• 펄프종이기술
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• 제32권3호
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• pp.48-56
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• 2000

Yellow dye-stuffs in natural plant were extracted from a gardenia, saffron, safflower, amur tree and pagoda. And then they were used to color Korean handmade paper(Hanji) on using a mordant. The results of the degree of discoloration are as follows. 1. As for a gardenia(Gardenia jasminodes Ellis for. grandiflora Makino), the effects of coloring were outstanding in the acid area. But for the preservation, it might be desirable that used a lye in a dye-stuff obtained at $40{\pm}5^{\circ}C$. 2. As for saffron(Curcuma longa L.), when used alum as a mordant, it was colored to a medium yellow color with green color. But easily discolorated and was not desirable. And, it didn't fit in a dye-stuff of Hanji. 3. For safflower(Carthamus tinctorius L.), when pH was in the low acid it was colored to the cleaner yellow color. It was the distinction of discoloration that the degree of brightness's increase was low. 4. For amur cork-tree(Phellodendron amurense Rupr.), the effects of yellow coloring were great in the areas of acidity and alkali. But, when used alum, the degree of the discoloration was high and was not effective. 5. For pagoda tree(Styphnolobium Japonica L.), using a calcium hydroxide as a mordant, enabled the more than average yellow to be gained. The degree of discoloration was good.

• Advances in aircraft and spacecraft science
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• 제7권1호
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• pp.79-90
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• 2020

The dynamic coupling between shaker and test-article has been investigated by recent research through the so called Virtual Shaker Testing (VST) approach. Basically a VST model includes the mathematical models of the test-item, of the shaker body, of the seismic mass and the facility vibration control algorithm. The subsequent coupled dynamic simulation even if more complex than the classical hard-mounted sine test-prediction, is a closer representation of the reality and is expected to be more accurate. One of the most remarkable benefits of VST is the accurate quantification of the frequency down-shift (with respect to the hard-mounted value), typically affecting the first lateral resonance of heavy test-items, like medium or large size Spacecraft (S/Cs), once mounted on the shaker. In this work, starting from previous successful VST experiences, the parameters having impact on the frequency shift are identified and discussed one by one. A simplified analytical system is thus defined to propose an efficient and effective way of calculating the lower bound frequency shift through a simple equation. Such equation can be useful to correct the S/C lateral natural frequency measured during the test, in order to remove the contribution attributable to the shaker in use. The so-corrected frequency value becomes relevant when verifying the compliance of the S/C w.r.t. the frequency requirement from the Launcher Authority. Moreover, it allows to perform a consistent post-test correlation of the first lateral natural frequency of S/C FE model.

• 자연과학논문집
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• 제8권1호
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• pp.33-39
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• 1995

Klebsiella sp. L-10을 N-methyl-N'-nitro-N''-nitrosoguanidine 과 ethylmethane sulfornate 및 자외선 등으로 돌연변이시켜 히아루론산 복합체의 수율이 친주보다 약 2.5배 증대된 NTG 50 변이주를 얻었다. NTG 50변이주를 이용한 히아루론산 복합체의 최적 생산배지 조성은 효모 추출물 0.1%, 트립톤 3%, 포도당 3%, $K_2HPO_4$ 와 $KH_2PO_4$ 각각 30nM 이었고 배양조건은 배지의 초기 pH 6.0-6.5, 배양온도 $37^{\circ}C$, 24시간의 진탕배양이었으며 이때 배양액 리터당 2900mg의 히아루론산 복합체가 생산되었다.

• 설비공학논문집
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• 제22권8호
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• pp.545-552
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• 2010

Research and development efforts to reduce $CO_2$ emission are in progress to cope with global warming. $CO_2$ emission from fossil fuel fired power plants is a major greenhouse gas source and the post-combustion $CO_2$ capture is considered as a short or medium term option to reduce $CO_2$ emissions. In this study, the application of the post-combustion $CO_2$ capture system, which is based on chemical absorption and stripping processes, to typical fossil fuel fired power plants was investigated. A coal fired plant and a natural gas fired combined cycle plant were selected. Performance of the MEA-based $CO_2$ capture system combined with power plants was analyzed and overall plant performance including the energy consumption of the $CO_2$ capture process was investigated.

• 자연과학논문집
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• 제5권1호
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• pp.47-52
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• 1992

$\beta$-galactosidase를 강력하게 생산하는 호알칼리성, 고온성 세균 TA-11를 부엽토에서 분리하여 Bacillus sp. TA-11로 동정 하였다. Bacillus sp. TA-11에 의한 $\beta$-galactosidase 생산은 lactose 1.5%, peptone과 yeast ext. 각각 0.4%, $MgSO_4$ 0.2%, $NH_4$CL 0.05% 및 NaCl 0.2% 등을 함유한 배지의 pH를 10.0으로 하여 시험균을 접종한후 $50^{\circ}C$에서 2일간 진탕배양 하였을 때 가장 좋았다.

• 자연과학논문집
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• 제7권
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• pp.59-65
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• 1995

토양으로부터 고점성의 히아루론산 복합체를 생산하는 균주를 분리하여 Klebsiella sp.L-10으로 동정하였다. Klebsiella sp. L-10의 히아루론산 복합체 생산 최적 배지 조성은 yeast ext. 0.1%, tryptone 3%, glucose 5%, $K_2HPO_4$와 $KH_2PO_4$ 각각 10mM이었고 배양조건은 배지의 초기 pH6.5, 배양온도 $37^{\circ}C$, 배양시간 18시간 이었으며 이 조건에서 배양액 리터당 약 1,400mg의 점성이 매우 강한 히아루론산 복합체가 생산되었다.

• Journal of Microbiology
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• 제45권3호
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• pp.241-245
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• 2007

This study was conducted to determine the optimal conditions for introduction of exogenous DNA into Synechocystis sp. PCC 6803. Of the three transformation techniques studied, electroporation, ultrasonic transformation and natural transformation, natural transformation showed the highest efficiency. Additionally, this study demonstrated that the higher plasmid concentration and longer homologous recombining fragments resulted in a greater number of transformants. For successful transformation, the lowest concentration of plasmid was $0.02\;{\mu}g/ml$, and the shortest homologous recombining fragment was 0.2 kb. Use of Synechocystis sp. PCC 6803 in the logarithmic growth phase resulted in two-fold higher transformation rate than that of the same organism when cells in the latent phase or the plateau phase were used for transformation. Pretreatment of the host strain, Synechocystis sp. PCC 6803, with EDTA (2 mM) for two days prior to transformation increased the transformation efficiency by 23%. Additionally, incubation of the cells and DNA for 5 h under light conditions increased the transformation efficiency by two orders of magnitude. Moreover, recovery treatment of the cells before they were plated onto antibiotic medium also increased the transformation efficiency.

• 지질공학
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• 제1권1호
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• pp.2-10
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• 1991

이 보문은 리비아의 트리폴리 지역에서 건설공사를 할 경우 지반공학적으로 고려하여야할 점을 기술한 것이다. 지반자료는 이 지역에서 수행된 학교와 주택건설을 위한 부지지반조사에서 얻은 것이다. 자파라 평원의 지표하 10m까지 표층의 대부분은 보통 조밀한 실트질 모래로 구성되어 있다. 그러나 지역적으로는 표토가 빈약하고 석회암이나 석회사암의 호층으로 구성되어 있기도 하며 산지 지역은 대부분 표토의 발달이 거의 없다. 원지반의 실트질 모래는 확대기초나 줄기초를 적용할 경우 일반적으로 150kN/$m^2$의 지내력을 가진다고 추정된다. 트리폴리 지역에서 콘크리트에 적합한 골재의 분포는 매우 제한되어 있으며 조골재는 주로 백운암 석산을 개발하여 공급된다.

• Applied Microscopy
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• 제28권4호
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• pp.527-538
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• 1998

This study was performed to investigate the activity of antibodies in the tissues of Paragonimus westermani at the different developmental stages. Enzyme-linked immunosorbent assay (ELISA) and Immunelectron microscopy (IEM) were applied, using the dog sera infected with metacercariae isolated from Cambaroides similis. These dog sera were obtained from 3rd to 96th week after infection by bleeding. The supernatants of homogenated worms for worm antigen were used. The worm tissues were embedded in Lowicryl HM 20 medium, treated with infected serum and protein A gold complex (particle size; 12 nm) and observed by electron microscope. In the pattern of antibody levels by ELISA test in all developemental worm antigens, the activity of antibody was very weak in the 3rd week, but strong in the worm antibody from 4th to 20th week after infection. Its activity was maintained even till 96th week. The antibody level of the L2th week worm antigen was higher than those of the 20th and 48th week worm antigens. Generally, many gold particles were observed on the secretory granules and the epithelial lamellae. Thus, it was concluded that the antigenic materials in the developmental worm tissues were especially concentrated on the secretory granules in the parenchymal tissues and the epithelial lamellae in the lumen of the caecum.

• 한국의류학회지
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• 제25권8호
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• pp.1408-1419
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• 2001

The purpose of this study was to investigate the fashion trends of last three years and how the trends were imaged by the structural characteristics of the fabrics. The characteristics for 897 fabrics were analyzed from four kinds. eleven volumes of fashion trend magazines. From these magazines, three panels categorized by their frequencies as nine images such as natural, innocent, ethnic, childish, casual, classic, modern and technical, Sub-images of each image such as rustic, irregular, decorative, etc were also categorized. For the each image, fiber contents and structural characteristics of weave type, weight, density, yarn size, twist and fabric finishes were investigated in terms of frequency, range and mean, Results showed that chiffon and organza seemed to have very specific images and used to represent specifically the romantic or ethnic images; whereas voile and jersey was used to represent various images. For S/S seasons, most popular fiber type was cotton. The weave type was not the important factor to give variations in images; plan weave exclusively used irrespective of image. For the romantic, ethnic and innocent images, rather light fabrics were used. For the childish and natural, medium weights, and for the technical, modern and classic images heavy weight fabrics were used. Vaious finishes were employed to represent specific images.