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Hang-Bok Lee,Jin-Seop Kim,Young-Chul Choi,Heui-Joo Choi,Kyungsu Kim 한국방사성폐기물학회 2014 방사성폐기물학회지 Vol.12 No.1
상대습도 데이터를 이용하여 벤토나이트 완충재 블록의 불포화 수리전도도 변화를 평가하였다. 불포화 매질에서의 물의 흐름을 나타내는 일반적인 분석해를 통해 상대습도를 통한 불포화 수리전도도 계산방안을 도출하였고, 이를 실제 수행한 실내 물 유입 실험 결과에 적용하여 포화가 진행됨에 따라 변화하는 완충재 불포화 수리전도도 양상을 확인하였다. 일반적인 포화 상태와는 확연히 다르게 수두 구배와 물의 유출량이 시간에 따라 불규칙하게 변화하는 결과를 나타냈으며, 벤토나이트 완충재의 불포화 수리전도도는 시간에 따라 증가하는 경향을 보였다. 수분 흡수로 인한 벤토나이트 입자 팽창 때문으로 인한 매질 내 공극의 부피 및 크기 확대가 불포화 수리전도도값의 증가를 야기하는 것으로 판단되었고, 이러한 결과는 완충재 블록의 팽창 정도와 수리전도도의 상관성에 관한 추후 연구의 필요성을 제시하였다. 본 연구에서 수행된 불포화 수리전도도 평가 방안은 방사성폐기물 처분 시 완충재의 장기적인 수리학적 성능평가에 유용한 기술로 사용될 수 있을 것이다.
Factors affecting waterproof efficiency of grouting in single rock fracture
Lee, Hang Bok,Oh, Tae-Min,Park, Eui-Seob,Lee, Jong-Won,Kim, Hyung-Mok Techno-Press 2017 Geomechanics & engineering Vol.12 No.5
Using a transparent fracture replica with aperture size and water-cement ratio (w/c), the factors affecting the penetration behavior of rock grouting were investigated through laboratory experiments. In addition, the waterproof efficiency was estimated by the reduction of water outflow through the fractures after the grout curing process. Penetration behavior shows that grout penetration patterns present similarly radial forms in all experimental cases; however, velocity of grout penetration showed clear differences according to the aperture sizes and water-cement ratio. It can be seen that the waterproof efficiency increased as the aperture size and w/c decreased. During grout injection or curing processes, air bubbles formed and bleeding occurred, both of which affected the waterproof ability of the grouting. These two phenomena can significantly prevent the successful performance of rock grouting in field-scale underground spaces, especially at deep depth conditions. Our research can provide a foundation for improving and optimizing the innovative techniques of rock grouting.
A capillary number for physical displacement of TCE-DNAPL trapped in a rough-walled fracture
Hang-Bok Lee,여인욱,지성훈,이강근 한국지질과학협의회 2011 Geosciences Journal Vol.15 No.3
A heterogeneous nature of rough-walled rock fractures complicates a recovery of DNAPL trapped in fractured rock aquifers, which forms a persistent plume within the fractured rocks and present a long-term source of contamination. Experimental studies were conducted to suggest a criterion for the physical displacement of DNAPL from rough-walled fractures in the context of capillary number (N_(ca)), a dimensionless number representing the ratio of the viscous to capillary forces. A series of experiments using water, surfactant solution and dense fluid were conducted in the range of capillary number from 2.29 × 10^(–4) to 3.41 × 10^(–2). The experimental results suggested that a higher capillary number than 1 × 10^(–2) be required for a near complete DNAPL removal (more than 95% of initial saturation) from rough-walled fractures. For capillary number on the order of 10^(–3), DNAPL can be mobilized or recovered to some degree. For the capillary number below 1 × 10^(–3), any kind of remedial fluids would have no effect on physical displacement. It is suggested that remedial fluid utilizing physical displacement be formulated to comply with N_(ca) > 1 × 10^(–2) to maximize a complete physical removal and the fluid utilizing chemical solubilization or reaction do with N_(ca) < 1 × 10^(–3) to minimize unwanted migration
MOLECULAR BREEDING OF HERBICIDE RESISTANT TRANSGENIC PLANTS WITH BROMOXYNIL SPECIFIC NITRILASE GENE
Bok Kee Min,Yearn Hung Park,Jae Young Song,Se Yong Lee 한국응용생명화학회(구 한국농화학회) 1993 한국응용생명화학회 학술발표회 Vol.1993 No.-
Bromoxynil is an antidicot herbicide widely used on cereal crops and has a short half life in the soil. A bxn gene, encoding a specific nitrilase that converts bromoxynil to its primary metabolite 3,5-dibromo-4- hydroxybenzoic acid, was inserted in plant binary vector pGA482, and then introduced into tobacco and lettuce plants via Agrobacterium mediated leaf-disc transformation method. Transgenic plants with the bxn gene were selected by kanamycin and regenerated to whole plants. The regenerated transgenic plants were determined level of expression of bxn gene by Northern blot analysis. The regenerated plants were tested for herbicide resistance under the presence of several concentrations of bromoxynil.