• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2003년도 추계총회 및 연구발표회 초록집
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• pp.96.1-96
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• 2003

• 한국분말재료학회지
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• 제17권4호
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• pp.263-269
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• 2010

Hexagonal barium ferrite ($BaFe_{12}O_{19}$) nano-particles have been successfully fabricated by spraypylorysis process. $BaFe_{12}O_{19}$ precursor solutions were synthesized by self-assembly method. Diethyleneamine (DEA) surfactant was used to fabricate the micelle structure of Ba-DEA complex under various DEA concentrations. $BaFe_{12}O_{19}$ powders were synthesized with addition of Fe ions to Ba-DEA complex and then fabricated $BaFe_{12}O_{19}$ powders by spray-pyrolysis process at the temperature range of $800{\sim}1000^{\circ}C$. The molar ratio of Ba/DEA and heat-treatment temperatures significantly affected the magnetic properties and morphology of $BaFe_{12}O_{19}$ powders. $BaFe_{12}O_{19}$ powders synthesized with Ba/DEA molar ratio of 1 and heat-treated at $900^{\circ}C$ showed the coercive forces (iHc) of 4.2 kOe with average crystal size of about 100 nm.

• 한국재료학회지
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• 제9권1호
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• pp.51-56
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• 1999

The $BaTiO_3$ powders were synthesized by GNP (Glycine-Nitrate process). The powders were prepared using carbonate and alkoxide as starting materials and nitric acid was used as a solvent for starting materials as well as an oxidant for combustion. the effects of aggregates in $BaTiO_3$ powders on green densities, sintering and dielectric characteristics were investigated. When the glycine/cation molar ratio was 1.2, reactivity of self-combustion was most intensive and the degree of aggregates after calcination was low. On sintering at $1400^{\circ}C$, maximum theoretical relative density(94.99%%0 was obtained in case of 1.2 molar ratio of glycine/cation. The dielectric constant of this sintered $BaTiO_3$ was 1919.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.33-34
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• 2008

Barium titanate (BaTiO3) is one of the most important dielectric materials for the electronic devices, such as MLCC (Multilayer Ceramic Capacitor). The thickness of the dielectric thin film in MLCC has become thinner and reached about 0.8 ${\mu}m$. Further down sizing is required for the higher performance. For this reason, we should take into account for the size effect of Barium titanate powders. In this study, we demonstrated that size effect for BaTiO3 (0.2 ~ 0.5 ${\mu}m$, hydrothermal BT) could be estimates by using dielectric properties analysis together with the powder properties.

• 한국군사과학기술학회지
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• 제14권2호
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• pp.305-312
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• 2011

Bacillus anthracis(Ba) is a Gram-positive spore-forming bacterium that causes the disease anthrax. The feature of Ba is the presence of two large virulence plasmids, pXO1 and pXO2. Molecular genotyping of Ba has been difficult to the lack of polymorphic DNA marker. Ba isolated from Korea has been genotyped using various nucleotide analysis methods, such as 16s rDNA sequencing and multiple-locus variable-number tandem repeat (MLVA) analysis. We identified genotypes that represent a genetic lineage in the B1 cluster. This study emphasized the need to perform molecular genotyping when attempting to verify a strain-specific Ba.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 춘계학술대회
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• pp.51-54
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• 2006

Cathode material, $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$, for low temperature SOFC was prepared by the glycine-nitrate synthesis process (GNP). The characteristics of the synthesized powders were studied with controlling pH of a precursor. The synthesis BSCF powders with pH were agglomeration state and calcinations temperature has not influence on particles. Highly acidicprecursor solution increased a single phase forming the temperature. Also, synthesis BSCF powder was show result for thermal analysis and alteration of difference crystal with pH. It is considered that Ba and Sr cannot complex by carboxylic acid group of glycine, because under highly acidic condition the caboxylic group mainly combined with $H^+$ insead of alkali and alkaline earth cations. In case of using precursor solution with pH $2{\sim}3$, a single perovskite phase was obtained at $1000^{\circ}C$. Polarization resistance of $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ was measured by AC impedance spectroscopy from the two electrode symmetric cell. Area specific resistance of the $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ air electrode at $500^{\circ}C\;and\;600^{\circ}C$ were $0.96{\Omega}?cm^2$ and $0.16{\Omega}?cm^2$, respectively.

• 혜화의학회지
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• 제16권2호
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• pp.121-130
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• 2007

In oriental medicine, there is the fundamentals to lead a stirring life, and it is an important matter that make a study of fundamentals for treatment. The su-wen(素問) mentions the fundamentals of sheng(生之本), the fundamentals of qi(氣之本), the fundamentals of feng-cang(封藏之本), the fundamentals of ba-ji(罷極之本) and the fundamentals of cang-lin(倉廩之本). They are terminologies expressing physiological functions of the five viscera - heart, lungs, kidneys, liver and spleen. The five viscera are expressed through face, fur, hair, nail and lips. And the five viscera are closely connected with blood, skin, bone, muscle and flesh. Through the changes of personal appearance, we can recognize those of their internal organs. In oriental medicine, they are called as the cang-xiang(藏象). Heart is the fundamentals of sheng(生), and it is related to spirit, blood and blood vessel. Lungs are the fundamentals of qi(氣), because they master the extensive meaning of qi(氣). Kidneys are the fundamentals of feng-cang(封藏) which means seclusion. Liver is the fundamentals of ba-ji(罷極) that have several view by concept. Spleen, stomach, large and small intestines, paunch and bladder are the fundamentals of cang-lin(倉廩), that is to say, gastrointestinal tract that ingest diet and digest it.

• 한국전기전자재료학회논문지
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• 제35권6호
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• pp.610-615
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• 2022

BaTiO₃ is one of the ferroelectric materials with excellent dielectric properties such as high dielectric constant, low dielectric loss, and is widely used for the manufacturing of capacitors, piezoelectric converters, microsensors, and ferroelectric memories. Inkjet printing is a technology which uses digital and contactless methods which significantly improves flexibility associated with material and structural design, reducing manufacturing costs. Therefore, the top and bottom electrodes, BaTiO₃ ink, and photocurable resin were all printed by an inkjet to produce a BaTiO₃ capacitor. The properties of the printed thin film were analyzed. It was confirmed that the photocurable resin ink was well-infiltrated between the BaTiO₃ powder particles printed by inkjet. The dielectric properties of the capacitor such as dielectric constant which varies in accordance with frequency, polarization and tunability that changes with voltage, were measured.

• 한국분말재료학회지
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• 제16권6호
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• pp.410-415
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• 2009

Hexagonal barium ferrite ($BaFe_{12}O_{19}$) nano-particles have been successfully synthesised using selfassembly method. Diethyleneamine (DEA) surfactant was used to fabricate the micelle structure of Ba-DEA complex under various DEA concentrations. $BaFe_{12}O_{19}$ powders were synthesized with addition Fe ions to Ba-DEA complex and then heat treated at temperature range of 800-1000${\circ}C$. The molar ratio of Ba/DEA and heat-treatment temperature significantly affected the magnetic properties and morphology of $BaFe_{12}O_{19}$ powders. $BaFe_{12}O_{19}$ powders synthesized with Ba/DEA molar ratio of 1 and heat-treated at 1000${\circ}C$ for 1 hour showed the coercive forces (iHc) of 4.84 kOe with average crystal size of about 200 nm.

• 한국식품위생안전성학회지
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• 제28권3호
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• pp.202-206
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• 2013

악성도가 높은 점액표피양 암종은 치료가 어렵고 5년 생존률이 매우 낮다. 따라서, 새로운 치료 물질과 분자표적을 찾는 것이 필요하다. Betulinic acid (BA)는 세계적으로 쉽게 얻을 수 있는 물질인 동시에 여러 종류의 종양에서 항암효과를 보인다. 또한 여러 정상 조직은 BA에 저항성을 보인다. 이 연구에서는 BA의 증식억제 효능과 MC-3 세포주에서의 분자 표적을 확인하고자 하였다. BA는 MC-3 세포주에서 세포 생존을 저해하였고 세포사멸을 유도하였다. BA는 Sp 1과 그의 하향 분자 표적인 survivin에 영향을 주었으나, 다른 하향 분자 표적인 Mcl-1에서는 유의한 변화를 일으키지 못하였다. 따라서, BA는 Sp1과 survivin을 조절하여 세포사멸을 일으키는 잠재적인 항암제 후보가 될 수 있을 것이라 사료된다.