• 사회복지연구
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• 제42권2호
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• pp.205-233
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• 2011

이 연구는 복지국가의 제도적 맥락에 기초하여 '사회의 질(social quality)' 하위영역 중 사회경제적 안전성의 영역과 사회적 응집성의 영역의 관계를 파악하고자 하는 목적에서 출발한다. 복지국가의 제도적 맥락을 포착하기 위한 틀로 복지지위론을 채택하여 각 개인이 가지는 사회경제적 자원을 복지수급자의 지위와 복지납세자의 지위로 측정하였으며, 사회경제적 안전성의 영역이 사회적 응집성의 영역에 영향을 미친다는 이론적 가설을 설정하였다. 가설 검증을 위해 사회적 응집성의 핵심지표로 사회신뢰 인식을 투입하여, 2008년에 실시된 사회조사자료를 대상으로 복지지위, 사회경제적 안전성 인식, 사회신뢰 인식에 이르는 구조방정식모형(SEM) 분석을 실시하였다. 분석 결과, 복지수급의 권리 차원에서의 자원의 양은 사회경제적 안전성에 유의미한 영향을 미쳤으나, 복지공급의 의무 차원에서의 자원의 양은 유의한 영향을 미치지 못하였다. 복지수급의 권리 차원과 의무 차원 모두 사회신뢰 인식에는 유의한 영향을 미쳤으며, 사회경제적 안전성에 대한 인식은 사회신뢰에 대한 인식에 유의한 영향을 미쳤다. 결론적으로, 사회의 질 하위영역 들 중에서 사회경제적 안전성 분면이 사회적 응집성 분면에 영향을 미치는 것을 확인하였다. 이런 결과들은 향후 한국사회의 사회적 응집 수준을 높이기 위해서는 보다 정교한 수준의 복지제도 배치가 필요함을 암시한다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.55-58
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• 2002

Parallel finite element code has been recently developed for the analysis of the incompressible Wavier-Stokes equations using domain decomposition method. Metis and MPI libraries are used for the domain partitioning of an unstructured mesh and the data communication between sub-domains, respectively. For unsteady computation of the incompressible Navier-Stokes equations, 4-step splitting method is combined with P1P1 finite element formulation. Smagorinsky and dynamic model are implemented for the simulation of turbulent flows. For the validation performance-estimation of the developed parallel code, three-dimensional Laplace equation has been solved. It has been found that the speed-up of 40 has been obtained from the present parallel code fir the bench mark problem. Lastly, the turbulent flows around the MIRA model and Tiburon model have been solved using 32 processors on IBM SMP cluster and unstructured mesh. The computed drag coefficient agrees better with the existing experiment as the mesh resolution of the region increases, where the variation of pressure is severe.

• 전기학회논문지
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• 제62권10호
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• pp.1425-1435
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• 2013

The useful method for determining parameters of weighting functions used to design the $H_{\infty}$ current controller for attenuating the current ripple due to saliencies which SPMSM(Surface Permanent Magnet Synchronous Motor) also incorporates is described. To analyze the effect, the current ripple due to the structural and the saturation saliencies, the SPMSM model with nonlinear inductance function depending on the two independent variables, rotor position and stator current is simulated. After analysis, parameters of the weighting functions for $H_{\infty}$ current controller is selected to satisfy the robust stability, robust performance and specific performance in time and frequency domain by using the PSO(Particle Swarm Optimization) algorithm in the linear SPMSM model. Especially, the robust performance is proved that the selected weighting functions play a role in reducing the current ripple caused by the saliencies of SPMSM at the desired frequency range by the simple experiment.

• 대한수학회보
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• 제39권1호
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• pp.9-22
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• 2002

We consider the hp-version to solve non-constant coefficient elliptic equations with Dirichlet boundary conditions on a bounded, convex polygonal domain $\Omega$ in $R^{2}.$ To compute the integrals in the variational formulation of the discrete problem we need the numerical quadrature rule scheme. In this paler we consider a family $G_{p}= {I_{m}}$ of numerical quadrature rules satisfying certain properties. When the numerical quadrature rules $I_{m}{\in}G_{p}$ are used for calculating the integrals in the stiffness matrix of the variational form we will give its variational fore and derive an error estimate of ${\parallel}u-\tilde{u}^h_p{\parallel}_0,{\Omega}'$.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(4)
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• pp.203-206
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• 2000

Since the amplitude of voiced fall off at about -20dB/decade, dynamic range is often compressed prior to spectral analysis so that details at weak, high frequencies may be visible. Preemphasizing the speech, either by differentiating the analog speech s$\sub$a(t) prior to A/D conversion or by differencing the discrete-time s(n)=s$\sub$a(nT), compensating for falloff at high frequencies. The most common form of preemphasis is y(n)=s(n)-As(n-1), where A typically lies between 0.9 and 1.0 and reflects the degree of pre-emphasis. In This paper, we proposed that A is adjusted at each time by measuring the slope of envelope in frequency domain.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.391-394
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• 2002

This paper introduces that the lathe optimize for main and sub spindle's synchronous in Opening-CNC. In view of optimal design, the mathematical modelling and the frequency domain analysis of spindle's system are performed. For the compensation of synchronous error in compounded manufacture process, the optimization method of motor drive's control parameter and the related parameter is proposed. By the experiment in prototype machines using the server/client program, the validity of the proposed method is verified.

• Nuclear Engineering and Technology
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• 제33권5호
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• pp.539-546
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• 2001

Systematic procedure of developing radionuclide release scenarios was established based on FEP list and Interaction Matrix for near-surface LILW repository. FEPs were screened by experts＇review in terms of domestic situation and combined into scenarios on the basis of Interaction Matrix analysis. Under the assumption of design scenario, The system domain was divided into three sections: Near-field, Far-field and Biosphere. Sub-scenarios for each section were developed, and then scenarios for entire system were built up with sub-scenarios of each section. Finally, sixteen design scenarios for near-surface repository were evaluated A reference scenario and other noteworthy scenarios were selected through experts＇scenario screening.

• 한국정밀공학회지
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• 제20권3호
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• pp.74-81
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• 2003

This paper introduces that the turning center optimizes main and sub spindle's synchronized controller in Open-CNC. In view of optimal design, the mathematical modeling and the frequency domain analysis of spindle's system are simulated. For the minimizing of synchronized error in each spindle's speed, the study of control method and the related control parameter is proposed. By the experiment in prototype machines using the server/client program, the validity of the proposed synchronous error's compensation method is verified.

• Journal of Information Processing Systems
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• 제15권2호
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• pp.320-330
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• 2019

This study analyzed changes in sociality and democratic-citizenship among elementary school students in the information class and the science class at the Science Education Institute for the Gifted, who were divided into an experimental group and a control group. The experimental group engaged in the Learning Together (LT) cooperative form of learning for which the remix function of Scratch, an educational programming language, was applied, while the control group was given general instructor-led lessons. Members in the experimental group were able to modify processes during projects through the usage of the remix function, thereby actively participating in the projects and eventually generating team-based results. The post-class t-tests showed a greater degree of improvements in sociality and democratic citizenship for the experimental group that was offered the remix-function-based cooperative learning than the control group. Statistically significant differences were present between two groups particularly in "cooperative spirit" sub-domain of sociality and the "community" and "responsibility" sub-domains of democratic citizenship.

• 한국항공우주학회지
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• 제31권1호
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• pp.1-7
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• 2003

익형에 대한 공력 최적설계 프로그램을 개발하였으며, 점성 유동장에 대한 보다 정확한 정보를 설계에 반영하기 위하여 나비어-스톡스 방정식을 사용하였다. 최적설계 방법으로는 민감도 해석을 위하여 수정유용방향탐색방법(Modified Method of Feasible Directions, MMFD)을 사용하였으며 이동거리 계산을 위하여 다항식 보간법을 사용하였다. 또한 설계시간을 단축하기 위하여 MPI를 사용하여 병렬화하였다. 전체 유동장을 8개의 영역으로 분할하였으며 분할된 영역은 지정된 프로세서에 할당하여 계산을 수행하였다. 민감도 계산을 위하여 각 프로세서에 할당하여 계산을 수행하였다. 민감도 계산을 위하여 각 프로세서에 각 탐색방향을 할당하여 민감도를 병렬계산하였다. 본 연구의 수행 결과 양력은 허용한도 내의 일정한 값을 유지하는 가운데 항력이 감소된 최적화된 익형의 형상을 설계할 수 있었다.