• Nuclear Engineering and Technology
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• v.26 no.4
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• pp.484-492
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• 1994

Microstructures of Nb$_2$O$_{5}$-doped UO$_2$ pellets have been investigated during sintering under H$_2$ and $CO_2$ atmospheres. Pellets are sintered at 1$700^{\circ}C$ in H$_2$ atmosphere and at 130$0^{\circ}C$ in $CO_2$ atmosphere for 1 to 41 hr. The addison of Nb$_2$O$_{5}$ causes the formation of large pores, which shrink to some extent in H$_2$ atmosphere but very little in $CO_2$. Fine pores in the Nb$_2$O$_{5}$-doped UO$_2$ pellet are almost annihilated when sintered under H$_2$ atmosphere but little changed under $CO_2$ atmosphere. The increase in grain size due to Nb$_2$O$_{5}$ addition is much larger in H$_2$ atmosphere than in $CO_2$. Thus the enhancement of uranium diffusion in UO$_2$ due to the Nb$_2$O$_{5}$ addition is thought to be more significant in H$_2$ atmosphere. Microstructures of Nb$_2$O$_{5}$-doped UO$_2$ pellets sintered in H$_2$ atmosphere are discussed from the viewpoint of in-reactor performance. Possible defects formation due to Nb$_2$O$_{5}$ addition is discussed to explain the enhancement of uranium diffusion in H$_2$ and $CO_2$ atmospheres.> atmospheres.

• Journal of Service Research and Studies
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• v.12 no.1
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• pp.1-24
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• 2022

This study was conducted to derive a new model for popular democracy in the modern society. The problem is exacerbated as the original model of democracy, isonomia, has faded and modern democracy is operated as a democracy in which the masses rule. Democracy is exposing a bigger problem due to the economic inequality caused by the majority rule and the capitalist economic system. Popular democracy, in which all the masses are equally qualified as sovereigns, is a structure in which cunning politicians can easily seize power if the voters are not wise. Isonomia is a system in which free people who solve economic problems on their own and have honesty, courage, dedication, sacrifice and sincerity set laws with the same qualifications, and keep the laws themselves, is a system that depends heavily on the conscience and virtue of free people. Modern popular democracy embodies the absolute equality of the sovereign regardless of economic power, but without the spirit of sacrifice and dedication to the community, those who can win popularity by wrapping themselves up as if they are sacrificial and capable people may seize power. This study presents a service-oriented democracy as a system that can maintain the merits of modern popular democracy while embodying the essence of isonomia. The system was implemented focusing on the qualifications for virtue, such as honesty, courage, sacrifice, integrity, etc., fair to all regardless of wealth. Human imperfections have been supplemented by the use of artificial intelligence. The assumption about the nature of the sovereign and public officials' agents was newly established, and the winner-take-allism problem was solved. This study proved that both the philosophy of Isonomia and the merits of Democracy can be realized through service-oriented democracy based on the common principle of humanity and the philosophy of service. Service-oriented democracy can be called revision democracy.

• Journal of Service Research and Studies
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• v.12 no.1
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• pp.49-68
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• 2022

This study was conducted to design a financial system for the sustainable life of mankind. Human society faces a constant crisis and leads a life while overcoming it. The polarization is intensifying in the process of overcoming the economic crisis or crisis caused by the virus. In a society adopting the capitalist economic system, it is a common phenomenon that polarization intensifies with the passage of time, but since the intensification of polarization can destroy human society as a community, active countermeasures are required. The purpose of this study was to prevent the deepening of polarization by redesigning important financial-related systems from the perspective of human life and maintenance of human society. Through the history of mankind, monetary and financial systems related to sustainable society have been analyzed, and a financial system model that is ideal for the modern and future society and is sustainable in the long term has been derived. The conditions for a long-term sustainable financial system should be a model that can solve the problems of the current system, such as deepening polarization, and a model that is faithful to the characteristics of the modern economic society and the essence of sustainable life. And it can be sustainable only if it is based on the common principles of human society. It should be a model that guarantees core values such as growth and equality that human society demands. After analyzing the problems of the current economic system and analyzing the conditions required for the new system, the basic axioms that the new financial system should be based on were presented, and a desirable model was derived based on this. The structure of the derived model and the specific operation model were presented. In the future, follow-up studies are needed to concrete this model.

• Journal of the Microelectronics and Packaging Society
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• v.31 no.1
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• pp.43-48
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• 2024

The discovery of a two-dimensional electron gas (2DEG) at the interface of LaAlO₃ (LAO) and SrTiO₃ (STO) substrates has sparked significant interest, providing a foundation for cutting-edge research in electronic devices based on complex oxide heterostructures. However, conventional methods for producing LAO thin films, typically employing techniques like pulsed laser deposition (PLD) within physical vapor deposition (PVD), are associated with high costs and challenges in precisely controlling the La and Al composition within LAO. In this study, we adopted a cost-effective alternative approach-solution-based processing-to fabricate LAO thin films and investigated their electrical properties. By adjusting the concentration of the precursor solution, we varied the thickness of LAO films from 2 to 65 nm and determined the sheet resistance and carrier density for each thickness. After vacuum annealing, the sheet resistance of the conductive channel ranged from 0.015 to 0.020 Ω·s^-1, indicating that electron conduction occurs not only at the LAO/STO interface but also into the STO bulk region, consistent with previous studies. These findings demonstrate the successful formation and control of 2DEG through solution-based processing, offering the potential to reduce process costs and broaden the scope of applications in electronic device manufacturing.

• Economic and Environmental Geology
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• v.57 no.4
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• pp.449-471
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• 2024

We investigated the radiometric ages and petrological characteristics of basaltic rocks with columnar joints, basalt gorge, pillow lava, and mantle xenolith, from the geoheritages designated as Natural Monuments of Korea in recognition of their historical, academic, and scenic excellence. A total of 7 Natural Monuments were selected. They are 'Basalt gorge along Daegyocheon Stream of Hantangang River', 'Basalt gorge and Bidulginangpokpo Falls of Hantangang River, Pocheon', 'Pillow lava in Auraji, Pocheon' distributed along the Chugaryeong Fault System, 'Peridotite xenolith-bearing basalt in Jinchon-ri Baengnyeongdo Island, Ongjin', 'Columnar joint in Daljeon-ri, Pohang', 'Columnar joint in Yangnam, Gyeongju', and 'Columnar joint along Jungmun and Daepo Coasts, Jeju'. They ranged in age from the Cenozoic Neogene Miocene to the Quarternary Pleistocene. Based on the composition of major elements, Hantangang Basalt corresponded to trachybasalt, Daljeon Basalt to phonotephrite, Eoil Basalt to sub-alkaline basalt, and Daepodong Basalt to alkaline basalt. And in the composition of trace and rare earth elements, only Eoil Basalt showed the characteristics of arc basalt, while the others showed the characteristics of oceanic island basalt.

• Journal of Bio-Environment Control
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• v.32 no.4
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• pp.295-301
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• 2023

This study was conducted to determine the optimal dipping time and concentration of gibberellin for improving the growth and quality of domestic cultivar 'Seolhyang' strawberry when using runner plants. Strawberry runner plants were collected on November 10th and soaked in GA₃ concentrations of 50, 100, and 150 mg·L^-1 for 30 and 60 minutes, respectively. After 75 days of planting, the growth results showed that in the 30-minute, 50 mg·L^-1 treatment, the crown diameter was thicker and the T/R ratio was lower, indicating better plant vitality. Runner length increased with lower gibberellin concentrations, particularly promoting vegetative growth. Photosynthetic efficiency was more influenced by gibberellin concentration than dipping time, and using concentrations above a certain threshold acted as a stress factor for runner plants, leading to decreased photosynthetic efficiency. For enhancing seedling growth, soaking with 50 mg·L^-1 of gibberellin for 30 minutes was found to be optimal. This study verified the effects of gibberellin treatment on strawberry runner plants to improve plant growth and quality, providing useful basic data for using gibberellin.

• Food Science of Animal Resources
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• v.25 no.2
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• pp.134-140
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• 2005

This study was conducted to determine the effect of supplemented useful micro-organism on performance and meat quality of growing-finishing pigs for sixty days and broiler for six weeks. The pig and broiler were randomly allotted into 3 treatment; Control 0 (C), T1 (supplemented with $0.2\%$ Aspergillus terreus), T2 (supplemented with $0.2\%$ EM-pro). In total experimental period, feed conversion and dairy feed intake were tend to be higher in T2(2.09kg, 2.70kg) than others. But ADG (average daily gain) was tend to decreased n (0.78kg) according to supplemented of Aspergillus terreus diet These treatments were not significant difference. The chemical composition of pork were not significant difference except for crude fat Crude fat content was lower Aspergillus terreus treatments than others. The pH tenderness, WHC and heating loss were not significant difference in pork $(p>0.05)$. In chicken meat, heating loss and WHC of control was higher than that of T1 and n but shear value was higher in T1 and n. Values of juiciness, tenderness and flavor were improved with highly significant difference (p<0.05) in control (4.95, 4.85, 4.60) than T1 and n in pork. Although the meat color was not significant difference in pork but a and b values of control was higher than that of T1 and n in chicken meat (p<0.05).

• The Journal of Engineering Geology
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• v.15 no.2 s.42
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• pp.169-184
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• 2005

Unagsan and Sogrisan granites are widely distributed in the northern Gyeonggi massif and middle Ogcheon belt, respectively, and they show different petrologic characteristics as follows. The former has compact textures and light grey colors, and the latter has spotted miarolitic textures and pink colors. Most of the samples selected for tests are fresh and coarse-grained. And bored core samples were prepared so that they are vertical to the rift plane. The results of modal analysis show that Unagsan granite has significantly higher quartz and plagioclase contents (Qz+Pl) than Sogrisan granite. In contrast, alkali feldspar content (Af) of Sogrisan granite is much higher than that of Unagsan granite. Therefore, it is believed that the light grey colors of Unagsan granite are due to relatively high Qz+Pl, and the pink colors of Sogrisan granite are caused by higher Af. Fractures in Sogrisan granite have strongly perpendicular strike patterns and more dip values close to vertical compared with the fractures in Unagsan granite. Results of the fracture pattern analysis suggest that the Sogrisan granite has better potential to produce dimension stones than the Unagsan granite. However, miarolitic textures often found in the Sogrisan granite may be one of the factors reducing the granite quality. The Unagsan and Sogrisan granites have similar specific gravity values of 2.60 and 2.57, respectively. Absorption ratios and porosity values of Sogrisan granite are higher than those of Unagsan granite, and they shows linearly positive correlations. Compressive and tensile strengths of the Unagsan granite are generally higher than those of Sogrisan granite. These differences and variation trends found in physical properties of Unagsan and Sogrisan granite can be explained by the differences in the textures of Unagsan and Sogrisan granites, namely compact and miarolitic textures respectively. For Unagsan granite, compressive and tensile strengths are negatively correlated with porosity but for Sogrisan granite no specific correlations are found. This is probably due to the irregular dispersion patterns of miarolitic textures formed during the later stages of magmatic processes. Contrary to the trends found in absorption ratios, both granites have similar values of abrasive hardness, which can be explained by higher Qz+Af of the Sogrisan granite than those of the Unagsan granite and that quartz and alkali feldspar have relatively larger hardness values. For Sogrisan granite, compressive strength shows slightly positive correlations with Qz+Af+Pl and negative correlations with biotite and accessory mineral contents (Bt+Ac).

• Journal of Plant Biotechnology
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• v.35 no.1
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• pp.87-94
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• 2008

Porcine epidemic diarrhea virus (PEDV) is an infectious and highly contagious virus of swine. In order to develop the transgenic tobacco culture cells producing PEDV antigen protein, four vectors expressing PEDV spike protein (SP) gene under the control of a CaMV 35S promoter were constructed. Four fragments of the SP region of PEDV, SP1 (444 bp, 1487-1930 bp), SP2 (1.7 kb, 2300-3987 bp), SP3 (1.4 kb, 1559-2950 bp), and SP4 (2.6 kb, 9-2643 bp) were amplified by PCR and then C-MYC tag was fused to the end of each SP gene, respectively. These cassettes are inserted into the pCAMBIA2300 (named as 35S::SP1-M, 35S::SP2-M 35S::SP3-M, and 35S::SP4-M, respectively). Tobacco (cv. BY-2) cultured cells were transformed by co-cultivation with Agrobacterium tumefaciens harboring expression vector. We selected kanamycin-resistant calli and checked for the presence of the introduced SP gene using PCR, resulting 70% of them showed the foreign gene. We selected the lines with high-level expression of PEDV antigen protein based on dot blot analysis. Southern blot analysis confirmed that the PEDV SP gene was integrated into the genome of the tobacco cultured cells. Northern blot analysis showed that the introduced gene was highly expressed in transgenic cultured cells. Transgenic tobacco cultured cells-derived antigen induced immunogenicity in mice as determined by a plaque reduction neutralization assay. These results suggest that the vectors expressing PEDV spike protein gene in this study will be useful for the development of transgenic plants and cultured cells producing PEDV antigene protein.

• Journal of Acupuncture Research
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• v.22 no.3
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• pp.37-51
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• 2005

Mast cell is a cell that functions mainly in our body with a respect to inflammation and allergic response. Bee venom has been progressed in a study as a model related to mechanism in alleviation of pain until now, but it is being progressed in a study relevant to immunocyte in anti-inflammation or anti-allergic response. The present study is aimed to present the basis related to a future study of gene, by researching the influence of melittin and MCD Peptide, which are major ingredients in Bee venom, upon the expression of gene in the mast cell strain. In this study, it dealt with melittin and MCD Peptide respectively, in the effective concentration after passing though the experiment of cytotoxicity by using human mast cell strain. Also, with the respect in the aspect of expression in gene that changes at this time, information was obtained through the technique of analyzing microarray. Through experimental statistics, when regarding a case that global M is significant in more than 1 or -1, in melittin, all 7 genes were accelerated, and 8 inhibited. In MCDP, 7 genes were accelerated and 17 genes inhibited. The function in the body to which these genes are related, was associated with the protein binding within a cell, the activation in the function of lymphocyte, the acceptor related to macrophage antigen. In cell nucleus, substance related to GABA A receptor, protein associated with cAMP reactive element, substance related to complement system No.8 and to B-cell, protein substance related to polycystic kidney disease, substance related to inflammation, and the protein substance of influencing coagulation of blood. Through these results of analysis, it could obtain more useful materials in clarifying the mechanism of action in melittin and MCD peptide, which are in charge of mainly medical action in the abdomen. Also, it is thought that an in-depth study on the influence of main ingredients in Bee venom, the wholly honey bee venom aqua upon anti-allergic response or anti-inflammation are further required.