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수중 유속 및 유향의 동시 측정을 위한 이미지 분석 기술에 관한 연구
서동민,변성훈,오상우 한국센서학회 2023 센서학회지 Vol.32 No.5
To measure the flow velocity and direction in the near field of an unmanned underwater vehicle, an optical measurement unit containingan image sensor and a phosphor-integrated pillar that mimics the neuromasts of a fish was constructed. To analyze pillar movement,which changes with fluid flow, fluorescence image analysis was conducted. To analyze the flow velocity, mean force analysis,which could determine the relationship between the light intensity of a fluorescence image and an external force, and length-force analysis,which could determine the distance between the center points of two fluorescence images, were employed. Additionally, angle analysisthat can determine the angles at which pixels of a digital image change was selected to analyze the direction of fluid flow. The flowvelocity analysis results showed a high correlation of 0.977 between the external force and the light intensity of the fluorescence image,and in the case of direction analysis, omnidirectional movement could be analyzed. Through this study, we confirmed the effectivenessof optical flow sensors equipped with phosphor-integrated pillars.
서동민,김용수,김현수 한국산업경영시스템학회 2011 한국산업경영시스템학회 학술대회 Vol.2011 No.-
To prevent global warming, a variety of governments are investing in electric vehicle research and especially in Korea, electric vehicle is trying to be applicable to public transportation. Lithium batteries used in electric vehicles such as mobile phone and laptops are mainly used and life cycle is expected to 1-2 year. If electric vehicles are used popularly, many discarded batteries will occur and it is harmful to the environment. In addition, lithium batteries are explosive in nature and should be treated cautiously. Therefore, reverse logistics is needed to handle the batteries efficiently and safely. Reverse logistics includes the collection, remanufacturing, recycling and discarding of the waste. In this study, reverse logistics process for electric vehicle batteries is developed through the analysis of the AS-IS process of the lead and lithium batteries. In addition, disposal regulations for electric vehicle batteries are proposed based on the current law of the waste of the conventional batteries.