• Title/Summary/Keyword: Correlative Equation

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The Retained Activity Level of the Community Dwelling Healthy Group and Stroke Group Aged More Than 55 years: A Preliminary Study (지역사회에 거주하는 55세 이상의 건강한 집단과 뇌졸중 집단의 활동보유수준: 예비 연구)

  • Lee, Sang-Heon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.11
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    • pp.5337-5344
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    • 2012
  • The purpose of this study was to investigate retained activity and level for community dwelling healthy and stroke group aged more than 55 years, and to identify group difference for following research. Korean-Activity Card Sort was used to collect research data. The equation for calculating retained activity level was used. Descriptive statistical analysis was used to analyze retained activity level in elderly. Spearman Correlation Coefficients applied to analyze the relation between demographic data and retained level of activities. Mutiple Linear Regression was used to analyze the variables affecting retained activity level. The ratained level of activity, the healthy group perform, was decreased on the stroke group. And statistically significant correlative and affecting variables was different between demographic data and retained activity of individual groups. The results of this research, retained level of activities and group differences, can provide the basic data to provide health care services to adapt or replace activity participation of healthy and stroke group aged more than 55 years.

Derivation of predicting regression equations of bonding thickness and deflection of glass edge considering the interaction effects between the parameters (공정변수간의 교호작용을 고려한 모서리 접합두께 및 처짐량 예측 회귀식 도출)

  • Kim, Youngshin;Jeon, Euysik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.2
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    • pp.511-516
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    • 2013
  • The thickness and deflection of melting parts of the glass edge reach the biggest effect on the intensity and thermal insulation performance. During the sealing process using a hydrogen mixed gas torch, the thickness and the deflection effect of the edge part are affected by process parameters. In order to analyze the correlative relationship of the thickness prediction and the deflection of the edge part according to the process parameters, data was obtained by conducting sealing experiments. The main effects and interaction effects of process parameters for the thickness and the shape of the glass edge parts were analyzed through the design of experiment. A mathematical experiment equation that can predict the thickness and deflection of the edge part according to the process parameters was developed by conducting multiple regression equations.

Determination of Deformation Modulus of Rock Mass with Measured Tunnel Displacement (측정된 터널변위에 의한 암반 변형계수의 결정)

  • Park, Jae-Woo;Park, Eun-Gyu;Kim, Gyo-Won
    • The Journal of Engineering Geology
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    • v.17 no.4
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    • pp.655-664
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    • 2007
  • The major geotechnical parameters employed in tunnel design are deformation modulus, Poisson's ratio, friction angle, cohesion, etc. Among these parameters, the deformation modulus is the most significant parameter in tunnel deformation. However, determination of the modulus for rock mass by means of tests is very difficult due to factors affecting including discontinuities and sample size, etc. Thus input values used in the numerical analysis are generally determined by empirical method. A numerical analysis on tunnel was conducted with geotechnical parameters determined through the geological field mapping, laboratory tests, and evaluation of boring data, and some discrepancy between the computed result and tunnel displacements measured was found. Thus, further analyses by changing the deformation modulus of rock mass were performed to determine a relationship between the modulus and computed displacement. Data from two tunnel sites were used to verify the applicability of the proposed method and a correlative equation between deformation modulus and tunnel displacement is proposed. The deformation modulus of rock mass was around 30-40% of young's modulus of intact rock in these cases.

Correlation and Regression on Growth Factors of Phyllostachys bambusoides Sieb. et Zucc. in Tamyang District (담양지방(潭陽地方)의 왕(王)대나무에 있어서의 성장인자간(成長因子間)의 상관(相關) 및 회귀(回歸))

  • Lee, Kwang-Nam
    • Journal of Korean Society of Forest Science
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    • v.13 no.1
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    • pp.79-84
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    • 1971
  • This study is, by correlation and regression analysis, on the correlation between culm height and other growth factors which are circle at eye height and length of internode. The samples were come by in Tamyang district, To sum up, the results are as follows; 1. Two growth factors are much more correlative to culm height; both simple correlation and multiple correlation between the former and the latter are significant. ($r_{yx}=0.91$, $r_{yz}=0.78$, $r_{yx{\cdot}z}=0.84$, $r_{yz{\cdot}x}=0.55$, $R_{y{\cdot}xz}=0.94$) Seeing above significance, circle at eye height is more highly correlative than length of internode. 2. The following regression equation was derived from regression analysis. y= -0.687+0.335x+0.206z. y ; culm height. x ; circle at eye height. z ; length of internode. 3. By testing of the equation, regression coefficients are as follows; ${\beta}{\neq}O$, ${\gamma}{\neq}O$, ${\beta}{\neq}O{\neq}{\gamma}$ 4. The results tested the precision of the empirical formula, standard error of standard error by percentage are as follows. $Sy{\cdot}xz=0.89$, $Sy{\cdot}xz(%)=8.14$.

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