• 한국통신학회논문지
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• 제21권11호
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• pp.2862-2868
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• 1996

본 논문에서는 두계층(이진)의 간단한 적응적(adaptive) 율 제어를 원거리 목적지와 근거리 목적지를 모두 포함하고 있는 멀티캐스트(점-대-다중점) 연결에 적용하는 경우 원거리 및 근거리 경로에서의 성능을 개별적으로 동시에 평가할 수 있는 큐잉 모델을 제시하고 이를 분석하였다. 가정한 율 제어 기법은 점-대-점 연결을 위한 이진 율 제어 기법을 단순하게 멀티캐스트 연결에 적용한 것이다. 원거리 및 근거리 목적지에서의 개별적인 셀 손실율을 효율적으로 계산할 수 있는 방법을 개발하였고 이 방법을 사용하여 수치적 결과를 얻어 본 결과, 같은 거리의 경로만으로 이루어지는 멀티캐스트 연결에 적용할 경우 공정한 율 제어 방법이, 경로 별 거리차가 있는 멀티 캐스트 연결에 대해서는 원거리 경로가 근거리 경로에 비하여 불리한 대우를 받는 불공정성을 드러냄을 볼 수 있었다.

• 한국환경복원기술학회지
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• 제24권6호
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• pp.97-107
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• 2021

Abnormal climate caused by climate change causes enormous social and economic damage. And such damage and its impact may vary depending on the location and regional characteristics of the region and the social and economic conditions of local residents. Therefore, it is necessary to continuously monitor whether there are indicators that are weaker than other regions among the detailed indicators that constitute the risk, exposure and vulnerability of climate change risk. In this study, the concept of climate change risk was used for heatwave to determine regional inequality of climate change risk. In other words, it was judged that inequality in climate change risk occurred in regions with high risk but high exposure and low vulnerability compared to other regions. As a result of the analysis, it was found that 13 local governments in Korea experienced regional inequality in climate change risk. In order to resolve regional inequality in climate change risks, the current status of regional inequality in climate change should be checked based on the analysis proposed in this study, there is a need for an evaluation and monitoring system that can provide appropriate feedback on areas where inequality has occurred. This continuous evaluation and monitoring-based feedback system is expected to be of great help in resolving regional inequality in climate change risks.

• 한국콘텐츠학회논문지
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• 제13권2호
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• pp.235-243
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• 2013

이 연구는 지방분권을 위한 정책수단으로 재정분권이 어떠한 방식으로 이해될 수 있으며, 왜 필요한지에 대해 시스템사고의 이론을 바탕으로 지방재정시스템을 구성하는 변수들의 상호작용관계를 분석하였다. 연구를 통해 얻어진 결과는 다음과 같다. 첫째, 지방재정시스템을 구성하는 변수들은 상당한 수준에서상호작용관계가 형성되고 있으며, 5개의 양(+)의 피드백 루프가 중심이 되어 급속한 성장과 급속한 쇠퇴를 거듭한다는 점을 발견할 수 있었다. 둘째, 지방재정분권화의 타당성에 대한 전략 지점이 인과지도 모델링을 통해 발견되었다. 특히, 선순환구조를 악순환의 구조를 변질시키는 변수(국고보조금, 부동산거래과세, 중앙정부차원의 지방재정조정제도, 지방정부채무 등)이 지속적으로 작동함으로써 지방재정시스템을 쇠퇴시키는 것으로 나타났으며, 이를 바탕으로 전략적 정책과제가 도출 될 수 있었다. 이러한 연구는 지방재정분권에 대해 부분에 지식이 아닌 전체적 지식의 관점에서 지방재정시스템을 이해하고 지방재정의 학문적 폭을 높여 줄 것으로 판단된다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.780-785
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• 2007

Accurate and fast haptic simulations of deformable objects are desired in many applications such as medical virtual reality. In haptic interactions with a coarse model, the number of nodes near the haptic interaction region is too few to generate detailed deformation. Thus, local refinement techniques need to be developed. Many approaches have employed purely geometric subdivision schemes, but they are not proper in describing the deformation behavior of deformable objects. This paper presents a continuum mechanics-based finite element adaptive method to perform haptic interaction with a deformable object. This method superimposes a local fine mesh upon a global coarse model, which consists of the entire deformable object. The local mesh and the global mesh are coupled by the s-version finite element method (s-FEM), which is generally used to enhance accurate solutions near the target points even more. The s-FEM can demonstrate a reliable deformation to users in real-time.

• International Journal of Contents
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• 제10권3호
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• pp.55-63
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• 2014

Existing science education that excludes narrative thinking impedes the understanding of the context of workbook content. The object of this research is to develop a storytelling-learning program based on narrative thinking to elevate learners' interest in science and expand their inventive problem-solving abilities. Following an analysis of the current Korean curriculum, eight types of storytelling materials that utilize local content were developed for grades 7-9. The learning program used quest storytelling and was designed such that learning activities such as investigation, discussion, and experimentation were included in the process of solving each quest. Learners experienced an interest in storytelling learning resulting from participation in this storytelling-learning program. Moreover, learners demonstrated inventive problem-solving abilities in the process of completing the stories. During the process of assembling the storytelling materials, the students interacted with enthusiasm and generated ideas. The teachers indicated a positive feedback to the storytelling program as a new attempt to stimulate learners' interests. In the future, with continuous development and application, storytelling-science-learning programs that base science learning on narrative thinking are expected to be successful.

• 한국철도학회논문집
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• 제2권3호
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• pp.46-53
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• 1999

In this paper, made was a study on a mesh generation method based on the pollution error. This method is designed for the control of the pollution error in any patch of elements of interest. It is a well-known fact that the pollution error estimates are much more than the local one. When the pollution error is significant, nothing can be said about the reliability of any estimator based on local computations in the patch. Reliable a posteriori error estimation is possible by controlling the pollution error in the patch through proper design of the mesh outside the patch. This design is possible by equally distributing the pollution error indicators over the mesh outside the patch. The mesh generated from the conventional feedback pollution-adaptive mesh generation algorithm needs many iterations. Therefore, the solution time is significant. But the remeshing scheme in the proposed method was used here. It was shown that the pollution-adaptive mesh improves the E.I., simply denoted as Effectivity Index, on the patch of interest, and the pollution error reduces less than the local error.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.373-380
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• 2006

Accurate and fast haptic simulations of deformable objects are desired in many applications such as medical virtual reality. In haptic interactions with a coarse model, the number of nodes near the haptic interaction region is too few to generate detailed deformation. Thus, local refinement techniques need to be developed. Many approaches have employed purely geometric subdivision schemes, but they are not proper in describing the deformation behavior of deformable objects. This paper presents a continuum mechanics-based finite element adaptive method to perform haptic interaction 'with a deformable object. This method superimposes a local fine mesh upon a global coarse model, which consists of the entire deformable object. The local mesh and the global mesh are coupled by the s-version finite element method (s-FEM), which is generally used to enhance accurate solutions near the target points even more. The s-FEM can demonstrate a reliable deformation to users in real-time.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2001년도 가을 학술발표회 논문집
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• pp.34-42
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• 2001

In this paper, we study on a modified mesh generation method based on the pollution error estimate. This method is designed for the control of the pollution error in any patch of elements of interest. It is a well-known fact that the pollution error estimates are much more than the local one. Reliable a posteriori error estimation is possible by controlling the pollution error in the patch through proper design of the mesh outside the patch. This design is possible by equally distributing the pollution error indicators over the mesh outside the patch. The conventional feedback pollution-adaptive mesh generation algorithm needs many iterations. Therefore, the solution time is significant. But we use the remeshing scheme in the proposed method. We will also show that the pollution error reduces less than the local error.

• 동아시아경상학회지
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• 제3권3호
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• pp.27-34
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• 2015

The authors consider, that the effectiveness of the government's activity, the improvement of decisions' quality depends on implementation of modern innovative technologies through activation the direct and feedback connection between public authority system and the business -community, through increasing the level of their collaboration by participating in solving main social problems and discu ssing innovative projects (initiative) according questions about socio-economic development of the country, improving the system of the state and local government in the Republic of Kazakhstan.

• 소음진동
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• 제10권6호
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• pp.1083-1093
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• 2000

이 논문은 지능구조물의 실시간 적응진동제어를 위해 유전자 알고리즘을 이용하여 Positive Position Feedback(PPF) 제어기를 조정하는 것과 관련이 있다. 유전자 알고리즘은 최적변수를 찾는데 있어 국소 최소점이 아닌 전체적인 최적점을 찾을 수 있는 능력이 있다. PPF 제어기는 다른 진동모드에 영향을 주지 않으면서 특정 진동모드의 감쇠를 증가시킬 수 있는 장점을 가지고 있는 반면에 효과적인 진동제어를 위해서는 제어하고 자하는 진동모드의 고유진동수를 정확히 알아야하는 단점이 있다. 본 연구에서는 유전자 알고리즘을 이용하여 실시간으로 PPF 제어기가 필요로 하는 변수값을 추적할 수 있는 알고리즘을 개발하여 그 타당성을 실험으로 증명하였다. 실험결과는 PPF 제어기의 실시간 조정이 성공적으로 이루어져 진동제어가 효과적으로 이루어졌음을 보여주고 있다.