• 한국물환경학회지
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• 제20권1호
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• pp.37-41
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• 2004

This paper was studied about the characteristics of treatment by ionized gas for livestock wastewater, aiming at the effects of ionized gas on organic matter, hydrophobic and hydrophilic organic matter in livestock wastewater when the new process of advanced oxidation process was applied for meeting the improved the quality of effluent. The organic matter within treated livestock wastewater by ionized gas was partially mineralized according to the time increasement. The $TCOD_{Mn}$ in the livestock wastewater was decreased from 840mg/L to 340mg/L when treated by ionized gas by the enhancement of time. We occupied the equations of $TCOD_{Cr}$, $SCOD_{Cr}$, $TCOD_{Mn}$ and $SCOD_{Mn}$ as to ionized gas treated time. As $TCOD_{Mn}$ increasing ionized gas treated time, the concentration did not meet the water quality, $COD_{Mn}$ 4Omg/L. So, for removing of the remaining organic matter in the efflent after ionized gas, following process is necessary. After treating the livestock wastewater by ionized gas, coagulation was considerable for organic matter removal up to regulation water quality. From UV scans of the treated livestock wastewater by ionized gas, the wastewater has low aromaticity and good colour.

• 대한수의학회지
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• 제50권3호
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• pp.171-177
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• 2010

The purpose of this study was to evaluate the osteogenic capacity of water extract of danshen (Salvia miltiorrhiza Bunge). We have established in rat critical-sized calvarial defect model using the combination with collagen scaffold and danshen hydrophilic extract. All rats were extinguished at 8 weeks after bone graft surgery, and the bone regeneration ability of bone grafting sides was evaluated by plain radiography and micro-CT. These results revealed water extract of danshen had the potential to promote osteogenesis especially continuous oral administration with local treatment compared to one-shot local treatment. This compound may provide a new alternative agent for growth factors to promote bone healing and bone regeneration. In conclusion, these results suggest that danshen hydrophilic extract have the potential to promote osteogenesis in bone defects. Further studies about fusion technology with salvianolic acid B, peptides, growth factors, and scaffolds using of the combination of tissue engineering, cell engineering and mechanical engineering are needed.

• 한국분말재료학회지
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• 제29권5호
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• pp.363-369
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• 2022

AlSi10Mg alloys are being actively studied through additive manufacturing for application in the automobile and aerospace industries because of their excellent mechanical properties. To obtain a consistently high quality product through additive manufacturing, studying the flowability and spreadability of the metal powder is necessary. AlSi10Mg powder easily forms an oxide film on the powder surface and has hydrophilic properties, making it vulnerable to moisture. Therefore, in this study, AlSi10Mg powder was hydrophobically modified through silane surface treatment to improve the flowability and spreadability by reducing the effects of moisture. The improved flowability according to the number of silane surface treatments was confirmed using a Carney flowmeter. In addition, to confirm the effects of improved spreadability, the powder prior to surface treatment and that subjected to surface treatment four times were measured and compared using s self-designed recoating tester. The results of this study confirmed the improved flowability and spreadability based on the modified metal powder from hydrophilic to hydrophobic for obtaining a high-quality additive manufacturing product.

• 한국의류학회지
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• 제16권1호
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• pp.65-71
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• 1992

The influences of hydrophilic treatment of the PET fabric on soiling and detergency of triolein were studied. The amounts of residual triolein were determined by radiotracer analysis, and distributions of the unsaturated oils on the fabric were evaluated by backscattered electron images. The removal of triolein was increased when the PET fabrics were treated. SRP pretreatment was more effective on the oily soil removal than the of addition of SRP in the detergent. The oily soil of triolein only was packed between the fibers, but mixed soil was distributed around the fibers. When the mixed soil was used, detergent solution could penetrate the continuous interfiber capillaries, this would be one of the reasons that mixed soil was removed rmore extensively.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.222.2-222.2
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• 2014

대기압 플라즈마는 기존의 저압 플라즈마에 비해 제작이 간단하고 조작이 간편하기 때문에 응용 가능 분야가 넓다는 장점이 있지만 다양한 외부 요인으로 인한 안정성의 문제로 저압 플라즈마의 모든 응용범위를 대신하기에는 문제점이 있다. 현재 이 문제점을 해결하기 위한 연구가 활발히 진행 중에 있으며, 기판 및 유리 세정, Bio-medical, 물질 합성 등 다양한 분야에 대한 응용 연구도 진행 중에 있다. 본 연구에서는 본 연구실에서 자체 개발한 전원 장치를 이용하여 대기압 플라즈마를 발생 시켰으며, He, Ar Gas를 이용하여 PDMS 기판과 유리 기판에 표면 처리 한 후 친수성 비교 분석 실험을 실시하였다. Optical Emission Spectroscopy(OES)장치와 ICCD camera를 이용하여 플라즈마 진단과 특성 분석을 실시하였으며 Computer Numerical Control (CNC) x-y-z 3축 stage를 이용하여 플라즈마 발생을 제어함으로서 재현성을 높은 플라즈마 표면 처리 연구를 진행 하였다.

• 한국수소및신에너지학회논문집
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• 제17권4호
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• pp.379-388
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• 2006

Two mesophilic trickling bed bioreactors filled with two different types of media, hydrophilic- and hydrophobic-cubes, were designed and conducted for hydrogen production under the anaerobic fermentation of sucrose. Each bioreactor consisted of the column packed with polymeric cubes and inoculated with heat-treated sludge obtained from anaerobic digestion tank. A defined medium containing sucrose was fed by the different hydraulic retention time(HRT), and recycle rate. Hydrogen concentrations in gas-phase were constant, averaging 40% of biogas throughout the operation. Hydrogen production rate was increased till $10.5\;L{\cdot}h^{-1}{\cdot}L^{-1}$ of bioreactor when influent sucrose concentrations and recycle rates were varied. At the same time, the hydrogen production rate with hydrophobic media application was higher than its hydrophilic media application. No methane was detected when the reactor was under a normal operation. The major fermentation by-products in the liquid effluent of the both trickling biofilters were acetate, butyrate and lactate. In order to run in the long term operation of both reactor filled with hydrophilic and hydrophobic media, biofilm accumulation on hydrophilic media and biogas produced should be controlled through some process such as periodical backwashing or gas-purging. Four sample were collected from each reactor on the opposite hydrogen production rate, and their bacterial communities were compared by terminal restriction fragment length polymorphism (T-RFLP) analysis of PCR products generated using bacterial 16s rRNA gene primers (8f and 926r). It was expressed a marked difference in bacterial communities of both reactors. The trickling bed bioreactor with hydrophobic media demonstrates the feasibility of the process to produce hydrogen gas. A likely application of this reactor technology can be hydrogen gas recovery from pre-treatment of high carbohydrate-containing wastewaters.

• 한국전기전자재료학회논문지
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• 제23권1호
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• pp.65-69
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• 2010

In this study, we compared two methods(an acid treatment in strong acid reflux and a heat treatment in air atmosphere) for hydrophilic surface treatment of multi-walled carbon nanotubes(MWNT) to enhance the capcity of $RuO_2$/MWNT composite electrode materials for ultracapacitor. Both treatments generated a number of defects on the surface of MWNT by the breakage of $\pi$ bond in graphene layer at which carboxyl groups were introduced. However, the degree of hydrophilicity generated by strong acid treatment was higher than that by heat treatment in air, which was revealed by the quantitative measurement of surface carboxyl groups by using Boehm titration. The increased hydrophilicity save rise to an improved dispersity of $RuO_2$ nanoparticles on MWNT. Finally, the improved dispersity resulted in the capacity enhancement of composite electrode materials for ultracapacitor.

• 분석과학
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• 제12권5호
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• pp.441-446
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• 1999

무우 유식물의 자엽에서 Abscisic acid(ABA). ABA plus cyeloheximide(CH)와 ABA plus polyamine(PA) 처리로 유도되는 아미노산의 변화를 분석하였다. ABA 처리로 봄무우에서는 총 아미노산의 농도가 증가되었고, 겨울무우에서는 감소되었다. 봄무우에서는 친수성 아미노산인 proiine, glycine, serine과 cysteine 등이 증가되었고(특히 proline), 반면 겨울무우에서는 cysteine, leucine와 phenylalanine이 증가되었다(특히 cysteine과 leucine). CH는 ABA가 유도시킨 탈수에 대항할 수 있는 단백질의 합성을 방해하여 아미노산의 축적을 초래하였다. PA처리는 반대로 봄무우에서는 총 아미노산의 농도가 감소되었고, 겨울무우에서는 증가되었다. 이상의 결과는 축적된 친수성 아미노산과 단백질이 스트레스에 대항하여 탈수의 적응을 유도하였고, PA은 ABA에 의한 탈수 스트레스의 적응능력을 조절한다고 본다.

• 한국건축시공학회지
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• 제18권1호
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• pp.51-57
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• 2018

이 연구의 목적은 친수성 표면개질의 에어로겔을 활용한 높은 단열 콘크리트 재료 개발의 기초 평가이다. 시멘트계 재료에서 에어로겔의 재료분리 방지 및 분산성 향상을 위하여 소수성 에어로겔의 표면은 계면활성제를 이용하여 친수성을 부여하였다. 시멘트 페이스트에서 에어로겔의 첨가양은 시멘트 부피 대비 0%에서 100%로 변화하였다. 일부 시멘트 페이스트는 배합단계에서 재료분리 및 에어로겔의 뭉침현상이 나타났다. 에어로겔의 혼입은 시멘트 페이스트의 압축강도를 저하시키는 반면 열전도율은 향상시켰다. 에어로겔을 100% 첨가한 페이스트의 열전도율은 일반 페이스트 대비 약 43% 낮았다. 에어로겔 혼입 콘크리트의 압축강도와 단열성 향상을 위해서는 에어로겔의 최적 표면개질에 대한 연구가 요구되었다.

• 조명전기설비학회논문지
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• 제23권12호
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• pp.184-190
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• 2009

표면의 친수성 작용기 형성과 접촉각 향상을 위하여 대기압 플라즈마를 이용하여 Tri-acetyl-cellulose(TAC) 필름에 대한 표면개질을 연구하였다. TAC 필름의 표면개질 목적으로 대기압에서 플라즈마를 발생시키기 위한 Dielectric barrier discharge(DBD) 구조의 플라즈마 반응기 내에서 이온화된 질소 플라즈마를 사용하였다. 플라즈마 처리 공정변수인 처리속도, 방전전력, 방전 갭 및 질소 가스 유속을 변화시켜가며 접촉각을 측정하여 접촉각과 표면에너지 변화를 검토하였다. 대기압 플라즈마 처리속도 100[mm/sec], 방전 전력 1.5[kW], 방전 갭 2[mm] 및 $N_2$ 가스유량 140[LPM] 에서 가장 높은 접촉각과 표면에너지 값을 보였다. 표면친수화의 정도는 플라즈마 방전 전력과 처리 시간에 의존하였다.