• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2012년 춘계학술대회
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• pp.579-583
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• 2012

The Design of Experiment (DOE) is a most practical technique when establishing an optimal condition for production technology in Six Sigma innovation project. This research proposes the assessment of properties of error terms, such as normality, equal variance, unbiasedness and independence. The properties of six nonparametric ranking techniques for checking normality assumption are discussed as well as run test which is used to identify the randomness, and to check unbiased assumption. Furthermore, Durbin-Watson (DW) statistics and ARIMA (p,d,q) process are discussed to identify the serial correlation.

• 대한기계학회논문집A
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• 제34권5호
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• pp.611-617
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• 2010

터빈 블레이드와 같은 시스템의 피로수명은 형상 설계변수의 변화에 따라 비선형적으로 복잡하게 나타난다. 방대한 계산시간이 요구되는 이러한 시스템의 CAE 기반 파라메트릭 설계최적화 문제에 근사기법인 크리깅 메타모델 방법이 활용되고 있다. 본 연구에서는 터빈 블레이드의 피로수명을 향상시키기 위하여, 설계변수 변화에 따른 피로수명의 비선형성을 고려함은 물론 직교성과 균형성을 모두 만족하는 다 수준 전산 실험계획법을 수행하여 크리깅 메타모델을 구축하였다. 크리깅 메타모델로부터 만족도 함수를 적용하여 피로 수명을 최적화하였고, 몬테카를로 모의실험법을 적용한 식스시그마 최적설계를 수행하여 피로수명의 결함률을 향상시킨 최적해의 강건성을 확보하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.157-162
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• 2003

An experimental investigation was conducted to study the behavior of high-strength RC wide beam-column joints with slab subjected to reversed cyclic loads under constant axial load. Six half scale interior wide beam-column assemblies representing a portion of a frame subjected to simulated seismic loading were tested, including three specimens without slab and three specimens with slab. The primary variables were compressive strength of concrete($f_ck$=285, 460kgf/$cm^2$), the ratio of the column-to-beam flexural capacity($M_r$=$\Sigma M_c / \Sigma M_b$ ; 0.77 -2.26), extended length of the column concrete($l_d$ ; 0, 12.5, 30cm), ratio of the column-to-beam width(b/H ; 1.54, 1.67). Test results are shown that (1) the behavior of specimen using high-strength concrete satisfied for required minimum ductile capacity according to increase the compressive strength, (2) the current design code and practice for interior joints(type 2) are apply to the wide beam-high strength concrete column.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2010년도 추계학술대회
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• pp.539-550
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• 2010

The study presents the application strategy and understanding of regression analysis with GLM(Generalized Linear Model) unifying with other statistical techniques such as correlation analysis and design of experiment(DOE). The quidelines proposed in this paper can be used for practioners to implement GLM and ANOVA(Analysis of Variance) for the DMAIC 5 steps of six sigma breakthrough.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.882-886
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• 2004

A nation have the regulation for a vehicle safety and interested in the side impact of a vehicle. But we spend a lot of money and time for the side impact test. So we must design a vehicle parts regard to the side impact test. This paper describes a new test method for side impact test. We used DFSS(Design For Six Sigma) process for design of door trim armrest. We searched the door trim armrest control factor and made the experiment plan. We researched the optimal design factor and improved the abdomen injury value of the human dummy.

• 한국자동차공학회논문집
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• 제20권5호
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• pp.145-151
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• 2012

New design of catalytic converter is proposed by optimization of DFSS (Design For Six Sigma) and DOE (Design Of Experiment) method which is based on taguchi matrix. As a result of the optimization of design of catalytic converter, this paper classifies Exhaust-downpipe shapes with 3 parameters to increase flow velocity uniformity of front catalytic substrate face from CFD results. after finishing with L9 Taguchi test matrix, it can be found the main effect of each design parameter of concept model, and optimal design level. in conclusion, it can be increase flow uniformity from 0.60 upto 0.80 with optimal diffuser shape for Turbo-charger.

• 품질경영학회지
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• 제39권1호
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• pp.131-140
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• 2011

Today, due to the global recession car sales have been decreased rapidly and auto makers are competing continuously to expand their market share. Automakers are struggling in order to secure competitive cost and quality through continuous cost reduction and quality innovation activities to win in the competition. In this situation, auto parts makers are trying to reinforce price competitiveness by reducing COPQ (Cost Of Poor Quality) in the mass production stages by securing the quality of components in advance from the design stage through DFSS (Design For Six Sigma) activities which is 6 sigma approach in the R&D field. However, auto parts makers have been undergone various confusion, feeling difficulties to get interrelationship among various activities. Thus, this study is going to suggest approach method for much more effective R&D activities by securing interrelationship between ISO/TS 16949 system established in the auto parts industry and DFSS activities.

• 한국건설관리학회논문집
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• 제11권6호
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• pp.89-99
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• 2010

군 내무생활관, 독신자 숙소 등은 동일한 평면이 반복되면서 대량으로 건설되는 대표적인 공공건축물이다. 이들 건축물들은 향후 군 구조개편시 부대의 이동, 재편에 따라 건축물의 해체 및 재사용 등이 요구되는 경우도 있다. 이러한 이유로 2005년 이래 군 건축물에 대해 철골조 기반의 공업화 건축공법인 모듈러 공법의 도입이 이루어져 왔다. 군 건축물에 모듈러 공법을 적용함에 있어 가장 중요한 요소는 표준화를 통한 공사비 절감, 건축물의 해체 및 재사용의 용이성 등이나 기존의 모듈러 군시설들은 이러한 요구를 만족시키지 못하였다. 본 연구는 향후 많은 수요가 예측되며 표준화된 모델을 적용하기 용이한 군독신자 숙소를 대상으로 식스-시그마 방법론을 이용한 모듈러 건축 시스템을 제안한다. 식스-시그마방법론을 적용하면 개발 단계에서 고객 요구사항을 주요 설계요소인 CTQ에 반영할 수 있고 이를 기반으로 설계 컨셉의 도출이 가능하다. 분석 결과 공사비 절감은 면적당 골조 중량, 재사용 용이성은 공장제작 비율의 지표로 나타낼 수 있음을 확인하였다. 본 연구에서 제안된 BOQ시스템은 기존의 모듈러 시스템에 비해 공장제작비율은 약 80% 향상되고, 면적당 골조의 중량은 기존 모듈러 시스템에 비해 62% 절감되어 충분한 경쟁력을 가지고 있는 것으로 평가되었다.

• 자동차안전학회지
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• 제6권1호
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• pp.5-9
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• 2014

Over the past ten years, since the introduction of the side crash test regulation in Europe, much research work has been performed internationally to develop new and modified test procedures to improve the level of occupant protection offered by vehicles in side crash test. This research has been co-ordinated and finally contributed to development of an AE-MDB(Advanced European Moving Deformable Barrier) and WorldSID (Worldwide Side Impact Dummy). EuroNCAP(European New Car Assessment Program) has the plan to conduct AE-MDB side crash test using WorldSID from 2015 by replacing Progressive MDB and EuroSID II. Automobile manufacturers need to respond to these changes closely. This paper is to find dominant control factor and analyze it of WorldSID 50%ile dummy injury through AE-MDB side crash test by predicting best and worst condition. And control factors will be validated within EuroNCAP regulations. This paper is analyzed by DFSS(Design for six sigma) which contains 5 control factors and is evaluated by ANOVA with the data as a result of LS-DYNA analysis correlated with crash pulse from 50 kph AE-MDB side crash test using WorldSID 50%ile dummy.

• 한국정밀공학회지
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• 제24권9호
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• pp.103-109
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• 2007

LCD (Liquid Crystal Display) is widely used electronic product. It needs too many processes such as PECVD (Plasma Enhanced Vapor Deposition), Sputtering, Photo-lithography, Dry etch. Each process is important but inspection process is more important because most companies emphasis on the six sigma. Recently, LCD inspection system is composed with inlet, inspector, outlet air pads. LCD is inspected on air pad which is shooting air from air hole. This paper studies on pad design of air bearing for LCD inspection to minimize LCD fluctuation. This design is able to reduce fluctuation and then satisfies CCD inspectional range. Also inspection pad needs to adequate stable area.