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자율주행 안정성 향상을 위한 인식 필터 설계 및 속도 제어 방법
장현수(Hyeonsoo Jang),송재민(Jaemin Song),김현수(Hyeonsoo Kim),서석현(Sukhyun, Seo) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
An important factor in developing self-driving cars is to ensure stability in driving. To do this, it is necessary to design a filter with good performance or implement an autonomous driving system by applying a function that is strong against external noise. In this paper, methods for improving the stability of autonomous driving are presented. When detecting lanes, a median filter is applied and a function to recognize only linear changes has been added. In addition, the vehicle does not deviate from the lane through speed control during steering. Using the position of the obstacle measured using the Lidar and the detected lane, it avoids the obstacle without leaving the lane. Crosswalk recognition must satisfy two conditions: pattern recognition and color detection. By using AR markers for parking, functions can be performed regardless of light, terrain, or obstacles.
벼 재배지 논물의 수질특성과 Chl-a 변동 요인의 통계적 분석
배희수 ( Hui Su Bae ),장현수 ( Hyeonsoo Jang ),황재복 ( Jaebok Hwang ),안승현 ( Seung Hyeon Ahn ),윤종탁 ( Jong Tak Youn ),김욱한 ( Uk Han Kim ),배범수 ( Beomsoo Bae ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.11
Statistical analysis was carried out to identify the influence on environmental factors between paddy water chemical properties and Chl-a concentration (algae biomass index) using water samples collected in June for 3 years at rice paddy field. As a result of correlation analysis, there was a significantly negative relationships in DO(-0.366) and pH(-0.141). In contrast, significantly positive relationships were founded in COD(+0.431) and TOC(+0.422). According to the result of factor analysis, 3 factors were obtained and indicated that PC1 were Ca, K, Mg cation, PC2 were TOC, T-P, PO<sub>4</sub><sup>3-</sup>-P and DO, and PC3 were T-N and NH<sub>4</sub><sup>+</sup>-N. As a result of linear regression analysis to develop a prediction model for chl-a concentration, the total amount of explanation was 20.6%, PC2 had the greatest influence on the increase of chl-a concentration and PC1 also showed a positive correlation but the PC3 has a negative correlation. In conclusion, carbon and phosporous content are the main factors for the increase algae blooms of rice paddy.
Fluent를 이용한 3톤급 액체로켓엔진 매니폴드 내 추진제 유동 균일성 해석
윤동호(Dongho Yun),조현택(Hyeontaek Jo),장현수(Hyeonsoo Jang),현성윤(Seongyoon Hyun),정진택(Jintaeg Jung),홍용기(Yonggi Hong),윤영빈(Yuongbin Yoon) 한국추진공학회 2023 한국추진공학회 학술대회논문집 Vol.2023 No.5
3톤급 액체로켓엔진 추진제 매니폴드에서 유동 균일성을 파악하기 위하여 Fluent를 이용해 유동해석을 수행하였다. 매니폴드 초도 설계안을 기반으로 유동 균일성 향상을 위해 연료 분배판과 추진제 배관 유입구의 형상을 변경하였고, 이러한 초도 설계안과 수정 설계안들에 대한 전산해석 결과의 유동 균일성을 비교/분석하였다. 전산해석 결과, 초도 설계안과 비교하였을 때 수정 설계안의 유동 균일성이 개선되었음을 확인하였다. Flow analysis was performed using Fluent to determine flow uniformity of 3 tonf liquid rocket engine propellant manifold. Based on the manifold initial design, the shape of the fuel distribution plate and propellant pipe inlet was changed to improve flow uniformity, and the flow uniformity of the computational analysis results for these initial and modified designs was compared/analyzed. As a result of the computational analysis, it was confirmed that the flow uniformity of the revised design was improved compared to the initial design.