• Title/Summary/Keyword: 통합해석

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Blast Analysis of Concrete Structure using Arbitrary Lagrangian-Eulerian Technique (Arbitrary Lagrangian-Eulerian기법을 적용한 콘크리트 구조물의 폭발해석)

  • Yi, Na-Hyun;Kim, Sung-Bae;Nam, Jin-Won;Lee, Sung-Tae;Kim, Jang-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.269-272
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    • 2008
  • Blast load, an impulsive load with extremely short time duration with very high pressure, is effected by ground and air condition, weight of charge, shape and location of structure. In this study, a blast dynamic analysis for the air-structural integrated model considering dynamic properties of materials and simulation of complex blast wave propagation by Arbitrary Lagrangian- Eulerian technique is suggested to perform an accurate blast analysis of concrete structures. For the verification of the proposed blast analysis method, which is the air-structure integrated model using ALE technique, the comparison of analysis and experimental results is performed. The verification confirms that the simulation of realistic behavior of RC wall structures is possible using ALE method. Also, the example cases which have been analyzed using this method show that the estimation to the structural failure criterion for blast load failure can be represented by energy absorbtion procedure.

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해양사고 원인규명 통합 분석 시뮬레이션 시스템

  • Lee, Sang-Gap
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2016.05a
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    • pp.50-54
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    • 2016
  • 해양사고 원인규명 통합 분석 시뮬레이션 시스템은 해양사고가 발생하는 과정(선회)을 포함하여 충돌, 좌초, 접촉, 전복, 침수 및 침몰 등의 해양사고를 유체-구조 연성 해석기법의 고도 정밀 M&S 시스템을 사용하여 과학적으로 해양사고의 원인을 분석하고 사고의 손상과정을 체계적으로 재현할 수 있는 시스템이다. 해양사고는 육상과 공중에서 발생하는 자동차와 비행기 등의 충돌이나 추락사고와는 달리 공기의 밀도보다 천배의 물에서 발생하므로 물에서 부양되고, 운동하고, 선내에 물이 침수되고, 운항 중일 때 파도도 생성시키고, 두 물체가 근접할 경우에는 압력이 압착되고, 두 물체가 스쳐 지나거나 안벽이나 해저를 근접하여 운항할 경우에는 압력이 저하되는 등 물에서의 연성효과(interface effect)를 충분히 고려하여 재현할 수 있어야 정확하게 해양사고의 원인을 규명 및 분석할 수 있을 것이다. 또한 황천에서 발생하는 해양사고일 경우에는 강한 조루, 강풍 및 해일성 파도 등을 불규칙 스펙트럼을 사용하여 정확히 구현하여야 황천에서 발생하는 해양사고의 원인을 충분히 분석할 수 있을 것이다. 이러한 해양사고 통합 분석 시뮬레이션 시스템을 이용하여 과학적이고 정확한 해양사고의 원인규명 및 분석으로 심판의 획기적인 신뢰 구축과 심판 지연에 따른 사회적 비용을 최소화하고, 해양사고의 원인과 과실 책임, 나아가서 사고 재발방지 대책수립 등에도 활용하는데도 크게 기여할 것으로 사료된다.

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Development of Analysis Technique for a High Voltage Circuit Breaker Using the CFD-CAD Integration (CFD-CAD 통합해석을 이용한 초고압 가스차단기 설계 기술 개발)

  • Lee, J.C.;Oh, I.S.;Min, K.S.;Kim, Y.J.
    • Proceedings of the KSME Conference
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    • 2001.11b
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    • pp.523-528
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    • 2001
  • There are many difficult problems in analyzing the flow characteristics in a high voltage circuit breaker such as shock wave and complex geometries, which may be either static or in relative motion. Although a variety of mesh generation techniques are now available, the generation of meshes around complicated, multicomponent geometries like a gas circuit breaker is still a tedious and difficult task for the computational fluid dynamics. This paper presents the computational method for analyzing the compressible flow fields in a high voltage gas circuit breaker using the Cartesian cut-cell method based on the CFD-CAD integration, which can achieve the accurate representation of the geometry designed by a CAD tools. The technique is frequently satisfied, and it will be almost universally so in the future, as the CFD-CAD traffic increases.

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Development of Integrated Model of Boiler and Its Supporting Steel Structure of Coal-Fired Power Plant for Finite Element Analysis (유한요소해석을 위한 석탄화력발전소의 보일러와 지지 철골의 통합모델 개발)

  • Lee, Boo-Youn
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.4
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    • pp.9-19
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    • 2020
  • An integrated finite element model composed of a boiler and its supporting steel structure for a 375-MW coal-fired power plant was developed. This study used the developed model for seismic analysis using SAP2000 software. For the complex superheaters, reheaters, economizers, and membrane walls of the boiler, which consisted of numerous tubes, a method of modeling them by the equivalent elements in the viewpoint of stiffness and/or inertia was proposed. In addition, a method of modeling for the connection between the boiler and steel structure was proposed. Many hangers that connect the boiler to the girders of a steel structure were transformed into equivalent hangers by decreasing the number. The displacements of the boiler stoppers on the buckstay and the posts of the steel structure were coupled by considering their interface condition. Static analysis under the self-loading condition for the developed integrated model was implemented, and the results of deformation indicated that the behavior of the steel members and the major components of the boiler were appropriate. In conclusion, the integrated model developed in this study can be used to evaluate the safety of the boiler and steel structure under seismic loads.

Quantile Regression-based regional frequency analysis techniques (Quantile-regression-based 지역빈도해석 기법)

  • Kang, Subin;Uranchimeg, Sumiya;Moon, Jangwon;Kwon, Hyun-Han
    • Proceedings of the Korea Water Resources Association Conference
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    • 2022.05a
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    • pp.404-404
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    • 2022
  • 효율적인 수자원 관리를 위해 빈도해석을 통한 수문 자료의 통계적 특성을 고려하여 정확한 확률강수량을 산정해야 한다. 지점빈도해석은 지점 자료만을 이용하여 확률강수량을 산정하기 때문에 정확도를 높이기 위해서는 자료 확충이 필요하지만, 지점별로 활용할 수 있는 자료가 제한적이며 지점마다 변동성이 크다. 지역빈도해석은 수문기상학적으로 동질한 주변 지점들의 자료를 모두 포함해서 빈도해석을 수행함으로써 지역에 대한 통합 결과를 제시하고 자료에 대한 신뢰성 확보가 가능하다. 일반적으로 빈도해석은 자료에 적합한 확률분포 기반으로 수행되지만 확률분포 선정과정에 따라 결과는 상이하다. 본 연구에서는 지역빈도해석에서 확률강수량 산정방법으로 Quantile Regression(QR)을 적용하였다. QR 기반의 빈도해석은 확률분포 아니라 자료 자체로 확률강수량을 산정하여 기존의 확률분포 기반의 빈도해석에서 발생했던 불확실성을 개선하였다. 또는, 확률강수량의 시간에 따른 변동성도 고려되어 바정상성 빈도해석도 가능하다. 최종적으로 본 연구에서 소개된 지역빈도해석 결과와 기존의 지역빈도해석 결과 비교 검증하였다.

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GIS-based Spatial Integration and Statistical Analysis using Multiple Geoscience Data Sets : A Case Study for Mineral Potential Mapping (다중 지구과학자료를 이용한 GIS 기반 공간통합과 통계량 분석 : 광물 부존 예상도 작성을 위한 사례 연구)

  • 이기원;박노욱;권병두;지광훈
    • Korean Journal of Remote Sensing
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    • v.15 no.2
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    • pp.91-105
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    • 1999
  • Spatial data integration using multiple geo-based data sets has been regarded as one of the primary GIS application issues. As for this issue, several integration schemes have been developed as the perspectives of mathematical geology or geo-mathematics. However, research-based approaches for statistical/quantitative assessments between integrated layer and input layers are not fully considered yet. Related to this niche point, in this study, spatial data integration using multiple geoscientific data sets by known integration algorithms was primarily performed. For spatial integration by using raster-based GIS functionality, geological, geochemical, geophysical data sets, DEM-driven data sets and remotely sensed imagery data sets from the Ogdong area were utilized for geological thematic mapping related by mineral potential mapping. In addition, statistical/quantitative information extraction with respective to relationships among used data sets and/or between each data set and integrated layer was carried out, with the scope of multiple data fusion and schematic statistical assessment methodology. As for the spatial integration scheme, certainty factor (CF) estimation and principal component analysis (PCA) were applied. However, this study was not aimed at direct comparison of both methodologies; whereas, for the statistical/quantitative assessment between integrated layer and input layers, some statistical methodologies based on contingency table were focused. Especially, for the bias reduction, jackknife technique was also applied in PCA-based spatial integration. Through the statistic analyses with respect to the integration information in this case study, new information for relationships of integrated layer and input layers was extracted. In addition, influence effects of input data sets with respect to integrated layer were assessed. This kind of approach provides a decision-making information in the viewpoint of GIS and is also exploratory data analysis in conjunction with GIS and geoscientific application, especially handing spatial integration or data fusion with complex variable data sets.

The Effects of Attitudes toward Disabled Children on Integrated Childcare Attitudes in Regular Parents (일반학부모의 장애아에 대한 태도가 통합보육태도에 미치는 영향)

  • Kang, Young-Sik
    • Proceedings of the KAIS Fall Conference
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    • 2012.05a
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    • pp.141-144
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    • 2012
  • 본 연구는 일반학부모의 장애아에 대한 태도가 통합보육태도에 미치는 영향을 알아보는데 목적을 갖고, 2012년 3월 2일부터 10일까지 J지역 소재 통합보육시설에 다니고 있는 일반 자녀를 둔 학부모 150명을 대상으로 설문조사하였는데 그 결과를 요약하면 다음과 같다. 첫째, 장애아에 대한 태도가 통합보육 일반 태도에 미치는 영향을 검증한 결과 인지적, 감정적 요소가 일반 태도에 통계적으로 유의한 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 장애아에 대한 태도가 통합보육 유아활동 및 교사관심에 미치는 영향을 검증한 결과 인지적, 행동적 요소가 유아활동 및 교사관심에 통계적으로 유의한 정(+)의 영향을 미치는 것으로 나타났다. 셋째, 장애아에 대한 태도가 통합보육 행동문제에 미치는 영향을 검증한 결과 인지적, 감정적, 행동적 요소가 행동문제에 통계적으로 유의한 정(+)의 영향을 미치는 것으로 나타났다. 이상의 연구결과를 종합해 보면 일반학부모의 장애아에 대한 태도에 따라 통합보육 태도에 차이가 있음을 알 수 있다. 이는 일반학부모의 장애아에 대한 인지적, 감정적 요소에서 차이를 보여 이들 요인의 인식 개선시 통합보육태도를 높이는 긍정적인 요소로 작용할 수 있음을 시사한 것으로 볼 수 있다. 이 같은 결과는 통합보육이 장애유아와 일반유아 모두가 서로의 다양성을 인정하며, 이질적인 상대의 존재를 받아들이고, 존중하며 함께 배우려는 학부모의 인식전환이 선행되어져야 할 것을 시사한 것으로 해석할 수 있다.

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Integrated Surface-Groundwater Hydrologic Analysis for Evaluating Effectiveness of Groundwater Dam in Ssangcheon Watershed (쌍천 지하댐의 효용성 평가를 위한 지표수-지하수 통합 수문해석)

  • Kim, Nam-Won;Na, Han-Na;Chung, Il-Moon
    • Economic and Environmental Geology
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    • v.44 no.6
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    • pp.525-532
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    • 2011
  • In this study, the usefulness of underground dam as a means for the sustainable development of groundwater, and its performance in the management of groundwater resources were analyzed. The fully integrated SWAT-MODFLOW was applied to the Ssangcheon watershed in Korea to evaluate the effectiveness of groundwater dam construction. After construction, the groundwater level raised in the upstream area of groundwater dam while lowered in the downstream area. Also, it is shown that the exchange rate of river-aquifer interactions increased in the upper area of the dam. Since the storage capacity of the aquifer largely increased in the upper area of the dam, the exploitable groundwater could be greatly increased as much. This study demonstrated that a groundwater dam was a very useful measure to increase the available storativity of groundwater aquifers. It also represented that the combined analysis using SWAT-MODFLOW was helpful for the design and opeation of groundwater dam in the Ssangcheon watershed.

A Study on the Structural Optimization for CAD/CAE Integration (CAD/CAE 통합을 위한 구조설계 최적화에 관한 연구)

  • Park, Chang-Kue;Yang, Young-Soon;Ruy, Won-Son;Jang, Beom-Seon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.2
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    • pp.127-134
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    • 2009
  • In product development, CAD and CAE systems taking part in the design process were individually developed. Furthermore, in product development, different divisions and businesses often have heterogeneous CAD/CAE systems and methods for expressing product data, and addressing this heterogeneity creates additional costs and causes longer development periods. To ensure successful collaboration in the design process, it is therefore imperative that different CAD, CAE, and other related systems be managed in an organic and integrated manner from the initial stages of product development. Therefore, this study suggests an integrated CAD/CAE system including optimization in a more effective and integrated manner but also to support interfacing and the collective use of design and analysis tools. To validate the proposed method, a stiffened plate example is taken as an example. It is found that the proposed method could overcome the bottleneck of CAD and CAE such as transferability of data, though CATIA and ANSYS are used at the moment. Besides, carrying out an optimization process during the CAE process is another essential parts for the structural optimization process.