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Optimal Screening Procedures for Improving Outgoing Quality Based on Correlated Normal Variables
Riew, Moon-Charn,Bai, Do-Sun The Korean Statistical Society 1985 Journal of the Korean Statistical Society Vol.14 No.1
Optimal screening procedures for improving outgoing product quality based on correlated normal variables are presented. The performance variable and the screening variables are assumed to be jointly normally distributed. These procedures do not require specialized tables, and closed-form solutions are obtained for the case of one-sided specification. Methods for finding optimal solutions for the case of two-sided specifications are also considered.
류문찬 ( Moon Charn Riew ),신지연 ( Ji Yeon Shin ) 한국품질경영학회 2013 품질경영학회지 Vol.41 No.4
Purpose: Methods for increasing health-care service quality are considered for a women-centered hospital located on a local city. A walk-through audit is applied to uncover areas for improvement. Methods: A survey questionnaire with 25 questions is constructed based on a service blueprint for a walk-through audit, and a survey is conducted both to patients and service providers to assess a health-care service quality. Frequency analysis, statistical tests and customer-provider analysis are used to analyze surveyed data. Results: According to customer-provider analysis, 6 attributes belong to ‘problem unawareness’ zone in which they are rated high by service providers but low by patients, and another 6 attributes belong to ‘problem awareness’ zone in which they are rated low by both groups. These attributes are considered to be improved with priority. Conclusion: Both patient group and service provider group have lots of different perceptions on most attributes that are examined, and the hospital to be studied is, in general, competitive in technical quality and less competitive in functional quality.
QFD 를 이용한 품질경영 시스템의 개발모듈에 대한 이행도 평가모형
류문찬,우성권 한국품질경영학회 2002 품질경영학회지 Vol.30 No.2
A performance evaluation model of an R&D module in the quality management system for M Company is constructed using QFD. The company produces telecommunication devices and employs the performance evaluation model based on ISO 9000 family. However, the model has some problems; one of them is that all check items are regarded as equally important. Customer requirements are gathered from internal customers and QFD is utilized to obtain weights for each check item.
나경환,류문찬,민대환,최석우 高麗大學校産業開發硏究所 1998 産業開發硏究 Vol.6 No.-
CIM 시스템으로 구축 중에 있는 시범 플랜트의 구성안에 대하여 시뮬레이션에 의하여 생산능력과 병목공정 등을 분석하였다. 이 공장은 고정밀 성형제품을 냉간단조 방식으로 생산하게 되는데, 사용하는 원자재의 재질에 따라 공정의 일부가 달라지기 때문에 핀홀 및 열처리 공정이 있는 경우(제1 구성안)와 이를 배제한 경우(제2 궁성안)의 두 가지 구성안에 대하여 시뮬레이션을 수행하였다. 시뮬레이션 언어로는 Visual SLAM을 채택하였으며, 시범플랜트에 투입되는 장비의 성능을 고려하여 4가지 대안을 선정하여 분석을 하였다. 제1 구성안은 모든 대안이 원 생산목표를 만족하지만, 제2 구성안의 경우는 한가지 대안만 만족하였으나, 월 20일 근무를 가정하였기 때문에 근무일을 다소 늘리면 어느 경우나 생산목표량을 충족시킬 수 있다고 할 수 있다. 제1 구성안은 라인균형화 면에서 제2 구성안보다 문제점을 노출하고 있기 때문에 대기물량에 대한 각별한 관리가 요구된다. 생산 목표량이 증가하게 되면 전조기의 대수를 2대에서 3대로 늘리는 방안이 유력한 대안이다.
카노모형에서 의사결정나무모형을 이용한 통상우편서비스 품질속성 분석
최현덕 ( Hyeon Deok Choi ),류문찬 ( Moon Charn Riew ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.4
Purpose: The demand for ordinary mail services supplied by `Korea POST` is decreasing due to the opening of mail service market and the growth of alternative communication media such as e-mail and SNS. To over-come this situation it is urgent to introduce new services that can be able to appeal customers and to improve existing services. Methods: A field survey is conducted to corporate customers who send ordinary mails and individual customers who receive these mails, respectively. Quality attributes of ordinary mail services are classified by two-di-mensional perspectives in terms of Kano model. Decision tree model is utilized for classifying the quality attributes. Comparative analyses are done whether there are perceived differences on each quality attributes between corporate customers and individual customers. Results: Quality attributes such as `discount postal charges`, `sending small packages by simply dropping it into a mail box`, `sending a mail of any appearance`, `delivering a mail anywhere`, and `receiving a mail at a preferred time where a customer is located ` are classified differently according to some market segments, while most of the quality attributes are classified as attractive or one-dimensional. Conclusion: Decision tree model has been found to be most effective to classify quality attributes for each market segment especially when trying to classify quality attributes belonging to `gray areas`. Based on the perceived differences on quality attributes among customers, strategic implications are suggested to obtain potential customers and to have competitive advantages.
류문찬,임성택,정상철,이상덕,신석규,Riew, Moon-Charn,Rim, Seong-Taek,Chung, Sang-Chul,Lee, Sang-Duk,Shin, Suk-Kyu 한국정보기술응용학회 2001 정보기술응용연구 Vol.3 No.4
Improving software product quality is a key to increasing user satisfaction and to achieving competitive edge. There are two approaches to assure high software product quality; development process-oriented and product-oriented. There have been many efforts for improving software quality through process certification, for example, CMM, ISO 9000 family, ISO/IEC 12207, SPICE and Bootstrap. However, a good process alone cannot guarantee good product quality. A need for the evaluation of software product quality by an independent third party is growing rapidly for several reasons. We are concerned with an application of Statistical Quality Control (SQC) to the evaluation of software product quality to obtain the efficiency of evaluation processes and the objectivity of evaluation results. Methods for selecting test cases using a random sampling approach have been discussed and methods for selecting acceptance criteria with respect to software product quality have also been suggested.