• 근관절건강학회지
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• 제25권3호
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• pp.187-195
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• 2018

Purpose: This study was conducted to develop a video education program for spinal surgery patients and to investigate the effect of the program on patients' uncertainty and educational satisfaction. Methods: This study employed a nonequivalent control group pretest-posttest design. The participants were 54 patients who had undergone spinal surgery in Busan from February to May 2017. The video education program was provided to the experimental group (n=28). The program consisted of providing existing leaflets to patients and repeatedly showing patients educational videos during their hospitalization. Leaflets were also provided to the control group (n=26) as part of traditional care. Patients' reported levels of uncertainty and educational satisfaction were measured. Data were analyzed using the chi-squared test, independent t-test, Mann-Whitney U test, and covariance analysis. Results: A significant difference was observed between the groups in uncertainty pre-post changes (U=239.50, p=.030). With the education variable controlled, there were significant differences between the groups in the educational satisfaction posttest (F=19.79, p<.001). Conclusion: The program was effective in reducing uncertainty and in enhancing educational satisfaction. Therefore, the video education program may be helpful for improving patient satisfaction and outcomes in various clinical fields.

• 국제강구조저널
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• 제18권5호
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• pp.1508-1524
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• 2018

Hysteretic energy dissipating devices (HEDDs) have been increasingly applied to building construction to improve the seismic performance. The seismic responses of such damped structures are significantly affected by HEDD's structural properties. An accurate investigation on the propagation of HEDD's structural properties is required for reasonable evaluation of the seismic performance of a structure. This study aims to develop simplified methods that can estimate the collective uncertainty-propagation to the seismic response of damped structures employing HEDDs. To achieve this, three- and six-story steel moment-resisting frames were selected and the propagations of the individual HEDD's property-uncertainties were evaluated when they are subjected to various levels of seismic demand. Based on the result of individual uncertainty-propagations, a simplified method is proposed to evaluate the variation of seismic response collectively propagated by HEDD's property-uncertainties and is verified by comparing with the exact collective uncertainty-propagation calculated using the Monte Carlo simulation method. The proposed method, called as a modified SRSS method in this study, is established from a conventional square root of the sum of the squares (SRSS) method with the relative contributions of the individual HEDD's property-uncertainty propagations. This study shows that the modified SRSS method provides a better estimation than the conventional SRSS method and can significantly reduce computational time with reasonable accuracy compared with the Monte Carlo simulation method.

• 산경연구논집
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• 제13권9호
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• pp.11-26
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• 2022

Purpose: Manufacturers rely on interfirm governance mechanisms to reduce the risks inherent in uncertain environments; however, it is unclear which governance mechanisms are developed to manage relationships with suppliers. This study sought to enhance knowledge of how environmental uncertainty affects interfirm governance mechanisms under conditions reflecting varying levels of structural holes. To this end, the study investigated the relationships between manufacturers and major first-tier and sub-suppliers. In particular, the moderating effect of structural holes is examined. Research design, data and methodology: A questionnaire survey was conducted with a major first-tier supplier of a Korean engineering firm. Proposed hypotheses were tested using structural equation modeling. Results: The results show that while the relationship between environmental uncertainty and unilateral governance is positive but statistically insignificant, with bilateral governance is negative and statistically significant. The study also demonstrates that when structural holes are considered, the effects between environmental uncertainty and governance mechanisms are attenuated. Conclusions: This study suggests some theoretical and managerial contributions between exchange partners, especially, the results suggest that structural holes have a critical competitive advantage in uncertain environments. Therefore, manufacturers should carefully consider how they deal with environmental uncertainty when they make a business decision under structural holes situations.

• Nuclear Engineering and Technology
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• 제55권5호
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• pp.1630-1643
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• 2023

The correct situation awareness (SA) of operators is important for managing nuclear power plants (NPPs), particularly in accident-related situations. Among the three levels of SA suggested by Ensley, Level 3 SA (i.e., projection of the future status of the situation) is challenging because of the complexity of NPPs as well as the uncertainty of accidents. Hence, several prediction methods using artificial intelligence techniques have been proposed to assist operators in accident prediction. However, these methods only predict short-term plant status (e.g., the status after a few minutes) and do not provide information regarding the uncertainty associated with the prediction. This paper proposes an algorithm that can predict the multivariate and long-term behavior of plant parameters for 2 h with 120 steps and provide the uncertainty of the prediction. The algorithm applies bidirectional long short-term memory and an attention mechanism, which enable the algorithm to predict the precise long-term trends of the parameters with high prediction accuracy. A conditional variational autoencoder was used to provide uncertainty information about the network prediction. The algorithm was trained, optimized, and validated using a compact nuclear simulator for a Westinghouse 900 MWe NPP.

• Structural Engineering and Mechanics
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• 제46권4호
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• pp.447-458
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• 2013

Splitting tensile strength (STS) is a respectable mechanical property reflecting ability of the concrete. The STS of concrete is mainly related to compressive strength (CS), water/binder (W/B) ratio and concrete age. In this study, the assessment of STS is made by a novel uncertainty-oriented method which uses least square optimization and then predicts STS of concrete by uncertain (fuzzy) numbers. The approximation method addresses a novel integration of fuzzy set theory and multivariate statistics. The numerical examples showed that the method is applicable with relatively limited data. In addition, the prediction of uncertainty at various levels of possibility can be described. In conclusion, the uncertainty-oriented interval analysis can be suggested an effective tool for appraising the uncertainties in concrete technology.

• 한국산학기술학회논문지
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• 제17권12호
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• pp.53-61
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• 2016

본 연구는 물류관리시스템 성과를 극대화하기 위해 외부환경과 물류정보시스템 간의 적합성이 물류성과에 직접적인 영향을 미치는 과정에서 기업의 규모에 따라 물류성과는 차별적인 영향을 받고 있는가를 연구의 목적으로 한다. 실증분석결과, 먼저 환경불확실성과 물류정보시스템 간의 적합성의 차이에 따라 물류성과가 차이가 있는가에 대한 실증결과에 의하면 적합성이 높은 그룹이 낮은 그룹보다 물류성과가 높다는 연구결과를 보이고 있다. 둘째, 환경불확실성과 물류정보시스템 간의 적합성에 따른 물류성과 차이가 기업규모에 따라 차이가 있는가에 대한 연구결과를 보면, 기업의 규모에 따라 물류성과는 차이가 있다는 연구결과를 보이고 있다. 즉 이러한 연구결과는 외부환경과 물류정보시스템 간의 적합성을 통한 물류성과 향상의 달성은 규모의 경제 논리에 따라 기업규모가 클수록 물류성과가 효율적이라는 선행연구 결과에 의해서 기업의 규모에 따라 차별적으로 물류성과 향상을 꾀할 수 있다는 연구결과이다. 본 연구결과는 전략의 수립 실행만을 초점으로 하는 물류경영실무에 대해서도 기업의 규모에 대한 명시적인 고려가 필요함을 시사해 준다. 또한 기업의 성과함의를 분석하기 위해서 전략 실행의 문제를 배제하고 있는 물류경영실무에 대해서도 기업규모에 따른 적절한 물류정보시스템의 선택에 관한 문제를 고려할 필요가 있음을 제시하는 연구결과이다.

• 한국정보시스템학회지:정보시스템연구
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• 제29권2호
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• pp.1-26
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• 2020

Purpose This study empirically investigates the impact of information technology(IT) investments on the financial and non-financial performance of a manufacturing firm. We examined the interaction effects of IT investments and strategic applications levels of information systems(IS). This study also demonstrated the three-way interaction effects of IT investments, levels of IS strategic applications, and perceived environmental uncertainty(PEU). Design/methodology/approach For this study, empirical data were collected from 98 manufacturing firms with the structured questionnaires. The data were analyzed with multiple regression models, and partial derivatives were utilized to identify the directions of the impact. Findings From the empirical results, it was found that when both the levels of IS strategic applications and the degrees of IT investments are high, the ratios of the costs of goods sold to total sales(RCGS) and the labor costs to total sales(RLCS) are decreased, as it were, the performance of a firm is improved. However, it was observed that when the levels of strategic IS are low, the high degrees of IT investments do not contribute to the improvement of a performance. The results showed that when the levels of strategic IS are high, the high degrees of IT investments incur the high RSAE not low RSAE. When PEU is considered, the empirical results showed that under the low degrees of PEU, the IT investments under high levels of strategic IS applications (strategic IT investments) improve the performance, as it were, low RCGS, and high degrees of perceived financial and non-financial performance. However, under high PEU, it was observed that high degrees of strategic IT investments do not increase the performance. When PEU is high, the strategic IT investments reduce RSAE, and under low PEU, RSAE is increased.

• 보건의료산업학회지
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• 제9권4호
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• pp.105-117
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• 2015

Objectives : The aim of this study was to investigate the relationship among uncertainty, self-care agency and physiological index in acute myocardial infarction (AMI) patients who underwent primary percutaneous coronary intervention. Methods : A total of 196 patients who were admitted C National University Hospital from Oct 2014 to Jun 2015 participated in the study. Data were collected with a questionnaire, and the blood pressure, HgA1C, and lipid profile levels of the patients were acquired. Results : The mean age was 69.2 (${\pm}13.0$) years, and 74 % of the patients were men. The mean score for uncertainty in illness was 48.7 (${\pm}8.8$). The mean score for self-care agency was 73.3 (${\pm}13.4$). Self-care agency showed a negative correlation with uncertainty (r=-.579, p<.001), age (r=-.732, p<.001), systolic blood pressure (r=-.265, p=.001) and HgA1C (r=-.293, p<.001). Conclusions : The results of this study can be used to develop a nursing program that prevents AMI and to improve the clinical prognosis of AMI patients.

• 국제강구조저널
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• 제18권5호
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• pp.1607-1616
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• 2018

Quantitatively modeling and propagating all sources of uncertainty stand at the core of seismic fragility assessment of structures. This paper investigates the effects of various sources of uncertainty on seismic responses and seismic fragility estimates of single-layer reticulated domes. Sensitivity analyses are performed to examine the sensitivity of typical seismic responses to uncertainties in structural modeling parameters, and the results suggest that the variability in structural damping, yielding strength, steel ultimate strain, dead load and snow load has significant effects on the seismic responses, and these five parameters should be taken as random variables in the seismic fragility assessment. Based on this, fragility estimates and fragility curves incorporating different levels of uncertainty are obtained on the basis of the results of incremental dynamic analyses on the corresponding set of 40 sample models generated by Latin Hypercube Sampling method. The comparisons of these fragility curves illustrate that, the inclusion of only ground motion uncertainty is inappropriate and inadequate, and the appropriate way is incorporating the variability in the five identified structural modeling parameters as well into the seismic fragility assessment of single-layer reticulated domes.

• 기본간호학회지
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• 제13권3호
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• pp.428-436
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• 2006

Purpose: To investigate the levels of uncertainty and anxiety at admission and discharge to the isolation unit for patients undergoing hematopoietic stem cell transplantation (HSCT). Method: The data were collected from 60 patients who were admitted to the department of HSCT. Uncertainty and anxiety were assessed using the Mishel Uncertainty in Illness Scale (MUIS) and Anxiety Inventory (STAI). Collected data were analyzed using the SAS program. Results: The mean score for anxiety at admission was 2.20, and at discharge 2.10. The mean score for uncertainty at admission was 2.19, and at discharge 2.07. The anxiety at admission the group with physical discomfort was higher than that of group without physical discomfort. A positive relationship was found between anxiety and uncertainty at admission and at discharge. The major variables were expectation for cure and physical discomfort, explaining 25.87% of the anxiety at admission. The major variable was expectation for cure, explaining 20.94% of the uncertainty at admission. Conclusion: Front the above results, it can be concluded that support and consideration are required to reduce anxiety of the inpatient in single room.