• Title, Summary, Keyword: 분산분석(ANOVA)

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Temperature analysis of each coolant level in turning by a multiple comparison (다중비교를 이용한 선삭가공시 절삭유량에 따른 온도변화분석)

  • 박태준;양승한;이영문;김희술
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1033-1036
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    • 2001
  • The object of this paper is to find out a coolant level, which is economic and similar to the conventional level, high level, in cutting temperature. For this, new coolant level, called a low level, was proposed, which is about 1/4 of conventional level. And the cutting temperature of each coolant level in turning was analyzed using statistical method. Firstly, it was analyzed that the temperature mean of each coolant level is not equal by ANOVA-test. Secondly by Tukey's HSD, one of multiple comparisons, it was analyzed that the temperature mean of low level is similar to that of high level and different from that of none level.

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Stochastic Approach to Experimental Analysis of Cylindrical Lapping Process (통계적 접근법에 의한 원통 래핑 공정의 실험 분석)

  • 최민석;김정두
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.10
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    • pp.2509-2517
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    • 1993
  • Lapping is a very complicated and random process resulting from the variation of abrasive grains in its sizes and shapes and from the numerous factors having an effect on the process quality. Thus it needs to be analyzed by experimental method rather than by theoretical method to obtain the relative effects of factors quantitatively. In this study, cylindrical lapping experiment designed by Taguchi's L8 orthogonal array was performed and analyzed by Yates' ANOVA table. As a result, effective factors and interaction effects were identified and discussed. Also the optimal factor combination to obtain the largest improvement of surface roughness was selected and confirmatory experiments were peformed.

A Study on Performance Improvement of Diaphgram for Micro Speaker using Table of Orthogonal Array (직교배열표를 이용한 마이크로 스피커용 다이아프램의 성능개선에 관한 연구)

  • 홍도관;우병철;안찬우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.162-165
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    • 2004
  • On this study, we improved diaphgram for micro speaker performance using Taguchi method in discrete design space. The design of diaphgram has an effect on performance of micro speaker such as, thickness of diaphgram, shape of diaphgram, etc. Therefore this study carried to decide shape of diaphgram and thickness of diaphgram for minimizing 2nd natural frequency of diaphgram using Taguchi method. we showed improved design factors that minimized 2nd natural frequency of diaphgram. Also, 2nd natural frequency of diaphgram for micro speaker is reduced up to 37 percent maintaining twist mode shape. From the results of ANOVA, 2nd natural frequency of diaphgram for micro speaker have an effect on position of the outer curved shape and thickness of diaphgram.

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A Study on the Improving Diaphgram for Micro Speaker Performance using Taguchi Method (다구찌법을 이용한 마이크로 스피커용 다이아프램의 성능개선에 관한 연구)

  • Hong, D.K.;Woo, B.C.;Ahn, C.H.
    • Proceedings of the KSME Conference
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    • pp.534-538
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    • 2004
  • On this study, we improved diaphgram for micro speaker performance using Taguchi method in discrete design space. The design of diaphgram has an effect on performance of micro speaker such as, thickness of diaphgram, shape of diaphgram, etc. Therefore this study carried to decide shape of diaphgram and thickness of diaphgram for minimizing 2nd natural frequency of diaphgram using Taguchi method. we showed improved design factors that minimized 2nd natural frequency of diaphgram. Also, 2nd natural frequency of diaphgram for micro speaker is reduced up to 37 percent maintaining twist mode shape. From the results of ANOVA, 2nd natural frequency of diaphgram for micro speaker have an effect on position of the outer curved shape and thickness of diaphgram.

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Analysis and Optimization of Geometric Error in Surface Grinding using Taguchi Method (다구찌기법에 의한 연삭가공물의 형상오차 분석 및 최적화)

  • Chi, Long-Zhu;Hwang, Yung-Mo;Yoon, Moon-Chul;Ryoo, In-Il;Ha, Man-Kyung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.3 no.4
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    • pp.13-19
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    • 2004
  • This paper deals with the analysis of geometric error and the optimization of process parameters in surface grinding. Taguchi method which is one of the design of experiments has been introduced in achieving the aims. The process parameters were the grain size, the wheel speed, the depth of cut and the table speed. The effect of the process parameters on the geometric error was examined and an optimal set of the parameters was selected to minimize the geometric error within the controllable range of the used grinding machine. The reliability of the results was evaluated by the ANOVA.

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Analysis of the Effects of Cutting Force and Surface Roughness in the Cutting Conditions of Plasma Source Ion Implantation Tools (플라즈마 이온주입 공구의 가공조건이 절삭력과 표면 거칠기에 미치는 영향 분석)

  • Kang, Seong-Ki
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.21 no.5
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    • pp.755-760
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    • 2012
  • In this study, three dimensional cutting force components and surface roughness appeared in high speed cutting by using tungsten carbide endmill tools implanted ion or not found mutual relations through several analysis of statistical dispersion. It is showed that cutting force(Fx) is affect with spindle speed and feed rate, cutting force(Fy) is affect with spindle speed and ion implantation time and cutting force(Fz) is affect with feed rate in interaction through the statistical method of ANOVA of cutting force and surface roughness, it is analyzed that it is affected of spindle speed and feed rate in surface roughness.

An empirical study of Chinese consumers' lifestyle by country of origin effect of mobile phone (중국소비자 조사에서 휴대폰의 원산국 효과에 따른 라이프스타일 실증 연구)

  • Kim, Seong-Ju
    • Journal of the Korean Data and Information Science Society
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    • v.27 no.6
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    • pp.1565-1571
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    • 2016
  • This paper is an empirical study of chinese consumers' lifestyle by country of origin effect of mobile phone. The data we analyze in this paper was collected and studied in Kim et al. (2006, 2007). We classify the respondents into the four groups according to the responses of country of origin effect of mobile phone. The four groups are group K (preference in made in Korea), group J (preference in made in Japan), group U (preference in made in USA), and group C (preference in made in China). One-way ANOVA and stepwise discriminant analysis are applied to classify the training sample which consists of 89 lifestyle variables and two personnel information. It is observed that group K is more open-minded, out front, aggressive, and self-assertive compared to group C.

Thermal Performance Evaluation of Design Parameters and Development of Load Prediction Equations of Office Buildings (사무소 건설의 설계변수 열성능 평가 및 부하예측방정식 개발)

  • 석호태;김광우
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.9
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    • pp.914-921
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    • 2001
  • The objective of this study is to evaluate the design parameters and to develop the cooling and heating load prediction equations of office buildings. The building load calculation simulation was carried out using the DOE-2.1E program. The results of the simulation was used as a data for ANOVA and multiple regression analysis which could develop the load prediction equations.

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Job Design for Safety by Sensibility Based on the Oriental Human Constitution (동양 체질론의 감성적 기질을 이용한 안전 직무설계)

  • 최성운;이영석
    • Proceedings of the Safety Management and Science Conference
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    • pp.31-39
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    • 1999
  • 감성과학은 인간의 감성을 정성하고, 더 정량적으로 측정 평가하고 이를 제품이나 환경설계에 응용하여 보다 편리하고 안락하며, 안전하게 나아가 인간의 삶을 쾌적하게 하고자 하는 기술이다. 본 연구에서는 사상 체질론, 오행 체질론, 바이오리듬의 감성적 요소를 감성과학의 관점에서 고찰하고, 각 기질이나 상태별로 반응시간 측정기로 반응시간을 측정하고, 반응시간의 차이를 분산분석(ANOVA)을 이용 비교ㆍ분석하여 객관적으로 평가하고, 직무설계에 이용하고자 한다.

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A Comparative Study on the Police Department Size and Job Satisfaction, Turnover Intention (경찰관서 규모와 직무만족, 이직의도 비교 연구)

  • Sin, Seong-Won
    • Proceedings of the Korea Contents Association Conference
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    • pp.241-242
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    • 2014
  • 이 연구에서는 경찰의 조직적 특성 중 경찰관서의 규모에 따른 직무만족과 이직의도 수준을 비교 분석하고자 하였다. 경찰관서 규모에 따른 직무만족과 이직의도 수준의 차이를 살펴보기 위해 독립변수는 관서규모와 급지, 종속변수는 직무만족과 이직의도로 구성하여 일원변량 분산분석(One-way ANOVA)을 실시하였다. 그 결과 관서규모와 급지 둘 다 직무만족과 이직의도에서 통계적으로 유의한 수준의 차이가 발견되었다.

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