• Title/Summary/Keyword: GFS code

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A Study on the Strength Capacity and the Strengthening Effects of Steel Reinforced Concrete(SRC) Beams with Carbon Fiber Sheets (CFS) and Glass Fiber Sheets (GFS) (탄소섬유 및 유리섬유로 보강한 합성보의 내력산정과 보강효과에 대한연구)

  • 김희규;신영수;최완철;홍영균
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.565-570
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    • 1997
  • This study is on the strength capacity and the strengthening effects of crarbon fiber sheets(CFS) and glass fiber sheets (GFS) on steel reinforced concrete(SRC) beams. SRC beams are often used on high-rise building construction to save story height and construction cost. However, there are no strengthening design code in Korea and most engineers design it as steel beams ignored the composite effect if reinforced concrete. Test results on steel reinforced concrete beams reveal thar the strength capacity of SRC beam is more than simple addition of steel and reinforced concrete beams. In case of steel reinforced concrete beams, ultimate moment capacity of strengthening beam of carbon fiber sheets is 120% of non-strengthening one.

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Adaptable I/O System based I/O Reduction for Improving the Performance of HDFS

  • Park, Jung Kyu;Kim, Jaeho;Koo, Sungmin;Baek, Seungjae
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.16 no.6
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    • pp.880-888
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    • 2016
  • In this paper, we propose a new HDFS-AIO framework to enhance HDFS with Adaptive I/O System (ADIOS), which supports many different I/O methods and enables applications to select optimal I/O routines for a particular platform without source-code modification and re-compilation. First, we customize ADIOS into a chunk-based storage system so its API semantics can fit the requirement of HDFS easily; then, we utilize Java Native Interface (JNI) to bridge HDFS and the tailored ADIOS. We use different I/O patterns to compare HDFS-AIO and the original HDFS, and the experimental results show the design feasibility and benefits. We also examine the performance of HDFS-AIO using various I/O techniques. There have been many studies that use ADIOS, however our research is expected to help in expanding the function of HDFS.

Analysis of Unsteady Cavitating Flows in Fuel Injection Nozzle of Piezo-driven Injector by Eulerian-Lagrangian Multi-phase Method (Eulerian-Lagrangian 다상 유동해석법에 의한 피에조 인젝터의 노즐 내부 비정상 캐비테이션 유동해석)

  • Lee, Jin-Wook;Min, Kyung-Duk;Kang, Kern-Yong;Gavaises, M.;Arcoumanis, C.
    • Journal of ILASS-Korea
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    • v.9 no.4
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    • pp.38-45
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    • 2004
  • This study describes the analysis results of unsteady cavitating flows behavior inside nozzle of the prototype piezo-driven injector. This piezo-driven injector has been recognised as one of the next generation diesel injector due to a higher driven efficiency than the conventional solenoid-driven injector. The three dimensional geometry model along the central cross-section regarding of one injection hole has been used to simulate the cavitating flows for injection time by at fully transient simulation with cavitation model. The cavitation model incorporates many of the fundamental physical processes assumed to take place in cavitating flows. The simulations performed were both fully transient and 'pseudo' steady state, even if under steady state boundary conditions. We could analyze the effect the pressure drop to the sudden acceleration of fuel, which is due to the fastest response of needle, on the degree of cavitation existed in piezo-driven injector nozzle

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A Study on Relation of Needle-Nozzle Flow of Piezo-driven Injector by using Eulerian-Lagrangian Multi-phase Method (Eulerian-Lagrangian 다상 유동해석법에 의한 피에조인젝터의 니들-노즐유동 상관성 연구)

  • Lee, Jin-Wook;Min, Kyoung-Doug
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.5
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    • pp.108-114
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    • 2010
  • The injection nozzle of an electro-hydraulic injector is being opened and closed by movement of a injector's needle which is balanced by pressure at the nozzle seat and at the needle control chamber, at the opposite end of the needle. In this study, the effects of needle movement in a piezo-driven injector on unsteady cavitating flows behavior inside nozzle were investigated by cavitation numerical model based on the Eulerian-Lagrangian approach. Aimed at simulating the 3-D two-phase flow behavior, the three dimensional geometry model along the central cross-section regarding of one injection hole with real design data of a piezo-driven diesel injector has been used to simulate the cavitating flows for injection time by at fully transient simulation with cavitation model. The cavitation model incorporates many of the fundamental physical processes assumed to take place in cavitating flows. The simulations performed were both fully transient and 'pseudo' steady state, even if under steady state boundary conditions. As this research results, we found that it could analyze the effect the pressure drop to the sudden acceleration of fuel, which is due to the fastest response of needle, on the degree of cavitation existed in piezo-driven injector nozzle.