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문경석,Moon, Kyoung-Seok 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.2
Grain-growth behavior in the $95Na_{1/2}Bi_{1/2}TiO_3-5BaTiO_3$ (mole fraction, NBT-5BT) system has been investigated with the addition of $Na_2CO_3$. When $Na_2CO_3$ is added to NBT-5BT, the growth rate is higher than desired and grains are already impinging each other during the initial stage of sintering. The grain size decreases as the sintering temperature increases. With the addition of $Na_2CO_3$, a liquid phase infiltrates the interfaces between grains during sintering. The interface structure can be changed to be more faceted and the interface migration rate can increase due to fast material transport through the liquid phase. As the sintering temperature increases, the impingement of abnormal grains increases because the number of abnormal grains increases. Therefore, the average grain size of abnormal grains can be decreased as the temperature increases. The phenomenon can provide evidence that grain coarsening in NBT-5BT with addition of $Na_2CO_3$ is governed by the growth of facet planes, which would occur via mixed control.
Na<sub>1/2</sub>Bi<sub>1/2</sub>TiO<sub>3</sub>-BaTiO<sub>3</sub> 계에서 입자모양과 입자성장 거동
문경석,강석중,Moon Kyoung-Seok,Kang Suk-Joong 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.2
The grain growth behavior of $0.95Na_{1/2}Bi_{1/2}TiO_{3}-0.05BaTiO_{3}$ (NBT-5BT) has been investigated with respect to the grain shape. The powder compacts of NBT-5BT were sintered at 1200 for various times. The corresponding equilibrium shape was a round-edged cube with flat {100}-faces. Abnormal grains were not observed in the specimens sintered for 1 to 12 h but abnormal grains appeared when sintered for 24 h. Before the formation of abnormal grains, a valley was observed in the measured grain size distribution of NBT-5BT, showing that the grain size distribution was a combination of two unimodal distributions. The present result suggests that the grain growth in NBT-5BT was governed by the growth of facet planes which would occur via 2-dimansional nucleation and growth.
CORBA 환경에서 동적 속성을 사용하는 트레이더의 구현
문경석,방대욱 啓明大學校 産業技術硏究所 1998 産業技術硏究所 論文報告集 Vol.21 No.2
The recent trends in programming distributed applications are to use distributed middlewares widely. Distributed middlewares need to use traders in order to connect quickly appropriate distributed objects. Especially dynamic traders are very available to some distributed applications, which use current values of properties in the server's evaluation. In this paper, we propose a CORBA implementation model of a trader with dynamic properties, and define its CORBA IDL interfaces and C++ implementation functions. The proposed trader inherits the advantages of CORBA and selects the best server for the client by the dynamic evaluation of server's properties when an import request is occurred. The proposed trader promotes the performance of the load-sensitive distributed applications in case that servers have either heavy loads or the big difference between their loads.
문경석(Kyoung-Seok Moon) 한국세라믹학회 2021 세라미스트 Vol.24 No.3
The sintering process transported the atoms in the materials by decreasing the total interface energy. The microstructure changes as a result of grain growth and densification under the capillary driving force due to the interface curvature among grains. The grain growth rate is expressed as the product of the interface mobility and the driving force. According to grain growth theories, the mobility of the interface governed by diffusion control is constant but interface mobility is nonlinear when the movement of an interface is governed by interface reaction. As the growth rate is nonlinear for the regime of interface reaction control, the grain growth is nonstationary with annealing time. The microstructure can be controlled by changing the growth rate of an individual grain with the correlation between the maximum driving force and the critical driving force for appreciable growth. The present paper discusses applications of the principle in the fabrication of dielectric and magnetic ceramic materials.
기술노트 : 표준화력발전소의 발전폐수 통합을 이용한 용수 사용량 절감
문경석 ( Gyeong Seok Mun ),장희수 ( Heui Su Jang ) 한국물환경학회 ( 구 한국수질보전학회 ) 2006 한국물환경학회지 Vol.22 No.3
The Water usage is relationship which is close with the administrative cost from industrial facility. It is not easy to reduce a water usage. This research is the optimization of the waste water quantity which process waste water integration of the standard thermal power plant in system operate time. The turbine rotates by force of the steam and it produces an electricity. Demineralization Water is manufacture purity manufacturing equipment and it is supplied in power plant channel. We knew a possibility of reducing from pure control process. When it is reduced the Back Washing time, Rinsing time of the gravity filter and the activated carbon filter. Also, It is possible even from regeneration phase in Condensate Polishing Demineralization System. In addition, There is also the water which the drain of the sampling water for watching the condition of power plant process will be able to use. Integrates these processes it will be able to reduce an annual 30,000 ton degree. The research is want to use the fundamental data for the water curtailment of the power plant.
(K0.5Na0.5)NbO3-CaZrO3 계에서 입자모양과 입자성장 거동
이철이,문경석 한국분말재료학회 2022 한국분말재료학회지 (KPMI) Vol.29 No.2
The grain growth behavior in the (1-x)K0.5Na0.5NbO3-xCaZrO3 (KNNCZ-x) system is studied as a function of the amount of CZ and grain shape. The (1-x)K0.5Na0.5NbO3-xCaZrO3 (KNNCZ-x) powders are synthesized using a conventional solid-state reaction method. A single orthorhombic phase is observed at x = 0 – 0.03. However, rhombohedral and orthorhombic phases are observed at x = 0.05. The grain growth behavior changes from abnormal grain growth to the suppression of grain growth as the amount of CaZrO3 (CZ) increases. With increasing CZ content, grains become more faceted, and the step-free energy increases. Therefore, the critical growth driving force increases. The grain size distribution broadens with increasing sintering time in KNNCZ-0.05. As a result, some large grains with a driving force larger than the critical driving force for growth exhibit abnormal grain growth behavior during sintering. Therefore, CZ changes the grain growth behavior and microstructure of KNN. Grain growth at the faceted interface of the KNNCZ system occurs via two-dimensional nucleation and growth.
김승건,문경석,이호원 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
초유는 어미 젖소가 새끼를 낳고 72시간이내에 생산되는 우유를 칭한다. 초유에는 면역글로불린, 성장인자, 락토페린, 리소짐 및 면역체계를 강화하는 PRP, 사이토킨, 세포재생을 도와주는 EGF, PDGF 등 생명유지에 필수적인 50여 가지 생리활성 성분이 함유되어 있다. 또한 초유는 면역증강, 성장촉진, 항균, 두뇌발달, 근육질강화, 콜레스테롤 저하 등에 효과가 있다고 알려져 있다. 감귤은 비타민, 미네랄, 식이섬유, 유기산 및 유리당과 정균 및 항균작용을 나타내는 플라보노이드 화합물, 항산화 작용과 항암작용이 있는 나린진, 지질과산화물 형성을 억제하며 노화지연 등의 항산화 효과, 항염증 효과, 모세혈관 보호 및 항암작용, 콜레스테롤을 낮추는 작용을 하는 헤스페리딘 등의 다양한 기능성 물질을 함유하고 있다라고 보고된 바 있다. 본 연구에서는 초유 분말 및 감귤농축액을 함유한 츄어블 태블릿의 제조 방법을 제시하였다. 또한 제조된 츄어블 태블릿의 초유 분말 및 감귤농축액을 함유에 따른 DPPH 라디컬 및 ABTS 라디컬 소거능의 특성 변화를 조사하였다. **본 연구는 2016년도 산학연협력 기술개발사업(No. C0453626)의 연구결과임.