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International Conference on BioMedical engineering and Informatics (BMEI)

作者： Bei Wang Takenao Sugi Xingyu Wang Akio Ikeda Takashi Nagamine Hiroshi Shibasaki Masatoshi Nakamura Department of Automation East China University of Science and Technology Shanghai China Department of Electrical and Electronic Engineering Saga University Saga Japan Department of Neurology Kyoto University Kyoto Japan Department of System Neuroscience Sapporo Medical University Hokkaido Japan Takeda General Hospital Kyoto Japan Research Institute of Systems Control Institute of Advanced Research and Education Saga University Saga Japan

ISBN: (纸本)9781424441327

EEG is represented to referential derivation with ear lobe reference and bipolar derivations for quantitative interpretation. When the ear lobe was activated, referential derivation with ear lobe reference was contaminated by ear lobe artifacts. In this study, the focus and extension of EEG components were estimated based on the cross spectrum of bipolar derivation. A referential derivation was constructed by choosing the electrodes out of the focus and extension area to obtain the distribution of EEG components. The constructed referential derivation can avoid the artifacts of ear lobe activation for quantitative EEG interpretation.

关键词： Electroencephalography Ear Electrodes automation Educational technology Biomedical engineering Nervous system Neuroscience Hospitals Medical control systems

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Automatic interpretation of hyperventilation-induced electroencephalogram fitting to visual inspection

Automatic interpretation of hyperventilation-induced electro...

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SICE Annual Conference

作者： Xiu Zhang Xingyu Wang Takenao Sugi Akio Ikeda Takashi Nagamine Hiroshi Shibasaki Masatoshi Nakamura Department of Automation East China University of Science and Technology Shanghai China Research Institute of Systems Control Institute of Advanced Research and Education Saga University Saga Japan Department of Electrical and Electronic Engineering Saga University Saga Japan Department of Neurology Graduate School of Medicine Kyoto University Kyoto Japan Department of System Neuroscience Sapporo Medical University Hokkaido Japan Takeda General Hospital Kyoto Japan

Quantitative analysis and detection of abnormalities for electroencephalogram (EEG) recordings during evoked activities are essential for clinical diagnosis on neurological disorders. However, the process of interpreting EEG is time consuming and requires experienced electroencephalographers (EEGers). In this study, a method of automatic EEG interpretation during hyperventilation was proposed. The purpose is to provide a quantitative interpretation of EEG which is able to conform to EEGers' visual inspection. The final integrated results of automatic interpretation were compared with EEGers' evaluation, and showed high consistence.

关键词： Inspection Electroencephalography Medical diagnostic imaging Electrodes Hospitals Clinical diagnosis Scalp Rhythm automation Educational technology

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A New Method for Piston Ring Contour Cutting Based on Linear Driving

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13th International Conference on Advanced Design and Manufacture

作者： Zhang, Yicheng Chen, Zhihua Yang, Liangcai Chen, Jihong Tang, Xiaoqi College of Mechatronic Engineering and Automation National University of Defence Technology China State Engineering Research Centre of Numerical Control System Huazhong University of Science and Technology China Reserch Institute of Numerical Control Kunming University China

ISBN: (纸本)9781848002401

It is not easy to processing piston ring contour because of its complicating shape. From view of time-domain analysis, in order to trace the curve of piston ring, servo actuator must have high speed and acceleration to complete movement of back and forth. From view of frequency -domain analysis, the order of harmonic of the piston ring contour is very high, so the control system bandwidth also should be wide enough. It's hard to satisfy these requirements for the traditional drive methods by using rotate serve and Lead screw. In this paper, a new method of direct drive by linear motor is provided, And achieve good results.

关键词： linear motor piston ring numerical control

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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...

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2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Zhu, Xiaohui Gao, Yu Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

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 60Co 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 charge

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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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2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Gao, Yu Zhang, Lei Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

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 ifthe source is turned on again.

关键词： Electrodes

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Luminescence in tracking test of polymer insulating materials

Luminescence in tracking test of polymer insulating material...

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2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Gu, L. Liu, Yong Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University 92 Weijin Road Tianjin 300072 China

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 90 and 270. 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： Light

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Grey systems for intelligent sensors and information processing

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Journal of systems engineering and Electronics 2008年第4期19卷 659-665页

作者： Chen Chunlin Dong Daoyi Chen Zonghai Wang Haibo Dept. of Control and System Engineering School of Management and Engineering Nanjing Univ. Nanjing 210093 P. R. China State Key Laboratory for Novel Software Technology Nanjing Univ. Nanjing 210093 P. R. China Dept. of Automation Univ. of Science and Technology of China Hefei 230027 P. R. China

In a measurement system, new representation methods are necessary to maintain the uncertainty and to supply more powerful ability for reasoning and transformation between numerical system and symbolic system. A grey measurement system is discussed from the point of view of intelligent sensors and incomplete information processing compared with a numerical and symbolized measurement system. The methods of grey representation and information processing are proposed for data collection and reasoning. As a case study, multi-ultrasonic sensor systems are demonstrated to verify the effectiveness of the proposed methods.

关键词： grey system grey sensors information processing

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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...

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2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Liu, Yong Wang, R.L. Key Laboratory of Power System Simulation and Control School of Electrical Engineering and Automation Tianjin University 92 Weijin Road Tianjin 300072 China Tianjin High Voltage Power Supply Company Tianjin 300250 China

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： Atmospheric pressure

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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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2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Liu, Yong Xia, Y.S. Liu, B.C. Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University 92 Weijin Road Tianjin 300072 China Tianjin Electric Power Research Institute Tianjin 300022 China

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： Biodegradable polymers

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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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