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김태우,김승범,권혁찬,문선재,윤정훈,김형준,차인호,육종인,김진 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1
Periosteal osteosarcoma is a distinct entity of malignant bone tumor with characteristic clinical, morphological, and histological features within the group of juxtacortical osteosarcoma. Periosteal osteosarcoma is predominantly located in the tubular long bones, and extremely rarely involving the jaws. A case of periosteal osteosarcoma of the right mandible is presented. A 27-year-old woman complained of the gingival swelling and bleeding tendency of the right posterior mandible. Clinical examination revealed a reddish brown strawberry-like swelling on the affected mucosa, which measured 1.5㎝×1.5㎝. The tumor was located on the lingual cortex of the mandible and extended into the surrounding soft tissues. Microscopically, the tumor consisted exclusively of atypical chondroblastic cells with a small osteoblastic area. A minimal bone marrow involvement was noted and the adjacent cortex was free of tumor. These findings suggested that the tumor originated from the periosteal cambium layer, which lies between the periosteal fibrous layer and the cortex of mandible.
박종혁,이우범,이정전 國立 麗水大學校 環境問題硏究所 1998 環境硏究論文集 Vol.1 No.-
As turbulent flow include a complex physical process in the convective boundary layer(CBL), it is difficult to explain the physical phenomena exactly. Therefore, it is possible to explain the model in a simple and limited way. For the explanation of the CBL turbulence, enormous amounts of data are required concerning in CBL turbulence. A method to study the structure and characteristics of CBL is numerical simulation of important parts of the flow field i.e. through large eddy simulation(LES). In this study, turbulence in the CBL uniformly heated from below and topped by a layer of uniformly stratified fluid is investigated for flows by numerical simulation(LES). LES uses a finite-difference method to integrate the three-dimensional grid-volume-averaged Navier-Stokes equation for a Boussinesq fluid. In LES, the contribution of the large-carrying structures to momentum, heat and energy transfer are computed exactly, and only the effect of the smallest scales of turbulence is modeled. The purpose of this study is to analyze the velocity and temperature distributions in CBL turbulence in order to study the dispersion of atmospheric pollutant by LES.
ECAP 강가공에 의한 5083 Al 합금의 초소성 변형
이정국,서창우,김병철,신동혁 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1
초기 결정립 크기가 200 μm인 상업용 5083 Al 합금에서 equal channel anglar pressing(ECAP) 강가공에 의하여 결정립을 초미세화 시킬 수 있었다. ECAP는 200℃에서 수행되었고, 반복 passes시 180˚ 회전을 주면서 같은 시편에 8 passes까지 강가공을 가하였다. 미세조직 특징은 1 pass후 평균 0.2 μm의 폭과 0.8 μm의 길이를 갖는 연신된 평행한 bands가 균일하게 형성 되었고, 4 passes후 결정립 크기가 약 0.3 μm인 등축의 초미세 결정립이 얻어졌다. 이러한 초미세 결정립을 갖는 5083 Al 합금에서 저온 초소성 성질이 얻어졌는데, 약 0.5 μm의 결정립 크기를 갖을 때 250℃이하의 온도에서 연신율이 200 %이상인 초소성 거동을 나타내었다. An ultrafine grained structure was introduced into a commercial 5083 Al alloy with the initial grain size of ∼200 μm using the equal channel angular pressing technique. Equal channel angular pressing was successfully conducted at 200℃ and the results showed that the microstructure was reasonably homogeneous after single passage and consisted of parallel bands of elongated substructure having the average width of 0.2 μm and the average length of 0.8 μm. Repetitive passes were conducted on the same sample up to total 8 passes through the die so that the sample was rotated 180˚ around its longitudanal axis between passes. An equiaxed ultrafine grained structure of ∼0.3 μm was obtained in the present alloy after 8 passes. It was found that a 5083 Al alloy with the grain size of ∼ 0.3 μm exhibited a superplastic-like behavior with elongation to failure in excess of 200% below.
문준동,김수진,문철규,최성혁,전정민,이성우,홍윤식 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3
Background: This study's objective was to determine the prognostic value of the base deficit measured in the emergency department(ED) and to determine whether base deficit can provide information not provided by advanced injury scoring system. Methods: This study was a retrospective analysis of data collected for two years. Thirty-two severe trauma patients who were admitted to the Emergency Department of Korea University Hospital were included in this study. The patients were divided into two groups: the normal base deficit group(-3 mmol/L to 3 mmol/L) and the elevated base deficit group(>3 mmol/L). The base-deficit value, age, sex, head injury, organ failure rate, and survival were considered, and the also Revised Trauma Score(RTS), Acute Physiology And Chronic Health Evaluation(APACHE II), and Injury Severity Score(ISS) were measured. Result: The elevated base-deficit group showed a lower survival rate and a higher organ failure rate compared to the normal base deficit group. Logistic Regression showed a strong association between base deficit and mortality rate. Among the previous injury scoring Systems(RTS, APACHE II, ISS), base deficit had the strongest correlation with RTS. By using base deficit value and the RTS together, we obtained a higher positive predictive value than that obtained by using base deficit or RTS alone. Conclusion: The admission value of the base deficit in the ED is a useful tool in predicting the outcome in severe trauma patients, and it can be an adjunct to previous injury scoring systems. As an advanced injury scoring System is developed in the future, the base deficit may have some significant role.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1994)
김재홍,안진균,정성재,김영태,김중환,김시영,이석종,이홍렬,서호석,김경훈,권혁진,정우권,고우석,이용석,안필수,오준규,오용섭 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1
Background : In recent years gonorrhoea has been panendemic and remains one of the most common Sexually Transmitted Diseases in the world, especially in developing countries. Objective & Method : For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria Gonorrhoeae(PPNG), Ive have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1994, 168 strains of N. gonorrhoeae were isolated, among which 109 (64,9% ) were PPNG. Conclustion : Our results suggests that the prevalence of PPNG in Seoul is still increasing.
( Woo Hyuk Choi ),( Hong Joo Kim ),( Jung Ho Park ),( Dong Il Park ),( Yong Kyun Cho ),( Chong Il Sohn ),( Woo Kyu Jeon ),( Byung Ik Kim ) 대한소화기학회 2007 SIDDS Vol.9 No.-
Background/Aims: There has been no report concerning the predictive capability of each scoring system for the complications of liver cirrhosis, such as variceal bleeding and hepatic encephalopathy. The aim of the present study was to evaluate the any predictive capability of each scoring systems, especially those which measure the dynamic changes of residual liver functions over time (△scores), in a large cohort of patients admitted to a tertiary-care institution with or without complications of liver cirrhosis. Methods: We retrospectively studied 128 patients with liver cirrhosis (92 males, 36 females, median age 53 years, range 28~80) admitted to our institution from March 2004 to April 2006. Seventy three patients (57.0%, group 1) admitted due to the complications of cirrhosis (variceal bleeding and encephalopathy), and 55 patients (43.0%, group 2) admitted due to the causes unrelated to complications of cirrhosis (such as acute pyelonephritis). We calculated the model for end stage liver disease (MELD), MELD-Sodium (MELD-Na), and Child-Turcotte-Pugh (CTP) scores on admission, and at 3 and 6 months prior to admission. Results: The relative risk of complications for the patients group with △MELD/3 months ≥2, △MELD-Na/3 months ≥2 and △CTP/3 months ≥1 was 2.61 (95% CI 1.57~4.34, p<0.01). 1.93 (95% CI 1.27~2.92, p<0.01), and 3.52 (95% CI 1.87~6.60, p<0.01), respectively. The area under receiver operating characteristic (ROC) curve of △MELD /3 months, △MELD-Na/3 months, and △CTP/3 months for the occurrence of cirrhotic complications were 0.758, 0.711, and 0.711, respectively. Higher △MELD/3 months (≥2), △MELD-Na/3 months (≥2), and △CTP/3 months (≥1) were all associated with decreased survival. Conclusions: △MELD/3 months, △MELD-Na/3 months, and △CTP/3 months were clinically useful parameters predicting the occurrence of cirrhotic complications, such as variceal bleeding and hepatic encephalopathy.