• Title/Summary/Keyword: Reliability standard

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Developing a Performance Appraisal Tool for Neonatal Intensive Care Unit Registered Nurses (신생아중환자실 간호사 업무수행 평가도구 개발)

  • Park, Kwang-Ok;Lee, Yoon-Young
    • The Journal of Korean Academic Society of Nursing Education
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    • v.17 no.2
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    • pp.267-276
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    • 2011
  • Purpose: This study was done to develop a performance appraisal tool (PAT) for neonatal intensive care unit (NICU) registered nurses (RNs). Methods: The PAT was developed in three steps: 1) a standard of NICU nursing was established; 2) a draft was made; and 3) the PAT was ratified and its reliability and validity were tested. Results: The standard of practice of NICU nursing was predominantly based on role description and responsibilities for nurses. We identified 4 domains of nursing: professional practice, education, research, and leadership. The validity score for each item ranged from 3.93 to 3.27. The PAT consisted of 76 indicators, 49 reflecting components of professional practice, 5 related to responsibility for education, 3 representing research, and 19 relating to leadership. Cronbach's ${\alpha}$ averaged 0.99 for the 76 items. Conclusions: The PAT for NICU RNs that we created was found to be reliable and valid. This PAT would be very useful in evaluating nursing performance and facilitate the professional growth of nurses.

A study on the application of the IEC61850 based eCMD convergence structure in Digital Substation (IEC61850 기반 디지털 변전시스템에서의 eCMD 융합화구조 적용에 관한 연구)

  • Lee, D.C.;Kim, H.S.;Bae, U.L.;Min, B.W.
    • Proceedings of the KIEE Conference
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    • 2006.07e
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    • pp.19-22
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    • 2006
  • The CMD(Condition Monitoring & Diagnosis) System is used to monitor and analyze the PD(Partial Discharge), Arc, Temperature, Pressure, Gas in Oil and so on for reliability and availability of the substation. Although this system comes into the spotlight as the forecast and management of the failure and fault, there are some problems. For example, the unified standard was not defined, and the effective management of the layed communication network does not performed, limitation of physical space, etc. To resolve above problems, this paper suggests the IEC61850 compatible eCMD system architecture for monitoring and analyzing the CMD factor in substations. The suggested eCMD system consists of CMD-LU(Condition Monitoring & Diagnosis-Local Unit), IED(Intelligent Electronic Device), and engineering centers. The IEC61850 is the international standard that defines communication networks and system in substation.

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A Study on the Quantitative Determination of Failure Effect Probability for Criticality Analysis on System (시스템의 치명도 분석을 위한 고장영향확률 정량화 방안 연구)

  • Lee, Myeong-seok;Choi, Seong-Dae;Hur, Jang-wook
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.8
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    • pp.31-37
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    • 2019
  • The inter-development of FMECA is very important to assess the effect of potential failures during system operation on mission, safety and performance. Among these, criticality analysis is a core task that identifies items with high risk and selects the analyzed objects as the key management targets and reflects their effects to the design optimization. In this paper, we analyze the theory related to criticality analysis following US military standard, and propose a method to quantify the failure effect probability for objective criticality analysis. The criticality analysis according to the US military standard depends on the subjective judgment of the failure probability. The methodology for quantifying the failure effect probability is presented by using the reliability theory and the Bayes theorem. The failure rate is calculated by applying the method to quantify failure effect probability.

Probabilistic analysis of RC beams according to IS456:2000 in limit state of collapse

  • Kulkarni, Anadee M.;Dattaa, Debarati
    • Structural Engineering and Mechanics
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    • v.71 no.2
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    • pp.165-173
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    • 2019
  • This paper investigates the probability of failure of reinforced concrete beams for limit state of collapse for flexure and shear. The influence of randomness of the variables on the failure probability is also examined. The Indian standard code for plain and reinforced concrete IS456:2000 is used for the design of beams. Probabilistic models are developed for flexure and shear according to IS456:2000. The loads considered acting on the beam are live load and dead load only. Random variables associated with the limit state equation such as grade of concrete, grade of steel, live load and dead load are identified. Probability of failure is evaluated based on the limit state equation using First Order Reliability Method (FORM). Importance of the random variables on the limit state equations are observed and the variables are accordingly reduced. The effect of the reduced parameters is checked on the probability of failure. The results show the role of each parameter on the design of beam. Thus, the Indian standard guidelines for plain and reinforced concrete IS456:2000 is investigated with the probabilistic and risk-based analysis and design for a simple beam. The results obtained are also compared with the literature and accordingly some suggestions are made.

A Structural Relationship between Perfectionism, Dance Commitment, Career Decision Self-Efficacy, and Dance Achievement of Middle and High School Students Majoring in Dance

  • Min, Yun-Mi
    • International journal of advanced smart convergence
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    • v.10 no.3
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    • pp.172-180
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    • 2021
  • The purpose of this study is to analyze the structural relationship among perfectionism and dance achievement of middle and high school students majoring in dance. Specifically, this study aims to investigate the effects of perfectionism on dance achievement through the medium of dance commitment and career decision-making self-efficacy. For this purpose, a structural equation model based on the previous studies was constructed with perfectionism as an exogenous variable and dance commitment, career decision-making self-efficacy, and dance achievement as endogenous variables. The final subjects of this study were 279 middle and high school students majoring in dance. The data were processed by frequency analysis to find out personal characteristics using SPSS 23 and exploratory factor analysis and reliability analysis were conducted on the research tools. In addition, AMOS 21 was used for confirmatory factor analysis, correlation analysis and structural equation model analysis. As a result of data processing on the research model. First, the sub-dimensions of perfectionism tendency 'worry about mistakes', 'personal standard', and 'doubt about behavior' had a statistically significant effect on dance commitment. Second, the sub-dimensions of perfectionism 'worry about mistakes', 'personal standard', and 'doubt about behavior' had statistically significant effects on career decision-making self-efficacy. Third, dance commitment did not have a statistically significant effect on dance achievement, but career decision-making self-efficacy had a statistically significant effect on dance achievement. These results provide implications.

Analytic Comparisons of Shipbuilding Competitiveness between China and Korea

  • Lee, Koung-Rae
    • Journal of Korea Trade
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    • v.23 no.4
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    • pp.1-16
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    • 2019
  • Purpose - This research empirically proves that global shipbuilding industry leadership has moved to China from Korea. Design/Methodology - Competitiveness is measured by AHP for the weights of comprehensive competitiveness, which is the output mixture of three attributive factors: shipbuilding technology, shipbuilding contract price, and export credit. Findings - China is far ahead of Korea for standard vessels such as bulkers and containerships with competitiveness weights of 0.762 and 0.612, respectively, against 0.238 and 0.388 of Korea. Korea is maintaining its competitiveness only in LNG carriers (174k CBM) with a competitiveness weight 0.621. China and Korea have similar competitiveness for chemical carriers, complex vessels with a small hull size. The sources of Chinese competitiveness are shipbuilding contract price and export credit. With the majority share of standard vessel types in the world fleet, China will hold a bigger market share than Korea in the global shipbuilding industry in the forthcoming years. Implications - The swing factors of market power are shipbuilding technology and contract price. If China fails to further develop shipbuilding technology for shipowners worried about the reliability of the Chinese-built vessels, shipowners may swing back to Korea. The rising Chinese labor cost will expedite this swing in the forthcoming competition. Originality/value - To the best of the author's knowledge, this is the first paper that quantitatively examines the competitiveness of shipbuilding between China and Korea by comparing attributive factors for competitiveness.

On the Integrated process of RSS model and ISO / DIS 21448 (SOTIF) for securing autonomous vehicle safety (자율주행 자동차 안전성 확보를 위한 RSS 모델 및 ISO/DIS 21448 (SOTIF) 통합 프로세스 구축에 관한 선행연구)

  • Kim, Min Joong;Kim, Tong Hyun;Kim, Young Min
    • Journal of the Korean Society of Systems Engineering
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    • v.17 no.2
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    • pp.129-138
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    • 2021
  • Today, as the number of vehicles equipped with autonomous driving functions increases, the use of various sensors increases, and the complexity of system configuration increases. The ISO 26262 standard was published to prevent caused by systematic errors. Recently, the issue of external environmental factors rather than mechanical failure has increased. This issue is a problem outside of the scope of ISO 26262, and the ISO/DIS 21448 standard was published to solve this problem. Also, Mobileye proposed the RSS model that defined safe distance for dangerous situations in order to secure the safety of autonomous vehicles and who is responsible in case of an accident. In this paper, integrated process of ISO 21448 and RSS model, and through these results, we expect that possible to contribute to securing the safety and reliability of autonomous vehicles in the future.

Numerical comparison between lattice and honeycomb core by using detailed FEM modelling

  • Giuseppe, Pavano
    • Advances in aircraft and spacecraft science
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    • v.9 no.5
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    • pp.377-400
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    • 2022
  • The aim of this work is a numerical comparison (FEM) between lattice pyramidal-core panel and honeycomb core panel for different core thicknesses. By evaluating the mid-span deflection, the shear rigidity and the shear modulus for both core types and different core thicknesses, it is possible to define which core type has got the best mechanical behaviour for each thickness and the evolution of that behaviour as far as the thickness increases. Since a specific base geometry has been used for the lattice pyramidal core, the comparison gives us the opportunity to investigate the unit cell strut angle giving the higher mechanical properties. The presented work considers a detailed FEM modelling of a standard 3-point bending test (ASTM C393/C393M Standard Practice). Detailed FEM modelling addresses to detailed discretization of cores by means of beam elements for lattice core and shell elements for honeycomb core. Facings, instead, have been modelled by using shell elements for both sandwich panels. On lattice core structure, elements of core and facings are directly connected, to better simulate the additive manufacturing process. Otherwise, an MPC-based constraint between facings and core has been used for honeycomb core structure. Both sandwich panels are entirely built of Aluminium alloy. Prior to compare the two models, the FEM sandwich panel model with lattice pyramidal core needs to be validated with 3-point bending test experimental results, in order to ensure a good reliability of the FEM approach and of the comparison. Furthermore, the analytical validation has been performed according to Allen's theory. The FEM analysis is linear static with an increasing midspan load ranging from 50N up to 500N.

Study on Hospital Environmental Causes Affected the Mother′s Comfort After Her Child Birth (산욕부 안위에 영향을 미치는 병원환경 요인에 관한 연구)

  • 변수자
    • Journal of Korean Academy of Nursing
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    • v.8 no.1
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    • pp.1-15
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    • 1978
  • The Purpose of this study is to examine closely the causes influenced upon the comfort and recovery of the woman delivered of a child in the hospital at the same time to understand environmental status of hospitals in order to promote mother's health recovery, and to improve hospital environment by emphasizing the meaning of environment and health before the medical staff and hospital administrative authority. In the method of servery of the research, 165 post paestum patients have been randomly selected who were accommodated and delivered their babies at OB(obstetric ) & GY (Gynecologic) unit the 7 general hospitals for the period of 6 December 1976 through 17 December 1976. As for the survey, it has been used of Questionnaire where we have 65 items in the respect of personal environment in the hospital such as trusting nurse, ability, reliability, kindness and etiquette of nurse and tile character of nurse the relationship with patients the other respect of physical environment included 9f temperature, moisture. air-ventilation lightening noise, cleanness. facilities, and the third realm being of mother's hearth ground to have the following conclusion 1. The feature of the collected personnel they are from OB or GY sects of from OB unit of the other 5 hospitals except the two general hospitals of the college or school Otherwise the rate of the patients to nurses would be 9 : 1. As for the nurses'ground it would be appeared of 20-25 years of age as the 76%. either 3 year course or 4 year course in the education would be each 50% and less than 2 year experience case would record as of 60 %. In the respect of hospital physical environmental status, there we have two hospitals without any thermometers, on the other han4 nowhere there's hygrometer, otherwise, the lightening is normal or over than normal As for the structure of noise protection the corridors're, generally speaking worse than rooms, nerver hueless, there's no ventilating system in the hospitals. The rooms'repainted in white and yellow, light green white, or green color. The patient's clothing were in green pink blue, light green or in white co for. There're not anything special in both decoration and equipments. Most of them used tall beds except in one hospital 2. To the extent of perception of patient's hatch 9round and hospital environment it is presented that they perceived nurse's ability in highest in total human variable, though perceived kindness or etiquette in the lowest otherwise, comparatively high in total average. 3. In the respect of physical environment it is highest perceived of lightening terms, otherwise, lowest perceived of air ventilation and total average became lowest than the one of the original record 4. To ages, in the respect of hatch ground rather old aged mother than the younger one has perceived that nurse would be trusting, in good service character, able, at the same time, liable, Otherwise, in physical environment regardless of age, they perceived lightening in high and remarkably lower in ventilation As a result of the examination of the difference in hospital environment to each age it is appeared of statistical difference at 5% level of ability in the personal environment otherwise little difference as for physical environment 5. In the respect of perceiving level to educational standard it is highly perceived of personal environment for higher ranking group rather than lower group in the educational standard. In case of physical environment it is highly perceived for lower level group rather than higher level group in educational background. The variables which have statistical significance at 5% level are from trusting kindness, etiquette and total kindness, etiquette and total all significance at 5% level are from trusting, kindness, etiquette and total human environment variable in personal environment, otherwise, there's little difference in the physical environment. 6. The perceiving level due to times of admission and accommodation at the hospital would be cleared out as gradual higher perception both physical and personal environment in the hospital. At 5% significant level of the ventilation condition in physical environmental variable it is presented of meaningful difference otherwise, there we have little difference both in Personal variable and other one. 7. In accordance with living standard, the perception degree of personal environment in tee hospital would be inclined to increase to higher living standard on the other hand, in case of the physical environment, the perception level world increase to lower living standard At 5 % level, the trustuariable and total scores in the personal eicuironmectal variable there appeared a meaningful/ significant difference otherwise, there presented little difference both in physical environmental and other variable to the living standard 8. Pertaining to family unit, the mother of an independent family unit perceived highly in all respect of the personal and the physical environment in the hospital rather than the woman of succeeding family unit. At 5 % level there appeared a difference in the respect of kindness and etiquette both in personal environment variable, on the other hand, there hardly marked a difference between other variable and physical environmental one. 9. The degree of perception to comforting level has little connection with a statistical difference the age, educational level hospital admitting times, living standard or family unit. 10. The most effective variable to mother's comforting level will be nurse's ability, reliability, trusting manner, and total physical environment variable in order.

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The Reduction ways of Medicine Material Costs of Nuclear Medicine In Vitro (핵의학 체외검사의 진료재료비용 절감 방안)

  • Song, Hun-Kang;Seo, Jung-Mi;Yang, Joon-Ho;Kim, Eun-Jung;Kim, Chang-Ho
    • The Korean Journal of Nuclear Medicine Technology
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    • v.15 no.2
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    • pp.111-115
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    • 2011
  • Purpose: In vitro uses dose response curve with 6 to 7 standard concentrations in every examination to analyze examination results and this use of dose response curve comprises a large portion of the consumption of medicine material. At this present, some ones of in-hospital examination items have shown mostly low result of distribution in the analyzed features and these examinations have been judged that it would be unnecessary to use the last standard concentration. Hence, this study selects those examination items showing low result of distribution and reviews the cases contributed to less consumption of medicine material and revenue growth of hospital by reduction of medicine material used in the place of the last standard concentration. Materials and Methods: The study was made targeting 11 examination items out of total 43 items of the in-hospital examination and since these examination items were mostly low in the features as the examination results of patients or the examination results were distributed to show lower concentration than the previous last standard concentration, it carried out the examination without using the last standard concentration, which could generate the effect to reduce medicine material (examination tube) used in the last standard concentration as many as the number of examination carried out. For this, it examined the number of medicine material reduction by month during the period from July, 2009 to February, 2011 and estimated the reduction amount of medicine material calculated the number of reduction by the unit cost of medicine material as well as the profit generated by the reduced medicine material to use for the medicine material of patient examination. Results: The total number of medicine material reduced during the period from July, 2009 to February, 2011 was 3,131 pieces, which had the effect to reduce the medicine material equivalent to about 31 kits of reagent. To calculate this by the unit cost of the medicine material, it analyzed to reduce about 6.4 million won of medicine material cost. Also the reduced medicine materials were used for medicine materials of patient examination and this was analyzed to generate about 13.75 million won of profit based on the ABC cost accounting. Conclusion: It showed no problem in the analysis of examination result even without using the last standard concentration regarding those examination items with low distribution of the patient examination result. For these examination items, it was able to reduce medicine material used for the last standard as many as the number of examination carried out. Also, the adjustment of concentration range was found to have no problem in the reliability of examination result. Therefore, this case will be applicable in those occasions of when the analysis of patient examination result is mostly distributed at the lower level or when an examination with the distribution of patient results in the range of lower concentration than the previous last standard concentration is carried out and this is considered to increase the efficiency in the use of medicine material in vitro as well as contribute to the profit of hospitals.

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