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检索条件"机构=State Key Lab of Virtual Reality Technology and System"

共 344 条记录，以下是291-300 订阅

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Hydraulic Flow Simulation on Dynamical Changing Terrain

Hydraulic Flow Simulation on Dynamical Changing Terrain

引用

International Conference on Computational and Information Sciences (ICCIS)

作者： Aimin Hao Shiwu Zhu Shuai Li State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

Water simulation and terrain change are both important aspects in computer graphics and useful in producing realistic interactive environment. We present a step to combine the two phenomena together. In our system terrain is carefully organized to make it can be modified easily. The water flow is calculated by the shallow water simulation, which is a 2D simplification of Navier-Stocks equations. When the terrain is changed by external force, the stream's original path may be broken or form new branches, meanwhile the water flows through the new path accordingly. We design the method skillfully to make it suits the GPU's multi-kernel architecture, so can take full advantage of the parallelism of current powerful graphics hardware. Our experiments demonstrate that the proposed method is suitable for real-time simulation of a variety of scenes including tracks on wetland, river diversion, adding obstacles into the water, etc.

关键词： Mathematical model Computational modeling Adaptation model Solid modeling Fluids Equations Graphics processing unit

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Region Adaptive Inter-Color Prediction Approach to RGB 4:4:4 Intra Coding

Region Adaptive Inter-Color Prediction Approach to RGB 4:4:4...

引用

Pacific-Rim Symposium on Image and Video technology (PSIVT)

作者： Lili Zhao Mingjing Ai State Key Laboratory of Virtual Reality System and Technology Beihang University Beijing China

RGB color signals encoding is more desirable for high resolution and accurate definition for saturations and hue. This paper presents a region adaptive inter-color prediction scheme for 4:4:4 RGB signals, which treats G component as a primary component and predicts B/R component from G component with different weighting factors based on different texture regions. The proposed algorithm demonstrates more efficient coding performance both than the H.264/AVC intra coding algorithm and than the block adaptive prediction algorithm. Experimental results show that, compared with the H.264/AVC intra coding algorithm, the proposed algorithm can produce a bit-rate saving of up to 26-30% with PSNR gain of 0.3-0.5dB for some high resolution video sequences and low resolution static images. Meanwhile, the complexity of the proposed algorithm is much less than that of H.264/AVC intra prediction technique in independent mode.

关键词： Prediction algorithms Encoding Algorithm design and analysis Automatic voltage control Image coding Image color analysis Pixel

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ACRP: Ant-colony-based routing protocol for DTMNs

ACRP: Ant-colony-based routing protocol for DTMNs

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Zhang, Pengxiu Wang, Haiquan Xia, Chunhe Lv, Liangshuang Liu, Xiaodong State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Beijing Key Laboratory of Network Technology Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China School of Software Beihang University Beijing China

ISBN: (纸本)9781424480340

Delay Tolerant Mobile Networks (DTMNs) focus on scenarios where most of the time contemporaneous end-to-end paths between source and destination do not exist, and mobility should be explored for message delivery. Ant colony optimization is based on reinforcement learning and is adaptive. In this paper, we propose ACRP: an Ant-Colony-based Routing Protocol for DTMNs. In the protocol, the forward ants and backward ants establish the pheromone trail;the data ants make forwarding decision according to the probability function composing both the pheromone and the heuristic information. We present simulation results measuring the performance of ACRP and compare it with other well-known routing protocols. © 2010 IEEE.

关键词： Routing protocols

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TLDV: Tree-Like Locator Distance Vector routing protocol for MANETs

TLDV: Tree-Like Locator Distance Vector routing protocol for...

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Wang, Haiquan Mi, Le Xia, Chunhe Lv, Liangshuang Chen, Meng State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Beijing Key Laboratory of Network Technology Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China School of Software Beihang University Beijing China

ISBN: (纸本)9781424480340

Most routing protocols in MANETs don't scale well in networks with large numbers of nodes where the scalability of the routing protocols plays a vital role. And it is well known that these routing protocols usually use node locator (e.g. IP address) as pure identifier. In this paper, we propose a scalable Tree-Like Locator Distance Vector routing protocol for MANETs, which is inspired by DART. This protocol splits node's ID and locator in network layer. Each node has one unique permanent ID and a temporary dynamic 2b-ary tree locator. Node's locator describes the node's relative position in the network's topology, and should change whenever the topology changes. © 2010 IEEE.

关键词： Routing protocols

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Simplification for texture mapping models with mesh segmentation

Simplification for texture mapping models with mesh segmenta...

引用

International Conference on virtual systems and MultiMedia

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

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.

关键词： Mathematical model Measurement Equations Solid modeling Image edge detection Visualization Adaptation model

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ACCELERATE SMOOTHED PARTICLE HYDRODYNAMICS USING GPU

ACCELERATE SMOOTHED PARTICLE HYDRODYNAMICS USING GPU

引用

2010 IEEE Youth Conference on Information,Computing and Telecommunications(2010 IEEE青年信息、计算和通信技术大会)

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

Physic-based fluid simulation is used extensively nowadays;however the traditional serial algorithm can’t satisfy the realtime requirement due to its complexity and computeintensive. 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.

关键词： CUDA fluid simulation Smoothed Particle Hydrodynamics GPU acceleration

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引用

International Conference on Educational and Information technology (ICEIT)

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

ISBN: (纸本)9781424480333

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.

关键词： CND measure CND policy ontology semantic similarity Ontology Semantics Policies ANALYSIS MODELS Discordance Signs and symbols

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Descriptive model of peer-to-peer Botnet structures

Descriptive model of peer-to-peer Botnet structures

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International Conference on Educational and Information technology (ICEIT)

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

ISBN: (纸本)9781424480333

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.

关键词： Peer to peer computing Routing protocols Concrete Storms Analytical models Fires

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Geodesic Model of Human Body

Geodesic Model of Human Body

引用

International Conference on Cyberworlds

作者： Weihe Wu Aimin Hao Yongtao Zhao School of Art & Design Beijing University of Technology Beijing China State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

Anthropometry is widely applied to the research in skeleton extraction from surface meshes of human body. Especially the anatomical proportion can be employed as a benchmark in model segmentation and joint extraction. Unfortunately, the anatomical proportion is usually measured with the Euclidean distance, which makes it difficult to correlate it with the surface mesh. To bridge this gap, we take advantage of the property of the geodesic metrics that is invariance to rotation, translation, scaling and model pose, and propose an original geodesic model in which the length of each part of human body is measured by geodesic metrics, by which the anatomic proportions can be directly mapped to the contours of the mesh surface of human body in arbitrary pose. Combining the geodesic model with automatic extraction of feature points, we can determine the candidate scopes of joint positions and boundaries between the parts on meshes, and then refine the joint positions in the scopes using existing methods. And finally, we illustrate the utility of the geodesic model with an application to joint extraction.

关键词： Joints Feature extraction Biological system modeling Computational modeling Level measurement Shape

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GPU-BASED TIME PARALLEL CACHE SIMULATOR

GPU-BASED TIME PARALLEL CACHE SIMULATOR

引用

2010 IEEE Youth Conference on Information,Computing and Telecommunications(2010 IEEE青年信息、计算和通信技术大会)

作者： Junjie Ma Han Wan Xiaopeng Gao Xiang Long State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Xueyuan Rd.37 100191 Beijing China

We present the design of time parallel trace-driven cache simulation for the purpose of evaluating different cache architectures. Due to the long simulation cycles, traditional sequential simulation methods are no longer practical. An obvious way to achieve fast parallel simulation is time parallel. It splits the whole trace into small slices which are assigned to parallel processors for concurrent simulation. In this paper, we introduce a novel time parallel multiconfiguration simulation on single pass method. It exploits time partitioning as the main sources of parallelism and takes the full advantage of the computational capability offered by the Compute Unified Device Architecture (CUDA) on the GPU. Our experimental results demonstrate that the cache simulator based on GPU platform gains 1.91x performance improvement compared to traditional serial algorithm.

关键词： cache simulation trace-driven simulation time partitioning GPU CUDA

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