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International Conference on computer and Information technology (CIT)

作者： Xianqin Chen Xiang Long Xiaopeng Gao Junjie Ma State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Technology Beijing Aeronautics and Astronautics University Beijing China

With the rapid advance of computer and network technology, more and more applications are deployed in the customer-side network. These applications require different quality of service (QoS), but have to share a few bandwidth limited Internet connections. Owing to the IP network's best-effort delivery mechanism, the QoS requirements are hard to be satisfied. There have been plenty of QoS solutions in research and industry areas, however, few of them are easy to understand or to deploy. Therefore, we provide a solution, based on a simple and clear model, has the ability of transparently deployed at the inner side of customer's gateway device and controlled in the application-oriented way. We also introduce a straightforward QoS policy definition language to allow user to create QoS rules for various applications. We conduct the evaluation of our prototype system running upon mid-end industrial personal computer under both the lab.test-bed and the practical network. In the lab.test, our system achieves 200Mbps throughput, in the practical field test, our system successfully manages a 100Mbps Internet link for over 3000 active users.

关键词： Bandwidth Quality of service Application software system testing computer networks Web and internet services Prototypes computer industry Electrical equipment industry Microcomputers

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GPU Accelerating for Rapid Multi-core Cache Simulation

GPU Accelerating for Rapid Multi-core Cache Simulation

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IEEE International Symposium on Parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

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

To find the best memory system for emerging workloads, traces are obtained during application's execution, then caches with different configurations are simulated using these traces. Since program traces can be several gigabytes, simulation of cache performance is a time consuming process. Compute unified device architecture (CUDA) is a software development platform which enables programmers to accelerate the general-purpose applications on the graphics processing unit (GPU). This paper presents a real time multi-core cache simulator, which was built based on the Pin tool to get the memory reference, and fast method for multi-core cache simulation using the CUDA-enabled GPU. The proposed method is accelerated by the following techniques: execution parallelism exploration, memory latency hiding, a novel trace compression methodology. We describe how these techniques can be incorporated into CUDA code. Experimental results show that the hybrid parallel method of time-partitioning combines with set-partitioning presented here is 11.10× speedup compared to the CPU serial simulation algorithm. The present simulator can characterize cache performance of single-threaded or multi-threaded workloads at the speeds of 6-15 MIPS. It can simulates 6 cache configurations within one single pass at this speeds compared to CMP$im, which can only simulate one cache configuration each simulation pass at the speeds of 4-10 MIPS.

关键词： Graphics processing unit Instruction sets Computational modeling Parallel processing Instruments Partitioning algorithms

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Feature Extraction and Matching of 3D Face Model Based on Facial Landmark Detection

Feature Extraction and Matching of 3D Face Model Based on Fa...

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2020 International Conference on virtual reality and Visualization, ICVRV 2020

作者： Zhu, Yunrui Luo, Xun Zuniga, Claudia Lozano-Garzon, Carlos Alomia, Gustavo School of Computer Science and Engineering Tianjin University of Technology Tianjin China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Faculty of Engineering Santiago Cali University Cali Colombia Los Andes University Department of System Engineering and Computation Bogota Colombia

ISBN: (纸本)9780738142524

Building a high-quality 3D face model is one of the important issues in computer graphics. High-fidelity 3D face model can be obtained through 3D reconstruction methods from measured data, but the reconstructed models are often flawed with missing measurement data. In order to improve the usability and robustness of the 3D face models, repair and optimization of the face model are critically important. The traditional solutions rely on geometric heuristics to complete repairing work. Considering the characteristics of the face, it is possible to utilize the semantic information to improve the quality of repairing process for the three-dimensional face models, thereby improving the accuracy of the repaired models. In this paper, we combine artificial intelligence and computer graphics methods, and proposes a feature extraction and matching of 3D face model method based on facial landmark detection. Our method combines the facial feature recognition algorithm of 2D facial image and the mapping relationship of 3D face mesh model, and realizes the function of semanticsegmentation and extraction of the 3D face model features. It can be used for the next step of 3D face mesh repair research. © 2020 IEEE.

关键词： Face recognition

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Modeling detailed cloud scene from multi-source images 26

Modeling detailed cloud scene from multi-source images

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26th Pacific Conference on computer Graphics and Applications, Pacific Graphics 2018

作者： Cen, Yunchi Liang, Xiaohui Chen, Junping Yang, Bailin Li, Frederick W.B. State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing100191 China School of Computer Science and Information Engineering Zhejiang Gongshang University Hangzhou310018 China Department of Computer Science University of Durham DurhamDH1 3LE United Kingdom

ISBN: (纸本)9783038680734

Realistic cloud is essential for enhancing the quality of computer graphics applications, such as flight simulation. Data-driven method is an effective way in cloud modeling, but existing methods typically only utilize one data source as input. For example, natural images are usually used to model small-scale cloud with details, and satellite images and WRF data are used to model large scale cloud without details. To construct large-scale cloud scene with details, we propose a novel method to extract relevant cloud information from both satellite and natural images. Experiments show our method can produce more detailed cloud scene comparing with existing methods. © 2018 The Author(s).

关键词： Flight simulators

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Fast optical wavefront engineering for controlling light propagation in dynamic turbid media

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Journal of Innovative Optical Health sciences 2019年第4期12卷 46-66页

作者： Meiyun Xia Deyu Li Ling Wang Daifa Wang School of Biological Science and Medical Engineering Beihang University Beijing100083P.R.China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing100083P.R.China State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing100083P.R.China College of Computer Science Sichuan Normal University Chengdu610101P.R.China

While propagating inside the strongly scattering biological tssue,photons lose their incident directions beyond one transport mean free path(TMFP,~1 millimeter(mm)),which makes it challenging to achieve optical focusing or clear imaging deep inside *** manipulating many degrees of the incident optical wavefront,the latest optical wavefront engineering(WFE)technology compensates the wavelfront distortions caused by the scattering media and thus is toward breaking this physical limit,bringing bright perspective to many applications deep inside tissue,eg,high resolution functional/molecular imaging,optical excitation(optogenetics)and optical ***,inside the dynamic turbid media such as the biological tissue,the wavefront distortion is a fast and continuously changing process whose decorrelation rate is on timescales from milliseconds(ms)to microseconds(μs),or even *** requires that the WFE technology should be capable of beating this rapid *** this review,we discuss the major challenges faced by the WFE technology due to the fast decorrelation of dynamic turbid media such as living tissue when achieving light focusing/imaging and summarize the research progress achieved to date to overcome these challenges.

关键词： Fast wavefront engineering optical phase conjugation feedback-based iterative wavefront optimization transmission matrix decorrelation time

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Simulating the Dilution of Sulfuric Acid on Mixed reality Platform 8

Simulating the Dilution of Sulfuric Acid on Mixed Reality Pl...

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8th International Conference on virtual reality, ICVR 2022

作者： Pan, Zhipeng Miao, Jinda Cai, Ning Luo, Tianren Zhang, Mingmin Pan, Zhigeng Research Institute of Virtual Reality and Intelligent Systems Hangzhou Normal University Hangzhou China Zhejiang University College of Computer Science and Technology Hangzhou China Institute of Software Chinese Academy of Sciences State Key Laboratory of Computer Science and Beijing Key Lab of Human-Computer Interaction Beijing China Nanjing University of Information Science and Technology School of Artificial Intelligence Nanjing China

ISBN: (数字)9781665479110

ISBN: (纸本)9781665479110

Augmented reality technology has been widely used in experimental education. Augmented reality provides virtual-real integration, real-Time interaction and three-dimensional immersion, which provides a new development direction for simulating the teaching environment and promoting learning interaction. We have developed an MR experiment of diluting concentrated sulfuric acid, which helps students learn experimental manipulations and scientific concepts before conducting real chemical experiments. virtual experiments can avoid the risks of real chemical experiments and reduce the waste of chemical materials. At the same time, we correctly render the occlusion relationship between the hand, the beaker and the virtual liquid, providing a realistic experimental effect. The tracking of multiple cameras allows students to interact more naturally. We compared the availab.lity and students' attitudes of three virtual experiments about diluting concentrated sulfuric acid. The results show that the usability of the MR experimental system reaches the level of user satisfaction. The realistic visual effects and natural interaction method of the MR experiment have been recognized by the students. © 2022 IEEE.

关键词： Students

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A Multi-metric QoS Routing Method for Ad Hoc Network

A Multi-metric QoS Routing Method for Ad Hoc Network

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Jing Cao Wei Wu State Key Lab of Virtual Reality Technology and Systems School of Computer Science Beihang University Beijing China

A multimetric QoS routing protocol (MQOLSR) is proposed in this paper, which providing different QoS for different applications flow in an ad hoc network. The protocol, which integrates QoS measurement and packet forwarding, expands the topology discovery and routing computing mechanism of the OLSR protocol. It can provide different routing and forwarding service according to different application flow. The experimental results show that the MQOLSR protocol improves the network performance. Compared to the traditional OLSR protocol, the proposed routing protocol increases network throughput by 31.8% and reduces delay jitter when transmitting IPTV, while its routing overhead and routing discovery time are within an acceptable range.

关键词： Ad hoc networks Bandwidth Routing protocols Jitter Network topology computer networks virtual reality computer science Delay effects Access protocols

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A virtual Forces Based Target Detection Enhancing Approach for Video Sensor Networks

A Virtual Forces Based Target Detection Enhancing Approach f...

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The 11th IEEE International Conference on Communications systems(第11届电子和电气工程师协会国际通信系统会议)(IEEE ICCS 2008)

作者： Zhao-feng Zhang Wei Wu State Key Lab of Virtual Reality Technology and Systems School of Computer Science Beihang University BeijingChina

The region coverage is an important affecting factor of target detection performance in wireless video sensor networks (WVSN). However, the traditional region coverage can not estimate the target detection performance properly, so the concept of Effective Coverage is introduced in this paper, which can be considered as the equivalent of target detection performance. Moreover, we propose an effective coverage-enhancing approach for video sensor networks based on virtual forces and the directional sensing model. This approach provides a unified modeling of both sensor node and special area, and defines different states of sensor nodes, including free and restraint state. On this basis, the state switch mechanism and selfadaptive adjusting algorithm in the corresponding models are presented to achieve the target detection performance enhancing indirectly. Simulation results are also presented to demonstrate the performance of these algorithms.

关键词： WVSN virtual force target detection

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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(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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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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