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평판형 고체산화물 연료전지의 유로 설계변수에 따른 성능비교를 위한 유동 해석 연구
이대호(Dae Ho Lee),손정락(Jeong Lak Sohn),노승탁(Sung Tack Ro) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Solid oxide fuel cell (SOFC) is expected to be a promising candidate for the power source in the next generation due to its high efficiency, utilization of high-temperature waste heat and low emission of pollutant to the environment. SOFC is, however, very sensitive to thermal stress because of its high operating temperature. In this study, three-dimensional CFD analyses are conducted to investigate the influence of flow pattern in the performance of a planar SOFC. Numerical results show that the temperature increases along the flow direction in the co-flow case and the temperature profile has a peak near the fuel inlet in the counter-flow case. Simulations of staggered flow channel model prove that overall performance is almost the same as that of unstaggered one although local distribution of current density is different.
증례 / 전신성 흥반성 루푸스 환자에서 발생한 거대세포바이러스 폐렴 1예
이대호(Dae Ho Lee),김진욱(Jin Wook Kim),신동현(Dong Hyun Shin),오명돈(Myoung Don Oh),송영욱(Yeung Wook Song),최강원(Kang Won Choi),이정상(Jung Sang Lee) 대한내과학회 1999 대한내과학회지 Vol.56 No.1
We report a case of cytomegalovirus(CMV) pneumonitis in a 21-year-old woman with systemic lupus erythematosus(SLE). She was diagnosed 3 years ago with lupus nephropathy and was on immunosuppressive therapy with prednisolone and cyclophosphamide. She developed dyspnea with fever and hypoxemia. Chest X-ray, and HRCT showed interstitial pneumonitis. We performed open lung biopsy. The diagnosis of CMV pneumonitis was made by the virus culture and immunohistochemical staining for CMV in lung tissue. Despite the admini stration of ganciclovir and high dose immunoglobulin therapy and assistance of mechanical ventilator, the patient died.
모야모야 병, 관상동맥 협착 및 확장형 심근병증을 동반한 말단비대증
이대호(Dae Ho Lee),김용주(Yong Joo Kim),이대배(Dae Bae Lee),박재홍(Jae Hong Park),정동진(Dong Jin Chung),정민영(Min Young Chung),이태희(Tai Hee Lee) 대한내과학회 2000 대한내과학회지 Vol.58 No.2
A 19-year-old girl with typical features of acromegaly, duration of which was thought to be above 10 years, presented with dyspnea. After serial studies, dilated cardiomyopathy and critical stenosis of left anterior descending coronary artery were demonstrated. Brain MRI revealed the following changes: the pituitary gland was enlarged and its upper margin was upwardly convex; severe cerebral atrophy and multiple signs of vascular abnormalities were present. Cerebral angiographic studies demonstrated the presence of complete occlusion of left carotid artery and severe stenosis of right carotid artery with the formation of collateral networks of vessels. The patient was thus diagnosed as having moyamoya disease that was thought to be congenital according to her past histories. Her cardiac function was slightly improved after percutaneous transluminal coronary angioplasty. Operation for the pituitary lesion and moyamoya disease was not performed due to poor general condition, but serum growth hormone concentration was adequately suppressed after octreotide therapy. We consider that this is a very rare case of acromegaly associated with moyamoya disease, coronary arterial disease and dilated cardiomyopathy.(Korean J Med 58:227-233, 2000)
이대호 ( Dae Ho Lee ) 대한내과학회 2014 대한내과학회지 Vol.87 No.3
Cancer immunotherapy has come a long way since William Coley observed that a mixture of killed bacteria, or Coley`s toxin, induced tumor regression. However, enthusiasm for cancer immunotherapy has changed to skepticism over recent decades due to its lack of efficacy, inconsistency, and significant toxicity. Of course, much of that skepticism was the result of a lack of understanding of the immune system. The recent expansion of our understanding of immunity and immune system and the success of new cancer immunotherapies has raised hope that we can treat cancer effectively via immunotherapy or combination approach using immunotherapy and other cancer therapies. Indeed, there is no doubt that cancer immunotherapy is experiencing a renaissance. Here, I will briefly review the current status of various immunotherapies, including cytokine therapy, antibody therapy, cancer vaccines, and adoptive cell therapy, and then I will summarize the results of recent clinical trials using anti-immune checkpoint monoclonal antibodies. (Korean J Med 2014;87:284-295)
프레임간 차를 이용한 교차로 영상에서 차량검지 및 추적 기법
이대호(Dae-Ho Lee),박영태(Young-Tae Park) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1B
지능형 교통 시스템(ITS)은 1) 도로의 상황 분석과 2) 위반 차량의 검지를 자동으로 수행하여 원활한 교통 제어를 제공하는 목적을 가지고 있다. 본 논문에서는 교차로에서 위반 차량을 검지하기 위하여 도로위의 차량을 검지하고 차량의 진행 경로를 추적하는 기법으로 주간에는 배경 영상을 사용하지 않고 프레임간의 차를 이용하여 차량의 움직임 정보를 추출하고 야간에는 전조등을 검출하여 차량을 추적하는 기법으로 주간의 경우 차량의 움직임만을 검지하므로 칼만 필터(Kalman Filter) 등에 의한 예측이 불가능하므로 현재 위치와 진행 방향으로 움직임 정보를 추적하는 기법을 제안한다. 제안하는 기법은 주간 그림자의 영향과 야간의 난반사의 영향을 제거할 수 있고 입력 영상을 320×240으로 축소하여 초당 10프레임 이상을 처리하므로 정확한 차량의 움직임을 추적할 수 있다.
Dipeptidyl Peptidase-4 (DPP-4) 억제제
이대호 ( Dae Ho Lee ) 대한내과학회 2014 대한내과학회지 Vol.87 No.1
Recent advances in incretin biology have led to the development of a new class of oral anti-diabetic drugs. To date, there are two known incretin hormones, glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), of which the former is a more important therapeutic target for type 2 diabetes. GLP-1 is secreted by intestinal L-cells in response to oral nutrient intake, and it stimulates insulin secretion and suppresses glucagon secretion in a glucose-dependent manner. However, both GLP-1 and GIP are rapidly degraded by dipeptidyl peptidase-4 (DPP-4), a multifunctional type II transmembrane glycoprotein. Thus, several DPP-4 inhibitors with different pharmacologic features are now available and can be used either as monotherapy or in combination with other anti-diabetic agents for the treatment of type 2 diabetes. In both therapeutic regimens, DPP-4 inhibitors have been shown to reduce hemoglobin A1c levels by approximately 0.5-0.8%. In clinical trials, DPP-4 inhibitors were generally well-tolerated, posed a low risk of hypoglycemia, and did not increase body weight. Despite some reports of a possible increased risk of pancreatitis with GLP-1 receptor agonists and DPP-4 inhibitors, no causal associations have been found. Recent randomized controlled clinical trials have shown that DPP-4 inhibitors did not increase or decrease the rates of major adverse cardiovascular events in patients with type 2 diabetes at high risk of cardiovascular disease, even though this class of anti-diabetic agents had various salutary effects in many studies involving animals or healthy and diabetic humans. Additional studies will be required to resolve these disparate conclusions. (Korean J Med 2014;87:1-8)