• 한국치위생학회지
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• 제12권4호
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• pp.741-749
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• 2012

Objectives : High school students to measure fear of dental treatment, dental health care workers according to the level of reliability of this study is to determine the extent of terror was carried out. Methods : Located in Gwangju, 165 high school students were surveyed. SPSS windows ver. 11.0 by demographic characteristics and oral health characteristics of the frequency and percentage, and dental health care workers about the reliability of the Chi-square test, the general characteristics and oral health characteristics by dental fear of the t-test and one way ANOVA and were factors associated with dental fear of the stepwise multiple regression analysis was performed. General characteristics, except Cronbach-${\alpha}$ coefficient was 0.911. Results : According the general fear of Dental Treatment Fear Factor item 4, you'll feel the highest fear when you feel the muscle tension and the needle pricks your skin. The reliability of dental health care workers if the dentist lower the higher the grade, subjective oral health status is considered more reliable health was higher, the stronger the reliability of pain was significantly lower (p<0.05). Other care coordination include the reliability of sources of interest in subjective oral health history, no past experience in treating pain and increase the number of reliability was low (p<0.05), past experience and increase the number of pain during treatment the stronger the fear of more pain showed an increase (p<0.05). Conclusion : According the related factors about the fear of dental treatment, stimulus-response and fear of dental office have increased, the fear of dental treatment increase.

• 아태비즈니스연구
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• 제11권4호
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• pp.121-134
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• 2020

Purpose - The purpose of this study is to investigate consumer's satisfaction with the attractiveness, reliability, and professionalism that are characteristics of social influencers, and to investigate the impact of influencer characteristics on consumers' continuous use intention through satisfaction. Design/methodology/approach - A total of 293 questionnaires on independent samples were used for this study. Collected data were analyzed by SPSS 26.0 and AMOS 24.0 program and frequency analysis, reliability analysis, confirmatory factor analysis, correlation analysis and structural equation model analysis were performed. Findings - The findings demonstrated the followings: First, the attractiveness, reliability and professionalism of influencer had a positive effect on satisfaction. Second, the attractiveness and reliability of influencer had a positive effect on continuous use intention. However, professionalism did not have a significant impact. Third, user satisfaction with social media (channel of influence) had a positive effect on continuous use intention. Research implications or Originality - In doing so, this study was able to provide an in-depth understanding of the key characteristics of influencers and their roles, and contributed to ongoing research by providing suggestions for future studies.

• 한국신뢰성학회지:신뢰성응용연구
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• 제9권1호
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• pp.59-69
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• 2009

LEDs have rapidly replaced old light devices such as incandescent or fluorescent lamps, and have been widely applied in general lighting, signals, automobile, signs and others. Since LEDs are for both indoor and outdoor use, temperature and humidity inevitably affect its reliability. We explain the result of the degradation life test on LEDs, and guide to reliability analysis procedure. Analysis on reliability measures are performed by Weibull++6 program, and a common shape parameter of Weibull distribution on the LED is suggested. Also, we make a description of reliability analysis procedures for the degradation data using collected test data from degradation tests. Reliability analysis procedures are consisted of estimating degradation models and failure time, verifying of distribution and parameters of the distribution, and estimating of reliability measures. Finally, this paper suggests reliability analysis method for light characteristics on LEDs.

• 한국구조물진단유지관리공학회 논문집
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• 제3권4호
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• pp.139-144
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• 1999

Based on the recent developments of the reliability-based structural analysis and design as well as the extending knowledge on the probabiliistic characteristics of load and resistances, the probability based design criteria have been successfully developed for many standards. Since the probabilistic characteristics depend highly on the local load and resistances, it is recognized to develop the design criterion compatible with domestic requirements. The existing optimum design methods, which are generally based on the structural theory and certain engineering experience, do not realistically consider the uncertainties of load and resistances and the basic reliability concepts. This study is directed to propose a optimum design based Expected Total Cost Minimization on P.S.C Box Girder Bridge system which could possibly replace optimum design based traditional provisions of the current code, based on the Neldel-Mead Method reliability theory.

• 한국신뢰성학회지:신뢰성응용연구
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• 제17권3호
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• pp.207-212
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• 2017

Purpose: This article provides an efficient cushion molding method for improving reliability of the rotation driving system. Method: Allowable stress level for cushion is calculated by using physical characteristics of the rotation driving system. In addition, various test units are manufactured and used to conduct the rebound resilience, the burst pressure and the alternating load test. Results: Actual allowable stress level and test results of the rebound resilience, the burst pressure and the alternating load test are provided. Conclusion: The cushion manufactured by the compression molding method gives more preferable characteristics for improving the reliability of the rotation driving system.

• International Journal of Automotive Technology
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• 제4권3호
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• pp.135-140
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• 2003

In the deterministic optimization of a structural system, objective function, design constraints and design variables, are treated in a nonstatistical fashion. However, such deterministic engineering optimization tends to promote the structural system with lest reliability redundancy than obtained with conventional design procedures using the factor of safety. Consequently, deterministic optimized structures will usually have higher failure probabilities than unoptimized structures. Therefore, a balance must be developed between the satisfactions of the design requirements and the objectives of reducing manufacturing cost. This paper proposes the reliability-based design optimization (RBDO) technique, which enables the optimum design that considers confidence level for the vibration characteristics of structural system. Response surface method (RSM) is utilized to approximate the performance functions describing the system characteristics in the RBDO procedure. The proposed optimization technique is applied to the pillar section design considering natural frequencies of a vehicle structure.

• 산업경영시스템학회지
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• 제38권4호
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• pp.142-148
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• 2015

Due to advancements in technology and manufacturing capability, it is not uncommon that life tests yield no or few failures at low stress levels. In these situations it is difficult to analyse lifetime data and make meaningful inferences about product or system reliability. For some products or systems whose performance characteristics degrade over time, a failure is said to have occurred when a performance characteristic crosses a critical threshold. The measurements of the degradation characteristic contain much useful and credible information about product or system reliability. Degradation measurements of the performance characteristics of an unfailed unit at different times can directly relate reliability measures to physical characteristics. Reliability prediction based on physical performance measures can be an efficient and alternative method to estimate for some highly reliable parts or systems. If the degradation process and the distance between the last measurement and a specified threshold can be established, the remaining useful life is predicted in advance. In turn, this prediction leads to just in time maintenance decision to protect systems. In this paper, we describe techniques for mapping product or system which has degrading performance parameter to the associated classical reliability measures in the performance domain. This paper described a general modeling and analysis procedure for reliability prediction based on one dominant degradation performance characteristic considering pseudo degradation performance life trend model. This pseudo degradation trend model is based on probability modeling of a failure mechanism degradation trend and comparison of a projected distribution to pre-defined critical soft failure point in time or cycle.

• 한국항공우주학회지
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• 제37권6호
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• pp.595-601
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• 2009

높은 신뢰도를 요구하는 비행제어 시스템은 복잡한 중복구조로 구성된다. 이러한 중복 구조는 시스템의 내고장성(fault tolerant)을 향상시킬 수 있다. 따라서 시스템 설계자는 다양하게 구성될 수 있는 중복구조의 정량적 데이터를 바탕으로 적절한 구조를 선택할 수 있다. 본 논문에서는 중복구조의 특징을 분석하고 신뢰도 해석을 위해 필요한 수학적 모델을 정의하였다. 이렇게 정의된 해석 모델을 적용하여 Simulink 블록 기반의 Reliability Block Diagram 해석 도구를 구성하고, 상용으로 사용되고 있는 도구를 이용하여 분석도구의 타당성을 검증하였다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제1권1호
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• pp.9-15
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• 2001

This paper modelled the fail-safe control logic through the frequency coding input and designed the 3-out of-6 self checker using the error detect coding method of information redundancy. In addition, this paper also peformed the reliability parallel numeric analysis regarding single module between fail-safe. control logic module and TMR(Triple Modular Redundancy), therefore, we achieved the result that the fail-safe control logic increases a functional reliability because of decreasing system waste cost and functional overhead rather than the existing hardware redundancy method.

• 유통과학연구
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• 제12권9호
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• pp.53-63
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• 2014

Purpose - The rapid spread of SNS and increase of SNS users have heralded great changes in the tourism industry. Therefore, this study focused on how SNS characteristics- usefulness, convenience, interactivity, and intimacy - influence diffusivity, reliability and, consequently, user's preference for tourist attractions. Research design, data, and methodology - This study is designed not only to collect data with a questionnaire survey but also to test hypotheses with SEM by SPSS 18.0 and AMOS 18.0. Results - Usefulness, interactivity, and intimacy positively affect diffusivity, whereas convenience does not positively affect diffusivity. In addition, intimacy has a negative influence on reliability. However, diffusivity and reliability have positive impacts on the preference for tourist places. Conclusions - Certain characteristics of SNS facilitates the spreading of SNS tourist information. Usability and interactivity have positive impacts on the reliance of tourist information. Better communication can enhance the reliance of travel information. The influence of spreading tourist information has a positive influence on its reliance. Extension and reliance can have positive effects on the preference for tourist attractions.