• Journal of Nutrition and Health
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• v.18 no.2
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• pp.126-138
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• 1985

A study was made on the effect of anti-nutritional factors found in some Korean beans : soybean, red bead, mung bean and kidney bean. Two animal experiments were conducted to investigate the nutritional value of the beans. The first experiment, in which the diet contained 15% protein from raw beans, compared the intensity of inhibition caused by methionine deficiency or a total amino acid deficiency. In the second experiment, the conditions were the same as in experiment I, except that heated beans were substituted for raw beans. Severe growth inhibition and high mortality was found in the raw kidney bean and red bean groups than in the soybean and mung bean groups. As no effect on the growth inhibition of raw bean groups was shown by methionine and protein supplementation, the inhibition could be ascribed mainly to the low feed intake and the low protein digestibility caused by toxic factors. Pancreatic enlargement was obserbed in all the raw bean groups. A increase in body weight, a decrease in mortality and a decrease in the weight pancreases were found in the heated bean groups. But the digestility of the diet and of the protein and the PER by heating did not increase as markedly as weight, except in the heated red bean groups. Even with heat treatment, the whole inhibitory action could not be eliminated.

• Journal of the Korean Society of Food Science and Nutrition
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• v.36 no.7
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• pp.832-839
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• 2007

This study was conducted to investigate the bioavailability of starfish calcium with substances enhancing calcium absorption. Three week-old young female rats (Sprague-Barley) were divided into 5 groups according to calcium sources and testing agents; calcium carbonate (C), starfish calcium (S), starfish calcium + casein phosphopeptide (S-CPP), starfish calcium+citrate-malate (S-CM), starfish calcium+isoflavone (S-ISO), and were fed experimental diets containing AIN-93G based Ca (0.35% w/w) diet with CPP, CM and ISO for 6 weeks. Blood, femur, urine and feces samples were collected. There was no significant difference among groups in terms of growth and food intake. Serum Ca concentrations were normal in all 5 groups. Serum P concentrations and ALP activities were not significantly different among groups. Ca absorption and retention were significantly increased both in S-CPP and S-CM groups compared to C group (p<0.05). p absorption was significantly higher in S-CPP group than in other groups. While the amount of soluble Ca of intestinal contents did not differ among groups, the amount of insoluble Ca was significantly lower in S-CPP, S-CM and S-ISO groups than in C and S groups. However, the weight, Ca and P concentrations of femur were not significantly different among groups. These results suggest that the addition of CPP and citrate-malate were more effective for enhancing the bioavailability, intestinal absorption and solubility of starfish calcium.

• Journal of Korean Society of Environmental Engineers
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• v.32 no.2
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• pp.141-148
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• 2010

Feasibility of floating aquatic plants (Eichhornia crassipes and Water dropwort) was investigated in order to control of sewage depending on various initial loading in a lab scale test. In addition, field test was conducted to assess the uptake rate of nutrient by E. crassipes. Lab-scale test applying primary domestic effluent operated at 4 day HRT shows that the highest uptake rates were 1.06 g N/$m^2{\cdot}day$ and 0.39 g P/$m^2{\cdot}day$ in the E. crassipes reactor. BOD removal efficiency in E. crassipes reactor was as high as 80% when the loading value was lower than 185 kg BOD/$ha{\cdot}day$. While 70 ~ 80% removal efficiency of BOD was achieved when the loading value was lower 80 kg BOD/$ha{\cdot}day$ at the W. Dropwort reactor. Experiment results show that E.crassipes has a higher nutrients removal efficiency than W. dropwort under high pollutant loading. Input loadings of TN and TP should not exceed to 10 kg TN/$ha{\cdot}day$ and 2.0 kg TP/$ha{\cdot}day$ respectively to provide a 50% TN and 80% TP removal efficiencies using E. crassipes. The field test demonstrated that an annual yield of E. crassipes mass was estimated as a fresh weight of 30.9 $m^3/ha{\cdot}yr$. E. crassipes grown in field pads absorbed 76.7 kg N/$ha{\cdot}yr$ and 13.4 kg P/$ha{\cdot}yr$ as a dry weight.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.12
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• pp.1311-1320
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• 2003

This paper proposed the estimating method of electromagnetic dosimetric reliability at in-vivo and in-vitro experiments. For more accurate consequences of these researches, we have tried to find out any correlations among output power, power density and specific absorption rate(SAR) with the results of in-vivo, in-vitro tests and SAR reports of cellular phone and PDA. In the case of in-vivo tests, the power density has close statistical correlations with SAR value and in the event of in-vitro tests, the output power has considerable statistical correlations with SAR containing duty factor. We analysed the coefficient of determination to estimate the dosimeoic uncertainty. If we use this method before evaluating techniques of measurement and analysis at both in-vivo and in-vitro experiments, we will conduct more accurate reliability test.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.21 no.2
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• pp.82-86
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• 2011

Lightweight aggregate which is composed of sintered polycrystalline materials usually has a certain portion of pores inside of it. Because of such a structural characteristics, it tends to that movement of water in aggregate shows an abnormal behavior against the change of outside environment. In general, water movement behavior is controlled by porosity, distribution of pore size; however, dense surface layer will also affect water movement behavior in case of artificially sintered aggregates. Factors affecting water movement behavior in the aggregate are pore distribution, pore shape, pre-wetting method, etc. In this study, absorption characteristics of aggregate under the pressure and absorption rate according to water dipping time are analyzed for the basis of pressure pumping of lightweight concrete. Two kinds of aggregates were used for the test: one is made by 'L' company in Germany and the other is of our own made at the pilot plant in Kyonggi University. Absorption rate of aggregate is measured according to water dipping time, vacuum pressure, and quenching condition. Absorption rate of aggregate with $300^{\circ}C$ quenching is higher than that of aggregate with 24 hr water dipping. Generally the more vacuum the higher water absorption rate. Water absorption rate of 'L' aggregate under -300 mmHg is 54 % higher than that of aggregate with 24 hr water dipping; however, only 2 % increase in water absorption was measured for the K622 and K73 which were of our own.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.609-612
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• 2008

This study investigated effect of recycled fine aggregate quality on strength properties of concrete. Some investigations have been carried out to study the strength properties of recycled aggregate concrete. But these have some limitation due to small-scale test in the laboratory. Therefore concrete using this study were fabricated by ready-mix concrete. Variables were quality of recycled fine aggregate(high and low quality) and replacement ratio of 0%, 30%, 60%, 100%(high quality), 35, 70%(low quality). The change of air content of recycled aggregate concrete were similar to natural aggregate concrete. Replacement ratio of recycled aggregate was not necessarily correlated with compressive strength and modulus of rupture of recycled aggregate concrete.

• Journal of the Korea Institute of Building Construction
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• v.22 no.3
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• pp.229-237
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• 2022

Ultra High Performance Concrete(UHPC) is a construction material that has a low water-binder ratio (W/B), a high-performance chemical admixture(SP), mixing material and steel fiber, and performance superior to that of regular concrete in terms of liquidity and strength. In the study, UHPC was used to prepare construction external panels that can replace existing stone panels. In addition, experiments were conducted to access the effects of differences in chemical admixture input amount, the number of fillers, antifoaming agent and steel fiber. An evaluation, was conducted, such of concrete compressive strength, flexural strength, impact strength, absorption rate, and frost resistance. The results showed compressive strength up to 115.5MPa, flexural strength of 20.3MPa, and an absorption rate of 1%. In this case, impact strength and frost resistance evaluation were satisfied with outward observed.

• Culinary science and hospitality research
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• v.7 no.3
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• pp.179-191
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• 2001

The effects of whole wheat flour on the Rheological Properties of dough gassing power of yeast S.cerevisiae and breadmaking properties were studied. The blending ratios of whole wheat flour to bread making flour were 0, 25, 50, 75 and water absorption in the farinography increasedlinerly from 62.5%in 100% bread making flour and 77.5% in 100% whole wheat flour. The hardness and cohesiveness of dough prepared with optimum moisture content was constant regardless of the blending ratio of whole wheat flour. whole wheat flour had no effect on the total gas production or the internal gas content in the dough at a constant moisture level but had detrimental effect on the loaf volume. In a dough at the optimum moisture level, whole wheat flour increased the two former parameters sensory evaluation indicated that the replacement in the range of 25 to 50% with whole wheat flour at the optimum moisture level was acceptable

• Journal of the Korea institute for structural maintenance and inspection
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• v.19 no.1
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• pp.35-44
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• 2015

Two main parameters were examined such as CSA content and polymer-binder ratio to find effects on the strength, water absorption, chloride ion penetration depth, carbonation depth, length change and chemical resistance of polymer-modified mortar with CSA and EVA polymer powder (EVAPP). As results, compressive, flexural, tensile, adhesive strengths, and length change of the polymer-modified mortar with CSA and EVAPP increases with increasing CSA content and polymer-binder ratio, although the water absorption, chloride ion penetration depth, and carbonation depth decrease with increasing polymer-binder ratio and CSA content, and also the chemical resistance decreases. Such strength and durability development is attributed to the high tensile strength of EVA polymer and the improved bond between cement hydrates and aggregates because of the addition of EVAPP and CSA.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.126-126
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• 2011

수직으로 정렬된 1차원 ZnO nanorod arrays (NRAs)는 효율적인 반사방지 특성의 기하학적 구조를 갖고 있어, 크기와 모양 그리고 정렬형태의 다양한 설계를 통해 빛의 흡수율과 광 추출효율을 증가시켜 광전소자 및 태양광 소자의 성능을 향상시킬 수 있으며, 최근 이러한 연구에 대한 관심이 집중되고 있다. 본 연구에서는 ZnO NRAs의 넓은 표면적과 불연속적인 독특한 표면을 활용하여 광학적 특성을 효과적으로 개선하였다. 실험을 위해, thermal evaporator를 사용하여 Au와 Ag 그리고 e-beam evaporator를 사용하여 $SiO_2$를 ZnO NRAs 표면에 여러 가지 조건으로 증착하여, 독특한 계층 나노구조의 형성과 광학적 특성을 관찰하였다. 표면 roughness가 큰 FTO/glass 위에 수열합성법을 통해 끝이 뾰족하고, 비스듬히 정렬된 ZnO nano-tip array에 Au를 증착할 경우 ZnO/Au core/shell 구조가 형성되며, Au의 광 흡수율이 매우 크게 증가함을 관찰할 수 있었다. 반면 flat한 표면위에 빽빽하게 수직으로 정렬된 ZnO NRAs를 성장시켜 그 위에 Ag를 증착할 경우, evaporated Ag flux가 ZnO nanorod의 사이에 scattered 되어 ZnO nanorod 기둥의 측면에 직경이 50 nm 이하인 nanoparticles이 decorated 되어 국소표면플라즈몬 현상이 관찰되었으며, 이러한 효과를 통해 입사되는 빛의 흡수율을 효과적으로 증가시킬 수 있었다. 또한, ZnO NRAs의 표면에 $SiO_2$를 e-beam evaporator를 이용하여 증착할 경우, 자연적으로 vapor flux와 ZnO nanorod 사이에 oblique angle이 $80^{\circ}$ 이상으로 증가하여 $SiO_2$ nanorods가 자발적으로 형성되어 ZnO/$SiO_2$ branch 계층형태의 나노구조를 제작할 수 있었다. 이러한 구조는 유효 graded refractive index profile로 인해 기존의 ZnO NRAs보다 개선된 반사방지 특성을 나타냈다. 이러한 계층 나노구조의 광학적 특성을 시뮬레이션을 통해 이론적으로 분석을 통해 광전자 소자의 성능의 개선에 대한 적용 가능성을 조사하였다.