• ETRI Journal
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• 제42권1호
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• pp.129-137
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• 2020

All-solid-state batteries are promising energy storage devices in which high-energy-density and superior safety can be obtained by efficient cell design and the use of nonflammable solid electrolytes, respectively. This paper presents a systematic study of experimental factors that affect the electrochemical performance of all-solid-state batteries. The morphological changes in composite electrodes fabricated using different mixing speeds are carefully observed, and the corresponding electrochemical performances are evaluated in symmetric cell and half-cell configurations. We also investigate the effect of the composite electrode thickness at different charge/discharge rates for the realization of all-solid-state batteries with high-energy-density. The results of this investigation confirm a consistent relationship between the cell capacity and the ionic resistance within the composite electrodes. Finally, a concentration-gradient composite electrode design is presented for enhanced power density in thick composite electrodes; it provides a promising route to improving the cell performance simply by composite electrode design.

• 유기물자원화
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• 제15권2호
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• pp.109-117
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• 2007

침출수의 수량 및 수질변화를 평가하기 위하여 세 종류(소각재 100%, 소각재 70%+일반생활폐기물 30%, 생활폐기물 100%)의 모형매립조를 실제 기상조건하에서 운영하였다. 실험결과, 누적 침출수 발생률이 모형매립조 A와 B가 모형매립조 C보다 높은 것으로 나타났다. 모형매립조 A는 pH가 pH 9~11의 범위였으나 시간이 경과하면서 중성으로 점차 변하였다. 염소이온은 소각재를 매립한 모형매립조 A와 B가 높은 것으로 나타났으나 모형매립조 C의 경우 낮게 나타났다. 생활폐기물을 충전한 모형매립조 C의 경우 침출수내의 유기물 농도가 다른 모형매립조보다 높게 나타났다.

• 융합정보논문지
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• 제10권12호
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• pp.236-244
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• 2020

본 연구에서는 하천실험센터에서 부유 물질 실험을 수행하여 부유 물질의 거동 및 확산을 관찰하고 이를 입자분산모형을 통하여 그 이동을 구현하고자 하였다. 규사를 물과 믹서기를 이용하여 혼합한 후 실규모 크기의 실험수로에 인위적으로 투입하고 레이저부유사측정기(LISST)를 이용하여 부유 물질의 농도를 측정하였다. 실험에서 드론 이미지 및 부유사 측정기 관측 데이터와 입자 분산 모형을 통해 부유 물질의 거동을 모의하여 비교한 결과, 비교적 실험 결과가 구현이 잘 된 것을 확인할 수 있었다. 이를 통하여 입자 분산 모형의 적용성은 물론, 높은 강우량으로 인한 유량 발생 시 부유 물질 예측 활용성을 기대할 수 있게 되었다.

• Journal of Pharmaceutical Investigation
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• 제26권2호
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• pp.125-135
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• 1996

Solid lipid nanoparticles(SLN) are particulate systems for parenteral drug administration and suitable for controlled release. SLN were prepared by homogenization process. Dispersion at increased temperature (molten lipid) was performed to yield SLN loaded with lipophilic drugs. Tetracaine base, lidocaine base, prednisolone, methyltestosterone and ethinylestradiol were used as model drugs to access the loading capacity and to study the release behavior. To investigate production parameters(lipids, surfactant concentration, homogenizing rpm) in the formation of SLN, particle size was performed by laser diffraction analysis. The mean particle size of SLN with stearic acid or trilaurin was below 1 micron. By decreasing the particle size and increasing the surfactant concentration, the release rate was increased especially in the case of highly lipophilic drug loaded SLN. Methyltestosterone or ethinylestradiol loaded SLN showed a distinctly prolonged release over a few days.

• 상하수도학회지
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• 제8권3호
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• pp.1-8
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• 1994

In the general process of design for aerobic digestion, the design for field plant of which inflow pattern is continuous inflow is performed using the results from lab scale batch reactor. However, the recent researchers reported that the general designs were performed as over-estimated, Therefore, in this study, laboratory batch experiments were carried out at $20^{\circ}C$ and pH 7.5 on the aerobic digestion of waste activated sludge at different solid levels. This treatise could consider the negligence about effective digestion periods the usage of VSS as solid concentration, and the effect of initial solid concentration of solid degration rate coefficient($k_d$) as reasons of the overestimated design, and showed the scheme of how to design for aerobic digestion from batch experiment.

• 한국분무공학회지
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• 제12권3호
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• pp.138-145
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• 2007

In the present work, the breakup mechanism of highly viscous epoxy paints discharged from a fan spray nozzle was examined experimentally. The paints tested were non-Newtonian fluids, composed of epoxy resin, solid particles and other additives. The paint spray discharged from the nozzle was visualized and recorded using a digital camera with back illumination. Due to presence of the solid particles, perforation of liquid sheet was observed in most cases, even at low-Reynolds number conditions (Re < 15,000) where the aerodynamic-wave breakup mode is used to be dominant for pure liquids. However, with the increase of the particle concentration, the sheet became longer and the thickness at breakup became thinner to some extent. This is because, with higher concentration of solid particles, the stabilizing effect by the viscosity increase predominates over the destabilizing effect by perforation.

• 멤브레인
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• 제19권4호
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• pp.268-276
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• 2009

본 연구에서는 기존의 중량법과 광산란법과는 원리와 기술이 다른 입도별 부유물질 측정용 분리막 모듈 및 장치를 개발하기 위한 원리를 수립하기 위한 기초 자료를 확립하고자 하였다. 이러한 목적을 위하여, 이산화규소 및 덱스트란(dextran), 카올린(kaolin), PEG (polyethylene glycol) 부유용액을 대상으로 유리섬유 여과지 GF/C와 GF/A를 분리막 모듈에 장착하여 여과시키면서, 디지털 압력계를 사용하여 막간압력차(TMP, Trans-membrane pressure) 변화를 측정하였다. 모사용액의 농도와 TMP 변화율 기울기의 상관관계식을 TMP 변화 실험 결과로부터 구하여, TMP 변화 기울기로부터 시료의 농도를 예측할 수 있도록 하였다.

• 한국응용과학기술학회지
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• 제27권4호
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• pp.437-444
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• 2010

Dry Process(natural drying, hot-air drying, oil fry drying), optimized mixture ratio and the condition of carbonization was carried out in order to improve the product durability develop eco-friendly solid fuel mixing food waste and paper sludge. As a result of the experiment, oil fry drying process was the fastest method for drying food waste and paper sludge mixture that contains 80% water inside, and the optimized mixture ratio to minimize the generating concentration of chlorine gas against caloric value of mixture ratio was 7:3. Additionally proper temperature of product carbonization was about $200^{\circ}C$ and shown increasing product durability through the carbonization. Therefore, the pelletized solid fuel be shaped diameter around 0.5cm, length 2cm under which was pulverized and molded using 7:3 mixture of food waste, and paper sludge was the eco-friendly solid fuel possible to be industrialized which is consist of chlorine concentration of below 2.0wt% and the lowest caloric value of over 5,000kcal/kg. In conclusion, this developing manufacturing process of the solid fuel can be interpreted to contribute alternative energy development in accordance with low carbon and green growth era.

• 한국산업융합학회 논문집
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• 제24권6_2호
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• pp.737-744
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• 2021

An investigation is conducted to study a solid-liquid mixture vertically upward hydraulic transport of solid particles by non-Newtonian fluids in the Mud system. Rheology of particulate suspensions in viscoelastic fluids is of importance in many applications such as particle removal from surfaces, transport of proppants in fractured reservoir and cleaning of drilling holes, etc. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular velocities varied from 0.4 m/s to 1.2 m/s. The mud systems which were utilized included aqueous solution of sodium carboxymethyl cellulose (CMC) solutions. Main parameters considered in the study were inner-pipe rotary speed, fluid flow regime and particle injection rate. Solid volumetric concentration and pressure drops were measured for the various parameters such as inclination angle, flow rate, and rotational speed of inner cylinder.

• 한국식품영양과학회지
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• 제22권3호
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• pp.317-322
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• 1993

배추의 염절임(5$0^{\circ}C$, 25% 소금용액)및 탈염(5$0^{\circ}C$, 증류수)과정중 침지시간에 따른 물질이동을 수분흡수 또는 유출, 소금유출 또는 흡수 및 환원당유출로써 조사하였다. 염절임 과정중 수분유출과 소금흡수는 초기 6시간 침지과정에서 빠르게 이루어진 후 증가현상이 둔화되었다. 24시간 염절임 과정 후 초기 100g 배추무게당 수분유출과 소금흡수는 각각 33.35g과 6.26g이었다. 염절임과정중 수분함량은 94.29%에서 83.11%로 줄어들었다. 환원당농도 역시 29.2mg/$m\ell$에서 6.5mg/$m\ell$로 낮아졌으며, 침지시간(hr) 의 평방근을 이용한 직선식은 Y=30.1841-5.0269√t이었다. 24시간 염절임 한후 탈염과정에서의 수분흡수와 소금유출은 초기 4시간 침지과정에서 빠르게 이루어진 후 직선적으로 계속적인 증가현상을 나타내었다. 12시간 탈염과정 후 초기 100g배추 무게당 수분흡수는 20.82g이 었으며, 소금유출은 9.14g이었다. 탈염과정에서의 소금유출이 염절임과정의 소금흡수보다 높은 이유는 염절임 및 탈염과정에서 배추의 고형분 유출에 기인된 것이었다. 12시간의 탈염공정으로 김치 제조시 배추의 적정 소금농도인 3%로 낮출수 있었다. 이때의 환원당농도는 1.6mg/$m\ell$로 낮아졌으며, 침지시간의 평방근을 이용한 직선식은 Y=6.7854-1.5992√t로써 염절임 공정의 기울기값 (-5.0269)과 비교할때 탈염공정에서의 환원당 겉보기 유출속도는 낮았다.