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Automatic Interpretation of Dominant Rhythm in Awake Electroencephalogram Based on Coherence and Phase Analysis for Bipolar Derivation

Automatic Interpretation of Dominant Rhythm in Awake Electro...

引用

International Conference on BioMedical engineering and Informatics (BMEI)

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

ISBN: (纸本)9781424441327

Automatic electroencephalogram (EEG) interpretation based on referential derivation is easily interfered by ear lobe activation. In order to improve the quantitative EEG interpretation of dominant rhythm, bipolar derivation was proposed in this study. Coherence and phase obtained from cross spectrum analysis were used to determine the focus of dominant rhythm. Existence, peak frequency, amplitude and asymmetry of dominant rhythm were interpreted within the frequency band from 4 to 13Hz. The automatic interpretation of dominant rhythm based on bipolar derivation was compared with the visual inspection of electroencephalographer (EEGer) and showed good consistence.

关键词： Rhythm Auditory system Signal synthesis Testing Speech processing Deafness Aging Signal analysis Biomedical engineering Instruments

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Bipolar EEG Analysis Based on Cross Spectrum: Focal Detection of Slowing Wave for Automatic EEG Interpretation

Bipolar EEG Analysis Based on Cross Spectrum: Focal Detectio...

引用

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...

引用

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

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

引用

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...

引用

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...

引用

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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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

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...

引用

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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