• Title, Summary, Keyword: Importance

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Joint Structural Importance of two Components

  • Abouammoh, A.M.;Sarhan, Ammar
    • International Journal of Reliability and Applications
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    • v.3 no.4
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    • pp.173-184
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    • 2002
  • This paper introduces the joint structural importance of two components in a coherent system. Some relationships between joint structural importance and marginal structural importance are presented. It is shown that the sign of Joint structural importance can be determined, in advance, without computation in some special structures. The joint structural importance of two components in some series-parallel and parallel-series systems are established. Some practical examples are presented to elucidate some of the derived results.

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Importance Analysis of In-Service Testing Components for Ulchin Unit 3 Using Risk-Informed In-Service Testing Approach

  • Kang, Dae-il;Kim, Kil-yoo;Ha, Jae-joo
    • Nuclear Engineering and Technology
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    • v.34 no.4
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    • pp.331-343
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    • 2002
  • We performed an importance analysis of In-Service Testing (157) components for Ulchin Unit 3 using the integrated evaluation method for categorizing component safety significance developed in this study. The developed method is basically aimed at having a PSA expert perform an importance analysis using PSA and its related information. The importance analysis using the developed method is initiated by ranking the component importance using quantitative PSA information. The importance analysis of the IST components not modeled in the PSA is performed through the engineering judgment, based on the expertise of PSA, and the quantitative and qualitative information for the 157 components. The PSA scope for importance analysis includes not only Level 1 and 2 internal PSA but also Level 1 external and shutdown/low power operation PSA. The importance analysis results of valves show that 167 (26.55%) of the 629 IST valves are HSSCs and 462 (73.45%) are LSSCs. Those of pumps also show that 28 (70%)of the 40157 pumps are HSSCs and 12 (30%) are LSSCs.

Improvement of Service Tree Analysis Using Service Importance (서비스 중요도를 사용한 서비스나무분석의 개선)

  • Park, Jong Hun;Hwang, Young Hun;Lee, Sang Cheon
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.40 no.2
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    • pp.41-50
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    • 2017
  • The purpose of this paper is to improve the service tree analysis introduced recently by Geum et al. [15]. Service tree analysis structures the service based on the customer participation perspective and provides a qualitative analysis method categorizing the service elements on the basis of its impact to top service. This paper attempts to apply the concept of reliability importance to the service tree analysis as a perspective of quantitative analysis, which is considered little in Geum et al. [15]. Reliability importance is a measure of the structural impact of the components that make up the system on the system lifetime in reliability engineering field and often used in fault tree analysis. We transform the reliability importance into service importance in accordance with service tree analysis, so that the influence of service elements on the service can be judged and compared. The service importance is defined as the amount of change of the service according to the change of the service element, therefore, it can be utilized as an index for determining a service element for service improvement. In addition, as an index for paired service elements, the relationship between the two service components can be measured by joint service importance. This paper introduces conceptual changes in the process of applying reliability importance to service analysis, and shows how to use the service importance for identifying the priority of service element for the final service and improving customer satisfaction through an example. By using the service importance and joint service importance in service tree analysis, it is possible to make efficient decision making in the process of determining the service elements for analyzing and improving the service.

An Evaluation of the Foodservice Quality and Management of Preschool Foodservice Establishments by IPA - Focusing on Parents of Preschoolers in Metropolitan Area of Korea, China and Japan - (IPA분석을 통한 미취학 아동 급식의 급식서비스 품질특성 및 급식운영 평가 - 한국·중국·일본의 미취학 아동을 자녀로 둔 부모를 대상으로 -)

  • Park, Sanghyun;Joo, Nami
    • The Korean Journal of Food And Nutrition
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    • v.28 no.1
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    • pp.160-169
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    • 2015
  • This study was targeted on the Korean, Chinese, and Japanese parents of preschoolers to investigate the importance and satisfaction of foodservice quality and the importance and performance of foodservice management of the preschool foodservice establishments. The present study conducted a survey on 390 randomly chosen parents of preschoolers (130 Korean, 130 Chinese, and 130 Japanese). Respondents' importance-satisfaction of foodservice quality characteristics and their importance-performance of foodservice management were measured. In order to test for differences between the groups, paired t-test, one way ANOVA, and IPA (Importance-Performance Analysis) were performed. The results were as follows. The importance of foodservice quality was significantly higher than the satisfaction on all items, according to the parents of Korea, China, and Japan. The importance of foodservice quality was higher in Korean parents than in Chinese and Japanese parents. According to ISA results with foodservice quality characteristics, the characteristics with relatively low satisfaction but high importance (II quadrant) was 'Diversity of menu' in both Korean and Chinese parents, and 'Sanitation of tables and chairs' in both Korean and Japanese parents. The importance of foodservice management was significantly higher than performance on all items in Korean, Chinese and Japanese parents. The performance of foodservice management was higher in Chinese than in Japanese and Korean parents. According to IPA results with foodservice management, the management with relatively low performance but high importance (II quadrant) was 'Preparation' in Korean parents, and 'Facility and equipment' in Japanese parents. Therefore, the items with relatively low satisfaction (performance) and high importance should be well-managed.

The Level of Importance and Performance of Patient Education perceived by Patients and Nurses (입원 환자와 간호사가 지각하는 환자 교육 중요도와 간호사의 교육 수행 정도)

  • Koo, Hyun-Young
    • The Journal of Korean Academic Society of Nursing Education
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    • v.8 no.1
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    • pp.29-37
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    • 2002
  • This study was performed to investigate the level of importance and performance of patient education perceived by patients and nurses. The subjects consisted of 108 patients and 106 nurses in one university-affiliated hospital in Daegu, from February 1 to February 5, 2002. Data were collected through self-report questionnaires which were constructed to include the level of importance and performance of patient education. The data were analyzed by an SPSS program. 1) The level of importance of patient education perceived by patients and nurses was high, but the level of performance of patient education was relatively low. The level of importance and performance of patient education perceived by patients and nurses ranked as the highest in the area of diagnosis and treatment. 2) The level of importance and performance of patient education perceived by patients was not different according to general characteristics. The level of importance and performance of patient education perceived by nurses was different according to age and the working unit and the level of performance of patient education was different according to clinical career and job position. These results suggest that the level of importance of patient education perceived by patients and nurses was different to the level of performance of patient education perceived by them. Therefore nurses should actively provide patients with the educational program based on the importance of patient education perceived by patients.

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A Study on the Service Facilities Plan for APT Community Culture Activation (공동체 문화 활성화를 위한 APT단지 부대복리시설 계획에 관한 연구)

  • Lee, Gwang-Young;Cho, Jin-Man
    • Journal of the Korean housing association
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    • v.19 no.2
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    • pp.55-62
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    • 2008
  • This study is researched to provide design guidelines of service facilities and programs that apartment residents want along with the increased quality of life. This study is signifiant because it sought effective methods to activate the com-munity culture through service facilities in apartment complexes and the design standard and planning direction for residents. The study results are as follows. In the result of the correlations analysis and multiple regression analysis for the importancy of service facilities in apartment complexes, the following orders were considered as important factor; man-ager office, open space, resident community facility, elderly people meeting and activity facility, walking paths, resident athletic facility, a children's playground, library, and rest areas in the complex. and result of the correlations analysis and multiple regression analysis is the following: service facilities whole importance (y) = 1.413$+0.262^*{\times}1$ (manager office importance)$+0.271^*{\times}2$ (open space importance) $+0.185^*{\times}3$ (resident community facility importance) $+0.136{\times}4$ (elderly people meeting and activity facility importance)$+0.036^*{\times}5$ (walking paths importance) $+0.031^*{\times}6$ (resident athletic facility importance) + $(-0.042)^*{\times}7$ (a children's playground importance) + $(-0.045)^*{\times}8$ (library importance) + $(-0.0097)^*{\times}9$ (rest areas importance).

Determining the Importance Values of Quality Attributes Using ASC (ASC를 이용한 품질특성의 중요도 결정)

  • Jang, Heung-Yeop;Song, HaeGeun;Park, Young T.
    • Journal of the Korean Society for Quality Management
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    • v.40 no.4
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    • pp.589-598
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    • 2012
  • Purpose: Determination of the importance values of quality attributes is very important to integrate the Kano model with QFD. A new method to determine the importance values of quality attributes is proposed. Methods: ASC(Average Satisfaction Coefficient) is proposed in order to determine the importance values of quality attributes. To evaluate the effectiveness of ASC, a case study of modern TV sets is conducted, and the performance of ASC is compared with direct importance evaluation and AHP pairwise comparisons. Results: The result of ASC application is similar with those of direct importance evaluation and AHP pairwise comparison. Conclusion: ASC is an effective instrument to determine the importance values of quality attributes. It doesn't need a cumbersome process like AHP pairwise comparison, and can be calculated using the data for the conventional Kano model.

Importance and Performance of Dietitian's Task at Long Term Care Hospital Foodservice in Busan.Kyungnam Area (부산.경남지역 요양병원 영양사의 업무에 대한 중요도와 수행도 연구)

  • Park, Mal-Sook;Lyu, Eun-Soon
    • Korean Journal of Community Nutrition
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    • v.16 no.5
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    • pp.602-612
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    • 2011
  • The purpose of this study was to evaluate importance and performance of dietitian's task at long term care hospitals foodservices in the Busan Kyongnam area. The research was performed through using questionnaires and conducted from June 11 to July 16, 2010 for 186 dietitians at 141 long-term care hospitals. Seventy-two percent of hospitals had two dietitians and 69% of them had a dietitian's office. Fifty-two percent of dietitians has worked for less than 2 years at long term care hospital, and 37.1% of them worked additional tasks. Seventy-three percent of hospitals conducted a therapeutic diet program and the therapeutic diets frequently provided were diabetic diet > tube feeding diet > dysphasia diet > sodium controlled diet. Mean score for the importance (4.36/5.00) and performance (3.91/5.00) of dietitian's tasks were significantly different (p < 0.001). The importance and performance grid showed that the purchase-inspection management and sanitation-safety management were high scores to the importance and performance (doing great area), menu-foodservice management and cooking-working management were low scores to the importance and high scores to the importance (overdone area), and nutrition management was low scores to the importance and performance (low priority). Forty-three percent of dietitians agreed with the needs for role separation between foodservice dietitian and clinical dietitian.

Evaluation of the Clothing Store Attributes in the Department Using Importance-Performance Analysis (중요도-성취도 분석에 의한 백화점 의류점포속성 평가)

  • Yang, Lee-Na
    • Korean Journal of Human Ecology
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    • v.17 no.6
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    • pp.1167-1180
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    • 2008
  • The purpose of this study was to take the gauge of the importance-performance of the clothing store attribute in the department store. The survey was administered to customers of department stores in Deajeon city and frequency analysis, factor analysis, reliability analysis, and importance-performance analysis were used to analyze the data of 37 clothing store attributes. The findings of this study were as bellows: 1. 8 factors were distracted from 37 clothing store attributes by factor analysis (Factor 1: goods, Factor 2; store's facility and environment, Factor 3; salesman and service, Factor 4; brand, Factor 5; price, Factor 6; store's atmosphere, Factor 7; convenience of the transportation and access, Factor 8; promotion and advertisement) 2. as results of importance-performance analysis, 10 attributes were shown in area I (high importance and high performance) which needed a strategy of Keep Up the Good Work, 6 attributes in area II (low importance but high performance) fitted a strategy of Possible Overkill, 12 attributes in area III (high importance but low performance) corresponded to a strategy of Concentrate Here, and finally a strategy of Low Priority was needed to 9 attributes in area IV (low importance and low performance).

Development and Implementation of Measures for Structural and Reliability Importance by Using Minimal Cut Sets and Minimal Path Sets (최소절단집합과 최소경로집합을 이용한 구조 및 신뢰성 중요도 척도의 개발 및 적용)

  • Choi, Sung-Woon
    • Journal of the Korea Safety Management and Science
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    • v.14 no.1
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    • pp.225-233
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    • 2012
  • The research discusses interrelationship of structural and reliability importance measures which used in the probabilistic safety assessment. The most frequently used component importance measures, such as Birnbaum's Importance (BI), Risk Reduction (RR), Risk Reduction Worth (RRW), RA (Risk Achievement), Risk Achievement Worth (RAW), Fussel Vesely (FV) and Critically Importance (CI) can be derived from two structure importance measures that are developed based on the size and the number of Minimal Path Set (MPS) and Minimal Cut Set (MCS). In order to show an effectiveness of importance measures which is developed in this paper, the three representative functional structures, such as series-parallel, k out of n and bridge are used to compare with Birnbaum's Importance measure. In addition, the study presents the implementation examples of Total Productive Maintenance (TPM) metrics and alternating renewal process models with exponential distribution to calculate the availability and unavailability of component facility for improving system performances. System state structure functions in terms of component states can be converted into the system availability (unavailability) functions by substituting the component reliabilities (unavailabilities) for the component states. The applicable examples are presented in order to help the understanding of practitioners.