• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.22 no.1
• /
• pp.110-134
• /
• 1977

Effects of phosphorus, potassium and calcium applications on root activity and agronomic characters of paddy rice were studied in submerged paddy soil on which starch was applied to accelerate soil reduction and production of toxic substance during 1971～1973. Root activity at heading date was decreased in reduction accelerated soil by starch application. Effect of calcium application on root activity was differed along soil conditions, phosphorus or potassium levels. Single effects of phosphorus or potassium application were not significant on every observed characters. Calcium application when phosphorus or potassium was not used as basal but used as top dressing increased yield and yield components, especially filled grain ratio. Effect of calcium application along soil conditions was differed on agronomic characters, but calcium application with phosphorus or potassium was more effective to increase yield components and grain yield. Sufficient application of phosphorus, potassium and calcium could improve the nutritional situation of rice plant for panicle development and grain maturity in reduction accelerated paddy soil in which poor growing of rice plant after panicle formation is anticipated by the production of toxic substance from soil.

• Proceedings of the Korean Society of Toxicology Conference
• /
• 1997.05a
• /
• pp.57-60
• /
• 1997

Aloe의 추출 시료들 중 혈관생성을 촉진하는 물질이 G1M1D1M1 분획에 있음을 chorioallantoic-membrane(CAM) assay, in vitro angiogenesis assay, u-PA, PAI, u-PAR, 및 matrix metalloprotease(MMP)의 유전자 발현조사, gelatin zymogram assay, modified CAM assay를 하여 확인 하였다. 그런 다음 G1M1D1M1 분획을 다시 분리하여 단일 성분인 NY932와 3종의 분획들을(U>3,000, 3,000>U>1,000, U<1,000) 얻었다. 이들 각각에 대한 혈관 생성 촉진 작용을 CAM assay 방법으로 조사한 결과 순수단일 성분인NY932가 혈관 생성 촉진 활성을 가장 높게 나타났다. 즉 NY932의 농도를 100ng, 2, 10, 35, 60 $\mu$g으로 투여하였을 때, 각각 2/18($11\%$), 4/10($49\%$), 16/22($73\%$), 15/17($88\%$), 9/9($100\%$)의 혈관생성 촉진 효과를 보였다. 따라서 순수 단일 성분인 NY932의 혈관 생성 촉진 작용기전을 규명하기 위하여 혈관 생성에 관련된 효소들[matrix metalloprotease(MMP)s, urokinase-plasminogen activator(uPA) 등]과 그 저해제들(TIMPs, PAI)의 유전자 발현을 조사하였으며, wounding migration assay등을 수행하였다.

• Journal of the Korean GEO-environmental Society
• /
• v.13 no.5
• /
• pp.13-24
• /
• 2012

In this study, the in-situ model test has been conducted and used to estimate and analyze consolidation behavior of the ground by using the miniature test that reconstructs economically geotechnical behavior of in-situ full scale structure. To analogize the relation among effective stress, void ratio and coefficient of permeability at the self-weight consolidation stage, the low stress seepage consolidation test has been conducted and the involution function of constitutive equation had been obtained from the result of the curve fitted seepage consolidation test result. As a result of the numerical analysis that had been conducted on the representative section using a constitute equation, final settlement was similar with those of self-weight consolidation of the centrifugal model test. But, it was more or less smaller. It seems that these trends are caused by the difference between estimated values.

• Journal of Korea Fair Competition Federation
• /
• no.80
• /
• pp.14-19
• /
• 2002

가격상한제가 효율적으로 시행될 경우 통신사업의 생산성 향상, 신규서비스 도입촉진 등으로 보수율 규제방식에 비하여 사회후생에 긍정적 효과가 기대된다. 즉 가격상한제는 규제대상의 사업자에게 제한된 범위내에서 요금설정의 자율성을 부여함으로써, 생산성 향상의 결과를 사업자가 일부 향유할 수 있어 원가절감의 유인을 제공할 수 있다. 또한 기술발전에 따른 신규서비스 도입과 수요행태에 부응하는 다양한 요금제도의 도입을 촉진할 수도 있다. 따라서 명시적인 규제기준과 합리적인 운용절차가 설정될 경우 경쟁활성화, 요금규제의 투명성 확보 및 공정경쟁 강화 등의 효과를 기대할 수 있다.

• Journal of Sericultural and Entomological Science
• /
• v.37 no.2
• /
• pp.127-131
• /
• 1995

A crude crystal of phytoecdysone was obtained 355 mg per Kg dry radix of A. japonica, and it was identified to $\beta$-ecdysone by TLC. Feeding silkworms on mulberry leaves sprayed with the extract, mounting time shortened and pupation ratio improved. The feeding effects of the extract was differed according to the rearing seasons, spring and summer. In spring season, only mounting time shortened without any difference in pupation ratio from the control. In summer season, not only mounting time shortened, but also pupation ratio remarkably advanced.

• Journal of the Korean Geosynthetics Society
• /
• v.8 no.4
• /
• pp.35-40
• /
• 2009

In this paper, a series of laboratory chamber tests was carried out to evaluate promoting consolidation of a porous concrete pile fabricated with recycled aggregates (RAPP) method for soft ground improvement. Performing the laboratory chamber tests for the RAPP, characteristics of the surface settlement with time and the consolidation time were compared with those of SCP and GCP provided by You (2009) under the same experimental condition. In addition, the experimental results were compared with the numerical analysis in this study. As a test result, the effects for settlement reduction in both the primary and the secondary consolidation and promoting consolidation by RAPP were prominent comparatively.

• Journal of the Korean Geosynthetics Society
• /
• v.8 no.2
• /
• pp.41-46
• /
• 2009

In this paper, a series of model tests were performed in laboratory to evaluate promoting consolidation of compaction pile methods for soft ground improvement. For the model tests, composite soil samples that have 10% replacement area ratio were prepared by using sand, gravel, and sandy gravel for the materials of compaction piles. After loading to each composite soil sample, the excess pore pressure dissipation and settlement were investigated. In addition, the behavior of clay mixed with each compaction pile was also monitored at the end of consolidation to evaluate clogging phenomenon. As a test result, the effects for decreasing settlement and promoting consolidation by GCP were prominent, and the mixed clay was not monitored in all of the three compaction piles.

• Korean Journal of Food Science and Technology
• /
• v.22 no.1
• /
• pp.7-12
• /
• 1990

The effect of $Fe^{2+}$ and myoglobin on the oxidative stability of triglyceride molecular species was investigated at $25^{\circ}C$. The molecular species of soybean oil triglycerides were analyzed by capillary column gas chromatography and electron impact ionization mass spectrometry utilizing selected ion monitoring. When $Fe^{2+}$ and myoglobin were added to soybean oil triglycerides, the oxidative stability of each molecular species of triglycerides appeared to decrease in proportion to the increase in the number of double bonds present in the acyl residues, and it was affected by degree of unsaturation of fatty acid when the total degree of unsaturation of triglyceride was the same. But the length of the saturated acyl chain had no influence on the stabilization of unsaturated fatty acid present in the same glyceride when prooxidants were added.

• Korean Journal of Environmental Agriculture
• /
• v.19 no.4
• /
• pp.284-293
• /
• 2000

For the artificial removal of air pollutants such as pesticides, environmental toxicants, and pathogenic microorganisms in the greenhouse or the living environment, the accelerated photodegradation and the biocidal effects of some photosensitizers (PS)/photocatalysts (PC) were tested under the sunlight and/or artificial light. The selected photosensitizers/photocatalysts included the semiconductors (PC-1 and PC-2), the oxidizers (PC-3, PC-4, PC-5 and PC-6), the aromatic ketone (PS-7) and the aromatic amine (PS-8). In the case of dichlorvos, all the photocatalysts selected showed more accelerated photodegradation than the control without photocatalysts under both the sunlight and artificial light. Whereas, only the photocatalyst PC-1 accelerated the degradation of methyl tert-butyl ether about 17 times more than the control under both the sunlight and artificial light. Procymidone was much more degraded by the photosensitizer PS-8 and the two photocatalysts (PC-1, PC-6) than by PS-7. In the preliminary experiments to diminish the population of the microorganisms in the air, the photocatalyst PC-1 added to the suspensions of Pseudomonas putida, Phytophthora capsici, and Salmonella typhimurium obviously inhibited the microbial growth under the artificial light. The photocatalyst PC-1 showed a bactericidal activity against Salmonella typhimurium spread on the nutrient broth agar medium. These results suggest that the photosensitizers/photocatalysis under the light can remove some air pollutants and hence they can be used to reduce the exposure of the workers in the horticultural facilities and/or the public in the environment to the harmful pollutants.

• The Korean Journal of Pesticide Science
• /
• v.4 no.4
• /
• pp.12-18
• /
• 2000

In order to artificially reduce the quinclorac residue in aqueous solution and soil, six potential photosensitizers were screened for their effectiveness in enhancing the photodegradation. The degraded amount of quinclorac in distilled water by sunlight was minor compared to that in the dark, indicating that there was little direct photolysis. The photodegradation ratio of quinclorac in methanol was 40.3%. Whereas, the ratios in the presence of photosensitizers PS-1 (aromatic ketone), PS-3 (polycyclic quinone), and PS-6 (inorganic semiconductor) were 96.6, 72.7, and 95.7%, respectively, showing the most photosensitizing effects. In sand, PS-3 was more effective than any other photosensitizer PS-1 (19.6%), PS-3 (64.1%) and PS-6 ($17.9{\sim}19.4%$). five photoproducts of quinclorac in methanol were identified by GC-MS and quinclorac added with the photosensitizer PS-1 gave three photoproducts. Photoproducts with an aldehyde group formed in methanol were confirmed by the reduction of sodium 3,5-dinitrosalicylate in the Lindsay's method. E. crus-galli war. oryzicola was not controlled by the quinclorac residues photodegraded at tile concentrations higher than 30 ppm of the photosensitizer PS-3 in a flooded rice paddy soil. These results indicate that the quinclorac residues in aqueous solution and soil can be degraded efficiently by tile photosensitizers PS-1, PS-3, and PS-6.