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IASTED International Conference on Modelling, Simulation, and Identification, MSI 2009

作者： Liu, Yuexiao Gao, Xiaopeng Wu, Xingbo Lv, Liangshuang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9780889868106

A modeling and simulation tool called SimRC is described in this paper. It is dedicated to improve the efficiency of reconfigurable computing development. In SimRC, a new architecture description language is designed for architecture modeling, and the target architecture simulator is generated according to that model with our code generation approach. In this way, SimRC achieves the general purpose in a certain scope. The results of the preliminary experiments show that not only SimRC is able to model various architectures, but also it achieves the high simulation efficiency.

关键词： Simulators

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Seamless virtual machine live migration on network security enhanced hypervisor

Seamless virtual machine live migration on network security ...

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2009 2nd IEEE International Conference on Broadband Network and Multimedia technology, IEEE IC-BNMT2009

作者： Xianqin, Chen Han, Wan Sumei, Wang Xiang, Long State Key Laboratory of Virtual Reality Technology System School of Computer Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

ISBN: (纸本)9781424450053

Since the virtual network traffic is invisible outside the hypervisor, it is impossible for traditional network-base security devices to harness the attacks happened in virtual computing environment. Industry and academies adopt the network security enabled hypervisor (NSE-H) to protect virtual machines (VM) residing in the virtual network. In this paper, we identified the insufficiency of the existing live migration implementation, which prevents itself from providing transparent VM relocation between NSE-Hs. This occurs because the contemporary migration implementation only takes VM encapsulated states into account, but ignores VM related security context(SC) needed by NSE-H embedded security engines (SE). We presented a comprehensive live migration framework for the NSE-H, considering both the execution context encapsulated in VM instance and the VM related security context within the SEs. We built a prototype system of the framework based on stateful firewall enabled Xen hypervisor. Our experiment was performed with realistic applications and the results demonstrate that the solution complements the insufficiency without introducing significant performance downgrade. Even in the worst case, the downtime that occurs during migration increases no more than 15%, comparing to existing implementation. ©2009 IEEE.

关键词： Network security

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Research of spread language for worm simulating in CNO exercises

Research of spread language for worm simulating in CNO exerc...

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1st International Conference on Information Science and Engineering, ICISE2009

作者： Xiao, Qing Jiao, Jian GuangXi Normal University GuiLin China State Key Laboratory of Virtual Reality Technology and System Key Laboratory of Beijing Network Technology Beihang University Beijing China

ISBN: (纸本)9780769538877

An important ability of computer network opeartion exercise is to implement a large scale worm spreading events in short time. A spread action language is *** Language can achieve actions of worms such as gaining access, transfering and activating in simulation environment. Experiments in GTNets and VM platform indicated the language emulate intrusion actions spreading effectively in operation exercise. ©2009 IEEE.

关键词： Computer simulation languages

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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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A Neural-Network Based technology of Data Distribution Management in Distributed virtual Environment

A Neural-Network Based Technology of Data Distribution Manag...

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International Conference on Computational Intelligence and Software Engineering (CiSE)

作者： Jiong Zhang Xiaoyong Lei Shuling Dai Na Chen State Key Laboratory of Virtual Reality Technology and System BeiHang University Beijing China

In distributed virtual environment many methods of data distribution management (DDM) are presented to efficiently improve network traffic situation and save system resources, these technologies are based on virtual environment partition. The grid size of the partition affects the data distribution results. This paper aims to present a neural-network based study mechanism, which adjusts the grid size dynamically in the virtual environment. The simulation results indicate that by using this technique, better experimental results and practicability were achieved regardless the DDM used. And there is a significant improvement in system scalability.

关键词： Environmental management technology management virtual environment Avatars Distributed decision making Filtering virtual reality Subscriptions Computational modeling Routing

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Haptic-Visual Interaction Training system for Refueling Aircraft

Haptic-Visual Interaction Training System for Refueling Airc...

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International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Guanyang Liu Wanlin Zhou Liu Muli Ju Wang State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

ISBN: (纸本)9781424441327

The goal of this paper is to develop haptic-visual interaction training system for aircraft fuel supply simulation. Operators can use this system to simulate refueling aircraft in virtual environment with tactile and visual feedback. The simulator is built based on haptic device Omega 3DOF. Hardware and software are discussed to meet the requirement of training simulation. Experiment results show that the system can provide stable simulation of aircraft refueling operation.

关键词： Haptic interfaces Fuels virtual environment Aircraft propulsion Displays Rendering (computer graphics) Assembly Aerospace engineering Feedback Engines

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A modeling approach of mobile ad hoc networks survivability model

A modeling approach of mobile ad hoc networks survivability ...

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1st International Conference on Information Science and Engineering, ICISE2009

作者： Wang, Haiquan Ma, Xinyi Xia, Chunhe Hao, Senshen State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Key Laboratory of Beijing Network Technology Beihang University Beijing China College of Software Beihang University Beijing China Shool of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769538877

Survivability has become a focal point of research. Simulation is a common method for experimental verification to identify the advantages and deficiencies of survivability models and architectures. This paper proposes a modeling approach of mobile ad hoc network survivability model which support the automatic transformation to a simulation instance. A new survivability model MARC based on the idea of ARC model is conducted. Within this model, the concepts of network services and events are analyzed and formally descript in details. Base on these works, we design MARCDL and outline the important EBNF in this paper. Use of this language is illustrated by a case study. ©2009 IEEE.

关键词： Mobile ad hoc networks

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Real-time realistic rendering of tissue surface with mucous layer

Real-time realistic rendering of tissue surface with mucous ...

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2nd International Workshop on Computer Science and Engineering, WCSE 2009

作者： Hao, Aimin Song, Feng Li, Shuai Liu, Xuemei Xu, Xuping State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Department of Information and Engineering North China Institute of Water Conservancy and Hydroelectric Power Zhengzhou China East China Institute State Forestry Administration Zhejiang China

ISBN: (纸本)9780769538815

This paper deals with the rendering issues of producing a realistic surgery simulation in real-time. In general, the visual fidelity of the simulator determines the degree of realism experienced by users. On top of the tissue, there is a mucous layer which is wet and semi-transparent. It significantly influences the surface appearance by reflecting and scattering incoming light rays. This paper describes a novel method to rendering such organs. It decomposes the incoming light into two parts, which include surface specular reflectance and subsurface scattering. First it uses bump mapping to disturb the surface normal in order to rendering the specular highlight. Then it uses an image-space algorithm to calculating the subsurface scattering contribution. © 2009 IEEE.

关键词： Tissue

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A task-deployment model for the simulation of computer network attack and defense exercises

A task-deployment model for the simulation of computer netwo...

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1st International Conference on Information Science and Engineering, ICISE2009

作者： Yang, Yi Jiao, Jian Wang, Haiquan Xia, Chunhe State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Key Laboratory of Beijing Network Technology Beihang University Beijing China College of Software Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769538877

The task-deployment models of simulation, is mainly used to solve the problem of the unreasonable tasks partition in the simulation of distributed computer network attack and defense exercises. This paper gives a task-deployment model for the simulation of computer network attack and defense exercises through analyzing and formally describing the input, output and the environment of deployment model, constructing the pushdown automaton model of task-deployment - PDAMTD, and validating the termination of the model. This formal validation shows that this model could be computed to the end, and this model prepares for specific algorithms of deployment in theory. ©2009 IEEE.

关键词： Distributed computer systems

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An adaptive physically-based deformation on distance fields

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Journal of Information and Computational Science 2009年第6期6卷 2263-2270页

作者： Wu, Xiaoxiao Liang, Xiaohui Xu, Qidi State Key Lab. of Virtual Reality Technology School of Computer Science Beihang University Beijing 100191 China

This paper presents a novel adaptive deformation algorithm by integrating the representations of ADFs and physically based deformable models. The octree-based adaptively sampled distance fields (ADFs) are employed as the shape representation. The deformation of the ADFs is governed by the principle of physical dynamics and achieved by manipulating the scalar fields directly. A dynamic adaptive resampling scheme for ADFs is used during deformations. The physically based model of mass-spring is integrated into irregular fields for deformation. The stiffness of the non-uniform springs in the system is adaptive to spatial resolution of ADFs to avoid non-homogeneity in physics caused by the irregular structure. The results show that our physically based deformation algorithm based on the representation of ADFs outperforms regular sampled distance field based deformation algorithm in terms of time and memory efficiency, and has potential applications in physically-based interactive sculpting. © 2009 Binary Information Press.

关键词： Deformation

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