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RISS 인기검색어
- 검색키워드
- 저자 : 박준범(Park Junboum) (검색결과 36 건)
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김경태,박준범,Kim, Kyungtae,Park, Junboum 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.3
Rhodamine B Hydrazide as a novel fluorescent and colorimetric probe exhibiting remarkably selective fluorescence enhancement toward Hg<sup>2+</sup> ion over other 16 metal ions is herein introduced. The probe reacts with Hg<sup>2+</sup> ion followed by its spirolactam ring-opening to give a remarkable enhancement of absorption maximum at 550 nm as well as an enhanced fluorescence intensity at 580 nm in aqueous media. Upon titration with Hg<sup>2+</sup> ion in various concentration of 10~200 uM, we found that the probe shows a marked color change from colorless to pink, enabling naked-eye detection toward mercury ion. In addition, in the presence of Hg<sup>2+</sup> ion, the probe gave rise to change from non-florescence to strong orange fluorescence (Off-On) with a good linearity of R<sup>2</sup>=0.97. This preliminary results demonstrate that the fluorescent chemosensor we herein introduced can open a new strategy for marked selective and sensitive detection of mercury ions in contaminated soil containing various metal ions.
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박규홍,박준범,Park, Kyoohong,Park, Junboum 대한상하수도학회 1997 상하수도학회지 Vol.11 No.2
Between 40,000 and 60,000 liters of light oil were spilled when an underground pipe broke at a newly constructed landfill site in coastal area, Korea. Methods were presented to examine the subsurface distribution of the contaminants in hydrocarbon-contaminated soil. As results, large quantities of oil and grease were found to have migrated horizontally at the site. Oil and grease plume at concentrations of 38-88 mg/kg was formed horizontally through silty sand with gravel fill and the vertical movement of the contaminants was thought to be limited to groundwater level between 2 and 4 m corresponding to sea water level. Right after finding the leakage area, the early action of excavation and pumping out the mixture of groundwater and oil was taken and it was proved to be very effective for preventing further contamination. Two months after the leakage, oil and grease in sea water sample near contaminated area was not detectable.
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개량 벤토나이트와 현장토 혼합 차수층의 염수조건하에서의 투수성 평가
서흠,오명학,박준범,Xu, Xin,Oh, Myounghak,Park, Junboum 한국지반공학회 2017 한국지반공학회논문집 Vol.33 No.11
A bentonite mixing with local soil widely used as liner layer for landfill should have low permeability less than $1{\times}10^{-7}cm/s$. But there are several limitations of bentonite used as liner layer, such as drying shrinkage cracking, ineffective waterproof ability under salt water condition like flocculation under sea water. The purpose of this research is the development of a salt resistance bentonite by mixing sepiolite and guar gum to overcome the weak points of bentonite to get high water resistance capacity and permeability coefficient below $1{\times}10^{-7}cm/s$ under salt water condition. After having performed drying shrinkage cracking test, swelling index test, compaction test, and hydraulic conductivity test we confirmed the optimal mixing ratio of materials and evaluated the performance of materials.
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박인준,곽창원,박준범,한자중,Park,Innjoon,Kwak,Changwon,Park,Junboum,Han,Jajung 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5
최근 늘어나고 있는 폐기물량에 따라 폐기물 매립장의 건설이 증가하고 있으며, 매립장 내 폐기물의 격리, 보호 및 환경오염방지를 위하여 토목섬유가 널리 활용되고 있다. 토목섬유는 주변의 흙과 접촉면을 형성하여 폐기물 매립장의 전단 거동에 영향을 미치게 된다. 폐기물 침출수에 포함된 화학적 요소는 이러한 접촉면 거동에 중요한 영향을 미치며, 지진과 같은 동적하중 또한 접촉면 거동에 미치는 화학적 영향을 가속화시킬 수 있다. 따라서 본 연구에서는 화학적 영향을 고려한 접촉면 전단강도 감소효과를 반영하여 수치해석을 수행하였다. 반복 단순전단시험 결과를 바탕으로 수치해석을 수행한 결과, 접촉면 전단강도 감소를 미 고려시 폐기물 매립장의 동적 안정성을 과대평가할 수 있다고 판단된다. The number of the waste landfill site increases continuously in recent years. Various types of geosynthetics have been utilized in the waste landfill site for encapsulating, isolating, protecting, and so on. Geosynthetics compose the interface with soil and affect the shear behaviors of waste landfill system. The chemical aggressors in the leachate also play a critical role in the interface and it is known that the dynamic loading is able to accelerate manifestation of the effects of chemical attack. In this research, numerical analysis was conducted considering shear stress degradation in the geosynthetic-soil interface due to dynamic load with chemical effect. Cyclic simple shear test results was reviewed and applied to the numerical modeling as well. Consequently, the stability of waste landfill site could be overestimated without considering the shear stress degradation of interface.
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