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이세정,이성희,김진호,최성모,Lee, Se-Jung,Lee, Seong-Hui,Kim, Jin-Ho,Choi, Sung-Mo 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.2
Recently, High-rise building are irregular-shaped to be city landmarks and function as vertical cities to enable the efficient use of land. 3T (Twisted, Tilted & Tapered) designs are being suggested for irregular buildings and studies to develop new structural system have been actively made to satisfy slender shape ratio. In diagrid system, not only gravity load but also lateral load is delivered based on the triangular shape of diagrid, so most of columns are eliminated. Because shearing force is delivered by the axial behavior (tensile/compressive) of diagrid to minimize shearing deformation, the system is more applicable to irregular buildings than existing system where shearing force is delivered by the columns. In this study, the process of selecting connection details and the structural safety of the selected details are verified using the finite element analysis with focus given to the construction overview of the Cyclone Tower. However, the relersed methods of stress concentration are suggested and the performance of stress concentration relieves that it's suggested for the appropriate cap plate thickness and extended length. 최근 초고층 건축물은 비정형적 외관을 갖는 랜드 마크적인 역할과 택지의 효율적인 사용을 위한 수직 도시 기능을 수행한다. 건축물의 외관은 비정형적인 요소로서 3T형태(Twisted, Tilted, Tapered)의 설계안들이 대부분 제안되고 있으며, 세장한 형태의 형상비를 만족하기 위한 새로운 구조시스템의 연구 개발이 활발히 진행 중이다. 다이아그리드 시스템의 하중 전달 메커니즘은 대각 가새(Diagrid)의 삼각형 형상에 기인하여 중력하중 뿐만 아니라 횡하중을 전달하기 때문에 대부분의 기둥이 제거되게 된다. 또한 대각 가새의 축방향 거동(인장/압축)에 의해 전단력을 전달하여 전단 변형이 최소화되기 때문에 기둥이 전단력을 전달하던 기존 방식에 비해 비정형적인 외관에 쉽게 대응할 수 있는 구조시스템이다. 본 연구에서는 싸이클론 타워의 건축 계획안을 바탕으로 접합부 디테일 선정 과정과 접합부의 구조안전성을 유한요소해석을 통해 검증하였다. 이를 통해 응력집중 완화 방안을 제시하여 적절한 캡 플레이트 두께와 캡플레이트 확장 길이를 제시하여 응력집중 현상을 완화하였다.
SN 강재를 이용한 엔드플레이트항복형 보-기둥접합부의 구조 거동
이세정,채흥석,이성희,김진호,최성모,Lee, Se-Jung,Chae, Heung-Suk,Lee, Seong-Hui,Kim, Jin-Ho,Choi, Sung-Mo 대한건축학회 2011 대한건축학회논문집 Vol.27 No.6
In End-Plate connection, End-Plate and beam are welded in a factory and fastened with bolts in the field. End-Plate connection, one of Partial Rigid Connections(PR) has been observed the structural behavior and deformation performance equivalent to Full Rigid Connections(FR). Four impossible failure modes of End-plate connection subjected to hysteresis behavior are categorized into the plastic deformation in the End-Plate and the beam yielding, the bolt failure, the brittle failure of weld section, The beam yielding and plastic deformation in the End-Plate can perform the enough ductility behavior and inelastic deformation, while the bolt failure and brittle failure of weld section can not perform it. It is important that End-Plate connection prevents the brittle failure and procures the reliability of connection. In this paper, it is propose to occur the plastic deformation in the End-Plate and to procure the reliability of connections. Therefore, we suggested End-Plate yielding connections using only End-Plate for New Steel(SN Steel) limited between upper and lower yield point in order to obtain the enough ductility behavior and End-Plate inelastic deformation.
전역 최적화 문제의 효율적인 해결을 위한 근사최적화 기법
이세정(Se Jung Lee) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.5
Most engineering design problems require analyses or simulations to evaluate objective functions. However, a single simulation can take many hours or even days to finish for many real world problems. As a result, design optimization becomes impossible since they require hundreds or thousands of simulation evaluations. The surrogate-based optimization (SBO) strategy became a remedy for such computationally expensive analyses and simulations. A surrogatebased optimization strategy has been developed in this study in order to improve global optimization performance. The strategy is a heuristic algorithm and it exploits not only multiple surrogates, but also multiple optimizers. Multiple optimizations of multiple surrogate models yield multiple candidate design points of optima. During the sequential sampling process, the algorithm ranks candidate design points, selects the points as many as specified, and builds the improved surrogate model. Various mathematical functions with different numbers of design variables are chosen to compare the proposed method with the other most recent algorithm, MSEGO. The proposed method shows superior performance to the other method.
SN 강재를 이용한 엔드플레이트항복형 보-기둥접합부의 구조 거동
이세정(Lee Se-Jung),채흥석(Chae Heung-Suk),이성희(Lee Seong-Hui),김진호(Kim Jin-Ho),최성모(Choi Sung-Mo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.6
In End-Plate connection, End-Plate and beam are welded in a factory and fastened with bolts in the field. End-Plate connection, one of Partial Rigid Connections(PR) has been observed the structural behavior and deformation performance equivalent to Full Rigid Connections(FR). Four impossible failure modes of End-plate connection subjected to hysteresis behavior are categorized into the plastic deformation in the End-Plate and the beam yielding, the bolt failure, the brittle failure of weld section, The beam yielding and plastic deformation in the End-Plate can perform the enough ductility behavior and inelastic deformation, while the bolt failure and brittle failure of weld section can not perform it. It is important that End-Plate connection prevents the brittle failure and procures the reliability of connection. In this paper, it is propose to occur the plastic deformation in the End-Plate and to procure the reliability of connections. Therefore, we suggested End-Plate yielding connections using only End-Plate for New Steel(SN Steel) limited between upper and lower yield point in order to obtain the enough ductility behavior and End-Plate inelastic deformation.
이세정 ( Se Jung Lee ),한경순 ( Gyeong Soon Han ) 한국치위생과학회 2012 치위생과학회지 Vol.12 No.5
The aim of this study was to the self-concept and ethical propensity of dental hygienists. The subjects of this study were 748 dental hygienists from January 23 to March 30, 2012. Data were analyzed with t-test, one-way ANOVA, Pearson``s correlation, and stepwise multiple regression analysis SPSS 19.0. The average score of self-concept was 3.44 points in dental hygienists. The self-concept scores were higher in absolutists (3.53 points) and situationists (3.51 points) than subjectivists (3.35 points) and exceptionists (3.35 points) in the ethical types. The self-concept Influence factors were idealism, relativism, job satisfaction level, and annual salary. In order to help dental hygiene students adopt to rapidly changing society, the university should make efforts to develop a curriculum and program for improving self concept and ethical propensity.
임상치과위생사의 윤리적 성향과 전문직업성 및 윤리적 직무행동
이세정 ( Se Jung Lee ),한경순 ( Gyeong Soon Han ) 대한예방치과·구강보건학회 2012 大韓口腔保健學會誌 Vol.36 No.3
Objectives: The aim of this study was to the ethical propensity, professionalism, and ethical job behavior of dental hygienists. Methods: The subjects of this study were 748 dental hygienists, who are working at various types of dental hospitals and clinics around the country, from January 23 to March 30, 2012. Data were analyzed with a t-test, one-way ANOVA, Chi-square, and Stepwise multiple regression analysis SPSS 19.0. Results: As for the ethical propensity of dental hygienists, their idealism scores were 3.87, which was higher than their relativism scores. The ethical job behavior and professionalism scores were higher in absolutists (3.80, 3.40 points) and situationists (3.77, 3.44 points), than subjectivists (3.49, 3.19 points) and exceptionists (3.38, 3.09 points) in the ethical types. The ethical job behavior and professionalismrelated common Influence factors was idealism. Conclusions: The absolutists and situationists with a high tendency of idealism were high in the level of professionalism and ethical job behavior, according to the ethical types.