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외상성 후두개 뇌동맥류 : 증례보고 Case Report
김세중,최순관,배학근,이경석,신원한,윤일규,이인수,변박장 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.9
The traumatic intracranial aneurysm within the posterior cranial fossa is extremely rare. The case of a 18-year-old boy who developed and saccular aneurysm lately in the posterior fossa after a blunt head injury is reported. Repeated follow-up angiography demonstrated an saccular aneurysm at the junction of vertebral artery and posterior inferior cerebellar artery. Early brain MRI disclosed neither aneurysm nor mass. Late brain MRI revealed a partially thrombosed saccular aneurysm at the cerebello-pontine angle. Follow-up MRI and angiography is recommended if traumatic aneurysm is suspected.
주파수제어에 의한 MU-60 초음파모터의 온도보상에 관한 연구
서기열(Ki-Yeol Sea),신일철(Il-Ghul Shin),임중열(Jung-Yeol),최장균(Jang-Gun Choi),차인수(In-Su Gha) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
This paper describes the bending traveling-wave type ultrasonic motor which generates the traveling wave by combining two standing waves with phase difference time and space. In +20℃ ~30℃, the operation characteristic of USM has represented normal condition. But in the other temperature, the operation characteristic of USM has abnormal condition, that is driving frequency, drive current and r.p.m are down. The recent USM has controller without temperature compensation. This study aimed at fuzzy controller which must follow the frequency at operation temperature and then r.p.m and torque increased.
단일노즐을 사용한 내부순환 공기리프트 반응기에서 수력학과 액체의 흐름특성
김종철,장서일,손민일,김태옥 ( Jong Chul Kim,Sea Il Jang,Min il Son,Tae Ok Kim ) 한국공업화학회 1997 공업화학 Vol.8 No.5
기체분산기로 단일노즐을 사용한 내부순환 공기리프트 반응기에서 수력학과 액체의 흐름특성을 해석하였다. 실험은 공기-물계에서 기체속도와 반응기의 높이를 변화시키면서 국부지역의 기체체류량과 추적자의 충격-응답곡선을 측정하였다. 실험결과, 약 8 cm/s이상의 기체속도에서 상승관은 기포가 강한 합체를 일으키는 난류흐름을 나타내었고 하강관에서는 균일한 크기의 큰 기포들이 분산된 지역까지의 축방향 높이가 기체속도의 증가에 따라 감소하였다. 그리고 국부지역과 반응기 전체의 평균 기체체류량은 기체속도가 증가할수록 증가하였고 반응기 상부지역의 높이가 증가할수록 감소하였다. 또한 혼합시간은 기체속도보다 반응기 상부지역의 높이에 크게 영향을 받으며 이들이 증가할수록 감소하였다. 상승관과 하강관에서 액체의 흐름은 플러그흐름에 근접하였고 완전혼합흐름으로 볼 수 있는 반응기 상부지역의 크기에 따라 반응기 전체의 액체흐름특성이 크게 변화하였다. 이때 액체의 순환속도는 기체속도가 증가할수록 증가하였고 다른 기체분산기에서 보다 상당히 큰 값을 나타내었다. The hydrodynamics and the liquid flow characteristics were investigated in an internal circulation airlift reactor with a single nozzle as a gas distributor. In an air-water system, the gas holdup in the individual flow zone and the impulse-response curve of tracer were measured at various gas velocities and reactor heights. Experimental results showed that for the higher gas velocity(>about 8 cm/s), the flow behavior of bubbles in the riser was turbulent flow due to strong bubble coalescences and the axial height of dispersion zone of large bubbles having uniform sizes in the downcomer was decreased with increasing gas velocity. And mean gas holdups in the individual flow zone and the reactor were increased with increasing gas velocities and were decreased with increasing heights of the top section of the reactor. Also, the mixing time was larger effected by the height of the top section of the reactor and it was decreased with increasing the height of the top section and gas velocity. Flow characteristics of liquid in the riser andthe downcomer was tend to access to plug flow and the overall flow behavior ofliquid was mainly varied with the size of the top section which it was assumed to beperfect mixing zone. In these conditions, liquid circulation velocities were increased with increasing gas velocities and they were higher than those by using other gas distributors.
The Iatrogenic Complications of Colonoscopic Polypectomy: A Multicenter Retrospective Study
( Min Ho Choi ),( Yun Sun Choi ),( Chan Soo So ),( Woon Geon Shin ),( Kyoung Oh Kim ),( Hyun Joo Jang ),( Cheol Hee Park ),( Kyung Ho Kim ),( Jin Bae Kim ),( Il Hyun Baek ),( Kwang Ho Baik ),( Sea Hyu 대한장연구학회 2013 Intestinal Research Vol.11 No.1
Background/Aims: Colonoscopic polypectomy is an effective tool for the treatment of colonic polyps. With the recent widespread use of colonoscopic polypectomy, there is a growing concern about iatrogenic complications, such as bleeding and perforation. The aim of this study is to analyze the clinical presentation and management of complications during colonoscopic polypectomy. Methods: We retrospectively reviewed the medical records of colonoscopic examinations performed at 5 hospitals of Hallym University Medical Center between June 2005 and June 2008. Results: A total of 26,773 colonoscopies and 4,123 colonoscopic polypectomy were performed. The overall rate of complication was 1.04% (43/4,123). Perforation occurred in 0.19% (8/4,123) of cases, and bleeding occurred in 0.85% (35/4,123) of cases. Perforation occurred in 0.05% of snare polypectomies, 1.09% of endoscopic mucosal resections (EMR), and 7.14% of endoscopic submucosal dissections (ESD). Bleeding occurred in 0.8% of snare polypectomies, 1.09% of EMRs, and 3.57% of ESDs. The complication rate of ESDs was higher than in EMRs and snare polypectomies (P<0.001). Endoscopic clippings were performed in 25% of perforation and 66.7% of bleeding cases. Medical treatment was successful in 75% of perforation and 100% of bleeding cases. Conclusions: Colonoscopic polypectomy is a safe procedure for the treatment of colonic polyps, but rarely, serious complications occur. Compared to a snare polypectomy or an EMR, the complication of an ESD occurs more frequently. Endoscopic treatment and further conservative management seems to be appropriate in most cases with complication. (Intest Res 2011;13:46-51)
( Jai Hoon Yoon ),( Gwang Ho Baik ),( Yeon Soo Kim ),( Ki Tae Suk ),( Woon Geon Shin ),( Kyung Ho Kim ),( Kyoung Oh Kim ),( Cheol Hee Park ),( Il Hyun Baik ),( Hyun Joo Jang ),( Jin Bong Kim ),( Sea H The Editorial Office of Gut and Liver 2012 Gut and Liver Vol.6 No.4
Background/Aims: First-line therapies against Helicobacter pylori, including proton pump inhibitors (PPIs) plus two antibiotics, may fail in up to 20% of patients. ``Rescue`` therapy is usually needed for patients who failed the first-line treatment. This study evaluated the eradication rate of bismuth-containing quadruple rescue therapy over a 1- or 2-week period. Methods: We prospectively investigated 169 patients with a persistent H. pylori infection after the first-line triple therapy, which was administered from October 2008 to March 2010. The patients were randomized to receive a 1- or 2-week quadruple rescue therapy (pantoprazole 40 mg b.i.d., tripotassium dicitrate bismuthate 300 mg q.i.d., metronidazole 500 mg t.i.d., and tetracycline 500 mg q.i.d.). After the ``rescue`` therapy, the eradication rate, compliance, and adverse events were evaluated. Results: The 1-week group achieved 83.5% (71/85) and 87.7% (71/81) eradication rates in the intention to treat (ITT) and per-protocol (PP) analyses, respectively. The 2-week group obtained 87.7% (72/84) and 88.9% (72/81) eradication rate in the ITT and PP analyses, respectively. There was no significant difference in the eradication rate, patient compliance or rate of adverse events between the two groups. Conclusions: One-week bismuth-containing quadruple therapy can be as effective as a 2-week therapy after the failure of the first-line eradication therapy. (Gut Liver 2012;6:434-439)