• 전산구조공학
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• 제9권4호
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• pp.155-163
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• 1996

전통적인 유한요소법을 이용하여 얇은 탄성 구조물을 해석하는 경우, 전단 및 막 록킹에 의하여 해석결과의 품질이 저하될 수 있다. 더욱이 수치결과의 록킹방생 여부를 다른 참고할 만한 자료와 비교하지 않고 감지한다는 것은 그다지 쉽지 않다. 본 논문은 록킹에 대한 이론적 해석과 더불어 후 록킹인식을 위한 신뢰성이 있는 한가지 간단한 방법을 소개하고자 한다. 또한 이론적인 결과를 입증하기 위한 수치결과도 주어져 있다.

• 전자공학회논문지B
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• 제32B권8호
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• pp.1127-1136
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• 1995

In this paper, a morphological shape decomposition method is proposed for the purpose of pattern recognition and image compression. In the method, a structuring element that geometrical characteristics is more similar to the shape function is preselected. The shape is decomposed into the primitive elements corresponding to the structuring element. A gray scale image also is transformed into 8 bit plane images for the hierarchical reconstruction required in image communication systems. The shape in each bitplane is decomposed to the proposed method. Through the experiment. it is proved that the description error is reduced and the coding efficiency is improved.

• 건축역사연구
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• 제8권3호
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• pp.39-51
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• 1999

The purpose of this study is to establish the theory of the spatial composition that is 'The Structure of Relation' in Korean traditional houses. This study has been focused on the spatial composition of Hyangdan. The form composition is an element defining primitive functions and space and producing aesthetical effects, where 'quality as a substance' is not important but 'quality as a relation' is essential. Quality as a meaningful relationship comes from realization and regulation of visual attributes among form elements. Each form compositional element establishes the hierarchical structure logically with the entire order, In order for the quality of all form compositional elements to be clarified as a meaningful relationship logically, 'compositional concept' which combines a series of form elements into the grammatical dependence to a specific direction, has to be assumed. If the intrinsic relationship among a series of form compositional elements fails to confront with the 'contextual concept' which eventually indicates unique conditions for a place according to the refined compositional concept, the result of form composition never leads to a specific solution

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2004년도 추계학술대회
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• pp.221-229
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• 2004

Recently, there has been enormous growth in the amount of commercial and scientific data, such as protein sequences, retail transactions, and web-logs. Such datasets consist of sequence data that have an inherent sequential nature. However, only a few of the existing clustering algorithms consider sequentiality. This study presents a method for clustering such sequence datasets. The similarity between sequences must be decided before clustering the sequences. This study proposes a new similarity measure to compute the similarity between two sequences using a sequence element. Two clustering algorithms using the proposed similarity measure are proposed: a hierarchical clustering algorithm and a scalable clustering algorithm that uses sampling and a k-nearest neighbor method. Using a splice dataset and synthetic datasets, we show that the quality of clusters generated by our proposed clustering algorithms is better than that of clusters produced by traditional clustering algorithms.

• Advances in materials Research
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• 제12권2호
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• pp.133-159
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• 2023

In this paper, a size-dependent dynamic investigation of a porous metal foams microbeamsis presented. The novelty of this study is to use a metal foam microbeam that contain porosities based on the refined high order shear deformation beam model, with sinusoidal shear strain function, and the modified strain gradient theory (MSGT) for the first time. The Lagrange's principle combined with differential quadrature hierarchicalfinite element method (DQHFEM) are used to obtain the porous microbeam governing equations. The solutions are presented for the natural frequencies of the porous and homogeneoustype microbeam. The obtained results are validated with the analytical methods found in the literature, in order to confirm the accuracy of the presented resolution method. The influences of the shape of porosity distribution, slenderness ratio, microbeam thickness, and porosity coefficient on the free vibration of the porous microbeams are explored in detail. The results of this paper can be used in various design formetallic foammicro-structuresin engineering.

• Journal of Information Processing Systems
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• 제19권2호
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• pp.203-210
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• 2023

The addition of traditional elements can enhance the uniqueness of visual communication design. This paper briefly introduced visual communication and applications of traditional elements in visual communication design and applied paper cuts, a handmade graphic element, to the logo design of Dezhou University's 50th anniversary. The convolutional neural network (CNN) algorithm and the analytic hierarchy process method were applied to evaluation analysis and compared with the support vector machine (SVM) algorithm. The results of the CNN algorithm on the test set verified its effectiveness. The evaluation results of the CNN algorithm were similar to the manual evaluation results, further proving the effectiveness and high efficiency of the CNN algorithm. The hierarchical analysis and the analysis of the assessment results of the CNN algorithm found that the two logo designs made full use of paper cuts.

• 한국도서관정보학회지
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• 제44권1호
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• pp.201-225
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• 2013

메타데이터 요소들 사이의 매핑에 기반한 현재의 메타데이터 상호운용성 접근방식이 지닌 한계를 극복하기 위해, 본 연구에서는 마스터 데이터를 활용한 메타데이터 상호운용성 접근방식을 제안하고 있다. 이는 메타데이터 요소가 아닌 요소의 값을 기준으로 동일한 값을 지니는 요소를 마스터 요소를 중심으로 통합하는 방식이다. 이를 위해 마스터 요소 프레임워크를 구축하여 메타데이터 요소들을 계층적인 형태로 의미적으로 통합하고, 이를 기반으로 메타데이터 레코드 사이의 상호연결을 확보함으로써 메타데이터 상호운용성을 확보할 수 있다. 이는 메타데이터 상호운용성을 확보하기 위한 대안적인 방법으로 활용될 수 있다.

• 콘크리트학회논문집
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• 제17권6호
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• pp.1053-1064
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• 2005

The mechanical damage of concrete is normally attributed to the formation of microcracks and their propagation and coalescence into macroscopic cracks. This physical degradation is caused from progressive and hierarchical damage of the microstructure due to debonding and slip along bimaterial interfaces at the mesoscale. Their growth and coalescence leads to initiation of hairline discrete cracks at the mesoscale. Eventually, single or multiple major discrete cracks develop at the macroscale. In this paper, from this conceptual model of mechanical damage in concrete, the computational efforts were made in order to characterize physical cracks and how to quantify the damage of concrete materials within the laws of thermodynamics with the aid of interface element in traditional finite element methodology. One dimensional effective traction/jump constitutive interface law is introduced in order to accommodate the normal opening and tangential slips on the interfaces between different materials(adhesion) or similar materials(cohesion) in two and three dimensional problems. Mode I failure and mixed mode failure of various geometries and boundary conditions are discussed in the sense of crack propagation and their spent of fracture energy under monotonic displacement control.

• Steel and Composite Structures
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• 제48권4호
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• pp.429-441
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• 2023

This research presents an advanced finite element formulation for analyzing the vibratory behaviour of tapered composite shaft rotors, taking into account the impact of the draft angle on the stiffness of the composite shaft laminate. The vibration response of the shaft rotating around its axis is studied using both the finite element hierarchical method and the classical finite element formulation, based on the theory of transverse shear deformation, rotary inertia, gyroscopic effect, and coupling effect due to the stratification of the composite layers of the shaft. The study also includes the development of a program to calculate the Eigen frequencies and critical speeds of the system, and the obtained results are compared with those available in the literature. This research provides valuable insights into the vibratory behaviour of tapered composite shaft rotors and can be useful for designing and optimizing such structures in various industrial applications.

• 한국전산구조공학회논문집
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• 제20권5호
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• pp.533-541
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• 2007

계층적 p-세분화를 위해 Zienkiewicz-Zhu 오차평가법이 약간 수정되었으며, 이 방법의 유효성을 보이기 위해 휨을 받는 개구부를 갖는 Reinssner-Mindlin $C^{\circ}$-평판에 적용하였다. 유한요소해석상의 적응적 체눈을 결정하는 단계는 초수렴 팻취 복구기법에 기초를 둔 사후오차평가자와 연계된 p-세분화에 의해 제안되었다. 요소내의 변위장을 정의하기 위해 적분형 르장드르 고차 형상함수가 사용되는 반면 복구응력을 보간하기 위해 파스칼의 삼각수에 기초를 둔 같은 차수의 고차다항식이 사용되는 이유로 수정 Z/Z 오차평가는 종래의 방법과 다소 차이를 보여준다. 가우스 적분점에서의 응력을 최적화하기 위해 필요한 다항식으로 표현되는 응력함수를 얻기 위해 최소제곱법이 사용되었다. 고정된 요소망에 거의 최적의 형상함수 차수의 분배를 찾기 위한 전략이 논의되었는데, 허용되는 정확도를 얻을 수 있을 때까지 각 요소마다 형상함수의 차수를 불균등하게 증가시키는 방법으로, 소위 최적의 선택적 p-분배를 자동으로 결정하도록 되어있다. 위의 사항들을 L-형 평판 해석에 적용한 결과, 적응적 p-체눈설계 단계가 진행됨에 따라 자유도의 증가에 따라 오차량은 급격히 감소되는 것을 알 수 있었고, 제안된 오차 지시자에 의한 적응적 p-체눈 세분화는 최적 p-분배 진행방향에 근접하는 것을 볼 수 있었다.