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Cerulein 유도 급성췌장염에서의 활성산소라다칼의 역할
노임환(Im Hwan Roe),송일한(Il Han Song),김정원(Jung Won Kim),양미라(Mi Ra Yang),김정택(Jung Taik Kim),이종화(Jong Hwa Lee),박동국(Dong Guk Park),임창영(Chang Young Lim),이명인(Myung In Lee),손소희(So Hee Sohn),진영주(Young Joo Jin),조 대한소화기학회 1997 대한소화기학회지 Vol.30 No.6
Backgroung/Aims: Oxygen radicals are suggested to be an imponant role in the pathogenesis of acute pancreatitis in experimental animals. Cerulein is closely related to the cholecystokinin and it is a potent stimulant of pancreatic exocrine secretion. The purpose of this study was to evaluate the effect of free oxygen radicals in the cerulein induced acute pancreatitis. Methods: Two groups of male Sprague Dawley rats weighing 380-420gm were studied: control group(n=12), fasted for 12 hours the animals with intraperitoneal injection twice of 0,9% saline with a l-hour interval, and cerulein group(n=20), animals who fasted for 12 hour received two intraperitoneal injections of cerulein at hourly intervals(40 microgram/kg). After 4 hours of observation time, serum-amylase and the tissue content of malondialdehyde, glutathione and histology was studied. Results: Serum amylase in the cerulein group was significantly high(p<0.001), compared with the control group. Also glutathione level of pancreatic tissue was decreased significantly(p<0.01) and pancreatic malondialdehyde level was increased significantly(p<0.01) in the cerulein treated group. In pancreatic histology, pancreatic ederna including acinar cell atrophy, periductal intlammation, and periductal fibrosis were observed in all cases of cerulein treated group. Conclusions: We concluded that the profound depletion of the activity of glutathione and increase of malondialdehyde occuring after cerulein induced pancreatitis seemed to be important in tissue injury and oxygen radicals might be responsible for an important step in the initation of acute pancreatitis. (Korean J Gastroenterol 1997; 30:808-814)
Dong Guk Ko,Seung Jong Ko,Eun Kyung Choi,Sang Guen Min,Sang Hyub Oh,Jinsang Jung,Byung Moon Kim,Ik-Tae Im IEEE 2014 IEEE transactions on semiconductor manufacturing Vol.27 No.4
<P>The purpose of this paper was to estimate the reduction efficiency of an abatement system for perfluorocarbon (PFC) gases produced during semiconductor manufacturing processes. The reduction efficiency currently used in the semiconductor industry, the destruction and removal efficiency (DRE), considers only the destruction ratio of PFC gases. A method estimating the reduction efficiency, which in addition to measure the destruction ratio also considers the energy consumption and byproducts produced during the treatment of PFC gases, was proposed in this paper; this efficiency was defined as the net reduction efficiency (NRE). For the estimation of the reduction efficiency, measurements were made using a plasma-wet type abatement system installed in an actual semiconductor manufacturing plant. The destruction ratio of the PFC gases was measured using Fourier transform infrared spectroscopy and quadrupole mass spectroscopy. The energy consumption was measured using an electricity meter. Based on these measurements, the DRE and the NRE of the PFC gases were calculated and compared. The results indicated that the DRE showed high reduction efficiency while the NRE showed lower values.</P>
Perception on the Teachers` Use of English Only in Korean EFL Classrooms
이종복 ( Jong Bok Lee ),임여국 ( Yeo Guk Im ) 한국현대언어학회 2011 언어연구 Vol.26 No.4
The most considerable change of the English language educational policy in Korea is the implementation of Teaching English in English (TEE) only in English classes at all school levels. Although teaching target languages (TLs) in TLs only has been preferred throughout many decades, the issue of TLs only in class is extremely controversial among researchers. Therefore, this study first collected and analyzed official documents related to TEE policy in order to examine the emphasis of TEE only in Korea. Recent and earlier theoretical and empirical literature regarding teachers` use of TLs in TL classes is reviewed in order to find whether teachers` use of TLs only and avoidance of students` first languages (L1s) is effective or not. Quantitative analyses of the official documents provided that the pressure on TEE only from authorities has been stronger and made English teachers teach English in English only. Qualitative analysis of theoretical and empirical review demonstrated that TEE only in an EFL setting is not a good strategy when students` English proficiency is low. In addition, students` L1s can be a useful tool to understand English better. Finally, the research review offered that the balance between use of an L1 and a TL is recommended.
임종국,이윤진,이승용,Im, Jong-Guk,Lee, Yun-Jin,Lee, Seung-Yong 한국컴퓨터그래픽스학회 2002 컴퓨터그래픽스학회논문지 Vol.8 No.3
고명암 대비 영상은 일반적인 영상가는 달리 장면의 휘도를 그대로 지니고 있기 때문에 많은 분야에 걸쳐 유용하게 사용되고 있다. 하지만 고명암 대비 영상은 영상 출력 장치가 표현 가능한 명암 대비의 범위를 벗어 나기 때문에 고명암 대비를 압축해야만 영상 출력 장치에 나타낼 수 있다. 본 논문에서는 고명암 대비 영상을 점진적 영상으로 변환하여 명암 대비를 압축하는 방법을 제시한다. 점진적 영상은 점진적 메쉬에 기반한 영상 표현 방법으로 하나의 영상을 기반 영상과 정점 분할 및 세부 정보의 나열로 표현한다. 점진적 영상으로 표현된 고명암 대비 영상은 기반 영상과 세부 정보의 크기를 스케일링하여 명암 대비를 압축한다. 스케일링에 사용되는 가중치는 세부 정보의 크기에 대한 함수로 구할 수 있으며 세부 정보가 클수록 작은 가중치를 사용하여 그 크기를 많이 줄여 주고 세부 정보가 작을 수록 원래 세부 정보와 비슷하게 만든다. 이 알고리즘을 사용하면 영상의 무늬는 남기면서 명암 대비를 압축시킬 수 있다. Recently, high dynamic range (HDR) compression has attracted much attention due to the wide availability of HDR images. In this paper, we present an HDR compression method using a progressive image, which is a multi-level image representation based on a progressive mesh. An HDR image can be decomposed into a base image and a sequence of details by conversion into a progressive image. This decomposition provides a good structure to highly compress the dynamic range while preserving image details. The base image and larger details are considerably scaled down but smaller details are slightly scaled down. Experimental results show that our method successfully generates HDR compressed images without halo artifacts by controlling two intuitive parameters.
액상교반법에 의한 AI/TiCp 복합재료의 제조에 관한 연구(I)
임종국,김명한,최재하,Im, Jong-Guk,Kim, Myeong-Han,Choe, Jae-Ha 한국재료학회 1993 한국재료학회지 Vol.3 No.5
TiC 입자를 강화재로 한 AI금속기지 복합재료를 액상교반법으로 제조하는데 따른 제조조건과 물성특성과의 관계를 조사하였다. TiC 입자는 중량비 10%를 첨가하였으며, 젖음성을 향상시키기 위하여 1.5wt%의 Mg을 첨가하였다. TiC입자 첨가에 의하여 내마모 특성, 인장강도, 경도 등이 증가 되었으나 과도한 교반은 기계적 특성을 저하시켰다. 본 실험조건에서 교반 속도의 최적조건은 500rpm이었다. Wetting agent로서 첨가한 Mg은 기지에 고루 분산하였다. The mecllanical properties of AI/TiCp composite fabrication by liquid mixing was investigat ed. The composites, containing 10 wt% Tic. were producwi using induction furnace with mechanical stirring. The amounts of' 1.5wt% Mg were, added to wetting agents. Thr presence of aluminum in TiC composites showed rnhanced strengrh without loss of ductility at room and clrvated temperatures. Espe cially, wear resistance was found to dramatically irnprovc. I3ul excess stirring d~terrninrd the mect~ani~ cal properties. Approximate values at present work were 500 rpm. There was no inrerfacial reaction of any kind and the interface remains clearly deineated.