We synthesized YOF(yttirum oxyfluoride) powders through solid state reactions using Y2O3 and YF3 as raw materials. The synthesis of crystalline YOF was started at 300 oC and completed at 500 oC. The atmosphere during synthesis had a negligible effect on the synthesis of the YOF powder under the investigated temperature range. The particle size distribution of the YOF was nearly identical to that of the mixed Y2O3 and YF3 powders. When the synthesized YOF powders were used as a raw material for the suspension plasma spray(SPS) coating, the crystalline phases of the coated layer consisted of YOF and Y2O3, indicating that oxidation or evaporation of YOF powders occurred during the coating process. Based on thermogravimetric analysis, the crystalline formation appeared to be affected by the evaporation of fluoride because of the high vapor pressure of the YOF material.

The purpose of this study was to investigate the appropriate amount of oats to add to rice and the merits of oat meal. We analyzed the physicochemical characteristics, cooking properties, functional components, and sensory evaluation according to the amount of oats added in the cooked rice. Compared with rice, the oat showed higher level in protein, fat, total β-glucan and total polyphenol, but not for starch. Therefore, the amount of chemical and functional components was increased significantly with the increase in the amount of oats added. Water absorption and expansion were decreased with the increase in the amount of oat added. Oleic acid content was increased and linoleic acid content was decreased slightly. Unsaturated fatty acid content was greatly increased. The DPPH and ABTS radical scavenging activity were increased significantly according to the amount of oats added. As a result of sensory evaluation, the most appropriate amount of oat added was 20% and 30%. By the addition of oat, the β- glucan content of the cooked rice and the antioxidant activity could increase.

We have investigated a glass-forming region of V2O5- P2O5-ZnO glass and the effects of the addition of modifier oxides (B2O3) to the glass systems as a sealing material to improve the adhesion between the glass frits and a soda lime substrate. Thermal properties and coefficient of thermal expansion were measured using a differential scanning calorimetry, a dilatometer and a hot stage microscopy. Structural changes and interfacial reactions between the glass substrate and the glass frit after sintering (at 400 oC for 1 h) were measured by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscope. The results showed that the adhesion strength increases as the content of B2O3 at 5 mol% increases because of changes in the structural properties. It seems that the glass structures change with B2O3, and the Si4+ ions from the substrate are diffused to the sealing glass. From these results, we could understand the mechanism of strengthening of the adhesion of soda lime silica substrate by ion-diffusion from the substrate to the glass.

AlN epilayers were grown on a c-plane sapphire substrate using hydride vapor phase epitaxy (HVPE). A series of AlN epilayers were grown at 1120˚C with V/III ratios 1.5, 2.5 and 3.5, and the influence of V/III ratio on their properties was investigated. As the V/III ratio was increased, the surface roughness (RMS roughness), Raman shift of E2 high peaks and full-width at half-maximum (FWHM) of symmetrical (002) & asymmetrical (102) of the AlN epilayers increased. However, the intensities of the Raman E2 high peaks were reduced. This indicates that the crystal quality of the grown AlN epilayers was degraded by activation of the parasitic reaction as the V/III ratio was increased. Smooth surface, stress free and high crystal quality AlN epilayers were obtained at the V/III ratio of 1.5. The crystal quality of AlNepilayers is worsened by the promotion of three-dimensional (3D) growth mode when the flow of NH3 is high.

본 연구에서는 3%의 통보릿가루를 첨가하여 Lactobacillus acidophilus, Lactobacillus delbrueckii subsp. Bulgaricus와 treptococcus thermophilussei 등 3종의 균주를 단일균 또는 혼합균 조합별로 이용하여 요구르트를 제조하고 젖산균주에 따른 요구르트 품질 특성을 알아보았다. 대조군과 보릿가루 첨가군의 요구르트 품질특성은 균주 종류 및 조합에 따라 유의적인 차이를 나타내었다. 보릿가루 무첨가군인 대조군에서는 LBST 복합균으로 제조한 요구르트가 적정pH, 산도, 점도, 항산화활성 등에서 좋은 특성을 나타내었으며, 다음으로 LALBST 복합균이 좋았다. 보릿가루 첨가군에서는 LALBST가 다른 균주조합에 비하여 낮은 pH, 적합 범위의 적정산도, 높은 항산화활성 등 좋은 요구르트 품질특성을 나타내었으며 β-glucan 함량은 약 0.15%이었다. 대조군과 보릿가루첨가군에서 단독균보다는 복합균이 좋은요구르트 품질특성을 보였고, 보릿가루를 첨가함에 따라 대조군에 비하여 pH는 감소하였고, 적정산도와 당도는 증가하였으며 젖산균수는 감소하였고 점도는 상당한 증가를 보였다. 색도의 경우 L값은 낮았고, a값과 b값은 높았으며 연구결과 LALBST 혼합균주가 보릿가루 첨가 요구르트 제조시 가장 적합한 것으로 판단되었다.

We designed new compositions for lead free and low temperature sealing glass frit of ZnO-V2O5-P2O5 system, which can be used for PDP (Plasma Display Panel) or other electronic devices. The ZnO-V2O5-P2O5 system can be used as a sealing material at temperatures even lower than 430˚C. This system, however, showed lower bonding strength with glass substrate compared to commercialized Pb based sealing materials. So, we added TiO2 as a promoter for bonding strength. We examined the effect of TiO2 addition on sealing behaviors of ZnO-V2O5-P2O5 glasses with the data for flow button, wetting angle, temporary & permanent residual stress of glass substrate, EPMA analysis of interface between sealing materials and glass substrate, and bonding strength. As a result, sealing characteristics of ZnO-V2O5-P2O5 system glasses were improved with TiO2 addition, but showed a maximum value at 5 mol% TiO2 addition. The reason for improved bonding characteristics was considered to be the chemical interaction between glass substrate and sealing glass, and structural densification of sealing glass itself.

Reflection properties, such as specular reflection and diffuse reflection, are very important optical properties for the reflector, which has high reflectance in the display and architecture industry. Calcite is lowcost, nontoxic, and stable over a wide temperature range. Therefore, it is one of the most widely using fillers in many industries and has some advantages over titania as a filler to improve reflectance. However, optical properties, especially those of ceramic-filled composites, have not been analyzed. We studied the reflectance of calcite composites with their surface roughness. The reflectance of the composites was determined using a UV-visible spectrometer. The surface morphology and the micro-structure of the composites were investigated by atomic force microscope. The reflectance of the composites was improved by increasing the content of calcite in the calcite-frit composite. The reflectance is related with the surface roughness in the composites. However, the reflectance depends on the calcite contents in materials with similar surface roughness.

This study investigates Bi2O3-B2O3-BaO-ZnO glass with variations of the Co3O4 content (0.25,0.5,1,and 2wt%) and the interaction between transparent dielectric and Ag electrodes heat-treated at 500-560oC for30min. The glass transition temperature, softening temperature and thermal expansion coefficient were432oC, 460oC and 81.4×10-7/oC, respectively. The transmittance of 0.25wt% Co3O4 to which dielectric wasadded was highest and was decreased due to coloration with the addition of more than 0.25wt%. However,without Co3O4, the transmittance of the transparent layer was decreased due to the formation of Ba5Bi3;however, the occurrence of the crystal phase decreased as a result of the addition of Co3O4. The amount ofCo2+ ions increased as the Co3O4 increased. With a maximum of Co3+ ions, the highest transmittance wasobserved.

According to progress rapidly digitalization, networked and mobilization of electronics industry, there are demands for being smaller, thinner, more light, and more efficient complex functions of electronic devices which are wireless devices, semi-conductors, packages and mobile devices. Therefore, the solder resist on a printed circuit board have been required with the high resolution and the eco-friendly materials in the surface treatments such as high heating process and coating process with electrolysis. In this study, the photoinitiator initiator and monomers of the solder resist were prepared with their contents for reducing the occurrence of the under-cut. We investigated the sample surface by UV/VIS spectrometer, FT-IR, OM after HASL and ENIG process. From our results, it is possible to get a high adhesion of resist with optimal contents between the photoinitiator initiator and monomers after surface treatments.

고온 안정성의 유리계로 알려진 회토류 알루미나 규산염계중, Nd2O3-Al2O3-SiO2(NdAS)계 유리의 응용범위를 찾고자 결정화유리를 제조하여 그 물성의 특성을 평가하였다. NdAS에 결정화제로 TiO2를 첨가하여 내부결정화를 유도하여 생성된 결정화유리에 대하여 결정상과 잔류유리의 물리적, 열적, 기계적 물성을 측정하였다. NdAS-TiO2유리계는 열처리와 조성 조건에 따라 생성된 표면 및 내부결정상은 같은 결정상을 갖는 것으로 X선회절의 결과로 확인되었으나, 알려 있지 않은 결정상으로 내부결정의 경우, 원자구성비는 Nd4.6Si7.2Al4.0Ti2.4O32이었다. 결정화유리의 선팽창계수는 5.4~6.2×10-6/˚C 정도로 경정성장이 일어날수록 증가되었다. 결정화유리중의 결정상의 경도와 탄성계수는각 각 12GPa, 220Gpa으로 나타난 것을 고려한다면 내부결정화에 의한 결정화유리의 물성은 고온 구조용 재료로 활용도가 넓을 것으로 본다.

PDP용 투명유전체 재료로 사용되는 PbO-B2O3-SiO2-Al2O3계의 소성과정 중에서 투명전극 (ITO)과의 반응성 및 광학적, 열적, 전기적 특성을 조사하였다. 본 연구에서 유전체막.두께는 12μm으로, 온도는 550-580˚C에서 소성한 후 여러 물성을 평가하였다 그 결과로, 유전체와 투명전극(ITO)의 반용에서, In 이온이 유전체층으로 확산이동하였으며, Sn 확산은 거의 발생하지 않았다. 선팽창계수, 유전상수, 유리전이온도,광 투과율은 유전체 조성의 PbO 양에 큰 영향을 받았다. PbO양 증가는 선팽창계수와 유전상수를 증가시킨 반면, 유리전이온도와 광 투과율온 저하시켰다. Al2O3/B2O3 비가 증가함에 따라서는 선팽창계수는 감소, 유전상수는 증가, 광 투과율은 감소하였으며, 유리 전이점 변화는 거의 나타나지 않았다.

Purpose : The prescriptions of Dongyisoosebowon (東醫壽世保元) are so different to those of existing Korean medicine(韓醫學). Because Lee Jema (李濟馬, 1837-1900, the author of Dongyisoosebowon) has classified herbal medicines(本草) by the four Sasang constitutions(四象體質). But he has not explained his method in detail. Therefore we make a plan to analyze the herbal medicine of the Dongyisoosebowon prescription by Sung․M i․Guikyung(性․味․歸經), the essential elements of the herbal medicines, to get a idea how Lee Jema has classified the herbal medicines by four Sasang constitutions. Methods : The herbal medicines are chosen from Dongmuyugo(東武遺藁) and Dongyisoosebowon. And they are rearranged by Sung․Mi․Guikyung from Shinnongbonchokyung(神農本草經), Tangaekboncho(湯液本草) Dongyibogam(東醫寶鑑) and Imsangbonchohak(臨床本草學, Clinical Herbology). Result : The herbal medicines classified by Lee Jema have a characteristic trend by their Sung․Mi․Guikyung. In the herbal medicines of Soumin (少陰人), 81.8% of them is characterised in Warm and hot medicine (溫熱藥材) and 68.2% has its action to Bi(脾). In those of Soyangin, 75% of them is characterised in Cool and cold medicine (寒凉藥材) and 60% to Sin(腎), 25.7% to Bangkwnag(膀胱). In those of Taeumin, 63% of them is characterised in Warm and hot medicine, 47.8% in Cool and cold medicine. In all of their classifications, the result of Yakmi(藥味, taste of herbal medicine) analysis is not characteristic. Conclusion : The herbal medicines classified by Lee Jema have a characteristic trend by their Sung․Guikyung.