• Journal of the Korean Professional Engineers Association
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• v.34 no.3
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• pp.16-21
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• 2001

Biominerals are mean of biochemical mineralization and forming for ore depesits of limestone, iron, phosphate and energy minerals, etc . Our Country need in large quantity of biominerals, for example, about a hundred million ton of limestones, fifty million tons of iron ores, three million tons of phosphates, seven hundred million brrels of crude oil, eleven million ton of LNG and sixty million ton of coals per year.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.1
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• pp.249-255
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• 2014

This paper deals with measurement on the economic impact of tax-free oil for Agriculture in Korea. According to increasing of world oil price, the supply policy of agricultural tax-free oil, which specified to support farmers since 1986, are required to expand by farmers. But the supply quantity of tax-free oil is deceased continuously and Korean Ministry of Trade, Industry, and Energy(MOTIE) present stance of sundown policy of tax-free oil for agriculture. In this context, It is necessary and important to measure the economic impact of the supply policy of tax-free oil for agriculture. This study address a econometric method for measurement the economic impact of the supply policy of tax-free oil and suggest several policy implements. Our results show that when the supply policy of tax-free oil for agriculture is annihilated in phases over the five years. the agricultural GDP is decreased by about 3,195 billion korean won and the agricultural price level is increased by 26.6 points after 5 years.

• Journal of Power System Engineering
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• v.22 no.1
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• pp.48-55
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• 2018

It has recently been reported that methanol fuel has been used in the product carrier with established duel fuel engine, which has been greatly reducing emissions of $CO_2$, NOx and SOx from the engine. However, to use methanol alone as fuel oil in a general diesel engine, design modification of cylinder head is needed because the ignition aid device or the duel fuel injection system is needed. On the other hand, only if the mixer is installed on the fuel oil supply line, diesel oil - methanol blending oil can be used as fuel oil for the diesel engine, but there is a problem of the phase separation when two fuels are mixed. In this study, diesel oil and methanol were blended compulsorily in preventing the phase separation with installing agitators and a fuel oil boost pump on fuel line of a test engine. Also, cylinder pressure and fuel consumption quantity were measured according to engine load and methanol blending ratio, and indicated mean effective pressure, heat release rate and combustion temperature obtained from the single zone combustion model were analyzed to investigate the effects of latent heat of vaporization of methanol on combustion stability and characteristics. As a result, the combustion stability and characteristics of 10% methanol blending oil are closest to the those of diesel oil, and it could be used as fuel oil in existing diesel engines without deterioration of engine performance and combustion characteristics.

• Preventive Nutrition and Food Science
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• v.5 no.1
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• pp.10-14
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• 2000

A simple and rapid method was developed to prepare a large quantity of highly pure conjugated linoleic acid (CLA) chemically-synthesized from safflower seed oil (SSO). CLA-SSO(74.9% in purity) was synthesized from fresh SSO(79.9% of linoleic acid) by alkaline isomerization at 18$0^{\circ}C$. Urea(50g) and CLA-SSO (25g) were completely dissolved in ethanol (750ml) using a water bath(5$0^{\circ}C$) and followed by refluxing for 60 min. The resultant was cooled to room temperature and stored in a cold room (4$^{\circ}C$) for 24hrs. After removing the urea adduct by filtration, the filtrate was rotoevaporated under 4$0^{\circ}C$ and the residue was dissolved in hexane (200ml). The hexane extract was washed with distilled water (100ml$\times$3) and dried over sodium sulfate anhydrous. This urea treatment procedure was repeated three times. The purity of CLA recovered from the hexane extract was 95.0%. This method can be applied to prepare a large quantity of highly pure chemically-synthesized CLA (>0.5kg/a batch) from any plant oils containing high percentages (>70%) of linoleic acid.

• Journal of the Korean Society of Marine Environment & Safety
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• v.5 no.2
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• pp.1-14
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• 1999

To find characteristics and areas of greater risk of oil spill at the coastal waters in Korea, some of risk factors were analyzed with historical data of oil spill and marine traffic. As a result, it is characterized that frequency of oil spill is increasing year by year and greatest percentage of spill source is fishing boat. It is proposed that the ports of Ulsan, Yeosu, Incheon and Pusan will be designated as primary area of risk as they have a higher risk of oil spills and its response authority is required to maintain appropriate regional response capability for prompt and effective response to a future spill incident. In addition, the regional response equipments at Ulsan are examined under a assumption of a medium size spill and it is found that the use of chemical dispersant can be an alternative when mechanical containment and recovery is not feasible in this area, and the existing response equipments may be appropriate to address that size of spill. However, the response authority is required to maintain more numbers of stronger boom for unsheltered waters and more quantity of concentrate dispersant to disperse all spilled oils on the water, furthermore the response authority should be prepared for a possible future catastrophic spill with sufficient equipments.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.15 no.6
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• pp.77-82
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• 2016

When drilling through Inconel 601 nickel-chromium-based alloys, a large amount of cutting oil is required to prevent tools from wear and fracturing due to heat buildup resulting from the high temperature resistance and toughness of this alloy. However, cutting oil supply has become a factor compromising the machining environment, and this has caused attention to shift to a more environmentally friendly cutting fluid supply system called minimum quantity lubrication (MQL). Our aim in this study was to find a more efficient drill processing method using MQL, and to verify its performance. To that end, we proposed a sealed cover, a step feed, and POSS-type cutting oil as measures to increase the effectiveness of MQL in view of the cutting force and tool wear, and established an improvement in efficiency using the proposed measures.

• Tunnel and Underground Space
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• v.3 no.1
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• pp.24-32
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• 1993

Groundwater movement is one of the most important elements in the construction and management of underground oil storage cavern. To control the groundwater flow, grouting is run in parallel with water curtains. But as traditional grouting is conducted within cavern before and after excavation, the effect of grouting is delayed and the injection sphere is limited in the rock mass. Therefore, it is desirable to introduce a more extensive and effective grouting. This article is to present the caly grouting, which was the first to be carried out in the construction of underground caverns for oil storage in Japan. After conducting the clay grouting, the effect was confirmed by ground water level and infiltration quantity to the caverns.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2009.11a
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• pp.101-105
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• 2009

The purpose of this study is to reduce autogenous shrinkage of high-strength concrete. Previous studies were investigated to measure the effects of reductions to autogenous shrinkage when applying bean oil to concrete. The results of the study showed that as the mixture rate of BO increased, fluidity decreased and air quantity decreased slightly. In early age, compressed strength increased compared to Plain while decreased in long-term age. As an autogenous shrinkage characteristic, reduction effect increased according to increase in mixture rate. When mixture rate is 1%, approximately 30% decreased compared to Plain in BO. At 2%, BO decreased by about 32%. In addition, in the case of BO, autogenous shrinkage was shown to decrease compared to expansive additive and shrinkage-reducing agent.

• Journal of Advanced Marine Engineering and Technology
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• v.12 no.1
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• pp.28-36
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• 1988

Since the oil shocks of 1970s, the quality of the fuel oil for marine diesel engines has become more degarded than ever. When the poorer quality fuel is burned, carbon residues of the fuel oil cause blockage of the fuel injection valve nozzle and troubles of fuel injection system. The mis-firing of engine occurs due to the decrease of fuel quantity injected, the decrease of compression pressure in the slow speed range, the increase of fuel leaked and the high ignition temperature of degraded fuel etc. This paper is to investigate theoretically the effects of mis-firing on the crankshaft axial vibration of diesel engine. The cylinder pressure in operation is calculated by the computer aided simulation of closed cycle for a large two-stroke diesel engine and also the exciting force of axial vibration and the resonance amplitudes are calculated. And then, the condition of normal state, misfiring and one-cylinder cut-off operation are analyzed. The results of calculations show good agreements with those of the actual measurements.

• Journal of Life Science
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• v.18 no.12
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• pp.1665-1670
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• 2008

Soybean oil is an important source of vegetable oil for human food and nonfood applications and accounts for approximately 22% of the world's total edible oil production. Improvement of the quality and quantity of soybean seed oil constituents is one of the most important objectives in soybean breeding. The objective of this study was to identify quantitative trait loci (QTLs) that control oleic, linoleic, and linolenic acid contents in soybean. The 117 $F_{2:10}$ recombinant inbred lines (RIL) developed from a cross of 'Keunolkong' and 'Shinpaldalkong' were used. Narrow-sense heritability estimates based on a plot mean on seed weight, protein and oil content were 0.85, 0.82 and 0.81, respectively. Eight independent QTLs for oleic acid content were identified from linkage group (LG) A2, C1, D2, F, G, L, and O. Seven QTLs for linoleic acid content were located on LG D1b, E, H, I and L. Oil content was related with five QTLs located on LG C1, H, J, K, and L. Oleic, linoleic, and linolenic acid have two common QTLs on LG C1 and L. Thus, we identified major loci improving soybean oil quality.