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강우빈,박수홍,이원기 한국ITS학회 2021 한국ITS학회논문지 Vol.20 No.1
고정밀 지도의 갱신은 정사영상 또는 점군 데이터 등을 원천 자료로 하여 기하 정보를 우선적 으로 수정한 이후 지도를 구성하는 공간객체들 간의 연관관계를 재정립하는 방식으로 진행된다. 이러한 일련의 과정들은 기하 정보를 처리하는 데에 많은 시간을 소요하므로 차량의 실시간 경 로 계획(Real-time route planning)에 빠르게 적용되기 어렵다. 따라서 이 연구에서는 그래프 구조 를 활용하여 경로 계획을 위한 도로 연결구조를 우선적으로 업데이트 하는 방식 및 도로 네트워 크의 특징을 고려한 그래프 구조의 저장 유형을 제안하였다. 또한 제안된 방법을 실제 도로 자료 에 적용해 봄으로써 실시간 경로 정보 전송 시의 활용 가능성에 대해 검토하였다. The update of a high-precision map was carried out by modifying the geometric information using ortho-images or point-cloud data as the source data and then reconstructing the relationship between the spatial objects. These series of processes take considerable time to process the geometric information, making it difficult to apply real-time route planning to a vehicle quickly. Therefore, this study proposed a method to update the road network for route planning using a graph data structure and storage type of graph data structure considering the characteristics of the road network. The proposed method was also reviewed to assess the feasibility of real-time route information transmission by applying it to actual road data.
강우빈,신윤찬,조홍현 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
The efficiency of an evacuated tube solar collector was experimentally measured and analyzed according to the size of CuO nanoparticle and the concentration of the CuO nanofluid. In addition, the efficiency of the evacuated tube solar collector using CuO nanofluid as a working fluid was compared with that when water was used. As a result, the efficiency of the evacuated tube solar collector improved as the concentration of the CuO nanofluid increased at low concentration. Further, the efficiency of the evacuated tube solar collector was higher at a mass flux rate of 598 kg/s·m 2 than at 420 kg/s·m 2 . The highest efficiency of the solar collector with 40 nm-CuO nanofluid was 69.1 %, an improvement of 2.0 % compared to 80 nm-CuO nanofluid. The most optimal concentration of the 40 nm-CuO nanofluid was 0.5 vol% and an improvement of thermal efficiency was 7.2 % compared to water. In addition, at this concentration, the efficiency improved by 4.4 %, 2.3 % and 0.3 % compared to that at concentrations of 0.1 vol%, 0.3 vol% and 0.7 vol%, respectively. The use of CuO nanofluid in the evacuated tube solar collector can improve the efficiency and can maintain the high efficiency for wide operating conditions compared to water.
R134a와 R1234yf 냉매 적용에 따른 냉동탑차 냉장시스템 성능비교
강우빈(Woobin Kang),신윤찬(yunchan Shin),조홍현(Honghyun Cho) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
Recently, the importance of delivery is being magnified according to grow online and mobile shopping market. Especially, transport of frozen food by online and home shopping is increasing, therefore, the demand of refrigeration truck is increasing. This study was to compare the performance characteristics of refrigeration system using R134a and R1234yf in a refrigeration truck. When the refrigerant charging amounts increased from 1.1 to 1.4 kg, COP of R134a system was increased and the maximum COP was 2.63 at the charge of 1.4 kg. And that of R1234yf system was 2.493 at the charge of 1.3 kg. The optimal EEV opening of COP of R134a and R1234yf system was 60% and 50%, respectively. Besides, the COP was 2.751 and 2.493 for 134a and R1234yf at the optimal EEV opening. When the compressor rotating speed increased from 1000 to 2000 rpm, the system COP of R134a and R1234yf decreased by 38.8% and 35.9%, respectively.
CuO 나노유체를 적용한 평판형 태양열 집열기와 U-tube형 태양열 집열기의 성능 비교분석
강우빈(Woo Bin Kang),조홍현(Hong Hyun Cho) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
본 연구에서는 CuO 나노유체가 평판형 집열기와 U-tube 집열기의 효율에 미치는 영향을 조사하기 위하여 CuO 나노입자의 크기와 CuO 나노유체의 농도 변화에 따른 효율을 분석하였다. CuO 나노유체의 농도가 0.5 vol%이고 질량유량이 0.047 kg/s일 때 평판형 집열기와 U-tube 집열기에서 CuO 나노입자의 크기가 상대적으로 작은 40 nm에서 높은 효율을 보이는 것으로 나타났으며 이 때 최대 효율은 73.5%이고, 이는 나노입자의 크기가 80 nm인 나노유체보다 효율이 약 5% 향상된 것으로 확인되였다. U-tube 집열기는 나노입자의 크기가 40 nm일 때 최대 효율은 69.5%이고, 이는 나노압자의 크기가 80 nm인 나노유체보다 약 2.8% 향상된 효율을 보였다. 평판형 집열기의 경우 0.5vol%일 때 73.5%로 가장 높은 효율을 보였으며 이는 물을 사용하였을 때보다 약 16.9% 향상된 값이다. 또한 U-tube 집열기의 경우 0.5vol%일 때 69.5%로 가장 높은 효율을 보였으며 물을 사용하였을 때보다 약 12.6% 향상되었다. 두 집열기 모두 0.7vol%-CuO 나노유체를 사용하였을 때와 0.5vol%-CuO 나노유체를 사용하였을 때 효율이 비슷하게 나왔다.
물과 Al₂O₃ 나노유체 적용 평판형, U-tube, 히트파이프 태양열 집열기의 성능 비교
강우빈(Woobin Kang),신윤찬(Yunchan Shin),이민정(Minjung Lee),조홍현(Honghyun Cho) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In this study, the performance of three kinds of solar collectors was analyzed according to operating conditions through theoretical method. The flat plate, U-tube, and heat pipe solar collector was used to compare the performance with operating condition. As a result, the maximum efficiency of flat plate, U-tube, and Heat pipe solar collector was 61.3%, 59.7%, and 69.2%, respectively, when the water was used as the working fluid in the solar collector. The highest efficiency of heat pipe was 7.9% and 10.8% higher than that of flat plate and the U-tube solar collector. When the Al₂O₃ nanofluid was applied in the solar collector, the maximum efficiency of flat-plate, U-tube, heat pipe solar collector was increased by 17.9%, 16.9% and 11.3%, respectively, compared to that when the water was used.