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최범규(Bumkyoo Choi),강호진(Ho-jin Kang),김민석(Min-sock Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.6
MEMS 기술의 향상과 함께 -TAS(Micro Total Analysis System)가 개발 되어 의료 및 생물학 분야가 급속하게 성장했다. TAS의 한 분야로 Chip 위에서 소량의 sample과 반응물을 가지고 혼합공정과 분석공정이 이루어지는 LOC(Lab on a chip)에 관한 연구는 활발하게 연구되어진다. LOC는 마이크로 펌프 와 마이크로 믹서와 같은 microfludic 장치들로 구성된다. Microfluidic 시스탬의 유동이 층류 유동이므로 유체상태의 반응물들을 효율적으로 혼합하고 공급하는 것이 어렵다. 본 논문은 이송 및 혼합이 동시에 이루어지는 MHD micropump의 설계와 제작에 관해 제시하였다. 최종 개선사양은 상용 CFD 프로그램의 해석결과를 통하여 결정하였다. With the development of micrototal analysis systems (?TAS), which is a result of enhancement of MEMS technology, rapid progress has been achieved in medical and biological research. The study of lab-on-a-chip (LOC) devices, which are types of ?TAS and which integrate the functions of mixing and analyzing tiny amounts of samples and reagents on one chip, has actively progressed. An LOC comprises microfluidic components such as micromixers and micropumps. Because the flow in a microfluidic system is generally laminar, it is very difficult to efficiently mix and feed fluid reagents. This paper presents the design and the method of fabrication of an MHD micropump for mixing fluids. By using this micropump, fluids are simultaneously mixed and pumped; this is achieved by coupling the Lorentz force and force exerted by an electric charge moving in an electric field.
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.
이제윤(Jaeyun Lee),오재근(Jae-geun Oh),최범규(Bumkyoo Choi),전재형(JaeHyung Chun),김주곤(JooGon Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
70% of energy exhausted in the types of energy losses, such as vibration, thermal and noise, during the vehicle driving. This study suggests energy conversion system with piezoelectric materials using vibration that is a kind of energy losses. Energy conversion system is validated in the lab with a shaker by the measured acceleration data for driving on the road. The results of driving acceleration are 0.4g at 10㎐. Energy conversion system is designed to own the natural frequency at 10㎐. Experiments result in 150V(pk-pk) and 25㎽(rms) at 0.4g, 10㎐. Power consumption for wireless communication and data transmission is about 45㎽. Suggested energy conversion system can power a sensor system to transmit acquisition data from sensors every two seconds. Therefore, this study is meaningful access to adopt wireless sensor system inside the vehicle.