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International Workshop on Grid computing

作者： Ge Cheng Hai Jin Deqing Zou Xinwen Zhang Min Li Chen Yu Guofu Xiang Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Samsung Information Systems America Inc. San Jose CA USA

In grid and cloud computing infrastructures, the integrity of a computing platform is a critical security requirement in order to provide secure and honest computing environments to service providers and resource consumers. However, due to the fact that software components running on a single platform are usually provided and maintained by different authorities which are potentially untrusted to each other, the problem to monitor and protect runtime system integrity become very challenging and has not been well addressed yet. In this paper, we present a virtualization based dynamic integrity protection method which ensures that only appropriate authorities can control over their components without interfering with other component providers or authorities. In our solution, integrity requirements defined by the authorities of upper components (e.g., service middleware and applications) are respected by preventing the underlying components (e.g., operating system) from exposing their sensitive data, which can be caused by update of the underlying components or other malicious actions. We implement our solution on Xen-based platform, and our evaluation results show that the solution is effective for integrity protection with acceptable performance overhead.

关键词： Protection Cloud computing Grid computing Application software Hardware Portable computers Middleware Physics computing Operating systems computer science

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Wireless acoustic sensor network with compressive sampling

Wireless acoustic sensor network with compressive sampling

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

作者： Qiao, Daoe Luo, Hong Xu, Xiaoli Beijing Key Laboratory Measurement and Control of Mechanical and Electrical System Beijing Information Science and Technology University Beijing 100192 China School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9780889868106

We design a complete platform of wireless acoustic sensor network, featuring with compressive sampling and adaptive sampling. The compressive sampling is a new theory that combines sampling and compression into a single linear measurement process. It captures signals at a rate significantly below the Nyquist rate, and recovers exactly the original signals using convex optimization or greedy algorithm. In addition, we adopt an adaptive sampling scheme, in which the sampling rates can be changed with the running stages. The detective stage works at a lower rate than the monitoring stage. There is only one sensor node running at monitoring stage for the interested event. Through experiments, we illustrate that the wireless acoustic sensor network we built achieves dramatic low sampling rate and utilizes the network bandwidth much more effective.

关键词： Compressed sensing

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Removing local irregularities of triangular meshes with highlight line models

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science in China(Series F) 2009年第3期52卷 418-430页

作者： YONG JunHai DENG BaiLin CHENG FuHua WANG Bin WU Kun GU HeJin School of Software Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China Department of Computer Science University of Kentucky Lexington KY 40506-0046 USA Key Laboratory for Information System Security Ministry of Education of China Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China jianaxi Academy of Sciences. Nanchang 330029. China

The highlight line model is a powerful tool in assessing the quality of a surface. It increases the flexibility of an interactive design environment. In this paper, a method to generate a highlight line model on an arbitrary triangular mesh is presented. Based on the highlight line model, a technique to remove local shape irregularities of a triangular mesh is then presented. The shape modification is done by solving a minimization problem and performing an iterative procedure. The new technique improves not only the shape quality of the mesh surface, but also the shape of the highlight line model. It provides an intuitive and yet suitable method for locally optimizing the shape of a triangular mesh.

关键词： highlight lines mesh optimization shape modification model repair

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Grey Prediction Control of Adaptive Resources Allocation in Virtualized computing system

Grey Prediction Control of Adaptive Resources Allocation in ...

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IEEE International Symposium on Dependable, Autonomic and Secure computing (DASC)

作者： Xianghua Xu Yanna Yan Jian Wan Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

In order to improve the resource utilization of virtual machine and control the resource allocation online effectively, in this paper, we present a grey prediction control model used for dynamic resource allocation in virtual machine as workloads changing. First, we forecast the allocation of virtualized resources by the grey control model. We also adjust the boundary conditions of grey prediction model to make the prediction more accurately. Then, the control theory is used to feedback control resource utilization to obtain desired resource utilization levels by regulating the value of allocation of virtualized resources automatically. Our experimental results show the grey control model is effective in the virtualized resource allocation. The control model and algorithm can be applied to other resource allocation.

关键词： Control systems Programmable control Adaptive control Resource management Resource virtualization Predictive models Automatic control Virtual machining Boundary conditions Control theory

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A Utility-Based Adaptive Resource Allocation Policy in Virtualized Environment

A Utility-Based Adaptive Resource Allocation Policy in Virtu...

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IEEE International Symposium on Dependable, Autonomic and Secure computing (DASC)

作者： Jian Wan Peipei Shan Xianghua Xu Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

How to meet the QoS of the applications and improve resource utilization is an important problem in virtualized environment. In this paper, we propose a utility based resource allocation policy with QoS constrained in virtualized environment. Firstly, we build a model reflecting the mapping relation between performance metrics and resource allocation through Web server benchmarking experiments. Then, we devise a utility function as objective to optimizing the total utility and achieving a reasonable resource allocation. Finally, based on the model and the requirements of the applications QoS, we present an optimized policy for resource allocation in virtualized system. The simulation results show that the utility-based policy is effective to allocate resource from user perspective while improving the resource utilization.

关键词： Resource management Resource virtualization Application virtualization Quality of service Grid computing Application software Costs Measurement Web server Hardware

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The organic plastic photonic crystal for terahertz filter

The organic plastic photonic crystal for terahertz filter

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2009 International Conference on Optical Instruments and technology, OIT 2009

作者： Liang, Binming Yao, Cuiya Di, Qianli Chen, Jiabi Zhuang, Songlin Shanghai Key Laboratory of Contemporary Optics System School of Optical - Electrical and Computer Engineering University of Shanghai for Science and Technology 516 Jungong Road 200093 Shanghai China

ISBN: (纸本)9780819478986

This paper is mainly concerned with the study of the PBG (Photonic Band Gap) in 2D photonic crystal which consists of a hexagonal lattice of circular dielectric rods with Polyethylene. The result indicates that its PBG is very narrow. According that, a narrow band filter has been obtained by choosing certain parameters of the photonic crystal. © 2009 SPIE.

关键词： Photonic band gap

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Novel system for automatic measuring diopter based on ARM circuit block

Novel system for automatic measuring diopter based on ARM ci...

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International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device technology for Sensors

作者： Xue, Feng Zhong, Lei Chen, Zhe Xue, Deng-Pan Li, Xiang-Ning School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China Shanghai Key Laboratory of Modern Optical System Shanghai 200093 China

ISBN: (纸本)9780819476623

Traditional commercial instruments utilized in vision screening programs cannot satisfy the request for real-time diopter measurement by far, and their success is limited by some defectiveness such as computer-attached, clumsy volume, and low accuracy of parameters measured, etc. In addition, astigmatic eyes cannot be determined in many devices. This paper proposes a new design of diopter measurement system based on SAMSUNG's ARM9 circuit block. There are several contributions in the design. The new developed system has not only the function of automatically measuring diopter, but also the advantages of the low cost, and especially the simplicity and portability. Besides, by placing point sources in three directions, the instrument can determine astigmatic eyes at the same time. Most of the details are introduced as the integrated design of measuring system, interface circuit of embedded system and so on. Through a preliminary experiment, it is proved that the system keeps good feasibility and validity. The maximum deviation of measurement result is *** experimental results also demonstrate the system can provide the service needed for real-time applications. The instrument present here is expected to be widely applied in many fields such as the clinic and home healthcare. © 2009 SPIE.

关键词： Embedded systems

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LAOVM: Lightweight Application-Oriented Virtual Machine for Thread Migration

LAOVM: Lightweight Application-Oriented Virtual Machine for ...

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International Conference on computer and Information science (ACIS)

作者： Xiaofei Liao Yifan Yue Hai Jin Haikun Liu Services Computing Technology and Systems Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

This paper describes the scheme of thread migration in a language virtual machine LAOVM - lightweight application-oriented virtual machine. To maintain high portability and flexibility, thread migration is implemented at language level. To migrate process or thread in runtime in LAOVM, the following issues are addressed: (1) supporting kinds of applications implemented by different programming language; (2) enabling transparent process migration indifferent operating system; (3) implementing fine-grained mobility. Experimental results show that the downtime of thread migration is reasonably small, even the application runtime image is required for occupying massive memory blocks.

关键词： Virtual machining Yarn Operating systems Grid computing Paper technology Runtime computer languages Kernel Information science computer science

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Secure authentication and authorization scheme for mobile devices

Secure authentication and authorization scheme for mobile de...

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2009 IEEE International Conference on Communications technology and Applications, IEEE ICCTA2009

作者： Jian, Wang Nan, Jiang School of Computer and Information Technology Beijing Jiaotong University Beijing China College of Computer Science Beijing University of Technology Beijing China Key Laboratory of Communication and Information System Beijing Municipal Commission of Education Beijing Jiaotong University Beijing China

ISBN: (纸本)9781424448203

Future mobile devices are expected to access different networks (such as 3rd generation network, WLAN, Bluetooth, Internet, and etc). Hence many sensitivity data are stored in them. How to protect the security of information and applications about mobile devices becomes an exigent problem. This paper proposes a secure authentication and authorization protocol for mobile devices. The protocol employs biometric identification and password mechanism. Different users could access different information and applications, which are associated with different security levels. Users, mobile equipments and universal subscriber identity module (USIM) could mutual authenticate. Messages are encrypted when they are exchanged. ©2009 IEEE.

关键词： Authentication

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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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