• Journal of the Korean Society of Clothing and Textiles
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• v.32 no.12
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• pp.1825-1836
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• 2008

Many applications in computer graphics require complex and highly detailed models. However it is often desirable to use approximations in place of excessively detailed models in order to control the processing time. Thus, we aim to develop a notion of optimal matrix to simplify surface which can rapidly obtain the high quality 2D patterns flattening 3D surface as follows. Firstly, two 3D bodies are modeled based on existing Size Korea data. Secondly, each model is divided by shell and block for its pattern draft. Thirdly, each block is flattened by grid and bridge method. Finally, we selected the optimal matrix and demonstrated the efficiency and quality of the proposed method. This proposed approach accommodates surfaces with darts, which are commonly used in the clothing industry to reduce the deformation of surface forming and flattening. The resulting optimal matrix could be an initiation of standardization for pattern flattening. It is expected that this method could facilitate much better approximation in both efficiency and precision.

• Proceedings of the Korean Nuclear Society Conference
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• 1995.10a
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• pp.61-66
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• 1995

이 논문의 목적은 육방형 핵연료집합체로 구성된 3차원 노심을 해석하기 위한 다항식전개법을 개발하는 것이다. 이를 위해 3차원 육방형 핵연료 집합체를 6개의 3차원 프리즘노드로 분할하였다. 그리고 각 꼭지점에서의 점중성자속, 프리즘 각면의 면중성자속과 노드평균중성자속을 미지변수로 하여 다항식전개법에 의해 프리즘노드내의 중성자속분포를 근사하였다. 각 중성자속간의 관계식으로서 프리즘노드내에서의 노달중성자평형식, 두 노드사이의 면에서의 중성자류 연속관계식, 각 꼭지점에서의 중성자누설평형식을 사용하였다. 다항식전개법은 해석함수 전개법에 비해 약 3배정도 빠르며 4군확산방정식에도 훌륭이 적용되었다. 그리고 VVBR-1000 3차원 벤치마크 문제에서 최대출력오차 2.6%, VVER-440 3차원 벤치마크 문제에서 12 평면과 24평면으로 나눈 경우 각각 최대출력오차 15%와 6.6%, SNR 3차원 문제에서 8 평면과 16 평면으로 나눈 경우 각각 최대오차 5.4%와 2,6%를 보였다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.10 no.1
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• pp.9-15
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• 2017

In this study we performed the experiment to detect the ERP using SVM with wavelet features. The EEG signal that is generated visual stimulated ERP database in SCCN applied for the experiment. The feature vectors for experiment are categorized frequency and continuous wavelet- based vectors. In experimental results, the detection rate of SVM with wavelet feature vectors improved above 10% comparing with frequency- based feature vector. Based on the experimental results we analyzed the relation between the activity degree of the ERP and the band split characteristics of the ERP by wavelet transform.

• Journal of the Korean Magnetics Society
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• v.18 no.1
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• pp.36-38
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• 2008

We calculate the electron scattering amplitude with reduced angular momentum expansion(RAME) and compare it with the plane wave approximation. By using WKB approximation it is shown that the curvature correction factor given by RAME is originated from the source wave centrifugal potential energy. The factor also can be understood as an effective wave number correction factor in plane wave approximation. Angular momentum and its relationship with scattering amplitude is explicitly shown.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.2
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• pp.117-126
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• 2009

In order to test the accuracy between the modified mild slope equation (MMSE) without evanescent modes and the plane-wave approximation (PA) of eigenfunction expansion method, various numerical results from both models are presented. In this study, analytical solutions of two models are employed, one based on the MMSE derived by Porter (2003) and the other on the scatterer method of PA by Seo (2008a). Judging from direct comparisons against existing results of rapidly varying topography, the PA model gives better predictions of the wave propagation than the MMSE model.

• Electrical & Electronic Materials
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• v.23 no.2
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• pp.5-13
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• 2010

• The Mathematical Education
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• v.32 no.3
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• pp.136-142
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• 1993

• Journal of the Korean Society of Clothing and Textiles
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• v.30 no.8
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• pp.1242-1252
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• 2006

Many applications in computer graphics require complex, highly detailed models. However, to control processing time, it is often desirable to use approximations in place of excessively detailed models. Therefore, we have developed the notion of an optimal matrix to simplify the model surface which can then rapidly obtain high quality 2D patterns by flattening the 3D surface. Firstly, the woman's 3D body was modeled based on Size Korea data. Secondly, the 3D model was divided by shell and block for the pattern draft. Thirdly, each block was flattened by the grid and bridge method. Finally, we select the optimal matrix and demonstrate it's efficiency and quality. The proposed approach accommodates surfaces with darts, which are commonly utilized in the clothing industry to reduce the deformation of surface forming and flattening. The resulting optimal matrix could be an initiation of standardization for pattern flattening. This can facilitate much better approximations, in both efficiency and exactness.

• Journal of Korea Ship Safrty Technology Authority
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• v.5
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• pp.10-19
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• 2000

소형어선이나 일반적인 활주형선형은 부분적인 형상 수정을 거치게 되면 3차원 곡면으로 이루어진 선체의 외판을 2차원 평면상에 전개하여 표현할 수 있다는 특성을 가지고 있다. 이러한 점을 활용하여 전개도형에 따라서 제작된 얇은 FRP 판재를 선 요소들로 정의된 형틀 상에서 변형시켜 선체의 형상을 만들고 그 내부에 추가로 FRP를 적층 함으로서 선체를 완성하는 방법을 제안하고자 한다.

• Korean Institute of Interior Design Journal
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• v.16 no.3 s.62
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• pp.46-57
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• 2007

본 연구는 현대 집합주택의 개발의 실험적 토대가 되었던 1960년대 이후 1990년대 초반까지의 서울지역 아파트단지들을 중심으로 단지의 측면과 단위평면의 측면에서 시대적 변천과 유형별 특성을 분석하여 국내 집합주거의 양상이 어떻게 전개되어 왔는지를 인식하고, 국내 집합주거의 질적 향상을 위한 대안을 제시하고자 하는 추후 연구의 한 준거를 제시토록 한다. 이를 위하여 집합주거의 생성과 현황에 대하여 일반적인 고찰을 진행하여, 국내 주거양식이 점차로 고층, 고밀화되어가는 과정을 살펴보고, 이러한 주거양식의 집합화가 점차로 정책적인 차원에서 더욱 고려되어지고 있음을 현대에 이르기까지의 시대적 틀 속에서 고찰해 본다. 이와 함께 집합화되는 주거양식이 단위평면속에서는 어떻게 변천해 왔는지를 규모와 제실구성, 설비 및 구조방식, 내부공간 구성방식등으로 나누어 분석한다.