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Structural investigation of BaIrO3 by neutron diffraction
Chang Bin,Jeong Jinwon,Noh Han-Jin,Lee Seongsu 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.10
We report a temperature-dependent neutron difraction (ND) study on polycrystalline monoclinic BaIrO3 which is famous for charge density wave (CDW) and weak ferromagnetic phase transitions at TC∼ 180 K simultaneously. A Rietveld analysis on the ND patterns reveals that even though there is no symmetry breaking in crystal structure, a noticeable change in the four kinds of IrO6 octahedra is isolated as the temperature approaches to TC. Based on the structure analysis results, we calculated the d-orbital energy level splittings by crystal electric feld for each type of the IrO6 octahedra. By taking into account the strong spin-orbit coupling in Ir 5d orbitals and the lattice distortions obtained from the ND analysis, we propose an electronic confguration model to understand the phase transition of the system, where an efective Jef f,1∕2 Mott insulating phase and a charge gap phase induced by bonding states between the Jef f,1∕2 states compete each other.
Changbin Woo 서울대학교 국제학연구소 2018 Journal of International and Area Studies Vol.25 No.1
This study attempts to examine the effect of good governance or quality of government on the happiness and find out whether the technical quality of governance lead to happiness universally in both rich and poor countries. The study applies multi-level analyses on happiness data from WVS to examine the interplay of individual characteristics and the country context. Unlike the previous literature that argue that efficient government are of importance for both richer and poorer countries, this study finds that good governance enhances the level of happiness only in the high-income countries. Specifically, the effect of technical or delivery quality of governance is limited to relatively rich nations, suggesting that improvement of the technical quality of governance, or efficiency-oriented transformation of government does not ineluctably lead to a higher level of happiness.
Changbin Lim,Sahong Lee,Seung-Min Park,Jung Lyul Lee 한국해양공학회 2020 韓國海洋工學會誌 Vol.34 No.6
Wave field changes resulting from artificial coastal structures constructed in coastal zones have emerged as a major cause of beach erosion, among other factors. The rates of erosion along the eastern coast of Korea have varied mainly owing to the construction of various ports and coastal structures; however, impact assessments of these structures on beach erosion have not been appropriately conducted. Thus, in this study, a methodology to assess the impact of erosion owing to the construction of artificial structures has been proposed, for which a parabolic bay shape equation is used in determining the shoreline angle deformation caused by the structures. Assuming that the conditions of sediment or waves have similar values in most coastal areas, a primary variable impacting coastal sediment transport is the deformation of an equilibrium shoreline relative to the existing beach. Therefore, the angle rotation deforming the equilibrium of a shoreline can be the criterion for evaluating beach erosion incurred through the construction of artificial structures. The evaluation criteria are classified into three levels: safety, caution, and danger. If the angle rotation of the equilibrium shoreline is 0.1° or less, the beach distance was considered to be safe in the present study; however, if this angle is 0.35° or higher, the beach distance is considered to be in a state of danger. Furthermore, in this study, the distance affected by beach erosion is calculated in areas of the eastern coast where artificial structures, mainly including ports and power plants, were constructed; thereafter, an impact assessment of the beach erosion around these areas was conducted. Using a proposed methodology, Gungchon Port was evaluated with caution, whereas Donghae Port, Sokcho Port, and Samcheok LNG were evaluated as being in a state of danger.
Changbin Wang,Anye Cao,Guangan Zhu,Guangcheng Jing,Jing Li,Tian Chen 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.3
Rock burst hazards induced by fault slip frequently occur in underground mining and threaten the safety of miners. In this paper, the structures of overlying strata, mechanism of fault slip, and rock burst pre-warning using seismic tomography were investigated in LW7192, a specific island longwall panel in Xuzhuang Colliery. The results show that an asymmetrical “T” structure of overlying strata is formed during LW7192 retreat, and the long hanging length of overlying key strata is maintained due to the short panel width. By analysing a modified fault sliding model, it is found that the time interval between two fault slips has a positive correlation with the energy released therein. The rock burst that occurred in LW7192 has the longest time interval between events compared with other high-energy tremors near the fault, and enormous elastic energies released by fault slip as a form of dynamic load. The superposition of dynamic loads and high stress concentration of the coal-rock mass contributes to the rock burst in LW7192. For forecasting rock burst hazards, seismic tomography was used and the results show that the velocity anomaly regions correspond well with the area of both strong tremors and the rock burst. Ultimately, large-diameter boreholes, directional hydraulic fracturing boreholes, and floor distressing boreholes were taken in the rock burst area, and the pressure relief is proved effective by seismic tomography assessment.
Structural Behavior of 3D Printed Concrete Specimens with Reinforcement
Changbin Joh(조창빈),Jungwoo Lee(이장우),In-Hwan Yang(양인환) 한국건설순환자원학회 2018 한국건설순환자원학회 논문집 Vol.6 No.3
본 연구에서는 프린트 층 사이에 부착에 초점을 두고 3D 프린팅 콘크리트의 구조거동 연구를 수행하였다. 3D 프린팅 콘크리트의 부착 및 인장강도 실험을 수행하고 일괄 타설 콘크리트 실험결과와 비교하였다. 실험변수는 콘크리트 층 사이의 프린트시간차와 철근 보강 여부이다. 콘크리트 층 사이에는 공극이 존재하고 이에 따라, 강도 감소가 발생한다. 층 사이 대부분의 인장부착 강도 감소는 응력 집중과 프린트 시간차에 기인한다. 프린트 시간차가 24시간을 초과할 때 인장부착 강도의 감소는 구조거동에 영향을 미친다. 층 사이 철근 보강은 연성거동 증진에 유용하고 구조물의 갑작스런 파괴를 예방한다. 또한, 공극이 유발한 응력 집중에 기인한 휨 강도 감소는 횡방향 하중을 받는 3D 프린트 벽체 구조물 설계시에 고려되어야 한다. This paper examines the structural behavior of 3D printed concrete specimens with focus on the bond between the layers. The tensile bond and flexural strengths were investigated experimentally and compared with those of specimens made by conventional mold casting. The test parameters were the time gap between printing layers and the reinforcement between vertical layers. The results showed the 3D printed specimens had voids between layers and confirmed the strength reduction due to printing time gap and the stress concentration caused by the voids. Most of the reduction in tensile bond strength between layers was due to the stress concentration at least up to certain printing time gap. Moreover, beyond a certain printing time gap (24hours), the additional reduction in tensile bond strength reached a level that could affect the structural behavior. The reinforcement between layers was helpful to increase the ductile behavior which is essential to prevent the sudden collapse of the structure. In addition, the reduction in flexural strength due to the stress concentration by the voids was observed and should be considered in the design of 3D printed wall structures against the lateral load.
Im, Changbin,Park, Dongwon,Kim, Hosung,Lee, Jaeyoung Elsevier 2018 Journal of Energy Chemistry Vol.27 No.5
<P>We observe the influence of Al occupancies in Li sites on the formation process of the garnet solid electrolyte of Li7La3Zr2O12 (LLZO). A direct incorporation of Al is first promoted in a Li-insufficient garnet solid electrolyte during the calcination process of 850 degrees C and then the cubic phase of LLZO is obtained after successive annealing step of 1000 degrees C. Comparing to pristine LLZO, Al incorporated LLZO shows less formation of Li-2 CO3, keeping crystallographic and physicochemical properties. This Al incorporation improves both the ionic conductivity and interfacial resistance to poisoning procedure. (c) 2017 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.</P>
ODBMS 상에서 OpenGIS SFCORBA 정보 저장소의 구현
송창빈(Changbin Song),김기홍(Kihong Kim),유승원(Seungwon Yoo),차상균(Sang K. Cha) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅰ
사회 경제적으로 지리 정보에 대한 관심이 커지고 있으며 인터넷 기술의 보급으로 일반인들도 지리 정보를 쉽게 접근할 수 있게 되었다. OpenGIS는 지리 정보를 표현하고 공유하는데 필요한 데이터 모델 및 상호 연동을 위한 표준이며 CORBA, OLE/COM, SQL 세가지 환경에 대해 구현 명세가 있다. 본 논문은 ODBMS를 저장 시스템으로써 사용하고 CORBA를 분산 객체 기술로 활용하여 OpenGIS SFCORBA(Simple Features Specification for CORBA) 인터페이스를 구현하는 방법을 설명한다. 특히 ODBMS와 SFCORBA 사이의 인터페이스를 변환하는 Wrapper의 역할, 자동 생성 방법, 구현 등을 중심으로 기술한다.