다이아그리드 구조시스템의 접합부개발과 성능평가

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.

물류창고용 매입형 합성보(RCH Girder)의 휨성능 평가

이세정(Lee, Se Jung),정경수(Chung, Kyung Soo),방중석(Bang, Jung Seok),채흥석(Chae, Heung Suk),최성모(Choi, Sung Mo) 한국강구조학회 2022 한국강구조학회 학술대회 발표집 Vol.33 No.1

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.

강건최적설계에서 목적함수의 강건성 지수에 대한 연구

이세정(Se-Jung Lee),정성범(Seong-Beom Jeong),박경진(Gyung-Jin Park) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.5

강건최적설계의 개념은 다구찌 법에 근간을 두고 있다. 특히, 목적함수의 강건성 지수들은 설계 변수나 파라미터의 변동에 둔감하고 보수적인 설계를 추구한다. 그 목적을 달성하기 위해 다양한 강건성 지수들이 소개되고 있다. 소개된 다양한 지수와 방법은 나름의 목적과 의미를 지니고 있다. 하지만, 다구찌 법에서 의미하는 강건설계의 의미를 목적함수의 강건성 지수로 반영하여 최적설계 문제로 확장하는 것에는 한계점이 발생할 수 있다. 본 논문의 목적은 기존 강건성 지수 연구들의 특징과 한계점을 파악하고 강건최적설계 연구의 고찰을 수행하는데 있다. 목적함수의 강건성 지수들의 특징을 확인하기 위해 결정론적 최적해와 강건해의 구분이 명확한 수학적 예제를 사용하여 평가를 수행하고 분석하였다. 더불어, 고찰을 토대로 강건최적설계에서의 강건성에 대한 새로운 관점과 상한함수를 사용한 목적함수 의 강건성 지수를 제시하였다. The concept of robust optimization is based on Taguchi’s method. Especially, robustness indices of objective function pursue an insensitive and conservative design when there are variations on design variables and parameters. To accomplish the purpose, various robustness indices on the objective function have been developed. However, it can be caused limitations to develop the robustness index, because there is difference between the Taguchi’s method and robust optimization. In this paper, an investigation is performed to identify the characteristics and the drawbacks of the previous studies. To achieve the purpose, evaluations are conducted by using the examples which have both a deterministic optimum and a robust optimum. Moreover, a new viewpoint as well as a robustness index using a supremum value of the objective function is proposed based on the investigation.

공리적 설계를 이용한 매립형 공기조화시스템의 분석

이세정(Se-Jung Lee),홍을표(Eul-Pyo Hong),김대환(Dae-Whan Kim),김수옥(Su-Ok Kim),박경진(Gyung-Jin Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

The mount type HAVC control system is a type of an HAVC control system which is installed between a ceiling and ceiling boards of a room to control room temperature. Although the device is quite popular, design is conducted by a conventional way where engineering intuition and experiences are utilized. It is found that the design process is fairly inefficient and time-consuming because there are a lot of feedbacks. The axiomatic approach is used to investigate the design characteristics of the mount type HAVC control system and the Independence Axiom is utilized for the investigation. The Overall hierarchy is established up to the level of parts. It is found that the current design has many coupled and redundant aspects. The hierarchy is reorganized based on the Independence Axiom and a new design process is found. To exploit the new design process in practice, a design manual is made.

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.

데이터센터 비내력벽용 합성강판벽의 개요 및 시공사례 연구

이세정(Lee, Se Jung),이호정(Lee, Ho Jeong),전진우(Jeon, Jin Woo),정경수(Chung, Kyung Soo),쵬성모(Choi, Sung Mo) 한국강구조학회 2023 한국강구조학회 학술대회 발표집 Vol.34 No.6

무생물의 역의인화에 대한 고찰

이세정(Lee, Se Jung) 한국전시산업융합연구원 2016 한국과학예술융합학회 Vol.26 No.-

가전체 소설은 국내 고전문학 양식 가운데 장르의 규정 및 명칭과 관련하여 오랜 시간 논란의 중심에 있어왔다. “가전”, “가전체 소설”, “의인문학”, “의인체 소설”, “우언문학” 등의 다양한 이름으로 불리어지는 것이 이를 반증한다. 이 문제에 대한 연구자들의 논의의 쟁점을 살펴보면, 그중 가전체 소설의 인물 캐릭터와 내러티브의 특수성에 대한 언급을 찾아볼 수 있다. 곧 가전체 소설 속 인물캐릭터의 의인화 방법은, 우화(寓話)류의 의인화 방법과 다르게, 의인화의 방향이 완전히 반대로 되어 있음을 거론한 것이다. 따라서 연구자들은 의인화의 대상과 주체가 전혀 반대로 구성되어 있는 가전체 소설을 “가전체적 방법”이라는 말로 기술하여, 우화(寓話) 소설의 의인화와 구분하였다. 그러나 이는 의인화 방향의 전환을 염두에 둔 분석과 규정은 아니다. 가전체 소설의 중요한 장르적 특성을 의인화 방향의 전환에 두기 보다는, 의인화의 대상을 대나무, 술, 돈, 종이, 지팡이, 사람의 심성 등의 무정물들로 삼는 것에 둔 것이다. 이에 본 논문에서는 가전체 소설에서 나타나는 의인화의 방향 전환을 ‘역(逆)의인화’로 규정하고 가전체 소설 속 역(逆)의인화 캐릭터를 분석하였다. 아울러 영화 <엑스맨>의 역(逆)의인화 캐릭터를 분석하고 그 결과를 가전체 소설의 그것과 비교분석하였다. 그 결과 가전체 소설과 영화 <엑스맨> 무생물 역(逆)의인화 캐릭터는 다음 세 가지 기준으로 분석된다. 1) 콘텐츠 대상의 분류 2) 콘텐츠의 주요성향 3) 주 캐릭터와 보조캐릭터의 연계성 콘텐츠 대상의 분류를 기준으로 가전체 소설은 사물을 영화 <엑스맨>은 무형물을 주로 역의인화 대상으로 삼았다. 또한 콘텐츠의 주요성향을 기준으로 가전체 소설은 상징성, 영화 <엑스맨>은 영웅성을 주요 성향으로 삼는다. 마지막으로 주 캐릭터와 보조 캐릭터의 연계성을 기준으로 가전체 소설은 주 캐릭터의 분류기준과 보조 캐릭터의 분류기준이 강한 상관성을 가지고 있었으며 이에 반해 영화 <엑스맨>은 주 캐릭터의 분류기준과 보조 캐릭터의 분류기준이 주목할만한 상관성을 가지고 있지 않는 것으로 분석되었다. Gajeon fiction has been at the center of a long time controversy regarding the rules and names of genres among domestic classical literary styles. It is said that various names such as "household appliances," "household appliances novels," "humanities," "human novels," and " The issue of the researchers" discussion on this issue can be found in the reference to the character of narrative novel and the specificity of narrative. That is, the method of personification of character characters in the household electric novels is different from the method of personification of fables, and the direction of personification is completely reversed. Therefore, the researchers distinguished the fictionalized novel, which is composed of the opposite object of the personification and the subject, from the personification of the fable novel. However, this is not an analysis and regulation with a view to changing the direction of personification. Rather than putting the important genre characteristics of the Gajeon fiction into the conversion of the personification direction, the object of the personification is to make the objects of the anthropomorphism such as bamboo, liquor, money, paper. Therefore, in this paper, the direction of the personification in the Gajeon fiction is defined as the "reverse personification" and the character of the person in the household is analyzed. In addition, I analyze the reverse personification character of the movie "X-man" and compare the result with that of the electronic novel. As a result, it is analyzed according to the following three criteria. 1) Classification of content objects 2) Main tendency of content 3) Relationship between main character and auxiliary character Based on the classification of the content object, the Gajeon fiction made the object "movie" and the "X-man" made the intangible object mainly the object of reverse personification. Also, based on the main tendency of the contents, the fictional novel is symbolic, and the movie "X-Men" is heroic. Finally, based on the linkage between the main characters and the auxiliary characters, there was a strong correlation between the classification criteria of the main characters and the classification criteria of the auxiliary characters, while the movie <Xman> was classified into the main character classification and the auxiliary character classification The criterion was analyzed to have no significant correlation.

치과위생사의 자아존중감과 윤리적 성향과의 관련성

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.