• 운동영양학회지
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• 제13권1호
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• pp.37-44
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• 2009

The purpose of this study was to investigate the change of bone metabolic parameters between climbing exercise training and treadmill running training with alpha lipoic acid supplementation in ovariectomized rats. Fifty-six Sparague-Dawley, 8 weeks of age, were assigned into nine groups: normal control at pre-test (Pre-NC), normal control at post-test (NC), sham-sedentary (SS), ovariectomized-control (OVX-Con), ovariectomized-ALA inject (OVX-ALA), ovariectomized-climbing exercise (OVX-CE), ovariectomized-ALA inject+climbing exercise (OVX-ACE), ovariectomized-treadmill exercise (OVX-TE) and ovariectomized-ALA inject+treadmill exercise (OVX-ATE). The climbing exercise group voluntarily climbed the 200 cm tower to drinking water from the bottle set at the top of it. The treadmill exercise group was performed the 60 min treadmill running with grade 6-8%, and velocity 10-15 m/min. The frequency of exercise training was performed 6 days per wk in both training intervention. For the comparison of bone metabolic responses following to different training intervention, the strength, length and weight of femur, total bone density, bone mineral contents, deoxypyridioline, osteocalcin and parathyroid hormone, estradiol and lutenizing hormone were measured in this study. The body weight was higher in the OVX-Con, OVX-ALA and OVX-TE groups as compared to NC group. The total bone mineral density of OVX-ACE showed a higher value than SS, OVX-Con, OVX-ATE and OVX-TE. But urine and blood metabolic parameters showed no significance among groups. In conclusion, this study results suggested that climbing exercise training and alpha lipoic acid supplementation may an effective intervention for prevention of osteoporosis in ovriectomized rats.

• 영어영문학
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• 제58권6호
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• pp.1041-1061
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• 2012

In the late nineteenth century, British colonial activities became aggressive and annexationist in the tropics, including the Southeast Asian Archipelago, which reflected the historical circumstances of both increasing resistance from the indigenous and severe competition among European powers. Interestingly, the change in English colonial policy toward an annexationist or imperialist vision adopted the motto of a civilizing mission, which was founded on the anthropological assumption that the white English were civilized, while the non-white indigenous were savage. The assumption developed into colonial discourse through systematic gathering of anthropological knowledge about the peripheries of the Empire. The knowledge system was flawed, which stressed the differences of the peripheral populations from the English and served as an inverted discourse on the Imperial Self rather than the description of the Other. Furthermore, the natives were heterogeneous, which rendered indistinct the racial and cultural differences between the English and the natives. Still, the aboriginals called Malays, who were comprised of many ethnic subgroups, needed to be deemed savage or inferior by the English in order to justify the English civilizing work or imperial ambition. Put differently, the representation of the English as civilized necessitated the (mis)representation of the natives as savage. In this context, Clifford's works contribute to systematic misrepresentation of the Malays, on which colonial discourse is founded, though not without self-contradiction. On the other hand, Conrad's novels that are set in the Malay Archipelago resort to a strategic misrepresentation that reveals the relativity of the discourse. Exploring the dilemma of denationalization to various degrees, Conrad's Malay texts problematize the (mis)representation of the indigenous as inferior, which is the basis of English claim to superiority.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.13-13
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• 2022

Recently, stable crop production is threatened by the effects of climate change. In particular, it is difficult to consistently maintain agricultural policies due to large price fluctuations depending on the difference in total domestic rice production from year to year. For stable rice production amid changes in the crop growing environment, development of varieties with improved disease resistance and abiotic stress stability is becoming more important. In here, drought and cold tolerant trait have been studied. First, for the development of drought tolerant varieties, we analyzed which agricultural traits are mainly affected by domestic drought conditions. As a result, it was observed that drought caused by the lack of water during transplanting season inhibits the development of the number of tiller and reduces the yield. 'Samgang' was selected as a useful genetic resource with strong drought tolerant and stable tiller number development even under drought conditions by phenotype screening. Three of drought tolerant QTLs were identified using doubled haploid (DH) population derived from a cross between Nacdong and Samgang, a drought sensitive and a tolerant, respectively. Among these QTLs, when qVDT2 and qVDTl1 were integrated, it was investigated that the tiller number development was relatively stable in the rainfed paddy field conditions. It is known that the high-yielding Tongil-type cultivars are severely affected by cold stress throughout the entire growth stage. In this study, we established conditions that can test the cold tolerance phenotype with alternate temperature to treat low temperatures in indoor growth conditions similar to those in field conditions at seedling stage. Three cold tolerant QTLs were explored using population derived from a cross between Hanareum2 (cold sensitive variety, Tongil-type) and Unkwang (cold tolerant variety, Japonica). Among these QTLs, qSCT12 showed strong cold tolerant phenotype, and when all of three QTLs were integrated, it was investigated that cold tolerant score was relatively similar to its donor parent, Unkwang, in our experimental conditions. We are performing that development of new variety with improved cold tolerant through the introduction of these QTLs.

• Advances in nano research
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• 제15권6호
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• pp.567-577
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• 2023

The killing of bacteria by mechanical forces on nanopatterned surfaces has been defined as a mechano-bactericidal effect. Inspired by nature, this method is a new-generation technology that does not cause toxic effects and antibiotic resistance. This study aimed to simulate the mechano-bactericidal effect of nanopatterned surfaces' geometric parameters and material properties against three implant-derived bacterial species. Here, in silico models were developed to explain the interactions between the bacterial cell and the nanopatterned surface. Numerical solutions were performed based on the finite element method. Elastic and creep deformation models of bacterial cells were created. Maximum deformation, maximum stress, maximum strain, as well as mortality of the cells were calculated. The results showed that increasing the peak sharpness and decreasing the width of the nanopatterns increased the maximum deformation, stress, and strain in the walls of the three bacterial cells. The increase in spacing between nanopatterns increased the maximum deformation, stress, and strain in E. coli and P. aeruginosa cell walls it decreased in S. aureus. The decrease in width with the increase in sharpness and spacing increased the mortality of E. coli and P. aeruginosa cells, the same values did not cause mortality in S. aureus cells. In addition, it was determined that using different materials for nanopatterns did not cause a significant change in stress, strain, and deformation. This study will accelerate and promote the production of more efficient mechano-bactericidal implant surfaces by modeling the geometric structures and material properties of nanopatterned surfaces together.

• 한국항행학회논문지
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• 제26권6호
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• pp.510-515
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• 2022

본 논문에서는 마이크로리터 부피의 에탄올 수용액 농도를 검출하기 위한 마이크로스트립 패치 센서 안테나를 제안하였다. 비유전율 변화에 대한 감도를 높이기 위해 패치의 방사 모서리에 직사각형 슬롯을 추가하였다. 높은 비유전율과 높은 손실 탄젠트를 가지는 극성 액체인 에탄올 수용액을 패치에 놓으면 발생하는 낮은 입력 저항을 개선하기 위해 1/4 파장 임피던스 변환기를 50 오옴 급전선과 패치 사이에 추가하여 0.76 mm 두께의 RF-35 기판에 안테나를 제작하였다. 원통형 용기를 아크릴로 제작하여 15 마이크로리터 부피의 에탄올 수용액을 에탄올 농도 0% ~ 100%까지 20% 농도 간격으로 만들어 실험하였다. 실험 결과, 에탄올 수용액의 에탄올 농도가 0%에서 100%로 증가할 때 공진 주파수가 1.947 GHz에서 2.509 GHz로 증가하여 농도검출 센서로서의 성능을 입증하였다.

• 전자통신동향분석
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• 제38권6호
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• pp.41-51
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• 2023

Heat dissipation technology for semiconductors and electronic packaging has a substantial impact on performance and lifespan, but efficient heat dissipation is currently facing limited improvement. Owing to the high integration density in electronic packaging, heat dissipation components must become thinner and increase their performance. Therefore, heat dissipation materials are being devised considering conductive heat transfer, carbon-based directional thermal conductivity improvements, functional heat dissipation composite materials with added fillers, and liquid-metal thermal interface materials. Additionally, in heat dissipation structure design, 3D printing-based complex heat dissipation fins, packages that expand the heat dissipation area, chip embedded structures that minimize contact thermal resistance, differential scanning calorimetry structures, and through-silicon-via technologies and their replacement technologies are being actively developed. Regarding dry cooling using single-phase and phase-change heat transfer, technologies for improving the vapor chamber performance and structural diversification are being investigated along with the miniaturization of heat pipes and high-performance capillary wicks. Meanwhile, in wet cooling with high heat flux, technologies for designing and manufacturing miniaturized flow paths, heat dissipating materials within flow paths, increasing heat dissipation area, and reducing pressure drops are being developed. We also analyze the development of direct cooling and immersion cooling technologies, which are gradually expanding to achieve near-junction cooling.

• 멤브레인
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• 제33권5호
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• pp.248-256
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• 2023

ITO 투명 전극 필름은 디스플레이, 전기 자동차 등 산업 전 범위에서 널리 사용되는 전자 재료이다. 본 연구에서는 이러한 indium tin oxide (ITO) 필름의 열성형 안정성을 향상시키기 위하여 Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) 전도성 고분자 코팅 용액 조성을 결정하였다. 1000 S/cm의 고 전도성을 보이는 PEDOT:PSS 용액에 끓는점이 각기 다른 4가지 종류의 용매를 희석하였고, 코팅 전 후 면저항 변화를 분석하였다. 또한 380~800 nm 영역의 광 투과율 분석 및 Raman 스펙트럼 분석을 통하여 PEDOT:PSS 박막이 코팅된 ITO 투명 전극의 전기적 특성 결정 메커니즘을 규명하였다. 230℃ 열성형 공정 결과 ITO 필름은 113% 연신 상태에서 이미 전기 전도성을 읽었지만, ethylene glycol을 희석 용매로 사용하여 얻어진 전도성 고분자 박막이 적용된 ITO 필름은 126% 고 연신 상태에서도 초기 60 Ω/sq 면저항을 246 Ω/sq로 유지하는 우수한 전기 전도성을 보였다.

• 한국터널지하공간학회 논문집
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• 제25권6호
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• pp.447-458
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• 2023

본 연구에서는 쉴드터널 세그먼트 라이닝의 하중과 부재저항의 확률적 특성뿐만 아니라 경계조건의 변동성을 고려한 비교모델을 선정하고 신뢰성해석을 수행하였으며, 파괴확률 산정 및 구조안전성 검토를 통해 한계상태설계의 적정성에 대해 분석을 수행하였다. 이러한 지반 정수의 확률특성치를 고려한 해석을 위해 지반스프링계수는 Muirwood식을 적용하여 정량적 값을 산정하여 Mean값으로 고려하였고, 변동계수는 기존 연구자료를 토대로 지반 경계조건 변화에 따른 검토대상 모델들을 선정하였다. 이러한 모델들에 대한 구조해석과 MCS기법을 적용한 신뢰성분석을 통해 파괴확률과 신뢰성지수를 산정하여 지반경계조건 변화에 따른 파괴확률의 변화를 검토하였다.

• 한국물환경학회지
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• 제40권2호
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• pp.79-88
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• 2024

This study employed field measurements and biogeochemical analysis to examine the effects of seasonal conditions (e.g., temperature and precipitation) and human intervention (e.g., dam or weir construction) on the chemical composition of dissolved organic matter, flocculation kinetics of suspended particulate matter, and formation of the fluid mud layer on riverbeds. The results indicated that a water environment with a substantial amount of biopolymers offered favorable conditions for flocculation kinetics during an algal bloom period in summer; a thick fluid mud layer was found to be predominated with cohesive materials during this period. However, after high rainfall, a substantial influx of terrigenous humic substances led to enhanced stabilization of the particulate matter, thereby decreasing flocculation and deposition, and the reduced biopolymer composition served to weaken the erosion resistance of the fluid mud on the riverbed. Moreover, a high-turbulence condition disaggregated the flocs and the fluid mud layer and resuspended the suspended particulate matter in the water column. This study demonstrates the mutual relationship that exists between biogeochemistry, flocculation kinetics, and the formation of the fluid mud layer on the riverine area during different seasons and under varying hydrological conditions. These findings are expected to eventually help inform the more optimal management of water resources, which is an urgent task in the face of anthropogenic stressors and climate change.

• 산업진흥연구
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• 제9권1호
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• pp.189-202
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• 2024

지구상에 분포하고 있는 수맥 자체가 해로운 것이 아니라 수맥으로부터 발생하는 수맥 파가 인체 건강에 해롭다는 것이다. 지구의 고유진동수는 7.83Hz인데 깊은 잠을 자기 위해서는 이 진동수보다 낮은 델타파로 2~3.99Hz의 상태로 내려가야만 가장 깊은 잠을 잘 수 있어 건강을 유지할 수가 있다. 그렇지만 수맥 파가 있는 곳에서 잠을 자게 되면 수맥 파가 뇌파를 간섭하여 잠을 잘 자지 못하고, 악몽을 꾸기도 하고, 자고 일어나도 몸이 개운하지 못하고 피로가 다 풀리지 않아 쉽게 지치고 피곤함을 느끼게 된다. 이 같은 현상이 지속해서 이루어지다 보면 몸의 저항력이 떨어지고 면역력이 약해져서 결과적으로 병을 유발하는 원인이 될 수 있고, 각종 질병을 얻게 되어 건강을 해칠 수가 있다. 즉 수맥파로부터 가장 안전하고 간단히 대처할 수 있는 효과적인 방법은 수맥이 있는 곳은 피하고, 수맥이 없는 곳으로 잠자는 자리만 바꿔도 건강하고 행복한 생활을 할 수 있다는 것을 사례를 통해서 규명하고자 한다.