• Title/Summary/Keyword: ANOVA Analysis

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Analysis of Cutting Edge Geometry Effect on Surface Roughness in Ball-end Milling Using the Taguchi Method (다구찌 방법을 통한 볼 엔드밀 절삭날 형상이 가공면 거칠기에 미치는 영향 분석)

  • Cho, Chul Yong;Ryu, Shi Hyoung
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.23 no.6
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    • pp.569-575
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    • 2014
  • In this study, the effect of cutting edge geometry, such as helix and rake angles, on surface roughness in ball-end milling is investigated by using the Taguchi method. A set of experiments adopting the $L_{27}(3^{13})$ design with an orthogonal array are conducted with special WC ball-end mills having different helix and rake angles. Analysis of variance (ANOVA) is performed to analyze the effects of tool geometry and machining parameters, such as cutting speed, feed per tooth, and depth of cut, on surface roughness. The ANOVA results reveal that helix and rake angles are critical factors affecting surface roughness; the interaction of helix angle and cutting speed is also important. This research can contribute to novel cutting edge designs of ball-end mills and optimization of cutting parameters.

Multi-Objective Optimization Using Kriging Model and Data Mining

  • Jeong, Shin-Kyu;Obayashi, Shigeru
    • International Journal of Aeronautical and Space Sciences
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    • v.7 no.1
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    • pp.1-12
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    • 2006
  • In this study, a surrogate model is applied to multi-objective aerodynamic optimization design. For the balanced exploration and exploitation, each objective function is converted into the Expected Improvement (EI) and this value is used as fitness value in the multi-objective optimization instead of the objective function itself. Among the non-dominated solutions about EIs, additional sample points for the update of the Kriging model are selected. The present method was applied to a transonic airfoil design. Design results showed the validity of the present method. In order to obtain the information about design space, two data mining techniques are applied to design results: Analysis of Variance (ANOVA) and the Self-Organizing Map (SOM).

An Effect of Load and Genders on Postural Stability (취급자재의 무게와 성별이 균형 능력에 미치는 영향)

  • Yang, Byoung-Hak
    • Journal of the Korea Safety Management & Science
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    • v.12 no.3
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    • pp.101-106
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    • 2010
  • The purposes of this paper are to investigate an effect of weight of material and gender on postural stability and to introduce formulas for those. There were five levels of weights 0, 9, 18, 27 and 36 kg, and two levels of genders were conducted. Eight male and five female subjects participated in this experiment, ten tests were performed for each level of weights to measure the postural stability by using the stability platform. The effect of the genders and the load on the postural stability were statistically analysed by the two way ANOVA test and the regression analysis. The ANOVA test showed that the effect of weights was statistically significant on postural stability to the both male and female subjects. And the postural stability of female subjects was better than that of male subjects. A linear regression formula for the balancing time and the load and a formula for the reduction rate postural stability and the relative load were introduced by the regression analysis.

Mother-Infant Interactions in Social Games (사회적 게임에서의 영아-어머니 상호작용)

  • Lee, Mi Ran;Lee, Young
    • Korean Journal of Child Studies
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    • v.21 no.3
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    • pp.25-40
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    • 2000
  • This study investigated the development of infant behaviors and maternal scaffolding in mother-infant games. Subjects were 60 mothers and their 9-, 12-, 15- and 18-month infants, 15 dyads in each age group. Mother-infant interaction was videotaped in the laboratory as they played peek-a-boo and a ball game in 2 sessions. Infant game behaviors were classified by the Rome-Flanders, Cossette, Ricard and $D{\acute{e}}carie$(1995) list, and maternal game behaviors were classified by the Hodapp, Goldfield & Boyatzis(1984) list. Data were analyzed by one-way ANOVA, two-way ANOVA with repeated measures, sequential analysis and Z test as well as qualitative analysis. Results showed that infants played an increasingly active role with age. Infants mastered the ball game at earlier age than peek-a-boo. Mothers scaffolded infant behaviors in various ways. The amount of maternal game behavior varied by type of game.

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One-way ANOVA Analysis to Verify the Effect of Hybrid Strength Estimators by Number of Measurements (일원분석을 통한 하이브리드 추정계의 측정횟수별 영향검증)

  • Han, Soo-Hwan;Hu, Yun-Yao;Kim, Su-Ho;Lim, Gun-Su;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.04a
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    • pp.37-38
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    • 2022
  • This study is attempted to propose an appropriate number of measurements by checking and statistically analyzing the change in hardness according to the number of measurements. As a result, there was no significant difference between the 20th and 30th data, and in the 10th case, the effect on errors occurring during measurement was found to be dominant. Therefore, as the number of measurements, proposing 20 times in consideration of the convenience of use. In addition, in order to minimize the effect on the measurement error, it is proposed to remeasure the surface mane of the measurement surface and the test value in which the error occurs on the average of the test values.

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Bata Base Development for Blue Jean Marketing Strategy(Part I) - targeting young adult's buying patterns and preferred designs in fall 1997- (진의류 마케팅 전략을 위한 데이타 베이스 구축에 관한 연구(제1보) -1997년 추계 신세대 진바지 소비자들의 구매행동과 구매된 디자인 유형을 중심으로-)

  • Kim, Chil-Sun;Lee, Hun-Ja;Sim, Gyu-Hye
    • Journal of the Korean Society of Clothing and Textiles
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    • v.22 no.1
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    • pp.159-169
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    • 1998
  • The purpose of this study was to develop a large representative data base of market information for jeans apparel. This study was to observe consumer buying behavior and to determine the market share of various brands depending on several variables such as age and distribution regions. This study also analyzed the major factors in purchasing jeans for 17-29 age groups. The 660 questionnaires were distributed and 618 reliable ones were used for statistical analysis. A SAS statistical package including frequency' table, Chi-square test, factor analysis, analysis of variance(ANOVA), Duncan's multiple range test was used. The results of this study showed that consumer possessed about 6 pairs of jeans and bought about 3 pairs of jeans per year. The most recently purchased brand was Nix. Lots of brands were statistically significant at the segmented three age groups and in the five different distribution regions. The most popular type of design was the basic style. The result of factor analysis indicated 4 factors(quality/comfort, famous brand/fashion, mood/extrinsic attitude, economy). The result of ANOVA represented that three factors among them have influenced on the preferred design types.

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Type I Analysis by Projections (사영에 의한 제1종 분석)

  • Choi, Jae-Sung
    • The Korean Journal of Applied Statistics
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    • v.24 no.2
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    • pp.373-381
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    • 2011
  • This paper discusses how to get the sums of squares due to treatment factors when Type I Analysis is used by projections for the analysis of data under the assumption of a two-way ANOVA model. The suggested method does not need to calculate the residual sums of squares for the calculation of sums of squares. There-fore, the calculation is easier and faster than classical ANOVA methods. It also discusses how eigenvectors and eigenvalues of the projection matrices can be used to get the calculation of sums of squares. An example is given to illustrate the calculation procedure by projections for unbalanced data.

Brand Switching Motives of Blue Jean Consumers (청바지 소비자의 상표전환동기에 관한 연구)

  • Ha, You-Sun;Chung, Sung-Jee;Kim, Dong-Geon
    • Journal of the Korean Society of Clothing and Textiles
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    • v.33 no.10
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    • pp.1673-1682
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    • 2009
  • The purpose of the study was to investigate differences in: 1) importance of buying motives including external stimuli and sales promotional stimuli among groups according to levels of diversity orientation; 2) importance of buying motives including external stimuli and sales promotional stimuli among their subordinate factors. Questionnaires were distributed 340 women who aged between 20 and 30. A sample of 317 women responded to the questionnaire. Using SPSS/PC version 12.0, factor analysis reliability analysis, Analysis of Variance (ANOVA), and Repeated measure ANOVA were used for the data analysis. As results, there were significant differences in importance of buying motives including external stimuli and sales promotional stimuli among groups according to levels of diversity orientation. Also, there were significant differences in importance of external stimuli and sales promotional stimuli among their subordinate factors.