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이순종(Sunjong Lee),최유준(Youjun Choi),김성일(Sungil Kim),금복희(Bokhee Keum),서동관(DongKwan Seo) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
급전선 기반 자율주행 기술은 온라인 전기자동차(On-Line Electric Vehicle. OLEV)가 급전선으로부터 무선으로 공급받는 우선 전력공급의 효율을 극대화함과 동시에 급전선으로부터 발생된 자계패턴을 인식하여 저가의 센서 시스템을 이용하여 온라인 전기자동차의 자율주행을 가능하게 한다. 급전도로에서의 자계 패턴은 급전선이 구축된 형태에 따라 결정된다. 따라서 다수의 자계센서를 통하여 온라인 전기자동차가 주행 중인 급전도로의 자계 신호를 센싱하고, 이률 이용한 급전선 기반 자율주행기술 개발을 위한 자계센서시스템을 제안한다.
Nature-inspired porous gas sensor with stable response in humid condition
Cheonji Lee(이천지),Sunjong Oh(오선종),Seung-Chul Park(박승철),Jinkee Lee(이진기),Hyuneui Lim(임현의) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Animals have an excellent sense of smell because they have more olfactory cells than humans. In particular, dogs with great olfactory ability have 1000 times more olfactory receptor cells and 6-50 times larger area of epithelial cells than humans. Likewise, in gas sensors, the ability to detect gas is improved through nanostructures and porous structures. Unlike olfactory cells, ceramic gas sensors that measure gas by reacting with oxygen on the surface have errors depending on the environment and the gas selectivity. Previous studies have shown selectivity for gases by controlling the operating temperature of the gas sensor. However, humidity interferes with the signal to other gases by bonding with oxygen on the surface. In our study, we design a nanoporous ceramic gas sensor that has stable signals even in a humid environment.
Highly Flexible Magnetoelectronic Device Integrated With Embedded Ag Nanoparticle Electrode
Sunjong Oh,Jong-Su Yu,Jaein Lim,Jadhav, Mital,Taik-Min Lee,Dojin Kim,CheolGi Kim IEEE 2013 IEEE SENSORS JOURNAL Vol.13 No.10
<P>A flexible magnetoresistance (MR) device is fabricated through the hybrid process of embedding an Ag nanoparticle electrode by thermal imprinting and magnetic multilayer sensor element by sputtering on a polyethylene naphthalate (PEN) substrate. The MR signal profiles for a ring type sensor deposited on the PEN substrate show typical anti-symmetric curves centered for the field H=0, and the maximum signal and its field sensitivity are nearly the same as those of sensors deposited on Si and glass substrates. The root mean square (rms) roughnesses and magnetic properties of magnetic thin film deposited on the different substrates show that H<SUB>ex</SUB> was decreased with increasing roughness. Further, MR change with temperature had no significant effect on the sensor performance. The stability of Au electrode and Ag paste electrode were compared during the bending of MR sensor, revealing the cracking of Au electrode above 45°. However, Ag paste electrode was stable up to 90°. The field sensitivity of the MR signal for the full range of fields is inversely proportional to the effective anisotropy field, which is the sum of exchange-bias and stress-induced anisotropy fields. As a whole, the field sensitivity of MR signal depends on bending stress at the sensor position.</P>