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압전 필름의 압전정 효과를 이용한 에너지 저장 시스템에 관한 연구
최범규(Bumkyoo Choi),이우훈(Woo-hun Lee) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.9
Piezoelectric materials have been investigated as vibration energy converters to power wireless devices or MEMS devices due to the recent low power requirements of such devices and the advancement in miniaturization technology. Piezoelectric power generation can be an alternative to the traditional power source-battery because of the presence of facile vibration sources in our environment and the potential elimination of the maintenance required for large volume batteries. This paper represents the new power source which supplies energy device node. This system, called energy harvesting system, with piezo materials scavenges extra energy such as vibration and acceleration from the environment. Then it converts the mechanical energy scavenged to electrical energy for powering device This paper explains the properties of piezo material through theoretical analysis and experiments The developed system provides a solution to overcome the critical problem of making up wireless device networks.
최범규(Bumkyoo Choi),이제윤(Je-yun Lee),이우훈(Woo-hun Lee),오재근(Jae-geun Oh) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.2
Mostly used sensors have wired powering and two-way cable systems. It is difficult to employ wired sensor network in ubiquitous era because of a number of sensors and cables. Therefore, sensor networks move from wired systems to wireless systems for the future. However, the power source is a critical obstacle for wireless sensornodes. This research represents the new power source which supplies energy sensor node, maintains over 10 years, and thus replaces batteries with limit of lifetime. The system with piezo materials scavenges extra energies such as vibration and acceleration from the environment. Then it converts the scavenged mechanical energy to electrical energy for powering a sensor, a control1er and a circuit for regulating voltage and transmitting sensor value. This study explains the properties of piezo material through theoretical analysis and experiments, and demonstrates powering sensor and transmitting data with stored energy(35mJ) for 14 sec. The developed system provides a solution to overcome the critical problem of making up wireless sensor networks.
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.