• 한국결정학회:학술대회논문집
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• 한국결정학회 2007년도 추계학술연구발표회 및 정기총회
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• pp.7-7
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• 2007

• 한국진공학회:학술대회논문집
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• 한국진공학회 2007년도 제32회 학술대회 초록집
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• pp.132-132
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• 2007

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2006년도 춘계학술발표회 초록집
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• pp.121-121
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• 2006

• 한국진공학회:학술대회논문집
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• 한국진공학회 2006년도 제30회 학술논문발표회 초록집
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• pp.136-136
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• 2006

• 폴리머
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• 제38권1호
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• pp.54-61
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• 2014

Bombyx mori silk fibroin(SF)과 블렌드 필름을 만들기 위하여 키토산에 1,3-propanesultone을 반응시켜 수용성 sulfobetaine chitosan(SCs)을 제조하였다. 여러 가지 비율의 SF/SCs 블렌드 필름을 B. mori SF와 SCs의 수용액을 혼합하여 제조하였다. 수용액으로부터 얻어진 SF/SCs 블렌드 필름의 구조와 형태 변화는 분광학적 및 열적 분석을 통해 규명하였다. SF와 SCs의 혼합 비율에 따른 인공 피부나 화상치료 목적의 비이오재료로서의 물리적 및 기계적 성질에 미치는 영향을 조사하였다. X-선 분석으로 두 생체고분자 사이에 좋은 친화성을 보여주고 있음을 알 수 있었으며 기계적 성질도 SCs의 함량이 증가하면 크게 증가하였다. $37^{\circ}C$에서 phosphate buffered saline solution 용액 중에서 in vitro 분해 실험을 8주 동안 시행한 결과 46.4%가 분해됨을 알 수 있었다. MC3T3-E1 세포에 의한 독성 실험 결과 무독성을 나타내 주었으며, 3일의 배양 후 SF/SCs 필름의 상대 세포 수는 최적화된 tissue culture plastic보다 약간 낮게 나타남을 알 수 있었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.627-628
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• 2008

We have studied the optical performance of flexible polymer network liquid crystal (PNLC) films at various bending states. Different measurement setups, wide and narrow opening angles of detector, were used to collect scatting light of PNLC films. The optical and dynamic properties of bent PNLC implied the change of LC domains.

• 한국세라믹학회지
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• 제43권3호
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• pp.185-192
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• 2006

The effects of annealing on structural and electrical properties of ITO/PES (Indium Tin Oxide/Polyethersulfone) films was investigated. Amorphous ITO thin films were grown on plastic substrates, PES using low temperature DC magnetron sputtering. Various post annealing techniques were attempted to research variations of microstructure and electrical properties: i) conventional thermal annealing, ii) excimer laser annealing, iii) UV irradiation. The electrical properties were obtained using Hall effect measurements and DC 4-point resistance measurement. The microstructural features were characterized by FESEM, XRD, Raman spectroscopy in terms of morphology and crystallinity. Optimized UV treatment exhibits the enhanced conductivity and crystallinity, compared to those of conventional thermal annealing.

• 소성∙가공
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• 제13권8호
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• pp.731-737
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• 2004

Mechanical properties such as Young's modulus and hardness of thin film in coated steel are difficult to determine by nano-indentation from the conventional analysis using the load-displacement curve. Therefore, an analysis of the nano-indentation loading-unloading curve was used to determine the Young's modulus, hardness. A new method is recently being developed for elastic-plastic properties of materials from nano-indentation. Elastic modulus of the thin films shows relatively small influence whereas yield strength is found to have significant effect on measured data. The load-displacement curves of material tested with a Berkovich indenter and nano-indentation continuous stiffness method is used to measure the modulus and hardness through thin films, and then these are computed using the analysis procedure. The developed neural networks apply also to obtain reliable mechanical properties.

• Tribology and Lubricants
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• 제20권3호
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• pp.125-131
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• 2004

Nano-wear behavior of amorphous carbon films was studied by Atomic Force Microscopy. The a-C films are deposited on Si(100) substrate by DC magnetron sputtering method. The influences of different surface roughness on the nano-wear are investigated. Nano-wear tests were carried out using a very sharp diamond coated tip. Its spring constant was 1.6 N/m and radius of curvature was 110 nm. Normal force used in the wear tests ranged 0 to 400 nN. It was found that surface depression occurred during scratching because of plastic deformation and abrasive wear (cutting St ploughing). Wear depth increased linearly with normal force. Changing the surface roughness variables according to the bias pulse control, the less surface roughness decreased the wear depth. The thickness did not affect the wear resistance.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.732-734
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• 1998

Metal thin films such as aluminum have been used as interconnects in semiconductor device. Recently, these materials are applied to structural materials in microsensors and microactuators. In this study, we evaluate deformation and strength behavior of aluminum alloy film. Three layer model for thermal deformation of multilayered thin film material is introduced and applied to Si/Al(1%Si)/$SiO_2$ system. Based on beam bending theory and concept of bending strain. elastic and elastic/plastic thermal deformation behaviors of multilayered materials can be estimated. In the case of plastic deformation of ductile layer, strain rate equations based on deformation mechanism map are employed for describe the stress relaxation effect. To experimentally examine deformation of multilayered thin film materials, in-situ laser scanning method is used to measure curvature of specimens during heating and cooling. The thickness of $SiO_2$ layer is varied to estimate third-layer effect of thermal deformation of metal films, and its effect on deformation behavior are discussed.