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자동차용 전자식 수온조절기의 감온성능 향상을 위한 그래핀 소재의 적용
김서규(SeoKyu Kim),김용정(YongJeong Kim),정희화(Heehwa Joung),전원일(Wonil Jeon),정진우(Jinwoo Jeong),정수진(SooJin Jeong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
In this work, graphene platelets were introduced into wax of automotive electronic controlled thermostat for the purpose of enhancing the thermal-conductive and improving response performance. Graphene content in ranging from 10 to 20% was added into and mixed with wax for investigating the effect of graphene contents on the performance of automotive electronic controlled thermostat in terms of response time, hysteresis and melting temperature. The experimental results revealed that graphene content in wax contributed to a reduction of response time and hysteresis of automotive electronic controlled thermostat. As a consequence, important improvement in thermal sensitivity , full lift, melting temperature and hysteresis were obtained. We hope that this study may help further the translation of nano-fluid technology from small-scale research laboratories to industrial application in the automotive sector.
자궁에 발생한 혈관외피세포종 ( Hemangioangiopericytoma ) 의 1예
김서규(SK Kim),이홍균(HK Lee),최근혜(GH Choi) 대한산부인과학회 1975 Obstetrics & Gynecology Science Vol.18 No.9
47세의 경산부에 발생한 자궁경부의 혈관외피세포종(hemangiopericytoma) 1례를 치험한 바 그 증례보고 및 간단한 문헌고찰을 실시하였다. A case of Uterine hemangiopericytoma is reported in a 47 year-old multiparous woman with a brief review of the literature.
수온조절기의 개변온도가 가솔린 차량의 연비 및 배출가스에 미치는 영향
김서규(SeoKyu Kim),이검수(GumSu Lee),정진우(Jinwoo Jeong),정수진(SooJin Jeong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Engine thermal management system(TMS) are gaining attention in engine development and calibration to achieve low fuel consumption to achieve low fuel consumption and meet future emission regulation. One of the major TMS strategy for improving fuel economy is operating the engine in high temperatures. Operating the engine in high temperatures not only decrease hydro dynamic friction losses but also decreases the heat flux from combustion chamber to coolant fluid which in turn results in higher overall engine efficiency. This work examines the effect of two different STO(Starting Temperature of Opening) of wax-thermostat, 90℃ and 100℃ of gasoline engine on fuel economy and emission characteristics. In this work, a gasoline SUV car equipped with wax-thermostat was tested under FTP-75 and HWFET mode to examine how thermal condition changes by different STO of thermostat affects fuel consumption and emission characteristics. The test results show for both drive cycles fuel saving due to the application of operating the engine in high temperature by high STO of thermostat is relatively small and amounts between 0.34% and 0.48%. It is also found that the amount of HC and CO emissions from tailpipe tends to decrease with higher engine coolant temperature because of faster catalyst light-off and improved combustion. For further detail investigation, the application of physically based system level computational model will be strongly required.
김서규(Seo-Kyu Kim),정규성(Gyu-Sung Jung),이창범(Chang-Bum Lee),박래홍(Rae-Hong Park),김상중(Sang-Jung Kim) 한국정보과학회 1989 정보과학회논문지 Vol.16 No.3
이치 영상은 입력 데이타의 특성과 관계없이 입력 데이타의 조명조건이나 영상취득 장치 자체의 특성때문에 점이나 작은 얼룩과 같은 불규칙잡음을 보인다. 본 논문에서는 참고 논문[5]와 contour check 다수 논리 평활화를 결합하고 영상의 특성을 이용하여 얇은 선을 보존하면서 잡음요소를 효율적으로 제거하는 고속 이치 영상 잡음제거 알고리즘을 제안하였다. 이러한 잡음제거 알고리즘을 G4 FAX 코딩시 압축율의 증가를 가져온다. 또한 제안된 방법은 매우 빨라서 거의 실시간처리가 가능하다. 컴퓨터 모의실험 결과 제안된 방법은 계산시간의 복잡성과 잡은 제거시 얇은 선의 보존 성능면에서 기존의 방법보다 우수한 성능을 나타냄을 보였다. Binary images sometimes show the random noisy dots and blobs, which are independent of the input data, depending on the illumination condition of the input data and characteristics of an image acqusition system itself. We propose the fast enhancement algorithm of binary images that smooths out noise while preserving thin contours. In this algorithm, we combined the [5] and majority logic smoothing with contour check and considered the input image characteristics. It also increases the data compression ratio for image data based on the G4 facsimile encoding schemes. The proposed algorithm is fast enough to be applicable to nearly real-time services. Computer simultion shows that the proposed method gives better performance than the existing methods in terms of the computational complexity and the effectiveness of the noise reduction with preserving thin contours.
MEMS(MicroElectro Mechanical Systems) 기술로 제작된 VDC(Vehicle Dynamics Control)용 자이로스코프 어레이
김서규(Seokyu Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
This paper presents a gyroscope array with capacitive detection fabricated by MEMS technology. Proposed gyroscope array has comparative advantage in sensitivity, electromechanical noise, and shock survival. Also the number of the gyroscope array can be expandable to the number of n²cells. We test the resonance frequency characteristics of 1, 4, and 9 cells gyroscope array. A quad-cell gyroscope array performance was tested on the rate table within a vacuum chamber. The quad-cell gyroscope shows that the electrical noise equivalent rate is lower than O.O1deg/sec, the sensitivity is 93mV/deg/sec, dynamic range is 100deg/sec, the bandwidth is 16Hz, and its measured cross-axis sensitivity is smaller than 0.2%.