• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2002년도 춘계학술대회 논문집
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• pp.276-288
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• 2002

본 논문은 학교 내에 설치된 학내망을 이용하여 구축된 인트라넷 환경에서 구축되어 있는 DB의 정보를 이용하는 학교의 구성원인 교수와 학생들이 좀더 쉽게 인트라넷에 구축되어 있는 정보를 확인하고 활용할 수 있는 메신저를 만들어 사용자 본인이 소속된 집단의 구성원의 정보를 확인할 수 있도록 하고 자신이 소속된 그룹 안에서 사용자가 선택한 범위의 인원들을 자동으로 친구로 등록 시켜주어 사용자가 일일이 친구를 추가하는 불편함을 줄여주고 인트라넷의 기능과 기타 추가 기능들을 통해 사용자의 인트라넷의 이용의 편의성을 제공하기 위한 연구이다.

• 디지털콘텐츠학회 논문지
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• 제5권1호
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• pp.41-47
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• 2004

본 논문은 요즘 급부상하고 있는 메신저 기능을 이용해서 학교 내에 구축된 교내 망의 인트라넷 환경에서 구축되어 있는 DB의 정보를 이용하는 학교의 구성원인 교수와 학생들이 좀더 쉽게 인트라넷에 구축되어 있는 정보를 확인하고 활용할 수 있는 메신저구현 및 활용에 관한 연구이다. 즉, 대학내의 구성원의 정보를 확인할 수 있도록 하고 자신이 소속된 그룹 안에서 사용자가 선택한 범위의 인원들을 자동으로 친구로 등록 하여 사용자가 일일이 친구를 추가하는 불편함을 줄여주고 인트라넷의 기능과 기타 추가 기능들을 통해 사용자의 인트라넷의 이용의 편의성을 제공하기 위한 연구이다.

• Structural Engineering and Mechanics
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• 제76권3호
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• pp.379-393
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• 2020

In this paper, we propose an automatic procedure to improve the accuracy of finite element solutions using enriched 2D solid finite elements (4-node quadrilateral and 3-node triangular elements). The enriched elements can improve solution accuracy without mesh refinement by adding cover functions to the displacement interpolation of the standard elements. The enrichment scheme is more effective when used adaptively for areas with insufficient accuracy rather than the entire model. For given meshes, an error for each node is estimated, and then proper degrees of cover functions are applied to the selected nodes. A new error estimation method and cover function selection scheme are devised for the proposed adaptive enrichment scheme. Herein, we demonstrate the proposed enrichment scheme through several 2D problems.

• 호남수학학술지
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• 제40권4호
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• pp.785-794
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• 2018

In [8] they introduced a new finite element method for accurate numerical solutions of Poisson equations with corner singularities. They consider the Poisson equations with homogeneous Dirichlet boundary condition with one corner singularity at the origin, and compute the finite element solution using standard FEM and use the extraction formula to compute the stress intensity factor, then pose a PDE with a regular solution by imposing the nonhomogeneous boundary condition using the computed stress intensity factor, which converges with optimal speed. From the solution they could get an accurate solution just by adding the singular part. This approach uses the polar coordinate and the cut-off function to control the singularity and the boundary condition. In this paper we consider Poisson equations with multiple singular points, which involves different cut-off functions which might overlaps together and shows the way of cording in FreeFEM++ to control the singular functions and cut-off functions with numerical experiments.

• 한국조리학회지
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• 제22권5호
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• pp.95-105
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• 2016

본 연구는 인디언시금치 열매를 이용한 건강 기능성 젤리 개발을 위해 인디언 시금치 열매 착즙액 20~80%를 첨가하여 젤리를 제조한 다음, 이화학적 및 관능적 특성을 평가하여 새로운 젤리 제품 개발 가능성을 살펴보았다. 당도는 인디언시금치 착즙액 $3.4^{\circ}Brix$로 나타났다. 색도는 첨가량이 증가할수록 명도 L값은 감소하였고, 적색도 a값과 황색도 b값도 첨가량이 증가할수록 감소하는 경향을 보였다. 인디언시금치 열매 착즙액의 DPPH radical 소거활성 측정 결과, 인디언시금치 열매 착즙액은 15.67 mg/mL로 나타났고, 총 폴리페놀 함량은 7.00 mg/g이었다. 인디언시금치 열매 착즙액 첨가량이 증가할수록 DPPH radical 소거활성과 총 폴리페놀 함량이 대조군보다 높게 나타났다. 텍스쳐에서 견고성은 인디언시금치 열매 착즙액 20% 첨가군에서 4.27%로 높은 값을 보였고, 점착성에서는20% 첨가군에서 2.48%로 높게 나타났으며, 80% 첨가군에서 0.91%로 낮게 나타났다. 관능검사 결과 색, 향, 단맛, 씹힘성, 촉촉한 정도, 전체적인 기호도 등에서 인디언시금치 열매 착즙액 40% 첨가군이 가장 높게 평가되었다. 이상의 결과로 인디언시금치 열매 착즙액 첨가 젤리 제조 시 인디언 시금치 열매 착즙액은 40%가 가장 적합하리라 사료되었다.

• East Asian mathematical journal
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• 제34권5호
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• pp.623-632
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• 2018

In [7, 8] they introduced a new finite element method for accurate numerical solutions of Poisson equations with corner singularities. They consider the Poisson equations with homogeneous boundary conditions, compute the finite element solutions using standard FEM and use the extraction formula to compute the stress intensity factor(s), then they posed new PDE with a regular solution by imposing the nonhomogeneous boundary condition using the computed stress intensity factor(s), which converges with optimal speed. From the solution they could get an accurate solution just by adding the singular part. Their algorithm involves an iteration and the iteration number depends on the acuracy of stress intensity factors, which is usually obtained by extraction formula which use the finite element solutions computed by standard Finite Element Method. In this paper we investigate the dependence of the iteration number on the convergence of stress intensity factors and give a way to reduce the iteration number, together with some numerical experiments.

• East Asian mathematical journal
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• 제36권5호
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• pp.583-591
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• 2020

In [8, 9] they introduced a new finite element method for accurate numerical solutions of Poisson equations with corner singularities. They consider the Poisson equations with corner singularities, compute the finite element solutions using standard Finite Element Methods and use the extraction formula to compute the stress intensity factor(s), then they posed new PDE with a regular solution by imposing the nonhomogeneous boundary condition using the computed stress intensity factor(s), which converges with optimal speed. From the solution they could get an accurate solution just by adding the singular part. The error analysis was given in [5]. In their approaches, the singular functions and the extraction formula which give the stress intensity factor are the basic elements. In this paper we consider the biharmonic problems with the cramped and/or simply supported boundary conditions and get the singular functions and its duals and find properties of them, which are the cornerstones of the approaches of [8, 9, 10].

• 한국어학
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• 제80권
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• pp.125-150
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• 2018

This paper discusses several prerequisites for recording other languages by using Hunminjeongum (Hangeul). The scientific, systematic, and practical features of Hunminjeongum is undoubtedly obvious. Such a view of Hunminjeongeum is based on its iconicity, featural property and non-linearity. However, the existing conviction that Hunminjeongeum can transcribe all human sounds or that Hunminjeongeum is the only script which is easy for anyone to learn requires a more rigorous consideration. Given the fact that all scripts can be evaluated as equal, without one being more superior than the other, all scripts are optimized for recording the language in its own given linguistic context. Further, the function of a script is not just limited in a simple representation of a language. Adding new letters into the system of Hunminjeongeum or maintaining its current mode of notation can be problematic. First, it is important to solve computer-related issues: the registration of Hunminjeongum into the computer system as well as its output, problems regarding unicode, the new developments required for input devices, keyboards, fonts, and computer programs.

• Structural Engineering and Mechanics
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• 제84권4호
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• pp.489-502
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• 2022

This paper is aimed at developing an optimization-based Finite Element model updating approach for structural damage identification and quantification. A modal flexibility-based error function is introduced, which uses modal assurance criterion to formulate the updating problem as an optimization problem. Because of the inexplicit input/output relationship between the candidate solutions and the error function's output, a robust and efficient optimization algorithm should be employed to evaluate the solution domain and find the global extremum with high speed and accuracy. This paper proposes a new multi-stage Selective Particle Swarm Optimization (SPSO) algorithm to solve the optimization problem. The proposed multi-stage strategy not only fixes the premature convergence of the original Particle Swarm Optimization (PSO) algorithm, but also increases the speed of the search stage and reduces the corresponding computational costs, without changing or adding extra terms to the algorithm's formulation. Solving the introduced objective function with the proposed multi-stage SPSO leads to a smart feedback-wise and self-adjusting damage detection method, which can effectively assess the health of the structural systems. The performance and precision of the proposed method are verified and benchmarked against the original PSO and some of its most popular variants, including SPSO, DPSO, APSO, and MSPSO. For this purpose, two numerical examples of complex civil engineering structures under different damage patterns are studied. Comparative studies are also carried out to evaluate the performance of the proposed method in the presence of measurement errors. Moreover, the robustness and accuracy of the method are validated by assessing the health of a six-story shear-type building structure tested on a shake table. The obtained results introduced the proposed method as an effective and robust damage detection method even if the first few vibration modes are utilized to form the objective function.

• 한국정보과학회논문지:정보통신
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• 제31권6호
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• pp.633-642
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• 2004

최근 유비쿼터스 컴퓨팅 환경의 등장에 따라, 사용자의 자주 변화하는 제약조건에 맞는 서비스를 제공하기 위해서 망 내에서의 문맥인식성을 고려한 자치적응성(self-adaptation)이 요구되고 있다 그러나 기존 망에 자치적응성 기능을 추가하고자 할 때 느린 망 표준화 문제와 느린 서비스 재배치 문제가 발생한다. 액티브네트워크는 이러한 문제점을 해결하기 위한 적합한 환경으로써 망에 새로운 자치 적응성을 추가하고 빠른 재배치를 할 수 있다. 그러므로 본 논문은 문맥인식성을 고려한 자치적응성 지원을 위해서 에이전트 기반 액티브네트워크와 제약조건 기반 SCE(Service Creation Environment)클 이용한 SAS(Self Adaptation Service)를 제안하였다. 본 SAS의 이점은 망 내에서 문맥인식(context-aware)을 고려한 서비스 지원과 빠른 서비스 재배치 지원이다.