• Journal of the Korean Institute of Gas
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• v.19 no.6
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• pp.105-109
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• 2015

In this paper is proposed for the oil return device developed to perform efficient emergency operation in the event the sea oil spill. Oil recovery apparatus for spilled oil on marine aims to quickly purged with high recovery. Oil recovery apparatus can prevent secondary pollution which may occur in the purification method using the adhesion agent and chemicals. Also it has excellent properties oil recovery. Adopted by the vapor explosion-proof mechanism to remove the risks that may occur during oil recovery operations.

• Annual Conference on Human and Language Technology
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• 2010.10a
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• pp.166-171
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• 2010

본 논문은 한국어 온라인 리뷰 문서의 오피니언 분류(Opinion Classification)에 있어 그 핵심 키워드가 형용사 (Adjective) 범주라는 점을 고려하여, 한국어 형용사를 <문맥에 의존하지 않는 절대 극성>과, <문맥에 의존하여 극성이 바뀌는 상대극성>으로 대분류한 뒤 그 각각의 의미 극성을 하위 분류하는 작업을 수행하였다. 기존의 연구에서 특징적인 오피니언 어휘 수십개에 의존하여 자동 분류를 시도하고자 하였던 문제점을 극복하기 위해서는 한국어 형용사 전체 범주에 대한 체계적인 극성 분류가 이루어져야 할 필요가 있으며, 여기서 특히 상세히 주목받지 못했던 상대 극성 어휘에 대한 본격적인 의미 분류가 요구된다. 본 연구에서 제시하는 형용사의 극성 분류는 기존의 이론 언어학적 형용사 의미 분류와 달리 온라인 오피니언 문서에서 도메인에 따라 나타나는 특징적 의미 유형을 결정하고, 이를 기준으로 온라인 오피니언 문서의 극성 판별에 효과적으로 적용할 수 있는 사전을 구축하였다는 점에서 의의를 가진다.

• Korean Journal of Soil Science and Fertilizer
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• v.18 no.1
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• pp.50-57
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• 1985

An attempt was made to determine the optimum levels of sewage sludge application for seogwangbyeo in the farmer's field. 1. Optimum amount of sewage slude application was 338kg/11a at the fertilizer (N-P-K) level of 15-10-10kg/10a, 430kg/10a at that of 7.5-10-10kg/10a and 544kg/10a at no fertilizer. 2. Number of tillers during all growing period were increased with amounts of sewage sludge and/or chemical fertilizers. 3. Panicles per hill was increased but percent ripeness was decreased with the application of increasing level of sewage sludge and/or chemical fertilizer. In particular, the decrease of ripeness among yield-related components sotood out as an important one to be solved for higher yield. 3. Panicles per hill was increased but percent ripeness was decreased with the application of increasing level of sewage sludge and/or chemical fertilizer. In particular, the decrease of ripeness among yield-related components stood out as an important one to be solved for higher yield. 4. Ripeness was remarkably decreased in high nitrogen content of soil and rice plant under heavy amounts of sewage sludge and/or chemical fertilizer. 5. Ripeness that had direct effect on yield showed significantly possitive correlation with the content of $SiO_2$ and $SiO_2/N$ in rice plant from 25 days after transolanting to harvesting stage. 6. Maximumutillzation of nitrogen and its production efficiency of absorbed nitrogen in sewage sludge were 16.6% and 31.9kg (Yield/kg, N) at the level 15-10-10kg/10a as fertilizer with amounts of sewage sludge application, and 19.0% and 31.8kg (yield/kg, N) at sewage sludge application without fertilizer.

• Journal of the Korean Society of Food Science and Nutrition
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• v.40 no.8
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• pp.1086-1091
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• 2011

Anti-oxidative activity and tyrosinase inhibitory activity of various ethanol extracts of Polygoni multiflori radix (PMR) and Cynanchi wilfordii radix (CWR) were compared to identify an anti-oxidant and whitening agent source from nature. We conducted an investigation into the anti-oxidant activities of PMR and CWR ethanol extracts by measuring total polyphenol content, total flavonoid content, and ABTS radical capacity. The total polyphenol contents of PMR and CWR were 17.31${\pm}$0.54 mg GA/eq g, and 2.75${\pm}$0.22 mg GA/eq g, respectively. The total flavonoid contents of PMR and CWR were 6.38${\pm}$0.39 mg naringine/eq g, and 1.34${\pm}$0.09 mg naringine/eq g, respectively. The 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) radical decolorization of PMR and CWR were 96.89${\pm}$0.21% at 1 mg/mL and 93.49${\pm}$0.76% at 50 mg/mL. Melanoma cells were cultured with the PMR and CWR ethanol extracts for 48 hr, and total melanin content as a final product and the activity of tyrosinase, a key enzyme, in melanogenesis, were estimated. The PMR and CWR ethanol extracts increased melanin content and tyrosinase activity in a dose-dependent manner. These results suggest that PMR and CWR ethanol extracts could be useful as a skin whitening agent.

• Korean Journal of Soil Science and Fertilizer
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• v.18 no.2
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• pp.113-120
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• 1985

A filed experiment was carried out to investigate the effects for growth, yield of red lopper (Saelona) and properties of soil by beer sewage sludge application to the sandy loam which fertility was common. The results obtained were summerized as follows. 1. Growth of red pepper in sludge plot was very poor by drought in early stage, but color of loaves was green and growth strength was better than nontreated plot after rainfall in last stage. There were no significant differencies between plant height, number of branch on main stem and stem height in sludge and standard plot. 2. Yield of matured red pepper per plant in NPK+, and PK+ sludge 1200kg, 2400kg and 4800kg/10a plot were less than those in standard plot respectively. 3. Ratio of dry weight of matured red pepper in NPK+, and PK+ sludge 1200kg, 2400kg and 4800kg/10a were high than those in standard plot appreciably. 4. Sewage sludge application (1200kg/10a. N=51kg) was available as nitrogen source of organic fertilizer considerably, but there were some growth inhibition by excess of amount applied. 5. Sewage sludge application decreased the pH of the soil and increased the content of organic matter and exchangeable babe in the soil appreciably.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.1
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• pp.579-584
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• 2017

The damper oil seal of a high-speed railway vehicle is made from nitrile butadiene rubber (NBR) in order to prevent lubricant from leaking into the damper and to stop harmful contaminants from entering the external environment while in service. Oil leakage through the seal primarily occurs from fatigue failure of the damper. Cumulative damage of the seal occurs due to the contact force between the rod and the rubber during movement due to track irregularities and cants, among other factors. Thus, the design of the oil seal should minimize the maximum principal strain at weak points. In this study, the optimal cross section of the damper oil seal was found using the multi-island genetic algorithm method to improve the durability of the damper. The optimal shape of the oil seal was derived using process automation and design optimization software. Nonlinear material properties for finite element analysis (FEA) of the rubber were determined by Marlow's model. The nonlinear FEA confirmed that the maximum principal strain at the oil leakage point was decreased 24% between the initial design and the optimum design.

• Food Science and Preservation
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• v.24 no.6
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• pp.813-819
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• 2017

This study carried out to determine the physicochemical components of Cynanchi wilfordii Radix (CWR) fermented with Rhizopus delemar. The physicochemical components such as changes on moisture content, pH, total acidity, reducing sugars, and the contents of free sugars, free amino acid, cynandione A were investigated. The moisture content of fermented CWR was increased after 4 days of fermentation. The pH value of fermented CWR was decreased after 4 days of fermentation. The reducing sugars contents were in the range of 1.42-1.69%. The major free sugars were identified as rhamnose, glucose, fructose and sucrose. The content of free sugars was decreased during fermentation process of CWR while the glucose contents in 80% ethanol and water extracts were increased. In addition, the free amino acid increased significantly during fermentation. Finally, The content of cynandion A of the fermented CWR was highest at the level of 14.09 mg/g on the $8^{th}$ day. These results are indicated that fermentation with Rhizopus strains could be used to increase the bioactivity of CWR and the fermented CWR can be used as a functional material and edible resource in the food industry.

• Microbiology and Biotechnology Letters
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• v.42 no.2
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• pp.139-144
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• 2014

This study examined the efficacies of Cynanchum wilfordii and Phlomis umbrosa extracts on serum insulin like growth factor-I (IGF-I) and bone growth by raising rats in vivo. C. wilfordii and P. umbrosa extracts significantly increased serum IGF-I by 42% and 22% than the control, respectively. Treatment with ${\alpha}$-amylase when manufacturing these extracts remarkably increased the concentration of IGF-I by 63% and 36% above the control, respectively. This meant that these extracts, especially ${\alpha}$-amylase treated extracts, maintained a higher level of IGF-I secretion in the treated groups. In addition, increases of 6% in femur length were found after 8 weeks of oral administration with these extracts. These results indicate that C. wilfordii and P. umbrosa extracts have beneficial effects on bone growth via IGF-I.

• Land and Housing Review
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• v.14 no.4
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• pp.47-62
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• 2023

Using the dynamic panel model, this study investigates rent determinants for small and medium-sized office buildings in Korea's CBD and Gangnam areas, key business districts. The results reveal that rents for small and medium-sized office buildings in CBD and Gangnam areas are influenced by macroeconomic fluctuations and characteristics of buildings and locations, suggesting a market with both spatial consumer and investment goods attributes. There are several investment implications as follows. First, even if the location in the CBD area is advantageous, the practical limitations in renovating aging small and medium-sized office buildings must be taken into account when investing. Second, parking conditions are a key factor influencing rent prices in CBD areas, so evaluating the parking facilities and improvement potential of small and medium-sized office buildings is essential for investors. Finally, due to the high sensitivity of Gangnam's small and medium-sized office market to macroeconomic trends, it's vital to prioritize monetary policy shifts as a key factor in investment decisions.

• Journal of the Korean Chemical Society
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• v.54 no.1
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• pp.88-92
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• 2010

Isopropyl mercaptan is an important pharmaceutical intermediate and chemical material. And thiourea and triglycol are the main materials for the synthesis of isopropyl mercaptan. Therefore the dissolution of thiourea in triglycol solution is very important for the production of isopropyl mercaptan. The aims of this study are to examine the dissolution kinetics of thiourea in triglycol solution, and to present an alternative process for producing isopropyl mercaptan. In order to investigate the dissolution kinetics of thiourea in triglycol solution, the concentrations of solution and reaction temperature were selected as experimental parameters. It was determined that the dissolution rate of thiourea increased with the increase in solution concentration and temperature. An empirical equation was used in fitting the data. Statistical analysis indicated small errors and the results should be reliable.