• 한국식품영양과학회지
• /
• 제42권3호
• /
• pp.415-420
• /
• 2013

쌀의 기능성 소재화 및 새로운 용도 개발 연구의 일환으로, 제2형 당뇨환자의 혈당을 조절할 수 있는 인슐린 기능 개선 소재로 알려져 있는 cyclo histidine-proline(CHP) 함유 대두가수분해물(SHC)을 쌀에 함유시켜 신규 기능성 쌀을 개발하고자 하였다. 이를 위해 흡수 및 분무 코팅에 의해 쌀의 가공 중 첨가 기능성 성분인 CHP 함유된 대두가수분해물의 소실을 억제하는 기능성 성분 강화 코팅 쌀의 제조공정을 검토하였다. 흡수 코팅법은 CHP 함유 대두가수분해물의 농도 증가에 따라 흡수저해가 일어나 흡수율이 낮게 나타나므로 적합하지 못하였다. 반면 methylcellulose 폴리머를 사용한 분무 코팅에 의하여 제조된 코팅 쌀은 다소의 균열 발생 및 미황색화가 관찰되었으나 외관 형태의 큰 변화는 관찰되지 않았다. 특히, 수화양상 및 수화속도가 원료 쌀에 비하여 높게 나타났으며, 코팅과정 중의 건조에 의한 호화 등은 관찰되지 않았다. 따라서 5%(w/v)의 CHP 함유 대두가수분해물을 함유한 1%(w/v) methylcellulose 폴리머를 보호제로 사용하여 분무 코팅한 후 건조하여 CHP 함유 대두가수분해물을 기능성 성분으로 하는 기능성 코팅 쌀을 제조하는 공정을 확립하였다.

• Journal of Welding and Joining
• /
• 제19권2호
• /
• pp.221-227
• /
• 2001

Based on the principle of complementary energy, an analytical method is developed which focuses on the end effects for determining thermal stress distributions in a three-layered beam. This method gives the stress distributions which completely satisfy the stress-free boundary conditions. A numerical example is given in order to verify this method. The results show that the present analytical solutions have the values of stress in excellent agreement with the solutions derived by other investigators. Using this method, the effects of the thickness of bond coat on the thermal stresses of a typical sprayed thermal barrier coating, which consists of IN738LC substrate, MCrAIY bond coat and ZrO$_2$-8wt%Y$_2$O$_3$top coat, were investigated.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 추계학술대회 논문집 전기물성,응용부문
• /
• pp.42-44
• /
• 2003

The paper presents the method and apparatus for conformal photoresist spray coating on the 3D structured substrate. The system consists of a high-temperature-rotational chuck, ultrasonic spray nozzle module, angle control module and nozzle moving module. The coating uniformity is acquired by controlling the moving speed of the ultrasonic spray nozzle across the substrate which is rotated constantly. To coat the photoresist conformally the spray angle of the nozzle and the temperature of the substrate are controlled during spray coating. The rotational chuck can be heated up by hot air or $N_2$. The photoresist (AZ1512) has been coated on the 3D structured wafer by spray coating system and the characteristics have been evaluated.

• Journal of Ceramic Processing Research
• /
• 제13권spc2호
• /
• pp.363-367
• /
• 2012

DLC (diamond liked carbon) coating of the tungsten carbide (WC) alloy core surface for molding a glass aspheric lens improves the quality of glass lens and the molding core and is characterized by high hardness, high elasticity, abrasion resistance and chemical stability. In this study, the effect of DLC coating of a thin film by means of the filtered AIP (arc ion plating) technique was examined on Ra and shape of the coated surface. Roughness before and after DLC coating was measured and the result showed that the roughness was improved after coating as compared to before coating. It was observed that DLC coating of the WC alloy core surface for molding had an effect on improving the roughness and shape of the core surface. It is considered that this will have an effect on improving abrasion resistance and the service life of the core surface.

• 한국정밀공학회지
• /
• 제30권6호
• /
• pp.589-595
• /
• 2013

Solution processed conjugated molecules enable to manufacture various electronic devices by unconventional and cost effective patterning methods as screen or gravure printing. Spin-coating is the most popularly used method to form conjugated polymeric film for various electronic devices. The coating method has certain disadvantages such as a large amount of unwanted wastes, difficulty forming a film with a large area, and impossible to apply roll-to-roll manufacturing. We present here a promising alternative coating method, bar-coating for conjugated polymer film and OLED with the bar coated light emitting layer. In this papers, we show atomic force microscope images of spin- and bar-coated Poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT) films on substrate. The bar-coated film showed a slight lower RMS roughness (1.058 [nm]) than spin-coated film (1.767 [nm]). It means the bar-coating is suitable method to form light emitting layers in OLEDs. By using bar-coating process, an OLED obtained with 4.7 [cd/A] in maximum current efficiency.

• 한국한의학연구원논문집
• /
• 제13권3호
• /
• pp.119-124
• /
• 2007

Introduction: In Oriental medicine, the status of tongue is the important indicator to diagnose one's health, because it represents physiological and clinicopathological changes of inner parts of the body. The method of tongue diagnosis is not only convenient but also non-invasive, so tongue diagnosis is most widely used in Oriental medicine. By the way, since tongue diagnosis is affected by examination circumstances a lot, its performance depends on a light source, degrees of an angle, a medical doctor's condition etc. Therefore, it is not easy to make an objective and standardized tongue diagnosis. In order to solve this problem, in this study, we tried to design a discriminant function for thick and thin coating with color vectors of preprocessed image. Method: 52 subjects, who were diagnosed as white-coated tongue, were involved. Among them, 45 subjects diagnosed as thin coating and 7 subjects diagnosed as thick coating by oriental medical doctors, and then their tongue images were obtained from a digital tongue diagnosis system. Using those acquired tongue images, we implemented two steps: Preprocessing and image analyzing. The preprocessing part of this method includes histogram equalization and histogram stretching at each color component, especially, intensity and saturation. It makes the difference between tongue substance and tongue coating was more visible, so that we can separate tongue coating easily. Next part, we analyzed the characteristic of color values and found the threshold to divide tongue area into coating area. Then, from tongue coating image, it is possible to extract the variables that were important to classify thick and thin coating. Result : By statistical analysis, two significant vectors, associated with G, were found, which were able to describe the difference between thick and thin coating very well. Using these two variables, we designed the discriminant function for coating classification and examined its performance. As a result, the overall accuracy of thick and thin coating classification was 92.3%. Discussion : From the result, we can expect that the discriminant function is applicable to other coatings in a similar way. Also, it can be used to make an objective and standardized diagnosis.

• 한국산학기술학회논문지
• /
• 제1권1호
• /
• pp.49-54
• /
• 2000

Calorizing(또는 Aluminizing)에서 코팅분말의 입자크기 및 코팅온도가 금속표면에 형성된 코팅 층의 특성에 미치는 영향을 SEM과 EDXS를 사용하여 자세히 고찰하였다. 코팅분말은 입자크기별로 3단계로 분리하여 사용하였으며 코팅온도는 950℃ 와 980℃로 변화하였다. Calorizing 처리는 팩 세멘테이션 방법을 사용하여 아르곤 분위기에서 5시간 동안 행하였다. Calorizing 처리 결과 코팅분말의 입자크기가 감소하고 코팅온도가 증가할수록 코팅 층의 두께와 코팅 층에서의 알루미늄의 함량이 증가하였다. 또한 오팅분말의 크기가 작은 경우(150-200 mesh) 코팅 층 표면에 형성된 기공이 현저히 감소하였고 표면의 균일성도 우수함을 알 수 있었다.

• 반도체디스플레이기술학회지
• /
• 제16권4호
• /
• pp.91-96
• /
• 2017

In this computational study of optical fiber manufacturing, WOW (wet-on-wet) double coating process on freshly drawn glass fiber has been numerical modelled and simulated using a simplified geometry of typical optical fiber coating apparatus. The numerical domain includes primary and secondary coating dies along with secondary coating cup and the interface between primary and secondary coating liquids are investigated using level set method. Coating liquid viscosity is an important parameter and its dependence on temperature is also considered. Since there would be possibility for pressure and temperature of primary coating liquid to be increased substantially at high fiber drawing speed, the effects of increased pressure and temperature of primary coating liquid are examined on flow patterns of coating liquids in secondary coating cup. In case that both pressure and temperature of primary coating liquid are high enough, liquid interface becomes noticeably unstable and this flow instability could adversely affect the uniform coatings and final quality of produced optical fiber.

• 펄프종이기술
• /
• 제31권4호
• /
• pp.16-22
• /
• 1999

The quantitative analysis of SB latex contents in coating color and coated paper was investigated with FT/Raman spectroscopy. From the measured FT/IR and FT/Ramon spectra, the peaks of coating color were compared with those of each compoents . Calibration curves were obtained by the area of latex peaks and PLS method of QuantIR program. The relation of predicted values in PLS method and actual values in coating mixtures and coating layer was examined. The components of coating layer in coated paper were investigated by EDS , X-mapping and SEM, The contents of latex in z-direction were calculated in the coating layer of unknown coated paper. The latex concentration measurements of Top layer and Pre layer in double coated paper show that each layer has different value. In single coated paper, it is clear that the latex concentration is highest at the surface and decreases with an increase of depth. From those results it is indicated that the latex migrates to the coated surface. The result of this study may be applied to the binder migration study and the quality control in paper mill.

• 한국해양공학회지
• /
• 제10권2호
• /
• pp.88-97
• /
• 1996

The pupose of this study is to improve the mechanical properies and to evaluate the residual stresses of flame-sprayed Alumina ceramic coating layer. The first work in this study is to investigate the effects of strengthening heat treatments on the mechanical properties of coating layer. Strengthening heat treatments for sprayed specimens were carried out in vaccum furnace. The mechanical properties such as microhardness, thermal shock resistance, adhesive strength and erosion resistance were tested for the sprayed specimens after strengthening heat treatments. And it was clear that the mechanical properties of coating layer were much improved by strengthening heat treatments. The second work in this study is to evalute the residual stresses in coating lsyer by numerical analysis. FDM and FEM were used to analyze temperature distribution and residul stresses in coating layer. It was proved that are tensile stresses in coating layer and that residual stresses can be controlled by the appropriate selection of the spraying parameters such as preheat temperature, coating thickness and bond coat thickness.