• 한국비블리아학회지
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• 제18권2호
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• pp.61-88
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• 2007

본 연구의 목적은 국내도서관에서 현행 OPAC의 인터페이스와 기능을 개선하여 차세대 OPAC의 인터페이스와 기능을 갖추는데 실질적인 기초자료와 도움을 제공하는데 있다. 본 연구에서는 OPAC의 개념과 발전과정, 이용자의 도서관 이용행태, OPAC의 이용자 이용행태, 도서관의 위기인식, 도서관의 OPAC 인식 등에 관한 선행연구와 실태조사 결과를 토대로 OPAC의 인터페이스와 기능을 개선하는데 중요하게 고려해야 하는 요소들을 살펴보았다. 그리고 현행 OPAC의 인터페이스와 기능에 관한 사례분석은 검색창, 검색항목, 검색기법, 정렬기능, 검색결과 디스플레이, 검색결과 피드백에 중점을 두었다. 또한 최근에 개발된 국내외 도서관 상용 및 오픈소스 소프트웨어에서 제공하는 차세대 OPAC의 검색 인터페이스, 검색 기능 및 Library 2.0 서비스 측면에서 구체적인 사례를 분석하였다. 마지막으로 국내도서관에서 현행 OPAC의 인터페이스와 기능을 개선하기 위한 방안을 제시하였다.

• 감성과학
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• 제11권1호
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• pp.39-56
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• 2008

음악과 사용자 인터페이스, 인간-컴퓨터 상호작용(HCI) 관련 연구에서는 기본적으로 실제 음악보다는 음악적인 속성을 반영한 음악적 소리를 사용한 경우가 많았다. 본 연구에서는 실제음악이 가전제룸의 객관적, 주관적 사용성에 정보적, 정서적 효과를 줄 수 있는지 살펴보았다. 무음조건, 소리 조건, 음악 조건에 대하여 실험 1, 2에서 각각 김치냉장고, 에어컨 리모컨을 프로트타임으로 제작으로 실험 참가자들은 준비된 과제를 시행하였고, 과제수행 결과 및 주관적인 만족도를 통해 기술하도록 하였다. 결과 실험1, 2 모두 객관적인 과제 수행에 있어서 유의미한 향상이 나오지는 않았으나 지각된 사용서에 있어서는 무음 조건보다는 소리 조건이, 소리 조건보다는 음악조건이 더 높았다. 즉 음악의 사용자 인터페이스 적용은 과제 수행에 최소한 방해를 주지 않으면서 주관적인 만족을 향상시킬 수 있는 방안으로 결론지을 수 있다. 본 연구는 가전 제품 설계에 있어 정서적, 미적인 효과에 대한 기반을 제공하고 시각장애인을 위한 연구에 적응할 수 있을 것이다. 가전 제품의 수행 과제, 사용 맥락 및 환경, 제품에 맞는 음악의 속성 및 종류에 대한 체계적인 추후 연구가 이루어진다면 음악을 이용한 사용자 인터페이스에 대한 구체적인 가이드라인을 제공할 수 있을 것이다.

• Geomechanics and Engineering
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• 제17권2호
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• pp.119-131
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• 2019

Time dependent creep settlements are one of the most important causes of material deteriorations for the huge water structures such as concrete faced rockfill dams (CFRDs). For this reason, performing creep analyses of CFRDs is vital important for monitoring and evaluating of the future and safety of such dams. In this study, it is observed how changes viscoplastic behaviour of a CFR dam depending the time. Ilısu dam that is the longest concrete faced rockfill dam (1775 m) in the world is selected for the three dimensional (3D) analyses. 3D finite difference model of Ilısu dam is modelled using FLAC3D software based on the finite difference method. Two different special creep material models are considered in the numerical analyses. Wipp-creep viscoplastic material model and burger-creep viscoplastic material model were rarely used for the creep analyses of CFRDs in the last are taken into account for the concrete slab and rockfill materials-foundation, respectively. Moreover, interface elements are defined between the concrete slab-rockfill materials and rockfill materials-foundation to provide interaction condition for 3D model. Firstly, dam and foundation are collapsed under its self-weight and static behaviour of the dam is evaluated for the empty reservoir conditions. Then, reservoir water is modelled considering maximum water level of the dam and time-dependent creep analyses are performed for maximum reservoir condition. In this paper, maximum principal stresses, vertical-horizontal displacements and pore pressures that may occur on the dam body surface during 30 years (from 2017 to 2047) are evaluated in detail. According to numerical analyses, empty and maximum reservoir conditions of Ilısu dam are compared with each other in detail. 4 various nodal points are selected under the concrete slab to better seen viscoplastic behaviour changes of the dam and viscoplastic behaviour differences of these points during 30 years are graphically presented. It is clearly seen that horizontal-vertical displacements and principal stresses for maximum reservoir condition are more than the empty reservoir condition of the dam and significant pore pressures are observed during 30 years for maximum reservoir condition. In addition, horizontal-vertical displacements, principal stresses and pore pressures for 4 nodal points obviously increased until a certain time and changes decreased after this time.

• Interaction and multiscale mechanics
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• 제5권3호
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• pp.287-318
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• 2012

We apply a partitioned-solution (iterative-staggered) coupling method based on a fixed Eulerian mesh with the level set function to a large-deformation fluid-structure interaction (FSI) problem where a large-deformable thin structure moves in a high-speed flow field, as an airbag does during deployment. This method combines advanced fluid and structure solvers-specifically, the constrained interpolation profile finite element method (CIP-FEM) for fluid Eulerian mesh and large-deformable structural elements for Lagrangian structural mesh. We express the large-deformable interface as a zero isosurface by the level set function, and introduce virtual nodes with level sets and structural normal velocities to generate the level set function according to the large-deformable interfacial geometry and enforce the kinematic condition at the interface. The virtual nodes are located in the direction normal to the structural mesh. It is confirmed that application of the method to unfolded airbag deployment simulation shows the adequacy of the method.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2009년 춘계학술대회논문집
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• pp.355-362
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• 2009

Most material of engineering interest undergoes solidification process from liquid to solid state. Identifying the underlying mechanism during solidification process is essential to determine the microstructure of material which governs the physical properties of final product. In this paper, we expand our previous two-dimensional numerical technique to three-dimensional simulation for computing dendritic solidification process with fluid convection. We used Level Contour Reconstruction Method to track the moving liquid-solid interface and Sharp Interface Technique to correctly implement phase changing boundary condition. Three-dimensional results showed clear difference compared to two-dimensional simulation on tip growth rate and velocity.

• International Journal of Automotive Technology
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• 제3권4호
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• pp.157-163
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• 2002

It is well recognized that the ultrasonic method is one of the most common and reliable nondestructive testing (NDT) methods for the quantitative estimation of defects in welded structures. However, NDT techniques applying for adhesively bonded joints have not been clearly established yet. In this paper, the detection of interface crack by the ultrasonic method was applied for the measurement of interfacial crack length in the adhesively bonded joints of double-cantilever beam (DCB). An optimal condition of transmission coefficients and experimental accuracy by the ultrasonic method in the adhesively bonded joints have been investigated and discussed. The experimental values are in good agreement with the computed results by boundary element method (BEM) and Ripling's equation.

• 한국생산제조학회지
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• 제9권4호
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• pp.131-136
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• 2000

This study deals with the mechanical properties of STS304-Al351 friction welding zone. Main results are as follows ; under the condition of upset pressure 75MPa, the tensile strength of STS304-al6351 friction weld interface was higher than that of Al6351 base metal, and the highest tensile strength(290MPa) was obtained at upset pressure 125MPa. The hardness profile across the weld interface shows that the hardness of both STS304 and Al6351 is higher around the weld interface, and sharply increased hardness on the STS304 side is related with the plastic deformation of micro volume. As the result of analyzing the tensile fracture, it showed perfect soft fracture.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 1999년도 춘계종합학술대회
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• pp.411-414
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• 1999

70 ${\AA}$-thick oxides nitridied at various conditions were reoxidized at pemperatures of 900$^{\circ}C$ in dry-O$_2$ ambients for 5～40 mininutes. The gate oxide interface porperties as well as the oxide substrate interface properties of MOS(Metal Oxide Semiconductor) capacitors with various nitridation conditions, reoxidation conditions and pure oxidation condition were investigated. We stuided I$\sub$g/-V$\sub$g/ characteristics, $\Delta$V$\sub$g/ shift under constant current stress from electrical characteristics point of view and breakdown voltage from leakage current point of view of MOS capacitors with SiO$_2$, NO, RNO dielectrics. Overall, our experimental results show that reoxidized nitrided oxides show inproved charge trapping porperites, I$\sub$g/-V$\sub$g/ characteristics and gate $\Delta$V$\sub$g/ shift. It has also been shown that reoxidized nitridied oxide's leakage currented voltage is better than pure oxide's or nitrided oxide's from leakage current(1${\mu}$A) point of view.

• Korea-Australia Rheology Journal
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• 제16권4호
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• pp.219-226
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• 2004

In this study the deformation of liquid-air interface of Newtonian or Boger fluids filled between two par­allel-plates geometry was investigated when two surfaces were separated at a constant speed. The interface between the fluid and air showed either stable or unstable deformation depending on experimental con­ditions. Repeated experiments for a wide range of experimental conditions revealed that the deformation mode could be classified into three types: 'stable region', 'fingering' and 'cavitation'. The experimental condition for the mode of deformation was plotted in a capillary number vs. Deborah number phase plane. It has been found that the elasticity of Boger fluids destabilize the interface deformation. On the other hand, the elasticity suppresses the formation and growth of cavities.

• 대한기계학회논문집B
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• 제33권7호
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• pp.469-476
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• 2009

Most material of engineering interest undergoes solidification process from liquid state. Identifying the underlying mechanism during solidification process is essential to determine the microstructure of material thus the physical properties of final product. In this paper, effect of fluid convection on the dendrite solidification morphology is studied using Level Contour Reconstruction Method. Sharp interface technique is used to implement correct boundary condition for moving solid interface. The results showed good agreement with exact boundary integral solution and compared well with other numerical techniques. Effects of Peclet number and undercooling on growth of dendrite tip of both single and multiple seeds have been also investigated.