• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1990년도 가을 학술발표회 논문집
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• pp.117-122
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• 1990

This is the study on the feature of workability and engineering properties of flowing concrete using the superplasticizing agents which is using to effect considerable reductions in water contents in the same level of consistemcy and workability. It is the aim of this study to compare workabili쇼 and engineering properties of flowing concrete according to the addition time and method of superplasticizing agents. In this experimental study, 2cm slump of concrete, 18cm slump of conventional concrete, two kinds of aggregates and addition time and method of superplasticizing agents of 0, 15, 30, 45, 60 and 90 minutes were included to analyze and investigate the workability and engineering properties of flowing concrete.

• 센서학회지
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• 제14권2호
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• pp.91-95
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• 2005

A fiber Fabry-Perot interferometric sensor for the measurement of current flowing into a small fuse have been studied. The proposed current sensor was fabricated with a fiber Fabry-Perot interferometer attached close to a fuse line inside a small fuse. The fiber Fabry-Perot interferometer used in the experiment had the 10 mm cavity length and the 3.5 % reflectance mirrors. The phase shift of the output signal of the current sensor was proportional to the square of current applied to the fuse and the sensitivity of the current sensor was 0.87 degree/$mA^{2}$. The experiment results show that this sensor can be used for measuring current flowing into the fuse.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2001년도 학술논문발표회
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• pp.28-33
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• 2001

This paper presents the results of mock up test on the manufacturing of high fluidity concrete by applying flowing methods with segregation reducing type superplasticizer(SRS). Three kinds of mock up structure are made such as. conventional concrete(A), high fluidity concrete(B) and high fluidity concrete incorporating 20% of fly ash(C). Physical and mechanical properties, temperature history of structure and nondestructive test are performed. Segregation reducing type superplasticizer is put into base concrete at field, and base concrete is also flowed at field. C mock up structure which requires 0.85% of SRS to flow base concrete shows most desirable performance at fresh state. The highest rising temperature shows the lowest at C structure among the tested structures. Strength variations before and after flowing also show the lowest values at C structures.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2001년도 학술논문발표회
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• pp.157-162
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• 2001

Recently, lots of studies for high flowing concrete have been suggested under practical use that it is only a way to solve the confronted problem. However, most studies have been concentrated on the manufacture method and properties of fresh concrete, but there is few studies for the durability of hardened concrete, specially for the freezing and thawing. Therefore this study is to investigate for the resistance of high-flowing concrete using finely ground granulated furnace blast slag to frost with experimental parameters, such as binder, ratio of replacement of granulated furnace blast slag, superplasticizer, curing method and blain surface area of granulated furnace blast slag.

• Journal of Advanced Marine Engineering and Technology
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• 제18권4호
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• pp.43-52
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• 1994

I investigated experomentally the spray characteristics to the operating conditions and the shapes of internal mixing twin fluid atomizer. The wide variations of air per liquid ratio are conducted to predit the influences of the Sauter mean diameter(SMD), spray angle, distribution of drop size, the flowing condition of gas and length, flowing, area of gas and liquid, and diameter, number and place of the orifice. In this experiment, air per liquid raio, mixing chamber length per diameter, orifice diameter, and the flowing area ratio of gas and fluid influences greatly on SMD, spray angle, distribution of drop size and intermittent fluctuation region.

• 한국정밀공학회지
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• 제16권11호
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• pp.16-21
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• 1999

Recently, the rheology on the fluidity of materials has been progressed remarkably. Viscosity measurement for precision-accuracy has needed very important to measure the rheological properties of materials in the field of chemistry-fiber, paint, printing-ink, plastics, rubber, foodstuff-industry, etc. And many methods of measurement have been developed lately. So in this experimental study, small capacity torque transducer with type of strain gage, different method against other existing viscometers, measured viscosity about a liquid that has flowing characteristics of newtonian liquid. Using the assumed computational equation of viscosity, it has same value of viscosity in each different radius of rotating cylinder. In the result, this equipment will be used in the viscosity measurement of a liquid taking flowing characteristics of newtonian liquid.

• 한국멀티미디어학회논문지
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• 제11권6호
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• pp.729-736
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• 2008

Using video synthesis to depict flowing water is useful in virtual reality, computer games, digital movies and scientific computing. This paper presents a novel algorithm for synthesizing dynamic water scenes through a sample video based on a dynamic texture model. In the paper, we treat the video sample as a 2-D texture image. In order to obtain textons, we analyze the video sample automatically based on dynamic texture model. Then, we utilize a linear dynamic system (LDS) to describe the characteristics of each texton. Using these textons, we synthesize a new video for dynamic flowing water which is prolonged and non-fuzzy in vision. Compared with other classical methods, our method was tested to demonstrate the effectiveness and efficiency with several video samples.

• 한국구조물진단유지관리공학회 논문집
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• 제16권6호
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• pp.63-72
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• 2012

고유동 콘크리트는 일반 콘크리트에 비해 고가의 각종 혼화재료를 과량 혹은 추가로 사용하여야 하기 때문에 재료비 단가 상승, 추가 설비의 필요 등의 문제점이 있고, 재료분리를 방지하기 위해 분체량을 증가시킴으로써 과잉 강도발현 등 고유동 콘크리트가 갖고 있는 많은 장점이 있음에도 특수 목적이외에는 그 사용에 있어 제약이 있었다. 이에 본 연구에서는 기존에 개발된 고강도성 고유동 콘크리트와 달리 일반 강도의 고유동 콘크리트의 상용화를 위해 콘크리트 구성 재료 중에서 골재를 중심으로 이들의 합리적 활용과 콘크리트의 성능향상 모색을 위해 정량적 인자별 실험을 수행하였다. 사용한 실험변수로 물-시멘트비, 잔골재율, 골재의 조립률, 입자 크기의 중요도, 13mm 골재와 미립분의 활용에 대해 검토하였으며, 슬럼프플로와 U형 충전시험의 충전고차로 평가하였다. 연구결과, 고유동 콘크리트 성상은 굵은 골재보다 잔골재 입도에 대한 의존도가 높으며, 잔골재율이 높을수록, 조립률이 낮을수록 충전성과 유동성 확보에 유리하였다. 또한, 골재의 대체재로써 13mm 골재 및 미립의 석분을 활용함으로써 보다 효율적으로 충전성과 유동성을 향상시킬 수 있음이 본 연구를 통해 확인되었다.

• 대한토목학회논문집
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• 제29권2A호
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• pp.163-169
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• 2009

본 연구에서는 3수준의 강도 변화에 따른 고유동 자기충전 콘크리트를 제조하여 콘크리트의 유변학적 특성 및 역학적 특성 평가하기 위하여 석회석 미분말, 플라이애시 및 고로슬래그를 2성분계 및 3성분계 배합으로 제조된 콘크리트의 유동 및 강도 실험을 실시하였다. 실험 결과 30 MPa급의 고유동 자기충전 콘크리트는 품질확보, 강도 및 점성 조절용으로 석회석 미분말 20% 및 플라이애시 30% 배합이 요구성능을 만족하였으며, 50 MPa급의 고유동 자기충전 콘크리트는 고로슬래그 미분말 10% 및 플라이애시 20%를 사용한 배합이 소요의 유동 및 강도 특성을 만족하였다. 또한 분체량이 많은 70 MPa급의 경우 유동성 향상 및 점성 감소용으로 고로슬래그 20% 및 플라이애시 10% 배합이 요구성능을 만족하였으며, 모든 배합에서 플라이애시의 사용이 점성확보 및 시멘트 절감효과를 위하여 사용 될 수 있을 것으로 판단된다. 이상의 실험 결과를 통하여 압축 강도수준별 고유동 자기충전 콘크리트는 2성분계 배합의 경우 보다 플라이애시를 포합한 3성분계 배합이 적합한 것으로 판단된다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1999년도 봄 학술발표회 논문집
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• pp.300-304
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• 1999

A study is strength analysis of a filtering structure for a viscoelastic flowing substance. Conventional segment type filter units comprise an assembly of two or more individual disc segments stacked at their respective hubs on a central common filtrate collection tube within a filter housing. The conventional type's leaf disc is problem that it don't support a high pressure flows. Therefore, this study develope new structure filtering model to stand a high pressure flows.