• Title/Summary/Keyword: 인체 전자기장 신호

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A study on the hardware development for handshake recognition using electric potential signal form human body (인체전자기장 신호를 응용하여 손동작 인식을 위한 하드웨어 구현에 대한 연구)

  • Cheon, Woo Young;Lee, Suk Hyun;Kim, Young Chul
    • Smart Media Journal
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    • v.5 no.3
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    • pp.49-53
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    • 2016
  • Related researches are progressing that method of non-contact method using the electromagnetic field on the human body by detecting the motion recognition signal is the limitations of time and space, so less than the existing systems. In this paper, we designed the circuit system that can implement the hardware that can detect the electric field signal of the human body non-contact method to increase the recognition rate to screen this digital waveform. The PCB design Used to automatically increase of composition of the circuit and the linkage of the comparator digital waveform with circuit simulation of the system. At same time for evaluate the characteristics of the whole circuit system.

Vital Sign Sensor Based on Second Harmonic Frequency Drift of Oscillator (발진기의 2채배 고조파 주파수 천이를 이용한 생체신호 측정센서)

  • Ku, Ki-Young;Hong, Yunseog;Lee, Hee-Jo;Yun, Gi-Ho;Yook, Jong-Gwan;Kim, Kang-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.3
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    • pp.299-306
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    • 2016
  • In this paper, a vital sign sensor based on impedance variation of resonator is proposed to detect the respiration and heartbeat signals within near-field range as a function of the separation distance between resonator and subject. The sensor consists of an oscillator with a built-in planar type patch resonator, a diplexer for only pass the second harmonic frequency, amplifier, SAW filter, and RF detector. The cardiac activity of a subject such as respiration and heartbeat causes the variation of the oscillation frequency corresponding impedance variation of the resonator within near-field range. The combination of the second harmonic oscillation frequency deviation and the superior skirt frequency of the SAW filter enables the proposed sensor to extend twice detection range. The experimental results reveal that the proposed sensor placed 40 mm away from a subject can reliably detect respiration and heartbeat signals.

A Study on Electromagnetic Field Emission and Its Effect on Electromagnetic Environment (전자파 환경의 전자기장 방출과 그 영향에 대한 고찰)

  • Yoon, Kwang-Yeol
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.3
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    • pp.613-618
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    • 2019
  • EMF (Electromagnetic Field) is a valuable resource for living in a knowledge-based information society. The EMF is used in home appliances that make our lives easy and convenient, and in telecommunication devices such as mobile phones, personal computers, medical devices and broadcasting towers. However, the biological hazards associated with EMF exposure are also increasing in signal from telecommunication devices. Studies of the effects of EMF exposure on humans have been conducted for a long time, but it has not yet been demonstrated whether the EMF effect is harmful. In this paper, we examine the electromagnetic field emitted from various electronic devices around living and its effect.

Implementation of EPS Motion Signal Detection and Classification system Based on LabVIEW (LabVIEW 기반 EPS 동작신호 검출 및 분석 시스템 구현)

  • Cheon, Woo Young;Lee, Suk Hyun;Kim, Young Chul
    • Smart Media Journal
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    • v.5 no.3
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    • pp.25-29
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    • 2016
  • This paper presents research for non-contact gesture recognition system using EPS(Electronic Potential Sensor) for measuring the human body of electromagnetic fields. It implemented a signal acquisition and signal processing system for designing a system suitable for motion recognition using the data coming from the sensors. we transform AC-type data into DC-type data by applying a 10Hz LPF considering H/W sampling rate. in addition, we extract 2-dimensional movement information by taking difference value between two cross-diagonal deployed sensor.

MRI Enhancement using Perovskite Material for B1 Field Control at 7T (7T MRI에서 B1 필드 조정을 위해 페로브스카이트 재료를 이용한 자기공명영상 향상)

  • Kim, Yong-Tae;Kim, Joo-Yeon;Baek, Hyeon-Man
    • Journal of the Korean Society of Radiology
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    • v.15 no.4
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    • pp.565-573
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    • 2021
  • The spatial distribution of electromagnetic fields in the human body can be adjusted by using high dielectric materials. This method has a complementary compared to other methods. However, it can be used as a powerful dielectric shimming tool in certain applications. It can be manufactured in a geometrically free shape and a pad manufactured according to the purpose can be applied without any change of the system. Especially in ultrahigh magnetic field (UHF) MRI, the clinical high dielectric pad used to increase the intensity of the transmit (B1+) and receive (B1-) fields, which has low sensitivity due to the high operating frequency, has great potential. In addition, there are few studies applied to UHF MRI. Therefore, in this study, a high dielectric material pad made of calcium titanate suspension was developed in the laboratory. And the signal increase of clinically useful images was confirmed in various protocols of UHF 7T MRI.