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Congress on Evolutionary Computation

作者： K. A. Folly G. K. Venayagamoorthy Department of Electrical Engineering University of cape Town South Africa Real-Time Power Intelligent System laboratory Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO USA

Recently Population-Based Incremental Learning (PBIL) algorithm has been applied to a range of problems in engineering with promising results. However, in most of the literature the standard PBIL with fixed learning rate has been used. It has been shown that when applied to dynamic environment as the one encountered in power systems, adaptive learning rate is more appropriate to use. In this paper, Population-Based Incremental Learning (PBIL) algorithm with adaptive learning rate is used to tune the parameters of a power system controller for damping power oscillations in a multi-machine power system. The optimization of controller's parameters has been performed over pre-specified range of system operating conditions. Robustness Evaluation of the proposed controller based on eigenvalue analysis and time domain simulation shows that the proposed controller is more robust than the conventional controller over the range of operating conditions considered.

关键词： Time domain analysis Analytical models Power generation Eigenvalues and eigenfunctions

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Face recognition using gabor wavelet and self-adaptive intelligent single particle optimizer

Face recognition using gabor wavelet and self-adaptive intel...

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Chinese Conference on Pattern Recognition

作者： Zhou, Jiarui Ji, Zhen Huang, Weigan Tian, Tao College of Biomedical Engineering and Instrument Science Zhejiang University Hangzhou 310027 China College of Computer Science and Software Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Embedded System Design Shenzhen 518060 China

ISBN: (纸本)9781424472109

A Gabor wavelet based face recognition algorithm of PSOGabor is introduced in this paper. By using particular Gabor filters in feature extraction on important region of face image, PSOGabor can attain more representative feature information with less processing time. To overcome the drawback of overly dependence on the input parameters in intelligent single particle optimizer (ISPO), an improved algorithm of self-adaptive ISPO (AdpISPO) is proposed in this paper. With no critical parameter required, AdpISPO can achieve higher performance than original algorithms. Experimental results demonstrated that, by employing AdpISPO in Gabor filters' selection, PSOGabor can attain higher recognition rate with less computational time. ©2010 IEEE.

关键词： Face recognition

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Enhanced weakly trained frontal face detector for surveillance purposes

Enhanced weakly trained frontal face detector for surveillan...

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： Wael Louis K. N. Plataniotis Yong Man Ro Multimedia Laboratory Edward S. Rogers Department of Electrical and Computer Engineering University of Toronto Toronto Canada Image and Video System Laboratory Korea Advanced Institute of Science and Technology Daejeon South Korea

Face detection is becoming popular in surveillance applications; however, the need of enormous size face/non-face dataset, large number of features, and long training time are persistent problems. This paper claims that only a subset of the total number of features conserves the major power to detect faces; hence, this subset is capable to detect faces with high detection rate. The proposed detector fuses the results of two classifiers where one is trained with only 40 Haar-like features and the other is trained with only 50 LBP Histogram features. A pre-processing stage of skin-tone detection is applied to reduce the false positive rate. The detector is examined on real-life low-resolution surveillance sequence. Conducted experiments show that the proposed detector can achieve a high detection rate and a low false positive rate. Also, it outperforms Lienhart detector and tolerates wide range of illumination and blurring changes.

关键词： Feature extraction Face Detectors Histograms Pixel Training Face detection

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Hybrid Network Worm Emulation and Analysis

Hybrid Network Worm Emulation and Analysis

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International Forum on Information Technology and Applications, IFITA

作者： Kuang Xiaohui Huang MinHuan Wen Yan Xu Fei Department of Testing & Command Academy of Equipment Command슠and슠Technology Beijing China Department of Computer Science & Technology Tsinghua University Beijing China National Key Laboratory of Science and Technology on Information System Security Beijing Institute of System Engineering Beijing China

The worm experimental environment is the pivotal foundation for the worm research. Existing methods to build the environment can be classified into three categories: mathematical modeling, simulation and emulation. However, almost all of the existing methods inherently face a rigid fidelity-scalability tradeoff problem. Aming at this issue, this paper proposes a novel virtual-reality hybrid worm emulation model, which integrated the packet-level simulation and network emulation method to build worm experimental environment, for analyzing the behavior of worm propagation with respect to the changes of the network and worm characteristics. With the experiments, we analyze the impacts, induced by the network and worm characteristics on the worm propagation. The results indicate that our experimental environment can provide great support for the worm research.

关键词： Grippers Analytical models Emulation Computational modeling Bandwidth Scalability Mathematical model

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From scripts to specifications: the evolution of a flight software testing effort

From scripts to specifications: the evolution of a flight so...

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International Conference on Software engineering (ICSE)

作者： Alex Groce Klaus Havelund Margaret Smith School of Electrical Engineering and Computer Science Oregon State University Corvallis OR USA Laboratory for Reliable Software Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA Software System Engineering Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA

This paper describes the evolution of a software testing effort during a critical period for the flagship Mars science laboratory rover project at the Jet Propulsion laboratory. Formal specification for post-run analysis of log files, using a domain-specific language, LogScope, replaced scripted real-time analysis. Log analysis addresses the key problems of on-the-fly approaches and cleanly separates specification and execution. Mining the test repository suggested the inadequacy of the scripted approach, and encouraged a partly engineer-driven development. LogScope development should hold insights for others facing the tight deadlines and reactionary nature of testing for critical projects. LogScope received a JPL Mariner Award for "improving productivity and quality of the MSL Flight Software" and has been discussed as an approach for other flight missions. We note LogScope features that most contributed to ease of adoption and effectiveness. LogScope is general and can be applied to any software producing logs.

关键词： Software Telemetry Space vehicles Laboratories Libraries Semantics

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Dynamic modeling and tracking control of fuel filled space robotic system with flexible manipulators

Dynamic modeling and tracking control of fuel filled space r...

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International Symposium on systems and Control in Aerospace and Astronautics (ISSCAA)

作者： Xinxin Yang Xiong Luo Fuchun Sun Fengge Wu Huaping Liu School of Information Engineering Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education) University of Science and Technology Beijing Beijing China State Key Laboratory of Intelligent Technology and System Department of Computer Science and TechnologyTsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China

In recent years, dynamics model and control of space robot system are the hot topics in the research field. In this paper, a new dynamics model and control strategy of space robotic system with a flexible manipulator and a liquid fuel tank are investigated. Based on Lagrange equation method, the dynamics model of the space robotic system coupling with liquid sloshing, flexibility vibration and base movement is derived. The elastic deflection of the flexible manipulator is described by the assumed mode method and equivalent mechanical model is adopted instead of liquid sloshing under the environment of low-gravity. The inverse dynamics control algorithm combined with PD control method is performed to solve the trajectory tracking problem. Some simulation results are given to verify the effectiveness of the proposed method.

关键词： Mathematical model Aerospace electronics Manipulator dynamics Equations Space vehicles

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Fuzzy dynamic characteristic modeling and intelligent adaptive control for complex spacecraft

Fuzzy dynamic characteristic modeling and intelligent adapti...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Xiong Luo Song Hu Zengqi Sun Xintao Qiu School of Information Engineering Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education) University of Science and Technology Beijing Beijing China State Key Laboratory of Intelligent Technology and System Department of Computer Science and Technology Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China

Because of strong coupling, nonlinear, and time-varying characteristics, it is difficult to control complex spacecraft. By means of combining with controlled object dynamics and performance requirements, characteristic modeling and control approach is an effective way to solve this problem. Aimed at the flexible satellites described by using characteristic modeling approach, with the help of fuzzy rules, fuzzy dynamic characteristic modeling method and intelligent adaptive controller are designed to control this complex spacecraft. Meanwhile, based on the satellite system simulation platform, we validate the correctness and efficiency of the proposed modeling and control method by comparing with the simulation results of the other similar methods.

关键词： Adaptation model Laboratories Satellites Space vehicles Intelligent control Artificial intelligence Information science

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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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Theory of quenching quantum fluctuations of a laser system with a ladder-type configuration

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Physical Review A 2010年第2期81卷 023818-023818页

作者： Deshui Yu Jingbiao Chen []Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871 People’s Republic of China and State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 People’s Republic of China

The theory of a laser system with a ladder-type configuration is studied in detail based on the quantum Langevin approach. By using an external field to link the lower lasing level with another atomic level, whose decay rate is much larger, laser intensity significantly increases and the quantum-limited linewidth can be quenched. We also discuss the spectrum of fluctuations of the output field, and the result shows that the fluctuations at low frequencies can be much suppressed too. On the other hand, this quenching approach can realize a laser output between two atomic levels, whose decay rates do not satisfy the usual lasing condition that the decay rate of the lower lasing level should be larger than that of the upper lasing level. It will be very useful to realize a laser output with the wavelength we want. This quenching approach has been widely used in the absorption spectrum of the ytterbium optical lattice clock and in the laser cooling approach for calcium atoms. Here we apply it in the stimulated emission of lasers.

关键词： Ladders

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