• 제목/요약/키워드: Axial Data

검색결과 1,059건 처리시간 0.024초

New Family of the Exponential Distributions for Modeling Skewed Semicircular Data

  • Kim, Hyoung-Moon
    • 응용통계연구
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    • 제22권1호
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    • pp.205-220
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    • 2009
  • For modeling skewed semicircular data, we derive new family of the exponential distributions. We extend it to the l-axial exponential distribution by a transformation for modeling any arc of arbitrary length. It is straightforward to generate samples from the f-axial exponential distribution. Asymptotic result reveals two things. The first is that linear exponential distribution can be used to approximate the l-axial exponential distribution. The second is that the l-axial exponential distribution has the asymptotic memoryless property though it doesn't have strict memoryless property. Some trigonometric moments are also derived in closed forms. Maximum likelihood estimation is adopted to estimate model parameters. Some hypotheses tests and confidence intervals are also developed. The Kolmogorov-Smirnov test is adopted for goodness of fit test of the l-axial exponential distribution. We finally obtain a bivariate version of two kinds of the l-axial exponential distributions.

신뢰성 이론을 이용한 고강도콘크리트 구조물의 축력-모멘트관계에 있어서의 해석방법에 대한 평가 (The Estimation of Analytical Method for Axial Force-Moment Relationships of High-Strength Concrete Structures using Reliability Theory)

  • 최광진;장일영;송재호;홍원기
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1998년도 봄 학술발표회논문집(II)
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    • pp.447-454
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    • 1998
  • The main object of the study is that axial force-moment relationships for high strength concrete structures using reliability theory(Linear statstical method, Monte Carlo Simulation) including probability conception. And mean stress factors and centroid factors proposed to high strength concrete structures using reliability theory(Linear statstical method, Monte Carlo Simulation). Finally, The established experimental data for axial force-moment relationships are compared to the analytical data(data for Linear statstical method and Monte Carlo Simulation) for axial force-moment relationships in this analytical method.

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냉각탑용 축류팬 형상 정밀도 측정 시스템 (Surface Profile Measuring System for Axial Fan of Cooling Towers)

  • 강재관;이광일
    • 한국정밀공학회지
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    • 제22권4호
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    • pp.151-158
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    • 2005
  • An important component of a cooling tower is an axial fan, and there happens distortion in its shape which brings significant loss of efficiency. In this paper, a surface profile measuring system for large size axial fan of cooling towers is developed. A laser sensor is used as a measuring device and aluminum profiles and stepping motors are engaged into the system as frame structure and driving devices respectively. The measuring data are compared to the design data to compute the distortion of the axial fans. Two types of errors, axial and twist errors, are used to represent the precision of axial fan distortion. Genetic algorithm is used to solve the optimization problem during computing the precision. Results are displayed three dimensionally in a solid-modeler as well as 2-D drawings to help users find it with ease.

A New Family of Semicircular Models: The Semicircular Laplace Distributions

  • Ahn, Byoung-Jin;Kim, Hyoung-Moon
    • Communications for Statistical Applications and Methods
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    • 제15권5호
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    • pp.775-781
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    • 2008
  • It is developed that a family of the semicircular Laplace distributions for modeling semicircular data by simple projection method. Mathematically it is simple to simulate observations from a semicircular Laplace distribution. We extend it to the l-axial Laplace distribution by a simple transformation for modeling any arc of arbitrary length. Similarly we develop the l-axial log-Laplace distribution based on the log-Laplace distribution. A bivariate version of l-axial Laplace distribution is also developed.

신뢰성이론을 이용한 고강도콘크리트 구조물의 축력-모멘트관계에 관한 해석적인 연구 (The Analytical Study of Axial Force-Moment Relationships for High Strength Concrete Structures using Reliability Theory)

  • 최광진;홍원기;장일영;송재호
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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    • pp.500-506
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    • 1997
  • The main object of the study is that axial force-moment relationships for high strength concrete structures using reliability theory probability conception. And mean stress factors and centroid factors proposed to high strength concrete structures using reliability theory. Finally, the established experimental data for axial force-moment relationships are compared to the analytical data for the axial force-moment relationships in this analytical method.

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A Projected Exponential Family for Modeling Semicircular Data

  • Kim, Hyoung-Moon
    • 응용통계연구
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    • 제23권6호
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    • pp.1125-1145
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    • 2010
  • For modeling(skewed) semicircular data, we derive a new exponential family of distributions. We extend it to the l-axial exponential family of distributions by a projection for modeling any arc of arbitrary length. It is straightforward to generate samples from the l-axial exponential family of distributions. Asymptotic result reveals that the linear exponential family of distributions can be used to approximate the l-axial exponential family of distributions. Some trigonometric moments are also derived in closed forms. The maximum likelihood estimation is adopted to estimate model parameters. Some hypotheses tests and confidence intervals are also developed. The Kolmogorov-Smirnov test is adopted for a goodness of t test of the l-axial exponential family of distributions. Samples of orientations are used to demonstrate the proposed model.

국내도로 주행 시험을 통한 6축 진동시험 방법에 관한 연구 (Multi-axial Vibration Test on MAST System with Field Data)

  • 김찬중;배철용;이봉현;권성진;나병철
    • 한국소음진동공학회논문집
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    • 제16권7호
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    • pp.704-711
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    • 2006
  • Vibration test on MAST(multi axial simulation table) system has several advantage over one-axial vibration test that could simulate 6-DOF, 3-axial translation and 3-axial moment, at the same time. Since field vibration motion can be fully represented with 6-DOF, multi-axial vibration test on vehicle component is widely conducted in technical leading companies to make sure its fatigue performance in vibration environment. On the way to fulfill the process, editing technique of obtained field data is key issue to success a reliable vibration testing with MAST system. Since the original signals are not only too large to fulfill it directly, but all of the measured data is not guarantee its convergency on generating its driving files, editing technique of the original signals are highly required to make some events that should meet the equal fatigue damage on the target component In this paper, key technique on editing a field data feasible for MAST system is described based on energy method in vibration fatigue. To explain its technique explicitly, author first introduced a process on field data acquisition of two vehicle component and then, representing events are produced to keep up with the editing strategy about a energy method. In the final chapter, a time information regarding a vibration test on MAST system is derived from the energy data which is critical information to perform a vibration test.

수치해석을 이용한 흙막이벽체의 사보강버팀보에 적용하는 축강성에 대한 현장 적용성 연구 (A Study on the Field Application to Axial Stiffness Applying Corner Strut of Retainingwall Using Numerical Analysis)

  • 이영진;이성규;이강일
    • 한국지반신소재학회논문집
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    • 제21권2호
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    • pp.39-48
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    • 2022
  • 사보강버팀보는 수평버팀보와 달리 토압이 발생할 경우 설치각에 의한 휨거동이 발생하기 때문에 버팀보의 축강성만이 요구되는 탄소성해석으로는 그 적용에 대한 한계가 존재한다. 따라서, 본 연구에서는 탄소성해석시의 사보강버팀보에 대한 해석방안을 제시하기 위하여 축강성데이터를 수정하는 방안으로의 접근을 시도하였으며, 이를 위하여 선형탄성해석을 이용하였다. 그리고, 선형탄성해석을 통하여 실제현장에 설치된 사보강버팀보에 대한 축강성데이터를 산정하였다. 산정한 사보강버팀보의 축강성데이터는 탄소성해석에 적용하여 흙막이벽체의 거동을 확인하였으며, 이를 계측결과 및 유한요소해석결과와 비교하여 그 적용성을 평가하였다. 연구 결과 선형탄성해석을 이용하여 사보강버팀보의 축강성데이터를 적용한 경우(Case 1, Case 3)는 버팀보의 축강성을 적용하는 일반적인 방법(Case 2, Case 4)에 비하여 축강성데이터는 9~17% 수준으로 감소하였으며, 탄소성 해석시의 흙막이벽체의 변위는 25.33%~64.42%로 증가하였다. 이 결과를 계측결과와 비교한바 선형탄성해석을 활용한 경우(Case 1, Case 3)는 탄소성해석시의 흙막이벽체 거동을 더욱 잘 나타내었다.

Projected Circular and l-Axial Skew-Normal Distributions

  • Seo, Han-Son;Shin, Jong-Kyun;Kim, Hyoung-Moon
    • 응용통계연구
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    • 제22권4호
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    • pp.879-891
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    • 2009
  • We developed the projected l-axial skew-normal(LASN) family of distributions for I-axial data. The LASN family of distributions contains the semicircular skew-normal(SCSN) and the circular skew-normal(CSN) families of distributions as special cases. The LASN densities are similar to the wrapped skew-normal densities for the small values of the scale parameter. However CSN densities have more heavy tails than those of the wrapped skew-normal densities on the circle. Furthermore the CSN densities have two modes as the scale parameter increases. The LASN distribution has very convenient mathematical features. We extend the LASN family of distributions to a bivariate case.