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박상신,김규하,이진갑,Park, Sang-Shin,Kim, Gyu-Ha,Lee, Jin-Kab 한국트라이볼로지학회 2007 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.23 No.3
This paper presents measurement processes of rotational accuracy and comparison of theoretical values in the main bearing of scroll compressor. The main bearing is a type of oil journal bearing, but it has an axial or helical groove. The generalized coordinate system method, which can handle this groove, is applied to calculate the pressure profile in the journal bearing. The orbits of journal shaft are calculated corresponding to the compressed gas forces and bearing reaction forces. Then, the orbits are measured using three-point method. The results are compared to that from analyses.
박상신,김민,Lee Dae In,이주희,김상민,Lee Sang Yeub,배장환,황경국,김동운,조명찬,배대환 대한중환자의학회 2024 Acute and Critical Care Vol.39 No.1
The main mechanism of Takotsubo cardiomyopathy (TCM) is catecholamine-induced acute myocardial stunning. Pheochromocytoma, a catecholamine-secreting tumor, can cause several cardiovascular complications, including hypertensive crisis, myocardial infarction, toxic myocarditis, and TCM. A 29-year-old woman presented to our hospital with general weakness, vomiting, dyspnea, and chest pain. The patient was nullipara, 28 weeks’ gestation, and had a cachexic morphology. Her cardiac enzyme levels were elevated and bedside echocardiography showed apical akinesia, suggesting TCM. The next day, she could not feel the fetal movement, and an emergency cesarean section was performed. After delivery, the patient experienced cardiac arrest and was transferred to the intensive care unit for cardiopulmonary resuscitation (CPR). Spontaneous circulation returned after 28 minutes of CPR, but cardiogenic shock continued, and extracorporeal membrane oxygenation (ECMO) was initiated. On the third day of ECMO maintenance, left ventricular ejection fraction improved and blood pressure stabilized. On the eighth day after ECMO insertion, it was removed. However, complications of the left leg vessels occurred, and several surgeries and interventions were performed. A left adrenal gland mass was found on computed tomography and was removed while repairing the leg vessels. Pheochromocytoma was diagnosed and left adrenalectomy was performed.
극소 공기막을 갖는 공기베어링의 직접수치해법을 이용한 정적해석
박상신,장인배,황평,한동철,Park, Sang-Sin,Chang, In-Bae,Hwang, Pyung,Han, Dong-Chul 대한기계학회 1991 대한기계학회논문집 Vol.15 No.1
본 연구에서는 Kawabata가 제안한 직접수치해법(direct numerical solution method)을 확대하여 윤활표면으 국부 회소가스 효과(local rarefaction effect)로 인 한 공기분자의 벽면 미끄름 현상을 고려한 지배방정식을 Navier-Stokes방정식으로 부 터 유도하고 이를 2차원 유동의 경우까지 확대하여 극소틈새와 높은 압축성 계수를 갖 는 경우에 적용하고 그 결과를 기존의 수정된 레이노래즈 방정식의 해석결과와 비교하 고자 한다. An expanded scheme of a direct numerical solution method for solving the Navier-Stokes equation considering the modified boundary conditions for gas lubrication with ultra low clearance at high .LAMBDA. region is presented. Many examples are calculated by this scheme and their results are compared to the previous solutions using P$^{2}$H$^{[-992]}$ . This scheme has the advantages of fast calculation time and stable convergence in high .LAMBDA. region, and gives very good results in the case of fluid film thickness discontinuity.
백내장과 대사증후군의 관련성-2005, 2007년 국민건강영양조사 이용
박상신,이은희 한국안광학회 2009 한국안광학회지 Vol.14 No.3
Purpose: This study was performed to assess the effects of metabolic syndrome and its components to cataract. Methods: We investigated the relation of metabolic syndrome and its components to cataract using data for 2,120 adults, aged 60 years or older, from the Korean National Health and Nutrition Examination Survey 2005, 2007. Using multiple logistic regression analysis, we presented significant odds ratio (OR) increase of cataract according to the number of metabolic abnormalities (1, 2, 3, 4). We also analyzed OR by the prevalence of metabolic components, and analyzed the effects of metabolic medication intakes to cataract prevalence using multiple logistic regression analysis. Results: The risk of cataract development was significantly increased according to the number of metabolic abnormalities, after adjusting for age, sex, life style, and social economic status variables (p for trend <0.0001). In metabolic components, the disturbances of blood pressure (OR(95% Confidence Interval): 1.32(1.05,1.65)) and fasting glucose (1.35(1.09,1.67)) significantly increased the prevalence of cataract after adjusting for age and sex. Among these metabolic components, the significance of fasting glucose (1.26(1.01, 1.58)) was remained after adjusting for the other variables. Medication intake of hypertensive also increased the risk of cataract (1.49(1.14,1.96)). Conclusions: Metabolic syndrome and its components increased the risk of cataract, and some medication for treating hypertension was also associated with the cataract incidence. 목적: 백내장에 대사증후군 및 그 구성요소가 어떠한 영향을 미치는지 알아보고자 본 연구를 수행하였다. 방법: 2005, 2007년의 국민건강영양조사 자료를 이용하여 대사증후군 및 구성요소와 백내장과의 관계를 분석하였다. 이를 위해 본 연구에서는, 60세 이상의 성인 2,120 명을 대상으로 대사증후군 이상인자의 수(≤1, 2, 3, ≥4) 에 따른 백 내장 발생의 위험도(Odds ratio: OR)를 살펴보고, 대사증후군 관련치료제가 백내장에 미치는 영향 또한 다중 로지 스틱 회귀분석으로 분석하였다. 결과: 대사증후군의 구성요소를 하나도 가지지 않은 대상자를 기준으로 하고, 성, 연 령, 생활습관변수 및 사회경제적 변수를 보정했을 때 보유하고 있는 대사증후군의 구성요소가 늘어날수록 백내장의 위험도는 더욱 커지는 경향을 보였다(p for trend <0.0001). 또한, 대사증후군 요소 중 혈압(OR(95% Confidence Interval): 1.32(1.05,1.65))과 공복혈당(1.35(1.09,1.67))에 이상이 있는 경우는 성과 연령을 보정한 후에도 백내장의 위험을 유의하게 증가시키는 것으로 나타났다. 그 중 공복혈당장애의 경우는 앞서 보정한 변수에 사회경제적 변수 를 함께 보정하여도 백내장 발생에 유의미한 위험도(1.35(1.09,1.67))를 나타내었다. 대사증후군이 있는 경우에도 동 일한 보정 후에 백내장에 대한 유의한 위험도(1.26(1.01,1.58))를 보였다. 마지막으로 높은 혈압이 있는 대상자들을 대상으로 시행된 분석에서, 고혈압 치료제의 경우 백내장의 위험도(1.49(1.14,1.96))를 증가시키는 것으로 나타났다. 결론: 대사증후군 및 그 구성요소는 백내장 발생의 위험을 높이는 것으로 확인되었고, 고혈압 치료제의 경우도 백 내장의 위험도를 높이는 것으로 추정된다.