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디젤차량의 난방성능 개선을 위한 PTC 히터적용에 관한 연구
김선원(Sunwon Kim),조광운(Kwangwoon Cho),박용재(Yongjae Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Recently-increasing demands for diesel engine in the market make an auxiliary heater essential in a passenger car because the fuel-efficient diesel engine does not dissipate enough heat to coolant to warm up the passenger compartment with a single conventional heater at the cold start A PTC heater is becoming a good solution because of its quick heating performance and safety. In this study, we installed a PTC heater in a passenger car and reliability and safety in a car were tested. The heating performance and detfosting performance were also comparatively tested with a glow heater. The result shows that the PTC heater is not a potential source of danger and the heating performance of the PTC heater is superior to that of the glow heater.
김선원(Sunwon Kim),박차식(Chasik Park),박용재(Yongjae Park) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
In recent years, concern among car users regarding vehicle air quality has been increasing. Air pollution and emission cause car users to be uncomport. Pollen and diesel vehicle exhaust gases entering the cabin and smoke firm fellow passengers not only reduce air quality in the vehicle, but also harmful to the health. Therefore, we developed products improving vehicle air quality, include filers for cleaning polluted air and emission gas coming in from the outside and deodorizing smoke from inside
탄소섬유 산화 현상을 고려한 탄소복합재료의 섬유체적비 측정법
김윤호 ( Yunho Kim ),( Sathish Kumar ),최충현 ( Chunghyeon Choi ),김천곤 ( Chungon Kim ),김선원 ( Sunwon Kim ),임재혁 ( Jaehyuk Lim ) 한국복합재료학회 2015 Composites research Vol.28 No.5
섬유체적비에 따라 복합재료의 기계적 열적 특성이 크게 달라지기 때문에, 복합재료 설계시 섬유체적비를 올바르게 측정하는 것이 매우 중요하다. 일반적으로 섬유체적비를 측정하는 여러 방법은 산화되지 않는 유리섬유나 세라믹섬유를 사용한 복합재료의 경우에는 적합하고 효율적이다. 하지만 산화현상이 있는 탄소섬유의 경우에는 산화 방법과 조건에 따라서 다른 결과를 가져오게 되며 그러므로 올바른 섬유체적비를 측정이 어렵다. 본연구에서는 Thermogravimetric analysis를 수행하여 산화되는 탄소섬유의 질량 감소량을 보정하여 탄소섬유 복합재료의 섬유체적비를 측정하였고 현미경 단면 이미지를 이용하여 그 결과를 검증하였다. Measuring fiber volume fraction properly is very important in designing composite materials because the fiber volume fraction mainly determines mechanical and thermal properties. Conventional Ignition methods are effective for ceramic fiber reinforcing composite materials. However, these methods are not proper for applying to carbon fiber reinforcing composites because of the venerable characteristic against oxidation of carbon fiber. In the research, fiber volume fraction of carbon fiber composites was obtained by a thermogravimetric analysis considering oxidation characteristic of the carbon fiber and the method was compared and verified with the results from microscopic cross section images.
김경호 ( Kyung Ho Kim ),신재경 ( Jae Kyoung Shin ),김선원 ( Sunwon Kim ),조우희 ( Woo Hee Cho ),김성순 ( Sung Soon Kim ) 대한내과학회 2017 대한내과학회지 Vol.92 No.1
타카야수동맥염의 발병 원인은 확실히 밝혀져 있지 않지만, 염증성 질환의 하나로 판단되며 이에 결핵 항원에 대한 자가면역 반응이 타카야수동맥염의 병인으로 제기되고 있다. 저자들은 타카야수동맥염이 좌측 신동맥을 침범하여 이차성 고혈압이 발생하고 활동성 폐결핵이 동반된 환자를 치료하여 보고하는 바이다. Takayasu`s arteritis (TA) is an inflammatory disease involving large arteries and their branches. The etiology of TA is unknown, but infectious agents and genetic factors play a significant role in its pathogenesis. A relationship between TA and Mycobacterium tuberculosis infection has been suggested, since both diseases have similar chronic inflammatory lesions and the presence of occasional granulomas in arterial walls. Patients with TA have an increased immune response to Mycobacterium tuberculosis antigens, suggesting a role for this organism in the immunopathogenesis of the disease. Herein, we present a case of TA with active pulmonary tuberculosis in a Korean patient. A 21-year-old male presented with hypertension and active pulmonary tuberculosis. TA invading the renal artery was diagnosed while evaluating hypertension. The patient was treated with prednisolone, methotrexate, anti- hypertensive medications, and anti-tuberculosis medications. (Korean J Med 2017;92:66-69)