• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1999년도 제30회 추계학술대회
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• pp.184-189
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• 1999

This Paper presents the friction and lubrication charateristic related with oil aeration. It is well known that oil aeration occurs severe problem on lubrication system, in particular, in the engine bearings and hydraulic lash adjuster. In this study, engine tests were carried out in motoring conditions. In order to investigate oil aeration characteristics, we measured oil aeration with respect to oil temperature, oil viscosity, modified oil drain system. From the results, we concluded that aeration can be reduced by improving oil drain system and FMEP can be reduced by minimising of aeration.

• 한국자동차공학회논문집
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• 제19권5호
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• pp.51-57
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• 2011

Parametric studies based on analysis of lubrication system of a four cylinder gasoline engine are illustrated system in this paper. In development process of engine lubrication system, parts of failure cases are related with oil pull over and oil churning phenomenon. The crankcase & head system pressure by oil churning phenomenon are gradual increased. It cause oil pull over phenomenon at engine breather line and oil over-consumption. In order to improve oil reduction and oil pull over phenomenon are also considered in the developing state. For this study, the characteristics of engine lubrication system are measured at various tilting angle and drain hole sizes. In addition, the oil flow & oil quantity are tested by blow by meter and catch jar. Results are presented to stabilize the oil supply system at sever driving condition. The data from present study are available for the engine lubrication system.

• 기술사
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• 제45권6호
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• pp.28-32
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• 2012

Namhae chemical is one of the largest fertilizer manufacturing company in Korea which company has operating 4 unit agitator gear boxes and producing variety kinds of fertilizer production. The gearbox operating temperature of agitator is approximated in $55^{\circ}C{\sim}90^{\circ}C$ and required to keep operating continuous without stopping. The system required high performance oil and longer oil drain interval as limited workforce in maintenance team. It was lubricated by mineral gear oil of ISO VG 320 and also need to change to new oil frequently. Namhae Chemical would expect to keep stable operating condition without shut down and consider, lower cost of operation and equipment protection.

• 해양환경안전학회지
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• 제8권2호
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• pp.79-86
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• 2002

A heating cargo is solidified by several reasons during carriage. This study is to analyse a cargo accident which 811,202 US barrels of Nile Blend crude oil reamined solid In the tanks after discharge. There are some possibilities that low temperature of Beading cargo below cloud point and wax appearance temperature at loading time, heating interruption during voyage or discharging, and prohibition of crude oil washing during discharging might influence the cargo solidified. But we concluded that the defect of heating system would most affect the heating cargo solidified locally, and which blocked drain hole of bottom transverse and web frame and they obstruct flow of heating cargo in the tanks.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2002년도 추계학술발표회
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• pp.59-70
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• 2002

A heating cargo is solidified by several reasons during carnage. This study is to analyse a cargo accident which 811, 202 US barrels of Nile Blend crude oil reamined solid in the tanks after discharge. There are some possibilities that low temperature of loading cargo below cloud point and wax appearance temperature at loading time, heating interruption during voyage or discharging, and prohibition of crude oil washing during discharging might influence the cargo solidified. But we concluded that the defect of heating system would most affect the heating cargo solidified locally, and which blocked drain hole of bottom transverse and web frame and they obstruct flow of heating cargo in the tanks.

• International Journal of Naval Architecture and Ocean Engineering
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• 제11권1호
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• pp.52-58
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• 2019

Marine emissions of Volatile Organic Compounds (VOCs) have received much attention because the International Maritime Organization (IMO) requires the installation of vapour emission control systems for the loading of crude oils or petroleum products onto ships. It was recently recognised that significant corrosion occurs inside these vapour emission control systems, which can cause severe clogging issues. In this study, we analysed the chemical composition of drain water sampled from currently operating systems to investigate the primary causes of corrosion in vapour recovery systems. Immersion and electrochemical tests were conducted under simulated conditions with various real drain water samples, and the impact of corrosion on the marine vapour recovery system was carefully investigated. Moreover, corrosion tests on alternative materials were conducted to begin identifying appropriate substitutes. Thermodynamic calculations showed the effects of environmental factors on the production of condensed sulphuric acid from VOC gas. A model of sulphuric acid formation and accumulation by the characteristics of VOC from crude oil and flue gas is suggested.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.346-348
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• 2007

Underground pipe is an instrument to transport rapidly and safely a lot of fluid like gas, oil, water supply and drain system. It acts like blood vessels of human body in a modern industry. As in this country, the pipe facilities have been constructing since 1970's. The pipes constructed for a long time ago are already starting to reveal the problem like corrosion and most of them are built underground. So for companies, the managing of the underground pipes is very hard because it needs high technology and a lot of money. So we made a new robot system to repair and maintain the pipes at a low price. This new robot is devised using pressing wall type to work inside 700${\sim}$900(mm) size pipe. And it has good carrying and working power.

• 대한영양사협회학술지
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• 제18권3호
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• pp.248-265
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• 2012

A total of 262 dietitians (in 97 college foodservices nationwide, 86 elementary school foodservices, and 79 middle & high school foodservices in the Changwon area) were given a survey questionnaire composed of 18 GMP and 29 SSOP items from May to July, 2011. As a whole, total usage level of GMP facilities (3.65/5 points) and total management level of SSOP (3.86) in college foodservices showed no significant differences compared to those in elementary school foodservices (GMP 3.74, SSOP 4.02) and middle & high school foodservices (GMP 3.75, SSOP 3.95). However, the results of this study suggest that seven items of the GMP facilities and five items of the SSOP should be improved for the development of the HACCP facility model in college foodservices. Those items that showed considerably lower points in GMP were as follows: 'Drain pipes from sinks of the cooking area are connected directly to the drain (3.74)' (P<0.001), 'The grease trap is installed outside the cooking area equipped with an oil separator (3.24)' (P<0.01), 'Entrance and the cooking area are adequately equipped with hand-washing and shoe disinfecting facilities (3.61)' (P<0.001), 'Cooking area, food storage, and dining area are adequately equipped with insect and rodent repellents (3.72)' (P<0.001), 'Cooking areas are equipped with air-conditioning/heating system and ventilation facility for maintenance of temperature and humidity (3.35)' (P<0.05), and 'Toilets for cooking staff only are provided; the its doorways are not directly accessible from the cooking area (3.25)' (P<0.01).

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.46-48
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• 2008

A concern about micro grid connection system is elevated. The reason is that carbon dioxide emission is regionally restricted to prevent the drain of fossil fuel, high oil prices and global warming. The existing photovoltaic DC-DC converter is operated by the full-bridge method. However, the configuration is complicated because a phase shift method is required to raise an efficiency. A photovoltaic DC-DC converter connected with second layered half-bridge converter and boost converter is proposed in this paper. This proposed DC-DC converter is easy to control and has an advantage of reducing the size. Finally, the validity of the proposed converter is verified by the experimentation.

• 한국자동차공학회논문집
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• 제17권2호
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• pp.132-140
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• 2009

Recently, the interest in the development of high efficiency Diesel engine technology using alternative fuel has been on the rise and related studies are being performed. Therefore, the DME(Dimethyl Ether), an oxygen containing fuel as an alternative fuel for light oil that can be used for diesel engines since it generates very little smoke. But it is unavoidable that the modification of a fuel supply system in an engine to application of the DME fuel because of DME fuel properties. So, in this study, a DME high pressure pump for a common-rail fuel supply system has been composed and the test results of the pump have been presented. As the results of the tests, it is confirmed that DME pump inlet pressure, pump speed and common-rail pressure effects on the volumetric efficiencies of the pump. Finally, it is defined that the optimum plunger volume of a DME pump has to be extended to the minimum 150% compared to a Diesel pump plunger volume considering DME fuel properties and volumetric efficiencies characteristics at same specifications of the high pressure pump.