• 한국정보통신학회논문지
• /
• 제14권4호
• /
• pp.868-874
• /
• 2010

본 논문에서 식스 시그마 프로젝트의 관리를 위한 자동 결재 시스템의 설계를 제안하고자 한다. 제안하는 설계 시스템은 식스 시그마가 추구하는 혁신 및 개선 활동을 활성화하기 위해 전사적인(enterprise-wide) 개선 과제를 등록하고, 선정하고, 과제의 진도를 관리하고, 유효성을 검증하고, 그 이력을 관리하기 위한 목적을 가지고 있다. 각각의 개선 과제들은 데이터베이스에 저장되어, 정보 활용성을 높인다. 제안된 시스템은 국내의 모 기업에서 현재 효과적으로 사용되고 있으며, 이를 통해 체계적으로 식스 시그마 프로젝트의 진도를 관리하고 효율적인 업무 처리를 실현하는 효과를 기대할 수 있다.

• 품질경영학회지
• /
• 제40권3호
• /
• pp.316-326
• /
• 2012

Purpose: In this paper, a Design for Six Sigma(DFSS) methodology based on DMADV(Define-Measure-Analyze-Design-Verify) roadmap is presented. Methods: DFSS tools are given for each DMADV phase which is suitable for the aircraft development process. A cost reduction case study of a navigation simulation is demonstrated. Results: DFSS roadmap are presented with implementation tools for each phase. Conclusion: We propose a DFSS methodology which can benefit the design and development personnel to implement DFSS not only in aircraft industry but also in other order-based industries in general.

• 품질경영학회지
• /
• 제33권1호
• /
• pp.88-98
• /
• 2005

This paper considers a six sigma project for improving the TIP life time in a spot welding process. The project follows a disciplined process of five phases: define, measure, analyze, improve, and control. A process map is used to identify process input and output variables. Nine key process input variables are selected by using C&E matrix and FMEA, and finally four vital few input variables are selected from analyze phase. The optimum process conditions of the vital few input variables are jointly obtained by maximizing TIP life time using DOE and alternative selection method.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2010년도 춘계학술대회
• /
• pp.509-517
• /
• 2010

The paper proposes the misuse types of statistical quality tools according to the kind of data and the number of population in DMAIC process of six sigma. The result presented in this paper can be extended to the QC story 15 steps of QC circle. The study also provides the improvement methods about control chart, measurement system analysis, statistical difference, and practical equivalence.

• 한국품질경영학회:학술대회논문집
• /
• 한국품질경영학회 2006년도 춘계학술대회
• /
• pp.153-157
• /
• 2006

현장의 품질 관리방법으로 식스시그마 DMAIC(Define-Measure-Analysis-Improve-Control) Process는 설계 분야의 Design for Six Sigma Process인 DMADV (Define-Measure-Analysis-Design-Verify), ICOV (Identify-Characterize-Optimize-Verify) Process 로 문제를 설계 단계에서 사전에 해결하는 How to do 의 방법, Process 로 확대되어 많은 기업으로 확대되고 있다. 또한 최근 신상품, 신사업 기획이 중요해지면서 What to do 에 해당하는, 블루오션 전략과 트리즈의 예측 방법과 Computer Aided Innovation Software를 포괄하는 DFSS의 확대 Process 와 그 효용에 대해서 본 논문에서 설명하고자 한다.

• 품질경영학회지
• /
• 제38권3호
• /
• pp.340-353
• /
• 2010

Properly designed and well-executed services enable e-commerce companies to capture the unique needs and preferences of customers, help them build customer loyalty, and thereby, strengthen their competitiveness in the marketplace. An object of this study is the new open-market company and it has only 3 percent of the market share. Therefore, it is needed to raise the market share by improving the service qualities. This article presents a six sigma project for service quality improvement in the open-market company. This study was carried out based on five steps of DMAIC which is six sigma technique. First, a defect rate was defined as unsatisfaction rate. In addition, 50-people data was analyzed and it was shown that the defect level was 2.5 sigma level. In this study, in order to raise the sigma level, novel eight action items were determined based on SIPOC, FDPM, cause and effect diagram, matrix chart, Pareto chart and statistical analysis.

• 대한안전경영과학회지
• /
• 제16권1호
• /
• pp.169-176
• /
• 2014

This research discusses the characteristics and the implementation strategies for two types of quality metrics to analyze innovation effects in six sigma projects: fixed specification type and moving specification type. $Z_{st}$, $P_{pk}$ are quality metrics of fixed specification type that are influenced by predetermined specification. In contrast, the quality metrics of moving specification type such as Strictly Standardized Mean Difference(SSMD), Z-Score, F-Statistic and t-Statistic are independent from predetermined specification. $Z_{st}$ sigma level obtains defective rates of Parts Per Million(PPM) and Defects Per Million Opportunities(DPMO). However, the defective rates between different industrial sectors are incomparable due to their own technological inherence. In order to explore relative method to compare defective rates between different industrial sectors, the ratio of specification and natural tolerance called, $P_{pk}$, is used. The drawback of this $P_{pk}$ metric is that it is highly dependent on the specification. The metrics of F-Statistic and t-Statistic identify innovation effect by comparing before-and-after of accuracy and precision. These statistics are not affected by specification, but affected by type of statistical distribution models and sample size. Hence, statistical significance determined by above two statistics cannot give a same conclusion as practical significance. In conclusion, SSMD and Z-Score are the best quality metrics that are uninfluenced by fixed specification, theoretical distribution model and arbitrary sample size. Those metrics also identify the innovation effects for before-and-after of accuracy and precision. It is beneficial to use SSMD and Z-Score methods along with popular methods of $Z_{st}$ sigma level and $P_{pk}$ that are commonly employed in six sigma projects. The case studies from national six sigma contest from 2011 to 2012 are proposed and analyzed to provide the guidelines for the usage of quality metrics for quality practitioners.

• 대한안전경영과학회지
• /
• 제15권1호
• /
• pp.293-301
• /
• 2013

The purpose of this study is to introduce the limit of previously used six sigma quality process evaluation metrics, $Z_{st}$ and $P_{pk}$, and a solution to overcome this drawback by using a metric based on performance evaluation of Z-factor quality innovation. Case analysis on projects from national six sigma contest from 2011 to 2012 is performed and literature review on new drug development HTS (High Throughput Screening) is used to propose innovative performance evaluation metrics. This research shows that experimental study on six sigma evaluation metric, $Z_{st}$ and $P_{pk}$, have no significance difference between industrial type (Manufacturing, Semi-Public Institute, Public Institute) and CTQ type (Product Technology Type CTQ, Process Technology Type CTQ). Following discovery characterize this quality improvement as fixed target type project. As newly developed moving target type of quality innovation performance metric Z-Factor is used for evaluating experimental study, hypothetical analysis suggests that $Z_{st}$ and $P_{pk}$ share different relationship or even show reciprocal relationship. Constraints of the study are relatively small sample size of only 37 projects from past 2 years and conflict on having interview and communication with six sigma quality practitioner for qualitative experimental study. Both moving target type six sigma innovation project and fixed target type improvement project or quality circle enables efficient ways for a better understanding and quality practitioner use by applying quality innovation performance metric. Downside of fixed target type quality performance evaluation metric, $Z_{st}$ and $P_{pk}$, is presented through experimental study. In contrast, advantage of this study is that high throughput requiring product technology, process technology and quantum leap typed innovation effect is evaluated based on precision and accuracy and Z-Factor that enables relative comparison between enterprises is proposed and implemented.

• 품질경영학회지
• /
• 제36권1호
• /
• pp.62-71
• /
• 2008

Since the Six Sigma strategy was first introduced to Motorola in 1987, it has been taken as an important business strategy to strengthen the competitiveness of leading companies in the global competitive environment. To keep growing and thriving, modern companies need to develop new businesses and find new applications while keeping existing ones on track. This situation necessitates a more effective way of discovering an optimal scenario in a business. In this paper, we propose a Business for Six Sigma (BFSS) road-map to create new businesses. BFSS consists of five macro phases: define, identify, analyze, evaluate, and implement. We also provide an example of F electronics, a Korean electronics component manufacturer, which actually applied the BFSS road-map to analyze marketability, technological plausibility and economic potential/success in connection with its new product development.

• 한국품질경영학회:학술대회논문집
• /
• 한국품질경영학회 2006년도 춘계학술대회
• /
• pp.431-436
• /
• 2006

6 Sigma uses DMAIC (Define, Measure, Analyze, Improve, Control) methodology as process of solving problem. Enterprise already propelling successfully 6 sigma such as Motorolla, GE and consulting companies leading 6 sigma also propose DMAIC methodology traditionally. But from making 6 sigma activated, enterprises and 6 sigma consulting companies propose 6 sigma methodology matching office indirection part and research and development part. As the forward example, DFSS(Design For Six Sigma) is R&D part application in GE. This study investigates 6 sigma methodology corresponding to Right Process of the kernel factor. Especially for optimum design of the R&D part, revise DFSS definition and general concept organization through Lean DFSS methodology research and analysis.