• 품질경영학회지
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• 제30권1호
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• pp.74-96
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• 2002

The objectives of this study is to suggest the rectifying sampling inspection plan considering quality cost. Limiting quality level(LQL) plans(also called LTPD plans) and outgoing quality(OQ) plans are considered. The Hald's linear cost model is discussed with and without a beta prior for the distribution of the fraction of nonconforming items in a lot. It is assumed that the sampling inspection is error free. We consider the design of reliability acceptance sampling plan (RASP) for failure rate level qualification at selected confidence level. The lifetime distribution of products is assumed to be exponential. MIL-STD-690C and K C 6032 standards provide this procedures. But these procedures have some questions to apply in the field. The cost of test and confidence level(1-$\beta$ risk) are the problem between supplier and user. So, we suggest that the optimal life test sampling inspection plans using simple linear cost model considering product cost, capability of environment chamber, environmental test cost, and etc. Especially, we consider a reliability of lots that contain some nonconforming items. In this case we assumed that a nonconforming item fail after environmental life test. Finally, we develope the algorithm of the optimal sampling inspection plan based on minimum costs for rectifying inspection and RASP. And computer application programs are developed So, it is shown how the desired sampling plan can be easily found.

• 품질경영학회지
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• 제21권1호
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• pp.108-120
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• 1993

In this article an economic life test sampling plan is considered for repairable products when the products in each lot have the same interfailure time distribution, but the mean time between failure (MTBF) of a lot varies from lot to lot according to a known prior distribution. A cost model is constructed which consists of test cost, accept cost, and reject cost. Determination of the optimal plan which minimizes the expected average cost per lot is discussed. Numerical examples are presented to illustrate the use of the proposed sampling plans and sensitivity analyses for parameters of the prior distribution are performed.

• 대한안전경영과학회지
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• 제21권2호
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• pp.15-23
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• 2019

Among service industries of knowledge based economic era, the roles of educational service field are becoming more important and standard of educational service makes a direct effect on economic development and social growth. Therefore, accurate measurement of service quality is the most important assignment and the measurement of the service quality remains difficult assignment. So, this researcher classified quality attributes applying weighted value and found potential satisfaction level(PSL) and potential customer demand improvement index(PCDI) for trainees participating in national manpower business so as to suggest measurement of service quality and easiness of use and then, calculated satisfaction position and opportunity cost by quality factor with Taguchi's loss fraction. And, improvable satisfaction level was measured, opportunity cost by degree of customer dissatisfaction was quantitatively measured, and a model that can indicate with economic factors was suggested. In addition, methodology of measuring quality cost that can be reduced by quality improvement and direction of strategic decision-making for deciding items to be improved preferentially were suggested with qualitative index that can indicate the degree of customers' dissatisfaction by loss.

• 대한토목학회논문집
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• 제38권2호
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• pp.327-335
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• 2018

건설공사의 품질관리비를 산정하기 위해서는 관련 법 규정에 따라야 하며 세부적으로는 품질시험비와 품질관리활동비 등 여러 항목의 비용 산출이 요구된다. 품질관리비 중에서 인건비는 건설공사 품질관리 업무지침의 품질시험비 산출단위량을, 인건비의 노임단가의 적용은 대한건설협회 및 한국엔지니어링협회가 조사 공표하는 노임단가를 적용하도록 규정하고 있다. 그러나 관련 법 규정에서 품질관리자와 품질시험자의 인건비 적용기준이 서로 모호하게 규정되었으며, 건설공사의 품질관리비 산정 및 인건비 적용 등에 혼란을 유발 하였다. 또한 품질관리자의 배치기준에 대하여 공사규모에 따라 규정하고 있으나 품질시험자의 배치기준에 대한 규정은 없으며, 건설현장에서는 품질관리자 외 품질시험자의 배치인력이 없거나 매우 적은 인력을 배치하는 등 소극적인 행태로 인하여 품질시험자가 실시해야 할 품질시험 업무를 품질관리자가 실시하고 있어 과중한 업무로 인하여 품질관리 활동의 저조와 품질확보가 어려운 현실이다. 본 연구에서는 건설공사의 품질확보 및 부실공사 방지를 위하여 품질관리비의 인건비 산정과 품질관리자 및 품질시험자의 배치기준을 다음과 같이 정립하고 제시한다. 관련 법 규정에서 모호하게 규정하고 있는 배치기준을 품질관리자와 품질시험자로 구분하여 공사규모에 따라 배치하도록 규정하고, 한국엔지니어링협회의 노임단가를 기준으로 하여 품질관리자 및 품질시험자의 인건비를 각각 기술자(기술사, 특급, 고급, 중급, 초급) 및 숙련기술자(고급, 중급, 초급)의 노임단가를 적용하도록 제시한다.

• International Journal of Quality Innovation
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• 제3권2호
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• pp.159-173
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• 2002

Any organization's Six Sigma program may be at high risk without heeding the lessons learned from the past and that tries to operate without a robust business foundation. A foundation that preferably should consist of stepping-stones such as a 5-S house-keeping program, an effective Integrated Management System (IMS), which includes a strong focus on planning for quality to fully capture the Voice of the Customer (VOC), and an organization-wide training scheme, as well as a reliable Cost of Poor Quality (COPQ) system. That's the best advise I can give to any organization that wishes to embark on a Six Sigma improvement program and hope to be successful. The paper will elaborate on the above issues and provide suggested solutions based on the review of published historical information and the experiences encountered over the last four decades by the author, as a quality practitioner and consultant, in industries that produced safety-critical product. This author maintains that few fundamentally new or useful things have been created in the field of Quality during the last couple of decades. Nevertheless, this paper deliberates on a number of relatively “newer” issues including the concept of “three types of customers”, the CTC, “Critical To Customer” term, the eight Quality Management Principles of the new ISO 9000 family, the growth of industry-specific standards, the adoption of Integrated Management Systems, the rebirth of AS2561 COQ standard, the spread of Six Sigma as well as related ASQ certification and the need for a robust business foundation to ensure Six Sigma survival.

• 한국산학기술학회논문지
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• 제21권9호
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• pp.218-228
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• 2020

소재 산업은 공정 기술을 활용하여 최종 제품에 적용되는 부품을 생산하며 완성품의 품질을 결정하는 중요한 기반 산업이다. 그러나 최근 시장 환경이 악화되고 3D 업종으로 인식되어 다른 소재 산업 국가에 비해 경쟁력을 잃어가고 있는 실정이다. 본 연구는 단조 기업의 특성을 분석하고 품질 비용 범위를 설정하여 해당 산업에 특화된 품질 비용 관리 체계 및 지속적 품질 개선 방안에 대한 프로세스를 개발한다. 본 연구를 통해서 단조 산업의 세 가지 특성인 설비 의존, 수주 위주, 현장 중심을 발견하고 내부 실패 비용과 외부 실패 비용을 품질 비용 범위로 설정하였다. 대형 단조업체인 A기업에 대해서 개발된 품질 비용 관리 체계와 지속적 품질 개선 프로세스를 적용하여 총 8개의 품질 과제를 발굴하였으며, 개선 활동 결과 전년 대비 약 63.3%의 품질비용 저감을 확인하여 그 실효성을 증명하였다. 본 연구는 단조 기업들이 체계적으로 품질 비용을 관리하고 분석하여 품질 경영전략 방향성을 수립할 수 있도록 도움을 줄 것으로 판단된다.

• 한국병원경영학회지
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• 제11권3호
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• pp.73-93
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• 2006

This study aims at providing necessary informations for management decision-making to the hospital manager, such as ratios of fixed and variable cost to total operating expense, and variable cost ratio to operating revenues, and determinant factors affecting cost behavior. A study model and related hypotheses were established, data were collected from 41 private university hospitals for the 6years from 1998 to 2003, and regression analyses were performed to test the hypotheses. The results of the analyses and conclusions are as follows; First, labor cost and administration cost within the same number of beds have not only fixed quality of the cost, but variable quality of that. Also, the ratio of the variable costs to operating revenue of the metropolitan was estimated 76.9% and that of other area hospitals was 80.1%. Second, the major factors affecting the increase rate of the operating expense were the increase rates of the number of inpatients, the number of employee, and the number of hospital operating bed. This result implies that maintaining a optimal hospital bed size and efficient operation of the beds are important strategic factors of hospital management.

• 품질경영학회지
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• 제18권1호
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• pp.116-128
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• 1990

Consumer's demand level for products and goods selection power is considerably improved. The pressure of loss compensation is also being accelerated by products which bring damage on property. The producer prevents the loss from causing poor products and considering the quality cost allotment in these circumstances. That is to say, producer should be concerned with the strategy of product liability prevention instead of passive defence policy. This paper intends to estabilish the optimum quality cost in considering product liability, and present the correlation of quality cost elements and multiple regression analysis. It can utilized in qualitycost and budget planning.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2004년도 품질경영모델을 통한 가치 창출
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• pp.519-530
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• 2004

• International Journal of Quality Innovation
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• 제7권3호
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• pp.15-23
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• 2006

A spare ordering policy is considered for planned maintenance. Introducing the ordering, uptime, downtime, inventory costs and salvage value, we derive the expected cost effectiveness. The problem is to determine jointly the ordering time for a spare and the preventive replacement time for the operating unit which maximize the expected cost effectiveness. Some properties regarding the optimal policy are derived, and a numerical example is included to explain the proposed model.