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이재균,이승훈,김한수,Lee, Jae-Kyoon,Lee, Seung-Hoon,Kim, Han-Soo 한국전산구조공학회 2022 한국전산구조공학회논문집 Vol.35 No.5
본 논문에서는 등가 단자유도를 이용하여 구조부재의 정적변위를 고려하는 해석기법을 제시하였다. 기존의 단자유도 비선형 동적 해석 알고리듬을 구조부재의 초기정적변위의 영향을 고려할 수 있도록 개선하였다. 가정된 폭발하중 지속시간과 부재의 고유주기 비에 따라 정적변위가 최대응답에 미치는 영향의 차이와 폭발하중의 방향과 초기변위의 방향에 따른 차이를 확인하였다. 이에 따라 기존의 응답 차트를 정적변위를 고려할 수 있도록 폭발하중의 형태에 따라 각각 제시하였다. 설계 예제를 정적변위가 고려된 응답 차트에 적용하여 부재의 최대 변위를 비교 및 분석하였다. 본 연구의 결과를 통해 초기 정적변위를 고려한 구조부재의 최대응답을 쉽게 산정할 수 있으며 본 연구에서 제시한 응답 차트는 플랜트 또는 군사시설물의 내폭 설계에 활용될 수 있다. In this paper, an analysis method that considers the initial static displacement of structural members using an equivalent single-degree-of-freedom system is presented. Newmark's dynamic analysis algorithm was improved to consider the effect of the initial static displacements of structural members. The effect of the initial static displacement on the maximum response according to the assumed duration of the blast load and natural period of the member was investigated. The effects of positive and negative static displacements on the maximum dynamic responses of structural members subjected to a positively applied blast load were also studied. Modified response charts for the shock-type and pressure-type waves are presented so that static displacements can easily be considered. Using a design example, we demonstrate the significance of the modified response chart that considers the static displacement. Based on the results of this study, the maximum response of a the structural member can be easily obtained whilst considering its initial static displacement. The modified response chart presented in this study can be used for the structural design of plants and military facilities.
확장성 심근병증을 나타낸 가족성 Becker 형 근이영양증 1 예 보고
이재균(Jae Kyoon Lee),장재원(Jae Won Jang),임미경(Mi Kyeong Im),박광재(Kyang Jae Park),민영주(Young Joo Min),이상암(Sang Am Lee),김재중(Jae Joong Kim),박성욱(Seong Wook Park),박승정(Seung Jung Park),김유호(You Ho Kim),박종훈(Jong Hun 대한내과학회 1997 대한내과학회지 Vol.52 No.5
Dilated cardiomyopaty is a rare occurrence in Hecker muscular dystropy. We report a case of Bec- ken muscular dystrophy in 28 old man who presented with dyspnea, progressive muscle weakness, and dilated cardiomyopathy with severe left ventricular dysfunction which was detected by echocardiograpy. Muscle biopsy demonstrated diffuse degenerated changes consistent with progressive muscular dystropy, His brother has also Becker muscular dystrophy and dilated cardiomyopathy, The patient is on NYHA Class II~III with medical therapy.
비선형 동적 해석을 이용한 축하중과 폭발하중을 동시에 받는 철근콘크리트 부재의 구조 거동 분석
이승훈(Lee, Seung Hoon),이재균(Lee, Jae Kyoon),김한수(Kim, Han Soo) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구는 플랜트 내의 철근콘크리트 기둥 부재가 축하중과 폭발하중을 받을 때의 거동을 예측하기 위해 환산거리(Z)와 기둥의 축하중비의 변수를 적용한 비선형 동적해석을 수행하였다. In this paper, a nonlinear dynamic analysis was performed by applying variables of the scaled distance(Z) and the axial ratio of the column to predict the behavior of the reinforced concrete column member in the plant facilities under axial load and blast load.
식도Takayasu 동맥염 환자에서 동반된 크론병 1예
김해경,홍원선,민영일,정훈용,김해련,하현권,양석균,이재균,최재원,심기남,신은석 대한소화기내시경학회 1997 Clinical Endoscopy Vol.17 No.6
Vascular manifestations as extraintestinal symptoms of inflammatory bowel diseases have rarely been reported, More than 10 case reports in the worldwide literature have suggested that Takayasu's arteritis be one of the rare vascular complications in inflammatory bowel diseases. We describe herein a 33-year-old woman with Takayasu's arteritis who was subsequently found to have Crohn's disease. Aortic arch angiogram showed typical findings of Takayasu's arteritis, and the diagnosis of Crohn's disease was made by colonoscopic and radiologic findings, clinical course, and the response to medical therapy. To our knowledge, this is the first case report in Korea.
김해경,김명환,서동완,윤광희,유병무,민영일,공경엽,이재균,최재원,김연석,명승재,송병철,신은석 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.1
Biliary Papillomatosis is an extremely rare pathologic entity. Only about 40 cases of intrahepatic or diffuse intra- and extrahepatic papillomatosis have been described since the first report in 1959 by Caroli. Although this is a histologically benign lesion, its course is unfavaurable because of its tendency to extend to the entire biliary tract, high recurrence rate following local excision and the probability of progression to malignancy. We described herein a case of biliary papillomatosis associated with diffuse bile duct dilatation. The patient, a 59-year-old male, was admitted to our hospital because of right upper abdominal pain and weight loss. Cholangiogram revealed multiple round filling defects in common hepatic duct with intrahepatic bile duct dilatation. The patient underwent Whipple's operation with right lobectomy. Grossly, multiple small pin-head sized polypoid masses were seen in common bile duct, common hepatic duct and right intrahepatic duct. Microscapically, papillary epithelial hyperplasia with moderate cellular atypia was seen and there was no evidence of stromal invasion. He is healthy with a follow-up for 7 months.
김해경,김병식,김진천,홍원선,남승우,민영일,정훈용,김해련,하현권,양석균,이재균,최재원,오성태 대한소화기학회 1998 대한소화기학회지 Vol.31 No.1
Background/Aims: Small bowel tumors are uncommon accounting for only 3 to 6% of all gastrointestinal tumors. The diagnosis of small bowel tumors has been usually made at an advanced stage because of the infrequency and absence of symptoms specific for early diagnosis, resulting in poor prognosis. This study was conducted to investigate the clinical features of small bowel tumors in Korea. Methods: We reviewed and analyzed clinical manifestations, laboratory results and survivals in 63 patients with small bowel tumors diagnosed at the Asan Medical Center between June 1989 and January 1996. Results: Among 63 tuors reviewed, 58 were malignant tumors and 5 were benign tumors. The malignant tumors consisted of 25 adenocarcinomas, 15 malignant lymphomas, 12 leiomyosarcomas and 6 metastatic carcinomas. Adenocarcinomas were located mainly in the duodenum and malignant lymphomas in the ileum or duodenum, while leiomyosarcomas were evenly distributed. Clinical symptoms of these patients included abdominal pain (71.4%), palpable mass (12.7%), weight loss (10.0%) and bleeding (8.0%). Anemia and positive stool occult blood test were found in 55.0% and 46.7%, respectively. The median duration of symptoms before the diagnosis was 4 weeks in malignant tumors and 36 weeks in benign tumors. Twenty-seven of 30 patients (90.0%) with duodenal tumors were diagnosed by duodenoscopy, while small bowel series and CT scans detected 9 of 11 (82.0%) and 25 of 35 (71.4%) small bowel tumors, respectively. The incidence of metastasis to regional lymph nodes and distant organs was higher in adenocarcinoma and malignant lymphoma than leiomyosarcoma. The 2-year survival rates for patients with adenocarcinomas, malignant lymphomas, and leiomyosarcomas were 23, 57, and 60%, respectively. Conclusions: These results suggest that small bowel tumors should be considered in patients having unexplained abdominal pain, anemia, and/or positive stool occult blood test.