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세 가지 평면 형상에 따른 비틀림 비정형 빌딩구조물의 지진응답 분석
이다혜,김현수,강주원,Lee, Da-Hye,Kim, Hyun-Su,Kang, Joo-Won 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.4
In this paper, a twisted shape structure with an elevation form favorable to the resistance of vibration caused by wind loads is selected from among the forms of high-rise buildings. The analytical model is a square, triangular, and hexagonal plane with a plane rotation angle of one degree from 0 to 3 degrees per each story. As a result of the analysis, as the twist angle increased, story drift ratio is increased. Responses with different eccentricity rates were shown by analytical models. Therefore planar shapes designed symmetrically to the horizontal axis of X and Y are considered advantageous for eccentricity and torsion deformation. In the case of the bending moment of the column, the response was amplified in the column supporting the base floor, the roof floor, the floor in which the cross-section of the vertical member changes, and the floor having the same number of nodes as the base floor. Finally, the axial force response of the column is determined to be absolutely affected by the gravity load compared to the lateral load.
COVID-19가 유발한 사회재난이 소비자물가지수에 미치는 영향: 문화체육관광분야를 중점으로
이다혜,장인홍,Lee, Da-Hye,Chang, In-Hong 조선대학교 기초과학연구원 2021 조선자연과학논문집 Vol.14 No.3
The outbreak of COVID-19 has had a huge impact on human life. The World Bank group (WBG) has stated that 2020 is the worst year since World War II for economic growth. An epidemic of an infectious disease such as COVID-19 is classified as a "social disaster" by law. The social disaster caused by COVID-19 puts certain industries, occupations and vulnerable groups at risk of exclusion and isolation. This paper intends to examine the fluctuations in the consumer price index in the cultural, sports and tourism sector before and after the onset of COVID-19. In addition, it predicts the consumer price index by sector until December 2021 and reveals its implications.
비틀어진 형상(Twisted)을 가지는 고층 구조물의 역학적 특성 분석
이다혜,김현수,강주원,Lee, Da-Hye,Kim, Hyun-Su,Kang, Joo-Won 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.4
In this study, structural characteristics were analyzed by combining gravity load and lateral loads such as seismic loads through static analysis of example structures, and the static characteristics of the twisted structure according to the plane rotation angle were also analyzed. Example structures were selected as regular structure, and twisted structures; 1.0, 2.0, and 3.0 degree angle of rotation per story, and static analysis was performed by the load combination case 1 and case 2. As a result the story drift ratio of the twisted-shaped structure also increased as the plane rotation angle per story increased. The eccentricity according to the load combination was the highest in the lower stories of all analysis models, and the eccentricity was found to be larger as the rotation angle decreased. The twisted-shaped structure was more responsible for the bending moment of the column than the regular structure, and the vertical member axial force of all analysis models was almost similar.
비틀어진 형상(Twisted) 고층 구조물의 평면 회전 각도별 동적 응답 분석
이다혜,김현수,강주원,Lee, Da-Hye,Kim, Hyun-Su,Kang, Joo-Won 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.1
In this paper, the dynamic response was analyzed by performing linear dynamic analysis using historic earthquake loads on twisted-shaped structures and fixed structure among free-form high-rise structures with atypical elevation shape following prior studies. In addition, the dynamic characteristics of the analysis models according to the plane rotation angle of the twisted structure were compared and analyzed. As a result of the analysis, as the plane rotation angle of the twisted structure increased, the interlayer deformation rate increased in the high-rise part of 50th floors or more. The story shear force and the story absolute acceleration were similar in the entire structure. In the case of the story shear force, the response of the twisted shape model was rather reduced in the middle part. As a result of analyzing the dynamic response, the vulnerable layer where the response amplification of the twisted structure occurs was found to be 31st story.
미이용 초본계 바이오매스 활용을 위한 반탄화 기술 리뷰
이다혜(Da-Hye Lee),강태진(Tae-Jin Kang),김효식(Hyo-Sik Kim),이진희(Jin-Hee Lee),이예지(Ye-Ji Lee),이수출(Soo-Chool Lee),강석환(Suk-Hwan Kang) 한국열환경공학회 2022 열환경공학 Vol.17 No.2
Biomass is a major carbon neutral energy source, but it is generally difficult to use as a fuel due to low energy density, high moisture content, and low heating value because of hydrophilicity. As one of the methods for overcoming these problems of biomass, research on torrefaction is continuously being performed. Through torrefaction, high energy density characteristics can be obtained by increasing the carbon content in the biomass, and moisture in the biomass can be removed, hydrophilicity can be changed to hydrophobicity, and the heating value can be increased. In addition, since a grindability of torrified biomass is improved, energy consumption is reduced 3 to 7 times when pulverizing biomass, thereby reducing costs of storage and transportation. In the domestic torrefied biomass market, laboratory-scale tests are being conducted in universities, but development for commercialization and demonstraion is still insignificant. In EU, demonstraion and commercial scale torrefaction technologies such as rotary drum, screw, moving bed, fluidized bed, multi-stage furnace, and conveyor belt types are being developed. This study analyzed the characteristics and R&D trends of biomass torrefaction technology, an upgrading fuel conversion technology from wasted herbaceous biomass for sustainable development.
대학 교양무용 참여에 따른 자기효능감 및 전공몰입 변화
이다혜 ( Da-hye Lee ),문영 ( Young Moon ) 대한무용학회 2018 대한무용학회논문집 Vol.76 No.2
This study empirically explored changes in self-efficiency and major-commitment according to participation in the college liberal arts dance program to promote the role of dance education corresponding to changes in the paradigm and demands of the times in college liberal education that the students could adapt themselves to various occupational environments as the members of society in the future.