• Proceedings of the Korean Operations and Management Science Society Conference
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• 1994.04a
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• pp.367-369
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• 1994

지금까지 다구치 방법에서는 다특성치 문제에 있어서 특성치들 간의 관계를 무시하고 특성치들은 서로 독립이라는 가정 하에, 각 특성치에 대한 최적공 정조건을 찾아 다특성치로 확장시키는 방법이 사용되었다. 그러나 현실적으 로 많은 다특성치 문제에서 특성치들 간의 상관관계가 존재한다. 따라서 본 연구에서는 특성치들 간의 상관관계를 고려한 새로운 평가척도를 제시하고 자 한다. 본 연구에서는 각 특성치와 특성치들 간의 상관관계에 가중치를 부 여하는 방법을 사용하였다. 다특성치 손실함수를 단일 특성치 종류의 조합에 따라 여섯개의 모형으로 구분하였고, 각 모형의 다특성치 손실함수는 특성치 자체에 의해 야기되는 손실과 특성치들간의 관계에 의해 야기되는 손실로 나누었다. 또한 새로운 평가척도로는 다특성치 손실함수의 각 항에 의해 야 기되는 기대손실의 합인 다특성치의 기대손실을 선택하였다. 본 연구의 타당 성에 대해서는 기존의 데이터를 이용. 분석하여 기존 논문과 비교하였다.

• KDI Journal of Economic Policy
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• v.11 no.2
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• pp.89-97
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• 1989

본고(本稿)의 목적(目的)은 현재 우리나라 신규(新規)아파트분양시장(分讓市場)에서 실시되고 있는 가격규제(價格規制), 특히 최고가격제(最高價格制) 채권입찰제(債券入札制) 아래서 수요(需要)의 가격탄성치(價格彈性値)를 계측(計測)해 보는 데 있다. 계측결과(計測結果) 중 흥미로운 것은, 첫째 분양가를 기준으로 계측한 평형별(坪型別) 가격탄성치(價格彈性値)가 대부분이고 2.5~3.5 사이의 수치(數値)를 일관성있게 보여 신규아파트 분양수요가 가격에 대단히 탄력적이고, 둘째 평형별(坪型別) 군별(群別) 신규(新規)아파트 수요(需要)의 가격탄성치(價格彈性値)는 2군(群)이 1군(群)보다 절대값에서 작은 수치를 보여주었으며, 셋째 아파트 가격이 상승함에 따라 절대값으로 표시한 가격탄성치(價格彈性値)가 처음에는 커져다가 점점 작아지는 것으로 보아 수요곡선이 완만한 L형을 나타낼 것이라는 점이다.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.914-918
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• 2012

본 연구는 유역의 침수특성치를 기준으로 하여 치수계획규모를 설정하는 방법을 연구한 것이다. 본 연구에서는 2010년 9월 21일 광화문 일대에 발생한 침수피해를 이용하여 XP-SWMM 2010 모형을 검증한 후 침수예상도를 산정하였다. 확률강우량은 Huff의 4분위법으로 분포시켰으며, 침수특성치(관로첨두유출량, 평균침수심, 특정지점의 최대침수심, 최대침수면적, 침수총량, 특정지점의 침수지속시간)를 기준한 유역치수계획규모를 설정하는 새로운 방법을 제시하였다. 모의 결과 출구점에서의 첨두유출량은 각 빈도별 최대값/최소값이 1.11~1.22로 거의 동일하게 구해지는 반면, 평균침수심, 특정지점의 최대침수심, 최대침수면적, 침수총량, 특정지점의 침수지속시간 등의 침수특성치는 1.59~7.44로 큰 차이를 보였다. 이와 같은 결과로, 유역 내에 발생하는 침수피해규모를 통한 임계지속시간이 계획규모설정에 더욱 적합하다 판단하였다.

• Journal of the Korean Geotechnical Society
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• v.19 no.2
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• pp.179-187
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• 2003

Vertical reinforcement of soft ground using granular column is a very effective ground improvement technique which is being used fur increasing bearing capacity and decreasing settlement. In this study, the theories of elasticity and plasticity including the upper bound theorem of limit analysis were used to derive the equations for obtaining elastic properties and shear strength parameter of equivalent ground of composite foundation. The developed equations were verified using the finite element computer program, SAGE CRISP. For validation, finite element analyses were conducted f3r the various different cases including different type of soil and replacement ratios. The results of the analysis show that the proposed equation could determine the properties of equivalent ground material for practical application effectively.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.3
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• pp.957-964
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• 2013

This research is on the methodology of flood risk assessment using flooding characteristic values. Necessity of design magnitude for flood control considering floods was judged by plotting peak flow with respect to frequency and duration, and flooding magnitude was defined with 6 flooding characteristic values which were proposed to be significant factors when assessing flooding magnitude. Precipitation data used in the assessment modeling were applied by combining all the possible precipitation events. After overlapping the simulated results with precipitation matrix by flooding characteristic values, contour map was drawn, and Flooding characteristic contour graph for possible rainfall events were suggested in respect of all possible precipitation. Flooding characteristic contour graph for possible rainfall events was confirmed that reducing of damage magnitude of each flood characteristic value was figured out easily. The flood risk assessment methods suggested in this study would be a good reference for urban drainage system design, which only focuses on pipe conduit.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.19 no.3 s.73
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• pp.247-258
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• 2006

For the perforated cylindrical shell submerged in fluid, it is almost impossible to develop a finite element model due to the necessity of the fine meshing of the shell and the fluid at the same time. This necessitates the use of solid shell with equivalent material properties. Unfortunately the effective elastic constants are not found in any references even though the ASME code is suggesting those for perforated plate. Therefore in this study the equivalent material properties of perforated shell are suggested by performing several finite element analyses with respect to the ligament efficiencies.

• Journal of the Korea Society of Computer and Information
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• v.12 no.4
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• pp.201-207
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• 2007

In some manufacturing industries, there are many situation in which the simultaneous monitoring or control of two or more related quality characteristics is necessary. However, monitoring these two or more related quality characteristics independently can be very misleading. When several characteristics of manufactured component are to be monitored simultaneously, multivariate $x^2$ or $T^2$ control chart can be used. In this paper, establishing a early warning system(EWS) using multivariate control charts to analyze early out-of-control signals in melting process with many quality characteristics was presented. This module which we developed to control several characteristics improved efficiency and effectiveness of process control in the melting process.

• Transactions of the Korean Society of Mechanical Engineers
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• v.15 no.5
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• pp.1479-1485
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• 1991

본 연구에서는 고차판이론(higher order shear deformable plate theory)을 사용하여 DCB시편을 보형상이 아닌 실제의 얇은 판으로 해석하여 새로운 에너지해방률 식을 제시하고자 한다.한편, 이의 타당성을 입증하기 위하여 Gr/Ep 및 APC-2 복합 재료로 ASTM D30.02 round robin의 제안 방법에 의해 층간파괴인성치를 구하고, 또 이 강용이 제안한 Ae법에 의한 금속의 파괴인성치 결정법을 참고로 하여 미세파괴 초창기 의 층간파괴인성치를 결정하여 이론결과와 비교 검토한다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.6 no.2
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• pp.263-275
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• 2002

In general, the values of shear strength properties of rubble stones have been given quoting from Japanese empirical recommendation when breakwater and offshore structures of port and harbor facilities were designed in Korea. but by large-scale triaxial test(specimen diameter 30cm, specimen height 60cm) carried out in Korean Water Resources Corporation in 2001, for the first time in korea, shear strength properties of rubble stones are evaluated directly. These are compared with the Japanese empirical recommendation. Therefore, the value of shear strength properties of rubble stones have been usually given quoting from Japanese empirical recommendation without laboratory or in-situ tests, but the results of this study state that shear strength properties of rubble stone can be rationally determined and shear behavior characteristics of rubble stone can be invesgated by large-scale triaxial test

• Journal of Korea Water Resources Association
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• v.45 no.10
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• pp.1035-1041
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• 2012

This paper is on the decision of design magnitude for flood control of urban basin, based on flooding characteristic values. In Korea, a design magnitude for flood control is established based on peak discharge of the outlet of basin. However, this method is inappropriate in an urban basin because sewerage only can flow out as much as it could and other discharge overflow to basin. In order to calculate a design magnitude for flood control of an urban basin, flooding characteristic values (peak discharge of pipe, average flooded depth, maximum flooded depths of an important point, flooded area, flooded volume, flooded time) were used as a tool. Using the Gwanghwamun Square as an example, a methodology was proposed that used XP-SWMM 2010 model as a platform to predict urban flood disaster. It can help other local government and residents to better understand, prepare for and manage a flood in urban environments.