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이광록,오광석 한국자동차공학회 2024 한국 자동차공학회논문집 Vol.32 No.4
This paper presents a feedback gain adaptive path tracking algorithm on autonomous mobility that is based on disturbance reconstruction with a sliding mode observer(SMO). In the design of the path tracking controller vehicle error dynamics, the desired yaw rate is generally required. The simple kinematics-based error dynamics was used, while the disturbance, including the desired yaw rate, was reconstructed by an SMO under a finite-time stability condition in real-time. The feedback gains in determining the steering control input adaptively are computed by using the desired eigenvalue and vehicle longitudinal velocity. Finally, to obtain a reasonable performance evaluation, waypoint-based curved path scenarios were examined under two velocity conditions in Matlab/Simulink and CarMaker software environment.
보강된 복합적층 패널의 좌굴 및 좌굴후 거동의 형상 최적설계에 관한 연구
이광록,정기현,허성필,양원호,조명래,Lee, Gwang-Rok,Jeong, Gi-Hyeon,Heo, Seong-Pil,Yang, Won-Ho,Jo, Myeong-Rae 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.1
In this study, a shape optimization of stiffener was conducted to increase buckling load or failure load in each case with a different design value and a different objective function for stiffened laminated composite panel of I-type under compression loading. Regarding each of buckling load or failure load as objective function, optimum design was carried out. In respect of optimum design, the effects of relative length of web and cab of stiffener on buckling load or failure load of postbuckling were investigated.
보강된 복합적층 패널의 좌굴해석 및 최적설계에 관한 연구
이광록,허성필,양원호,정기현 기계기술연구소 2000 성균관대학교 논문집 기계기술편 Vol.2 No.1
In this study, a shape optimization of stiffener was conducted to increase buckling load or failure load in each case with a different design value and a different objective function for stiffened laminated composite panel of I-type under compression loading. Regarding each of buckling load or failure load as objective function, optimum design was carried out. In respect of optimum design, the effects of relative length of web and cab of stiffener on buckling load or failure load of postbuckling were investigated.
Differential responses of peroxidases in sweetpotato suspensioncultured cells to cadmium treatment
김주환,남기정,이광록,김윤희 한국식물생명공학회 2023 JOURNAL OF PLANT BIOTECHNOLOGY Vol.50 No.2
As cultured plant cells can grow in high oxidative stress conditions, they form an excellent system to study antioxidant mechanisms and the mass production of antioxidants. Oxidative stress is a major cause of damage in plants exposed to various types of environmental stress, including heavy metals, such as cadmium (Cd). Heavy metal accumulation can interfere with many cell functions and plant growth. To evaluate the contribution of oxidative stress to Cd-induced toxicity, cultured sweetpotato (Ipomoea batatas) cells were treated with increasing concentrations of Cd (0, 10, 25, and 50 μM) and cultured further. Cell growth was significantly inhibited by 25 and 50 μM of Cd, and the total protein content increased with 50 μM of Cd. Additionally, the activity of peroxidase (POD) and ascorbate peroxidase (APX), antioxidant enzymes that remove hydrogen peroxide (a reactive oxygen species), increased in the cells after treatment with 50 μM of Cd. The expression analysis of POD, APX, and peroxiredoxin (PRX) isolated from sweetpotato cultured cells in a previous study revealed the differential expression of POD in response to Cd. In this study, the expression levels of several acidic POD (swpa2, swpa3, and swpa4) and basal POD (swpb1, swpb2, and swpb3) genes were increased in Cd-treated cultured cells. These results indicate that Cd-mediated oxidative stress is closely linked to improved POD-mediated antioxidant defense capacity in sweetpotato suspension-cultured cells.