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Dae Young Cheung,Byung Ik Jang,김상욱,김지현,김현건,Jeong Eun Shin,윤원재,Yong Kang Lee,정광현,조수정,신현필,조선영,신운건,Kee Don Choi,김병욱,권중구,양희찬,권태근,Hyun Gun Kim,안동원,Kwang Bum Cho,Sun Hee Kim,Kyong Hwa Hwang,Hee Hyuk Im 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.3
The area of endoscopic application has been continuously expanded since its introduction in the last century and the frequency ofits use also increased stiffly in the last decades. Because gastrointestinal endoscopy is naturally exposed to diseased internal organsand contact with pathogenic materials, endoscopy mediated infection or disease transmission becomes a major concern in this field. Gastrointestinal endoscopy is not for single use and the proper reprocessing process is a critical factor for safe and reliable endoscopyprocedures. What needed in these circumstances is a practical guideline for reprocessing the endoscope and its accessories whichis feasible in the real clinical field to guarantee acceptable prevention of pathogen transmission. This guideline contains principlesand instructions of the reprocessing procedure according to the step by step. And it newly includes general information and updatedknowledge about endoscopy-mediated infection and disinfection. Multiple societies and working groups participated to revise;Korean Association for the Study of the Liver, the Korean Society of Infectious Diseases, Korean College of Helicobacter and UpperGastrointestinal Research, the Korean Society of Gastroenterology, Korean Society of Gastrointestinal Cancer, Korean Associationfor the Study of Intestinal Diseases, Korean Pancreatobiliary Association, the Korean Society of Gastrointestinal Endoscopy Nursesand Associates and Korean Society of Gastrointestinal Endoscopy. Through this cooperation, we enhanced communication andestablished a better concordance. We still need more researches in this field and fill up the unproven area. And our guidelines will berenewed accordingly.
DGEBA / MDA / SN 계 트링 열화 현상의 프랙탈 특성
조영신,심미자,김상욱 ( Young Shin Cho,Mi Ja Shim,Sang Wook Kim ) 한국공업화학회 1995 공업화학 Vol.6 No.6
내 충격성을 강화시키기 위해 SN이 도입된 DGEBA-MDA-SN계에서 교류 고전계 인가하에 발생하는 장기 열화현상인 전기트리의 형상을 프랙탈 차원을 이용하여 정량적인 해석을 시도하였다. 인가전압을 달리하여 트리 길이를 측정하고, scale-covering 법에 의해 프랙탈 차원을 구하였다. 발생된 트리는 프랙탈성을 나타내었고 인가전압이 증가함에 따라 프랙탈 차원은 감소하였다. 그리고 전계 인가시간에 따라 증가하다가 수렴하여 특정한 차원을 갖는 트리로 성장함을 확인할 수 있었고, 형상의 변화를 프랙탈 차원 관찰을 통하여 정량적으로 해석할 수 있었다. The long term deterioration associated with the phenomenon of electrical treeing in the DGEBA-MDA-SN system is discussed quantitatively from the viewpoint of fractal dimension analysis. Samples in this investigation were SN introduced DGEBA-MDA-SN system to reinforce the impact resistance of conventional DGEBA-MDA system. The experiment was carried out under AC high voltage application. The generated tree was observed through image analyzer. After that, the tree length was measured and the fractal dimensions of electrical tree was estimated by using a scale-covering method. The results showed that the electrical tree patterns are fractal objects and they can be quantified by means of fractal dimensions.