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An effective and robust pedestrians detecting algorithm & symposia

An effective and robust pedestrians detecting algorithm & sy...

引用

11th International IEEE Conference on Intelligent Transportation systems, ITSC 2008

作者： Li, Zhipeng Sun, Yun Liu, Fuqiang Shi, Wenhuan Key Laboratory of Embedded System Ministry of Education Tongji University Shanghai MN 200092 China School of Electronics and Information Engineering Tongji University Shanghai MN 200092 China Department of Control Science and Technology Shanghai JiaoTong University Shanghai MN 200240 China

ISBN: (纸本)9781424421121

In this paper, we present a pedestrian detection approach using spatial histograms of oriented gradients feature. As spatial histograms of oriented gradients consist of marginal distributions of an image over local and global patches, they can preserve shape and contour of a pedestrian simultaneously. There are two main contributions in this paper. First of all, we expand the histograms of oriented gradients features from single-size to variable-size which can capture local and global feature of pedestrian automatically. We call theses feature as the "spatial histograms of oriented gradients". Secondly, we employ histogram similarity and Fisher criterion to measure discrim- inability of features and select some discriminative features to identify the pedestrian. SVM classifier is constructed to train the selected features from target and surrounding background. The proposed algorithm is tested on some public database. Experimental results show that the proposed approach is efficient and rapid in pedestrian detection. © 2008 IEEE.

关键词： Graphic methods

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Approach on pricing electricity for large consumers based on hedonic price model

Approach on pricing electricity for large consumers based on...

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3rd International Conference on Deregulation and Restructuring and Power Technologies, DRPT 2008

作者： Ming, Zhou Xiangxin, Li Gengyin, Li IEEE Department of Electrical Engineering NCEPU NCEPU Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education

ISBN: (纸本)9787900714138

With the start of trial operation of direct purchasing electricity for large consumers in China, the method on how to price electricity is of vital theoretical and practical significance. Hedonic electricity pricing method is proposed to calculate the implicit prices of different characteristics of electricity. Based on the proposed model, the prices of electricity production cost, power quality and reliability characteristics are obtained. Comparing with the two-part pricing method, the hedonic electricity price model uses multiple electricity characteristics to make the electricity purchase price, instead of using single electric energy. Numerical examples show that the proposed approach can make purchase price more reasonable and fair. © 2008 DRPT.

关键词： Power markets

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Luminescence in tracking test of polymer insulating materials

Luminescence in tracking test of polymer insulating material...

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International Symposium on Electrical Insulating Materials

作者： B. X. Du L. Gu Yong Liu Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

ISBN: (纸本)9784886860057

This paper presents a study on effects of flammation retardant in polycarbonate (PC) on the luminescence phenomena during the tracking tests. A photo multiplier tube was employed to measure the light intensity, which is found to be well in accordance with the development of tracking failure. The results obtained reveals that light is easily emitted when the phase angle of applied voltage is around 90deg and 270deg. Weak initial light indicates the coming scintillation discharge; the continuously enhanced light is associated the scintillation discharge and the arc discharge. Each light pulse is composed of a main pulse and scores of small pulses. With the increasing flame retardant in PC, the luminescence intensity significantly decreases. The detecting technique of luminescence is sensitive to measure the light information from faint discharge pulses during the tracking tests.

关键词： Discharges Insulation life Degradation Surface discharges Luminescence Insulation Polymers

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Effect of gamma-ray irradiation on characteristics of surface charging of polyethylene

Effect of gamma-ray irradiation on characteristics of surfac...

引用

International Symposium on Electrical Insulating Materials

作者： B. X. Du Xiaohui Zhu Yu Gao Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

ISBN: (纸本)9784886860057

Polyethylene (PE) was employed as test sample which was previously irradiated in air up to 100 kGy and then up to 1000 kGy with dose rate of 10 kGy / h by using a 60 Co gamma-source. The sample surface was corona charged by applying a series of dc stresses on needle electrode which was set 6 mm above the surface. An electrostatic probe was designed to measure the surface charge density immediately after the charging process. Obtained results show dependence of total surface charge upon the applied voltage and the radiation dose. It is suggested that surface charge accumulation depends upon the density of localized surface states, which is alternated by radiation-induced degradation and cross-linking reactions of molecule structure.

关键词： Surface charging Radiation effects Surface treatment Surface discharges Polymers Probes Electrodes

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Dynamic observation on surface charge migration of polybutylene terephthalate under DC voltage

Dynamic observation on surface charge migration of polybutyl...

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International Symposium on Electrical Insulating Materials

作者： B. X. Du Yu Gao Lei Zhang Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

ISBN: (纸本)9784886860057

Polybutylene terephthalate(PBT) was employed as test sample to investigate the characteristics of surface charge migration. The experiment was carried out on sample surface under a negative dc stress between two parallel electrodes. An electrostatic probe was designed to measure the surface charge density with minimum charge resolution of 0.018 pC. Obtained results show that negative charges appear near high voltage electrode, while positive charges emerge in front of grounded electrode. The hetero charges migrate towards the opposite electrode with time, forming a junction line near the grounded electrode. The polarity of surface charge tends to be positive dominated with the lapse of decay time. It is suggested that the local field at HV electrode will be seriously enhanced if the source is turned on again.

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Stabilizability of Networked control systems via Packet-loss Dependent Output Feedback controllers

Stabilizability of Networked Control Systems via Packet-loss...

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2008 American control Conference (ACC), vol.9

作者： Junyan Yu Long Wang Mei Yu Yingmin Jia Jie Chen Intelligent Control Laboratory Center for Systems and Control College of Engineering Peking University Beijing China Department of Automation North China Electric Power University Beijing China Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing Institute of Technology Beijing China

We consider the output feedback stabilizability of networked control systems with bounded packet loss. A packet-loss dependent Lyapunov function is adopted to design packet-loss dependent stabilizing output feedback controllers by resolving some linear matrix inequalities. Moreover, two types of packet-loss processes are discussed: one is the arbitrary packet-loss process, and the other is the Markovian packet-loss process. A numerical example and some simulations are worked out to demonstrate the effectiveness of the proposed design technique.

关键词： Networked control systems Output feedback control systems Switched systems State feedback Lyapunov method Linear matrix inequalities Electrical equipment industry Industrial control Sufficient conditions

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Packet-loss dependent controller design for networked control systems via switched system approach

Packet-loss dependent controller design for networked contro...

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IEEE Conference on Decision and control

作者： Junyan Yu Long Wang Mei Yu Yingmin Jia Jie Chen Intelligent Control Laboratory Center for Systems and Control College of Engineering Peking University Beijing China Department of Automation North China Electric Power University Zhuxinzhuang Beijing China The Seventh Research Division Beihang University Beijing China Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing China

ISBN: (纸本)9781424431236

The stabilization problem of networked control systems with bounded packet loss is addressed. We model such networked control systems as a class of switched systems, and present sufficient conditions for the stabilization by using a packet-loss dependent Lyapunov function. Moreover, different from existing results, we propose the design for packet-loss dependent stabilizing controllers for two types of packet-loss processes: one is a arbitrary packet-loss process, and the other is a Markovian packet-loss process. Several numerical examples and simulations are worked out to demonstrate the effectiveness of the proposed design technique.

关键词： control systems Networked control systems Switched systems Sufficient conditions Optimal control Delay effects Communication system control Communication system traffic control Feedback control Electrical equipment industry

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Breakdown phenomenon identification of biodegradable polyethylene film under UV-irradiation environment

Breakdown phenomenon identification of biodegradable polyeth...

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International Symposium on Electrical Insulating Materials

作者： B. X. Du Yong Liu Y. S. Xia B. C. Liu Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University TJU Tianjin China Tianjin Electric Power Research Institute Tianjin China

ISBN: (纸本)9784886860057

Biodegradable polymers are increasingly expected for substitute of present insulating materials in the electrical and electronic devices. However, their electrical properties are not systematically confirmed and need further investigation. In this paper, biodegradable polyethylene (BDPE) films are employed as the specimens and high density polyethylene (HDPE) films are as the reference. The breakdown endurance of BDPE film is examined using bias DC voltage under UV-irradiation environments. The images of breakdown craters are captured through applying a monocular-video-zoom microscope. Both breakdown area and box dimension of breakdown craters are obtained by an image-pattern-identification technique. The results reveal that for both BDPE and HDPE films, the breakdown voltage, breakdown area and box dimension all decrease with the increase of UV-irradiation level. Based on comparison of the results, it shows that under UV-irradiation environment, breakdown endurance of BDPE film is better than that of HDPE film.

关键词： Electric breakdown Plastics Films Electrodes Materials Chemicals Polyethylene

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Effects of corona discharge on surface deterioration of silicone rubber insulator under reduced pressures

Effects of corona discharge on surface deterioration of sili...

引用

International Symposium on Electrical Insulating Materials

作者： B. X. Du Yong Liu R. L. Wang Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University TJU Tianjin China Tianjin High Voltage Power Supply Company Tianjin China

ISBN: (纸本)9784886860057

With the broad application of silicone rubber (SIR) insulator in high-altitude regions, corona degradation is one of the inevitable electrical degradation caused by electric stress due to the organic properties of SIR. Although this phenomenon is investigated at atmospheric pressure, there is little investigation at low pressures. It is urgent to systematically investigate effects of low pressure on the corona degradation for the reliable application. Experiments were carried out in a decompression chamber and the ambient pressure was reduced by a rotary pump from the atmospheric pressure to 40 kPa. The specimens were exposed to corona discharges at low pressures for different lapse time. The surface static contact angles on the insulator were measured to reveal the hydrophobicity changes. The currents during corona discharges at different low pressures were measured to confirm the corona degradation with variation of the pressures. The results obtained showed that the intensity of corona discharge increased with reducing the ambient pressure, which accelerated the process of corona degradation.

关键词： Corona Discharges Degradation Insulators Rubber Electrodes Aging

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A VSC-HVDC fuzzy controller to damp oscillation of AC/DC power system

A VSC-HVDC fuzzy controller to damp oscillation of AC/DC pow...

引用

IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Chunye Li Sheng Li Fuchun Han Jingfu Shang Ermin Qiao College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China China Electrical Power Research Institute China

The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. An auxiliary fuzzy logic controller designed in Matlab for the voltage source converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/DC system is designed to enhance stability by increasing the deceleration energy of oscillation. Simulation results on the IEEE 4-generator AC/DC power systems have shown that the controller can enhance the dynamic stability of interconnected power systems effectively and is robust to the variation of system operating conditions and oscillation modes.

关键词： Fuzzy control Fuzzy systems control systems Power systems Power system stability Converters Power conversion Power system simulation Power system interconnection Power system dynamics

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