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15th International Conference on computer Modeling and Simulation, ICCMS 2023

作者： Cai, Xiangqun Lei, Xiaoyong Dai, Shuling Li, Weiqi State Key Lab. of Virtual Reality Technology and Systems Beihang University China School of Automation Science and Electrical Engineering Beihang University China

ISBN: (纸本)9798400707919

In this work, a modeling method of aircraft control column force based on system identification is proposed. Using the data of "lever force displacement"and "lever release"tests, the column force model of the longitudinal channel of the control system is established, and least square method is used to identify the model parameters. The acquired model is used for the simulation of the irreversible hydraulic control system, and the simulation results are compared with test results. It is indicated that the simulation accuracy meets the requirements of CCAR 60 for the column force model of the simulator control system. The proposed model has a simple structure and high computational efficiency. The identification method is independent of the original design parameters of the control system and has good robustness. © 2023 ACM.

关键词： Flight simulators

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A method of evolving finger vein template

A method of evolving finger vein template

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2012 International Symposium on Biometrics and Security Technologies, ISBAST 2012

作者： Tang, Darun Huang, Beining Li, Wenxin Li, Xiaoming School of Electronics Engineering and Computer Science Peking University China State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769546964

In a finger vein verification system, when running for a long time, the captured templates could be different from the registered ones because of the user habits changing, the devices ageing, and some other factors. The unsteady discrepancy between templates of the same finger affects the verification results seriously. Therefore, we design a templates evolution method to get evolving templates, which can reduce the influence of templates changing when matching. Experimental results show that using evolving templates can make the EER of the system reduced from 6.3 to 3.5. © 2012 IEEE.

关键词： Evolution Finger Vein OPM Templates

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Rendering method for multi-attribute objects based on state transition optimization strategy

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2009年第3期21卷 311-318页

作者： Chen, Zhiyu Liang, Xiaohui Yu, Zhuo State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100083 China

Efficient rendering of complex scenes has receive great attention in real-time computer graphics. Current researches are mostly concentrated on reducing the geometric complexity of the scene model such as reconstructing an LOD representation, performing visibility culling etc. However, the rendering process of complex scenes involves not only the geometric information of each object, but also multiple attributes, including lighting, material, texture, etc. The invocation of each attribute corresponds to a specific state in the rendering pipeline, frequent transfer between different states in the pipeline will introduce large amount of overhead, hence reducing the rendering efficiency. A rendering method accounting for efficient invocation of multiple attributes of objects based on state transition optimization strategies is presented. It estimates the cost for invoking each attribute of objects in the rendering pipeline and expresses the transitions between various render states as a weighted directed graph. Then the optimized sequence of state transition is obtained by optimization. Experimental results show that our proposed method can effectively reduce the overhead of state transition and improve the rendering efficiency of scenes containing large amounts of multi-attribute objects.

关键词： Efficiency

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Light space parallel-split shadow maps based on programmable GPUs

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2010年第3期22卷 388-395页

作者： Ma, Shang Liang, Xiaohui Yu, Zhuo Ren, Wei State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100191 China

Parallel-split shadow maps (PSSM) suffers from redundant rendering that unnecessarily renders same objects to multiple shadow map textures, when the light's direction and the camera's view direction are not perpendicular. To solve this problem, this paper presents a light space parallel-split shadow maps algorithm (LiSPSSM). The algorithm first divides the scene into certain layers that do not intersect each other by light's frustums in light space, and generates one shadow map for each layer to ensure that any shadow map does not have the same sample points. Then a faster synthesizing scene shadow method, which avoids operations of pixel layer determination, is given to improve GPU's efficiency. The results show that LiSPSSM effectively addresses the redundant rendering problem in PSSM and improves the efficiency and quality of real-time shadow rendering.

关键词： Graphics processing unit

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virtual reality application for maintainability design: A case study of the practical project 29

Virtual reality application for maintainability design: A ca...

引用

29th European Safety and Reliability Conference, ESREL 2019

作者： Guo, Ziyue Zhou, Dong Hao, Aimin School of Reliability and Systems Engineering Beihang University Beijing China State Key Laboratory of Virtual Reality Technology and System Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9789811127243

Maintainability an important property of the product, which is mostly determined in the design stages. Maintainability design including many aspects, such as visibility, reachability, maintenance space, ergonomics and safety. The design effect of maintainability directly influences the maintenance activity during the service stage. Today, while designers can perform maintainability design with the help of computer-aided design (CAD) software, the complexity of maintainability design poses a significant challenge to designers in terms of time cost and knowledge requirements. This paper reports a case study on how to utilize virtual reality (VR) technology to help designers with design work. A workflow is established to instruct each specific implementation step of VR, from system level to component level. The entire design work can be divided into the simulation phase and the evaluation phase. For the aspects of the maintainability, corresponding evaluation criteria and methods are established. When the simulation is finished, the designer can analysis and evaluate the maintainability status with these criteria and methods. Following the established workflow, the integrate maintainability design work for several subsystems of a helicopter is conducted. The suspected design problems are classified into three levels according to their hazard ratings. The verification on the physical prototype proves that most suspected design defects do exist. The benefits and challenges of using VR to assist maintainability design are also discussed. © 2019 European Safety and Reliability Association. Published by Research Publishing, Singapore.

关键词： virtual reality

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A novel fusion method of infrared and visible images based on non-subsampled contourlet transform 8th

A novel fusion method of infrared and visible images based o...

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8th International Conference on Image and Graphics, ICIG 2015

作者： Lu, Fei Lei, Xiaoyong State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

ISBN: (纸本)9783319219776

This paper presents a novel infrared (IR) and visible images fusion methodology based on non-subsampled contourlet transform (NSCT). NSCT shows better performance compared with usual multi-scale decomposition for its multi-scale, shift invariance, multi-direction and efficient capture of geometric structures. The proposed fusion method uses NSCT for multiresolution decomposition of the source images. The low-pass NSCT adaptive fusion weights calculated from the IR source image’s pixel statistical characteristics. The high frequency directional coefficients with max absolute value are the coefficients of the fusion NSCT high frequency. Experimental results conforms that the proposed method have better performance compared with DWT, compressed sensing based on DWT (CS-DWT), NSCT, NSCT based on spatial frequency motivated pulse coupled neural networks (SF-PCNN-NSCT) from visual effects and a list of fusion quality evaluation metrics. © Springer International Publishing Switzerland 2015.

关键词： Image fusion

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Multi-block SSD based on small object detection for UAV railway scene surveillance

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Chinese Journal of Aeronautics 2020年第6期33卷 1747-1755页

作者： Yundong LI Han DONG Hongguang LI Xueyan ZHANG Baochang ZHANG Zhifeng XIAO North China University of Technology Beijing 100144China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang 050043China Unmanned System Research Institute Beihang UniversityBeijing 100083China Guangdong Provincial Key Laboratory of Computer Vision and Virtual Reality Technology Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China State Key Laboratory of Information Engineering in Surveying Wuhan UniversityWuhan 430079China

A method of multi-block Single Shot Multi Box Detector(SSD)based on small object detection is proposed to the railway scene of unmanned aerial vehicle *** address the limitation of small object detection,a multi-block SSD mechanism,which consists of three steps,is ***,the original input images are segmented into several overlapped ***,each patch is separately fed into an SSD to detect the ***,the patches are merged together through two *** the first stage,the truncated object of the sub-layer detection result is *** the second stage,a sub-layer suppression and filtering algorithm applying the concept of non-maximum suppression is utilized to remove the overlapped boxes of *** boxes that are not detected in the main-layer are *** addition,no sufficient lab.led training samples of railway circumstance are availab.e,thereby hindering the deployment of SSD.A two-stage training strategy leveraging to transfer learning is adopted to solve this *** deep learning model is preliminarily trained using lab.led data of numerous auxiliaries,and then it is refined using only a few samples of railway scene.A railway spot in China,which is easily damaged by landslides,is investigated as a case *** results show that the proposed multi-block SSD method produces an overall accuracy of 96.6%and obtains an improvement of up to 9.2%compared with the traditional SSD.

关键词： Deep learning Multi-block Single Shot MultiBox Detector(SSD) Objection detection Railway scene Unmanned aerial vehicle remote sensing

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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 scalab.lity 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 scalab.e 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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An interactive animation system for mobile devices

International Journal of Digital Content Technology and its ...

引用

International Journal of Digital Content technology and its Applications 2011年第2期5卷 133-140页

作者： He, Zhiying Wang, Jian State Key Lab. of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

The limitations of resource on mobile devices make the animation on mobile devices become a challenge. This paper proposes a novel interactive remote animation system for mobile devices. Given a point model, the system can use motion data to drive the model to do animation, and can interactively edit the style of motion. Three modules which are data transmission, style editing, interaction and animation are included in the system. A preprocessing involves skeletonization and learning a generative model is needed for animation and style editing. Experiments show our system has natural interaction of style editing and can better display the model animation driven by the generated stylistic motion data on the mobile terminal.

关键词： Animation

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