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IEEE 9th International Conference on computer and Information technology, CIT 2009

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

ISBN: (纸本)9780769538365

Trace-driven cache simulation is the most widely used method to evaluate different cache structures. Several techniques have been proposed to reduce the simulation time of sequential trace-driven simulation. An obvious way to achieve fast parallel simulation is to simulate the individual independent sets of a cache concurrently on different compute resources. We propose improvements to current trace-driven simulation methods to make them faster and more economical. This paper considers the use of generic GPU to accelerate cache simulation which exploits set-partitioning as the main source of parallelism. We develop more efficient parallel simulation techniques by introducing more knowledge into the Compute Unified Device Architecture (CUDA) on the GPU. Our experimental result shows that the new algorithm can produce performance results for a number of set-associative caches in just a single simulation run and still produce the exact results. © 2009 IEEE.

关键词： Graphics processing unit

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SimRC: An architecture modeling and simulator generation tool for reconfigurable computing development

SimRC: An architecture modeling and simulator generation too...

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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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Safe polyhedral visual hulls

Safe polyhedral visual hulls

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16th International Multimedia Modeling Conference on Advances in Multimedia Modeling, MMM 2010

作者： Chen, Guojun Su, Huanhuan Jiang, Jie Wu, Wei College of Computer and Communication Engineering China University of Petroleum Dongying China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)3642113001

The visual hull is used to 3D object modeling in real-time. In this paper, we propose a novel method to remove phantom volumes produced in the polyhedral visual hull (PVH) construction. This method calculates the visual hull by using polygon intersection. By making full use of the information PVH supplied for image planes, we finally obtain the safe polyhedral visual hull (SPVH). Unlike the method based image method, according to the construction process of the PVH, this paper presents a fast ray-volume intersection based on geometry method. Experiment results show that, without adding more cameras, this method can provide view-independent SPVH model with phantom volumes removed, which can be used in the 3D modeling and interactive system. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Phantoms

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An algorithm for evaluating credibility of CNO intelligence information using Bayesian estimation

An algorithm for evaluating credibility of CNO intelligence ...

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1st International Conference on Information Science and Engineering, ICISE2009

作者： Xia, Chunhe Sun, Yunyun Yao, Shan Zhang, Songmei Li, Xiaojian State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Key Laboratory of Beijing Network Technology Beihang University Beijing China College of Computer Science and Information Technology Guangxi Normal University Guilin China

ISBN: (纸本)9780769538877

Intelligence activity is one of the most important activities during computer Network Operation (CNO) command and decision-making process. Specially, evaluation of Intelligence Information credibility is the basic element of intelligence activity and process. This paper presents an algorithm evaluating credibility of intelligence information using Bayesian estimation AECIIB, applying to signal information depicting running status of CNO targets. AECIIB makes use of evaluators' past experience and prior distribution established in advance based on historical information about the same or similar target, and inducts Bayesian estimation theory into the integration of priori knowledge and posterior knowledge to adjust distributed parameter of prior distribution, which can be used to calculate credibility of targets' running status according to its probability of occurrence in prior distribution. In this paper, this algorithm is described in detail. The following experiment describes computation process of credibility evaluation in detail which proves that prior distribution can be changed along with new information and credibility of information is derived from the latest knowledge. ©2009 IEEE.

关键词： Probability distributions

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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 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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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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Degraded Link-disjoint multipath routing in ad hoc networks

Degraded Link-disjoint multipath routing in ad hoc networks

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International Symposium on Wireless Pervasive Computing (ISWPC)

作者： Junxia Cai Wei Wu State Key laboratory of Virtual Reality Technology and Systems Department of computer Beihang University Beijing China

This paper presents a multiple-path routing protocol, called as degraded link-disjoint multipath (DLDM) routing protocol, which is based on ad-hoc on-demand distance vector(AODV) routing protocol for ad-hoc networks. The proposed protocol establishes disjoint-link paths if disjoint-link paths exist in the network and establishes multiple-path routing that have no more than one common link according to the network condition during the route discovery procedure. This saves network bandwidth and reduces route reconstruction time when a routing path fails. Our modeling effort shows while that proposed multipath routing is significantly better than AOMDV, the performance advantage is small beyond a few paths and for long path lengths. It also shows that the routing overhead and the route reconstruction time to find a new route is reduced. We perform simulation experiments which validate these findings.

关键词： Degradation Ad hoc networks Routing protocols Network topology computer networks Distributed computing Laboratories virtual reality Bandwidth Mobile ad hoc networks

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Practice and Exploration in Multimedia technology Education

Practice and Exploration in Multimedia Technology Education

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International Workshop on Education technology and computer Science, ETCS

作者： Qi Yue State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science Beihang University Beijing China

Multimedia has become ubiquitous in nowadays world along with the rapid development of information technology. Yet the courses in todaypsilas colleges could not reflect this trend. In this paper we analyze the issues in todaypsilas multimedia education, and discuss the concepts behind the design of the multimedia course of Beihang University for undergraduate students, as well as its status of practice.

关键词： Educational technology Multimedia systems computer science education computer science Educational institutions Multimedia computing Educational products Information technology Human computer interaction Books

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