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유기중,유장걸 제주대학교 1985 논문집 Vol.20 No.-
Protoplast of carrot were isolated and purified from leaves, roots, and callus of root cambium cultured on MS medium. in order to investigate some basic characteristics of the carrot protoplasts. 1. During enzyme treatment. non-shaking brought about higher yield of protoplasts than shaking by which many protoplasts were destroyed. 2. The sizes of the isolated protoplasts were variable, root protoplasts were largest and leaf protoplasts smallest 3. No color particle was observed in callus protoplasts. but green color in leaf and orange in root. 4. Protoplast densities of leaf and callus were slightly increased after 2-day incubation with the treatment of kinetin and BA. while decreased with the treatmnent of GA. NAA and IAA. Cell wall formation was obserbed from each treatment of growth regulator after 2-day incubation. 5. The protoplast fusions of leaf-root. and leaf-callus were easily recognized in virtue of their typical color and size. The degree of protoplast fusion obtained by PEG eluting method was 1-5%. higher than by the centrifugal method.
MZ 세대 접점 확보를 위한 금융권 메타버스 플랫폼 활용 방향 연구
유기중,박기범,조성원,김동호 한국인터넷방송통신학회 2023 한국인터넷방송통신학회 논문지 Vol.23 No.3
COVID-19는 사회 전 분야 및 경제, 정치에 영향을 미쳤을 뿐만 아니라 산업계에도 막대한 영향을 미쳤다. 감염병 예방 차원에서의 비대면 교류 방식은 필수적이었으며, 이를 경험한 세대는 언제 어디서나 빠르게 접근할 수 있는플랫폼의 중요성을 인식하고 이를 잘 수용할 수 있는 메타버스(Metaverse)에 관심이 쏠리고 있다. 금융업계마다 차별화된 메타버스 플랫폼 전략을 이용하고 새로운 고객 응대 및 수익 창출에 집중하고 있으며, 내외부의 의사소통 창구로도활용되고 있다. 본 논문은 금융권 메타버스의 이론적 배경과 국내외 사례를 분석하고, MZ 세대 접점 확보를 위한 금융권메타버스 플랫폼 활용 방향에 관하여 연구하고 기술해 보고자 한다.
수치표고모델(DEM) 환경에서의 Fast Marching Method(FMM)/폐루프 제어기법 기반 달 탐사로버의 경로계획 및 추종
김건중(Kun-Jung Kim),Giancarlo Eder Guerra Padilla,심병섭(Byeong-Seop Sim),유기호(Kee-Ho Yu) 제어로봇시스템학회 2019 제어·로봇·시스템학회 논문지 Vol.25 No.12
When a lunar exploration rover is running on the surface of the Moon on a scientific mission, the integration of various technologies including the navigation and control strategy considering the slippage and geometric singularity is required to enable the exploration rover to traverse while avoiding hazardous areas and following predefined path. Up to this point, this paper proposed a path planning/following algorithm to efficiently navigate the lunar exploration rover and track the predefined path. We first create a Digital Elevation Model (DEM) as infrastructure in simulation environment map based on the diamond-square midpoint displacement algorithm, and then generates the optimal path on the grid map using fast marching method (FMM). In order to let the exploration rover to track the generated path, the path tracking algorithm considering the slippage and geometric singularities based feedback control is also proposed. Using the wheel-terrain interaction model, the multi-body dynamics simulation induced longitudinal/lateral dynamics on the DEM map was carried out to verify the performance of the proposed algorithm. Finally, numerical analysis is presented to demonstrate the effectiveness of proposed path planning and path following controller.
김건중(Kun-Jung Kim),김성환(Seong-Hwan Kim),유기호(Kee-Ho Yu) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.4
In this paper, the consideration factors that affect the actual driving of a rover wheel was examined based on the wheel-terrain model. For the evaluation of driving performance in a real environment, the test bed of the rover wheel consists of the driving part of the wheel and sensing part of the various parameters was designed and assembled. Using the test bed, the preliminary driving experiment concerning the slip ratio, sinkage, and friction force according to the rotational velocity and the shape of the wheel were carried out and evaluated. The wheel test bed and the experiment results are expected to contribute to finding the optimal result in the designing of the wheel shape and the planning of the driving conditions through further study.