• 제목/요약/키워드: Parametric Study

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모빌리티법을 이용한 동하중을 받는 저널 베어링의 최적설계 (Optimum Design of Dynamically-Loaded Journal Bearings by Mobility Method)

  • 심현해;김창호;오박균;권오관
    • Tribology and Lubricants
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    • 제2권2호
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    • pp.32-43
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    • 1986
  • The mobility method is used for optimizing dynamically-loaded journal bearings. Connecting -rod bearings in both diesel and gasoline engines are optimized by parametric studies of bearing span and clearance. The inertia effect of the connecting-rod is also included in this study. Minimum film thickness, maximum film pressure, and friction loss are calculated to satisfy the design conditions in both engines.

영역조건평균에 기초한 난류연소속도의 직접수치해법검증 (Validation of an asymptotic zone conditional expression for turbulent burning velocity against DNS database)

  • 김수엽;허강열
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2004년도 제29회 KOSCI SYMPOSIUM 논문집
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    • pp.62-69
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    • 2004
  • Zone conditional formulations for the Reynolds average reaction progress variable are used to derive an asymptotic expression for turbulent burning velocity. New DNS runs are performed for validation in a statistically one dimensional steady state configuration. Parametric study is performed with respect to turbulent intensity, integral length scale, density ratio and laminar flame speed. Results show good agreement between DNS results and the asymptotic expression in terms of measured maximum flame surface density and estimated turbulent diffusivity in unburned gas.

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능동형 방음벽 개발을 위한 LMS 알고리즘군(群) 분석 (Evaluation of LMS Algorithms Family for Active Noise Control Barriers)

  • 차상곤;신은우
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.1493-1496
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    • 2011
  • Research results for LMS-based algorithms performances using real records of the traffic noise are discussed. The various algorithms based on LMS method are studied regarding their convergence speed and noise reduction index. Most effective algorithms are chosen for implementation in the active noise control barriers. The optimal step size, and number of adaptive filter taps are addressed during parametric study of the algorithms.

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3차원 좌표측정기(CMM)의 오차방정식 유도에 관한 연구 (A Study on the Volumetric Error Equation of Coordinate Measuring Machines and their Application)

  • 이응석
    • 대한기계학회논문집
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    • 제19권6호
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    • pp.1545-1553
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    • 1995
  • For general geometry of Coordinate Measuring Machine (CMM), volumetric error equation including 21 systematic error components was showed using vector expression. Different types of CMM listed on an international standard (BS 6808) were classified according to their geometry, and the general volumetric error equation was used for the CMMs. Application of volumetric error equation was also introduced, such as position error compensation, error equation of CNC-machine and parametric error analysis, etc.

상관관계의 존재하에서 붓스트랩 기법을 이용한 $\bar{x}$ 와 EWMA관리도의 수행도 평가 (Performance Evaluation of $\bar{x}$ and EWMA Control Charts using Bootstrap Technique in the Presence of Correlation)

  • 손한덕;송서일
    • 한국산업경영시스템학회:학술대회논문집
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    • 한국산업경영시스템학회 2002년도 춘계학술대회
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    • pp.365-370
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    • 2002
  • In this study, according to MARMA(1,0) model which was suggested by Seppala, in case of existing autocorrelation in X control chart and EWMA control chart, the standard method and the non-parametric bootstrap method were compared and analysed using the bootstrap method which use the resampling prediction residual.

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바닥하중 및 면내압축력을 받는 플렛 플에이트 슬래브 (Reinforced Concrete Flat plates Under Combined In-plane and Out-of-plane Loads)

  • 박홍근;김의회;홍성걸
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1998년도 가을 학술발표논문집(II)
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    • pp.424-429
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    • 1998
  • Numerical studies are performed to investigate the behavior of flat plates under combined in-plane and out-of-plane loads. The numerical model is verified by comparison with experiments for plates simply supported on four edges. Through study on different load combination and loading sequence, the critical load condition that governs the strength of the flat plate is determined. Parametric studies are performed to investigate the buckling coefficient and the effective flexural rigidity so that the moment magnification method is applicable to the flat plates.

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조합하중을 받는 해양구조물 원통부재의 최동강도 해석 (Utimate strength analysis of cylindrical members of offshore structure subject to combined loads)

  • 박치모
    • 한국해양공학회지
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    • 제11권2호
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    • pp.11-17
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    • 1997
  • Simple and efficient way of nonlinear analysis considering elasto-plastic large deformation is introduced to calculate the strength of ring-stiffened cylinears subject to combined load of axial compression and lateral pressure. Parametric study gives various collapse modes according to the combination ratio of axial compression and lateral pressure, interaction between axial compression and lateral pressure and imperfection sensitivity of ultimate strength.

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ENUMERATION OF LOOPLESS MAPS ON THE PROJECTIVE PLANE

  • Li, Zhaoxiang;Liu, Yanpei
    • Journal of applied mathematics & informatics
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    • 제10권1_2호
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    • pp.145-155
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    • 2002
  • In this paper we study the rooted loopless maps on the sphere and the projective plane with the valency of root-face and the number of edges as parameters. Explicit expression of enumerating function is obtained for such maps on the sphere and the projective plane. A parametric expression of the generating function is obtained for such maps on the projective plane, from which asymptotic evaluations are derived.