• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.359-368
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• 1996

The performance and exhaust emissions of a diesel engine using light oil, heated, rice-bran oil , heated rice-bran oil treated with ultrasonic wave, used frying oil, use frying oil treated with ultrasonic wave, used frying oil, used frying oil treated with ultrasonic wave, methyl esters of rice-bran oil and used frying oil have been compared. All the fuels performed satisfactorily in a precombustion chamber-type diesel engine without injection pump recalibration or any engine modification at the range of engine speed from 1600 to 2800 rpm at its full load during a sort period , with the rice-bran oil and rice-bran oil treated with ultrasonic wave requiring somewhat preheating when ambient temperature was below 15$^{\circ}C$. General performance and emission characteristics of light oil and bio-oils were comparable , with the bio-oil based fuels giving very low SO$_2$ and lower smoke readings.

• 미래기술융합논문지
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• 제3권2호
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• pp.39-44
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• 2024

본 연구는 현대인의 스트레스로 인한 우울증, 불안, 불면증을 개선할 목적으로 천연 아로마 솔루션을 개발하고, 그 솔루션을 이용하여 물티슈에 응용하였다. 구체적으로, 소나무오일 솔루션는 한국산 소나무 오일과 블랙체리 오일를 혼합하여 제조하였다. 제조한 소나무 오일 솔루션에 대하여, 중금속 분석, 항균 분석, 심리 평가 및 피부 평가를 수행하고 스트레스 개선용 기능성 아로마 물티슈 제조 가능성을 검토하였다. 더나아가, 소나무오일 솔루션 물티슈의 피부 개선 여부를 조사한 결과, 보습 및 탄력 측면에서 개선의 효과가 있는 것으로 나타났다.

• Journal of Advanced Marine Engineering and Technology
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• 제36권7호
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• pp.885-893
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• 2012

DME (Dimethyl ether) is regarded as one of the candidates of alternative fuels for diesel engine, because of its higher cetane number suitable for a compression ignition engine. Also, DME is a simple chemical structure, colorless gas that is easily liquefied and transported. On the other hand, Bunker oil (JIS C heavy oil) has long been used as a basic fuel in marine diesel engines and is the lowest grade fuel oil. In this study, the combustion and emission characteristics were measured experimentally in the direct injection type diesel engine operated with DME and Bunker oil mixed fuel. From our experimental results, it is induced that DME and Bunker oil blended fuel would be an effective fuel which can reduces the concentration of harmful matter in exhaust gases.

• 한국해양학회지
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• 제21권2호
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• pp.118-123
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• 1986

流出油는 GC分析에 의한 油指紋法(Oil Fingerprinting Method)으로 流出原因油와 比較分析하여 識別한다. 一般的으로는 GC에 의하여 飽和炭化水素, 黃化合物을 分離分析한다. 그러나, 기름의 成分은 複雜하고 流出된 상태에 따라 成分組成이 변하므로 어느 한 成分의 分析에 의한 識別보다는 여러성분에 대한 多角的인 分析에 의한 識別方法이 要求된다. 本 硏究에서는 原油, 重油中에 含有되 어 있는 多環芳香族 炭化水素를 分離分析하였다. 이들은 比較的 安定하기 때문에 時 化의 영향을 적게 받는다. GC에 의한 多環芳香族 炭化水素 分析은 産油地 判別 및 油種을 識別할 수 있는 油脂紋法의 한 方法이다.

• 한국안전학회지
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• 제24권6호
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• pp.150-156
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• 2009

The oil pressure switch(OPS) for automobile is very important part to prevent an overheated engine and other problems by checking the operation of an engine oil system and displaying oil signs on a dashboard. OPS is the part that receives various stress caused by temperature, vibration, and corrosion in an engine room. Regarding existing steel OPS cases, there occur field errors due to the rust, and much concern comes from the low anticorrosion caused by CR6+ Free according to the restrictions of heavy metals. Therefore, the study analyzed average life, the failure rate, and reliability through the tests of performance according to temperature changes, mechanical strength, and run-test in order to confirm if the use of the oil pressure switch with Al of anti-corrosion can improves the reliability, instead of the existing steel products.

• 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.

• 한국기계기술학회지
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• 제13권4호
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• pp.85-91
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• 2011

Experimental analysis has been carried out to investigate thermal characteristics of hydraulic system in special vehicles. Hydraulic system performance is largely influenced by oil temperature, and there are considerable performance decline and malfunctions in the system for high temperature conditions caused by heavy load and continuous operation. Transient oil temperature and pressure variation are analyzed and heat generation rates in the several main system parts are compared for various flow rates. With the start of system operation oil temperature gradually increases, and viscosity deceases by about 70% as temperature increases from $20^{\circ}C$ to $80^{\circ}C$. Operation pressure in the hydraulic system decreases with oil temperature, and its variation rate becomes less steep as oil temperature increases. Heat generation rate in hydraulic pump also depends on the oil temperature, and it reaches maximum near $50^{\circ}C$. These results in this study can be applied to optimal design of efficient hydraulic system in special vehicles.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.20-25
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• 2007

KTX is being operated on Kyung-Pu High Speed Railroad Line and Ho-Nam Railroad Line from April 2004. Reduction units is occurring water infiltration at heavy snow and oil leakage because of labyrinth structure. This paper describes design method and evaluation technology to improve structure to prevent water infiltration and oil leakage for reduction units of KTX. This reduction units need high power and high speed to run and they have to make optimal lubricant without change current interface.

• Tribology and Lubricants
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• 제31권1호
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• pp.28-34
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• 2015

This paper addresses the problems of using anti-freeze lubricants for different machines that must function at extremely low temperatures during winter operation in the Republic of Sakha (Yakutia). We discuss the possibility of obtaining anti-freeze base oils from Talakan crude oil, an area with major oil and gas deposits of the Republic of Sakha, and also provide the trade and technological classification of Talakan crude oil. We propose two different schemes for processing Talakan crude oil: the fuel scheme (obtaining light and heavy fractions as a fuel oil) and the base oil scheme (obtaining light fractions and base oils). We investigate the influence of pour point depressants on alkyl-methacrylate base on the low-temperature properties of the fractions obtained from Talakan crude oil and Korean base oils, and establish the optimal concentration of pour point depressants. We compare the properties of these fractions with the low-temperature properties of Korean base oils and find that the commercial oil "Ravenol 0W-40" provides optimistic results. We obtain oil with a pour point of minus $50^{\circ}C$ and a viscosity index greater than 100. The Design of Experiment was used to establish the optimum composition of the pour point depressants and the base oil S-8 to obtain lubricant oil with a kinematic viscosity of 17 cSt, viscosity index of 208, and a pour point of minus $64^{\circ}C$.

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 1993년도 EARTH 발표논문초록
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• pp.18.2-18
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• 1993