• 지질공학
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• 제17권3호
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• pp.425-434
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• 2007

본 연구에서는 석분슬러지 혼합토를 복구토로 활용할 경우 조성되는 매립사면의 안정성 기준을 마련하였다. 이를 위하여 먼저 석분슬러지와 원지반토의 혼합비율을 5가지로 구분하고 각각에 대한 토질시험을 실시하였다. 실험결과 석분슬러지의 혼합비율이 감소할수록 전단강도 및 최대건조단위중량이 증가하는 경향을 나타내었다. 성토사면에 대한 국내외의 사면안전율 기준에 대한 조사를 토대로 석분슬러지 혼합토 매립사면의 사면안정등급을 불안정, 주의 및 안정의 3단계로 구분하였다. 석분슬러지 혼합토 매립사면에 대한 사면안정해석을 실시하여 안전한 사면높이, 사면경사 및 석분슬러지 혼합비율을 제안하였다. 매립사면에 대한 사면안정해석결과 석분슬러지 혼합토 성토사면의 사면높이를 10 m로 할 경우 사면경사는 1 : 1.8 이상 되도록 매립하여야 안정함을 알 수 있다. 그리고 사면높이를 15 m로 할 경우 석분슬러지 함유율이 50%이하로 하고 사면경사는 1 : 1.8 이상 되도록 매립하여야 안정함을 알 수 있다. 사면경사, 사면높이 및 석분슬러지 함유율이 동일한 조건일 경우 채석현장 내부의 절취암반에 접하여 매립된 사면과 평지에 성토하여 매립된 사면의 사면안정해석결과는 유사함을 알 수 있다. 이와 같은 석분슬러지 혼합토 매립사면의 안정성 기준은 채석현장에서 실무적으로 이용할 수 있을 것으로 판단된다.

• 국제초고층학회논문집
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• 제12권1호
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• pp.83-91
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• 2023

Under the dual pressure of population growth and land shortage, threedimensional development is the inevitable choice for cities in China. In such a scenario, a mixed-use complex has considerable potential in its realization and research. Based on space syntax and the three-dimensional visibility graph analysis, this paper describes the spatial and functional layout of the Shanghai Super Brand Mall and studies the relationship between spatial visibility and user behaviour through linear regression analysis and correlation analysis. This paper studies three different types of user behaviour, namely, path selection, staying selection, and store selection, and finds that spatial visibility and accessibility have different effects on user behaviour depending on the type and purpose of the activity. This paper reveals the influence of spatial and functional layout on user behaviour and puts forward the corresponding design strategy under the three-dimensional environment.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제19권1호
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• pp.47-60
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• 2016

본 연구는 수학교육에서 혼합 연구방법(양적 연구방법과 질적 연구방법을 혼합한)을 활용한 연구에서 질적 연구 방법이 어떻게 적용되고 있는지를 분석하고, 질적 접근의 적용이 연구 목적 성취에 기여할 수 있는 시사점을 탐색하고 논의하고자 한다. 이러한 연구 목적을 달성하기 위하여, 본 연구에서는 한국수학교육학회의 초등수학교육 학회지에 2012년 게재된 전체 16편의 논문 중, 혼합 연구법을 활용한 논문 5편을 분석 대상으로 선정하였다. 비교 항목별 분석 결과를 양화된 수치로 간략하게 제시하던 기존의 혼합 연구물에 대한 분석 연구와는 달리, 본 연구는 질적 연구자의 관점에서, 자료 수집 및 자료 분석 방법, 연구 참여자 및 샘플링 선정 등을 중심으로 심도 있게 분석하여 그 결과와 시사점을 질적으로 제시하고 있다.

• 설비공학논문집
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• 제26권9호
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• pp.424-433
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• 2014

The purpose of this study is to evaluate the effectiveness in the lighting performance of mixed type light-shelf, by comparing and analyzing the internal light-shelf, external light-shelf, and mixed-type light-shelf. The performance of light-shelf was evaluated according to the angle of light-shelf at summer solstice, winter solstice, vernal equinox, and autumn equinox. The comparative analysis between the internal light-shelf, external light-shelf, and mixed-type light-shelf was carried out using the performance evaluation and analysis method. The result of performance evaluation is shown as follows. The mixed type light-shelf showed the highest lighting performance all at summer solstice, winter solstice, vernal equinox, and autumn equinox, followed by the external light-shelf and the internal light-shelf in the same order. The mixed type light-shelf was the most favorable for bringing daylight to indoors by adjusting the angle of light-shelf, and it also showed the highest lighting performance in terms of uniformity ratio of illumination which indicates the quality of light.

• 대한기계학회논문집A
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• 제31권4호
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• pp.432-440
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• 2007

In this study, we have investigated the closure behavior of fatigue cracks in SAPH440 steel plates under a mixed-mode I+II loading. A crack image capturing system as a direct measuring method was used to measure the closure levels at a crack tip. The crack closure levels in the fluctuation and stable sections were increased with the increase of the mode mixture ratio. The mode mixture ratio independent fatigue crack propagation rates equation was calculated by considering mixed-mode crack closure levels. The equation was examined according to the application method of crack opening ratio. The fracture surface analysis by C-scan method was also performed in order to investigate the closure mechanism and propagation mode of crack under the mixed-mode I+II loading. The crack closure under the mixed mode I+II is confirmed as a surface roughness closure by the quantitative analysis of fracture surface using the proposed surface roughness parameter.

• 호남수학학술지
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• 제42권1호
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• pp.17-35
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• 2020

In this paper we introduce and consider a new class of variational inequalities with four operators. This class is called the extended general mixed quasi variational inequality. We show that the extended general mixed quasi variational inequality is equivalent to the fixed point problem. We use this alternative equivalent formulation to discuss the existence of a solution of extended general mixed quasi variational inequality and also develop several iterative methods for solving extended general mixed quasi variational inequality and its variant forms. We consider the convergence analysis of the proposed iterative methods under appropriate conditions. We also introduce a new class of resolvent equation, which is called the extended general implicit resolvent equation and establish an equivalent relation between the extended general implicit resolvent equation and the extended general mixed quasi variational inequality. Some special cases are also discussed.

• 교육시설
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• 제16권1호
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• pp.69-77
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• 2009

This study, as one of the specific suggestions to satisfy the social needs of life long education and to overcome the limitations of the supply of regional facilities, presents plans for the possibility of the mixed-use of educational facilities and regional facilities as the ultimate objective. By focusing on the space composition of the mixed-use facility to execute the roles of the educational establishment actively and efficiently, the purpose is to present the mixed-use methodology in architectural plan on which functions to combine and by how much, when the mixed-use plan of educational facilities. The investigation objects was the 27 elementary schools in Seoul which have undergone mixed-use of educational facilities work as at August, 2007. And each educational facility was classified mixed-use functions and analyzed for the composition form of functions and the characteristics by functions. And for mixed-use facility, form types were derived from the relationship with the school buildings through the analysis on characteristics, strengths and weaknesses of each types were presented by factor-by-factor plan directions of mixed-use facility.

• 대한수학회지
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• 제44권4호
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• pp.889-902
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• 2007

An existence theorem for a new class of parametric generalized mixed implicit quasi-variational inclusion problems is established in Hilbert spaces. Further, we study the behavior and sensitivity analysis of the solution set in this class of parametric variational inclusion problems.

• Journal of Advanced Marine Engineering and Technology
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• 제28권3호
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• pp.509-515
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• 2004

The PIV(Particle Image Velocimetry) with liquid crystal tracers is used for visualizing and analysis of the mixed convection in the parallel plates with the upper part cooled and the lower part heated. It is found that the flow pattern of mixed convection in the parallel plates can be classified into three patterns which was affected by Reynolds number. Also, the periodic nature is confirmed, and visualized in experiment.

• 대한치과보철학회지
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• 제30권2호
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• pp.135-154
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• 1992

This study was performed to analyze bond strength, the alterations of the interfaces between metal films which are populary used and considered to contribute to the chemical reaction with porcelain, according to constant ion- beam- mixing, and the relation between interfacial chemical reactions and bond strength in metal/porcelain specimens. For this study, three seperate metals : selected-gold, indium and tin were chosen ; each to be bonded to a seperate body porcelain. Bonding occurs when the metal is deposited to the body porcelain using a vacuum evaporator. The vacuum evaporator used $10^{-5}\sim10^{-6}$ Torr vacuum states for the evaporation of various metals (Au, Sn, In). Ion-beam-mixing of the porcelain/metal interfaces caused reactions when the Ar+ was implanted into thin films using a 80 KeV accelerator. These ion-beam-mixed specimens were then compared with an unmixed control group. An analysis of bond strength and ionic changes between the the metal and porcelain was performed by electron spectroscopy of chemical analysis (ESCA) and scratch test. The finding led to the following conclusions : 1. Light microscopic views of the scratch test : The ion-beam-mixed Au/porcelain specimen showed narrower scratched streams than the unmixed specimen. However, the Sn/porcelain, In/porcelain specimens showed no differences in the two conditions. 2. Acoustic emissions in scratch tests : The ion-mixed Au/porcelain, In/porcelain specimens showed signals closer to the metal/porcelain interfaces than unmixed specimens. Conversely, the ion-mixed Sn/porcelain specimen showed more critical signals in superficial portions than unmixed specimens. 3. After ion- beam-mixing, the Au/porcelain specimen showed apparently increased bond strength, and the In/porcelain specimen showed very slightly increased bond strength. However, the Sn/porcelain specimen showed no differences between ion mixed specimen and the unmixed one. 4. ESCA analysis : The ion-beam-mixed Au/porcelain specimen showed a higher peak separated value (4.3eV) than that of the unmixed specimen(3.65eV), the ion-beam-mixed In/porcelain specimen showed a higher peak separated value (9.43eV) than that of the unmixed specimen(7.6eV) and the ion-beam-mixed Sn/porcelain specimen showed a higher peak separated value (8.79eV) than that of the unmixed specimen(8.5eV). 5. Interfacial changes were observed in the ion-mixed Au/porcelain, In/porcelain and Sn/porcelain specimens. Especially, significant interfacial changes were measured in the ion- mixed Sn/porcelain specimen. Tin dioxide(SnO2) and a combination of pure tin and tin dioxide (Sn+SnO2) were produced. 6. In the Au/porcelain specimen, the interfacial chemical reaction showed increased bond strength between gold and porcelain substrate. But, in the In/porcelain, Sn/porcelain specimens, interfacial chemical reactions did not affected the bond strength between metal and porcelain substrate. Especially, bonding strength on the ion mixed Sn/porcelain specimen showed the least amount of difference.