하중법을 이용한 텐세그리티 구조물의 자기평형 응력 탐색

정우성,이재홍,강주원,Chung, Woo-Sung,Lee, Jae-Hong,Kang, Joo-Won 한국공간구조학회 2011 한국공간구조학회지 Vol.11 No.4

본 논문에서는 제약조건이 고려된 텐세그리티 구조물의 형상 탐색 방법에 있어서 기존의 하중법을 특이값 분해로 정식화 한 새로운 하중법을 제안하였다. 텐세그리티 구조물은 형태의 안정성 유지를 위해 프리스트레스가 도입 되어야하며 이를 위하여 형상 탐색이 수행되어 진다. 또한 실제 구조물로서 활용되기 위해서는 제약조건이 고려되어야한다. 기존의 하중법은 어려운 구조적 개념이 필요하지 않아 접근 방법이 쉽지만 많은 수식을 통해 형상 탐색을 수행하여야 하므로 이로인해 수지상의 오류가 발생할 수 있으며 내력 밀도법을 사용하여 형상 탐색을 수행 할 경우 제약조건에 맞는 가상의 부재(Dummy Element)를 찾는 것이 어렵다는 단점이 있다. 본 연구에서는 기존의 하중법에서 사용하던 수식을 특이값 분해로 정식화하여 수치적 오류를 줄일 수 있는 새로운 하중법을 제안하였다. This paper presents a new numerical method by using Singular Value Decomposition force method for form-finding of tensegrity structures with constraints. In order to maintain the tensegrity structures stable, state of self-equilibrium stress should be introduced. The existing force method has some advantages about form-finding of tensegrity structures. However, this method has complex formulation. In force density method, dummy members are required for form -finding of tensegrity structures with constraints. Therefore this study proposes new force method using Singular value decomposition. The proposed method is both having easy basic consept and simple computation than existing force method. A numerical example is presented to demonstrate the efficiency and robustness in searching initial single integral feasible self-stress mode for tensegrity structures with constraints.

특이값 분해에 기반하는 하중법을 이용한 텐세그리티 구조물의 형상탐색

정우성,이재홍,Chung, Woo-Sung,Lee, Jae-Hong 대한건축학회 2011 대한건축학회논문집 Vol.27 No.12

This paper presents a new numerical method by using SVD force method for force-finding of tensegrity grid structures. In order to maintain the tensegrity structures stable, state of self-equilibrium stress should be introduced. The Force method is generalized to all types of skeletal structures, such as rigid-jointed frames, pin-jointed planar trusses and ball-jointed space trusses. Therefore this study proposes new force method using Singular value decomposition. The proposed method is both having easy basic consept and simple computation than existing force method. And a discussion on proper division of number of member groups for the purpose of existence of a single integral feasible self-stress mode has been explicitly given. Several numerical examples are presented to demonstrate the efficiency and robustness in searching initial single integral feasible self-stress mode for tensegrity grid structures.

특이값 분해로 정식화 된 하중법을 이용한 텐세그리티 구조 해석

정우성(Chung Woo-Sung),이재홍(Lee Jae-Hong) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)

This paper presented structural analysis of tensegrity system by using Force Method based on singular value decomposition. This structures composed of discontinuous compressive elements and continuous tensile elements have been employed as lightweight, large roofs. The previous researches were required to perform form-finding. This was because the tensegrity structure had to satisfy the self-equilibrium in each node of the structure. However, the method presented in this paper made it possible to analyze the structural analysis without form-finding. This method was easy, fast and accurate without complicated equations performing form-finding as compared to other methods. In this paper proposes new force method using singular value decomposition, which is both having easy basic concept and simple computation than existing force method.

특이값 분해에 기반하는 하중법을 이용한 텐세그리티 구조물의 형상탐색

정우성(Chung, Woo-Sung),이재홍(Lee, Jae-Hong) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.12

This paper presents a new numerical method by using SVD force method for force-finding of tensegrity grid structures. In order to maintain the tensegrity structures stable, state of self-equilibrium stress should be introduced. The Force method is generalized to all types of skeletal structures, such as rigid-jointed frames, pin-jointed planar trusses and ball-jointed space trusses. Therefore this study proposes new force method using Singular value decomposition. The proposed method is both having easy basic consept and simple computation than existing force method. And a discussion on proper division of number of member groups for the purpose of existence of a single integral feasible self-stress mode has been explicitly given. Several numerical examples are presented to demonstrate the efficiency and robustness in searching initial single integral feasible self-stress mode for tensegrity grid structures.

주기 구조를 이용한 Partial H-plane Filter

김동진,정우성,이정해,Kim Dong-Jin,Chung Woo-Sung,Lee Jeong-Hae 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.8

In this paper, a compact partial H-plane filter with periodic structure is proposed. Guided wavelength of periodic structure' is reduced by slow wave effect. Cross-section and length of partial H-plane filter with periodic structure are considerably reduced by 75% and 30%, respectively, as compared with conventional E-plane filter. In addition, spurious responses of the bandpass filter are improved. To design bandpass filter with periodic structure, we have analyzed a periodic structure of partial H-plane waveguide and derived equations of the periodic filter. Measured results are in good agreement with simulated results. 본 논문에서는 주기 구조를 이용한 소형화된 partial H-plane필터를 제안하였다. 주기 구조의 관내 파장은 저속파의 영향으로 인해 그 크기가 줄어든다. 주기 구조를 이용한 partial H-plane 필터는 일반적인 E-plane 필터보다 단면적과 길이가 각각 75%, 30% 축소되었다. 또한 대역 통과 필터의 스퓨리어스 응답 특성이 향상되었다. 주기 구조를 이용한 대역 통과 필터를 설계하기 위해 partial H-plane 도파로의 주기 구조가 해석되었고, 설계식이 유도되었다. 측정된 결과는 시뮬레이션 결과와 잘 일치함을 확인할 수 있었다.

폴리아닐린-이온성 액체 복합체의 물리적전기화학적 특성

방주용,정우성,박형순,정경호,이재준,차은희,이재관,Bang, Joo-Yong,Jeong, Woo-Sung,Park, Hyung-Soon,Chung, Kyung-Ho,Nath, Narayan Chandra Deb,Lee, Jae-Joon,Cha, Eun-Hee,Lee, Jae-Kwan 한국전기화학회 2010 한국전기화학회지 Vol.13 No.3

전도성 고분자로 널리 알려진 폴리아닐린과 액체전해질의 핵심 재료인 이온성 액체와의 복합체를 형성시키고 이들의 물리적, 전기화학적인 특성을 조사되었다. 이미다졸늄 이온성 액체 (1-methyl-3-propylimidazolium iodide, PMI-I)에 비전도성 폴리아닐린 (Emeraldine Base)을 30 wt%이상 첨가하였을 때 준고형화 현상이 나타났고, 이온성 액체의 이미다졸늄 양이온의 방향족 고리와 폴리아닐린의 벤족기와의 ${\pi}-{\pi}$ 자기상호조립에 의한 약한 도핑작용을 통해 섬유상 구조를 나타내었으며, 전도도의 변화율은 80%이상 유지하였다. Polyaniline-ionic liquid composite was prepared and investigated its physical and electrochemical properties. The quasi-solidification was presented in imidazolium-based ionic liquid (1-methly-3-propylimidazolium iodide, PMI-I) containing above 30 wt% of polyaniline (emeraldine base), which exhibited around 80% decrease of conductivity compared to pristine ionic liquid, resulting in fibril structure trough ${\pi}-{\pi}$ self-assembled of imidazolium aromatic ring of ionic liquid on polyaniline framework.

특이값 분해로 정식화 된 새로운 하중법을 이용한 입체 트러스 구조 해석

이수현,정우성,이재홍,Lee, Su-Hyun,Chung, Woo-Sung,Lee, Jae-Hong 한국전산구조공학회 2011 한국전산구조공학회논문집 Vol.24 No.5

본 논문에서는 트러스 구조 해석에 있어서 기존의 하중법을 특이값 분해로 정식화 한 새로운 하중법을 제안하였다. 하중법은 유한요소법을 이용한 트러스 구조 해석법과 달리 접근 방법이 쉬우며 어려운 구조적 개념이 필요하지 않아 일반적인 트러스 구조 해석에서 주로 사용된다. 또한 트러스 및 핀-조인트 골조와 같은 골조 시스템의 구조 해석에도 적용할 수 있어 매우 효과적인 방법이다. 하지만 하중법은 많은 수식을 통해 구조 해석을 수행하여야 하므로 이로 인해 수치상의 오류가 발생할 수 있다. 따라서 본 연구에서는 이러한 문제점을 보완하기 위하여 기존의 하중법에서 사용하던 수식을 특이값 분해로 정식화 한 새로운 하중법을 제안하였다. 이 방법을 사용하여 트러스 구조물을 해석할 경우 기존의 하중법의 기본개념을 그대로 이용하면서도 복잡한 수식을 사용하지 않고 해석을 수행할 수 있으므로 매우 효율적인 방법이다. In this paper presents new force method by using singular value decomposition. The existing force method has some advantages about analysis of truss structures such as it is easier basic concept than finite element method, which apply to analyze truss structures. However, this method has complex formulation for analysis. Therefore, in this study proposes new force method using singular value decomposition, which is both having easy basic concept and simple computation than existing force method. The proposed method is illustrated through numerical examples.

태양광 확보를 위한 국내외 건축법 비교 및 분석

허묘분(Hur, Myo-Boon),정우성(Chung, Woo-Sung),강미선(Kang, Mi-Seon) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.12

The purpose of this study is to analyze and compare current zoning regulations for solar access on a global scale. The sun is the essential source for heat and light in human-built environments. In urban planning and architectural design, therefore, access to sunlight has been a primary consideration since human beings have been creating built environments. The sun is also a significant replacement for current restrictive fuels. Since the energy crisis in the 1970s, increasing interest in solar energy has motivated many modern cities in the world to establish different methods for gaining sunlight access in modern building development. Zoning, a regulatory device defining the maximum volume of a building by its relationship with other buildings and with land use, has been applied as the best strategy to achieve this objective. In this study, twelve existing zoning laws and guidelines for solar access throughout the world were analyzed and compared. Case studies were initially classified by sunlight types. Next, the constraints, tools, and other considerations were investigated by type. Lastly, each classification was evaluated by urban development density, energy conversion, and energy savings. The information obtained from this study will be used as the fundamental data for improving zoning guidelines for solar access in Korea.

입자추적모델을 이용한 마산만 북부 해역에서의 육상오염물질 확산 수치모의

김진호(Jin-Ho KIM),정우성(Woo-Sung JUNG),홍석진(Sok-Jin HONG),이원찬(Won-Chan LEE),정용현(Yong-Hyun CHUNG),김동명(Dong-Myung KIM) 한국수산해양교육학회 2016 水産海洋敎育硏究 Vol.28 No.4

온라인 데이터베이스 서비스의 원가계산과 가격결정에 관한 실증적 연구

이영재(Lee Young Jai),정우성(Chung Woo Sung) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.1

Based on previous research for end-users information needs, this research is to investigate DB costing method decision-making on pricing of DB service by critical factors. The first phase of the research classifies the elements of DB product cost accounting by activities of the circulation system of information in DB service. The second phase is to develop model based on results of DB product costing in the first phase of research. The third phase of research is to present the process of DB product cost accounting by applying the model to an on-line service company. Finally, the research develops the pricing decision model to determine the priority of each factor by survey from major on-line service companies in America and Japan. It is essential to research further regarding the DB product costing and pricing methods in order to determine a proper DB service charge. The right pricing decision in the DB service charge will contribute to the growth of the DB industry.