• International Journal of Quality Innovation
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• v.8 no.3
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• pp.23-34
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• 2007

Many practitioners strive to increase the efficiency of their product development. In addition, smaller companies must satisfy customers' expectations of their product development. These expectations can be e.g. use of specific methodologies such as Lean Product Development (LPD) and/or Design for Six Sigma (DFSS). This study attempts to identify differences and similarities between these methodologies and the connection between them. This comparison is of interest to practitioners that must choose a strategy for their product development as well as to researchers. The aim of both methodologies is to reduce waste and time of development and to raise the quality of a product at the very roots of the product: its development. LPD and DFSS help development managers to structure projects and focus as much as possible on customer expectations and satisfaction.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.33 no.4
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• pp.193-200
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• 2010

In this study, we took the census of the project satisfaction level of the employees who have participated in Six Sigma projects. We divided and measured the project satisfaction by the steps of performing the project (team building, execution, ownership and support step). We performed the analysis of variance to show the main factors of project satisfaction level, and the tests of homogeneity to know the relationship the business parts and among the job positions each. The results of analysis showed that the satisfactions of the team building and execution step were significant.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.2108-2115
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• 2008

Using transportations like railway, aviations and roads has been increasing continuously. Traffic accidents have been increasing as well. To prevent or lessen these accidents become a big issue to solve. Therefore, more enforced safety levels are being required to meet. In railway field, continuous efforts of railway safety are being executed to prevent traffic accidents. In present, a railway accident has been decreasing since subway accident happened in Daegu Subway in 2003. However, safety levels in railway field have not yet achieved as much as in advanced countries. Basic concept for enforced safety level in railway system is to prevent or minimize accidents by managing systems like related facilities, management method, organization, education. This is the same concept to minimize error rate in six sigma theory. In this paper, we are to apply six sigma techniques used in manufacturing industry to railway safety and go through ways to make more efficient railway safety system.

• International Journal of Quality Innovation
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• v.8 no.1
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• pp.87-98
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• 2007

A COQ model plays an important role in the total quality cost survey. Based on the methodology of continuous quality improvement, a dynamic COQ model for different quality level is developed in this paper. A quality level is defined by Six Sigma level that can be measured by two indicators. The relationships among the four major quality costs are analyzed. Finally, the curves of total quality costs for different quality level are presented.

• Korean Journal of Construction Engineering and Management
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• v.8 no.4
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• pp.185-193
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• 2007

In order to improve the performance of succeeding superstore construction projects, it is essential to find out an effective way for applying the opportunities of improvement on their repetitive construction process based upon the analysis of various success or failure cases occurred on previous similar projects. This research study suggests a way to improve their construction process through the applications of six sigma techniques on superstore construction projects. A literature review was implemented on the basic concept of six sigma and its general performance steps, and the step by step applications of six sigma techniques were accomplished regarding to the speciality of superstore construction projects. The opportunities of improvement for superstore projects were figured out, and the result of their applications on other superstore projects was analyzed. As a result, it was found that the adoption rate of identical success or failure cases was increased. Also, there were several improvement effects on the projects such as $10{\sim}20$ days of time savings by projects, decrease of reworks by preventing failure cases, quality and safety improvement. These results indicate that the six sigma techniques are applicable and valuable for improving the repetitive process of superstore construction projects.

• Proceedings of the Safety Management and Science Conference
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• 2010.11a
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• pp.639-649
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• 2010

신뢰성 기술은 제품이 고장 없이 일정기간 사용할 수 있게 하는 기술로 시장점유율과 고객만족을 높이는 효과적이고 전략적인 필수 요소이다. 검사시점의 적합성에 대한 평가가 아닌 제품 및 시스템의 설계에서부터 폐기까지의 제품수명주기에 대한 신뢰성 평가를 다루는 제품의 신뢰성인증과 신뢰성경영시스템 인증 확보가 시급한 과제이다. 이를 위한 제품 수명의 평균과 분산을 효과적으로 관리할 수 있는 신뢰성 식스시그마 기술개발과 확보가 중요 현안과제이다. 정규분포를 가정한 대부분의 품질경영시스템에서의 식스시그마 접근법은 비정규 분포를 따르는 신뢰성특성과 실험계획기법 등을 고려해야 하는 신뢰성 식스시그마에서의 적용의 한계가 많다. 본 연구에서는 품질혁신 방법론인 식스시그마 기법을 토대로 신뢰성경영시스템에서 맞는 식스시그마 구축의 방향성을 제시하고자 한다.

• Journal of the Korean Society for information Management
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• v.24 no.1 s.63
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• pp.5-29
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• 2007

With the environmental changes around libraries and information centers, they need to develop various management techniques and apply them to library works and services. In this research a case study was conducted in a special library of If company. This study was aimed for reducing ineffective components and unnecessary processes in library works and services. This study applied the Six sigma technique to improve the process of purchasing overseas academic and strategic Information and users' a degree of satisfaction on information service. Specifically, this study used the live-step DMAIC(Define, Measure, Analyze, Improve, Control) method, mainly used in the manufacturing sector. As a result of this study, we could get epoch-making improvement.

• Journal of KIISE:Software and Applications
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• v.33 no.11
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• pp.923-935
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• 2006

As the knowledge-based society has been constructed, the size of work process that has to be done grows bigger and the amount of the information that has to be analyzed increases. So each company is trying to construct more conformable process models in business model. In order to support the process construction of companies practically, in this paper tools of Six Sigma is applied to process definition and tools of PSP is applied schedule management. And to use the proposed tools efficiently, the procedure of process definition and schedule management are suggested. The goal of the proposed method is to achieve the process aim within the Time-To-Market by applying the process management of organizations and persons. And the goal of individuals is to improve personal process with the collected data.

• Proceedings of the Safety Management and Science Conference
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• 2004.11a
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• pp.61-68
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• 2004

• Journal of Digital Convergence
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• v.10 no.2
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• pp.225-229
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• 2012

A reformer for a small fuel cell system is an apparatus which converts hydrocarbon fuel into hydrogen-rich gas. Among many indices of a reformer, the most crucial index of a reformer is CO concentration in the off-gas out of reformer which must be controled under 5ppm for the efficiency and performance of a system. This paper suggests the criteria of a reformer operation for the stability of a reformer in a fuel cell system by deducing crucial indices and improving processes. The six-sigma technique was applied to verify the optimum control and operation of a reformer of a fuel cell combined heat and power system. The result of temperature control of each parts of a reformer system is the concentration of CO which is the most important factor for the operation of a fuel cell system. The temperature of the parts of a reformer, MTS, LTS and Prox, were controled so that the concentration of CO.