• 한국연소학회지
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• 제14권4호
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• pp.25-32
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• 2009

In commercial combustion systems, heavy oil is one of main hydrocarbon fuel because of its economical efficiency. Regarding heavy oil combustion, due to increasing concerns over environmental pollutants such as carbon monoxide, unburned hydrocarbon and nitrogen oxides, development of low pollutant emission methods has become an imminent issue for practical application to numerous combustion devices. Also a great amount of effort has been tried to developed effective methods for practical using of biomass. It is also an important issue to reduce carbon tax. In this paper, an experimental study has been conducted to evaluate the effect of biomass reburning on NOx formation in a heavy oil flamed combustion furnace. Experiments were performed in flames stabilized by a multi-staged burner, which was mounted at the front of the furnace. Experimental tests were conducted using air-carried rice husk powder and LNG as the reburn fuel and heavy oil as the main fuel. The paper reports data on flue gas emissions and temperature distribution in the furnace for several kinds of experimental conditions. NOx concentration in the exhaust has decreased considerably due to effect of reburning. The maximum NOx reduction rate was 62% when the rice husk was used by reburn fuel, however it was 59% when the LNG was used by reburn fuel. The result shows the positive possibility of biomass reburning system for optimal NOx reduction.

• 한국식품영양과학회지
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• 제6권1호
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• pp.49-53
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• 1977

시판(市販) 고가(高價)의 기름에 저렴(低廉)한 기름을 혼입(混入)시키는 일이 흔히 일어나므로 이것을 쉽게 검색(檢索)하기 위한 방편(方便)으로 각 식용유(食用油)의 지방산조성(脂肪酸組成)을 gas chromatography 법(法)에 의해서 조성비(組成比)를 조사(調査)하였으며 이들 지방산(脂肪酸)의 조성(組成)을 보면 참기름은 myristic, palmitic, stearic, linoleic acid와 미량(微量)의 linolenic acid로, 미강유(米糠油)와 대두유(大豆油)는 myristic, palmitic, stearic, oleic, linoleic 및 linoleic acid, 들기름은 palmitic, stearic, oleic, linoleic, linolenic acid, 해바라기 기름은 palmitic, stearic, oleic acid 및 linoleic acid로 이루어져 있다. 이상의 결과로 볼 때 참기름에도 linolenic acid가 극미량(極微量) 밖에 존재하지 않으므로 이것이 풍부한 타(他)의 기름이 혼입(混入)되었을 경우 쉽게 검출(檢出)할 수 있을 것이다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1997년도 춘계학술대회논문집; 경주코오롱호텔; 22-23 May 1997
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• pp.121-127
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• 1997

Normal operation of a workstation in a ship must be secured under any circumstances. Rugged workstation has been imported and there have been many difficulties in maintaining that system such as high cost, delayed after-service and etc. For that reason, a commercial workstation is decided to replace the rugged workstation. But as there is no anti-vibration design in the commercial workstation, a passive vibration isolation system consisted with oil damper and spring is applied. Through theoretical study and experiments, the proposed vibration system is proved to work effectively and make the commercial workstation be able to be used in a ship.

• Asian-Australasian Journal of Animal Sciences
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• 제27권7호
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• pp.1026-1034
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• 2014

This study was conducted to assess the effects of flaxseed oil and dried whitebait as a source of ${\omega}$-3 fatty acids (${\omega}$-3 FA), which could be used to produce eggs enriched with ${\omega}$-3 FA, and of fructo-oligosaccharide (FOS) as a source of prebiotics on performance of hens (commercial Hy-Line Brown laying hens), and FA composition, internal quality, and sensory characteristics of the eggs. Dietary FOS increased egg weight. The amounts of ${\alpha}$-linolenic (ALA), eicosapentaenoic (EPA) and docosahexaenoic acids (DHA) in the eggs from the hens fed the flaxseed oil alone or flaxseed oil+dried whitebait diets were higher than those of the control. Hedonic scores for off-flavor, fishy flavor, buttery taste and overall acceptability of the eggs from the hens fed the diet containing flaxseed oil+dried whitebait were lower (p<0.05) than those of the control. Overall acceptability of the eggs from the hens fed the diet containing soybean oil+dried whitebait was lower (p<0.05) than that of the control. However, all the sensory attributes of the eggs from the hens fed the diet containing flaxseed oil, dried whitebait and FOS were not significantly different from those of the control. These results confirmed that flaxseed oil increases the ALA content in the eggs and a combination of flaxseed oil and dried whitebait increases EPA and DHA in the eggs. Of significance was that addition of FOS to the flaxseed oil+dried whitebait diet improves the sensory characteristics of the eggs enriched with ${\omega}$-3 FA.

• KSBB Journal
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• 제10권5호
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• pp.582-588
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• 1995

해양의 유류유출이 잦은 지역으로부터 crude oil 분해능이 뛰어난 미생물을 분리하여 통정한 결과 Pseudomoans 속으로 판명되였으며, 이를 Pseud$\sigma$ moans sp. CHCS-2로 명 명하였다. 이 균주가 배양 중에 생산하는 biosurf actant의 생생 최적 pH 및 NaCI 농도는 각각 8.0 및 3.0% 였으며, 질소원인 peptone에 영향을 받았다. 2% Kuwait crude oil이 첨가된 배양액을 48, 96, 132시간별로 gas chroma­t tography를 이용, 잔류 oil을 분석한 결과 Kuwait crude oil의 C10-CI4부위에 biosurf actant가 작용하여 분해하였으며, 배양 상층액으로부터 Amberlite XAD-7을 이용한 흡착 chromatography와 Sepha­d dex G-100을 이용한 gel chromatography, 그리고 HPLC를 이용하여 biosurf actant를 분리. 정제한 결과 유화력이 뛰어난 단일 peak를 얻었다. Bio-sur­f f actant 유화력은 $40^{\circ}C$에서 가장 좋았으며, 안정성 은 $30^{\circ}C$에서 $60^{\circ}C$까지의 넓은 온도 범위에서 유지 되었다. 또한, 정제된 biosurf actant를 이용하여 계 연장력에 미치는 영향을 검토한 결과, 상엽적으로 널리 판매되고 있는 Tween 80, Tween 60 그리고 SDS보다 표연장력 저하능력이 뛰어난 것으로 밝혀졌다.

• 한국양식학회지
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• 제7권4호
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• pp.225-237
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• 1994

해산 어류나 갑각류의 유생 사육시 초기 동물 먹이 생물인 rotifer, Brachionus plicatilis를 oil의 종류와 함량을 서로 다르게 첨가한 유지효모로 배양한 결과와, 이 rotifer와 Artemia nauplius에 위에 각 유지효모와 다른 여러 영양강화제로 영양강화한 후 넙치 자어에 공급하여 자어의 성장과 생존을 비교해 본 결과, 다음과 같이 요약할 수 있다. 1. 12종의 유지효모로 rotifer를 배양했을 때 오징어 간유 $15\%$가 첨가된 유지효모의 경우가 가장 좋았다. 2. 오징어 간유 $15\%$의 유지효모로 rotifer를 배양했을 때, rotifer.의 최대성장이 Chlorella ellipsoidea의 경우와 비슷하였고 (140 inds./ml) 나머지 유지효모는 현저히 낮았다. 3. 그러나 오징어 간유 $15\%$의 유지효모로 배양된 rotifer를 넙치 자어에 공급했을 때 자어의 성장과 생존율은 Chlorella의 경우보다 좋았다. 4. 또 영양강화제로 영양강화된 rotifer와 오징어 간유 $15\%$ 유지효모로 배양된 것을 넙치 자어에 공급하여 자어의 성장과 생존율을 비교했을 때도 오징어 간유 $15\%$의 유지효모가 가장 좋았다. 5. 오징어 간유$5\%,\;15\%,\;25\%$ 첨가된 유지효모로 영양강화된 Artemia nauplius를 넙치 자어에 공급했을 때 intact nauplius의 경우보다 자어의 높은 성장과 생존율을 나타냈고, 그 중에서 $25\%$ 함량의 유지효모가 가장 좋았다. 6. Artemia nauplius에 대한 유지효모의 적정 영양강화 시간과 농도는 각각 6시간과, 1.5g/g cyst였으며, 유지효모(오징어 간유 $5\%,\;15\%,\;25\%$)와 여러 영양강화제를 비교했을 때도 오징어 간유 $25\%$의 경우가 자어의 가장 높은 성장과 생존율을 나타냈다.

• 산업기술연구
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• 제25권B호
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• pp.229-239
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• 2005

Dietary powder from Plantaginis ovatae testa was prepared by mechnical milling/grinding of the outer layer of the seed. The crystalline/surface structures of its powder (100 mesh) were examined, and several physical functionalities including, water capacity, oil holding capacity, emulsion/foam properties and physiological functionality such as in-vitro glucose and bile acid retarding effects were also investigated. Water holding capacity(WHC) of psyllium powder was $33.71{\pm}0.10g$ water retained/g solid at room temperature, whileas oil holding capacity(OHC) for soybean or rice bran oil were about 1.80g oil retained/g solid. These values of WHC and OHC were about 5.6 times higher and 2.8 times lower than those of commercial ${\alpha}$-cellulose, respectively. Changes of pH showed a small effect on WHC, but WHC increased with temperature. Emulsion capacity of 2%(w/v) psyllium was about 60% level of 0.5%(w/v) xanthan gum but emulsion stability after incubation of 24 hours showed about 1.4 times improvement of xanthan gum(0.5%,w/v). Also, psylliume(above 2%, w/v) alone had higher foam capacity than that of xanthan(1.1 times) and especially, 1 or 2% addition of psyllium improved the foam stability of protein solution(1% albumin+0.5% $CaCl_2$) by factor of 3.3 and 6.0 times, respectively. The glucose and bile acid retarding effects of psyllium powder were relatively very excellent suggesting the prevention from diabetes and arteriosclerosis. Especially, psyllium showed the 3.7 and 3.3 times higher effect on in-vitro glucose and bile acid retardation than those of commercial ${\alpha}$-cellulose, respectively.

• Tribology and Lubricants
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• 제31권6호
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• pp.251-257
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• 2015

Heavy oil production is receiving significant attention because of increased demands for thermal power generation systems of the diesel engine and boilers. However, asphaltene, which is a heavy oil components (6-8 wt%), reduces the heat efficiency of the fuels owing to its agglomerated sludge of asphaltene during the burning process. Therefore, for hassle-free operation, we should develop asphaltene dispersants to suppress the formation of the sludge. We prepare variable salt-type polymeric dispersants using poly(isobutenyl succinic anhydride) and poly(amine) through both condensation esterification and acid-base neutralization reactions, which we subsequently evaluate for dispersing performance, using Turbiscan measurement. Total acid number (TAN) and total base number (TBN) of 75Lec-25SynDis.2 composed of lecithin and the prepared polymeric salt having the ratio of 3 : 1 are 18.9 and 33.7 mg KOH/g, respectively, which are comparable to those of the commercial dispersants (15.8 and 26.5 mg KOH/g). We determine the initial turbidity observed for 15 min of the polymeric dispersant was determined with transmittance (%), which can be calculated to separability number (SN). The SN value of 75Lec-25SynDis.2 is close to zero, which is superior to that of commercial dispersants and lecithin (0.015 and 0.017).

• 한국식품과학회지
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• 제28권1호
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• pp.77-82
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• 1996

소목을 여러가지 용매로 추출하여 추출물을 얻고, 75% 에탄올 추출물은 다시 용매 분획하여 Rancimat method로 항산화 효과를 비교하였으며 상업용 항산화제인 ascorbic acid, ${\delta}-tocopherol$, BHA, BHT 등과도 항산화력을 비교하였다. Ethyl acetate(EtOAc) 조추출물 600 ppm을 팜유와 돈지에 첨가시 AI (Antioxidant index; 각 항산화제를 첨가한 실험구의 유도기간을 무첨가구의 유도기간으로 나눈 값)는 각각 2.06, 7.40으로 비교적 높았으며 돈지에 대한 항산화 효과가 뚜렷하였다. 75% 에탄올 추출물을 순차 분획하여 얻은 EtOAc 분획물의 항산화 효과는 다른 분획물들 및 조추출물보다 높았고 이 분획물 600 ppm을 팜유와 돈지에 첨가했을 때 AI는 각각 2.07, 7.26으로 EtOAc 조추출물의 항산화력과 거의 같은 수준이었으나 추출 수율은 EtOAc 분획물이 2배이상 더 높았다. 소목 75% 에탄올 추출물의 EtOAc 분획물과 상업용 항산화제 일정량을 팜유와 돈지에 첨가한후 $60^{\circ}C$로 보관하면서 POV와 TBA를 측정하여 항산화 효과를 비교한 결과, 분획물 200 ppm 첨가시의 항산화력은 BHA 및 TO 200 ppm보다 높았고 BHT 200 ppm과 거의 같은 수준이었다. EtOAc 분획물 500 ppm의 항산화력은 BHT 200 ppm보다 높았다.

• 한국작물학회지
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• 제47권
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• pp.175-185
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• 2002

Rapeseed(Brassica napus L.) is an important oil crop as a vegetable oil, concentrated feed and industrial materials. The name "canola" was registered in 1979 by the Western Canadian Oilseed Crushers Association to describe "double-low" varieties. Double low indicates that the processed oil contains less than 2% erucic-acid and the meal less than 3mg/g of glucosinolates. Today annual worldwide production of rapeseed is approximately 35 million tons on 24 million hectares. China accounts for 33% of the world production and the European Economic Community for nearly 32%. Canola ranks 3rd in production among the world's oilseed crops following soybeans, sunflowers, peanuts and cottonseed. The recent advances in genomics and in gene function studies has allowed us to understand the detailed genetic basis of many complex traits, such as flowering time, height, and disease resistance. The manipulation of seed oil content via transgene insertion has been one of the earliest successful applications of modern biotechnology in agriculture. For example, the first transgenic crop with a modified seed composition to be approved for unrestricted commercial cultivation in the US was a lauric oil, rape-seed, grown in 1995. There were also some significant early successes, mostly notably the achievement of 40% to 60% lauric acid content in rapeseed oil, which normally accumulates little or no lauric acid. The name "$\textrm{Laurical}^{TM}$" was registered in 1995 by Calgene Inc. Nevertheless, attempts to achieve high levels of other novel fatty acids in seed oils have met with much less success and there have been several reports that the presence of novel fatty acids in transgenic plants can sometimes lead to the induction of catabolic pathways which break down the novel fatty acid, i.e. the plant recognizes the "strange" fatty acid and, far from tolerating it, may even actively eliminate it from the seed oil. It is likely that, in the future, transgenic oil crops and newly domesticated oil crops will both be developed in order to provide the increased amount and diversity of oils which will be required for both edible and industrial use. It is important that we recognize that both approaches have both positive and negative points. It will be a combination of these two strategies that is most likely to supply the increasing demands for plant oils in the 21st century and beyond.ant oils in the 21st century and beyond.