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2010 2nd International Conference on computer engineering and Technology, ICCET 2010

作者： Lan, Fang Chunlei, Wang Guoqing, Ma Department of Network Research Institute of System Engineering Beijing China Department of Computer Science Tsinghua University Beijing China

ISBN: (纸本)9781424463503

network security situation awareness provides the unique high level security view based upon the security alert events. But the complexities and diversities of security alert data on modern networks make such analysis extremely difficult. In this paper, we analyze the existing problems of network security situation awareness system and propose a framework for network security situation awareness based on knowledge discovery. The framework consists of the modeling of network security situation and the generation of network security situation. The purpose of modeling is to construct the formal model of network security situation measurement based upon the D-S evidence theory, and support the general process of fusing and analyzing security alert events collected from security situation sensors. The generation of network security situation is to extract the frequent patterns and sequential patterns from the dataset of network security situation based upon knowledge discovery method and transform these patterns to the correlation rules of network security situation, and finally to automatically generate the network security situation graph. Application of the integrated network Security Situation Awareness system (Net-SSA) shows that the proposed framework supports for the accurate modeling and effective generation of network security situation. © 2010 IEEE.

关键词： Data mining

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A simulation environment for SCADA security analysis and assessment

A simulation environment for SCADA security analysis and ass...

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International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2010

作者： Wang, Chunlei Fang, Lan Dai, Yiqi Department of Computer Science and Technology Tsinghua University Beijing China Department of Network Research Beijing Institute of System Engineering Beijing China

ISBN: (纸本)9780769539621

Simulation experiment is an important means of analyzing and assessing the security of SCADA (Supervisory Control and Data Acquisition) system, however, the existing simulation environments have some limitations in flexibility and extensibility. According to the type of industrial infrastructure and the structure of SCADA system, the abstract models of SCADA system are established, the reference architecture of SCADA system simulation environment is proposed, and the simulation environment for analyzing and assessing the security of SCADA system is designed and implemented. This simulation environment has the characteristics of extensibilities and adaptability, and integrated several components including the simulated enterprise network, OPC Client/HMI, industrial OPC server, SCADA protocol tester, SCADA RTUs, and the sensors and actuators, etc. Finally, experiment on the representative SCADA system attack scenario of has been conducted in this simulation environment to analyze and assess their security status, and the results demonstrate the effectiveness and practicability of the simulation environment. © 2010 IEEE.

关键词： SCADA systems

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Experiment of C-Band Wavelength Conversion in a Silicon Waveguide Pumped by Dispersed Femtosecond Laser Pulse

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Chinese Physics Letters 2010年第12期27卷 86-88页

作者：高士明田恩光宋琦黄月望 Salih Kagan KALYONCU Centre for Optical and Electromagnetic Research State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310058 Advanced Photonics Device and System Laboratory Department of Electrical Engineering and Computer Science University of California Irvine California 92697 USA

We experimentally demonstrate the C-band wavelength conversion using four-wave mixing in a 17-mm-long silicon-on-insulator waveguide pumped by a dispersed mode-locked femtosecond laser pulse. The idler can be observed with an incident average pump power lower than 4 dBm, and about 35 nm of conversion bandwidth from 1530nm to 1565nm is measured by using a 1550-nm pump wavelength. The pulse-pumped efficiency is demonstrated to be higher, by more than 22 dB, than the cw-pumped efficiency. The conversion efficiency variations with respect to the pump and signal powers are also investigated.

关键词： Optics quantum optics and lasers

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Formal definition method of denotational semantics and functions for PLC program language

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) 2011年第SUPPL. 1期42卷 1107-1113页

作者： Xiao, Li-Tian Gu, Ming Sun, Jia-Guang National Laboratory for Information Science and Technology School of Software Tsinghua University Beijing 100084 China Key Laboratory for Information System Security of Ministry of Education Department of Computer Science and Technology Tsinghua University Beijing 100084 China Beijing Special Engineering Design and Research Institute Beijing 100028 China

In order to verify the correctness of PLC programs by formal methods, the definition of denotational semantics on PLC program language was studied to achieve PLC programs modeling and model checking. Based on the extended λ-calculus definition, the configuration of PLC program architecture, denotational semantics of PLC programs and functions of denotational semantics were defined, which proves the basis of model checking and theorem.

关键词： Model checking

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Vision system based lane keeping assistance evaluated in a hardware-in-the-loop simulator

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ASME 2010 10th Biennial Conference on engineering systems Design and Analysis (ESDA2010)

作者： Coşkun, Fuat Tuncer, Özgür Karsligil, Elif Güvenç, Levent Department of Computer Engineering Intelligent Systems Laboratory Yildiz Technical University Istanbul Turkey Department of Mechanical Engineering Mekar Mechatronics Research Laboratories Istanbul Technical University Istanbul Turkey Department of Computer Engineering Intelligent System Laboratory Yildiz Technical University Istanbul Turkey

ISBN: (纸本)9780791849170

Lane keeping assistance systems help the driver in following the lane centerline. While lane keeping assistance systems are available in some mass production vehicles, they have not found widespread use and are not as common as ESP or ACC at the moment. Lane keeping assistance systems still need further development. Previously available systems have to be continuously adapted to newer vehicle models and fully tested after this adaptation. An image processing algorithm for lane detection and tracking, a lane keeping assistance controller design and a real time hardware-in-the-loop (HiL) simulator developed for testing the designed lane keeping assistance system are therefore presented in this paper. The high fidelity, high order, realistic and nonlinear vehicle model in Carmaker HiL runs as software in a real time simulation on a dSpace compact simulator with the DS1005 and DS2210 boards. A PC is used for processing video frames coming from an in-vehicle camera pointed towards the road ahead. Lane detection and tracking computations including fitting of composite Bezier curves to curved lanes are carried out on this PC. In the present setup, the camera used is a virtual camera attached to the virtual vehicle in Carmaker and provides video frames from the Carmaker animation screen. A dSpace microautobox is available for obtaining the lane data from the PC and the Carmaker vehicle data from the dSpace compact simulator and calculating the required steering actions and sending them to the Carmaker vehicle model. The lane keeping controller is designed in the Matlab toolbox COMES using parameter space techniques. The motivation behind this approach is to develop the lane keeping assistance system as much as possible in a laboratory hardware-in-the-loop setting before time consuming, expensive and potentially dangerous road testing. Lane detection, tracking and curved lane fit results, hardware-in-the-loop simulation results of the lane keeping controller with the image p

关键词： Controllers

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Chinese text emotion classification based on emotion dictionary

Chinese text emotion classification based on emotion diction...

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IEEE Symposium on Web Society

作者： Li, Jun Xu, Yuemei Xiong, Hao Wang, Yan National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Sciences Beijing China High-performance Network Laboratory Institute of Acoustics Chinese Academy of Sciences Beijing China National Computer System Engineering Research Institute of China Beijing China

ISBN: (纸本)9781424463572

Recently, much work have been done on text emotion classification. However, they mainly focused on the emotions expressed by authors instead of the readers. In addition, researches on simplified Chinese text emotion classification are extremely less. In this paper, we proposed a simplified Chinese text emotion classification based on readers' emotions. Mass of documents with readers' emotion tag are used as raw text sets, and Vector Space Model is used to represent each document. An emotion dictionary is created semi-automatically by using WordNet to build text vectors. We then train a Support Vector Machine classifier on preprocessed data with four emotion classes, and compared the predicate results with that from Naive Bayes classifier. Experiment results indicate that our approach performs much better on classify accuracy and efficiency. © 2010 IEEE.

关键词： Support vector machines

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UDispatch+: A user dispatching tool with automatic binding

UDispatch+: A user dispatching tool with automatic binding

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2010 International computer Symposium, ICS 2010

作者： Tu, Tang-Hsun Lee, Yuan-Cheng Hsueh, Chih-Wen Liu, Yi-Sheng Embedded System and Wireless Network Laboratory Department of Computer Science and Information Engineering National Taiwan University Taipei 106 Taiwan Department of Information Management National Chi Nan University Nantou 545 Taiwan

ISBN: (纸本)9781424476404

In multicore environment, multithreading is often used to improve application performance. However, there are some unexpected anomalies which degrade the performance of multithreading applications. Some of the unexpected anomalies come from inappropriate thread dispatching by operating system. To solve this problem, a novel User Dispatching Mechanism (UDispatch) was proposed. Through modification of application source codes with the UDispatch application programming interface (API), the application performance can be improved significantly. However, most of the time, the application source codes are not available, or it might not be suitable to do the modification of source codes. Therefore, we provide another tool to dispatch threads without any modification of application source codes, called User Dispatching Plus (UDispatch +). It can bind the application threads automatically and dispatch to specific cores at the discretion of users. We experiment UDispatch+ on multithreading multimedia applications. The results show that a more parallelized skip-line application can speed up to 171.8% on a 4-core machine, and a more dependent optimized H.264/AVC decoder can speed up to 20.1% on a 4-core machine. ©2010 IEEE.

关键词： Application programming interfaces (API)

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A generalized file replication scheme with diffusion-based storage load balancing function in unstructured P2P file-sharing networks

A generalized file replication scheme with diffusion-based s...

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2nd International Conference on Intelligent networking and Collaborative systems, INCOS 2010

作者： Takaoka, Masanori Uchida, Masato Oie, Yuji NCOS Laboratory NEC Communication Systems Kanagawa Japan Graduate School of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Network Design Research Center Kyushu Institute of Technology Tokyo Japan

ISBN: (纸本)9780769542782

In this paper, we provide a generalized file replication scheme with a storage load balancing function in unstructured P2P file-sharing networks. The generalized file replication scheme is expressed as a weighted mixture of the concepts introduced in existing schemes. A mathematical analysis shows that the system behavior realized by the generalized file replication scheme can be described by a thermal diffusion equation composed of heat, reaction and diffusion terms, the weights of which are controlled by a parameter of the mixing rate. Here, the heat term represents a function to enhance file search performance by making replicas on specific peers. The reaction term represents a function to avoid concentrations of storage loads on specific peers. The diffusion term represents a function to uniform the storage loads among peers. The simulation results show that the generalized file replication scheme enables us to control the trade-off between search and storage load balancing performances extensively and intuitively by controlling the parameter of the mixing rate. In addition, the simulation results show that the generalized file replication scheme can adapt to dynamic P2P file-sharing environments. © 2010 IEEE.

关键词： Economic and social effects

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A Framework for network Security Situation Awareness Based on Knowledge Discovery

A Framework for Network Security Situation Awareness Based o...

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2010 2nd International Conference on computer engineering and Technology(2010年第二届计算机工程与技术国际会议 ICCET 2010)

作者： Fang Lan Ma Guoqing Wang Chunlei Department of Network Research Institute of System Engineering Beijing China Department of Computer Science Tsinghua University Beijing China

ISBN: (纸本)9781424463473;9781424463497;9781424463503

network security situation awareness provides the unique high level security view based upon the security alert events. But the complexities and diversities of security alert data on modern networks make such analysis extremely difficult. In this paper,we analyze the existing problems of network security situation awareness system and propose a framework for network security situation awareness based on knowledge discovery. The framework consists of the modeling of network security situation and the generation of network security situation. The purpose of modeling is to construct the formal model of network security situation measurement based upon the D-S evidence theory,and support the general process of fusing and analyzing security alert events collected from security situation sensors. The generation of network security situation is to extract the frequent patterns and sequential patterns from the dataset of network security situation based upon knowledge discovery method and transform these patterns to the correlation rules of network security situation,and finally to automatically generate the network security situation graph. Application of the integrated network Security Situation Awareness system (Net-SSA) shows that the proposed framework supports for the accurate modeling and effective generation of network security situation.

关键词： network security:situation awareness:data mining:knowledge discovery

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Broadband wavelength conversion by nondegenerate four-wave mixing in a silicon-on-insulator waveguide

Broadband wavelength conversion by nondegenerate four-wave m...

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Integrated Photonics research, Silicon and Nanophotonics, IPRSN 2010

作者： Gao, Shiming Li, Zhiqiang Tien, En-Kuang Liu, Qiang He, Sailing Boyraz, Ozdal Centre for Optical and Electromagnetic Research State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hanghou 310058 China Advanced Photonics Device and System Laboratory Department of Electrical Engineering and Computer Science University of California Irvine CA 92697 United States

A bandwidth enhancement method is presented for silicon-on-insulator waveguidebased wavelength conversion using nondegenerate four-wave mixing. The conversion bandwidth is broadened by 28% in a 300 × 500 nm2 wave... 详细信息

ISBN: (纸本)9781557528957

关键词： Bandwidth

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