• Title/Summary/Keyword: 실험계획법

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Application of Experimental Design Methods for Minimum Weight Design and Sensitivity Evaluation of Passive-Type Deck Support Frame for Offshore Plant Float-Over Installation (해양플랜트 플로트오버 설치 공법용 수동형 갑판 지지 프레임의 최소중량설계와 민감도 평가를 위한 실험계획법 응용)

  • Kim, Hun Gwan;Lee, Kangsu;Song, Chang Yong
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.1
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    • pp.161-171
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    • 2021
  • This paper presents the findings of a comparative study on minimum weight design and sensitivity evaluation using different experimental design methods for the structural design of an active-type deck support frame (DSF) developed for the float-over installation of an of shore plant topside. The thickness sizing variables of the structural members of a passive-type DSF were considered the design factors, and the output responses were defined using the weight and strength performances. The design of the experimental methods applied in the comparative study of the minimum weight design and the sensitivity evaluation were the orthogonal array design, Box- Behnken design, and Latin hypercube design. A response surface method was generated for each design of the experiment to evaluate the approximation performance of the design space exploration according to the experimental design, and the accuracy characteristics of the approximation were reviewed. Regarding the minimum weight design, the design results, such as numerical costs and weight minimization, of the experimental design for the best design case, were evaluated. The Box- Behnken design method showed the optimum design results for the structural design of the passive-type DSF.

Probe Pitch에 따른 Si 식각 특성 연구

  • Han, Seok-Man;Sin, Jae-Cheol;Go, Hang-Ju;Han, Myeong-Su
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.08a
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    • pp.316-316
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    • 2012
  • 본 연구에서는 Si wafer에 마스크 공정 및 Slit-etching 공정을 적용하여 25 um 피치의 probe unit을 개발하기 위해 Deep Si Etching 장비를 이용하여 식각공정 조건에 따른 특성을 평가하였다. 25 um pitch는 etch 폭의 크기에 따라 3종류로 설계하였으며, 식각공정은 2수준, 4인자 실험계획법에 의해 8회 실험을 수행하였다. 실험계획법에 의해 미니탭을 활용하여 최적조건을 구한 결과 12.5 um etch 폭에서는 가스유량은 200 sccm, 에칭시간 7 sec, 코일 파워 1500W, 에칭 압력은 43.7 mtorr의 조건이 etch 형태 및 profile angle이 목표치에 근접한 결과를 얻었다. 또한 probe pitch를 30~60 um까지 증가시켰을 경우 Etch depth는 증가하였으며, 식각율 또한 증가한 현상을 보였다. 재현성 실험을 위해 위의 최적조건을 이용하여 2회 반복하여 실험한 경우 모든 시편이 목표치에 도달하였다. 이는 미세피치화 되는 프로브 유닛의 기초데이터로 활용될 수 있다.

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Local Influence Approach Diagnostics for Optimal Experimental Design (최적 실험계획법에 대한 Local Influence Approach 진단방법)

  • 김영일
    • The Korean Journal of Applied Statistics
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    • v.4 no.2
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    • pp.195-207
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    • 1991
  • We consider the development of simple regression-like diagnostics for assessing the sensitivity of an optimal design to deviations from the assumptions of constant error variance. This contains a review of Cook's local influence approach and an application of local influence aproach to D-optimal experimental design. The method is applied in a number of simple examples in Section 3. Conclusions and directions for further research follow in Section 4.

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System Reliability Analysis for Nonnormal Distributions and Optimization Using Experimental Design Technique (실험계획법을 이용한 비정규 분포에 대한 신뢰도 계산 방법과 최적 설계에의 적용)

  • Seo, Hyun-Seok;Chang, Jin-Ho;Kwak, Byung-Man
    • Proceedings of the KSME Conference
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    • 2001.06c
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    • pp.327-332
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    • 2001
  • An experimental design technique is developed for estimating the moments of system response functions. It is easy to implement and provides accurate results compared with other traditional methods. It is based on the work of Taguchi, later improved by D'Errico and Zaino. The existing experimental techniques, however, is applicable only for normally distributed cases. In this article the three-level Taguchi method is extended to obtain optimum choice for levels and weights to handle nonnormal distributions. A systematic procedure for reliability analysis is then proposed by using the Pearson system and the narrow system reliability bounds. Illustrative examples including a tolerance optimization problem are shown very accurate comparing with those by Monte-Carlo simulations and the first-order reliability method.

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Grinding Characteristics of Ceramic using the Experimental Plan Method (실험계획법을 이용한 세라믹재료의 연삭특성)

  • 정을섭;김성청;소의열;이근상
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.938-942
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    • 2002
  • This paper has studied to obtain the grinding characteristics and optimal grinding renditions of ceramic materials in the grinding with diamond wheel by the experimental plan method. The load on wheel by varying the feed rate was related with the surface roughness due to the minute destruction phenomenon of grains for the Si$_3$${N^4} and Zr{O_2}$. The depth of cut is related with the surface roughness because the grinding is carried out by grain shedding process due to the brittle fracture phenomenon for the ${Al_2}{O_3}$. The major factors affecting the surface roughness and the optimum grinding conditions were obtained with minimum experiments using the experimental plan method.

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