• Proceeding of EDISON Challenge
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• 2015.03a
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• pp.575-579
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• 2015

본 연구에서는 스파이럴 보강을 한 원형 실린더 주위의 유동를 분석하였다. 이를 위해 스파이럴 보강 부분을 사각형 부착물로 분리해서 나타내었다. EDISON_CFD의 가상 경계법을 이용하여 원형 실린더와 부착물 주위의 유동 현상을 해석하였다. 부착물의 두께와 각도를 다르게 하여 각각의 공력 계수와 총 합력을 구하고 이에 따른 특성을 분석하였다.

• Proceedings of the Korean Nuclear Society Conference
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• 1995.05a
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• pp.687-692
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• 1995

중수로용 핵연료봉의 주요 파손부위는 피복관 원주방향 주름부위와 봉단마개-피복관 용접 부위로 알려져 있다. 중수로용 개량핵연료인 CANFLEX 핵연료 개발시, 이러한 핵연료봉 부위들에 대한 건전성이 입증되어야 한다. 이에따라 CANFLEX-NU 핵연료봉의 피복관 원주 방향 주름부위 및 피복관-봉단마개 용접부위에 대한 정상상태 운전시의 건전성을 평가한 결과, 정상상태 운전시는 핵연료봉의 건전성이 유지가 됨을 알 수 있었다.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.175-180
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• 1998

중수로에 0.88 w/o 의 순환 핵연료를 사용하여 기존 중수로의 출력을 증강시키는 방안이 모색되었다. 기존 중수로와 양립하여야 하므로, 37봉 핵연료 다발과 CANFLEX 핵연료다발에 대한 격자 특성 계산과 노심 계산을 수행하였다. 열수력 여유도 증가와 고연소도 핵연료를 위하여 개발한 개량 핵연료 (CANFLEX)를 사용하면 원자로의 임계채널출력 (CCP)이 5 % 이상 증대하므로, 기존 원자로의 총 출력을 같은 열수력 한계 내에서 5 % 증가시킬 수 있다. 또한 개량 핵연료 다발에 순환우라늄을 사용하면 기존 월성 원자로의 구조 변화 없이 노심 출력분포의 재 분포에 의하여 15 % 까지 출력을 증강할 수 있다고 평가되었다.

• Journal of Chest Surgery
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• v.18 no.4
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• pp.563-568
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• 1985

Two cases of situs inversus totalis with isolated congenital heart disease were treated at department of cardiothoracic surgery, Chungnam National University Hospital. Sixteen months old girl was operated under diagnosis of PDA with mirro-image dextrocardia by triple ligation. Fifteen months old girl was managed under diagnosis of VSD with mirro-image dextrocardia by simple closure of VSD with extracorporeal circulation. The former had smooth postoperative course, but the latter was died of asphyxia due to vomitus on postoperative second day

• Tuberculosis and Respiratory Diseases
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• v.57 no.5
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• pp.489-493
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• 2004

Unilateral pulmonary artery agenesis is a rare congenital anomaly usually associated with other cardiovascular anomalies such as tetralogy of Fallot or septal defect. Unilateral pulmonary artery agenesis without other coexisting cardiovascular abnormality (isolated unilateral pulmonary artery) is extremely rare and often asymptomatic until adulthood. In these patients, diagnostic clue is found in a plain chest roentgenogram, showing a hyperlucent contracted hemithorax. We have recently experienced a case of isolated right pulmonary artery agenesis, which was diagnosed by chest dynamic CT, perfusion scan, echocardiogram and 3-dimensional reconstruction cardiac CT angiography in a 50-year old female who had suffered from mild dyspnea on exertion and improved with conservative treatment. We report this case with a brief review of the relevant literature.

• Polymer(Korea)
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• v.27 no.3
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• pp.242-248
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• 2003

PP-g-(AN/Sty) was synthesized by grafting with acrylonitrile (AN) and styrene (Sty) onto PP staple fiber using an electron beam accelerator and followed by amidoximination and phosphorylation. Mole fraction of AN in the graft chain increased with the increase of the AN content in the monomer mixture. The highest AN grafting yield of 45% was obtained at a monomer ratio of 40 vol% AN/60 vol% Sty. Mole fraction of AN in the graft chain decreased with the increase of methanol amount used its solvent. As reaction temperature increased, the grafting yield of copolymer increased and reached equilibrium at 50$^{\circ}C$. Amount of amidoxime group in fibrous ion exchanger was increased as increasing amount of hydroxylamine, and the maximum content of amidoxime group was observed at 5.8 mmol/g with the 9 wt% hydroxylamine concentration. Content of phosphorous group in fibrous ion exchanger increased up to 0.5 N phosphoric acid concentration, and then leveled off. The adsorption ability of the copolymer for uranyl ion by the chelating adsorbents was in the following order : bifunctional PP-g-(AN/sty) > amidoximated PP-g-(AN/Sty) > phosphorylated PP-g-(AN/Sty).

• Journal of Chest Surgery
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• v.38 no.11 s.256
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• pp.780-782
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• 2005

The quadricuspid aortic valve is a rare congenital cardiac morphology. In regard to the hemodynamics of the quadricuspid aortic valve, the regurgitation is most common, the regurgitation accompanying the stenosis or pure stenosis are rare. We report hear a case with quadricuspid aortic valve disease which has been known to be extremely rare.

• Journal of Chest Surgery
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• v.41 no.4
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• pp.499-503
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• 2008

Berry syndrome (a distal aortopulmonary window and a right pulmonary artery originating from the ascending aorta, an intact ventricular septum, a patent ductus arteriosus and an interrupted aortic arch) is a rare complex congenital cardiac malformation. We describe a case of one stage repair with using an autologous arterial flap in a 19-day-old neonate who was suffering with this malformation, and we report on the development of postoperative right pulmonary artery stenosis and its successful management with performing multiple balloon angioplasties.

• Journal of Chest Surgery
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• v.30 no.1
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• pp.88-91
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• 1997

Congenital long-segment tracheal stenosis with complex cardiac anomaly has generally been regarded as a fatal disease This report described the successful concomitant repair of unexpected congenital tracheal stenosis and complex cardiac anomaly with the use of edrdiopulmonary bypass. The patient was a 3-month-old girl with coarctation of aorta, V D, and PDA. The presence of tracheal stenosis was not discovered until when difficulty with endotracheal intubation was encountered at operating room. Thus, we decided concomitant repair of both lesions and performed anterior pericardial tracheoplasty combined with one stage repair of coarctation of aorta, VSD, and PDA under the cardiopulmonary bypass. The patient is doing well without any signs of complication at present, 2 years and 1 month after the operation.

• Journal of Chest Surgery
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• v.30 no.12
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• pp.1175-1183
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• 1997

Background. Infective endocarditis s an uncommon but serious disease in children. Optimal treatment strategy, especially surgical indications, continues to evolve. Method. In this report, we retrospectively reviewed 19 patients who underwent operations in Seoul National University Children's Hospital for infective endocarditis between September 1986 and February 1996. There were 8 male and 11 female patients(mean age 70.6 months) and their main symptoms were fever and dyspnea. Preoperative echocardiography detected vegetation in 14 cases out of 19. Congenital anomalies were in 15 cases and acquired forms were in 4 cases. Causative organisms were identified in 12 cases and Gram-positive cocci were in 7 cases. Adequate preoperative antibiotic management was done. Result. With cardiopulmonary bypass in all cases, surgical corrections including vegetation removal were performed. 4 patients died after operations(21.1%). All the mortality cases were having underlying complex cardiac anomalies. There were no late deaths. Act arial survival rate was 79.0% at 1 year and 79.0% at 5 year and reoperationfree survival rate was 73.7% at 1 year and 73.7% at 5 year. Collclusion. Despite advances in antibiotic therapy, early surgical treatment is imperative in a significant subset, and concurrent intracardiac repair should be appropriate.