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소아의 범발성 복막염을 동반한 천공성 충수염에서 복강경하 충수절제술 후 대량 흔들기 세척법 및 배액술의 역할
김우연,정재희,Kim, Woo-Yeon,Chung, Jae-Hee 대한소아외과학회 2011 소아외과 Vol.17 No.1
Use of laparoscopic appendectomy (LA) for perforated appendicitis (PA) in children remains controversial because of the development of postoperative intra-abdominal abscess formation. We developed the irrigation method for the prevention of abscess formation after LA performed for PA in children with severe panperitonitis. We called it 'the shaking irrigation'. The object of this study was to analyze the efficacy of this irrigation method. All cases of PA with severe panperitonitis in children that underwent LA with massive shaking irrigation and drainage between June 2003 and December 2007 were studied retrospectively. We included only PA with panperitonitis and large amounts of purulent ascites throughout the abdomen as well as an inflamed small bowel with ileus. Thirty-four children were involved in this study. The mean patient age was eight years. The mean amount of irrigation fluid was 8.2 L (range: 4-15 L), The mean operative time was 89.5 min. The mean length of the hospital stay was 5.1 days. There were no postoperative intra-abdominal abscesses. There was no conversion to open surgery. In conclusion, Use of LA in PA with severe panperitonitis in children is safe and effective. Massive shaking irrigation and abdominal drainage appears to prevent intra-abdominal abscesses after LA for PA with panperitonitis.
디페닐렌비닐렌 치환기를 가진 카바졸계 청색발광 공중합체 합성
김우연(Woo Yeon Kim),윤근병(Keun Byoung Yoon) 한국고분자학회 2013 폴리머 Vol.37 No.6
공액구조 고분자의 밴드갭을 줄이기 위하여 청색의 디페닐렌비닐렌을 치환기를 갖는 카바졸 단량체와 용해도향상을 위해 옥틸기를 도입한 카바졸 공단량체를 합성하여 신규 공중합체를 제조하였다. Suzuki 커플링 중합으로공중합체를 제조하고, 공중합체의 열적, 분광학적, 전기광학적 특성을 조사하여 고분자 유기발광 다이오드(PLED)의발광층에의 사용가능성을 조사하였다. 용액상태에서 공중합체의 UV 최대 흡수 파장은 333~340 nm, PL 최대방출 파장은 409~464 nm를 보였으며, 상대양자효율은 최대 25.8%의 값을 보였다. 열중량분석 결과 350 oC까지 열안정성을보이고, 필름형성이 용이하였으며, 공중합체를 발광층으로 사용한 PLED 소자에서 4.0 V에서 청색광을 나타내었다. Novel carbazole based copolymers were synthesized by Suzuki coupling polymerization. (Diphenylene)vinylene and n-octyl was introduced to carbazole as pendants for reducing band gap and improving solubility, respectively. Thermal,photoluminescence and electro-luminescence of copolymers were studied for applying the emitting layer of polymer light emitting diode (PLED). Maximum UV-vis absorption and photoluminescence (PL) emission wavelength of copolymers showed 333~340 nm and 409~464 nm in solution state, respectively. The relative quantum yield using 9,10-diphenylanthracene as a reference was 25.8%. These copolymers exhibited high thermal stability (Td = 350 oC) and good film forming ability. Good luminance was obtained at voltages lower than 8 V and the onset voltage was observed at 4.0 V.
김우연(Woo-Yeon Kim),김승종(Seung-Jong Kim),이종민(Jong Min Lee),정성종(Sung-Chong Chung) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.10
This paper suggests a new linear motor which is able to levitate as well as move its mover without any linear bearing or even additive windings. Its structure is very similar to a well-known both-sided linear motor which consists of two stators and a common mover. And the movement principle is the same with that of conventional linear motor. But unlike the conventional one, the amplitudes of phase currents are controlled to levitate the mover. In this paper, the structure and principle of the suggested bearingless linear motor are introduced in detail and its feasibility is experimentally investigated. Using the prototype and a very simple controller, we succeeded in the levitation and linear movement of the mover at a time.
플라이휠 에너지 저장장치를 위한 저 전력소모 하이브리드 마그네틱 베어링의 설계
김우연(Kim, Woo-Yeon),이종민(Lee, Jong-Min),배용채(Bae, Yong-Chae),김승종(Kim, Seung-Jong) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.8
For the application into a 1 kWh flywheel energy storage system(FESS), this paper presents the design scheme of radial and axial hybrid magnetic bearings which use bias fluxes generated by permanent magnets. In particular, the axial hybrid magnetic bearing is newly proposed in this paper, in which a permanent magnet is arranged in axial direction so that it can support the rotor weight as well as provide a bias flux for axial magnetic bearing. Such hybrid magnetic bearings consume very low power, compared with conventional electromagnetic bearings. In this paper, to stably support a 140 kg flywheel rotor without contact, design process is explained in detail, and magnetic circuit analysis and three-dimensional finite element analysis are carried out to determine the design parameters and predict the performance of the magnetic bearings.
김우연(Woo-Yeon Kim),우종진(Jong-Jin Woo),김승종(Seung-Jong Kim),이종민(Jong Min Lee),정성종(Sung-Chong Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This paper introduces of a PM-type synchronous linear motor without any bearing or guide for supporting a mover. Instead, the mover is magnetically levitated based on the symmetric structure consisting of two identical stators. For the linear movement, the current driving method is again the same as the conventional one. But for the (self-) magnetic levitation, the magnetic forces acted between the two stators and the mover should be controlled depended on the air gaps between them. For this, the magnitude of the phase current flowing in each coil is increased or decreased from its normal value. For self-levitation, this study proposed the control current of which the magnitude is increased or decreased from normal value according to a variation of the air gap. The result of experiment shows that vertical and pitching motions are actively controlled and the other directional motions are passively stable even while moving.