• Title/Summary/Keyword: electromagnetic device

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Estimation of MCG parameters for the diagnosis of heart diseases (심질환 진단을 위한 심자도 파라메터의 추출)

  • Jeon, Chang-Ik;Huh, Young;Kim, Ki-Uk;Han, Byung-Hee;Jin, Seung-Oh;Chang, Won-Suk;Lee, Hyun-Ho
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.549-552
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    • 2003
  • The electrical current generated by heart creates not only electric potential but also a magnetic field. We have observed electrophysiological phenomena of the heart by measuring tangential components of magnetocardiogram(MCG) using 61 channel superconducting quantum interference device(SQUD) system. In this paper, we developed a new analysis method, which is based on the theory of electromagnetic field. We show some differences of the current direction between the normal MCG and the abnormal(ischemic heart disease) MCG.

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A Study on Electromagnetic Interference of Electric Vehicles with Variations of Charging Device Inlet Location (전기자동차 충전구 위치에 따른 전자파 방사특성에 관한 연구)

  • Gwon, Sunmin;Woo, Hyungu
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.6
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    • pp.694-701
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    • 2016
  • According to revolutionary developments in automobile technologies, eco-friendly advanced vehicles (hybrid vehicle, hydrogen fuel-cell vehicle, electric vehicle, etc.) are rapidly increasing. The electromagnetic compatibility is getting more important for development of a vehicle because those advanced vehicles are driven by electric energy and equipped with more electric systems. In general, electromagnetic compatibility tests consist of an electromagnetic interference(EMI) test and an electromagnetic susceptibility(EMS) test. EMI test of the electric vehicles are needed not only in driving mode but also in charging mode because they must be recharged by much electric energy for driving. Depending on vehicle manufacturers, the charging device type and the location of charging device inlet in electric vehicles are various. In this paper, in order to investigate EMI of electric vehicles in charging mode in consideration of the direction of measuring antenna and the location of charging device inlet, a series of electromagnetic emission tests are conducted using three electric vehicles (neighborhood electric vehicle, electric vehicle and electric vehicle-bus). The test results show that electromagnetic emission measurements in charging mode are dependent on the direction of measuring antenna and the location of charging device inlet.

Current Characteristics of CMOS device Broken by Intentional High Power Electromagnetic Wave (의도 고출력 전자파에 의해 오동작 되는 CMOS소자의 전류특성)

  • Hwang, Sun-Mook;Hong, Joo-Il;Han, Seung-Mook;Park, Shin-Woo;Huh, Chang-Su
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1516-1517
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    • 2007
  • This paper investigated the breakdown effect of the CMOS device by impact of high power electromagnetic wave. The experiments employed a waveguide to study the current characteristics of CMOS device broken by high power electromagnetic wave. The CMOS device were composed of a LED drive circuit for visual discernment. Also CMOS device broken by high power electromagnetic wave was observed by power current. The CMOS device were broke by high power electromagnetic wave at about 10 kV/m and when power current is 75 mA. Based on the result, CMOS devices should show plan to protect the CMOS devices by high power electromagnetic wave. And the database from this experiment should provide the basis for future investigation.

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A Non-contact Two-Dimensional Position Sensing Device Using Electromagnetic Induction (전자기 유도 방식을 이용한 비접촉식 2차원 위치 센서)

  • Ryu, Young-Kee;Koh, Kuk-Won;Kim, Hak-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.11
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    • pp.1159-1163
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    • 2012
  • In this paper, we would like to introduce two dimensional non-contact position sensor by using an electromagnetic induction based coil system and an algorithm to estimate the position of pointer. The sensor which will introduce in this paper is composed of a pointer including LC resonant circuit and a sensor board to detect the electromagnetic signal from the pointer. Because of the simplicity shape of the line antenna, low cost and free form curved shape of the sensor device is possible. In this research, we proposed a new two dimensional non-contact type electromagnetic sensor system and realized the proposed sensor device. From the experiments, the proposed device can be employed for the two dimensional position sensor.

A Study on the Coordinate Estimate Algorithm of the Electromagnetic Induction Based Wired Tablet Device (전자기 유도 방식을 이용한 유선 태블릿의 좌표 측정 알고리즘 연구)

  • Hong, Dong-Goo;Ryu, Young-Kee;Oh, Chun-Suk
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.9 no.4
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    • pp.153-159
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    • 2009
  • In this paper, we deal with the coordinate estimate algorithm of the wired tablet device. In order to got the position of the electric pen on the tablet, electromagnetic induction effect is used. Most electric tablets have used the electromagnetic induction effect. Tracking the position of the pen on a tablet that is directly related with the performance of the device is very important. In this research, a new real time coordinate estimate algorithm is introduced. To estimate the position of the pen, the electromagnetic induced signals og the wired tablet are used.

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Mechanical performance analysis of an electromagnetic friction pendulum system based on Maxwell's principle

  • Mao Weikang;Li Xiaodong;Chen Enliang
    • Earthquakes and Structures
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    • v.27 no.2
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    • pp.143-154
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    • 2024
  • Friction pendulums typically suffer from poor uplift-restraining. To improve the uplift-restraining and enhance the energy dissipation capacity, this article proposed a composite isolation device based on electromagnetic forces. The device was constructed based on a remote control system to achieve semi-active control of the composite isolation device. This article introduces the theory and design of an electromagnetic chuck-friction pendulum system (ECFPS) and derives the theoretical equation for the ECFPS based on Maxwell's electromagnetic attraction equation to construct the proposed model. By conducting 1:3 scale tests on the electromagnetic device, the gaps between the practical, theoretical, and simulation results were analyzed, and the accuracy and effectiveness of the theoretical equation for the ECFPS were investigated. The hysteresis and uplift-restraining performance of ECFPS were analyzed by adjusting the displacement amplitude, vertical load, and input current of the simulation model. The data obtained from the scale test were consistent with the theoretical and simulated data. Notably, the hysteresis area of the ECFPS was 35.11% larger than that of a conventional friction pendulum. Lastly, a six-story planar frame structure was established through SAP2000 for a time history analysis. The isolation performances of ECFPS and FPS were compared. The results revealed that, under horizontal seismic action, the horizontal seismic response of the bottom layer of the ECFPS isolation structure is greater than that of the FPS, the horizontal vibration response of the top layer of the ECFPS isolation structure is smaller than that of the FPS, and the axial force at the bottom of the columns of the ECFPS isolation structure is smaller than that of the FPS isolation structure. Therefore, the reliable uplift-restraining performance is facilitated by the electromagnetic force generated by the device.

A Study on the induced Current of Electro Explosive Device Bridge Wire under Electromagnetic Field (전자파환경에서 EED에 유기되는 전류에 관한 연구)

  • 김응조
    • Journal of the Korea Institute of Military Science and Technology
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    • v.5 no.2
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    • pp.116-122
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    • 2002
  • Electro Explosive Devices can be susceptible to electromagnetic interference. When these components are exposed to external electromagnetic fields, it may cause to induce sufficient current to generate enough heat for an inadvertent detonation. It is almost impossible to monitor the event of firing throughout the electromagnetic environment test. The survivability of EED for hazards of electromagnetic radiation is investigated. A fiber optic sensor is installed near the bridge wire after removing explosive material in order to measure the induced current on the bridge wire. The length of lead-wire of the EED fabricated is around 15 cm.

Full-Wave Analysis of Microwave Amplifiers with Nonlinear Device by the FDTD Algorithm

  • Kang, Hee-Jin;Park, Jae-Hoon
    • Journal of electromagnetic engineering and science
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    • v.2 no.2
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    • pp.81-86
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    • 2002
  • This paper presents the full wave analysis of microwave circuits with nonlinear device using the finite difference time domain method. The equivalent current source is used to model nonlinear device and all the electric field components at the nonlinear device are updated by FDTD algorithm. The currents and voltages of nonlinear device are calculated by the state equations and iteration method. To validate the proposed method, the S-parameters of NEC NE72089 MESFET in various conditions are analyzed and the results are compared with those of the ADS. The proposed method is applied to the analysis of a microwave amplifier, which includes NEC NE72089 MESFET. The analysis results obtained by the present method show good agreement with those of the ADS.

EMI (Electromagnetic Interference) Shielding Properties of Barium-Based Ferrite Thin Films Prepared by Spin Spray Method (스핀 스프레이 방식으로 제조된 바륨계 페라이트 박막의 EMI (Electromagnetic Interference) 차폐 특성)

  • Hye Ryeong Oh;Yeon-Ju Park;Woo-Sung Lee;Chan-Sei Yoo;Myong-Jae Yoo;Intae Seo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.37 no.2
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    • pp.195-201
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    • 2024
  • The low-temperature deposition of BaNi(2-x)CoxFe16O27 thin films with a Ba hexaferrite structure for electromagnetic shielding was studied. The BaNi(2-x)CoxFe16O27 thin films produced through the spin spray process were suitable for thin film deposition on a flexible substrate because it crystallized well at low temperature below 90℃. The change in shielding characteristics depending on the Co content of the BaNi(2-x)CoxFe16O27 thin film was investigated, and excellent shielding characteristics with S21 of -1 dB were obtained in a wide frequency range of 26~40 GHz when the Co content was 0.4 or more. The purpose of this study is to analyze changes in shielding properties caused by change in Co content in relation to phase changes in BaNi(2-x)CoxFe16O27 and obtain basic data for developing excellent flexible electromagnetic wave shielding materials.

EBG Metamaterial Ground Plane for Mitigation of Multipath Signals in GNSS Antenna

  • Boyko, Sergey N.;Kukharenko, Alexander S.;Yaskin, Yury S.
    • Journal of electromagnetic engineering and science
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    • v.15 no.4
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    • pp.199-205
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    • 2015
  • An electromagnetic band gap (EBG) metamaterial construction is presented. A construction of a multipath mitigating ground plane, based on the EBG metamaterial is described. A method of the ground plane application and installation, which provides the multipath mitigating without spoiling antenna element phase center stability, is suggested and explained. A designed construction of GNSS antenna module, which contains the multipath mitigating ground plane, made from the presented EBG metamaterial and installed in the described way is shown and parameters of the antenna module are provided.