• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.11a
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• pp.583-587
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• 1998

본 논문에서는 대형 탱커선의 의무 장비인 유배출 감시 장비 (Oil Discharge Monitoring Equipment)를 위한 유분 농도계의 설계에 대하여 연구하였다. ODME는 국제해사기구 (IMO)에서 일정 ton 이상의 대형 선박에 의무적으로 설치하도록 규정하고 있으며 이는 날로 심각해지는 해양 오염을 방지하는데 목적이 있다. ODME의 구성 요소는 중앙 제어 장치, 유분 농도계, 유량계, 선속계, Sampling System, 배출 제어 장치로 이루어져 있으며 이중 가장 중요한 것은 유분 농도계이다. 이는 선박에서 배출되는 물에 포함된 유 성분을 ppm 단위로 계측하는 것이다. 이를 위한 탁도 측정 방법에는 여러 가지가 있지만, 본 연구에서는 선박에서 사용이 용이한 광산란 방식과 방폭성을 가지는 광섬유를 이용하여 탁도를 측정하는 유분 농도계를 설계하였으며 아울러 이에 대한 탁도 계산 알고리즘에 대하여 고찰하였다. 측정의 정밀도는 0-999ppm 범위에서 $\pm$5%의 오차 이내로 측정이 가능함을 보였다. 이는 IMO의 규격 ($\pm$10%의 오차)에 만족하는 수치이다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2016.11a
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• pp.200.2-200.2
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• 2016

무전해 도금용 팔라듐 촉매액 중의 팔라듐 이온과 주석이온의 농도비($Sn^{2+}/Pd^{2+}$), 염산의 농도 및 첨가제의 농도 등은 촉매액의 안정성 및 흡착력에 영향을 미치는 것으로 알려져 있다. 무전해 도금용 콜로이드 타입 팔라듐 촉매액에 요구되어지는 특성으로는 1) 액 안정성이 양호하여 장시간 연속 사용에 있어서 나노입자의 응집 및 침전이 없을 것 2) 피도금체 표면에 흡착력이 양호할 것 3) 촉매활성이 충분하여 다음 공정인 무전해 도금피막의 초기석출성이 양호할 것 등이다. 본 연구에서는, 콜로이드 타입 팔라듐 촉매액 중의 염산 농도 및 금속이온의 농도비($Sn^{2+}/Pd^{2+}$), 첨가제를 변화시켜 촉매액의 안정성 및 촉매활성에 미치는 영향을 조사하였다. 그 결과를 시판의 팔라듐 촉매액과 비교하여 보고한다.

• Journal of the East Asian Society of Dietary Life
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• v.18 no.6
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• pp.1007-1013
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• 2008

This study was conducted to investigate change in the quality of white pan bread as affected by various concentrations of Corni fructus powder. Breads were prepared by addition of 0, 1, 2 and 3% of Corni fructus to wheat flour of basic formulation. The moisture content of white pan bread was approximately $37.5{\sim}41.1%$ and decreased with increasing Corni fructus powder concentration. The pH of white pan bread also decreased with increasing Corni fructus powder concentration. In color values, with increase of Corni fructus powder concentration, L, a value decreased and a value increased in the crumb. The weights of bread cooled for 0, 1 hour and 3 hour after baking decreased with increasing Corni fructus powder concentration. The volume and height of dough increased with increasing Corni fructus powder concentration. However, no significant differences in the specific volume and yield of dough were found. The baking loss rate was higher in the breads with Corni fructus powder than in the control. In the texture characteristics, hardness, gumminess and chewiness of bread significantly decreased with increasing Corni fructus powder concentration and adhesiveness, cohesiveness increased. In the sensory evaluation, when compared to the control, the bread added to 1% of Corni fructus powder was superior texture and taste and flavor, while was similar to color.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.23-24
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• 2020

커피박을 FeCl₃·6H₂O로 전처리하여 제조한 자성 복합재의 유출유 회수 실험을 진행하였다. 전반적으로 사용하지 않은 디젤엔진 오일이 사용한 디젤엔진 오일보다도 오일 회수율이 높게 나타났고, 수중온도가 5℃일때보다도 25℃일 때 오일 회수량이 더 높게 나타났다. 실험 결과는 모든 온도에서 오일 회수량을 높이기 위해서는 FeCl₃·6H₂O 전처리 용액의 농도가 최소한 0.1 M은 되어야 함을 보여 주었다.

• Korean Journal of Food Science and Technology
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• v.40 no.1
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• pp.96-100
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• 2008

Pungent oils are fat sources that determine the taste, flavor, and satiety of foods. They are also energy sources and regulators of lipid metabolism in humans. The present study was performed to evaluate the effects of red pepper (Capsicum annuum L.) seed oil (RPO) and sancho (Zanthoxylum schinifolium) seed oil (SCO) as pungent oils on the lipid profiles of rats fed on hypercholesterolemic diets (0.12% cholesterol), as compared to common soybean oil (SBO). There were large differences in the n-6/n-3 fatty acid ratios of the experimental oils (SBO: 8.8, SCO: 1.2, RPO: 70.1). Serum cholesterol concentrations were higher in the RPO groups than in the other groups; whereas ratios of HDL-cholesterol/total cholesterol were lower in the RPO groups. On the other hand, liver cholesterol levels were markedly higher in the SCO groups than in the RPO groups, with the SBO groups having intermediate levels; these largely reflected cholesterol ester content differences in the rat livers. It is possible that the different serum cholesterol responses observed in the RPO and SCO groups might have been related to differences in the n-6/n-3 fatty acid ratio rather than the polyunsaturated fatty acids/saturated fatty acids ratio. Serum triacylglycerol concentrations were lower in the SCO groups as compared to the other groups. Overall, the results showed a hypocholesterolemic effect for sancho seed oil as compared to red pepper seed oil in rats fed diets containing 0.12% cholesterol.

• Korean journal of applied entomology
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• v.35 no.2
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• pp.164-172
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• 1996

The comparative toxicity of abamectin to the predatory mite, Amblyseius womersleyi Schicha and the spider mites, Tetranychus urticae Koch and T. kanzawai Kishida was evaluated by leaf disc method. Abamectin was much less toxic to A. womersleyi than to the spider mites. Although survival rate of adult females of A. womersleyi tended to decrease with increasing abamectin concentration, 8-78% of predators remained alive at concentrations of 0.38-6 ppm. Likewise, reproduction was significantly reduced with increasing abamectin concentration. Abamectin neither affect the hatch of A. womersleyi eggs nor the development of surviving immature predators. Survival of immature predators decreased with increasing abamectin concentration. However, 42-90% of immature predators reached adulthood at 0.38-3 ppm. Adult female predators survived on a diet of spider mites intoxicated with abamectin, although their fecundity and the sex-ratio of the progeny were significantly affected. Abamectin at selective sublethal concentrations (0.38-0.75 ppm) could he of value in adjusting predatorlprey ratios in integrated management of T. urticae and T. kanzawai.

• The Korean Journal of Zoology
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• v.32 no.1
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• pp.1-8
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• 1989

Non-diapausing larvae and diapausing pupae of Pieris rapae L. were treated with 20-HE and JH, and the concentration of 20-HE and JH in body were also measured to determine mechanisms of diapause induction and termination. When early last instar larvae of non-diapausing stage were injected with 20-HE or JH-I, diapause was not induced in both cases. 20-HE concentration of pre-diapausing last instar larvae was very low, and 20-HE peak of non-diapausing two-day-old pupae was not present in diapausing pupae. There was no difference in concentration of JH-I between diapausing and non-diapausing stages. When early and late diapausing pupae were injected with 20-HE, JH-I, or JH-III. diapause was terminated by 0.1-0.5 $\mu$g of 20-HE, but not by JH-I, or JH-III. The above results indicate that diapause of Pieris rapae was induced by decrease of 20-HE concentration and also terminated by gradual accumulation of 20-HE during diapause process.

• Journal of the Korean Society of Food Science and Nutrition
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• v.22 no.5
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• pp.543-551
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• 1993

This study was designed to observe the effects of the feeding mixed with the sardine oil containing n-3 EPA, DHA and the safflower oil in which rich n-6 linoleic acid on the improvement of the lipids and on the fatty acid matabolism of serum lipoprotein in the dietary hyperlipidemic rats. Experimental oils mixed with 16% butter(control group) and 8% butter+8% olive oil, 8% butter and various level of sardine and safflower oils were administered to the male rats of the Sprague Dawley for 4 weeks. Concentrations of total cholesterol in serum lipoproteins were highest in the LDL, followed by VLDL, HDL and chylomicron components. in the triglyceride concentrations, chylomicron were highest, and much VLDL, LDL, HDL components. There were highest in the HDL, followed by LDL, VLDL and chylomicron in phospholipid concentrations of serum lipoproteins. Concentrations of total cholesterol, triglyceride and phospholipid in serum lipoprotein were lower in the other groups than in the control groups, and particularly, lowest in the group 5(4% sardine oil+4% safflower oil). From this results, the feeding equal quantity mixed oil with n-3 PUFA rich sardine oil and n-6 PUFA rich safflower oil were effective on the improvement of the lipid composition in the serum lipoprotein. It might be due to the effects of appropriate rations of P/S, 0.85 and n-6/n-3P, 2.85 in the test lipids. In the fatty acid composition of serum lipoprotein, ratio of P/S and n-3/n-6P were influenced from the fatty acid compositions of the mixed test lipids. And EPA contents were higher in the chylomicron components.

• Analytical Science and Technology
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• v.18 no.3
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• pp.232-240
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• 2005

The total PCBs level in the transformer insulation oil samples using GC/ECD and HRGC/HRMS were ranged from 0.087 to $223.6{\mu}g/g$ and ranged from N.D. to $154.04{\mu}g/g$, respectively. The calculated TEQ values were ranged from 0.00067 to 6.8 ng WHO-TEQ/g. Among the samples, 6 samples showed higher than 2 ppm concentration (specific waste criterion of Korea). A variety in the concentration of total PCBs were observed between ECD and HRMS analysis. This is maybe due to quantification mehtod. The Aroclor 1248 wasn't present in the samples. The distribution pattern of Co-PCB congeners showed that the ratio of monoortho substituted congeners were higher than non-ortho substituted congeners. Among that, PCB-167 congener was predominant. In addition, the distribution of Co-PCBs congeners was different with that of flue gas and ambient air samples as well as commercial PCB formulations (Aroclor, Kanechlor).

• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.435-436
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• 2009

In this paper, the absorption line of $NH_3$ is investigated by photoacoustic effect. And then an experiment with CO2 laser is conducted to demonstrate a method of measuring the intensity of NH3 using absorption line.