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급결제를 사용한 외장재용 3D 프린팅 콘크리트의 강도 특성
서대석(Dae-Seuk Seo) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.2
본 연구는 최근 증가하고 있는 건축물의 다양한 외벽 형상에 따라 적용이 가능한 비정형 건축물에의 적용을 위해 3D 프린팅 기법을 적용한 외장재의 제조를 위한 기초 연구로서 진행하였다. 3D 프린팅 외장재의 출력성과 적층성의 확보를 위하여 3D 프린팅 콘크리트를 몰드에 타설한 시험체와 급결제를 사용한 출력물 시험체의 단위중량과 강도특성을 분석하였다. 몰드에 타설한 콘크리트의 단위중량에 비하여 급결제를 사용한 3D 프린팅 콘크리트의 단위중량이 3.5%~5.0% 정도 감소하는 경향을 나타내었고, 압축강도는 몰드에 타설한 콘크리트의 압축강도에 비하여 3D 프린팅을 통한 출력물의 압축강도는 36%~46%정도 감소하는 경향을 나타냈다. 휨강도의 경우 몰드에 타설한 콘크리트의 압축강도에 비하여 3D 프린팅을 통한 출력물의 압축강도는 36%~46%정도 감소하는 경향을 나타냈다. 급결제를 사용한 3D 프린팅 콘크리트의 강도 특성에 관한 영향은 2.0~5.8%정도 감소하는 경향을 나타냈다. 따라서, 3D 프린팅 출력시 급결제의 사용에 따른 강도 특성에 영향은 출력에 의한 강도 특성의 감소 보다 적은 것으로 나타나 3D 프린팅 외장재 제조시 급결제의 사용이 가능한 것으로 판단된다. In this study, the output results of 3D printed exterior materials for application to buildings of various shapes are output tests using test specimens, in which 3D printing concrete is cast in a mold and accelerating agents are used to ensure stackability. The unit weight and strength characteristics of the body were analyzed. Compared to the unit weight of concrete placed in the mold, the unit weight of 3D printing concrete using accelerating agents tends to decrease by approximately 3.5% to 5.0%, and the compressive strength is the compressive strength of the concrete placed in the mold. In comparison, the compression strength of the output by 3D printing tended to decrease by approximately 36% to 46%. In the flexural strength, the compressive strength of the output through 3D printing decreased by approximately 36% to 46% compared to the compressive strength of concrete placed in the mold. The impact on the strength characteristics of 3D printed concrete using accelerating agents tended to decrease by approximately 2.0 to 5.8%. Therefore, 3D printing output accelerating agents can be used.
서대석(Dae-Seok Seo),장영은(Young-Eun Jang) 충남대학교 사회과학연구소 2012 사회과학연구 Vol.23 No.4
The purpose of this study was to examine factors affecting ethical management of the elderly care facilities. The data were obtained from 294 of the nation’s 4,166 elderly care facilities. Analysis of the data showed that highest elderly care facilities, the ethical management of the sub-elements for employees was ethical and principals careers, previous job, materialism, idealism inclination, the pressure on performance, ethical climate, the pressure on the competition, government regulation affecting ethical management was a factor. Based on the research findings, the following practical implications suggested. social worker’s career included in the eligibility criteria of center directors and hype the elderly care facilities revenue models that are regulated, and ethics training for employees, and operational support enforcement, and should be the appropriate government regulatory agency situation.
자원봉사활동이 청소년 복지의식에 미치는 영향에 관한 연구
서대석(Dae Seok Seo) 한국청소년문화연구소 2013 청소년 문화포럼 Vol.- No.33
The purpose of this study identify any impact on the consciousness of the welfare of the youth volunteering. The target of the study in 32 of Gyeonggi-do, volunteer work and volunteer in the center of the 178 high school students. Analysis, was the welfare of the youth level of consciousness was good, welfare status, welfare recipient, welfare target service area, contact, whether total service career, regular participation variables had a significant impact on the welfare conscious. Measures to improve the welfare of the youth consciousness raising, volunteer and club activities and expansion of the service area associated with social welfare, the welfare of the subjects, and to meet directly serve the habit is to actively participate.
노인복지관 사회활동이 노화불안에 미치는 영향과 자기효능감의 매개효과
서대석 ( Daeseok Seo ) 아시아문화학술원 2018 인문사회 21 Vol.9 No.4
본 연구는 노인복지관 사회활동이 자기효능감을 매개로 노화불안을 감소시키는데 효과가 있음을 밝히기 위함이다. 조사대상은 경기도의 58개 노인복지관 중 설문에 협조한 7곳의 이용자들이고 총 390명이 참여했으며, 분석은 다중회귀분석을 활용한 매개효과검증을 사용하였다. 분석결과, 자기효능감이 노인복지관 사회활동 기간과 노화불안 사이에서 부분매개효과를 보였으며, 사회활동 빈도와 노화불안에서는 완전매개효과가 나타났다. 이를 바탕으로, 노인복지관은 개별 이용자들에게 노화불안 수준을 측정하고 그에 따라 프로그램을 안내할 필요가 있으며, 사회활동을 반복적이고 오랫동안 참여할 수 있는 기반을 마련해야 할 것이고, 지역사회 내 노인 사회활동 네트워크를 구축할 필요가 있음을 제언하였다. The purpose of this study is to clarify that the social activities of elderly welfare centers are effective in decreasing aging anxiety through self-efficacy. The subjects were 58 elderly welfare centers in Gyeonggi-do. Among them, 7 were cooperated in the questionnaire. A total of 390 users participated in the questionnaire. The analysis used mediating effect analysis using multiple regression analysis. The results showed that the self-efficacy showed a partial mediating effect between the elderly welfare center social activity period and the aging anxiety, and the full mediation effect was observed in social activity frequency and aging anxiety. Based on this, the elderly welfare center needs to measure the aging anxiety level for individual users and guide the program accordingly, and it should establish a basis for repetitive and long time participation in social activities, And suggest that it is necessary to establish a network of social activities for the elderly in the local community.
패분을 혼입한 콘크리트의 물리ㆍ역학적 특성 및 내산성에 관한 실험적 연구
서대석 ( Seo Dae Seuk ),민정기 ( Min Jeong Ki ),정현정 ( Jung Hyun Jung ),남기성 ( Nam Ki Sung ),성찬용 ( Sung Chan Yong ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
This study is performed to evaluate the physical and mechanical properties and acid-resistance of oyster shell concrete. The result shows that the unit weights of concrete with oyster shell are decreased by 1~2% than that of the normal· cement concrete. The highest strength is achieved by 2.5% oyster shell filled oyster shell concrete, it is increased compressive strength by 4%, tensile strength by 6% and bending strength by 7% than that of the normal cement concrete, respectively. The acid-resistance is increased with increase of the content of oyster shell. It is 1.6 times of the normal cement concrete by 15% oyster shell filled oyster shell concrete. Accordingly, oyster shell concrete will improve the properties of concrete.