• Journal of the Korean Recycled Construction Resources Institute
• /
• v.1 no.3
• /
• pp.219-224
• /
• 2013

In this study, the inorganic insulating material was fabricated with quartzite, ordinary portland cement(OPC), lime and anhydrous gypsum. After characteristic analysis of slurry, the optimum mixing ratio was derived with different $CaO/SiO_2$ mole ratio. Based on derived mixing ratio, the inorganic insulating material was fabricated at different water content and hydrothermal synthesis conditions. Specific gravity was $0.26g/cm^3$, compressive strength was 0.4 MPa, and thermal conductivity was 0.064 W/mK. This properties were enhanced performance of conventional ALC (Autoclaved Lightweight Concrete). And it can replace organic insulation with harmless inorganic insulation through continues research and development.

• Journal of the Society of Cosmetic Scientists of Korea
• /
• v.30 no.2
• /
• pp.173-180
• /
• 2004

Nano sized ZnO particle as 20-30nm applies for material, pigments, rubber additives, gas sensors, varistors, fluorescent substance as well as new material such as photo-catalyst, sensitizer, fluorescent material. ZnO with a particle size in the range 20-30nm has provided to be an excellent UV blocking material in the cosmetics industry, which can be used in sunscreen product to enhance the sun protection factor and natural makeup effect. But pure ZnO particles application limits for getting worse wearing feeling. We make high-functional inorganic-composite that coated with nano-ZnO on the plate-type particle such as sericite, boron nitride and bismuthoxychloride. In this experiment, we synthesized composite powder using hydrothermal precipitation method. The starting material was ZnCl$_2$ Precipitation materials were used hexamethylenetetramine(HMT) and urea. We make an experiment with changing as synthesis factors that are concentrations of starting material, precipitation materials, nuclear formation material, reaction time, and reaction temperature. We analyzed composite powder's shape, crystallization and UV-blocking ability with FE-SEM, XRD, FT-IR, TGA-DTA, In vitro SPF test. The user test was conducted by product's formulator. In the results of this study, nanometer sized ZnD was coated regardless of the type of plate-powder at fixed condition range. When the coated plate-powders were applied in pressed powder product, the glaze of powder itself decreased, but natural make-up effect, spreadability, and adhesionability were increased.

• Proceedings of the Membrane Society of Korea Conference
• /
• 1992.04a
• /
• pp.33-34
• /
• 1992

현재 이용되는 막들은 대부분 유기계 혹은 고분자계로 열적인 안정성이 적고 내약품성이 낮다. 그래서 본 실험에서는 내열, 내약품성이 우수한 무기기와 유기기를 조합하여 복합막을 제조하려 시도하였다. 이때 유-무기 복합상의 반응은 졸-겔 법을 이용하였는데 이 졸-겔 법이란 출발물질인 금속알콕사이드를 용액상에서 가수분해하여 졸을 얻고 축합반응을 통해 겔을 형성하여 무기고분자를 제조하거나 소결하여 필름, 분말, 섬유상, 괴상 등의 다양한 형태로 산화물을 제조하는 공정이다. 이는 분자적 차원에서 혼합하여 반응하므로 산화물간의 반응보다 반응성의 입장에서 훨씬 유리하며 또한 용액상에서 저온반응 하므로 기존에는 유기-무기기를 조합하는데 존재하는 문제를 해결 할 수 있다.

• Ceramist
• /
• v.20 no.2
• /
• pp.18-24
• /
• 2017

• Cement
• /
• s.112
• /
• pp.21-29
• /
• 1988

• Proceedings of the Korean Fiber Society Conference
• /
• 1995.10a
• /
• pp.92-92
• /
• 1995

• Proceedings of the Korean Magnestics Society Conference
• /
• 2002.12a
• /
• pp.38-39
• /
• 2002

일반적인 세라믹스 분말 합성방법으로서 고상법과 침전법 등은 성분 원소들간의 균일한 혼합이 어렵고, 대부분 최종 생성물의 합성 온도가 높아서 다성분계에 대하여 단일 상을 유지하면서 미세한 분말을 얻기가 힘들다. 그러나, 최근 들어 이러한 단점을 보완하기 위한 방법으로서 비정질 citrate법, 무기 금속염을 이용한 sol-gel법 등과 같이 비교적 공정이 단순하면서 입도 분포가 좁고 재현성이 우수한 구형의 초미립 또는 나노 분말의 제조에 적합한 방법들이 많이 연구되고 있다[1]. (중략)

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2010.05a
• /
• pp.57.1-57.1
• /
• 2010

레이저 색소 분자간의 회합을 막음으로써 높은 레이저 효율을 갖는 고체 색소 레이저를 제조하기 위해 레이저 색소인 DCM을 유-무기 하이브리드 재료에 화학적으로 결합시켰다. 수산화기를 기능기로 갖는 DCM을 합성하여 이를 솔-젤반응의 전구체로 활용하였다. 유기실란을 DCM과 함께 솔-젤반응을 시킴으로써 DCM이 결합된 유무기 하이브리드 재료를 제조하였다. DCM이 결합된 유-무기 하이브리드 재료는 유기물과 무기물의 특성을 각각 갖고 있기 때문에 용액공정을 통해 고체 색소 레이저를 단시간에 제작할 수가 있을 뿐만 아니라 열적 및 광학적으로 우수한 특성을 보여주었다. Nd:YAG 레이저를 여기광으로 이용하여 DCM이 결합된 유-무기 하이브리드 재료의 레이저 효율을 측정하여 DCM을 유기용매에 녹인 색소 레이저의 레이저 효율과 비교하였다. DCM이 결합된 유-무기 하이브리드 재료는 DCM의 농도가 높아질 수록 유기용매를 이용한 색소 레이저에 비해서 더 높은 레이저 효율을 가지는 것을 관찰하였다. 이는 DCM이 결합된 유-무기 하이브리드 재료에 각각의 DCM 분자가 실록산 망목구조와 화학적으로 결합이 되어있기 때문에 하이브리드 재료에 안정적으로 존재할 수 있게 되고 망목구조에 둘러쌓여 분자간의 회합이 방지되는 효과를 가지게 되기 때문이다.

• Journal of Conservation Science
• /
• v.25 no.1
• /
• pp.17-24
• /
• 2009

The feasibility of the geopolymer as a cultural asset restoration material was studied by investigating compressive strength and chromaticity change. Metakaolin that was synthesized by calcination of the kaolin at $750^{\circ}C$ for 6 hours was used as a geopolymeric starting material. Kaolin lost its crystallinity and changed into non-crystalline phase during calcination. NaOH solution and water glass were used as an initiator for the geopolymeric reaction. As the concentration of NaOH solution and water glass increased the compressive strength increased. When alumina was substituted with metakaolin, the compressive strength decreased at a small amount of alumina, but increased at a large substitution. For the most composition of geopolymers, the change of chroma values remained within the limit of slight variation after exposure to sunlight for 8 and 100 days. However, even small amount of organic pigment addition increased chroma values of metakaoline. It was shown that geopolymer had excellent chroma value change over epoxy resins.

• Journal of the Korea Society for Simulation
• /
• v.19 no.4
• /
• pp.291-299
• /
• 2010

As recent advances in science, technology and performance requirements of the weapons system are getting highly diversified and complex, the performance requirements also get stringent and strict. Moreover, the weapons system should be intimately connected with other systems such as watchdog system, command and control system, C4I system, etc. However, a tremendous amount of time, cost and risk being spent to acquire new weapons system, and not being diminished compared to the rapid pace of its development speed. Defense Modeling and Simulation(M&S) comes into the spotlight as an alternative to overcoming these difficulties as well as constraints. In this paper, we propose the development process of virtual test framework based on the synthetic environment as a tool to analyze the effectiveness of the weapons system of underwater engagement model. To prove the proposed concept, we develop the test-bed of virtual test using Delta3D simulation engine, which is open source S/W. We also design the High Level Architecture and Real-time Infrastructure(HLA/RTI) based Federation for the interoperation with heterogeneous simulators. The significance of the study entails (1)the rapid and easy development of simulation tools that are customized for the Korean Theater of War; (2)the federation of environmental entities and the moving equations of the combat entities to manifest a realistic simulation.