• Title/Summary/Keyword: width variable

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Contact problem for a stringer plate weakened by a periodic system of variable width slots

  • Mir-Salim-zada, Minavar V.
    • Structural Engineering and Mechanics
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    • v.62 no.6
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    • pp.719-724
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    • 2017
  • We consider an elastic isotropic plate reinforced by stringers and weakened by a periodic system of rectilinear slots of variable width. The variable width of the slots is comparable with elastic deformations. We study the case when the slots faces get in contact at some area. Determination of parameters characterizing the partial closure of variable width slots is reduced to the solution of a singular integral equation. The action of the stringers is replaced with unknown equivalent concentrated forces at the points of their connection with the plate. The contact stresses and contact zone sizes are found from the solution of the singular integral equation.

Comparative Study of Sasang Constitutions Diagnostic Accuracy Rate on Measurement Method of Body Shape by IBS-2000 Compensator (IBS-2000보정기기를 이용한 체형측정방법에 따른 사상체질 진단정확률 비교연구)

  • Sul, Yu-Kyung;Lee, Eui-Ju;Kim, Kyu-Kon;Kim, Jong-Won
    • Journal of Sasang Constitutional Medicine
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    • v.19 no.1
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    • pp.78-89
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    • 2007
  • 1. Objectives This is the comparative study with hand-operated measurement method & Automatic measurement method, in order to convert the automatic measurement method. 2. Methods We measured the body of patients(hand-operated width 5 places and hand-operated circumference 8 places, Automatic width 5 places) and analyzed the anthropometric data dividing into sex, age, BMI. 1057 patients's data are used in the analysis. 3. Results and Conclusions 1) 5th Width variable which was measured during lying down was not a sasang constitutional difference. 2) Diagnostic accuracy rate of the body measurement by Width which was measured during lying down and Width which IBS standing was 40-60%. 3) Diagnostic accuracy rate of Automatic & hand-operated measuring was not a big difference.

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Numerical Experiments of the Behavior of Bars in the Channels with Periodic Variable Width (주기적인 하폭 변화 수로에서 사주의 거동에 관한 수치실험)

  • Jang, Chang-Lae
    • Journal of Korea Water Resources Association
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    • v.47 no.1
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    • pp.37-47
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    • 2014
  • This study examines the processes and the behaviour characteristics of forcing bars in channels with periodic variable width in the alternate and braided regimes by using a two dimensional numerical model. The wavelength and the migration speed decrease as the amplitude of variable width increases. The forcing effects of the width variation on the alternate bars is stronger than those on the braided bars. The bar migration speed increases as the dimensionless amplitude in the braided regime is 0.25. However, the migration speed is abruptly decreased as the amplitude in it was larger than 0.25. The bar migration speed increases in the alternates bar regime as the dimensionless wavelength increases. However, the migration speed decreases around 1 of the wavelength. As the bar wavelength and the variable width wavelength coincide, the bars don't migrate downstream by the strong forcing effects on the bars due to the suppression by the width variation.

Stress Intensity Factors of Combined Mode(Mode I/II) Crack in a Variable Thickness Plate (두께가 변화하는 부재 내의 혼합모드(모드 I/II) 균열의 응력확대계수)

  • 조명래;양원호;최용식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.8
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    • pp.1875-1882
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    • 1993
  • Variable thickness plates are commonly used as structural members in the majority of industrial sectors. Previous fracture mechanics researches on variable thickness plates were limited to mode I loading cases. In practice, however, cracks are usually located inclined to the loading direction. In this respect, combined mode(mode I/II) stress intensity factors $K_{I}$ and $K_{II}$ at the crack tip for a variable thickness plate were obtained by 3-dimensional finite element analysis. Variable thickness plates containing a slant edge crack were chosen. The parameters used in this study were dimensionless crack $length{\lambda}$, slant $angle{\alpha}$, thickness $ratio{\beta}$ and width ratio{\omega}$. Stress intensity factors were calculated by crack opening displacement(COD) and crack sliding displacement(CSD)method proposed by Ingraffea and Manu.

Free Vibration Analysis of Horizontally Curved Beams with Variable Cross Sectional Width on Elastic Foundation (탄성지반 위에 놓인 단면폭이 변화하는 수평 곡선보의 자유진동 해석)

  • 이병구;박광규;오상진;이태은
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.10a
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    • pp.29-36
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    • 2003
  • This paper deals with the free vibration analysis of horizontally circular mea beams with variable cross sectional width on elastic foundations. Taking into account the effects of rotatory inertia and shear deformation differential equations governing the free vibrations of such beams are derived, in which the Whlkler foundation model is considered as the elastic foundation. The variable width of beam is chosen as the linear equation. The differential equations are solved numerically to calculate natural frequencies. In numerical examples, the curved beam with the hinged-hinged, hinged-clamped, clamped-hinged and damped-clamped end constraints are considered The parametric studies are conducted and the lowest four frequency parameters are reported in figures as the non-dimensional forms.

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Effects of Address Electrode Width on Address Discharge Under Variable Ambient Temperature in AC-PDP

  • Jang, Soo-Kwan;Tae, Heung-Sik;Jung, Eun-Young;Ahn, Jung-Chull;Yoo, Min-Sun
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.412-415
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    • 2008
  • It is known that the address discharge delay time during an address period strongly depends on the wall charge leakage. It was observed that the wall charge leakage during an address period is related to both the address width and the ambient temperature. Accordingly, the effects of address electrode width on the address discharge and wall voltage variation during an address period were examined under variable temperatures.

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A Study on the Estimation of the Fatigue Life Using the Stress Generated Models in the Steel Railroad Bridges (강철도교의 응력발생모형을 이용한 피로수명 추정에 관한 연구)

  • Yong, Hwan Sun;Kim, Seok Tae;Lee, Seong Soo
    • Journal of Korean Society of Steel Construction
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    • v.8 no.4 s.29
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    • pp.19-29
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    • 1996
  • In this paper, it is presumed that the stress time history was generated by simulation method and investigated compatibility in regard to the reappearance of stress time history. In this procedure, the identified frequency distribution of stress range of the steel railroad bridge varies with the rational values of cut off point and bar width. Thus, we show variable aspect of the equivalent stress range results from change of cut off point and bar width. In addition, we analyze the variable of RMC and RMS model due to the cut off point and bar width of the measured stress history which influencs the prediction of fatigue life in the steel railroad bridge. The simulated stress time history is carried out by the superposition method incorporating the vertical load with rotation moment obtained from the Hermition interpolation function, and compared with developing stress results from measured maxi mum stress. Through this study, we can estimate the remaining fatigue life from a safety point of view and comparative accuracy.

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Research on the Variable-Width and Double-Pulse Generator (가변폭 Double-Pulse Generator에 관한 연구)

  • 이병선
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.7 no.4
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    • pp.6-13
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    • 1970
  • The variable-width and double-pulse generator Here described is completely transistorized so its size is small and it is convenient to handle. The frequency ran be varied from 1 KHz to 500KHz, the pulse width from 0.4$\mu$sec to 8$\mu$sec, amplitude from 1V to 10V, and interval of double pulse from 0$\mu$sec to 12$\mu$sec. Positive and negative signal or double pulse trains can he obtained. An analysis has been carried out for each stage and the design equations are derived. The experimental results are compared with the analysis.

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Diagnosis Accuracy Rate Comparative Study of Each Sasang Constitutions and Sex Distinction by Body Measurement Method between 3D Body Measuring Instrument and Hand-operating (3D체형측정기와 수동측정 방법간의 사상체질별 ${\cdot}$ 성별 진단정확률 비교연구)

  • Kwon, Suk-Dong;Sul, Yu-Kyung;Lee, Eui-Ju;Kim, Kyu-Kon;Kim, Jong-Won
    • Journal of Sasang Constitutional Medicine
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    • v.19 no.1
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    • pp.60-77
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    • 2007
  • 1. Objectives This is the comparative study with hand-operated measurement method and Automatic measurement method, in order to convert the automatic measurement method. 2. Methods We measured the body of patients(hand-operated Width 5 Places and hand-operated circumference 8 place,Automatic Width 5 and automatic circumference 8 place by 3D body measuring instrument) and analyzed the anthropometric data divding into sex&age. 362 patient's data are used in the analysis. 3. Results and Conclusions 1) 1th circumference variable which standing was not a sasang constitutional difference. 2) Diagnostic accuracy rate of the body measurement was 50-80%. 3) Diagnostic accuracy rate of man is higher than Diagnostic accuracy rate of women 4) Diagnostic accuracy rate of Automatic & hand-operated measuring was not a big difference.

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