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Pre-mix 시멘트를 사용한 초고강도 콘크리트의 간이 단열 온도 발현에 관한 연구
오성옥 ( Oh Seong Ok ),이한승 ( Lee Han Seung ),김우재 ( Kim Woo Jae ),김유진 ( Kim You Jin ),이재삼 ( Lee Jae Sam ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
Recently, the ultra high-strength concrete of 100MPa~150MPa has been used on construction site by high-rise building above the story of 100. Currently 60MPa~l00MPa temperature hysteresis analysis of the concrete it came to accomplish, but 100MPa the analysisthe above accomplished and support it was not. The concrete 27MPa~150MPa until it will do an insulation temperature rise test from the research. It will examine a FEM adiabatic temperature analysis and at temperature characteristic of ultra high-strength concrete.
수화반응 모델을 이용한 2성분계 콘크리트의 단열온도상승 예측에 관한 연구
오성옥(Oh Seong-Ok),왕소용(Wang Xiao-Yong),이한승(Lee Han-Seung) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.11
Granulated slag and fly ash, silica fume are among the industrial by-products and have been widely used as mineral admixture in high performance concrete and high strength concrete. Due to the reaction between calcium hydroxide and fly ash or slag, compared with Portland cement, the hydration of concrete containing fly ash or slag, silica fume is much more complex. In this paper, it is considered that hydration products, Ca(OH)₂ is consumed with pozzolan reaction of mineral admixtures. A numerical model is proposed to simulate the hydration of concrete containing fly ash or slag, silica fume. The heat release rate of fly ash or slag, silica fume blended concrete is determined from the contribution of both cement hydration and reaction of mineral admixtures. Furthermore, a temperature rise in blended concrete is evaluated based on the degree of hydration of cement and mineral admixtures. The proposed model is verified with experimental data on the concrete with different water-to-binder ratios and mineral admixtures substitution ratios.
핸드볼 슈팅 특성에 따른 골키퍼 방어율 분석: 2019 여자 핸드볼 세계선수권 대회 자료를 중심으로
이승훈(Seung-hun Lee),김언호(Eonho Kim),오성옥(Seong-ok Oh) 한국체육측정평가학회 2021 한국체육측정평가학회지 Vol.23 No.3
본 연구의 목적은 시간의 흐름, 슈팅 유형 등의 환경적 요소를 고려하여 승패로 구분된 집단 간 핸드볼 골키퍼 방어율에 영향을 미치는 요인을 살펴보는데 있다. 2019년 일본에서 열린 여자핸드볼세계선수권대회 91경기에 출전한 전체 골키퍼를 대상으로 승패집단에 따른 슈팅 시간, 슈팅 유형별 골키퍼의 방어율 차이검증을 위해 반복측정 이원배치 분산분석을 이용하였다. 승패집단 간 골키퍼 방어율의 차이는 시간의 흐름에 영향을 받았는데, 특히, 경쟁요소가 극대화되는 전반전 종반부(승리팀: 26.9%, 패배팀: 18.9%)와 후반전 종반부(승리팀: 31%, 패배팀: 17%)에서 가장 큰 차이를 나타냈다. 반면, 승패집단 간 골키퍼 방어율의 차이는 슈팅 유형에 영향을 받지 않았으며, 7m(13.8%), 속공(15.3%), 돌파(15.3%) 슈팅에서의 방어율에 비해 6m(24.4%), 9m(29.6%), 윙슛(29.9%)에서의 방어율이 상대적으로 높게 나타났다. 본 연구의 결과는 골키퍼 방어율의 환경적 요소와 패턴에 기초해 훈련의 초점을 시간과 위치에 맞춰 설정할 필요성을 밝혀냈으며, 향후 진행될 유사연구에서는 자료의 범위를 넓히고, 골키퍼 방어율에 영향을 미칠 수 있는 다양한 변수 간 상관성에 기반 한 분석이 이루어져야 한다고 사료된다. The purpose of this study is to identify factors that affect the intergroup handball goalkeeper"s defensive ratio, which is divided into wins and losses, taking into account the flow of time, environmental factors of the type of shooting. goalkeeper’s who played in 91 games except for five draws at the 2019 Women"s Handball World Championships in Japan, the team used a 2-way ANOVA of repeat measurements to verify the difference in the goalkeeper"s defensive ratio by type of shooting. The difference in goalkeeper defensive ratio between winning and losing groups was influenced by the passage of time, especially at the end of the first half (26.9% for winning team, 18.9% for losing team) and the end of the second half (31% for winning team, 17% for losing team). In addition, the difference in goalkeeper defensive ratio between winning and losing groups was not affected by the type of shooting, with relatively higher defensive ratio in 6m shots (24.4%), 9m shots (29.6%), and wingshots (29.9%) compared to 7m shots(13.8%), fast break (15.3%), Breakthroughs (15.3%). Based on the environmental factors and patterns of goalkeeper defensive ratio, the need to focus training on time and location, and similar studies in the future should broaden the scope of data and analyze correlations among various variables that can affect goalkeeper defensive ratio.