• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.65-69
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• 2005

SWAT 모형은 우리나라 논 지역에서의 수리관행을 이행할 수 있도록 관개용수의 공급과 담수지역에 대한 성분해석에 대한 기본적인 틀을 갖추고 있으며, 각종 물관리 체계의 조작이 가능한 우수한 모형이다. 그러나, 실제 우리나라 농업지역에 관개용수를 공급하고 담수상태의 논 지역을 충분히 모사하지 못하고 있다. 따라서, 이러한 결함을 제거하기 위해서는 SWAT 모형의 관개용수공급과 관련한 내부 모듈의 전면적인 수정$\cdot$보완과 교체작업이 필요하였다. 이러한 SWAT 모형의 문제점 해결을 위해 우리나라 는 농사의 특징인 담수를 고려하고, 관개량 및 관개일정을 제어하여 담수 논에 대한 수문성분이 전체 하천유출을 포함하는 수문순환 과정에 미치는 영향을 정량적으로 평가할 수 있는 SWAT-AGRIMAN(SWAT-AGRIculture MANagement) 모형을 개발하였다. 개발된 SWAT-AGRIMAN 모형을 보청천 기대교 상류유역에 적용하였고, 적용결과를 SWAT 모형에 의한 모의결과와 비교$\cdot$평가하였다. 관개용수의 수원의 제기능 여부 및 담수상태의 유지여부와 논의 침투량 및 증발산량, 유역 출구에서의 유출량의 변화특성을 살펴보았으며, 실제 관측유량과의 유출율, 평균제곱근오차(RMSE), 모형효율계수(ME), 상관계수(CORRL), 결정계수($R^2$)의 비교$\cdot$분석을 통해 모형을 평가하였다.

• Environmental Analysis Health and Toxicology
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• v.19 no.2
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• pp.177-182
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• 2004

Alcohol consumption and exposure to endocrine disruptors and industrial solvents have been implicated in impaired spermatogenesis, increase in the incidence of malformed sperm and decrease in the percentage of moving sperm. The aim of this study was to determine and compare the direct effects of some organic solvents(bisphenol A; BPA, dibutyl phthalate; DBP, formaldehyde; HCHO, dimethylsulphoxide; DMSO, ethanol) on mucus penetration distance, motility and survival rate of human sperm in vitro. Semen samples from 3 health subjects were prepared using swim-up method and 0.0005-0.5% organic solvents were added to the test medium. BPA, DBP, HCHO and DMSO produced significant decreases in the motility and survival rate with a different potency. The most potent inhibition of mucus penetration distance, motility and survival rate was observed after exposure to HCHO. A concentration of 0.0005% HCHO significantly inhibited sperm motility. When ethanol m.: added directly to sperm, at concentrations equivalent to that in serum after heavy drinking, these damaging effects were lowest compared with other solvents. Present study shows that each compound has different toxic potency to human sperm and we need special caution for the use of HCHO.

• Korean Journal of Poultry Science
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• v.20 no.1
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• pp.33-41
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• 1993

Among the several factors that affect shelf-life of washed shell eggs, storage temperature and relative humidity were the most important. Besides those factors listed above, temperature of washing water, composition of foreign substances and washing method of eggs were also the factors affecting the shelf-life of the eggs. The effect of sanitizer treatment was significant in extending the shelf-life of eggs compared with washed and unwashed eggs. In case of oil coating treatment, the shell eggs treated showed the better results than that of washed and unwashed eggs because the coating materials prevented the moisture evaporation from the inner shell eggs and kept the contamination of microorganisms from the environment. Consequently, it is considered that reducing egg shell contamination of microorganisms and proper treatment could be the key to extend the shelf-life of shell eggs.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.11a
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• pp.43-48
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• 2003

This paper investigate that the effect of the concrete containing mineral admixtures(pozzolanic materials such as fly-ash, ground granulated blast-furnace slag, silica fume and meta kaolin) on the resistance properties to chloride ion invasion. The purposed testing procedure was applied to the concrete added mineral admixtures for 3~4 replacement ratios under W/B ratios ranged from 0.40 to 0.55. For the electrical migration test, Tang and Nilsson's method was used to estimate the migration coefficient of chloride ion. As a results, the W/B ratios, kinds of admixture and replacement ratios, water curing periods had a great effect on the migration coefficient of chloride ion, and the optimal replacement ratios of admixture had a limitation for each admixtures. Also, the addition of mineral admixtures by mass(replacement of OPC) enhanced the resistance of the mixture to chloride penetration compared with the plain concrete. The amount of acid soluble chloride ions and water soluble chloride ions were varied with the kinds of mineral admixtures. The compressive strength was shown related to the migration coefficient of chloride ion, the compressive strength increased with the decreasing migration coefficient of chloride ion. Below the 50MPa, the variation of migration coefficient of concrete added mineral admixtures was bigger than plain concrete.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.05a
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• pp.43-48
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• 2003

This paper investigate that the effect of the concrete containing mineral admixtures(pozzaolanic materials such as fly-ash, ground granulated blast-furnace slag, silica fume and meta kaolin) on the resistance properties to chloride ion invasion. The purposed testing procedure was applied to the concrete added mineral admixtures for 3∼4 replacement ratios under W/B ratios ranged from 0.40 to 0.55. For the electrical migration test, Tang and Nilsson's method was used to estimate the migration coefficient of chloride ion. As a results, the W/B ratios, kinds of admixture and replacement ratios, water curing periods had a great effect on the migration coefficient of chloride ion, and the optimal replacement ratios of admixture had a limitation for each admixtures. Also, the addition of mineral admixtures by mass(replacement of OPC) enhanced the resistance of the mixture to chloride penetration compared with the plain concrete. The amount of acid soluble chloride ions and water soluble chloride ions were varied with the kinds of mineral admixtures. The compressive strength was shown related to the migration coefficient of chloride ion, the compressive strength increased with the decreasing migration coefficient of chloride ion. Below the 50MPa, the variation of migration coefficient of concrete added mineral admixtures was bigger than plain concrete.

• KDI Journal of Economic Policy
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• v.18 no.3_4
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• pp.129-181
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• 1996

산업구조변화의 일반적인 추세는 나라마다 비슷한 모습을 보인다. 그러나 국가별, 산업별로 관찰해 보면 구조변화의 방향과 경로가 상당히 다양할 뿐 아니라 구조조정의 성과도 다르게 나타나고 있다. 본고(本稿)에서는 한국의 산업구조변화가 산업특성별로 어떻게 다른 모습을 보이고 있으며, 선진국들과 비교할 때 어떤 다른 특징이 관찰되는지를 검토함으로써 구조조정의 내용과 성과를 평가하고 정책적 시사점을 도출하고자 한다. 구조조정의 성과에 대한 평가의 근간은 "경제발전의 원동력은 혁신능력에 있다"는 "슘페터"의 명제에 두고 있다. 혁신집약적 산업활동의 비중변화를 기준으로 산업구조조정의 성과를 분석함에 있어 다음의 두가지 문제에 봉착하게 된다. 첫째, 혁신집약적 산업활동을 측정하기 위해 어떤 지표를 사용할 것인가, 둘째 혁신집약적 산업활동을 어떤 수준으로 분류할 것인가이다. 본고(本稿)에서는 산업별 연구개발 집약도를 혁신집약적 산업활동의 대용변수로 사용하여 혁신집약도의 정도에 따라 산업을 첨단기술산업, 중간기술산업, 재래기술산업의 세가지로 나눈 다음 수출구조변화, 생산 고용 부가가치 구조변화, 생산성 변화를 분석하였다. 제조업 수출에서 차지하는 첨단기술산업의 비중을 기준으로 한다면 구조고도화는 매우 빠르게 진전되었다. 첨단기술산업은 수출비중도 높지만 수입침투율도 가장 높다. 특히 수출주도의 고성장이 이루어졌던 1986~88년, 1994~95년 기간에 수출구조의 고도화도 급격히 이루어졌다는 사실은 해외경쟁에 노출되어 있는 수출부문이 제조업 구조고도화를 선도하고 있음을 시사하고 있다. 이에 비해 국내수요를 포함한 한국 제조업 전체의 생산, 고용, 부가가치 구조를 분석해 보면 수출부문에 비해 구조조정 성과가 상대적으로 낮은 것으로 평가된다.

• Journal of The Korean Society of Agricultural Engineers
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• v.55 no.6
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• pp.37-46
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• 2013

Many factors about the stability for the reservoir embankments is determined when the facility is completed. Therefore the initial design of the embankment is important. Many researchers focused the effect of soil parameters although the cross section greatly affects the stability and can be controlled in design step. The objective of this research is to analysis of the effects for the safety factor of slope and seepage according to change cross-section in embankment. As a result, the quantity of seepage decreased as the gradient of downstream slope decreased and was proportional to the height of embankments. There was a linear relationship between the gradient of slope and the safety factor of slope. However the gradient of slope did not affect other side slope. All in a relationship, regressive equations with a high correlation coefficient were calculated and can be applied the simple estimation method of the stability using the cross-section. As results of analyzing the sensitivity, the friction angle and permeability critically effect for the slope stability and the seepage, respectively. The effect of the slope gradient was similar to major soil properties.

• The Journal of the Korean bone and joint tumor society
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• v.13 no.2
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• pp.201-206
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• 2007

It is a well-accepted tenet that wide surgical margins are necessary for the treatment of soft-tissue sarcomas, and it is still true that the rate of recurrence depends on the adequacy of the surgical margins. Sarcomas that rest directly against bone pose a dilemma for the surgeon. A wide margin is not possible in the literal sense without excision of the bone. Whereas reconstruction of skeletal defects is possible, it adds to the complexity of the surgery and increases potential complications. We report the experience of treatment in a case of synovial sarcoma which located at popliteal fossa adjacent to proximal tibia.

• KIEAE Journal
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• v.5 no.3
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• pp.17-24
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• 2005

Until today, rainwater management was processed without disposing the peak discharge, which was due to rainfall, to provide stability against flood damage. In this process, the natural hydrologic cycle changed quickly, and because of this, some problems that could harm human beings and the environment arose. These problems need to be addressed accordingly. One of the proposals was to carry out decentralized rainwater management through a natural hydrologic cycle on site, including utilization, infiltration, detention, and retention of rainwater. This study aims to set the direction of applicable decentralized rainwater management to housing complex in Korea. Therefore, spacial properties in urban housing complexes were analysed such as the impervious area-to-land ratio, the green area-to-land ratio, artificial land-to-land ratio etc. As the result of this study, when a housing complex was small and developed by reconstruction, the impervious area, artificial land, the green area in the artificial land-to-land ratio were high. So, direction of decentralized rainwater management of these housing complexes is available to utilize and detain rainwater. On the other hand, those of big housing complexes in land development district were low relatively. So, direction of decentralized rainwater management of these housing complexes is available to infiltrate and evaporate rainwater.

• Journal of the Korean GEO-environmental Society
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• v.11 no.12
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• pp.37-45
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• 2010

The particle size of microfine cement(MC) is so small that it can be injected into silt layer. But the more particle size is miniaturized, the more the cohesion increases. This phenomenon results in the decrease of the perviousness of MC. In this study, the grouting effects of microfine cement with superplasticizer to maintain cohesion low and that of normal cement were investigated in rock. To estimate the grouting effects, TCR/RQD test for rock quality, lugeon test, borehole loading test for coefficients of elastic and deformative stress, borehole shear test for shear stress, detection p~q~t(pressure~flow~time) chart tests were carried out. The results using MC show a better permeability, modulus of elasticity, deformation, charge per unit, and recover efficiency of grouting material than those of ordinary portland cement except shear stress.