• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.908-911
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• 2002

This paper investigates the characteristics of deflection for circular plate that has same supporting condition along the width direction of plate according to the area change of supporting end. For two boundary conditions such as simple supporting and clamping on both ends, this study derives maximum deflection formula of circular plate using differential equation of elastic curve, assuming that a circular plate is a beam with different widths along the longitudinal direction. The deflection formula of circular plate is verified by carrying out finite element analysis with regard to the ratio of length of supporting part to radius of circular plate.

• Annual Conference on Human and Language Technology
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• 2000.10d
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• pp.285-291
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• 2000

필수적/수의적 논항의 이분법적 구분과 이에 따라 정문/비문을 논하는 것이 언어학과 자연어처리학에서 정설로 인정되어 왔다. 그러나 본 연구에서는 논항의 생략 현상과 왜 이러한 생략이 발생하는지에 대해 인지적인 관점에서 살펴봄으로써 기존의 이분적 개념들이 구문분석에 적합치 않음을 지적하였다. 그리고 이러한 문제점을 해결하기 위해 원형이론(prototype theory)을 도입하여 '필수적 논항도'와 '확률적 격구조'란 개념을 제안하였다. 이러한 개념들이 자연어처리의 구문분석에 효율적으로 적용될 수 있을 것으로 기대된다.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.1
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• pp.1-8
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• 1999

본 논문에서는 볼륨 렌더링에서 화상영역 수퍼샘플링을 효율적으로 수행시키는 방법을 제시한다. 이 알고리즘은 부화소에서 나오는 평행 광선들 간의 규칙성을 이용하여 각 화소로부터 상대 위치가 같은 부화소에서 나오는 광선마다 한 개씩의 원형을 만들어 둠으로써 수퍼샘플링을 효율적으로 수행한다. 또한 본 알고리즘은 객체순서 알고리즘에 기반을 두고 있으므로 화상순서 알고리즘에서도 수퍼샘플링을 하는 것보다 매우 빠르게 처리하게 된다. 또한 본 논문에서는 적응 수퍼샘플링 방법도 제안한다. 이는 에일리어싱이 생길 가능성이 많은 부분에서만 수퍼샘플링을 하며, 이러한 영역은 분류화 전처리 단게에서 미리 결정해둔다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.20 no.2
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• pp.63-75
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• 2017

In offshore environment, an accurate estimation of a wave-structure interaction has been an important issue for safe and cost effective design of fixed and floating offshore structures exposed to a harsh environment. In this study, a wave-structure interaction around a circular column was investigated with regular waves. To simulate 3D two-phase flow, open source computational fluid dynamics libraries, called OpenFOAM, were used. Wave generation and absorption in the wave tank were activated by the relaxation method, which implemented in a source term. To validate the numerical methods, generated Stokes 2nd-order wave profiles were compared with the analytic solution with deep water condition. From the validation test, grid longitudinal and vertical sizes for wave length and amplitude were selected. The simulated wave run-up and wave loads on the circular column were studied and compared with existing experimental data.

• Journal of the Korea Concrete Institute
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• v.14 no.5
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• pp.759-765
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• 2002

Prestressing tendons in the wall of circular storage tank are investigated from the viewpoint of equivalent load method. Special attention is paid to the effectiveness of eccentricities of the hoop and vertical tendons. Local effect at the bent Point of vertical tendon in the wall with varying thickness is examined. Some aspects which are frequently overlooked or misinterpreted in the conventional analyses of vertical tendons are discussed. Numerical examples are presented to emphasize the significance of accurate analysis of the vortical tendon in practice. It is expected that the equivalent load method can be effectively used to simplify the analysis of tendons in the circular wall and to minimize the errors.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.7
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• pp.414-420
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• 2004

Among the desirable properties of a piecewise linear parameterization, guaranteeing a one-to-one mapping (i.e., no triangle flips in the parameter plane) is often sought. A one-to-one mapping is accomplished by non-negative coefficients in the affine transformation. In the Floater's method, the coefficients were computed after the 3D mesh was flattened by geodesic polar-mapping. But using this geodesic polar map introduces unnecessary local distortion. In this paper, a simple variant of the original shape-preserving mapping technique by Floater is introduced. A new simple method for calculating barycentric coordinates by using straightest geodesics is proposed. With this method, the non-negative coefficients are computed directly on the mesh, reducing the shape distortion introduced by the previously-used polar mapping. The parameterization is then found by solving a sparse linear system, and it provides a simple and visually-smooth piecewise linear mapping, without foldovers.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.9
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• pp.884-890
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• 2008

A new guidance law to reach circular target area with grazing angle constraint is proposed as one of midcourse guidance laws of unmanned air vehicles. The purpose of the law is to control the grazing angle between the velocity vector of the vehicle and the line of sight to the aiming point, the center of the circular target area, when the vehicle passes any point on the circle. The optimal solution is derived based on the optimal control theory minimizing a range weighted control energy subject to the nonlinear dynamic equations of the vehicle approaching to the circular target area with grazing angle constraint. The major properties including a convergence of the solution are examined and the performance of the law applied to some typical scenarios is shown by the numerical simulation.

• The Journal of the Korea Contents Association
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• v.5 no.1
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• pp.109-116
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• 2005

This paper is to develop the prototype of a decision making for loan granting system at banks and to evaluate the effectiveness of it. The prototype is called at FENET-LG in this paper. The decision to grant a loan is an unstructured and vagueness task because it is required a tremendous amount of data and many complex relationships among them. Evaluating these many data and relationships is a difficult task even for most experienced decision maker of bank. Therefore, where complex judgement is required, the decision maker of bank may benefit from the use of fuzzy expert network to support the evaluation of ability to pay back. Given the characteristics of decision maker of banking facilities judgement task about ability to pay back, the prototype system named FENET-LG is constructed by integration of fuzzy expert system and neural network. The FENET-LG takes advantage of both the deductive approach of fuzzy expert system and the inductive approach of a neural network to provide a decision aid designed to support and facilitate the process of conducting a judgement of ability to pay back.

• Cartoon and Animation Studies
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• s.44
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• pp.263-284
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• 2016

The transformation of plots using the archetypical narratives is not just a repetition of the past story, but finding a new suitable meaning for present time and society. Due to this, the story can be variated depending on what the transformation has the main point for. Disney's animation overcomes the narrative feature of the past classic fairy tale that worked only for particular age and people, and recognized as a contemporary story that can give impression to more various people. This study use Vladimir Propp's Morphology of the Folktale, Carl Gustav Jung's complexes and shadow theory to examine how this animation is modernly recreated by transforming the archetypical narrative. As a result, we can find characteristics of structure and function for contemporary story, and those also work with characters in the recreated animation. Through this study we discovered that Disney's animation is a transfiguration of archetypical narrative through the exhaustive analysis, and this could be the helpful research for the future creation of animation which uses the archetypical narratives.

• Journal of the Korean Geotechnical Society
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• v.28 no.2
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• pp.23-31
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• 2012

The purpose of this study is to analyze earth pressure acting on a circular shaft-tunnel considering arching effect by centrifuge modeling test on sands. The centrifuge testing method provides a way to model an in-situ stress state condition with a stress gradient within a laboratory specimen. A small-scale model of circular shaft-tunnel, which has a real diameter of 6.0 m and height of 15.0 m, was designed and tested twice under 75g-level. Additionally, an effect of excavation was presented by separating two segments of circular shaft wall to find behavioral properties and strength of earth pressure along with excavating ground. The test results were compared with those of the proposed earth pressure equation. The test results showed that earth pressure decreased by about 70% in comparison with existing two-dimensional earth pressure. This fact might be attributed to three-dimensional arching effects.