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전충환,김상호,기호석,김민형,조대호,이기훈,조동근,김상훈,김연주,송영아,박강진,박선영,조성범,박창환,주영은,김현수,최성규,류종선 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.1
배경/목적: 역행성 췌담관내시경 후 발생하는 천공은 매우 드물지만 심각한 합병증의 하나로 알려져 있다. 과거에는 역행성 췌담관내시경 후 발생한 천공의 치료로 수술이 첫 번째로 고려되었으나 최근에는 내과 치료만으로도 좋은 결과가 있다는 보고가 있으나 아직까지 명확한 치료 지침은 없다. 방법: 2006년 1월부터 2011년 6월 말까지 역행성 췌담관내시경을 시행 받은 3265예 중 천공이 확인된 증례를 대상으로 후향적으로 의무기록을 검토하였다. 결과: 연구 기간 중 역행성 췌담관내시경 후 천공이 발생한 예는 6예(0.18%)였다. 6예 중 3예는 담도배액술을 시행 받았으며 플라스틱 스텐트 2예, 비담도배액술 1예였다. 담도 배액술을 시행 받은 환자는 수술 및 합병증 없이 평균 재원일 9.3일 만에 퇴원하였으나 담도 배액술을 시행 받지 않은 환자 3명은 모두 수술을 시행 받았다. 수술 후 1명은 사망하였고 2명은 회복하여 퇴원하였으나 평균재원일이 38일로 담도 배액군에 비하여 유의하게 길었다(p=0.001). 결론: 역행성 췌담관내시경 후 발생하는 천공의 치료 원칙은 아직 없으나 담도 배액술을 실시한 환자에서 수술을 피하고 재원기간이 짧았다.
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커먼레일 직접분사식 디젤엔진에서 시분해 레이저 유도 백열법을 이용한 매연 배출 특성
전충환,김규보,한휘영,장영준 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Recently, diesel vehicles have been increased and their emission standards have been getting strict. The emission of diesel vehicles contains numerous dangerous compounds, especially particulate matters cause a serious environmental pollutant and affect to human health seriously. Thousands of studies have already reported that particulate matters are associated with respiratory and cardiovascular diseases, and death. Due to these, it is necessary to measure the soot concentration and soot particle size in laboratory flames or practical engines to recognize the soot formation, and develop the control strategies for soot emission. In this study, the characteristics of exhausted soot particle size and volume fraction from 2.0L CRDI diesel engine have been investigated as varying engine speed and load. Laser induced incandescence has been used to measure soot concentration. Time-resolved laser induced incandescence has been used to determine soot particle size in the engine. The soot volume fraction is increased as increasing engine load but soot volume fraction is decreased as increasing engine speed. The primary particle size is distributed about 35nm~ 60nm at each experimental conditions.
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밀폐 연소실내의 메탄-공기 예혼합기의 연소 및 라디칼 특성에 관한 연구 (1)
전충환,장영준,Jeon, Chung-Hwan,Jang, Yeong-Jun 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2
To clarify the effects of equivalence ratio, initial pressure and temperature on the flame propagation and radicals characteristics, a series of the experimental study were conducted in a quiescent methane-air premixture using a constant volume chamber. The development of the flame was visualized following the start of ignition using high speed schlieren photo and radical images by intensified CCD camera. Combustion pressure and ion current were recorded simultaneously according to the experimental conditions which were equivalence ratio with 0.7 to 1.2, initial pressure with 0.08 MPa to 0.40 MPa and initial premixture temperature with 3l3.2K to 403.2K. The results showed that the flame speed by ion current and mass fraction burned by combustion pressure characterized the effects of flame propagation very well. And increased combustion duration due to lean combustion condition that was below equivalence ratio, 0.8 caused cycle variation and decreasing the power of engine.
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전충환,최성규,심다운,김상호,홍형주,정민우,조성범,박창환,주영은,김현수,유종선 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.2
Purpose: To evaluate the risk factors of hepatocellular carcinoma (HCC) extensioninto the right atrium (RA) and determine poor prognostic factors for HCC extensionto the heart. Materials and Methods: A total of 665 patients who were newly diagnosed with HCC were analyzed retrospectively from January 2004 to July 2012. The patients were divided into two groups: 33 patients with HCC extendinginto the RA and 632 HCC patients during the same period. The patients with HCC extending into the RA were subdivided into shorter survival group (<2 months) and longer survival group (≥2 months). Results: The prevalence of HCC extending to the RA was 4.96%. In multivariate analysis, a modified Union InternationaleContre le Cancer (UICC) stage higher than IVA, hepatic vein invasion, concomitant inferior vena cava and portal vein invasion, and multinodular tumor type were risk factors for HCC extending to the RA. In multivariate analysis, Cancerof the Liver Italian Program (CLIP) score >3 (p=0.016, OR: 13.89) and active treatment (p=0.024, OR: 0.054) were associated with prognostic factors in patients HCC extending into the RA. Active treatment such as radiation (n=1), transcatheterarterial chemoembolization (TACE) (n=11), Sorafenib (n=1), and combined modalities (n=2) were performed. Conclusion: Modified UICC stage higher than IVA, vascular invasion and multinodular tumor type are independent risk factors for HCC extending to the RA. Active treatment may prolong survival in patients HCC extending into the RA.
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엔진실린더 모형 연소실내의 메탄-공기 예혼합기의 화염전파속도 특성
전충환 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.2
Flame propagation speed characteristics of methante-air mixtures were experimentally investigated in combustion chamber modelled engine. Flame propagation process was known as a funtion of equivalence ratio initial pressure and initial temperature. Ion probe and schlieren photograph were applied to measure the local flame speed and flame radius in quiescent mixtures. Pressure was also measured to make sure of the reproducibility and to apply combustion analysis. Burning velocity was calculated from the flame propagation speed and combustion analysis. Flames were developed faster with higher initial pressure and initial temperature but showed maximum propagation speed at equivalence ratio 1.1 regardless of initial pressure and temperature. Local flame speed was maximum values at near midpoint between center and wall.
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