• Title, Summary, Keyword: radial gate

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Optimum Design of Radial Gate (회전식 수문의 최적 설계)

  • 권영두;권순범;박창규;윤영중
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.14 no.3
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    • pp.267-276
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    • 2001
  • On the basis of structural analysis of the radial gate(that is, Tainter gate), this paper focuses on the optimization of the moment distribution according to the location of the arm of the radial gate. In spite of its importance from economical view point, we could hardly find the study on the optimum design of radial gate. Accordingly, the present study identifies the optimum section modulus for a radial arm along with the optimum position for 2 of 3 radial arms with a convex cylindrical skin plate relative to a given radius of the skin plate curvature, pivot point, water depth, ice pressure, etc. These optimum measurements are then compared with previously constructed radial gates. The results indicate that the optimum section modulus vague for a radial arm was appreciably smaller than the previously constructed examples.

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Local zooming genetic algorithm and its application to radial gate support problems

  • Kwon, Young-Doo;Jin, Seung-Bo;Kim, Jae-Yong;Lee, Il-Hee
    • Structural Engineering and Mechanics
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    • v.17 no.5
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    • pp.611-626
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    • 2004
  • On the basis of a structural analysis of radial gate (i.e. Tainter gate), the current paper focuses on weight minimization according to the location of the arms on a radial gate. In spite of its economical significance, there are hardly any previous studies on the optimum design of radial gate. Accordingly, the present study identifies the optimum position of the support point for a radial gate that guarantees the minimum weight satisfying the strength constraint conditions. This study also identifies the optimum position for 2 or 3 radial arms with a convex cylindrical skin plate relative to a given radius of the skin plate curvature, pivot point, water depth, ice pressure, etc. These optimum designs are then compared with previously constructed radial gates. Local genetic and hybrid-type genetic algorithms are used as the optimum tools to reduce the computing time and enhance the accuracy. The results indicate that the weights of the optimized radial gates are appreciably lower than those of previously constructed gates.

Optimal Location of Support Point for Weight Minimization in Radial Gate of Dam Structures (회전식 수문의 중량 최소화에 대한 지지점 위치의 최적설계)

  • Kwon, Young-Doo;Kwon, Soon-Bum;Goo, Nam-Seo;Jin, Seung-Bo
    • Proceedings of the KSME Conference
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    • pp.492-497
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    • 2000
  • This paper focuses on the weight minimization of radial gate, as an extention of the previous work. Radial gates are commonly used to regulate the flow-rate of general purpose dams, due to its simplicity in manufacture and control. The present study identifies the optimum position of support point for 2 and 3 arm type radial gate, which guarantees the minimum weight satisfying strength constraint condition. These optimum designs are then compared with previously constructed radial gates. The results indicate that the weights of the optimized radial gates reduce by about 20%, compared to those of the conventionally designed radial gates.

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Discharge Coeficient Analysis according to Flow Condition for Radial Gate Type (Radial Gate 형식의 배수갑문 흐름조건별 유량계수 검토)

  • Park, Yeong-Wook;Hwang, Bo-Yeon;Song, Hyun-Gu
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.306-312
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    • 2005
  • Gates for the purpose of drainage are classified following the types of structure as: Radial Gate, Sluice Gate, Rolling Gate, Drum Gate. In many cases of the reclamation project the sluice type of gates are applied. Different from this general trend, however the radial type of gate was adopted in the Saemangeum project. In this case the discharge coefficients which are used for the sluice type of gate was applied. To estimate the correct amount of discharge which will be evacuated through the gates, therefore the proper discharge coefficients should be estimated before the operation of the gates. The discharge coefficients were estimated through the physical hydraulic modeling, and we got the results as: $0.72{\sim}0.84$ for the submerged condition on the both sides of upstream and downstream, $0.62{\sim}0.83$ for the free surface condition on the downtream side only, and $1.04{\sim}1.12$ for the free surface condition on the both sides of upstream and downstream. The discharge coefficients obtained from the experiments are greater than those of the sluice gates in the design criteria. From the results of the study we may expect that in the Saemangeum project the radial gates could evacuate larger amount of discharge than the originally designed discharge, so that we may sure that the Saemangeum gates have enough capability to control the evacuation of water not only in the usual period but also in the flooding season.

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Development of the Automatic Design System for Hydraulic Gate (취수 갑문 설계 자동화 개발)

  • Lee, Hoo-Gwang;Choi, Jae-Seung;Hwang, Suk-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.6
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    • pp.127-132
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    • 2001
  • An automatic design system for a hydraulic gate has been developed to cut down the time for the design calculation and to optimize its design. It is oriented to the radial gate which is the simplest, most reliable, least expensive and most widely used hydraulic gate. This system is composed of data input, strength computation and result display modules with databases of the properties of components and materials. In this development, the existing intricate design procedure has been changed to the straightforward procedure without assumption of weight. With this code, the design time of the radial gate could be reduced below one thirtieth in comparison with manual work and the optimum design could be accomplished easily.

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Study on Self- excited Vibration of Radial Gate in Estuary Sulices due to Bottom Shape by Hydraulic Model Tests (수리모형 실험에 의한 배수갑문 원호형 문비의 하부형상에 대한 진동현상 연구)

  • Lee Seong-haeng
    • KCID journal
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    • v.3 no.1
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    • pp.10-19
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    • 1996
  • A hydraulic model test was peformed for radial gate in estuary sulices to find out a proper bottom shape of gate which minimize the amplitudes of vibration. Firstly natural frequencies ore measured, and the results were compared with the numerical analysi

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A Gate Delay Model Considering Temporal Proximity of Multiple Input Switching (다중 입력 변화의 시간적 근접성을 고려한 게이트 지연 시간 모델)

  • Shin, Jang-Hyuk;Kim, Ju-Ho
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.2
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    • pp.32-39
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    • 2010
  • Conventional cell characterization does not consider Multiple Input Switching(MIS). Since the impact of MIS on gate delay variation is large, it is not possible to predict the accurate gate delay with the conventional cell characterization. We observed the maximum 46% difference in gate delay due tn MIS. In this paper, we propose a gate delay model considering the delay variation caused by the temporal proximity of MIS. The proposed model calculates the delay variation using the Radial Basis Function. The experimental results show that the proposed method can more accurately predict the gate delay when MIS occurs.

FIELD EMISSION FROM TRIODE FIELD EMITTER WITH PLANAR CARBON-NANOPARTICLE CATHODE

  • Park, Kyung-Ho;Seo, Woo-Jong;Lee, Soon-Il;Koh, Ken-Ha
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.309-312
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    • 2002
  • Triode field emitters with planar-carbon-nanopaticle (CNP) cathodes were successfully fabricated using the conventional photolithography and the hotfilament chemical vapor deposition. Electron emission from a CNP triode emitter with a 12-${\mu}m$-diameter gate hole started at the gate voltage of 45 V, and the anode current reached the level of ${\sim}120$ nA at the gate voltage of 60 V, respectively. For the quantitative analysis of the Fowler-Nordheim (F-N) type emission from a CNP triode emitter, we carried out 2dimensional numerical calculation of electrostatic potential using the finite element method. As it turned out, a radial variation of electric field was very important to account for the emission from a planar emitting layer. By assuming the graphitic work function of 5 eV for CNPs, we were able to extract a consistent set of F-N parameters, together with the radial position of emitting sites.

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A Study on the Displacement Analysis in the Injection Molding for the Plastic Lens (플라스틱 렌즈 사출에서의 변위 해석에 관한 연구)

  • Lee, Joo-Sang;Yoon, Sang-Jin;Kim, Chi-Kyoon
    • Journal of the Korean Society of Mechanical Technology
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    • v.19 no.4
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    • pp.567-572
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    • 2017
  • Smart phones are currently the most popular electronic devices with high volume production activities driven by high demand and requirements for rapid turnaround time. The changes of displacement were analyzed according to a variable of the gate size and runner system. The radial type and gate with large size were shown that better results in displacement. While the design and production of lenses, the key component of a camera, still need to be improved, the current technology has run into its limit with regard to trends in size and weight reduction. In this study, an injection molding analysis was performed on plastic lenses that are widely employed for smart phone cameras. Specifically, the displacement of lenses at the time of injection molding was studied by varying the gate size and runner system.