• 한국재료학회:학술대회논문집
• /
• 한국재료학회 2011년도 춘계학술발표대회
• /
• pp.1.1-1.1
• /
• 2011

Printed electronics based on the direct writing of solution processable functional materials have been of paramount interest and importance. In this talk, the synthesis of printable inorganic functional materials (conductors and semiconductors) for thin-film transistors (TFTs) and photovoltaic devices, device fabrication based on a printing technique, and specific characteristics of devices are presented. For printable conductor materials, Ag ink is designed to achieve the long-term dispersion stability and good adhesion property on a glass substrate, and Cu ink is sophisticatedly formulated to endow the oxidation stability in air and even aqueous solvent system. The both inks were successfully printed onto either polymer or glass substrate, exhibiting the superior conductivity comparable to that of bulk one. In addition, the organic thin-film transistor based on the printed metal source/drain electrode exhibits the electrical performance comparable to that of a transistor based on a vacuum deposited Au electrode. For printable amorphous oxide semiconductors (AOSs), I introduce the noble ways to resolve the critical problems, a high processing temperature above $400^{\circ}C$ and low mobility of AOSs annealed at a low temperature below $400^{\circ}C$. The dependency of TFT performances on the chemical structure of AOSs is compared and contrasted to clarify which factor should be considered to realize the low temperature annealed, high performance AOSs. For photovoltaic application, CI(G)S nanoparticle ink for solution processable high performance solar cells is presented. By overcoming the critical drawbacks of conventional solution processed CI(G)S absorber layers, the device quality dense CI(G)S layer is obtained, affording 7.3% efficiency CI(G)S photovoltaic device.

• 한국재료학회지
• /
• 제2권3호
• /
• pp.163-171
• /
• 1992

$TiO_2$가 5-50wt%첨가된 $SnO_2/TiO_2$ 후막형 감습소자를 스크린 프린팅 법을 이용하여 제조 하였다. 소자의 표면결정구조를 XRD, SEM 그리고 FTIR로 조사하였으며, 전기적 특성에 의한 후막소자의 감습특성을 측정하였다. $SnO_2/TiO_2$ 후막은 $TiO_2$ 결정상 보다 주로$(SnO^2){\cdot}6T$ 결정상으로 나타났으며, $1300^{\circ}C$에서 소결된 후막소자의 평균입경은 $2.0{\mu}m$이었다. 또한 $1300^{\circ}C$에서 소결된 10wt% $TiO_2$가 첨가된 $SnO_2/TiO_2$ 후막소자는 상대습도 20-90%에서 높은 감습특성을 나타내었다.

• 한국기계가공학회지
• /
• 제15권6호
• /
• pp.122-128
• /
• 2016

The Biosensor biosensor pattern was developed by via an EHD (electro-hydro-dynamics (EHD) patterning process that was performed under atmospheric pressure at room temperature in a single step. The drop diameter was smaller than nozzle diameter and applied high viscosity conductive ink was applied in the EHD patterning method to provide a clear advantage over the piezo and thermal inkjet printing techniques. The Biosensor's biosensor's micro electrode pattern was printed by via a continuous EHD patterning method using 3three- type types of control parameters parameter (input voltage, patterning speed, nozzle pressure). High viscosity (1000 cps) conductive ink with 75 wt% of silver nanoparticles was used for experimentation. The incremental result of impedance of biosensor impedance was measured between the antibody ($10ug{\mu}g/ml$) to spore (0.1 ng/ml, 10 ng/ml, and $1ug{\mu}g./ml$) reaction at frequency 493 MHz frequency.

• 한국의류산업학회지
• /
• 제17권6호
• /
• pp.988-995
• /
• 2015

Gaps between the upper edges of brassiere mold cups and the breasts are one of the most serious issues in realizing comfort wearing of commercial brassieres for small-breasted women. The surplus ease amounts causing the fit problem were measured from 3D wearing images of the small-breasted women's brassieres. The effect after the removing the surplus ease amounts from the upper edge of mold cup was approved by subjective wearing evaluation. Since the volume distribution of mold cup can also affect the wearing sensation of brassiere, the subjective wearing sensation was compared for two brassieres of different volume distributions, V_L, of which volume was concentrated at the lower cup, and V_C, which has the thickest part at the nipple. As the results, the suitable sensation for cup volume and the natural wearing silhouette could be accomplished by removing the surplus ease amounts from the upper edge of mold cup to reduce the gaps between brassieres and the breasts, which could be accomplished through an approach reducing the volume near the upper edge of mold brassiere cup and making the volume concentrated at the lower cup. These works provide a useful information on the design of the brassiere mold cups for small-breasted women. Moreover, modeling methods of 3D scan data and 3D printing technique for making more accurate mold cases used in this research can be helpful to develop and evaluate clothing products in future.

• 대한핵의학회지
• /
• 제3권2호
• /
• pp.55-63
• /
• 1969

In the past few years, scintigraphy has become increasingly important in clinical practice, and the use of a color-printing technique has permited a more accurate interpretation of the scan image. Our liver color scintigrams consist of 51 hepatomas, 35 liver cirrhosis, 22 liver abscessis, 10 hepatitis and other 13 cases of the liver diseases which were clinically arid pathologically diagnosed at Sevarance Hospital, Yonsei Univ., since Feb. 1969 through Sept. 1969. These scintigrams have been analized in terms of various pathologic morphology, such as size, shape, margin of the liver, distribution of radioactivity, and shape of the space occupying lesions. The results are as follows: 1. Enlargement of the liver was the most common finding in the diseased livers. The Rt. lobe enlargement was particularly prominent in the liver abscess. 2. Irregular distribution of radioactivity in the liver (so called mottling) was present in 78% of hepatoma, while it was seen only in 31% of liver abscesses. 3. Liver cirrhosis tends to show perihilar accumulation of the isotope (57%). 4. The deformity of the lower most angle of the Rt. lobe, and the Lt. lateral margin of the Lt. lobe was also impressive throughout the cases ($74{\sim}95%$ of all diseased livers). 5. The frequency of visualization of the spleen was influenced by the size of space occupying lesions and the amount of functioning liver. 6. Differentiation between the liver abscess and hepatoma seems to be possible on scintigram, when shape and margin of defect and patterns of distribution of radioactivity in the remaining liver are clearly demonstrated.

• 센서학회지
• /
• 제4권2호
• /
• pp.37-44
• /
• 1995

공침법을 이용하여 Ca 및 Pt 가 첨가된 $SnO_{2}$ 미세 분말을 제조하였다. 제조한 미세분말에 대해 TEM, XRD 및 BET 분석으로 결정크기 및 비표면적을 분석하였으며, 제조한 원료분말을 이용하여 스크린 인쇄법으로 후막형 가스 감지 소자를 제작하고, 그 특성과 탄화수소계가스에 대한 감지 특성을 조사하였다. 첨가된 Ca 및 Pt에 의해 하소와 소성의 열처리 과정 중에 $SnO_{2}$ 결정 성장이 억제되었으며, 탄화수소계가스에 대한 응답특성의 향상을 가져왔다. 한편, 소자의 전극으로써 Au 와 Pt를 사용하여 비교 분석하였는데, Au를 전극으로 사용할 경우에 Pt에 비해 가스 감응 특성 면에서 큰 저하를 가져왔다. 이는 Pt 전극도 $CH_{4}$의 산화에 기여했기 때문이다. Ca 및 Pt를 각각 0.1, 1 wt% 첨가한 $SnO_{2}$ 후막소자의 경우 2000 ppm의 $CH_{4}$에 대해 약 83%의 감도를 보였다.

• 전자공학회논문지SC
• /
• 제45권3호
• /
• pp.32-41
• /
• 2008

본 논문에서는 blu-ray 디스크 드라이버의 트랙킹 서보시스템에 대하여 플랜트와 제어기의 불확실성을 보상하는 견실비약성 $H^{\infty}$ 상태궤환 제어기 설계방법을 제안한다. 플랜트와 제어기의 불확실성을 매개변수화 선형행렬부등식(PLMI: parameterized linear matrix inequality)을 이용하여 구조화된 불확실성의 형태로 표현하며, Lyapunov 함수를 이용하여 구조적인 제어기의 이득섭동을 고려한 견실비약성 $H^{\infty}$ 상태궤환 제어기가 존재할 충분조건 및 제어기 설계방법을 PLMI의 형태로 제안한다. 또한, 완화기법(relaxation technique)을 통하여 PLMI를 유한개의 LMI의 형태로 변환하여 견실하고 최적화된 제어기 이득과 제어기 섭동 범위를 계산하고, 모의실험을 통해서 제시된 제어기의 타당성 및 견실성(robustness)과 비약성(non-fragility)을 검증한다.

• 복식
• /
• 제53권6호
• /
• pp.11-23
• /
• 2003

Japonese woodblock printing has been accepted with a great curiosity at first, and it has been called as 'Japonisme' or 'Japonaiserie' in which the school of Impressionism accepted the Japanese type of art and developed it in Europe. The term of Japonisme is the concept that does not refer to one style but to the taste for Japanese painting, craft, fashion and the like in Europe proved as the historical phenomenon through Japanese works. That is, it means every Japanese disposition including all artistic techniques and contents relating to Japanese tastes in Europe. Fashion of dress as Japanese expressed in European painting works not only symbolizes the 'modernity' expressive of the aspiration and nostalgia for Japan but presents the Japan of exotic taste as the inquisitive object of sexual interest. And the expressive method of the peculiar the beauty of the body was described in Japanese painting works because of the fashion characteristics that the frontal side of Japanese clothing was presented in a more decorative and formative way than its reverse side due to decorative design and belts. It could be found that this was introduced actively into the painting works of the impressionist school. This study attempts to discuss the expressive style including the pictorial style, technique and theme shown in the accommodating process of Japanese painting in the Impressionistic school and investigate the phenomenon of Japonisme that was conducted in the western Europe. Accordingly, this study attempts to find out that clothing takes an important place as the aesthetic category of one historical point in time by investigating the Japanese clothing of the times shown in impressionist painting works and that clothing forms the stylistic characteristics and formative characteristics of painting. It could be found that dress existed not only as the instrument capable of illustrating the aesthetic attitude or will of the human being as visual identity but as plastic art and became the prime mover for reinterpreting and changing the plastic style of art frontier.

• 한국재료학회지
• /
• 제11권4호
• /
• pp.272-277
• /
• 2001

WO$_3$에 NiO를 첨가하여 제조한 후막형 시편의 미세구조와 전기적 성질에 대해 연구하였다. NiO 첨가에 따른 WO$_3$의 결정립 성장이 억제되었고, 입도 분포도 균일하였으나 첨가량에 따른 결정립 크기 변화정도는 작았다. 산소 분압 감소로 WO$_3$의 전도성은 증가하였고, NiO 첨가에 의해 고용한계 이하에서는 전도성이 증가하였고, 이상에서는 전도성이 감소하였다. 온도 증가에 따라 외인성 (extrinsic) 구간에서는 전도성 변화가 적었고, 고온의 진성 (intrinsic) 구간에서는 전도도가 급격히 증가하였으며, 이들의 중간 온도에서는 산소흡착에 따라 전도도가 감소하였다.

• 대한기계학회논문집A
• /
• 제41권7호
• /
• pp.607-612
• /
• 2017

최근 다양한 분야에 적용되고 있는 적층 가공 기술(AM)은 복잡한 형상 제조 및 재료 비용 절감으로 인해 혁신적인 제품 생산 방법으로 각광을 받고 있다. 그 중에서도 압출적층조형(Fused Deposition Modeling, FDM) 공정을 통한 친환경 부품 제조는 의료 분야산업에서 많은 주목을 받고 있다. 따라서, 본 논문에서는 친환경 생분해성 재료인 Poly Lactic Acid(PLA)를 사용한 FDM 공정 실험을 수행하고 제작된 적층 시편에 대한 인장 시험을 적용하여 주요 FDM 공정 변수인 적층 두께, 적층 방향, 적층 충진량이 인장 시편의 기계적 성질에 미치는 영향을 정량적 및 정성적으로 분석하고 이를 극대화하는 각 공정 변수의 최적값을 도출하였다.