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International Workshop on Database Technology and Applications

作者： Jun Zhou Ming Chen Huan Xiong Department of Computer Science Institute of Command Automation People''s Liberation Army University of Science and Technology Nanjing China Department of Computer Network China Electrical System Engineering Research Institute Beijing China

The frequent items problem is to process a stream as a stream of items and find all items occurring more than a given fraction of the time. It is one of the most heavily studied problems in data stream mining, dating back to the 1980s. Aiming at higher false positive rate of the Space-Saving algorithm, an LRU-based (Least Recently Used, LRU) improved algorithm with low frequency item pre-eliminated is proposed. Accuracy, stability and adaptability of the improved algorithm have been apparently enhanced. Experimental results indicate that the algorithm can not only be used to find the frequent items, and can be used to estimate the frequency of them precisely. The improved algorithm can be used for online processing both high-speed network packet stream and backbone NetFlow stream.

关键词： Monitoring Radiation detectors Algorithm design and analysis Accuracy Heuristic algorithms Complexity theory Classification algorithms

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Bayesian Filter Based on Anti-Spam Grid

Bayesian Filter Based on Anti-Spam Grid

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2010 International Conference on E-Health Networking,Digital Ecosystems and Techonlogies(2010电子健康网络、数字生态系统和技术国际会议 EDT 2010)

作者： LIANG YE WEIMING ZHONG ZHIYONG XIONG PENG LIU Department of Computer Engineering Suzhou Vocational University Suzhou China Grid Research Center Institute of Command Automation PLA University of Science and Technology Nanji

ISBN: (纸本)9781424455140;9781424455157

Due to the gradual increasing of spam's harm to the society, the anti-spam technology has been the focus of attention of all sectors. In this paper, we bring forward the Bayesian filter technology based on AntiSpam Grid, which can realize the cooperation among various servers and comprehensive utilization of grid resources, and ultimately improve the accuracy and efficiency of spam *** analyze the Anti-Spam Grid, design and implement the grid-based Bayesian filter, and experimentally verify the effect of the filtering system.

关键词： Bayesian Anti-spam Grid Unsolicited electronic mail grids Grid Bayesian inference filtration system complex utilization Bayesian filtering Resource utilization Servers

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Limited-memory-BFGS-based iterative algorithm for multispectral bioluminescence tomography with Huber regularization

Limited-memory-BFGS-based iterative algorithm for multispect...

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Medical Imaging 2010 - Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Feng, Jinchao Jia, Kebin Tian, Jie Qin, Chenghu Zhu, Shouping College of Electronic Information and Control Engineering Beijing University of Technology Beijing 100022 China Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences P. O. Box 2728 Beijing 100190 China Life Science Research Center Xidian University Xi'an 710071 China

ISBN: (纸本)9780819480279

Multispectral bioluminescence tomography is becoming a promising tool because it can resolve the biodistibution of bioluminescent reporters associated with cellular and subcellular function through several millimeters with to centimeters of tissues in vivo. Generally, to recover the bioluminescent sources, the source reconstruction problem is formulated as a nonlinear least-squares-type bounds constrained optimization problem. However, bioluminescence tomography (BLT) is an ill-posed problem. For the sake of stability and uniqueness of BLT, many algorithms have been proposed to regularize the problem, such as L2 norm and L1 norm. Here, we proposed a new regularization method with Huber function to regularize BLT problem to obtain robustness like L1 and rapid convergence of L 2. Furthermore, the computational burden is largely increased with the use of spectral data. Therefore, there is a critical need to develop a fast reconstruction algorithm for solving multispectral bioluminescence tomography. In the paper, a limited memory quasi-Newton algorithm for solving the large-scale optimization problem is proposed to fast localize the bioluminescent source. In the numerical simulation, a heterogeneous phantom was used to evaluate the performance of the proposed algorithm with the Monte Carlo based synthetic data. Additionally, the real mouse experiments were conducted to further evaluate the proposed algorithm. The results demonstrate the potential and merits of the proposed algorithm. © 2010 Copyright SPIE - The International Society for Optical engineering.

关键词： Constrained optimization

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Dual Actuation for High Speed Atomic Force Microscopy

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IFAC Proceedings Volumes 2010年第18期43卷 220-226页

作者： S. Kuiper A.J. Fleming G. Schitter Delft Center for Systems and Control Precision and Microsystems Engineering Delft University of Technology Mekelweg 2 2628CD Delft The Netherlands School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Automation and Control Institute Vienna University of Technology Gusshausstrasse 27-29 1040 Vienna Austria

In atomic force microscopy (AFM) the imaging speed is strongly limited by the bandwidth of the feedback loop that controls the interaction between the measurement tip and the sample. A significant increase in closed-loop bandwidth can be achieved by combining a long-range, low-bandwidth actuator with a short-range, high-bandwidth actuator, forming a dual actuated system. This contribution discusses the design of a model-based feedback controller that controls the tip-sample interaction in dual actuated AFM. In order to guarantee closed-loop stability, the dynamic uncertainties of the system are identified and taken into account in the controller design. Two different design cases are discussed, showing the trade-off between the positioning range at lower frequencies and the positioning range at higher frequencies. The designed feedback controller is implemented on the prototype AFM system and demonstrates a disturbance rejection bandwidth of 20 kHz.

关键词： Atomic Force Microscopy model-based control piezoelectric actuator dual actuation

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UTM-CM: A practical control mechanism solution for UTM system

UTM-CM: A practical control mechanism solution for UTM syste...

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2010 International Conference on Communications and Mobile Computing, CMC 2010

作者： Zhang, Ying Deng, Fachao Chen, Zhen Xue, Yibo Lin, Chuang School of Information Engineering University of Science and Technology Beijing China Department of Automation Tsinghua University Beijing China Research Institute of Information Technology Tsinghua University Beijing China Dept. Computer Science and Technology Tsinghua University Beijing China Tsinghua National Lab for Information Science and Technology Beijing China

ISBN: (纸本)9780769539898

Since emerged in 2004, Unified Threat Management (UTM) has been used widely to enhance network security protection. Typical UTM device integrates multiple security technologies, therefore its control and management involves various interfaces, message formats, communication protocols, and security policies and so on. Therefore, it is a big challenge to design and implement the configuration and management of security technologies in UTM. To address this issue, this paper proposes a practical UTM control mechanism that features ease-to-use, scalability, interoperability, highefficiency and reliability. The solution, called UTMConfiguration and Management (UTM-CM), has been implemented and its performance was evaluated. © 2010 IEEE.

关键词： Network security

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Friction feedforward compensation and position feedforward in CNC machines

Friction feedforward compensation and position feedforward i...

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7th Annual International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON 2010

作者： Suteeratanapirom, Wijin Rattanawaorahirankul, Rapeepong Laosapan, Chutima Sanposh, Peerayot Chayopitak, Nattapon Tungpimolrut, Kanokvate Kunieda, Hiroaki TAIST Tokyo Tech ICTES Program Department of Electrical Engineering Kasetsart University 50 Phahonyothin Rd. Ladyao Jatujak Bangkok 10903 Thailand Intelligent Mechatronics Automation Robotics and Control Laboratory Department of Electrical Engineering Kasetsart University 50 Phahonyothin Rd. Ladyao Jatujak Bangkok 10903 Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center 112 Thailand Science Park Phahonyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology S3-65 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan

ISBN: (纸本)9789746724913

This research proposes a method to eliminate friction effect and reduced tracking error on CNC milling machines. A CNC milling machine has many connected mechanical components which have friction effects such as ball screws and rails. To control servo motors which are used to drive X-Y table in CNC milling machine, the conventional PID controller is widely used. In this research, Panasonic motor driver is set to the torque control mode. To compensate the friction effects, the friction feedforward compensation method is proposed. Moreover, to reduce the position tracking error, position feedforward controller is used. The simulation and implementation of position control in one axis of PID with Friction Feedforward Compensation and Position Feedforward controller (FFC-PFC) are presented.

关键词： Friction

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Fault adaptive control of Overactuated systems using prognostic estimation

Fault adaptive control of Overactuated systems using prognos...

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Annual Conference of the Prognostics and Health Management Society, PHM 2010

作者： Bole, Brian M. Brown, Douglas W. Pei, Hai-Long Goebel, Kai Tang, Liang Vachtsevanos, George Department of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States Department of Automation at South China University of Technology Guagzhou510640 China NASA Ames Research Center Moffett FieldCA94035 United States Impact Technologies LLC RochesterNY14623 United States

ISBN: (纸本)9781936263011

Most fault adaptive control research addresses the preservation of system stability or functionality in the presence of a specific failure (fault). This paper examines the fault adaptive control problem for a generic class of incipient failure modes, which do not initially affect system stability, but will eventually cause a catastrophic failure to occur. This risk of catastrophic failure due a component fault mode is some monotonically increasing function of the load on the component. Assuming that a probabilistic prognostic model is available to evaluate the risk of incipient fault modes growing into catastrophic failure conditions, then fundamentally the fault adaptive control problem is to adjust component loads to minimize risk of failure, while not overly degrading nominal performance. A methodology is proposed for posing this problem as a finite horizon constrained optimization, where constraints correspond to maximum risk of failure and maximum deviation from nominal performance. Development of the methodology to handle a general class of overactuated systems is given. Also, the fault adaptive control methodology is demonstrated on an application example of practical significance, an electro-mechanical actuator (EMA) consisting of three DC motors geared to the same output shaft. Similar actuator systems are commonly used in aerospace, transportation, and industrial processes to actuate critical loads, such as aircraft control surfaces. The fault mode simulated in the system is a temperature dependent motor winding insulation degradation.

关键词： Electromechanical actuators

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GPS integrity monitoring algorithms based on tightly-coupled GPS/INS integrated system

GPS integrity monitoring algorithms based on tightly-coupled...

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2nd International Conference on Information Science and engineering, ICISE2010

作者： Fu, Li Tang, Shixing Yue, Yazhou School of Automation Science and Electrical Engineering Bei Hang University BeiJing China Department of Inertial Navigation Flight Automatic Control Research Institute AVIC Xi-An China

ISBN: (纸本)9781424480968

A two-step fault detection theory, which consists of residual Chi-square Test and velocity detection based on robust differentiation via sliding mode, is presented. Simulation indicated that with this method excellent detection results were achieved, when step fault or slowly growing slope fault occurs within GPS signal. © 2010 IEEE.

关键词： Fault detection

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Fast lane detection & tracking based on Hough transform with reduced memory requirement

Fast lane detection & tracking based on Hough transform with...

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International Conference on Intelligent Transportation

作者： Jung Gap Kuk Jae Hyun An Hoyong Ki Nam Ik Cho Department of Electrical and Computer Engineering Seoul National University Seoul South Korea Automation and Systems Research Institute WISE automotive Corporation Seoul South Korea

In this paper, we present a computationally efficient and robust lane detection algorithm based on Hough transform. The proposed method first extracts lane markings by applying 1D ridge detector to each row of an image. Given the extracted ridge points, the lane is then detected by applying Hough transform. Unlike the conventional methods, we consider only small set of line candidates which pass through a circle centered at previously detected vanishing point. The set is quite small and it is represented by a small region on a parametric domain. Hence, the proposed method needs much smaller accumulation array than conventional one and reduces the required memory. In addition, we propose modified parametric domain which encodes approximated lateral positions and the current lateral positions are searched on the modified parametric domain within certain region centered at previously detected positions. This proposed tracking scheme on the parametric domain considers temporal coherency and enables robust detection even when actual lane is weakly represented on the parametric domain. Experimental results show that the proposed method robustly detects the lane with reduced memory requirement.

关键词： Transforms Arrays Cameras Image edge detection Robustness Vehicles Detectors

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Simultaneous stabilization for descriptor systems subject to actuator saturation

Simultaneous stabilization for descriptor systems subject to...

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作者： Chen, Yuepeng Xu, Tianhe Zeng, Chunnian Zhang, Jingxin Zhou, Zude School of Automation Wuhan University of Technology Wuhan 430070 China School of Geodesy and Geomatics Wuhan University Wuhan 430079 China Xi'an Research Institute of Surveying and Mapping Xian 710054 China Electrical and Computer Systems Engineering Monash University Australia School of Mechantronic Engineering Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9787894631046

In this paper, the problem of simultaneous stabilization for r uncertain descriptor systems is investigated. The r uncertain closed-loop descriptor systems subject to actuator saturation are introduced and a sufficient condition for these systems to be simultaneously stabilized is derived. Meanwhile a design approach to the controller is designed via using linear matrix inequalities (LMIs).

关键词： Linear matrix inequalities

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