• 한국농공학회논문집
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• 제52권5호
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• pp.19-26
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• 2010

This study was conducted to find out the reasonable optimum design method of agricultural reinforced concrete structures. Selected design variables are the dimension of concrete section, reinforced steel area, and objective function is formulated by cost function. To test the reliability, efficiency, possibility of application and reasonability of optimum design method, both continuous optimization method and mixed-discrete optimization method were applied to the design of reinforced concrete superstructure of aqueduct and application results were discussed. It is proved that mixed-discrete optimization method is more reliable, efficient and reasonable than continuous optimization method for the optimum design of reinforced concrete agricultural structures.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.341-348
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• 2001

A Mixed Volume and Boundary Integral Equation Method is applied for the effective analysis of plane elastostatic problems in unbounded solids containing general anisotropic inclusions and voids or isotropic inclusions. It should be noted that this newly developed numerical method does not require the Green's function for anisotropic inclusions to solve this class of problems since only Green's function for the unbounded isotropic matrix is involved in their formulation for the analysis. This new method can also be applied to general two-dimensional elastodynamic and elastostatic problems with arbitrary shapes and number of anisotropic inclusions and voids or isotropic inclusions. Through the analysis of plane elastostatic problems in unbounded isotropic matrix with orthotropic inclusions and voids or isotropic inclusions, it will be established that this new method is very accurate and effective for solving plane elastic problems in unbounded solids containing general anisotropic inclusions and voids or isotropic inclusions.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2009년도 학술대회
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• pp.542-546
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• 2009

모바일상의 혼합현실 기반의 소프트웨어 기술은 현재 국내외적으로 시작 단계에 있다. 하지만 급속한 모바일 인터넷 인프라의 확산, 모바일 기기의 성능 향상 및 개방형 모바일 OS의 등장으로 인해 모바일 혼합현실과 같은 새로운 융합형 IT기술이 사용자의 요구에 부흥하여, 수요가 급신장 되고 있다. 모바일 혼합현실 기반 기술 중 하나인 마커의 검출과 추적은 혼합현실의 가장 기본이며 매우 중요한 과정이다. 본 논문에서는 낮은 CPU를 이용하는 모바일 환경에 최적화된 실시간 마커 추적 방법에 대하여 제안한다. 낮은 CPU의 처리속도를 보완하기 위하여 처리영역을 축소하여 가변 탐색영역내의 공간에서 처리를 수행하고, 좌표변환정보를 이용하여 추적을 수행하는 캘리브레이션 과정을 대신하여 캠 시프트 알고리즘을 이용하여 효과적인 추적 방법을 제안한다.

• Structural Engineering and Mechanics
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• 제56권4호
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• pp.589-603
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• 2015

The mixed-mode stress intensity factors of 2-D angled cracks are evaluated by Petrov-Galerkin natural element (PG-NE) method in which Voronoi polygon-based Laplace interpolation functions and CS-FE basis functions are used for the trial and test functions respectively. The interaction integral is implemented in a frame of PG-NE method in which the weighting function defined over a crack-tip integral domain is interpolated by Laplace interpolation functions. Two Cartesian coordinate systems are employed and the displacement, strains and stresses which are solved in the grid-oriented coordinate system are transformed to the other coordinate system aligned to the angled crack. The present method is validated through the numerical experiments with the angled edge and center cracks, and the numerical accuracy is examined with respect to the grid density, crack length and angle. Also, the stress intensity factors obtained by the present method are compared with other numerical methods and the exact solution. It is observed from the numerical results that the present method successfully and accurately evaluates the mixed-mode stress intensity factors of 2-D angled cracks for various crack lengths and crack angles.

• Journal of applied mathematics & informatics
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• 제29권1_2호
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• pp.227-245
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• 2011

In this paper, we introduce a new iterative method for finding a common element of the set of solutions for mixed equilibrium problem, the set of solutions of the variational inequality for a ${\beta}$inverse-strongly monotone mapping and the set of fixed points of a family of finitely nonexpansive mappings in a real Hilbert space by using the viscosity and Ces$\`{a}$ro mean approximation method. We prove that the sequence converges strongly to a common element of the above three sets under some mind conditions. Our results improve and extend the corresponding results of Kumam and Katchang [A viscosity of extragradient approximation method for finding equilibrium problems, variational inequalities and fixed point problems for nonexpansive mapping, Nonlinear Analysis: Hybrid Systems, 3(2009), 475-86], Peng and Yao [Strong convergence theorems of iterative scheme based on the extragradient method for mixed equilibrium problems and fixed point problems, Mathematical and Computer Modelling, 49(2009), 1816-828], Shimizu and Takahashi [Strong convergence to common fixed points of families of nonexpansive mappings, Journal of Mathematical Analysis and Applications, 211(1) (1997), 71-83] and some authors.

• Journal of Power Electronics
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• 제16권1호
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• pp.27-37
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• 2016

In this paper, a mixed algorithm is proposed to overcome the limitations of the conventional algorithms, which cannot be applied in various driving patterns of drivers. The proposed algorithm based on the coulomb counting method is mixed with reset algorithms that consist of the enhanced OCV reset method and the DCIR iterative calculation method. It has many advantages, such as a simple model structure, low computational overload in various profiles, and a low accumulated SOC error through the frequent SOC reset. In addition, the enhanced parameter based on a mathematical analysis of the second-order RC ladder model is calculated and is then applied to all of the methods. The proposed algorithm is verified by experimental results based on a 27-Ah LiPB. It is observed that the SOC RMSE of the proposed algorithm decreases by about 9.16% compared to the coulomb counting method.

• 한국전산구조공학회논문집
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• 제23권6호
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• pp.693-702
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• 2010

In this paper, FETI(Finite Element Tearing and Interconnecting) method is introduced in order to improve numerical efficiency of Staggered method. The porous media theory, the Staggered method and the FETI method are briefly introduced in this paper. In addition, we account for the MPI(Message Passing Interface) library for parallel analysis, and the proposed combined Staggered method with FETI method. Finally Lagrange multipliers and CG(Conjugate Gradient) algorithm to solve decomposed domain are proposed, and then the proposed method is verified to be numerically efficient by MPI library.

• 한국지리정보학회지
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• 제24권3호
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• pp.10-31
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• 2021

본 연구를 통해 정의된 용도복합 개념은 세 가지 이상의 주요 도시기능의 복합을 의미하며 도시공간의 경제적, 사회적, 환경적 가치를 동시에 실현하기 위한 수단을 의미한다. 이러한 정의 하에서 서울의 용도복합 현상을 탐구하였다. 상대적 엔트로피 개념을 사용하여 단위 지역인 법정동을 기준으로 복합도(R.E.)를 측정하였으며 도시기능의 유형은 용도복합의 정의에서 도출한 개념을 통해 건축물 층별 용도를 유형화하여 계량화하였다. 서울의 용도복합 현상은 복합도(R.E.) 0.631 이하를 '복합아님', 복합도(R.E.) 0.631 초과 0.884 미만을 '불균형 복합', 복합도(R.E.) 0.884 이상 0.991 미만을 '균형복합', 복합도(R.E.) 0.991 이상을 '완전균형복합'의 단계로 구분하여 용도복합 현상을 해석하는 기준으로 지표화하였다.

• 한국농공학회논문집
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• 제46권2호
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• pp.77-89
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• 2004

This study was carried out to find out the reasonable optimum design method for the design of prestressed concrete structures. The optimum design problems were formulated and computer programs to solve these problems were developed. To test the reliablity, efficiency, possibility of application and reasonablity of optimum design problems and computer programs, both continuous optimization method and mixed-discrete optimization method were applied to the design of prestressed concrete composite girder and application results were discussed. It is proved that mixed-discrete optimization method is more reliable, efficient and reasonable than continuous optimization method for the optimum design of prestressed concrete structures.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제19권1호
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• pp.47-60
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• 2016

본 연구는 수학교육에서 혼합 연구방법(양적 연구방법과 질적 연구방법을 혼합한)을 활용한 연구에서 질적 연구 방법이 어떻게 적용되고 있는지를 분석하고, 질적 접근의 적용이 연구 목적 성취에 기여할 수 있는 시사점을 탐색하고 논의하고자 한다. 이러한 연구 목적을 달성하기 위하여, 본 연구에서는 한국수학교육학회의 초등수학교육 학회지에 2012년 게재된 전체 16편의 논문 중, 혼합 연구법을 활용한 논문 5편을 분석 대상으로 선정하였다. 비교 항목별 분석 결과를 양화된 수치로 간략하게 제시하던 기존의 혼합 연구물에 대한 분석 연구와는 달리, 본 연구는 질적 연구자의 관점에서, 자료 수집 및 자료 분석 방법, 연구 참여자 및 샘플링 선정 등을 중심으로 심도 있게 분석하여 그 결과와 시사점을 질적으로 제시하고 있다.