• Journal of the Computational Structural Engineering Institute of Korea
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• v.17 no.1
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• pp.1-10
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• 2004

Adaptive finite element analysis, in which its solution error meets with the user defined allowable error, is recently used to improve the reliability of finite element analysis results. This adaptive analysis is composed of two procedures; one is the error estimation of an analysis result and the other is the reconstruction of finite elements. In the (p-method, an element size is controlled by relocating of nodal positions (r-method) and the order of an element shape function is determined by the hierarchical polynomial (p-method) corresponding to the clement solution error by the enhanced SPR. In order to show the effectiveness and the accuracy of the suggested rp-method, various numerical examples were analyzed and these analysis results were examined by comparing with those obtained by the existed methods.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.14 no.4
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• pp.525-535
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• 2001

In this paper, a new adaptive analysis scheme for element-free Galerkin method(EFGM) is proposed. The novel point of this scheme is that the triangular cell structure based on the Delaunay triangulation is used in the numerical integration and the node adding/removing process. In adaptive analysis with this scheme, there is no need to divide the integration cell and the memory cell structure. For the adaptive analysis of crack propagation, the reconstruction of cell structure by adding and removing the nodes on integration cells based the estimated error should be carried out at every iteration step by the Delaunay triangulation technique. This feature provides more convenient user interface that is closer to the real mesh-free nature of EFGM. The analysis error is obtained basically by calculating the difference between the values of the projected stresses and the original EFG stresses. To evaluate the performance of proposed adaptive procedure, the crack propagation behavior is investigated for several examples.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2003.06a
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• pp.247-250
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• 2003

디지털 2차 적응 IIR 대역 통과 필터의 진폭 특성을 해석, 적응 계수와 입력 신호의 중심 주파수 그리고 극의 각과의 관계를 해석하고, 적응 계수의 경계를, 기존에 발표된 세 알고리즘을 예로 들어, 평가하였다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.13 no.4
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• pp.485-500
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• 2000

In this paper the adaptive crack propagation analysis based on the estimated local and global error in the element-free Galerkin (EFG) method is presented. It is possible to keep consistency and accuracy of analysis in each propagation step by adaptive analysis. The adaptivity analysis in crack propagation is achieved by adding and removing the node along the background integration cell that are refined or recovered as estimated error. These errors are obtained by calculating the difference between the values of the projected stresses and original EFG stresses. To evaluate the performance of proposed adaptive procedure, the convergence behavior is investigated lot several examples. The results of these examples show the efficiency of proposed scheme in crack propagation analysis.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.37 no.4
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• pp.205-213
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• 1988

It has been very difficult to solve the semiconductor problems by numerical analysis techique due to the strong nonlinearity of the governing equations. Thus, we proposed a double structured adaptive refinement scheme to the finite element analysis of semiconductor devices, which guarantees a succesive convergency and gives better quality to the solutions.i.e., in the first step, the main factor of divergence in the current continuity equation is eliminated and the next, the solution quality is improved by reducing the discontinuity of current. The result of test application to the GaAs MESFET model shows that the proposed method is much dffective and efficient in the numerical analysis of semiconductor.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.606-611
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• 2007

최근 u-healthcare 서비스 분야에서 단일 시점의 일반화된 치료가 아닌 장시간 개개인의 특성이 반영된 진료와 의료 서비스에 대한 관심이 증가하고 있다. 그러나 기존의 생체 신호 해석은 임상적인 실험을 통해 얻은 표준화된 임계치를 이용해 분석하는 일관된 판단 방법이 주를 이루었다. 본 논문에서는 미래형 홈 환경에서 사용자에 따라 다른 신호 해석을 지원하는 사용자 적응적 생체 신호 해석 방법을 제안한다. 생체 신호 해석은 사용자의 컨텍스트와 환경 컨텍스트를 통합하는 모듈과, 지식표현 기법을 적용한 개인화된 추론 모듈로 구성된다. 제안된 방법은 사용자 정황 정보를 고려하여 사용자 적응적인 생체 신호 해석을 지원하며, 환경 컨텍스트를 고려하여 환경의 변화에 영향을 최소화하는 생체 신호 해석을 지원한다. 또한 사상의학 이론을 생체신호 해석에 동적으로 적용할 수 있는 틀을 제공한다. 이는 추후 미래형 홈 환경에서 다양한 종류의 센서와 함께 개인화된 맞춤형 재택 건강관리 서비스에 활용할 수 있다.

• Journal of Korea Multimedia Society
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• v.12 no.9
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• pp.1210-1216
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• 2009

In this paper we analyze the convergence behavior of the recursive least rank (RLR) L-filter. The RLR L-filter is an order statistics filter, filter coefficients of which are the weights according to the order of magnitude of inputs. And RLR L-filter is a non-linear adaptive filter, that uses RLR algorithm for coefficient updating. The RLR algorithm is a non-linear adaptive algorithm based on rank estimates in Robust statistics. The mean and mean-squared convergence behavior of the RLR L-filter is examined with variable step-sizes. The RLR L-filter adapts the median filter type to the heavy-tailed distribution function of impulse noise, and adapts the average filter type to Gaussian noises.

• Journal of Korean Home Economics Education Association
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• v.21 no.2
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• pp.159-169
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• 2009

After analyzing data of 797 Middle and High School students, the results show that those using cognitive reappraisal strategies adjusted better in school life than those using expressive suppression strategies in regards to application of emotional regulation strategies. In gender differences of the application, male students adjusted better when they used cognitive reappraisal strategies in relationship with their teachers and their peers. Female students, on the other hand, adjusted better in relationship with their teachers their peers, and in academics, when using cognitive reappraisal strategies. In school year differences, middle school students who used less of emotional regulation strategies in academics, friendship and student-teacher relations adjusted better in relationship with their peers.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.15 no.1
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• pp.85-94
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• 2002

In this study an adaptive node generation procedure in the Element-free Galerkin (EFG) method using bubble-meshing technique is Proposed. Since we construct the initial configuration of nodes by subdivision of background cell, abrupt changes of inter-nodal distance between higher and lower error regions are unavoidable. This unpreferable nodal spacing induces additional errors. To obtain the smooth nodal configuration the nodal configurations are regenerated by bubble-meshing technique. This bubble meshing technique was originally developed to generate a set of well-shaped triangles and tetrahedra. In odder to evaluate the effect of abrupt changes of nodal spacing, one-dimensional problems with various nodal configurations mere investigated. To demonstrate the performance of proposed scheme, the sequences of making optimal nodal configuration with bubble meshing technique are investigated for several problems.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.04a
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• pp.506-509
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• 2004

생물과 같이 외부 환경의 변화에 적응하는 능력을 갖도록 하기 위한 시스템을 다치오토마타를 사용하여 모델화하고 이들에 대하여 도태, 교배, 돌연변이 둥의 유전적 조작을 반복함 적용에 의해 유한 상태 전이 과정을 해석하고 응용할 수 있는 방법을 제안한다. 이러한 해석과 방법에 대한 모델을 기초로 자기 갱신할 수 있는 자율 오토마타와 환경에 적응할 수 있는 적응 오토마타를 실현하는 기초 단계로 적용할 수 있는 가능성을 제안한다.