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오재근(Jae-geun Oh),이제윤(Jaeyun Lee),최범규(Bumkyoo Choi),김주곤(JooGon Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This research focused on the battery-less real time tire pressure monitoring system by the use of a SAW device and micromachined pressure sensor. A SAW device acts as a wireless transponder without power sources such as battery, wired DC power, etc. Research results represent the optimistic feasibilities of intelligent tire sensor which should be operated without battery. For developing a SAW based passive radio tire pressure sensor and a monitoring system, we developed sensor systems such as a micro-machined touch-down mode capacitive pressure, low insertion loss SAW transponder and a high gain(over 77㏈) single heterodyne coherent dynamic rf. reader system with high speed(100MIPS) MCU based ECU, etc. The outstanding research results of developed passive radio sensor and reader system were the detection range about 3 meters without violation of international regulation, which is below 10㎽ transmitting power level at the frequency of 433㎒ ISM(Industrial, scientific and medical) band, and the adequate micromachined capacitive sensor's capacitance change if using touch-mode method. The normal capacitive pressure sensor's FOM(Figure of merit) is 1 or less. However, developed touch-mode capacitive pressure sensor's FOM was 4.This result shows large SNR affecting long range detection capability.
오재근(Jae-Geun Oh),김용진(Jae-Geun Kim) 한국의사학회 2008 한국의사학회지 Vol.21 No.1
The concept of health has existed through the history of mankind; the recognition and adaptation of such concept has transformed over time with the development of culture throughout the age of humans. These concept wasn’t absent in the content East Asian Medicines, which is represented by Huangdi’s Internal Classic. However, due to imperialism and colonial polocies in the past, biomedical concepts of health has been accepted with force. The concept of “health” in pathological medicines of biomedicine refers to the of anatomical and biological completeness of the body system. In East Asia, Korean especially, a number of concepts regarding these subjects has been informed by Japanese physicians, such as Hukujawa Yukichi. Understanding the idea of body in the angle of philosophy, history, and medicine in the cultural area of East Asia is necessary.
도로 환경 모니터링을 위한 차량 유도풍 에너지 변환 시스템
이제윤(Lee, Jae-yun),민철기(Min, Chul-ki),한의석(Han, Eui-seok),한상주(Han, Sang-ju),오재근(Oh, Jae-geun) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
도로 환경 모니터링을 위한 센서 노드의 전력원으로 유도풍을 이용한 압전에너지 하베스팅 기술은 기존 재생 에너지의 설치 및 작동 조건에 영향을 받지 않고, 도로상에 주오염원인 자동차에서 발생되는 폐에너지를 활용하는 친환경적 에너지 순환시스템을 구현하는 핵심 요소이다. 차량 유도풍에 의해 발생되는 풍압으로 도로 상의 구조물에 진동을 유발한다. 이 때 발생한 진동 에너지는 압전체를 통해 전기 에너지로 변환, 저장할 수 있다. 이렇게 저장된 에너지는 센서의 구동과 무선 데이터 송수신을 위한 센서 노드의 전력원으로 사용함으로써 별도의 전력원이 필요없게 된다. 본 연구에서는 60km/h로 주행하는 한 대의 차량에 의해 2.7m/s의 유도풍이 발생하여 0.6g로 도로 상의 구조물에 에너지를 전달하게 된다. 전달된 에너지가 압전체를 통해 15uJ 전기에너지로 저장된다.
철도차량 무선 센서 모니터링 시스템 개발을 위한 기초연구
김재훈(Kim Jaehoon),오재근(Oh Jae-Geun),박준서(Park Jun-Seo),김형진(Kim Hyung-Jin) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
We did the blooth module test as a pre-test of wireless sensor monitoring system, which for the improving of on-condition maintenance reliability, on the train. In this test, we examined the communication environment of wireless sensor monitoring system by the acceleration date and frequency date in the real train structure during the operation. Also based on this results, we did the experimental verification of the sensor power system which use piezoelectric energy conversion technology by the theoretical modeling for the applying on the train on-condition maintenance.