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온도에 따른 집광형 태양전지의 성능에 관한 실험적 연구
신재혁(Shin Jae Hyuk),이승신(Yi Seung Shin),김상민(Kim Sang Min),부준홍(Boo Joon Hong) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
An experimental study was conducted to investigate the performance of a concentrating photovoltaic cell(CPV) against temperature. It is know that a high efficiency of a CPV can be achieved only with proper cell temperature as well as high concentration ratio (CR). This study is concerned with appropriate cooling condition for a liquid-convection cooler for the best performance of a specific CPV. A series of experiments was conducted in a range of cell temperatures as a result of varying cooling conditions, while the concentration ratio was 390 and the solar irradiation flux was higher than 900W/m2 in outdoor environment. The CPV had a planar dimension of 10 by 10mm. A Fresnel lens was used as a concentrator, of which the dimension was 221 mm(W) X 221 mm(L) X 3mm(t) and the transmissivity was known to be 0.8. The cooler was attached to the bottom side of the CPV and had a contact area of 21 mm(W) X 26 mm(L), which was identical to the size of the base plate of the CPV. The coolant temperature was controlled by an isothermal bath and the flow rate was controlled and measured by a flowmeter. The experimental results showed that the average of power efficiency of the CPV decreased from 28.6 % to 24.7 % as the cell temperature increased from 36℃ to 97℃. An appropriate cooling method of a CPV might increase the power conversion efficiency by about 4% for the same concentration ratio. Discussion is included from the viewpoint of the combined efficiency in a ddition to the power efficiency.
상완골 근위부 골절에서 근위 상완 골수정 삽입술 이후 발생한 골수정 주위 골절 및 기능성 보조기를 이용한 치료 -증례 보고-
신재혁 ( Jae Hyuk Shin ),장호근 ( Ho Guen Chang ),김영우 ( Young Woo Kim ),이남규 ( Nam Kyou Rhee ),박용복 ( Yong Bok Park ),김용국 ( Yong Kuk Kim ) 대한골절학회 2011 대한골절학회지 Vol.24 No.2
상완골 근위부 골절로 골수정 삽입 이후 발생한 골수정 주위 골절에 대한 증례 보고는 매우 드물고, 치료방법 또한 확립되어 있지 못하다. 상완골 근위부 골절 치료 시 근위 상완 골수정을 이용한 수술 결과에 대한 많은 보고가 있으나, 술 후 발생하는 중대한 합병증에 대한 보고는 많지 않다. 26세 여자 환자의 상완골 근위부 골절에서 근위 상완 골수정을 이용한 비관혈적 정복술 및 내고정술을 성공적으로 시행받고 술 후 4개월 기구 원위부로 골수정 주위 골절이 합병된 1예를 보고하고자 한다. 치료로는 U-형 부목, 현수 석고 및 팔걸이, 그리고 기능적 보조기를 차례로 적용하여 성공적인 결과를 보였다. 상완골 근위부 골절 시 근위 상완 골수정은 저에너지 손상에 의하여 골수정 주위 골절을 유발시킬 수 있기에, 적극적 운동에 가담하는 젊은 연령의 환자에서는 주의가 요한다고 보여진다. Periprosthetic fracture following a proximal humeral intramedullary (IM) nailing is rarely reported neither for its occurrence nor for its treatment. Proximal humeral IM nail (Acumed, LLC, Hillsboro, OR, USA) has been increasingly reported of its successful treatment outcomes, yet there is paucity of data describing its complications. Here we report a 26 year-old female patient, who sustained a proximal humerus fracture which was initially successfully treated by proximal humeral IM nail, and was complicated by a periprosthetic fracture distal to the nail tip at postoperative 4 months. Serial application of U-shaped coaptation splint, hanging cast, and functional bracing resulted in satisfactory clinical outcome. Periprosthetic fracture after proximal humerus IM nail can occur by a low energy injury, which need to reminded in treating young and sports-active patients.
변형된 Classification Tree Method를 이용한 BLDC 모터제어기 파괴 시험
신재혁 ( Jae Hyuk Shin ),정기현 ( Ki Hyun Chung ),최경희 ( Kyung Hee Choi ) 한국정보처리학회 2014 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.3 No.6
In this paper, we propose a test case generation method adequate to destructive test of the BLDC(Brush Less Direct Current) motor controller used for the MDPS(Motor Driven Power Steering) system embedded in an automobile. The proposed method is a modified CTM(Classification Tree Method). CTM generates test cases assuming that all inputs are equally important. Therefore, it is very hard to generate test cases for extreme situations. To overcome the drawback and generate test cases specialized for destructive test. a modified CTM that compensates the limitation of traditional CTM is proposed. The proposed method has an advantage that it can intensively generate the test scenarios adequate to extreme situations by combining the test cases generated by the transitional CTM the while keeping the merit of the traditional CTM. The test scenarios for destructive test for the MDPS system embedded in a commercial automobile are generated utilizing the proposed method. The effectiveness of the proposed algorithm is verified through the test.
『비급구법(備急灸法)』중『천금방(千金方)』인용문(引用文)에 대한 고찰(考察)
신재혁 ( Jae Hyuk Shin ),송지청 ( Ji Chung Song ),정현종 ( Hyun Jong Jeong ),이시형 ( Shi Hyung Lee ),엄동명 ( Dong Myung Eom ) 대한한의학원전학회 ( 구 대한원전의사학회 ) 2010 대한한의학원전학회지 Vol.23 No.5
『Beijijiufa』is a book written by Wenrenqinian, 1226, Song dynasty. It provides moxibustion on acute disease. However, the book is composed with quotations by other authors such as Gehong, Zhenquan, Sunzhenren, Hwangdi Qibo and others. Sunzhenren is a dominant author out of them by quotations. 14 diseases out of 22 in acute disease, is quoted in 『Qianjinfang』of Sunzhenren. I will compare texts of 『Beijijiufa』with 『Qianjinfang』and try to figure out differences between them just like text itself, methods of treatment, moxibution point, number of points, case of male or female and so on. As a result, comparing with 『Qianjinfang』, 『Beijijiufa』has somehow new opinions about acute disease by moxibution in methods of treatment, moxibution point, number of points, case of male or female etc., even if it referred 『Qianjinfang』.
생산 초기 초음속 항공기 조종석의 고품질 공기 확보를 위한 burn-in test 연구
신재혁(Jae Hyuk Shin),박성제(Sung Jae Park),서동연(Dong Yeon Seo),정수헌(Suheon Jeong) 한국항공우주학회 2016 韓國航空宇宙學會誌 Vol.44 No.10
생산 초기의 초음속 항공기는 블리드 에어 덕트에 존재하는 생산용 자재의 부가 물질이 가열될 경우 조종실에 타는 냄새와 유사한 비정상적인 냄새가 조종실로 유입된다. 조종사가 이와 같은 냄새를 엔진의 화재와 같은 비상 상황으로 오인하는 것을 방지하기 위해 비정상적인 냄새의 원인 물질은 시험 비행 전에 burn-in test를 통해 제거되어야 한다. 그러나, 현재의 절차의 최고 온도보다 고고도 비행의 최고 온도가 더 높기 때문에 냄새를 완벽히 제거 할 수 없다. 본 논문은 고고도 비행의 열적 상황을 분석하여 개선된 burn-in test 절차를 제시한다. 비연속적인 유량 조절, 단위 시간당 높은 온도 변화율, 응축기와 터빈의 한계 온도 차이 때문에 현재의 절차로는 고고도 조건을 모사하지 못하는 것이 확인되었다. 이러한 한계를 극복하기 위해 램에어 입구 제어를 통해 연속적 유량 조절이 가능한 burn-in test 절차를 제시하였다. 제시된 방법을 통해 블리드 에어 온도가 지상에서 고고도 비행 조건 이상임을 확인하였으며, 비행 시험을 통해 비정상적인 냄새를 제거할 수 있음을 검증했다. Abnormal odor similar with burning smell often appears at the cockpit in the beginning of ultra-sonic aircraft without air filter due to the heating of production materials remained at the bleed air duct. Sources of the odor should be removed by burn-in test before test flight in order to prevent pilot confuses order with emergency such as fire of engine. However, the present method cannot prevent abnormal odor completely at the high altitude flight because maximum temperature of flight is higher than it of burn-in-test. This paper suggests burn-in test improved based on the analysis of thermal conditions of high altitude flight. It is verified that the existing burn-in test cannot cover thermal conditions of high altitude flight due to the discontinuous flow control, high change rate of temperature per unit time and difference between limit temperature of condenser and turbine. In order to overcome the limitations of current methods, the new burn-in test with continuous flow control are suggested. The continuous flow control are achieved by ram air inlet control. The effect of suggested method are verified by ground tests and flight tests. The results show the bleed air temperature can cover the temperature of high altitude flight and prevent abnormal odor at the flight test.
외상성 수지 허혈 괴사에 대한 Prostaglandin E1 보존 치료에 의한 구제치료 - 증례 보고 -
신재혁 ( Jae Hyuk Shin ),장호근 ( Ho Guen Chang ),양철중 ( Cheol Jung Yang ),안정태 ( Jungtae Ahn ) 대한골절학회 2015 대한골절학회지 Vol.28 No.4
Prostaglandin E1 (PGE-1) is a potent vasodilator, which also inhibits platelet aggregation, affects the blood flow viscosity, and fibrinolysis. The compound also excerts anti-inflammatory effects by inhibiting the monocyte and neutrophil function. PGE-1 has been widely administered following microvascular flap surgery, along with perioperative antithrombotic agents such as low molecular weight heparin or aspirin, showing excellent results. We report a case showing successful salvage recovery from post-traumatic ischemic necrosis of the finger via PGE-1 assisted conservative treatment.