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인체 통신에 따른 인체 주변에서의 전기장 분포 계산 및 전송 손실 연구
주영준(Young-Jun Ju),김윤명(Youn-Myoung Gimm) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.2
인체 통신이란 사람의 몸통이나 피부를 전송 매질로 하여 데이터를 송수신하는 통신 방식을 의미한다. 본 논문에서는 인체 피부 표면에 닿아 있는 자유 공간을 전송 매체로 하여 데이터를 전달하는 전송 방식에 대하여, 10~30 MHz 주파수 범위에서 5 MHz 간격으로 5개의 주파수에 대하여 송수신부 사이의 전기장 분포에 대하여 수치 해석하였다. 채널 손실 계산은 총 29종의 조직으로 구성되어 있는 한국형 남성 표준 인체 모델에 상용의 툴을 사용하여 실행하였다. 계산 주파수에 따른 인체 조직의 도전율과 비유전율을 해석 파라미터로 입력하여 송수신부로 간주되는 손등 위에서 전기장 분포를 계산하였다. 손등에 부착된 송신기에 의한 전자파比흡수율(SAR: Specific Absorbtion Rate) 값을 계산한 후, 국제비전리복사방호위원회(ICNIRP: International Commission on Non-Ionizing Radiation Protection) 인체 보호 기준과 비교하였다. 또한, 수치 해석으로 구한 전기장을 선(線)적분하여 인접한 극판들 사이의 전압들을 계산하였고, 송신부와 수신부의 전압의 비(比)를 채널 손실로 정의하였다. 수치 해석 결과, 10~30 MHz 주파수 대역에서 채널 손실의 범위는 약 (75 ± 1) dB로 주파수에 따른 채널 손실의 변화가 크지 않았다. Human body communication means transmitting and receiving data through human body medium or through free space along with the human body skin. Electric field distribution around the human body between the transmitter and the receiver were calculated at five different frequencies with 5 MHz interval between 10 MHz and 30 MHz. Commercial electromagnetic simulation tool was used for the calculation of E-field distributions applying the Korean standard male model including 29 different kinds of human tissues. After calculating specific absorption rate(SAR) values on back of the hand, it was compared with International Commission on Non-Ionizing Radiation Protection(ICNIRP) human protection guideline. While conductivities(σ) and relative permittivities(εr) of the human tissues for each frequency were input as the analyzing parameters, electric field intensities near both hands were integrated along the integral line between the nearby electrodes for the calculation of the transmitting and receiving voltages whose ratio was defined as channel loss. The calculated channel losses were about (75 ± 1) dB and showed nearly flat response all through the evaluated frequencies.
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김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun),유재성(Yoo Jea-Seong),구본철(Koo Bon-Chul) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
High speed train system consumes much electric power during running, and generate much EMI (electromagnetic interference) by arc between the pantograph and the trolley line. In this paper, EMI was measured following EN50121-2, ‘Railway applications. ? Electromagnetic compatibility. (Emission of the whole railway system to the outside world)’, from the running high-speed railway (KTX) at 300 km/h speed. Measured results exceed the limit values of EN50121-2 in low frequency band (9 ㎑ ~ 150 ㎑), but they did not exceed the limit values in other higher frequency band (150 ㎑ ~ 1 ㎓).
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김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
High speed train system generates much EMI (electromagnetic interference) by arc between the pantograph and the trolley line during the running time. EMI from the tilted EMU train system which is similar to HEMU-400X system for 400 km/h speed and with the distributed engines was measured following EN50121-2, 'Railway applications. - Electromagnetic compatibility (Emission of the whole railway system to the outside world)'. Measured EMI values exceed the limiting values of EN50121-2 in high frequency band (30 ㎒ - 1,000 ㎒), but exceeding frequencies were identified that they are used for mobile communications. Measured EMI values did not exceed the limiting values in other low frequency band between 9 ㎑ and 30 ㎒.
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동력 분산형 고속전철의 전자파 Source 및 Victim에 관한 연구
김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun),구은희(Koo Eun-Hee),구본철(Koo Bon-Chul),유재성(Yoo Jae-Seong) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The high-speed EMU is assembled with distributed EMI sources. Therefore, it contains more electromagnetic sources nearby the distributed victims than the existing concentrated traction system. The electromagnetic sources and victims are identified in this research, and the methodology how to handle EMI/EMS/EMC of the high-speed EMU will be developed for safer operation. It includes measurement method, safety standards of control units and others, and performance evaluations of the firstly developed trial products for the EMU. Also influences by modern telecommunication equipments and effect of PLD(power line disturbance) are to be surveyed in this research.
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무선통신서비스 주파수대역에서의 고속전철 시스템의 RFI 내성기준 및 측정방법 연구
김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Wireless telecommunication frequency band becomes wider with the development of modern telecommunication technology, and highly integrated semiconductors are applied more at high speed tain system. RFI susceptibilities of the integrated power semiconductors in high speed train system influence much on the system safety. RFI susceptibility standards and measurement methods in high speed train system at wireless telecommunication frequency band is surveyed in this research.
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