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열처리로 직화버너에서 연료-공기 혼합에 따른 화염 영향
이철우(Cheolwoo Lee),김영호(Youngho Kim),김인수(Insu Kim),홍정구(Junggoo Hong) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
Experiments have been performed for the burners used in the non-oxidizing direct fired furnaces for the cold rolled plate to investigate the effect of fuel/air mixing patterns of the burner nozzle on flame shape, temperature and combustion gas concentration. CFD simulation has also been performed to investigate the mixing state of air-fuel for a nozzle mixing burner and a partially pre-mixing burner. A partially pre-mixing burner showed that flame temperature increased up to 26℃ on average compared than that of the nozzle mixing. It also showed that the mixing distance is important at the partially pre-mixing burner. Test results for a partially pre-mixing burner showed that the residual oxygen concentration and the volume ratio of CO/CO2 of the flame were applicable to be used in field furnaces.
Pseudo-LiDAR를 활용한 자율주행 영상인식 시스템의 3D 객체 검출 성능향상 연구
이철우(Cheolwoo Lee),백초혜(Chohye Baek),나희연(Heeyeon Nah) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
With the rise of artificial intelligence (AI) and the success of various deep neural network (DNN) applications, the autonomous driving has gained significant interest as one of promising research fields in both industry and academia. Autonomous driving technologies are largely divided into three stages which are perception, decision and control, and AI is making great research achievements in the perception. So far, the LiDAR sensor has been considered as a primary sensing media since it provides accurate depth information. Nevertheless, researchers have sought the alternative of the LiDAR due to the high cost and power consumption, as well as its unattractive design. In this work, we present an alternative, cost-effective and highly accurate 3D object detection mechanism built upon a simple stereo camera sensor, while providing performance comparable to the one based on LiDAR sensor. By converting images into point cloud called Pseudo-LiDAR and using it, then we can achieve 3.6x greater accuracy than image based algorithms. In terms of speed, we can achieve 18x faster inference time than MV3D or F-PointNet. In conclusion, an accurate and cost-effective object detector can be made by combining Complex-YOLO and the Pseudo-LiDAR method.
이철우 ( Cheolwoo Lee ),구기홍 ( Kihong Ku ),김대용 ( Daeyong Kim ),손명조 ( Joonyun Lee ),이중윤 ( Myeongjo Son ) 한국국방기술학회 2020 한국국방기술학회 논문지 Vol.2 No.4
종래 리스크 예측/식별 기법들이 과거 경험한 유사 사례가 없는 미지의 미래 체계에 리스크 요소를 예측/식별하는데는 많은 제한이 된다. 특히 실전 경험이 없는 미지의 미래 무인무기체계는 운용개념에 대해 예측하기가 매우 어려운데다가 유인에 의한 임기응변조차 제한되어 무인무기체계의 실전 배치시 그 임무 달성에 실패하거나 예기치 못한 사건/사고를 발생시킨 사례가 적지 않다. 이를 극복하기 위해 예측적 고장결정 기법을 모델기반 시스템 공학(MBSE)과 결합하여 최근 군에서 미래 무인 무기체계 개발사업의 일환으로 추진 중인 국방 무인OO차량개발사업의 리스크 해소방안에 적용한 사례를 소개하여 미래 무인무기체계 개발사업의 리스크 해소와 성공 가능성을 높이는데 기여하고자 하였다. Conventional risk prediction/identification techniques have many limitations in predicting/identifying risk factors in an unknown future system without similar cases experienced in the past. In particular, an unknown future unmanned weapon system with no practical experience is very difficult to predict about its operational concept, and even ad hoc response by manned is limited. There are not a few cases. In order to overcome this, we introduced a case where the predictive failure determination technique was combined with model-based system engineering (MBSE) and applied to the risk reduction plan of the defense unmanned OO vehicle development project, which is currently being promoted by the military as part of the future unmanned weapon system development project It aimed to contribute to solving the risk and increasing the possibility of success in the future unmanned weapon system development project.
연료 및 공기의 혼합구조가 로타리 킬른 용 버너 화염에 미치는 영향
김영호(Youngho Kim),이철우(Cheolwoo Lee),김인수(Insu Kim),임영빈(Youngbin Lim) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
Rotary kiln produces lime from limestone through thermal decomposition. Ring formation in kiln internal wall is known issue that decreases productivity. The cause of ring formation is temperature imbalance as flame leans toward upper wall. Therefore, burner nozzle geometry was changed to improve air-fuel mixing state which leads to prevention of ring formation. CFD simulation and experimental test were performed in this study to investigate the effect of air-fuel mixing on flame structure, temperature and NOX concentration. It is shown that combustion efficiency has been enhanced and NOX concentration has been decreased by using swirl flow for secondary combustion air. It"s also shown that flame has been straightened by using straight flow for secondary combustion air.