• 동의신경정신과학회지
• /
• 제17권1호
• /
• pp.1-16
• /
• 2006

Objective: An water extract of the Hwang-Ryun-Chung-Sim-Um (HRC) was assessed to determine the mechanisms of its antioxidant activity. In addition, the HRC was examined in vitro for the inhibitory effect on the acetylcholinesterse (AChE). Methods: The HRC exhibited a concentration-treatment; scavenging ${\alpha},{\alpha}-diphenyl-{\beta}-picrylhydrazyl$ (DPPH) radical, linoleic acid oxidation in a thiocyanate assay system, hydroxyl radical-induced DNA nicking. We investigated mRNA levels such as catalase activity, superoxide-dismutase and glutathione peroxidase. The water extract of HRC showed inhibitory effect on AChE activity. Result: The HRC extract showed dose-dependent free radical scavenging activity, including DPPH radicals and hydroxyl radicals, using different system. The HRC was also found to be effective in protecting plasmid DNA against the strand breakage induced by Hydroxyl radicals in Fenton's reaction mixture. Futhermore, catalase mRNA expression levels increased, but SOD1 and MnSOD was not expressed. HRC in a various concentration-dependent decreased AChE mRNA levels and inhibitory effect showed AChE. Conclusion: According to the above results, it is supposed that HRC is applicable to the Dementia-type of Alzheimer clinically.

• 한국결정학회지
• /
• 제8권1호
• /
• pp.33-37
• /
• 1997

(1012)면 사파이어 기판위에서 성장되는 (12f10)면 GaN 이종적층막의 광학적 특성을 연구하였다. GaN 이종적층막은 $Ga/HC1/NH_3/He$계를 사용한 HVPE(halide vapor phase epitaxy)방법에 의하여 $990^{\circ}C$의 온도에서 성장시켰다. 이종적층막의 표면조직과 결정구조는 XRD, RHEED와 SEM으로 확인하였다. 결정구조가 확인된 (1210)면 GaN 단결정막의 광학적 특성은 PL과 Ra-man으로 관찰하였다. Raman 측정은 광학적포논에 기인된 활성모드를 결정축에 대하여 레이저빔의 편광과 진행방향에 의해 변화하는 것을 관찰하였다. Y(Z, Y & Z) X 방향에서의 측정은 $A_1(TO)=533\;cm^{-1},\;E_1(TO)=559\;cm^{-1}$과 $E_2=568\;cm^{-1}$ 모드에 기인된 Raman 스펙트럼을 관찰할 수 있었으며 Z(Y, Y & Z) X 방향에서의 측정은 $E_2$포논 만이 검출되었다.

• 대한토목학회논문집
• /
• 제26권6D호
• /
• pp.1011-1017
• /
• 2006

습지 생태계는 환경의 변화에 민감하여 인위적 간섭에 매우 취약하다. 습지는 육상과 수상생태계의 전이지대이며 인간생활에 매우 중요하다. 따라서 습지의 보전과 관리대책 마련이 필수적이다. 습지 분포지역의 명확한 위치정보, 속성자료를 포함하는 수치지도와 지리정보시스템(GIS)을 이용한 Environment-GIS(E-GIS)의 개선이 필요하다. 본 연구에서는 산지습원에 대한 통합 DB로서 습지관리의 기초자료를 구축하는 방법의 표준안을 제시하였다. 기준점 측량방식을 이용하여 수치지도를 이용한 정확한 위치를 규정하였고 습지분포 수치지도 영역을 표현하였다. 이로써 지리정보를 이용한 GIS DB로 전환하여 도형, 속성정보를 수치화 하였다. 본 연구에서 구축된 습지정보를 기반으로 연구범위 내 환경부 지정 대표 보존습지의 구성인자인 지형, 지질, 동 식물상 분포를 분석하여 발견되지 않은 습지 분포지역을 예측 할 수 있는 활용방안을 제시하였다.

• 한국결정성장학회:학술대회논문집
• /
• 한국결정성장학회 1997년도 Proceedings of the 12th KACG Technical Meeting and the 4th Korea-Japan EMGS (Electronic Materials Growth Symposium)
• /
• pp.253-259
• /
• 1997

The iron doped GaAs single crystals were grown by liquid phase epitaxial method and its some physical properties were evaluated with a view to investigate the crystal quality and emission property. The isomer shift of 0.303mm/sec is calculated from low-temperature M ssbauer spectroscopy and we know that charge state of iron ion is 3+ in GaAs crystal. In low temperature photoluminescence, the deep emission bands with wide-line width have been observed at 0.99eV and 1.15eV in addition to sharp excitonic peaks. We attributed that these deep emissions are originated from substitutional Fe-acceptor which has charge state of 3+ and 2+, respectively.

• 대한가정학회지
• /
• 제37권8호
• /
• pp.117-132
• /
• 1999

This study analyzed how not only socio-economic variables but also lifestyle variables affect the expenditure and the patterns of households. The result of multiple regression analysis resealed that economic variables(e.g, income, saving, property) and lifestyle variable(e.g, enjoyment and convenience seeking type) affected the consumption expenditure. Based on the result of cluster analysis, The consumption expenditure patterns of urban households were separated as 1)necessity dominant pattern, 2)transportation $.$ communication dominant patters, 3)other consumption dominant pattern, 4)education$.$culture and recreation dominant pattern. The result of logistic analysis revealed that debt, saying and living location variables were major factors to determine the consumption expenditure patterns of urban households. But did not Influence on the Consumption Expenditure Patterns.

• 대한수학회지
• /
• 제55권4호
• /
• pp.833-848
• /
• 2018

In this paper we study the existence of conditional expectation for closed and convex valued Pettis-integrable random sets without assuming the Radon Nikodym property of the Banach space. New version of multivalued dominated convergence theorem of conditional expectation and multivalued $L{\acute{e}}vy^{\prime}s$ martingale convergence theorem for integrable and Pettis integrable random sets are proved.

• 한국주조공학회지
• /
• 제32권5호
• /
• pp.225-230
• /
• 2012

In this study, a more practical and simulation approach which can predict the mechanical properties of aluminum alloys is proposed. First, cooling rate, micro-structure, and mechanical properties of casting product were measured through casting experiment. The relation between cooling rate and SDAS decrease exponentially and the linearly decreasing relation exist between SDAS and mechanical properties. Then, the cooling rate was calculated by casting process simulation and the mechanical properties were predicted by using the relations that were derived through experiment. Experimentally measured mechanical properties and predicted values by simulation were in the range of relatively small difference. The mechanical properties of various Al alloys are expected to be predicted by the casting process simulation before actual casting.

• 만화애니메이션 연구
• /
• 통권47호
• /
• pp.439-461
• /
• 2017

중국 고대사회에 있어 효 문화는 가부장제도 아래에서 도덕규범의 실천적 원리였다. 조아(曹娥)는 중국의 대표적인 효의 상징인물로, 원래 무녀(巫女)였으나 한대의 주류 사상인 유가철학의 전파와 함께 효녀의 형상으로 전환되었으며, 이후 지역문화의 발전과 함께 민간의 신앙과 접목하여 수신(水神)의 개념으로 재탄생하기도 하였다. 조아설화의 전파과정 중, 구전과 문학적 가공은 상호적인 작용을 통해 영향을 주고받으며, 미화되거나 신성화되고 체계화 되었는데, 조아도상은 이러한 인류가 추구하는 보편적이며 온전한 사유적 형상의 체현이다. 예컨대, 현대사회에 있어 문화적 정체성과 함께 그 이면의 근본적인 내적 함의의 인식이 중요하다. 그러므로 조아의 효를 주제로 한 사회기반의 문화콘텐츠의 창작과 이를 통해 효가 가진 문화적 핵심가치를 찾는 것은 의미 있는 일이다. 본문은 조아설화와 효사상 그리고 문화원형을 사례중심으로 서술하였으며, 조아의 민간신앙적 신성화 측면에서 문학으로부터 파생된 가공과 도상의 형성 사이의 관계를 이해하고, 이미지의 변화와 조형성을 통한 문화콘텐츠로서의 가능성을 살펴보았다.

• 소성∙가공
• /
• 제12권1호
• /
• pp.34-42
• /
• 2003

This paper presents a rigid-plastic finite element method to handle the frictional contact problem between two deformable bodies experiencing large deformation. The variational formulation combined with incremental quasi-static model is employed for treating the contact boundary condition. The frictional behavior of the model obeys Coulomb's law of friction. The proposed contact algorithms are classified into two categories, one for searching contacting nodes and the other for calculating contact forces at the contact surface. A slave node and master contact segment are defined using the geometric condition of finite elements on the contact interface. The penalty parameter is used to limit the penetration between contacting bodies, and the finite elements are coupled with contact boundary elements.us gates and cavity thicknesses. Through this study we have observed that the jetting is related to the die swell of material. This means that the jotting is strongly affected by the elastic flow property rather than the viscous flow property in viscoelastic characteristics of molten polymer. Different resins have different elastic properties, and elastic flow behavior depends on the shear rate of flow, i.e. injection speed. Large die swell would eliminate jetting however, the retardation of die swell would stimulate jetting. In the point of mole design, reducing the thickness ratio of cavity to gate can reduce or eliminate jetting regardless of amount of elasticity of polymer melt.

• 한국전자거래학회:학술대회논문집
• /
• 한국전자거래학회 1999년도 학술대회지 vol.2
• /
• pp.575-586
• /
• 1999

The advent of the Internet and the enormous increase in volume of electronically stored information (SGML, Image, Sound, etc.) has led to substantial work on IR(Information Retrieval). To service on the WWW, construction and retrieval technology of SGML, which is the fundamental standard data format for CALS/EC, is needed specially. Due to such a change, it becomes essential to change the existing paradigm of conventional information retrieval systems and to adopt new Internet service system with search engine, SGML browser and advanced Internet technology on WWW. KIPRIS(Korea Industrial Property Rights Information Service), which is the specialized and integrated Internet service systems in the field of industrial property rights information service, is trying to be a guide for our country to establish its technological competitiveness with providing the online service of high quality. The objective of the paper identifies features and technologies of KIPRIS IR(Information Retrieval) system based on WWW as follows. First, it describes the development background and process of KIPRIS. Second, it presents a fundamental technology that consists of IR(Information Retrieval) concept, BRS(Bibliographical Retrieval System) search engine, SGML implementation technologies and the Internet/WWW technologies. Third, it provides information about system configuration, architecture, and the features and characteristics of KIPRIS. Finally, the implemented KIPRIS system is introduced.