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International Conference on High Voltage Engineering and Application, ICHVE

作者： Yushun Zhao Jian Li Jianlin Hu Stanislaw Grzybowski State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China Department of Electrical and Computer Engineering High Voltage Laboratory MS USA

This paper presented a novel polydimethylsiloxane /nano-silica (PDMS/nano-silica) hybrid super-hydrophobic coating for anti-icing on insulators. Average water contact angle on the super-hydrophobic PDMS/nano-silica hybrid coating reached 161°. The super-hydrophobic PDMS/nano-silica hybrid coating had a rough surface with micro/nanometer dual-size structure. Icing experiment was carried out to investigate the anti-icing properties of the super-hydrophobic coating on insulator strings. AC icing flashover voltages of the two types of insulator strings were investigated. Results showed that the super-hydrophobic PDMS/nano-silica hybrid super-hydrophobic coating excellently restrained the icing on insulator strings. The AC flashover voltage of the ice coated insulator string with the super-hydrophobic PDMS/nano-silica hybrid coating was 100 kV which was higher than that of the ice coated insulator string with RTV silicone rubber coating.

关键词： Coatings Surface treatment Rubber Ice Flashover Silicon compounds

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SimK:A Large-Scale Parallel Simulation Engine

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Journal of computer Science & Technology 2009年第6期24卷 1048-1060页

作者：许建卫陈明宇郑规曹政吕慧伟孙凝晖 Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

Simulation is an important method to evaluate future computer systems. Currently microprocessor architecture has switched to parallel, but almost all simulators remained at sequential stage, and the advantages brought by multi-core or many-core processors cannot be utilized. This paper presents a parallel simulator engine （SimK） towards the prevalent SMP/CMP platform, aiming at large-scale fine-grained computer system simulation. In this paper, highly efficient synchronization, communication and buffer management policies used in SimK are introduced, and a novel lock-free scheduling mechanism that avoids using any atomic instructions is presented. To deal with the load fluctuation at light load case, a cooperated dynamic task migration scheme is proposed. Based on SimK, we have developed large-scale parallel simulators HppSim and HppNetSim, which simulate a full supercomputer system and its interconnection network respectively. Results show that HppSim and HppNetSim both gain sound speedup with multiple processors, and the best normalized speedup reaches 14.95X on a two-way quad-core server.

关键词： large scale system simulation fine-grained synchronization simulation framework lock-free synchronization

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A systematic gain setting method of the positive feedback anti-islanding scheme for inverter-based distributed generators

A systematic gain setting method of the positive feedback an...

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International Conference on Power system Technology (POWERCON)

作者： Xiaoyu Wang Shouzhen Zhu Jing Yong Jinghong Zheng Wilsun Xu State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing China Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

This paper proposes a systematic gain setting method for the positive feedback anti-islanding scheme which is designed to protect the interconnected inverter-based distributed generators (DGs) from islanding operation. Two main factors affecting the performance of the anti-islanding scheme are investigated when the positive feedback gain is tuned. One is the stability impact of the anti-islanding control on distributed generation (DG) systems and the other is the islanding detection time of the anti-islanding scheme. The small-signal model and the electromagnetic transient simulation model of an inverter-based DG system are developed to facilitate the realization of the proposed gain setting method. This method provides a practical and reliable tool for DG planning engineers.

关键词： Laboratories Electromagnetics

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Engineering a scalable Boolean matching based on EDA SaaS 2.0 10

Engineering a scalable Boolean matching based on EDA SaaS 2....

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IEEE International Conference on computer-Aided Design

作者： Chun Zhang Yu Hu Lingli Wang Lei He Jiarong Tong State Key Laboratory of ASIC and System Fudan University China Electrical and Computer Engineering Department University of Alberta Canada Electrical Engineering Department University of California Los Angeles USA

ISBN: (纸本)9781424481927

Software as a Service (SaaS) 1.0 signifcantly lowers the infrastructure and maintenance cost and increases the accessibility of the software by hosting software via the web. Compared with SaaS 1.0, SaaS 2.0 is more flexible since it leverages software tools from both server and client sides with closer interaction between them. The SaaS 2.0 paradigm provides new opportunities and challenges for EDA. In this paper, we take Boolean matching, one of the core sub algorithms in logic synthesis for field programmable gate arrays (FPGAs), as a case study. We investigate the advantages and challenges of implementing a scalable EDA algorithm under SaaS 2.0 paradigm from a technical perspective. We propose SaaS-BM, a new Boolean matching algorithm customized to take full advantage of the cloud while addressing concerns such as security and the internet bandwidth limit. Extensive experiments are performed under a networked environment with concurrent accesses. Integrated into a post-mapping re-synthesis algorithm minimizing area, the proposed SaaS-BM is 863X times faster than state-of-the-art SAT-based Boolean matching with 0.5% area overhead. Compared with a recent Bloom Filter-based Boolean matching algorithm, our proposed SaaS-BM is 53X times faster on large circuits with no area overhead.

关键词： Libraries Servers Databases Boolean functions Benchmark testing Table lookup

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Real-Time Activity Recognition in Wireless Body Sensor Networks: From Simple Gestures to Complex Activities

Real-Time Activity Recognition in Wireless Body Sensor Netwo...

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IEEE International Conference on Embedded and Real-Time Computing systems and Applications (RTCSA)

作者： Liang Wang Tao Gu Hanhua Chen Xianping Tao Jian Lu State Key Laboratory of Novel Software Technology Nanjing University China Department of Mathematics and Computer Science University of Southern Denmark Denmark Services Computing Technology and System Laboratory Huazhong University of Science and Technology China

Real-time activity recognition using body sensor networks is an important and challenging task and it has many potential applications. In this paper, we propose a real time, hierarchical model to recognize both simple gestures and complex activities using a wireless body sensor network. In this model, we first use a fast, lightweight template matching algorithm to detect gestures at the sensor node level, and then use a discriminative pattern based real-time algorithm to recognize high-level activities at the portable device level. We evaluate our algorithms over a real-world dataset. The results show that the proposed system not only achieves good performance (an average precision of 94.9%, an average recall of 82.5%, and an average real-time delay of 5.7 seconds), but also significantly reduces the network communication cost by 60.2%.

关键词： Real time systems Body sensor networks Acceleration Wireless communication Algorithm design and analysis Gesture recognition

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Interharmonics: Signaling processing issues and applications

Interharmonics: Signaling processing issues and applications

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IEEE General Meeting Power& Energy Society

作者： Alexandre B. Nassif Jing Yong Wilsun Xu Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

This paper discusses the difficulties related to interharmonic measurement and characterization. A simple FFT-based signal processing tool is proposed to analyze time-varying interharmonics. This tool is generally effective in determining interharmonic frequencies and magnitudes for many signaling applications, overcoming some of the issues related to interharmonic measurement. The problem of interharmonic source identification is also addressed and the limitations of a widely accepted method, the power direction method, are discussed.

关键词： Indexes Harmonic analysis Frequency measurement Power system harmonics Power measurement Voltage measurement

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VMGuard: An Integrity Monitoring system for Management Virtual Machines

VMGuard: An Integrity Monitoring System for Management Virtu...

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Haifeng Fang Yiqiang Zhao Hongyong Zang H. Howie Huang Ying Song Yuzhong Sun Zhiyong Liu University of the Chinese Academy of Sciences Beijing Beijing CN Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences China George Washington University Washington D.C. DC USA

A cloud computing provider can dynamically allocate virtual machines (VM) based on the needs of the customers, while maintaining the privileged access to the Management Virtual Machine that directly manages the hardware and supports the guest VMs. The customers must trust the cloud providers to protect the confidentiality and integrity of their applications and data. However, as the VMs from different customers are running on the same host, an attack to the management virtual machine will easily lead to the compromise of the guest VMs. Therefore, it is critical for a cloud computing system to ensure the trustworthiness of management VMs. To this end, we propose VMGuard, an integrity monitoring and detecting system for management virtual machines in a distributed environment. VMGuard utilizes a special VM, Guard Domain, which runs on each physical node to monitor the co-resident management VMs. The integrity measurements collected by the Guard Domains are sent to the VMGuard server for safe store and independent analysis. The experimental evaluation of a Xen-based prototype shows that VMGuard can quickly detect the root kit attacks while the performance overhead is low.

关键词： Driver circuits Kernel Servers Monitoring Engines Virtual machining Area measurement

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34-fs pulse generation directly from an Er:fiber laser

34-fs pulse generation directly from an Er:fiber laser

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The 5th International Symposium on Ultra-fast Phenomena & Terahertz Waves(第五届超快现象与太赫兹波国际研讨会)

作者： Ding Ma Chun Zhou Yue Cai Weijian Zong Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and NetworksSchool of Electronics Engineering and Computer Science University of Beijing Beijing 100871 P.R.China

We report 34 fs level pulse generation directly from a mode locked Er:fiber laser at a repetition rate of 230 MHz.

关键词： Ultrafast lasers Fiber lasers

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Efficient model reduction of interconnects via double gramians approximation 10

Efficient model reduction of interconnects via double gramia...

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Asia and South Pacific Design Automation Conference

作者： Boyuan Yan Sheldon X.-D. Tan Gengsheng Chen Yici Cai Department of Electrical Engineering University of California Riverside CA USA State Key Laboratory of ASIC & System Fudan University Shanghai China Computer Science Department Tsinghua University Beijing China

ISBN: (纸本)9781605588377

The gramian approximation methods have been proposed recently to overcome the high computing costs of classical balanced truncation based reduction methods. But those methods typically gain efficiency by projecting the original system only onto one dominant subspace of the approximate system gramian (for instance using only controllability gramian). This single gramian reduction method can lead to large errors as the subspaces of controllability and observability can be quite different for general interconnects with unsymmetric system matrices. In this paper, we propose a fast balanced truncation method where the system is balanced in terms of two approximate gramians as achieved in the classical balanced truncation method. The novelty of the new method is that we can keep the similar computing costs of the single gramian method. The proposed algorithm is based on a generalized SVD-based balancing scheme such that the dominant subspace of the approximate gramian product can be obtained in a very efficient way without explicitly forming the gramians. Experimental results on a number of published benchmarks show that the proposed method is much more accurate than the single gramian method with similar computing costs.

关键词： Reduced order systems Costs Controllability Approximation methods Error correction Observability Integrated circuit interconnections Large-scale systems Equations Control systems

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A Method for Data Stream Processing Based on Curve Fitting

A Method for Data Stream Processing Based on Curve Fitting

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2010 2nd International Conference on Signal Processing system(2010年信号处理系统国际会议 ICSPS 2010)

作者： Yixu Song Jing Hu Xiaokui Yang Xiufen Xie Jie Fu State Key Laboratory of Intelligent Technology and System Department of Computer Science and Technol Department of Computer Science and Technology University of Science and Technology Beijing Beijing Sany Intelligent Control Equipment CO.LTD Changsha Hunan China

The sampling storage method which used in the current data stream could not respond data tendency effectively. For the problem, this paper presents a new processing method based on curve fitting. A weighted least square principle is used to fit the cached stream data and better model description is obtained. Then the fitting results are analyzed by clustering algorithm, which serves as a classifier for polynomial fitting parameters According to the clustering result, the appropriate window size will be given to fit the periodic stream data. Comparing the function solutions with the actual data, the different methods are adopted to store data according to the comparison result. The experimental results indicate that the proposed method has better fitting accuracy and compression ratio, could meet the requirement of data stream processing. And the data tendency could be responded effectively by the fitting results.

关键词： curve fitting data stream clustering least-square principle

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