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9th IEEE International Symposium on Wireless, Mobile and Multimedia Networks, WoWMoM 2008

作者： Liu, Liang Zhang, Xi Huadong, Ma. Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX 77843 United States Beijing Key Lab. of Intelligent Telecomm Software and Multimedia Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781424421008

Target tracking and localization are important applications in camera sensor networks. Although coverage is a very important research topic in wireless sensor networks, and the coverage problem for target detection has been intensively studied, few considers the coverage problem from the perspective of target localization. In this paper, we investigate the coverage problem from the perspective of target localization for camera sensor networks. We first propose a novel localization-oriented sensing model based on the perspective projection of camera. Then, we propose a new notion of Localization-oriented coverage (L-coverage for short). We assume that all camera sensors make the measurements independent of other in the field, and these camera sensors can cooperate to make an accurate estimation for the location of the target. In addition, the relationships among L-coverage, 2-coverage, and the density of camera sensors are also discussed in this paper. The obtained results show that our model can be effectively deployed in many practical scenarios. © 2008 IEEE.

关键词： Target tracking

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Direct preparation of TiFe alloy by electrolytic reduction from TiO2 and Fe2O3

Beijing Keji Daxue Xuebao/Journal of University of Science a...

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Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing 2008年第6期30卷 620-624页

作者： Guo, Xiaoling Guo, Zhancheng Wang, Zhi National Key Laboratory of Complex Multiphase Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China Graduate University Chinese Academy of Sciences Beijing 100049 China Key Lab. of the Ministry of Education of China for Ecology and Circular Metallurgy University of Science and Technology Beijing Beijing 100083 China

TiFe alloy was prepared directly by electrolytic reduction from the mixture of TiO2 and Fe2O3 in molten CaCl2 at 1173 K and 3.1 V. The reduced product was TiFe with an oxygen content of 0.43% in mass fraction after electrolyzing for 10 h. The whole electrolysis process, roughly, includes two periods: The reduction of Fe element and the forming of TiFe. In the initial stage of electrolysis, Fe element is reduced first prior to titanium and CaTiO3 is formed. Then the external cathode is reduced to TiFe. Meanwhile, the cathode is layered: The external loose layer mainly contains TiFe and the inner layer, which is much harder and more compact, chiefly consists of Fe and CaTiO3. Electrochemical behavior test shows that the discharge capacity of TiFe alloy produced by electrolysis without activation is about 33 mAhg-1 and TiFe alloy by this performance is better than those prepared by other methods.

关键词： Chlorine compounds

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Cycle slipping phenomenon in synchronous control systems

Cycle slipping phenomenon in synchronous control systems

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2007 American Control Conference, ACC

作者： Ying, Yang Lin, Huang State Key Lab. for Turbulence and Complex Systems Department of Mechanics and Engineering Science Peking University Beijing 100871 China

ISBN: (纸本)1424409888

Cycle slipping is a characteristically nonlinear phenomenon in synchronous control systems. Slipping a cycle means that the phase error is increased to such an extent that the generator to be synchronized slips one complete cycle with respect to the input phase. In this paper, linear matrix inequality (LMI) conditions for the existence of cycle slipping in a synchronous control system is proposed and the estimation of the number of cycles which slips a solution of the system is obtained by solving a quasi-convex optimization problem of LMI. Applications to phase locked loops demonstrate the validity of the proposed approach. © 2007 IEEE.

关键词： Linear matrix inequalities

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A class of uncertain pendulum-like systems with several nonlinearities

A class of uncertain pendulum-like systems with several nonl...

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2007 American Control Conference, ACC

作者： Lu, Pingli Yang, Ying Huang, Lin Department of Mechanics and Aerospace Technology College of Engineering Peking University Beijing 100871 China State Key Lab. for Turbulence and Complex Systems Department of Mechanics and Aerospace Technology Peking University Beijing 100871 China

ISBN: (纸本)1424409888

This paper considers the existence of cycles of the second kind in uncertain pendulum-like systems with several nonlinearities. Based on Kalman-Yakubovich-Popov (KYP) lemma, which establishes the equivalence between frequency domain inequalities(FDIs) and linear matrix inequalities(LMIs), LMI conditions guaranteeing the existence of cycles of the second kind for such nonlinear systems under parameter uncertainties are established. In virtue of the results, an interesting conclusion is reached that synthesis problem ensuring the existence of cycles of the second kind for such uncertain nonlinear system can be converted into synthesis problem for a system without uncertainties. A practical example about synchronous machine demonstrates the validity of the present approach. © 2007 IEEE.

关键词： Linear matrix inequalities

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A new method of illumination invariant face recognition

A new method of illumination invariant face recognition

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2nd International Conference on Innovative Computing, Information and Control, ICICIC 2007

作者： Wang, Juanjuan Wu, Lifang He, Xiaoguang Tian, Jie School of Electronic Information and Control Engineering Beijing University of Technology Beijing 100022 China Key Lab. of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences P.O.Box 2728 Beijing 100080 China

ISBN: (纸本)0769528821

In this paper the Morphological Quotient Image (MQI) based on close and open operation are compared, and the more effective operation is chosen. Furthermore, the influence of template size to recognition rate is studied. For different size of face images, the optimal template is obtained by experiment using Yale Face Database B. The optimal template is tested using CMU-PIE database and the experimental result is encouraging. © 2007 IEEE.

关键词： Face recognition

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A New Method of Illumination Invariant Face Recognition

A New Method of Illumination Invariant Face Recognition

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International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Juanjuan Wang Lifang Wu Xiaoguang He Jie Tian School of Electronic Information and control Engineering Beijing University of Technology Beijing China Key Lab. of Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China

In this paper the Morphological Quotient Image (MQI) based on close and open operation are compared, and the more effective operation is chosen. Furthermore, the influence of template size to recognition rate is studied. For different size of face images, the optimal template is obtained by experiment using Yale face database B. The optimal template is tested using CMU-PIE database and the experimental result is encouraging.

关键词： Lighting Face recognition Image databases Testing Degradation Reflectivity Light sources Equations Spatial databases Helium

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Cycle slipping in discrete phase-controlled system

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25th Chinese Control Conference, CCC 2006

作者： Pingli, Lu Ying, Yang Lin, Huang State Key Lab. for Turbulence and Complex Systems Department of Mechanics and Engineering Science Peking University Beijing 100871 China

ISBN: (纸本)7810778021

This paper considers cycle slipping of discrete phase-controlled system with periodic nonlinearity. The number of slipped cycles is an important characteristic of such nonlinear system. Based on Yakubovich-Kalman Lemma which establishes the equivalence between frequency domain inequalities(FDIs) and linear matrix inequalities(LMIs), the conditions of estimating the number of slipped cycles are derived. Then dynamic output feedback controller is designed to guarantee the nonexistence of cycle slipping. As a result, the transient performance of discrete phase-controlled system is improved. A concrete application to impulse phase-locked loop (PLL) shows the applicability and validity of the proposed approach.

关键词： Phase control

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A hybrid algorithm of facial feature point location based on improved MR-ASM and AAM

A hybrid algorithm of facial feature point location based on...

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8th International Conference on Signal Processing, ICSP 2006

作者： Sicong, Zhang Lifang, Wu Xiaoguang, He Jie, Tian School of Electronic Information and Control Engineering Beijing University of Technology Beijing 100022 China Key Lab. of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences P.O.Box 2728 Beijing 100080 China

ISBN: (纸本)0780397371

Accurate and robust location of feature point is a difficult and complicated issue in face recognition. This paper proposes a facial feature point location algorithm based on improved Multi-Resolution- Active Shape Models (MR-ASM) and Active Appearance Models (AAM). There are three main achievements of our algorithm: 1, we unify MR-ASM and AAM together to improve facial feature point location. 2, AAM is improved so that it has the same implementation framework as ASM. 3, the MR-ASM is adjusted to figure out more robust parameters. Experimental results prove that our algorithm is more accurate than traditional MR-ASM. © 2006 IEEE.

关键词： Face recognition

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Hybrid earliest deadline first /preemption threshold scheduling for real-time systems

Hybrid earliest deadline first /preemption threshold schedul...

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Proceedings of 2004 International Conference on Machine Learning and Cybernetics

作者： He, Dong-Zhi Wang, Fei-Yue Li, Wei Zhang, Xiang-Wen Key Lab. Complex Syst./Intell. Sci. Institute of Automation Chinese Academy of Sciences Beijing 100080 China Department of Systems Engineering University of Arizona Tucson AZ 85721 United States

ISBN: (纸本)0780384032

As embedded systems geting increasingly complex, preemption overheads become a serious load problem for many microchip-based application specific systems, and sometimes may even jeopardize the system schedulab.lity. This paper presents a dynamic preemption threshold scheduling (DPT) that integrates preemption threshold scheduling into the earliest deadline first The DPT scheduling can effectively reduce context switching by threads assignment and changing task dynamic preemption threshold at runtime. Meanwhile, because the algorithm is based on dynamic scheduling, it can achieve higher processor utilization with relatively low costs in preemption switching and memory requirements. The DPT scheduling can also perfectly schedule a mixed task set with preemptive and non-preemptive tasks, and subsumes both as special cases.

关键词： Real time systems

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Approaches to H.264-based stereoscopic video coding

Approaches to H.264-based stereoscopic video coding

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Proceedings - Third International Conference on Image and Graphics

作者： Li, Shiping Yu, Mei Jiang, Gangyi Choi, Tae-Young Kim, Yong-Deak Institute of Circuits and Systems Ningbo University Ningbo 315211 Zhejiang China State Key Lab. Novel Software T. Nanjing University 210093 Nanjing China Division of Electronics Engineering Ajou University Suwon 442-749 Korea Republic of

ISBN: (纸本)0769522440

H.264 is an advanced video compression standard, absorbing the advantages of the previous standards. In this paper, block-based stereoscopic video coding is studied, and some schemes of using H.264 are discussed. The stereoscopic video coding methods based on H.264 and based on H.263+ are also compared by the experiments, experimental results show that the former is more effective than the latter in compression efficiency and image quality, and the H.264-based stereoscopic video coding scheme with temporal scalab.lity is quite effective. © 2004 IEEE.

关键词： Image coding

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