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허창재,김은영,김병석,한지민,정진태,권중구,김호각,오장석 대한소화기내시경학회 2009 Clinical Endoscopy Vol.38 No.6
특발성 장간막 정맥경화증은 매우 드문 질환으로 정맥 기원의 허혈성 대장염을 유발하며 증상의 호전이 어렵다. 이 질환의 병태생리는 확실치 않으며 장간막 정맥과 그 분지들의 섬유화, 유리질화 및 석회화를 동반한 대장벽의 비후를 특징으로 하며 만성 장간막허혈을 야기한다. 이병은 특징적인 방사선학적, 대장내시경적 및 조직학적 소견으로 진단할 수 있다. 우하복부의 통증 및 설사를 주소로 내원한 69세 여자의 단순 복부 촬영에서 대장 벽을 따라 실모양의 석회화를 관찰되었고 대장내시경검사에서 전대장에서 암자색을 띤 점막부종, 발적 및 얕은 궤양이 보였으며 조직검사에서 점막하층과 정맥벽에 심한 섬유화를 보였다. 바륨관장에서 상행대장 및 평행대장의 내강이 좁아져 있고 엄지손가락 누른 모양이 관찰되었고 전산화 단층촬영에서도 전 대장벽을 따라 석회화 및 장벽 비후소견과 장간막 정맥과 주름창자정맥의 석회화 소견이 보였다. 저자들은 국내에서 드물게 알려진 특발성 장간막 경화증으로 진단하고 보고한다. Idiopathic mesenteric phlebosclerosis (IMP) is a rare disease of chronic mesenteric ischemia characterized by a thickening of the colonic wall with fibrosis and calcification of the affected veins, which causes ischemic colitis. While the pathogenesis of IMP is unknown, characteristic radiographic, colonoscopic and histologic findings are evident. We report a case of IMP presenting with right lower abdominal pain and diarrhea in a 69-year-old woman. A plain abdominal radiograph revealed thread-like calcification in the colon. Colonoscopy showed dark purple-colored edematous mucosa and erosions in the colon. Histologic examination showed calcification in and around the submucosa and vascular wall. A barium enema demonstrated narrowing and thumb-printing from the ascending to the transverse colon. Abdominal CT disclosed a thickened colonic wall with intramural calcification and calcified mesenteric veins in the colon.
許昌宰 漢城大學校 1985 論文集 Vol.9 No.1
From the introduction and operation of the National Welfare Pension system in 1986, the volume of the trust fund depends on the cumulative difference between total receipts and benefit payment plus administration expenses. Taking several factors which can increase the volume of the National Welfare Pension Trust Fund, due to deferred benefit according to receipt over benefit payments, and the increase of employment with economic growth, the trust fund will be increased for several years. However, the amount of the annually receipts is governed by the size, the structure of the economy, the number of the issued sorts, of covered risks, and the structure of government expenditure. Thus, considered of savings as the difference between annual current receipts to finance the programs covered and the annual current expenditures, the level of savings will be expected to be mobilized for economic and social development in Korea by the National Welfare Pension system. In other words, National Welfare Pension Trust Fund seems to provide a net addition to national savings as a mean of mobilizing additional domestic savings for economic and social development with the capital formation. Thus, as the impact of trust fund on economic growth, the introduction and operation of the National Welfare Pension system in Korea can be considered as an effective mean for economic social development along with the balanced trust fund operation.
부식환경 조건을 고려한 부식촉진실험의 부식손상 수준과 부식전류량 비교
허창재(Chang-Jae Heo),하민균(Min-Gyun Ha),박찬현(Chanhyun Park),안진희(Jin-Hee Ahn) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.5
본 연구에서는 강구조물의 노출환경에 따른 상대적 부식열화 수준을 평가하기 위하여 도장의 내구성 평가에 사용되는 ASTM G85-19 실험방법을 이용한 부식촉진실험을 진행하였다. ASTM G85-19 실험방법을 이용한 부식촉진 실험에서 강구조물에 대한 상대적 노출환경 변화 조건을 고려하기 위하여 실험에 적용되는 염분농도와 황산암모늄 유무에 따른 환경조건별 촉진 시험편의 중량변화를 이용하여 평균부식두께 변화를 평가하였다. 또한 부식촉진 실험조건별 부식환경에 따른 부식전류를 확인하기 위하여 ACM 센서를 이용하여 부식촉진실험 조건별 부식전류량을 측정하였다. 부식촉진실험 결과 염분량과 황산암모늄과 같은 촉진실험 조건변화에 따라 평균부식두께는 1.1~2.7배, 부식전류량은 1.2~5.7배까지 변화되었음을 확인하였다. This study conducted an acceleration corrosion test based on ASTM G85-19 standards to evaluate the durability of both steel and paint-coating. The objective was to assess the relative corrosive deterioration based on variations in the corrosive environment. In the ASTM G85-19 test method, we systematically altered the concentration of chloride and (NH4)2SO4 to simulate different corrosive environmental conditions. The mean corrosion depth of the steel specimens was determined by quantifying weight throughout the acceleration cycle. Additionally, we measured the corrosion current output using the ACM sensor to validate the corrosive environmental condition corresponding to different acceleration cycle scenarios. Analysis of the results from the acceleration corrosion test revealed significant variations. The mean corrosion depth exhibited a range of 1.1 to 2.7-fold change, while the corrosion current showed fluctuations ranging from 1.2 to 5.7 times, contingent upon the conditions of the acceleration test, including the quantities of chloride and (NH4)2SO4 present.
허창재 ( Chang Jae Hur ),민보람 ( Bo Ram Min ),이유진 ( Yoo Jin Lee ),장병국 ( Byung Kuk Jang ),황재석 ( Jae Seok Hwang ),김은수 ( Eun Soo Kim ),박경식 ( Kyung Sik Park ),조광범 ( Kwang Bum Cho ),강유나 ( Yu Na Kang ),정우진 ( Woo 대한소화기학회 2015 대한소화기학회지 Vol.65 No.4
Background/Aims: Hepatic angiosarcoma, a rare and aggressive liver malignancy, is difficult to diagnose because of a lack of specific clinical features. The clinical and radiological features of patients with histologically confirmed hepatic angiosarcoma were examined. Methods: Among 2,336 patients diagnosed with primary hepatic carcinoma at Keimyung University Dongsan Medical Center (Daegu, Korea) between May 2002 and February 2012, eight (0.03%) with histologically confirmed primary hepatic angiosarcoma were included. The patterns of disease diagnosis, tumor characteristics, treatment responses, and prognoses were reviewed retrospectively. Results: Median age was 66 years-old (range, 41-80 years). Four patients were male. Five patients were compulsive drinkers. All patients had no HBsAg and anti-HCV. Initial radiologic diagnoses revealed primary hepatic angiosarcoma (n=2), hepatocellular carcinoma (n=2), hemangioma (n=2), and hepatic metastatic carcinoma (n=2). Definitive diagnoses were made by percutaneous needle biopsies in seven patients and surgical resection in one patient. At the time of the initial diagnosis, extrahepatic metastases were detected in three patients (37.5%). Metastatic sites included the spleen and lung, pericardium, and bone, in one patient each. Two patients underwent conservative treatments. The remaining patients underwent surgical resection (n=1), transcatheter arterial chemoembolization (n=1), and systemic chemotherapy (n=4). The median survival period was 214 days (range, 21-431 days). Conclusions: Hepatic angiosarcoma is a highly progressive disease with a poor prognosis. Detailed studies including histological examinations are essential to facilitate early diagnosis of the disease. (Korean J Gastroenterol 2015;65:229-235)
부식촉진실험을 통한 구조용 강재의 부식환경별 부식상태 평가
허창재 ( Heo Chang-jae ),유훈 ( Yoo Hoon ),하민균 ( Ha Min-gyun ),안진희 ( Ahn Jin-hee ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
일반적으로 강구조물의 내구성 확보를 위하여 강재 표면에 도장을 실시하고 있으나, 사용기간 증가와 부식환경에 영향을 받는 도막의 내구성 저하가 발생할 수 있다. 도막의 내구성 저하가 발생한 강구조물의 경우 부식환경 조건에 따라 강구조물의 부식손상을 발생시킬 수 있으므로 강구조물의 효과적인 유지관리를 위하여 부식환경 조건에 따른 강재의 상대적인 부식 상태를 확인할 필요가 있다. 따라서, 본 연구에서는 다양한 부식환경에 노출된 구조용 강재의 부식손상 상태를 부식촉진실험을 통하여 평가하였다. ASTM G85 Annex 5-Dilute electrolyte cycle fog/dry 기준의 부식환경조건과 화학적 요소를 변화시킨 부식환경조건에 대한 부식촉진실험을 진행하고 이에 따른 부식손상 상태를 비교하였다.