• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.255-256
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• 2007

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.73-74
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• 2008

• 한국고분자학회지:고분자과학과기술
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• 제16권6호
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• pp.799-806
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• 2005

• 한국고분자학회지:고분자과학과기술
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• 제26권3호
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• pp.215-220
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• 2015

• 한국고분자학회지:고분자과학과기술
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• 제26권3호
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• pp.221-225
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• 2015

• 폴리머
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• 제31권1호
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• pp.14-19
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• 2007

탈미네랄화된 골분(demineralized bone particle, DBP)은 골/연골 형성의 강력한 유도인자로 사용된다. 본 연구에서는 용매 캐스팅/염 추출법을 이용해 함량별 DBP와 PLGA가 하이브리드화된 다공성 지지체를 실제 디스크 형태와 유사하게 제조하였다. 제조된 지지체의 특성을 분석하기 위하여 다공도, 표면 젖음성 및 물 흡수성을 측정하였다. 디스크 세포인 섬유륜 및 수핵 세포는 토끼로부터 분리하여 제조된 지지체에 각각 파종한 후, 지지체를 재조합하여 배양하였다. 지지체에 파종된 디스크 세포의 생존율과 증식률은 MTT(3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium-bromide) 분석 방법을 이용하였고, 면역결핍 쥐의 피하에 삽입하여 이들의 디스크 조직 형성 정도를 확인하였다. 피하에 이식된 지지체를 적출하여 육안으로 관찰하고 모폴로지의 변화를 확인한 후, 조직을 파라핀으로 고정시켜 슬라이드를 제조하여 hematoxylin과 eosin 염색을 수행하였다. 천연/합성 하이브리드 담체로서의 DBP/PLGA 담체가 PLGA 단독으로 사용하였을 때와 비교하여 볼 때 디스크 조직의 형성이 우수하였으며, 특히 20, 40%의 DBP가 함유된 지지체가 세포의 성장과, 디스크 조직화에 유리함을 확인하였다.

• 복합신소재구조학회 논문집
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• 제4권4호
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• pp.1-8
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• 2013

Pile foundations constructed by the fiber reinforced polymer plastic piles have been used in coastal and oceanic regions in many countries. Generally, fiber reinforced polymer plastic piles are consisted of filament winding FRP which is used to wrap the outside of concrete pile to increase the axial load carrying capacity or pultruded FRP which is located in the core concrete to resist the bending moment arising due to eccentric loading. In this paper, the analytical procedures of hybrid concrete filled FRP tube flexural members are suggested based on the CFT design method. Moreover, the analytical results are compared with the experimental results to obtained by the previous researches. The results of comparison analyses are performed to estimate the accuracy of the analytical procedure for hybrid FRP-concrete composite compression test, members under eccentrical loading.

• Korean Membrane Journal
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• 제6권1호
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• pp.44-54
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• 2004

Organic-inorganic composite membranes based on sulfonated poly(phthalazinone ether sulfone) (sPPES)/silica hybrid were prepared using the sol-gel process under acidic conditions. The sulfonation of PPES with concentrated sulfuric acid as sulfonation agent was carried out to prepare proton exchange membrane material. The behaviors of the proton conductivity and methanol permeability are depended on the sulfonation time (5-100 hr). The hybrid membranes composed of highly sulfonated PPES (IEC value: 1.42 meq./g) and silica were fabricated from different silica content (5-20 wt%) in order to achieve desirable proton conductivity and methanol permeability demanded for fuel cell applications. The silica particles within membranes were used for the purpose of blocking excessive methanol cross-over and for forming the path way to transport of the proton due to absorbing water molecules with ≡SiOH on silica. The presence of silica particles in the organic polymer matrix results in hybrid membranes with reduced methanol permeability and improved proton conductivity.

• Advances in materials Research
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• 제5권2호
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• pp.121-130
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• 2016

In an attempt to reach a balance of performances in homo-polypropylene based system, the effects of single and hybrid reinforcements inclusions comprising calcium carbonate nanoparticles (2, 4 and 6 phc) and glass fibers (10 wt.%) on the mechanical and thermal properties were investigated. Different samples were prepared by employing twin-screw extruder and injection molding machine. In morphological studies, the uniform distribution of glass fibers in PP matrix, relative adhesion between glass fibers and polymer, and existence of nanoparticles in polymer matrix were observed. $PP/CaCO_3$ (6 phc) as compared to pure PP and PP/GF had superior tensile and flexural strengths, impact resistance and deformation temperature under load (DTUL). $PP/GF/CaCO_3$ (6 phc) composite displayed comparable tensile and flexural strengths and impact resistance to neat PP, while its tensile and flexural moduli and deformation temperature under load (DTUL) were 436%, 99% and $26^{\circ}C$greater respectively. The maximum impact resistance was observed in $PP/CaCO_3$(6 phc). The highest DTUL was perceived in PP hybrid nanocomposite containing 10 wt.% glass fiber and 4 phc $CaCO_3$ nanoparticle.

• 전기학회논문지
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• 제62권1호
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• pp.63-69
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• 2013

In recent years, technology for storing a preliminary power or a surplus of photovoltaic energy is required. This technique, as well as store a preliminary energy and improve the reliability of the gird safety. This system can plan a efficient power generation through the flexibility of the power supply from the perspective of not only provider but also user. Accordingly, the realization of the smart grid can be expected. This paper proposes a hybrid PCS using a photovoltaic and a lithium-polymer battery with the characteristics of high density energy. The main energy source of a hybrid PCS is a photovoltaic, grid and the auxiliary energy source is a lithium-polymer battery. The operation of a proposed system in this paper is verified with simulation and experimental results.