• KOREAN POULTRY JOURNAL
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• v.37 no.8 s.430
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• pp.65-70
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• 2005

제4회 2005년 한국국제축산박람회가 오는 8월 31일부터 9월 2일까지 KOTRA 대전무역전시관(KOTREX), 엑스포과학공원에서 '깨끗한 환경과 안전한 축산물'이라는 주제로 열린다. 본 박람회 주최는 대한양돈협회, 대한양계협회, 한국낙농육우협회, 전국한우협회, 한국축산환경시설기계협회가 되고, 대한양돈협회, 2005한국국제축산박람회추진위원회, KOTREX가 공동 주관한다. 행사 후원은 농림부, 농협중앙회, 한국사료협회, 대전광역시, 충청남도가 맡았다. 이번 박람회는 출품하는 전시업체와 참관객인 축산농가를 위한 박람회로 꾸미기 위해 우선 장소를 대전 무역전시관(KOTREX)으로 옮겨 축산농가들이 쉽게 찾아올 수 있도록 했으며, 전시부스 내에서 실제적인 상담과 거래가 활성화 될 수 있도록 시식행사 등 부대행사는 옥외에서 치러질 수 있도록 하였다. 2005 한국국제축산박람회는 체험박람회, 참여박람회, 비즈니스박람회라는 목표하에 전시면적 15,250제곱미터에 15개국 178여개업체가 600부스 규모로 열리게 된다. 출품대상품목은 축산기자재 및 시설, 배합사료, 동물약품, 생명공학 제품, 축산물 위생 및 가공시설, 축산물 및 가공식품, 가축분뇨 자원화 처리시설, 종축, 리모델링 관련 설비 및 기술, 컨설팅 관련 정보 및 기술 등이 있다. 부대행사로는 축산물 시식회, 축산관련 학술 세미나, 우수전시업체 선발 및 시상, 전국대학생 포스터 경진대회 및 시상, 종축 전시와 경매, 재래닭 및 특수가금 전시, 애완견 및 명견전시, 돼지달리기 및 사진찍기 등이 개최된다. 박람회 참관객은 외국인 바이어 1,000명을 포함하여 10만명에 이를 것으로 추정하고 있다. 학술행사는 박람회 기간 동안 엑스포과학기념관과 대전전시관 세미나실에서 양계세미나, 축산기자재세미나, 축산기술세미나, 양돈포럼, 낙농세미나, 한우세미나, 양돈세미나가 열리게 된다.

• Journal of the Korean Society of Propulsion Engineers
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• v.19 no.3
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• pp.9-19
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• 2015

Experimental research on characteristics of particle-laden jet by using a coaxial injector was conducted in order to design fuel and oxidizer injectors of the supercavitation underwater vehicle. $1{\mu}m$ and $42{\mu}m$ particles was simultaneously injected to obtain particle and fluid velocity. Small particles($1{\mu}m$) and large particles represent fluid and fuel characteristics respectively. Small particles, which was processed using PIV algorithms, and one for the large particles processed using PTV algorithms. Fluid phase axial velocity increases according to particle loading ratio increases, and particles are located at the outside of the high vorticity region in a mixing layer of a coaxial injector.

• Journal of Korean Tunnelling and Underground Space Association
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• v.12 no.1
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• pp.31-41
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• 2010

This paper presents both numerical and physical modeling approaches for the dilation and spalling of rock recognized as typical process of rock around an underground opening at depth. For physical approach, laboratory testing of rectangular beams using a synthetic rock was used to investigate the onset of dilation and spalling. The beams are axially compressed and subjected to 4-point bending to provide non-uniform compressive stresses which are similar to the maximum tangential stress distribution around circular openings. Discrete element numerical analyses using commercial code $PFC^{2D}$ (Particle Flow Code) were performed to evaluate the stress path at various locations in the beams. The findings from these approaches suggest that the onset of dilation in laboratory tests appears to be a good indicator for assessing the stress magnitudes required to initiate spalling.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.34 no.3
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• pp.92-97
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• 2024

To improve the efficiency of water splitting systems for hydrogen production, the high overvoltages of electrochemical reactions caused by catalysts in the oxygen evolution reaction (OER, Oxygen Evolution Reaction) must be reduced. Among them, LDH (Layered Double Hydroxide) compounds containing transition metal such as Ni, are attracting attention as catalyst materials that can replace precious metals such as platinum that are currently used. In this study, nickel foam, an inexpensive metallic porous material, was used as a support, and NiCo LDH (Layered Double Hydroxide) nanocrystals were synthesized through a hydrothermal synthesis process. In addition, changes in the shape, crystal structure, and water decomposition characteristics of the Mo-doped NiCo LDH nanocrystal samples synthesized by doping Mo to improve OER properties were observed.

• The Journal of Engineering Geology
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• v.15 no.2 s.42
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• pp.213-227
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• 2005

This study aims to assess the problems with investigation method and to suggest the complementary solutions by comparing the predicted data from surface investigation with the outcome data from underground cavern. In the study area, one(NE-1) of 6 fracture zones predicted during the surface investigation was only confirmed in underground caverns. Therefore, it is necessary to improve the confidence level for prediction. In this study, the fracture classification criteria was quantitatively suggested on the basis of the BHTV images of NE-1 fracture zone. The major orientation of background fractures in rock mass was changed at the depth of the storage cavern, the length and intensity were decreased. These characteristics result in the deviation of predieted predicted fracture properties and generate the investigation bias depending on the bore hole directions and investigated scales. The evaluation of hydraulic connectivity in the surface investigation stage needs to be analyze by the groundwater pressures and hydrochemical properties from the monitoring bore hole(s) equipped with a double completion or multi-packer system during the test bore hole is pumping or injecting. The hydraulic conductivities in geometric mean measured in the underground caverns are 2-3 times lower than those from the surface and furthermore the horizontal hydraulic conductivity in geometric mean is six times lower than the vertical one. To improve confidence level of the hydraulic conductivity, the orientation of test hole should be considered during the analysis of the hydraulic conductivity and the methodology of hydro-testing and interpretation should be based on the characteristics of rock mass and investigation purposes.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.2
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• pp.13-21
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• 2000

Au-black for the application of the long wavelength infrared absorber has been prepared by evaporating Au under nitrogen gas-filled low vacuum condition. Characteristics of the deposited Au-black were carefully investigated through structural analysis, infrared absorbance measurement, and patterning of the layer, all of which are dependent on the deposition condition. High density of micro-cavity that trapped infrared were obtained, and infrared absorbance in the wavelength range from 3 $\mu\textrm{g}$ to 14 $\mu\textrm{g}$ was found to be about 90% when the Au-black layer was produced under the deposition condition of mass Per area of about 600 $\mu\textrm{g}$/cm$^{2}$ and chamber pressure of above 1 Torr. Photoresist lift-off process could be performed to pattern the Au-black, of which mass per area was below 900 $\mu\textrm{g}$/cm/ sup 2/. In view of absorbance, heat capacity, and pattern formation, the deposition condition of chamber pressure of about 1 Tow and mass per area of about 600$\mu\textrm{g}$/cm$^{2}$ was most adequate for preparing the Au-black as an infrared absorber.

• Korean Journal of Agricultural and Forest Meteorology
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• v.6 no.2
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• pp.118-126
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• 2004

Grid is a new Information Technology (IT) concept of "super Internet" for high-performance computing: worldwide collections of high-end resources such as supercomputers, storage, advanced instruments and immerse environments. The Grid is expected to bring together geographically and organizationally dispersed computational resources, such as CPUs, storage systems, communication systems, real-time data sources and instruments, and human collaborators. The term "the Grid" was coined in the mid1990s to denote a proposed distributed computing infrastructure for advanced science and engineering. The term computational Grids refers to infrastructures aimed at allowing users to access and/or aggregate potentially large numbers of powerful and sophisticated resources. More formally, Grids are defined as infrastructure allowing flexible, secure, and coordinated resource sharing among dynamic collections of individuals, institutions and resources referred to as virtual Organizations. GRID is an emerging IT as a kind of next generation Internet technology which will fit very well with agrometeorological services in the future. I believe that it would contribute to the resource sharing in agrometeorology by providing super computing power, virtual storage, and efficient data exchanges, especially for developing countries that are suffering from the lack of resources for their agmet services at national level. Thus, the establishment of CAgM-GRID based on existing RADMINSII is proposed as a part of FWIS of WMO.part of FWIS of WMO.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.1
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• pp.55-61
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• 2023

This study aims to develop CLSM fill material for emergency restoration using landfill coal ash. As a result of examining physical properties such as particle size distribution and fines content of landfill coal ash, bottom ash, fly ash, and general soil were mixed, and SP was found to have a density of 2.03 and a residual particle pass rate of 7.8 %. CLSM materials that secure fluidity in unit quantities without using chemical admixtures such as glidants and water reducing agents have a high risk of material separation due to bleeding. As a result of this experiment, it was found that the bleeding ratio did not satisfy the standard in the case of the specimen with a large amount of fly ash and a lot of addition of mixing water. As a result of the compressive strength test, the strength development of 0.5 MPa or more for 4 hours was found to be satisfactory for the specimens using hemihydrate gypsum with a unit binder amount of 200 or more, and the remaining gypsum showed poor strength development. Although it is judged that landfill coal ash can be used as a CLSM material, it is necessary to identify and apply the physical and chemical characteristics of coal ash buried in the ash treatment plant of each power generation company.

• Journal of the Korean Geotechnical Society
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• v.26 no.6
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• pp.5-19
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• 2010

The purpose of this study is to figure out the effect of pressurized grouting on the pullout resistance and the group effect of the compression ground anchor by performing pilot-scale chamber tests and field tests. The laboratory tests are carried out for 3-types of soils which are abundant in the Korean peninsular. Experimental results showed that the enlargement of anchor diameters estimated from the cavity expansion theory matches reasonable well with that obtained from experiments. Moreover, the required injection time as a function of the coefficient of permeability of each soil type was proposed. A series of in-situ anchor pullout tests were also performed to experimentally figure out the effect of pressurized grouting on the pullout resistance. Experimental results also showed that the effect of the pressurized grouting is more prominent in a softer ground with smaller SPT-N value in all of the following three aspects: increase in anchor diameter; pullout resistance; and surface roughness. The pressurized grouting effect in comparison with gravitational grouting was found to be almost nil if the SPT-N value is more than 50. Based on experimental results, a new equation to estimate the pullout resistance as a function of the SPT-N value was proposed. And based on in-situ group anchor pullout tests results, a new group effect equation was proposed which might be applicable to decomposed residual soils which are abundant in the Korean peninsular.

• Journal of Plant Biotechnology
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• v.50
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• pp.63-69
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• 2023

This study includes the transformation of genes such as ORE7, the increase of gene expression, and the use of the bar gene as a selectable marker that shows herbicide resistance with Agrobacterium tumefaciens using hypocotyls from the oilseed rape "Youngsan" cultivar. To establish an Agrobacterium transformation system for the production of oilseed rape with a high-yield trait, infection time and co-cultivation period with Agrobacterium were tested. Therefore, when hypocotyls from the oilseed rape "Youngsan" cultivar were infected with Agrobacterium for 20 min and co-cultivated for 3 days, approximately 32-36 putatively transformed hypocotyls with shoots including roots survived from 100 inoculated hypocotyls after 4 weeks of transformation on a selection medium containing 20 mg/L of phosphinothricin (PPT) as a selectable agent. Additionally, a PCR assay was performed to confirm the insertion of target genes and showed the presence of the ORE7 gene as a high-yielding trait and the bar gene as a selectable marker. Treatment with 0.5% (v/v) Basta solution as a selectable agent for 6 days with leaves from transformed oilseed rape expressed the bar gene. Therefore, this study can contribute to the development of special oilseed rapes containing agriculturally useful traits such as herbicide resistance, drought tolerance, high yielding traits, and high oleic acid content.