• 한국콘텐츠학회논문지
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• 제2권2호
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• pp.103-111
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• 2002

비록 MIN이 짧은 직경을 갖고 있을지라도 지역화된 통신 형태를 갖는 병렬응용 프로그램에 있어서 hypercube와 fee구조를 비교했을 때 전체적인 시스템 성능은 떨어지게 된다. 그것은 MIN이 지역참조성의 활용할 수 있는 클러스터링 구조를 제공하는 것이 불가능하기 때문이다. 그러나 제안된 MIN은 잦은 데이터 통신 형태를 갖는 프로세서-메모리 클러스터의 내부에 짧은 경로 및 다중 경로를 제공하여 지역화된 통신 구조에 적합하도록 구성할 수 있다. 따라서 제안된 MIN은 지역화된 통신 형태를 갖는 병렬 응용 프로그램에 있어서 향상된 성능을 이룰 수 있게 된다.

• Smart Structures and Systems
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• 제12권6호
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• pp.641-659
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• 2013

In this paper is studied the influence of the uncertain mass distribution over the floors on the choice of the optimal parameters of a hybrid control system for tall buildings subjected to wind load. In particular, an optimization procedure is developed for the robust design of a hybrid control system that is based on an enhanced Monte Carlo simulation technique and the genetic algorithm. The large computational effort inherent in the use of a MC-based procedure is reduced by the employment of the Latin Hypercube Sampling. With reference to a tall building modeled as a multi degrees of freedom system, several numerical analyses are carried out varying the parameters influencing the floors' masses, like the coefficient of variation of the distribution and the correlation between the floors' masses. The procedure allows to obtain optimal designs of the control system that are robust with respect to the uncertainties on the distribution of the dead and live loads.

• 응용통계연구
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• 제13권2호
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• pp.477-488
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• 2000

전산실험계획으로 유용하게 쓰이는 라틴-하이퍼큐브 계획간의 거리를 정의하고 그 기대값을 계산하였다. 이 계산을 위해서 차원이 증가함에 따라 수리 통계학적 방법, 수치 해석적 방법(다차원 수치 적분법), 몬테카를로 적분 방법, 극한 정규분포이론을 이용하여 거리의 기대값을 구했다. 또한 같은 구조를 가지면서 랜덤성에 차이가 있는 두 라틴-하이퍼큐브 계획 간에 반응함수의 평균에서의 차이 및 정보량의 차이를 다루었다. 본 논문에서 제시한 두 Lhd들간의 비교 기법은 두 개의 일반 실험계획의 비교에도 유용하리라 여겨진다.

• Water Engineering Research
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• 제3권4호
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• pp.215-234
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• 2002

Uncertainty in dam breach flood routing results was analyzed in order to provide the basis fer the investigation of their effects on the flood damage assessments and dam safety risk assessments. The Monte Carlo simulation based on Latin Hypercube Sampling technique was used to generate random values for two uncertain input parameters (i.e., dam breach parameters and Manning's n roughness coefficients) of a dam breach flood routing analysis model. The flood routing results without considering the uncertainty in two input parameters were compared with those with considering the uncertainty. This paper showed that dam breach flood routing results heavily depend on the two uncertain input parameters. This study indicated that the flood damage assessments in the downstream areas can be critical if uncertainty in dam breach flood routing results are considered in a reasonable manner.

• 전자공학회논문지SC
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• 제37권2호
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• pp.1-7
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• 2000

본 논문에서는 입-출력 모델로 표현되는 SISO(Single-Input-Single-Output) 비선형 시스템의 적응제어 기법을 제시한다. 시스템에 포함된 미지의 파라미터는 알고 있는 콤펙트(compact) 볼록(convex) 집합 내에 있다고 가정한다. 기존의 결과와는 달리 이 집합은 원점을 포함하는 원이나 초입방체(hypercube)를 포함한 임의의 콤펙트 볼록 집합이 될 수 있다. 제시하는 갱신(update) 법칙으로 얻어지는 파라미터 추정치는 항상 알고 있는 집합 내에 존재하며 이를 이용한 제어 입력을 적용하면 시스템의 출력과 원하는 신호와의 위치, 속도, 그리고 가속도 오차가 시간에 따라 영으로 수렴함을 이론적으로 그리고 시뮬레이션을 통하여 입증한다.

• 한국유체기계학회 논문집
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• 제10권3호
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• pp.39-46
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• 2007

This study presents a numerical procedure to optimize the shape of staggered dimple surface to enhance turbulent heat transfer in a rectangular channel. The RBNN method is used as an optimization technique with Reynolds-averaged Navier-Stokes analysis of fluid flow and heat transfer with shear stress transport (SST) turbulence model. The dimple depth-to-dimple print diameter (d/D), channel height-to-dimple print diameter ratio (H/D), and dimple print diameter-to-pitch ratio (D/S) are chosen as design variables. The objective function is defined as a linear combination of heat transfer related term and friction loss related term with a weighting factor. Latin Hypercube Sampling (LHS) is used to determine the training points as a mean of the design of experiment. The optimum shape shows remarkable performance in comparison with a reference shape.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 학술대회
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• pp.229-232
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• 2008

This study presents a numerical procedure to optimize the shape of stepped circular pin-fins to enhance turbulent heat transfer. The KRG method is used as an optimization technique with Reynolds-averaged Navier-Stokes analysis of fluid flow and heat transfer with shear stress transport turbulent model. The objective function is defined as a linear combination of heat transfer and friction loss related terms with a weighting factor. Ten training points are obtained by Latin Hypercube Sampling for two design variables. Optimum shape has been successfully obtained with the increased objective function.

• 한국기계가공학회지
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• 제14권3호
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• pp.85-91
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• 2015

The press-fit shaft is an important part used in automobiles, vessels, and trains. This study proposes an optimized design method to reduce damage that may occur in the press-fitted shaft by modifying the shape of the boss step of the press-fitted shaft. To reduce the time and cost of running the optimized design method, an approximate design optimization is applied and an optimized algorithm is generated using a genetic algorithm that is widely used in engineering fields and an approximate model using a response surface method. The planned experiments for the data that are needed to generate the approximate model use a central composite design (CCD) and Latin hypercube sampling (LHS), and the results of the approximate optimization using the above two design of experiments are to be compared.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년 추계학술대회논문집
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• pp.229-232
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• 2008

This study presents a numerical procedure to optimize the shape of stepped circular pin-fins to enhance turbulent heat transfer. The KRG method is used as an optimization technique with Reynolds-averaged Navier-Stokes analysis of fluid flow and heat transfer with shear stress transport turbulent model. The objective function is defined as a linear combination of heat transfer and friction loss related terms with a weighting factor. Ten training points are obtained by Latin Hypercube Sampling for two design variables. Optimum shape has been successfully obtained with the increased objective function.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 컴퓨터소사이어티 추계학술대회논문집
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• pp.11-14
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• 2003

In interconnection network for parallel processing, the cycle partitioning problem for parallel transmission with faulty vertieces or edges is very important. In this paper, we assume that k($\leq$m-1) edges do not share any vertices of m dimension hypercube Q$_{m}$ and show that it is possible to construct a cycle set which consists of k cycles covering all the vertices of the hypercube and one cycle including one of the given edges. This cycle set can be used to parallel transmission between two vertices joined by faulty edges.s.