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골재크기 및 섬유혼입률에 따른 강섬유 보강 콘크리트의 휨 성능
장석준,안경림,윤현도,Jang, Seok-Joon,Ahn, Kyung-Lim,Yun, Hyun-Do 大韓建築學會 2015 大韓建築學會論文集 : 構造系 Vol.31 No.2
This paper describes the effect of aggregate size and fiber volume fraction on flexural properties of steel fiber reinforced concrete(SFRC) with specified compressive strength of 60 MPa. Maximum aggregate size used was 8 and 20mm, and steel fiber volume fraction was 0, 0.5, 1, 1.5, 2% in volume basis, in this study. Flexural properties studied include first-crack strength, flexural strength and toughness index of hardened SFRC. For this purposes, three prisms ($100{\times}100{\times}400mm$) form each mixture were made and tested under four points bending on the span length 300 mm. Test results indicated that flexural strength and toughness of SFRC were improved with increasing the volume fraction. Especially, specimens with aggregate size of 8mm were reported higher improvement in flexural toughness index than those with 20mm. This phenomenon are remarkable that fiber dispersion is improved with smaller aggregate size. Also the optimum volume fraction of SFRC was presented for that with 1.5% volume fraction. Based on test results and available literatures, flexural strength prediction model was established from compressive strength, volume fraction and aspect ratio of steel fiber. The model existed a good correlation between measured data.
정책유형별 확산 메커니즘의 차별적 영향력에 관한 실증 연구
장석준 ( Seok Jun Jang ) 한국정책학회 2013 韓國政策學會報 Vol.22 No.4
본 연구는 확산 논의의 일반화를 위해 정책 유형별로 정책 확산 메커니즘이 상이하게작동할 것이라는 연구 가설을 제시하고 이에 대한 실증 검증을 시도하였다. 구체적으로 기초 자치단체 수준에서 수집된 5개 조례를 현저성과 복잡성에 따른 곰리의 정책 유형으로 분류하고 각각 조례의 확산 과정에서 확산 메커니즘의 영향력의 차이를 사건사 방법론을 통해 비교?분석하였다. 분석 결과, 정책의 현저성과 복잡성의 결합 정도에 따라 확산메커니즘의 영향력이 상이하다는 점을 확인하였다. 먼저, 정책의 확산 과정에서 TypeⅠ(높은 현저성 & 낮은 복잡성) 사례에서는 정당성에 근거한 모방 메커니즘이, TypeⅡ(낮은 현저성 & 높은 복잡성) 사례에서는 합리성에 근거한 수평적/수직적 학습 메커니즘 이 상대적으로 큰 영향을 주는 것으로 나타났다. 또한 TypeⅣ(높은 현저성 & 높은 복잡성)사례에서는 중앙정부 개입과 지방정부의 입법 전문성과 같은 정치?환경적 맥락의 결합 조건에 따라 합리성과 정당성에 근거한 확산 메커니즘이 동시적으로 영향을 미칠 수 있음을 발견하였다. 한편, TypeⅢ(낮은 현저성 & 낮은 복잡성) 사례에서는 확산 메커니즘의 영향력이 미미한 것으로 나타나고 있다. 이와 같은 연구 결과는 정책 확산 이론과 정책 유형론을 연계시킴으로써 정책 확산 논의의 일반화 가능성을 높이고 확산 이론의 확장을 가져왔다는 점에서 의의가 있다. The purpose of this study is to examine the differential influence of diffusion mechanism by policy typology. According to the Gormley’s typology, I assume that the degree of combination between salience and complexity determine the relative influence of the diffusion mechanism. This study uses data about five ordinance which obtained by South Korean subnational governments to test research hypotheses. The findings support this assumption. First, Type Ⅰ case(high salience and low complexity) is mainly affected by imitation mechanism based on legitimacy. Meanwhile, Type Ⅱ case(low salience and high complexity) is determined by learning mechanism based on rationality. In case of Type Ⅲ(high salience and high complexity), the influence of diffusion mechanism is contemporaneous and determined by the conditional combination between central government and local government’s characteristics such as legislative professionalism. These results imply that policy typology considerably affects adoption of innovative policy and diffusion mechanism.
골재크기 및 섬유혼입률에 따른 강섬유 보강 콘크리트의 휨 성능
장석준(Jang, Seok-Joon),안경림(Ahn, Kyung-Lim),윤현도(Yun, Hyun-Do) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.2
This paper describes the effect of aggregate size and fiber volume fraction on flexural properties of steel fiber reinforced concrete(SFRC) with specified compressive strength of 60 MPa. Maximum aggregate size used was 8 and 20mm, and steel fiber volume fraction was 0, 0.5, 1, 1.5, 2% in volume basis, in this study. Flexural properties studied include first-crack strength, flexural strength and toughness index of hardened SFRC. For this purposes, three prisms (100×100×400 mm) form each mixture were made and tested under four points bending on the span length 300 mm. Test results indicated that flexural strength and toughness of SFRC were improved with increasing the volume fraction. Especially, specimens with aggregate size of 8mm were reported higher improvement in flexural toughness index than those with 20mm. This phenomenon are remarkable that fiber dispersion is improved with smaller aggregate size. Also the optimum volume fraction of SFRC was presented for that with 1.5% volume fraction. Based on test results and available literatures, flexural strength prediction model was established from compressive strength, volume fraction and aspect ratio of steel fiber. The model existed a good correlation between measured data.
댄스스포츠 참여정도유형과 동기요인 및 지속요인과의 관계
장석준(Jang, Suk-Joon),이제홍(Lee, Jae-Hong) 한국사회체육학회 2017 한국사회체육학회지 Vol.0 No.68
The purpose of the study is to examine the relationship between participation patterns, motives and adherence in dance sport. A total of 355 adults who participated in dance sport in C and A cities were surveyed and finally selected for data analyses. Participation patterns and their relationship with motives were analyzed with use of frequency, correlation and multiple regression analyses. All the statistical analyses were performed using, SPSS 21.0. The results are as follows. First, as adults more often participate in dance sports, they demonstrated high levels of internal and external motivation. Second, duration and frequency were positively associated with the adherence; whereas, frequency was correlated with the sub-factors of adherence (i.e., strengthening and possibility). Third, tendency and strengthening had positive effects on the internal and external motivation while possibility had effects only on the external motivation. As the external motivation was more likely to influence on the adherence than internal motivation, adults should be provided with externally motivating environments. There is a need for further studies that aim to investigate various other motivational factors and their relationships with exercise adherence.