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조영걸(Younggeol Cho),이준희(Junhee Lee) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.11
전장 환경에서 감시정찰은 임무 성공을 위해 중요하다. 최근 국방 분야에서는 딥러닝 기반의 물체 인식 기술을 도입하고 있으나, 대부분의 물체 인식 모델은 소형 물체 인식에 어려움을 겪기 때문에 먼 거리의 물체를 감시하는 것이 중요한 감시정찰에 치명적이다. 본 논문에서는 물체 인식 모델의 수정 없이 소형 물체를 인식할 수 있도록 모델 입력 크기보다 큰 해상도의 이미지를 분할하여 입력하고 그 결과를 병합하는 기법을 제안하고 소형 물체 인식 정확도가 향상되었음을 확인하였다. Surveillance and reconnaissance are important for mission success in a battle. Recently, deep learning-based object detection has been introduced in the defense field. But most object detectors have difficulties in detecting small objects, which is critical to surveillance and reconnaissance that require monitoring objects over long distances. This paper suggests a technique to split an input image with larger resolution than the input size of a detector into smaller images, input them to the detector, and merge the results to detect small objects without modifying the model. The proposed method increased the accuracy of small object detection.
구동장치 동기화를 위한 네트워크 기반 제어 시스템 오차 분석 및 위치 정확도 향상 기법
조영걸(Younggeol Cho),윤지혁(Jihyeok Yun),장혜민(Hyemin Chang) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.4
Recently, a network-based open architecture has been applied to the fire control system of a ground combat vehicle, in order to reduce whole-life cost and enable efficient operation. Each component of the system to which the open architecture is applied is modularized based on the network, and it operates independently. The network delay and the difference of sampling time between the components that occur as a result may affect the performance of the system, so analysis is required. In this paper, we analyzed the characteristics of the network-based modular motor synchronization system and proposed a sampling technique to improve position accuracy. The proposed technique was verified through experiments in a simulated system environment implemented with DDS(Data Distribution Service) middleware, and it was confirmed that the position accuracy is improved compared to the existing method.
지상 전투 차량을 위한 다채널 영상 스트리밍 시스템의 회전 구동 대비 품질과 압축 대비 지연 분석
윤지혁,조영걸,장혜민,Yun, Jihyeok,Cho, Younggeol,Chang, HyeMin 한국군사과학기술학회 2021 한국군사과학기술학회지 Vol.24 No.1
The multi-channel video streaming system is an essential device for future ground combat vehicles. For the system, the application of digital interfaces is required instead of the direct analog method to support selectable multiple channels. However, due to the characteristics of the digital interfaces that require en/decoding and signal conversion, the system should support the ability to adapt to quality and delay requirements depending on how video data is utilized. To support addressed issue, this study designs and emulates the multi-channel compressed-video streaming system of ground combat vehicle's fire control system based on commercial standards. Using the system, this study analyzes the quality of video according to the rotational speed of the acquisition device and Glass-to-Glass (G2G) delay between video acquisition and display devices according to video compression rates. Through these experiments and analysis, this paper presents the design direction of the system having scalability on the latest technology while providing high-quality video data streaming flexibly.
김봉철(Bongchul Kim),조영걸(Younggeol Cho),이왕열(Wangyeol Lee),이승표(Seungpyo Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Automotive wheel bearing is one of important parts that transmits engine power into wheels and supports vehicle weight. In this study, strength analysis and design optimization are carried out for wheel bearing. First, for cracked bearing strength analysis is performed to calculate the stress distribution. Next, optimization is performed in order to minimize the stress of cracked region. From the result, we assumed that the crack cannot be occurred.
Development of Stiffness Analysis Program for Automotive Wheel Bearing
Inha Lee(이인하),Younggeol Cho(조영걸),Jungho An(안정호),Youngmin Cho(조영민),Munsung Kim(김문성),Cheonsoo Jang(장천수),Younghwan Lee(이영환),Seungpyo Lee(이승표) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Automotive wheel bearing is an essential component of the vehicle and transmits engine power into wheels and supports vehicle weight. As comfortable ride has recently been the common interest, the stiffness of bearing which affects the steering performance becomes significant. In this study, the program BSAP was developed to carry out the stiffness analysis by designer easily and quickly. BSAP has three templates; CATIA template, AFC template, and Report template. In CATIA template, 3D analysis model was generated from the CAD model by eliminating useless fillets and holes and assigning heat treatment parts. Material property, boundary conditions and loadings were applied and analysis was performed in AFC template. Finally, analysis results were reported automatically in Report template. Bearing stiffness analysis was performed by using the BSAP. To verify the reliability of BSAP, the analysis results were compared with experiment results. They showed good agreement with the experiment results.
자동차용 휠 베어링의 Orbital Forming 해석
이승표(Seungpyo Lee),이왕열(Wangyeol Lee),조영걸(Younggeol Cho) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, the orbital forming analysis of automotive wheel bearing was performed by finite element method. Commercial software MSC.MARC was used and 2-dimensional axisymmetric element was applied. Deformation, stress, and force direction were calculated and investigated for the design aspect. To verify the reliability of this study, experiment was carried out and compared with analysis results. The experiment results showed good agreement with the analysis results.