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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>
Sunjong Han,Insang Song,Kwangsik Chun 한국간담췌외과학회 2012 한국간담췌외과학회지 Vol.16 No.3
Backgrounds/Aims: Recently many studies have been reported the early results of a hepatectomy for various intrahepatic lesions. Also various types of laparoscopic hepatectomies are being performed in many centers. Some reports about the safety of laparoscopic parenchymal dissection of the liver have been published. In this study, we reported our experiences of laparoscopic left hepatectomies in patients with an intrahepatic duct (IHD) stone with recurrent pyogenic cholangitis (RPC), and investigated whether the total laparoscopic parenchymal dissection is as safe as open surgery. Methods: From April 2008 to December 2010, 25 patients had been admitted for left IHD stones with RPC. Preoperatively, the type of surgery was decided with the intention of treating each patient. Initially 10 patients underwent a laparoscopy-assisted left hepatectomy and the next 15 patients underwent total laparoscopic left hepatectomy as our experience grew. Demographics, peri- and postoperative results were collected and analyzed comparatively. Results: The mean age, gender ratio, preoperative American Society of Anesthesiologists (ASA) score, accompanied acute cholangitis and biliary pancreatitis, and the number of preoperative percutaneous transhepatic biliary drainage (PTBD) inserted cases were not different between the two groups who had undergone laparoscopy-assisted and totally laparoscopic left hepatectomy. The operation time, intraoperative transfusions and postoperative complications also showed no difference between them. The postoperative hospital stay did not show a significant difference statistically. Conclusions: In this study, we concluded that a laparoscopic left hepatectomy can be adapted to the patients with a left IHD stone with RPC. Also laparoscopic parenchymal dissection is safe and equivalent to an open procedure.
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.