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Hydroxypropyl Methyl Cellulose 의 분진 폭발특성에 관한 연구
임우섭,목연수 한국산업안전학회 2000 한국안전학회지 Vol.15 No.4
This study was performed in Hartmann type dust explosion apparatus in order to research the dust explosion characteristics of hydroxypropyl methyl cellulose(HPMG): minimum explosive limit, minimum ignition energy, limiting oxygen concentration, maximum explosion pressure, rate of pressure rise, etc. The samples of HPMC dust were distributed into 120-140 mesh, 170-230 mesh and 325 under, and the gap distance of the discharge electrode was setted up at 5㎜. The experimental results were obtained as follows: ① The minimum explosive limit for HPMC dust was founded at 180g/㎥, the minimum ignition energy at 9.8mJ and the limiting oxygen concentration at 12%. ② The maximum explosion pressure of HPMC dust was 8.1㎏/㎠·abs at the concentration of 500g/㎥ and the maximum rate of pressure rise was 203.98 bar/sec at the concentration of 480g/㎥ for 325 under.
응급의학과 전공의에 의한 복부 컴퓨터단층촬영 예비판독의 정확성 및 되먹임 영상교육
임우섭,김종근,안재윤 대한응급의학회 2015 大韓應急醫學會誌 Vol.26 No.5
Purpose: For the differential diagnosis of acute abdomen, abdominal computed tomography (CT) is commonly performed in the emergency department (ED). Rapid and accurate interpretation after CT is essential; however, final interpretation of the images by a board-certified radiologist for 24 hours a day is nearly impossible. Therefore, a preliminary interpretation is mainly made by emergency physicians in the ED, which may result in some discrepancy with the interpretations of board-certified radiologists. This study was conducted to determine the discrepancy rate of emergency medicine (EM) residents’preliminary interpretation and any reduction in discrepancy through feedback imaging education programs by attending radiologists. Methods: This was a before-and-after study, including 540 cases of abdominal CT scans performed in the ED between November 1, 2014 and April 30, 2015. Residents first documented their preliminary interpretation of 300 cases for 3 months. Board-certified radiologists then provided feedback image education to EM residents for these cases for 1 month. After feedback education, preliminary interpretations of 240 cases were documented for 2 months. Discrepancy rates before and after feedback education were then analyzed. Results: Total and major discrepancy rates before feedback image education were 28% and 11.7%, respectively, which declined to 14.6% and 4.6%, respectively, after feedback image education (p<0.05). Conclusion: Feedback image education was effective in reducing the discrepancy rate of the interpretation of abdominal CT scans by EM residents.
임우섭,최원호,신경식 대한기계학회 1990 大韓機械學會誌 Vol.30 No.5
펌프의 진동은 설치후 많은 원인이 복합되어 발생하는 것이 일반적이므로 예기치 못하는 경우가 많다. 따라서 진동발생시에 어떻게 체계적인 검토를 거쳐 그 원인을 찾을 것인가, 그리고 원인 제거를 어떻게 효과적으로 수행할 것인가 하는 것이 실제로는 가장 중요한 문제이다. 대형펌 프에서 진동이 발생했을 경우 그 해결을 위해서는 엄청난 경비와 시간이 필요한 경우가 적지 않다. 이러한 측면에서 펌프의 진동을 가장 경계적이고 용이하게 그리고 단시간에 해결할 수 있는 여러 가지 방법이 연구되어야 한다. 그 일례로 실기에 직접 사용할 수 있는 각종의 동흡 진기(dynamic absorber)의 고안과 최적설계 등은 훌륭한 연구과제의 하나이다. 그리고 최근 고 도로 발달한 측정계기, 컴퓨터, 데이터처리 S/W등을 병용한 진동 모니터링(monitoring)에 의한 기기의 이상 진단과 예방 시스템 개발에 관한 연구도 보다 활발히 진행될 필요가 있다.