc. Thus, the correlation between sub-meshes can be decreased. Then, we calculate the error metric for the edge collapse in each sub-mesh. Lastly, we merge the simplified sub-meshes and fix the gap among them to regain an integrated mesh. Because the properties of appearance are used to separate the high-frequency details from low-frequency ones, our approach decreases the loss of the detailed. Therefore, we can not only keep the over whole contours of the model, but also maintain better geometric and appearance details. The results of experiments demonstrate our mesh segmentation based method is effective. ©2010 IEEE.

关键词： Mesh generation

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Integration of 3D registration methods based on multiple natural features

Integration of 3D registration methods based on multiple nat...

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International Conference on Audio, Language and Image Processing

作者： Chen, Meng-Meng Chen, Xiao-Wu Liu, Yi-Li State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781424458653

Current markerless 3D registration methods usually utilize a single specified category of natural features. However, the richness of various natural features is ignored. They cannot meet users' diversified registration requirements. This article proposes an integration strategy of 3D registration methods based on multiple natural features. Utilizing feature detection and tracking and 3D registration algorithms, taking feature points, rectangle features, natural markers and hand features as four typical natural features, we design a description method of multiple natural features state space. With user interaction, the 3D registration is completed through detecting and tracking corresponding natural features. Experiments demonstrate the applicability and accuracy of the proposed integration strategy of 3D registration methods. ©2010 IEEE.

关键词： Integration

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Image retargeting based on delaunay triangle mesh

Image retargeting based on delaunay triangle mesh

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作者： Chen, Zhigao Li, Wei Li, Xiaoyan Li, Tianran Akram, Naveed State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineer Beihang University Beijing China

ISBN: (纸本)9788988678312

Accurate presentation of high resolution images on wide varieties of multimedia devices, especially on pervasive mobile multimedia devices, faces great challenge. In this paper, we present an angle preserved warping method for image retargeting which allows resizing images to arbitrary aspect ratios while minimizing the loss of important information. To accomplish this, we first cover the original image with a Delaunay triangle mesh based on saliency map of the image, which is computed by considering the lumination, color, gradient and position features of the pixels comprehensively;and then the triangle mesh is deformed to target aspect ratios subject to a deformation loss function, to drive the visual prominent features to undergo similarity transformations. The deformation loss function is constrained by the angle's changes of the triangles in the triangle mesh. Compared with previous approaches using grid mesh, our method can transfer the distortion caused by the change of the image aspect ratios to less saliency regions much more effectively.

关键词： Aspect ratio

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HPSIN: a new hybrid P2P spatial indexing network

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The Journal of China Universities of Posts and Telecommunications 2010年第3期17卷 66-72页

作者： WU Jia-gao JIANG Nan ZOU Zhi-qiang HU Bin HUANG Lin FENG Jia-li Institute of Computer Technology Nanjing University of Posts & Telecommunications Nanjing 210003 China Key Laboratory of Virtual Geographic Environment Ministry of Education Nanjing Normal University Nanjing 210046 China School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210093 China

Geographic information system （GIS） is increasingly managing very large sets of data, hence a centralized data index may not always provide the most scalable solution. Recently, the peer to peer （P2P） networks have become very popular for sharing information in a totally decentralized manner. In this paper, a new hybrid P2P spatial indexing network （HPSIN） is proposed, which combines distributed quad-tree with distributed Hash table （DHT） based Chord network to maintain both query efficiency and system load balance. In addition, a simple theoretical model based on opened queueing network for HPSIN is established. Assuming each peer as M/M/1 queueing processor in the model, fundamental characteristics of the system is captured, and expression of average query delay is obtained in close form. The theoretical analysis and numerical computing results show that there exists an optimum point of tradeoff between efficiency and load balance. By setting a proper value of start index level ls for different network scale and query rate, HPSIN will achieve the minimum overall query delay, therefore, can adapt to different P2P application environments.

关键词： GIS P2P networks spatial indexing queueing network theory

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A hybrid deformation model for virtual cutting

A hybrid deformation model for virtual cutting

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IEEE Internaitonal Conference on Multimedia Information Processing and Retrieval

作者： Shao, Xuqiang Zhou, Zhong Wu, Wei State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769542171

In this paper, we present a novel hybrid deformation model, which can simulate large deformations and non-linear behaviors of soft tissues in real time. The model partitions a soft tissue into operational and non-operational regions, and simulates the large deformations by coupling the geometry constrained meshless method FLSM (fast lattice shape matching) with finite element algorithm TLED (total Lagrangian explicit dynamics). With the virtual node cutting method, the soft tissues can be cut realistically and robustly. The virtual cutting simulation features real time performance with the GPU-based acceleration. In combination with our multi-camera based real-time modeling framework, the deformable model and its interaction of virtual cutting can be extended to support remote virtual surgery. © 2010 IEEE.

关键词： Finite element method

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Static object tracking in road panoramic videos

Static object tracking in road panoramic videos

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IEEE Internaitonal Conference on Multimedia Information Processing and Retrieval

作者： Zhou, Zhong Niu, Ben Ke, Chen Wu, Wei State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769542171

In panoramic videos, the object movement between adjacent side images leads to deformation and discontinuity, which makes the traditional video tracking approaches insufficient. An effective static object tracking algorithm is proposed in this paper to resolve the tracking problems from the deformation and discontinuity in cubic panorama. The algorithm extends the relevant side images with boundary consistency, and then conducts a background eliminated mean-shift algorithm to track objects on the extended images. Experiment results show that the algorithm can track static objects correctly in reasonable situations in real-time. © 2010 IEEE.

关键词： Deformation

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