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박상호(Sang-Ho Park),임재동(Jae-Dong Lim),김인수(In-Soo Kim) 한국항해항만학회 2006 한국항해항만학회지 Vol.30 No.3
선박에서 발생되는 밸러스트수를 전처리하기 위하여 수중에 포함되어 있는 입자상 오염물질과 수중생물체를 자동역세척 여과장치를 이용하여 처리한 결과를 나타내었다. 밸러스트수를 처리하기 위한 전처리의 장점은 입자상의 오염물질을 제거하여 후처리공정의 처리효과를 높이는데 있다. 여과필터의 회전속도가 20rpm에서는 여과압력이 40.5mmHg이고, 4아"pm 에서는 36.6mmHg이며 60rpm 이상에서는 35mmHg로 나타나 연속적으로 여과할 수 있었다 필터의 막힘현상으로 역세 회복압력과 역세간격은 시간의 경과에 따라 조금씩 감소하고 처리유량도 감소하는 것을 관찰할 수 있었다. 회분식 여과처리공정은 자동 역세척을 수행하는 공정에 비해서 처리효율의 저하가 일어났다 여과처리를 통하여 7이m이상의 식물성 플랑크톤과 동물성 플랑크톤을 포함하는 수중생물체를 제거할 수 있었다 실험결과를 통하여 밸러스트수 처리에 적용 가능한 기술임을 알 수 있었다. Displayed result that handle particle contaminant and hydrospace organism included a number of ballast that is happened in ship using automatic back washing filter. Reason that removes first contaminant that is included in number of ballast is that heighten processing effect of after processing process of the filter. Another advantage is to drop off the solids with controlling revolution of drum screen in pretreatment filtration process. The fact that it is easy to attach and detach a several type of screen for getting the expected water quality is another advantage. Filter rotation speed of filtration filter could be expose by 35mmHg more than 60 rpm and filter consecutively filtration pressure is 40.5mmHg in 20 rpm and 40 rpm are 36.6mmHg. Filtration system removal aquatic organism over 70umin ballast water. This study shows that the filtration treatment system has a potential for the treatment of ballast water.
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박철민 한국철도학회 2021 한국철도학회논문집 Vol.24 No.4
Electric railroads use a catenary system for the supply of electricity to trains. The catenary system in underground networks consists of a system of rigid conductors. These rigid conductor systems are divided into insulators, supports, and the catenary. Insulators are installed for electrical insulation, and they are cleaned regularly to ensure insulation performance. Human-performed insulator cleaning increases the occurrence of accidents, reduces work efficiency, and increases maintenance costs. Here, we introduce the development process of an automatic cleaning system that automatically follows the stagger of a rigid conductor. The system consists of an automatic positioning system for the stagger of rigid conductors, a high pressure washing device, an integrated control system, and a dedicated vehicle. The effectiveness of the system has been verified via a cleaning test of the insulators in a section of urban railroad tunnel in operation.
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신재호,김희성,장용재,임동균 한국기계기술학회 2021 한국기계기술학회지 Vol.23 No.4
In this research, we have developed the non-contact automatic washer system for two-wheel motor vehicle through structural and fluid analysis. The structural analysis of mainframe was performed for the safety of the bike washer system, and multi-phase fluid analysis was applied for the washer cleaning performance which was analyzed the surface shear stress while varying the nozzle angle. As a result, we have developed the washer system by deriving the spray angle for the shear stress area and by analyzing the housing shape that takes into consideration structural stability. The performance of this washer system was verified by measuring the gloss before and after cleaning in the evaluation of the cleaning performance test of the system.
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ScienceON
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