• Nuclear Engineering and Technology
• /
• 제53권10호
• /
• pp.3367-3378
• /
• 2021

The design phase and safety assessment of Generation IV liquid metal-cooled fast reactors calls for the improvement of fuel pin performance codes, in particular the enhancement of their predictive capabilities towards uranium-plutonium mixed oxide fuels and stainless-steel cladding under irradiation in fast reactor environments. To this end, the current capabilities of fuel performance codes must be critically assessed against experimental data from available irradiation experiments. This work is devoted to the assessment of three European fuel performance codes, namely GERMINAL, MACROS and TRANSURANUS, against the irradiation of two fuel pins selected from the SUPERFACT-1 experimental campaign. The pins are characterized by a low enrichment (~ 2 wt.%) of minor actinides (neptunium and americium) in the fuel, and by plutonium content and cladding material in line with design choices envisaged for liquid metal-cooled Generation IV reactor fuels. The predictions of the codes are compared to several experimental measurements, allowing the identification of the current code capabilities in predicting fuel restructuring, cladding deformation, redistribution of actinides and volatile fission products. The integral assessment against experimental data is complemented by a code-to-code benchmark focused on the evolution of quantities of engineering interest over time. The benchmark analysis points out the differences in the code predictions of fuel central temperature, fuel-cladding gap width, cladding outer radius, pin internal pressure and fission gas release and suggests potential modelling development paths towards an improved description of the fuel pin behaviour in fast reactor irradiation conditions.

• 한국미생물·생명공학회지
• /
• 제49권1호
• /
• pp.88-94
• /
• 2021

해조류 중 홍조류인 꼬시래기(G. verrucosa)로부터 효모를 이용한 발효를 위해 열산가수분해, 효소당화 및 에탄올 발효수율 향상을 검토하고, 기존의 혼합당의 흡수효율을 높이기 위해 고농도 당 순치를 수행하였다. 열산가수분해는 200 mM 황산(H₂SO₄)을 이용하여 10% (w/v)의 꼬시래기(G. verrucosa)의 슬러리, 130℃의 온도에서 60분 동안 열산가수분해를 수행하였다. 또한 wild type 효모와 고농도 galactose에 순치(adaptive evolution)된 효모를 이용한 발효를 실시한 결과, wild type 효모의 경우 발효 144시간에 8.5 g/l 에탄올 발효로 에탄올수율계수 Y_EtOH = 0.19와 galactose에 순치된 효모의 경우 21.5 g/l 에탄올 발효로 에탄올수율계수 Y_EtOH = 0.50을 나타내었다. 이러한 연구결과는 해양 바이오매스인 해조류로부터 바이오 연료의 효율적인 생산방법을 제공할 수 있을 것으로 판단된다.

• 천문학회보
• /
• 제40권1호
• /
• pp.45.2-45.2
• /
• 2015

우리는 최근 현대천문학의 가장 오래된 난제로 우리은하 헤일로의 형성과 깊은 관련이 있는 구상성단계의 오스터호프 이분법이 다중항성종족 패러다임 하에서 76년 만에 완벽히 규명되는 것을 발견하였다. 또한 이 연구의 기본 개념을 우리은하 벌지에 적용한 결과, 기존 국제학계의 이론과 완전히 다른 벌지의 형성기원에 대한 새로운 해석에 도달하였다. 우리은하의 벌지에 대한 대규모 측광 서베이 분석으로부터 double red clumps가 있다는 것이 2010년에 발견되었고, 이는 디스크와 바 불안정에 기인하는 은하중심부 X-shape 구조의 증거로 널리 받아들여지고 있다. 그러나 우리는 이와 같은 국제학계의 해석이 수평계열성의 항성진화이론을 간과한데서 비롯된 허구일 가능성을 제시하고자 한다. 우리의 모델에 의하면 관측된 double red clumps는 Omega Cen을 포함하는 대다수의 구상성단에서 발견되는 것과 동일한 헬륨함량이 증가된 2세대 별들(G2)에 의한 효과이다. 우리은하 벌지에 위치한 Terzan 5 구상성단처럼, 중원소함량이 높은 벌지에서는 G2에 해당하는 수평계열성들이 광도가 약 0.5등급 더 밝은 red clump 위치에 놓이게 되어 자연스럽게 double red clumps를 형성하게 된다. 앞으로 우리의 새로운 해석이 Gaia에 의한 삼각시차 거리결정으로 확인된다면, 이는 우리은하 벌지를 이루는 대부분의 별들이 Terzan 5와 같은 윈시 빌딩블럭들의 합병과 붕괴에 의해 형성되었다는 것을 암시하여, 우리은하는 물론, 조기형은하의 형성기원 연구에 큰 전환점이 될 것으로 기대한다.

• 생명과학회지
• /
• 제12권4호
• /
• pp.427-432
• /
• 2002

잇바디돌김(Porptyra dentata)을 대상으로 핵의 18S ribo-somal RNA를 지령하는 유전자 즉 18S rDNA 유전자를 증폭하고, 염기서열분석을 수행하였다. 전체 18S rDNA의 exon 영역 크기는 1822 bp, intron 영역의 크기는 512 bp였다. 이들 exon과 intron 영역의 G+C함량은 각각 49%와 55%씩 나타내었다. 일본산 잇바디돌김(CenBank accession number: AB013183)의 exon 영역과의 비교에서 상동성이 97.1%에 도달하였다. 568번과 569번 염기사이의 upstream에 위치하는 intron 영 역에서는 AB013183과 52.1%의 상동성을 보였다.

• 복식
• /
• 제30권
• /
• pp.139-152
• /
• 1996

THe purpose of this study is to clarify Kitsch in the modern society and to analyze the modern fahion design adapting Kitsch's materiality. Thus this study explains the concepts and background of kitsch and examines its aes-thetic value in consideration of the relation be-tween Kitsch and plastic art. Through a theoretical examination of histori-cal documents the meaning of the Kitsch is explored from various angles. The result of this study were as follows: Kitsch began in the period of the 19th cen-tury when was society began to form and so-ciety grew to be rich. This is to say Kitsch is the result of intrusion of capitalist modernity in the domain of the aesthetic modernity The concept meant ethical something bad counterfeit and bad taste. The materialities of Kitsch are over-decor-ation unfitness the use of imitation malfunc-tion used fashion design. 1. Over-decoration is due to the material abundnce through various accessories many colors etc. 2. Unfitness is obtained by the error of ar-rangement which means the wrong cohesion of form size of material. 3. The use of imitation makes use of cheap materals such as vinyl imitation leather imi-tation fur etc. 4. Malfunction comes from losing the orig-inal function by the addition of un-neccessary functions.

• Biotechnology and Bioprocess Engineering:BBE
• /
• 제10권3호
• /
• pp.236-241
• /
• 2005

A decolorization process using ion exchange chromatography was developed to refine rhEGF as a cosmetic ingredient. A macroreticular resin (D314) was selected, with respect to its high decolorization rate and recovery yield of rhEGF, and the operational conditions of the decolorization process optimized. The optimum conditions were as follows: the rhEGF effluent was ion exchanged at a flow rate of 60.0mL/h, with an effluent pH 5.0, using a chromatographic column (i.d. 16mm) packed with D314, with a 7.5cm in bed height. The decolorization process was carried out under the optimum conditions, and halted when the effluent volume reached 350mL, giving a decolorization rate and recovery yield of rhEGF higher than 67 and $80\%$, respectively. When the decolorization rate exceeded $67\%$, the final product turned out to be white or light yellowish, which was to the satisfaction of the cosmetic standard.

• 복식
• /
• 제28권
• /
• pp.47-64
• /
• 1996

This paper is a study on the expression of Clothing and Textiles recorded in $\ulcorner Makuranosorsi(枕草子) \lrcorner$ This book was written by a Japanese servant in the Royal Court about the year 10000. In this book many kinds of clothing ornament color and materials were mentioned. The discoveries of this paper were as follows. 1. There were 85 different kinds of name In detail there were 46 Clothing and Accessories 32 Clors 11 Materials Patterns the method of Dyeing. 2. All the Clothing and Textiles in Makur-anosorsi were reflections of the reality of that times. 3. From ancient times japanse Costume was much influenced by Korea. but around the 7th century the influence increased. 4. Almost all clothing and Accessories used in Japan in the 10th century had been pre-viosly used in neighboring countries Korea and China But after they were imported to japan some of them were changed to japans hybrids especially in name and shape. 5. In Japan Clothing Colors were used in various ways sometimes colors coordinated by over lapping dress and othertimes the colors were weaved together Namely the width and length of these colorful fibres are also signifi-cant meaning. This meas that the Japanese was much more interested in color than other countries and this also proves Clothing Colors were very developed in japan by the 10th cen-tury. 6. The Materials discovered in this book were almost all silk This is the reason why $\ulcorner Makuranosorsi \lrcorner$ was the expression of the Royal Court.

• 천문학논총
• /
• 제15권spc1호
• /
• pp.15-30
• /
• 2000

A large scatter of the chemical abundances among globular cluster red giants has been observed. Especially the chemical elements C, N, O, Na, Mg, and Al vary form star to star within globular clusters. Except for $\omega$ Cen and M22, most globular clusters could be considered to be monometallic of their iron peak elements within error ranges. The variations in light elements among globuar cluster giants appear much more pronounced than in field halo giants of comparable Fe-peak metallicity. It has been found that in general the nitrogen abundance is anticorrelated with both carbon and oxygen, while it is correlated with Na and AI. These intracluster abundance inhomogeneities can be interpreted either by mixing of nucleosythesized material from the deep stellar interior during the red giant branch phase of evolution or by inhomogeneities of primordially processed material, from which the stars were formed. The simple way of distingushing between two senarios is to obtain the element abundances of main-sequence stars in globular clusters, which are too faint for high resolution spectroscopic studies until now. Both 'evolutionary' and 'primodial' origins are accepted for explanations of abundance variations among red giants and CN-CH anticorrelations among main-sequence stars in globular clusters. This paper reviews chemical abundances of light elements among globular cluster giants, with brief reviews of cannonical stellar evolution of low mass stars after main-sequence and deep mixing for abundance variations of cluster giants, and a possible connection between deep mixing and second parameter.

• Carbon letters
• /
• 제15권3호
• /
• pp.198-202
• /
• 2014

Amorphous agglomerates of carbon nanospheres (CNS) with a diameter range of 10-50 nm were synthesized using the solution combustion method. High-resolution transmission electron microscopy (HRTEM) revealed a densely packed high surface area of $SP^2$-hybridized carbon; however, there were no crystalline structural components, as can be seen from the scanning electron microscopy, HRTEM, X-ray diffraction, Raman spectroscopy, and thermal gravimetric analyses. Electrochemical and thermo catalytic decomposition study results show that the material can be used as a potential electrode candidate for the fabrication of energy storage devices and also for the production of free hydrogen if such devices are used in a fluidized bed reactor loaded with the as-prepared CNS as the catalyst bed.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 1988년도 가을 학술발표회 논문집
• /
• pp.24-29
• /
• 1988

In this paper, it is proposed hew the rigid element method suggested in the first paper can be applied to the elastic and elasto-plastic analysis of spherical shell with the open stiff ring. In the analytical model, the solution domain is divided into rectangular-shaped spherical bending elements. Each contact surface of two adjacent elements is interconnected with four elastic springs, and it is assumed that the internal forces are distritributed into springs. The 6 degrees of freedom of the element are placed in the center of elements, and the 6 cen-teroidal rigid displacements affect other elements through springs around elements. And then the solution domain is estimated by the behavior of elements and springs. In this study, these concepts are applied to the elastic and elasto-plastic analysis for the eight cases of the spherical shell according to the condition of stiff ring, the condion of loading and the size of opening. And then some numerical results such as the distribution of stresses, the force-displacement curves and the mode of fractures will he shown.