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Prioritizing Maintenance of Naval Command and Control System Using Feature Selection
Junhyeong Choi(최준형),Dongsu Kang(강동수) 한국컴퓨터정보학회 2019 韓國컴퓨터情報學會論文誌 Vol.24 No.11
해군 지휘통제체계는 작전에 매우 중요한 체계이고, 이 체계의 장애는 전쟁 수행에 있어 치명적일 수 있다. 이러한 장애에 대비하기 위하여, 데이터 마이닝 기법 중 하나인 속성 선택(Feature Selection) 기법을 이용한다. 먼저, 해군의 2016년부터 2018년까지의 장애 데이터를 분석한 후, 속성 선택 기법을 이용하여 장애와 가장 연관이 깊은 속성을 도출하고 장애에 대하여 예측한다. 또한, 속성 간의 연관 정도를 이용하여 해군 지휘통제체계의 유지보수 우선순위를 산정하는 방법을 제안한다. 이는 해군 지휘통제체계 유지보수에 있어 효율성과 경제성을 향상시킬 수 있다. Naval command and control system are very important for operation and their failures can be fatal for warfare. To prepare for these failures, we use feature selection method which is one of the data mining techniques. First, we analyzes failure data set of Navy from 2016 to 2018. And then We derive attributes that are associated with failure and to predict failure using feature selection method. We propose a method for prioritizing maintenance using the degree of association of attributes. This improves the efficiency and economics of command and control system maintenance.
최준형 ( Junhyeong Choi ),강동수 ( Dongsu Kang ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.1
북한에서 운영하고 있는 오피스 프로그램인 서광사무처리 3.0은 ODF(Open Document Format) 파일 포맷을 입력으로 받아 문서를 처리한다. ODF는 여러 개의 XML(Extensible Markup Language) 파일로 구성되어 있고, 하위 노드들을 통해서 파일 구조를 정의한다. 이러한 서광사무처리 3.0의 ODF 파일 구조를 하위 프로그램별 입력받는 파일 확장자에 따라 공통 영역과 가변 영역으로 비교하고, CVE(Common Vulnerabilities and Exposures)를 통해 ODF와 XML 주요 취약점을 분석한다.
배한결(Hankyul Bae),우준규(Jungyu Woo),유승건(Seunggun Yu),최준형(Junhyeong Choi),현영서(Youngseo Hyeon) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
Recent progress in the vehicle industry has been about making suspension systems lighter and more durable. These systems are key for keeping cars stable and comfortable to drive. However, parts of the suspension, like the lower arm, can often have issues with too much stress. This paper talks about how to deal with these stress problems in the lower arm, aiming to make it last longer. By looking at how much stress happens when changing lanes or braking, we try to figure out how it affects the suspension. Using Taguchi method, we look for the best shape for the lower arm that lowers stress and makes it last longer. Our results show that the best shape for the lower arm can greatly reduce stress and increase its life, while also cutting its weight by about 60%. This study helps a lot in making cars lighter and more durable by finding the best shape for the lower arm.
김민석(Minseok Kim),정우석(Wooseok Jeong),신대수(Daesu Shin),강상원(Sangwon Kang),윤병찬(Byeongchan Yun),이상희(Sanghee Lee),최준형(Junhyeong Choi),염호현(Hohyun Yeom),하은결(Eungyeol Ha),현영서(Youngseo Hyeon) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
To enhance the performance and energy efficiency of electric vehicles, it is imperative to reduce aerodynamic drag. In this study, we devised exterior design improvements aimed at reducing the aerodynamic drag of an electric vehicle created for participation in a student engineering competition. Computational fluid dynamics analysis using SIMLAB was conducted to evaluate the impact of the exterior design on drag reduction compared to the baseline model.
가이드 베인 개수에 따른 자작 전기자동차 에어 덕트 내부 유동 최적화
김민석(Minseok Kim),신대수(Daesu Shin),정우석(Wooseok Jeong),윤병찬(Byeongchan Yun),강상원(Sangwon Kang),염호현(Hohyun Yeom),현영서(Youngseo Hyeon),하은결(Eungyeol Ha),이상희(Sanghee Lee),최준형(Junhyeong Choi) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
The internal flow of the self-made electric vehicle air duct was optimized according to the number of guide vanes. Existing self-made cars had excessive motor heating problems while driving, and to solve this problem, air-cooled air ducts for self-made cars were designed. The design goal was to maximize the cooling effect by allowing as much flow rate to flow inside the air duct as possible, and the initial model was designed by combining design variables that affect the flow rate in the air duct within space constraints. Internal flow analysis was conducted using Altairs Simlab, and additional guide vanes were devised to remove eddy currents in the duct and control uniform flow. The results of internal flow analysis according to the number of guide vanes were analyzed, and the average flow value at the outlet surface of the air duct was extracted using Simlabs Acuprobe function, and the optimal number of guide vanes was eventually selected. Finally, the cooling effect of the optimal model of the air duct was verified through actual measurement, and ASA Plastic was manufactured in kind using a 3D printing technique.