• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1993년도 가을 학술발표회논문집
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• pp.224-231
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• 1993

This paper is concerned with the influence of changes in stochastic parameters of the important resistance variables such as the strength modelling parameter and material and geometric properties, on the system safety level of TLP structures. The effect of parameters governing the post-ultimate behaviour is also addressed. An extended incremental load method is employed for the present study, which has been successfully applied to the system reliability analysis of continuous structures. The Hutton Field TLP and its one variant called herein TLP-B, are chosen as TLP models in this paper. The results of several parameteric studies lead to useful conclusions relating to the importance of reducing uncertainties in strength formulae and relating the importance of component post-ultimate behaviour to the systems reliability of such structures.

• Structural Engineering and Mechanics
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• 제3권3호
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• pp.201-213
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• 1995

At present Level 2 and importance sampling methods are the main tools used to estimate reliability of structural systems. But sometimes application of these techniques to realistic problems involves certain difficulties. In order to overcome the difficulties it is suggested to use Monte Carlo simulation in combination with two other techniques-extreme value and tail entropy approximations; an appropriate Pearson's curve is fit to represent simulation results. On the basis of this approach an algorithm and computer program for structural reliability estimation are developed. A number of specially chosen numerical examples are considered with the aim of checking the accuracy of the approach and comparing it with the Level 2 and importance sampling methods. The field of application of the approach is revealed.

• 한국신뢰성학회지:신뢰성응용연구
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• 제6권3호
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• pp.213-224
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• 2006

Social capital contains relational, structural and cognitive dimensions. This study regards social capital as diminishing factor in innovation resistance. Trust, structuring individual tie and vision sharing which are representatives of three dimensions of social capital diminish innovation resistance. So innovation becomes more successful.

• Journal of applied mathematics & informatics
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• 제40권5_6호
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• pp.925-931
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• 2022

In this article, we compare the reliability and the hazard function between a baseline distribution and the corresponding transmuted-G distribution. Some examples based on existing transmuted-G distributions in literature are used. Three tests of parameter significance are utilized to test the importance of a transmuted-G distribution over the baseline distribution, and real data is used in an application of the inference about the importance of transmuted-G distributions.

• 한국정밀공학회지
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• 제25권8호
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• pp.9-16
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• 2008

• Communications for Statistical Applications and Methods
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• 제16권6호
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• pp.937-943
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• 2009

가변용량 네트워크에서의 각 링크는 서로 독립이며 용량한계가 설정되어 있다. 각 링크는 각동하거나 작동불능의 두 상태로 구별되며 작동불능 상태의 링크는 유량을 통과시킬 수 없다. 주어진 네트워크는 미리 설정된 기정용량이상의 최대 전송용량이 가능할 때 작동된다고 한다. 본 논문에서는 가변용량 네트워크에서 기정용량이 주어졌을 때의 각 링크의 용량에 관한 구조적 중요도와 신뢰성 중요도를 정의하고, 네트워크 성능지수에 관련한 링크 중요도 척도를 제시한다. 또한 다양한 구조의 네트워크에서의 수치예제를 통하여 제시된 척도를 비교분석한다.

• 한국인터넷방송통신학회논문지
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• 제9권3호
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• pp.209-215
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• 2009

오늘날 산업의 융 복합화로 임베디드 소프트웨어의 비중이 높아져 가고 있다. 그 결과 임베디드 소프트웨어 개발이 필요했고 많은 업체 및 제품이 활용되었다. 임베디드 소프트웨어는 무기와 의료장비 등 사람의 생명에 큰 영향을 미치는 곳에 사용되기 때문에 신뢰성이 중요하다. 일반적인 소프트웨어 신뢰성 평가에 대해서는 품질관련 표준인 ISO/IEC 9126, ISO/IEC 12119 등에서 언급하고 있다. 하지만 임베디드 소프트웨어의 특성을 고려하지 않고 있기 때문에 신뢰성 평가에 적용하기에는 미흡하다. 이를 해결하기 위해 우리는 ISO/IEC 9126, ISO/IEC 12119, 14598에서 소프트웨어 신뢰성 평가항목들을 추출하고, 추출된 항목들을 임베디드 소프트웨어의 특성을 고려한 체크리스트를 제안한다.

• International Journal of Reliability and Applications
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• 제3권2호
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• pp.81-90
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• 2002

The importance of the reliability of software is growing more and more as more complicated digital computer systems are used for real-time control applications. To provide more reliable software, the testing period should be long enough, but not unnecessarily too long. In this study, we suggest a simple but effective stopping rule which can provide just proper amount of testing time. We take unique features of software into consideration and adopt non-homogeneous Poisson process model and Bayesian approach. A numerical example is given to demonstrate the validity of our stopping rule.

• 한국환경복원기술학회지
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• 제23권2호
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• pp.17-31
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• 2020

In the field of environmental landscape architecture, the internet medium is used as an effective communication tool not only in the private level but also in the policy level. Recently, the active utilization of mobile web service is emphasized as the time changes, but there is not much improvement or advance in services due to lack of relevant studies. Therefore, this study is intended to provide basic data needed for improvement and advance by researching the quality of mobile web service among multichannel services provided in environmental landscape architecture related internet media. The model for measuring service quality is SERVQUAL, which was verified in the study of Choi(2015), Choi and Koo(2016), and the final valid samples are total 230. First, the subjects were analyzed as the representative media that are possible to acquire comprehensive knowledge related to environmental landscape architecture. Second, the highest importance level in each subsection was 'protection and security maintenance of customer information' followed by 'Reliability about accurate information supply'. Regarding performance level, 'Reliability about accurate information supply' and 'professional knowledge to communicate with users' are highly evaluated. Third, regarding Importance-Performance Analysis(IPA), the first priority management should is 'Tangibles', and the next are 'Responsibility' and 'Empathy'. The ones for maintenance of the status quo are 'Reliability' and 'Assurance', and there is none for effort reduction. Meanwhile, regarding the importance of each factor and difference in the quality of PC web service and mobile web service studied before, the biggest difference is in 'Tangibles', followed by 'Assurance', 'Empathy', 'Responsibility' and 'Reliability'. It is suggested that the revitalization of Landscape information science(LB1106) presented in the National Science&Technology Standard Classification System is needed. In the future, it is necessary to research the change trend on users' response through continuous evaluation of improved mobile web service.

• 대한공업교육학회지
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• 제30권2호
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• pp.82-103
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• 2005

The purpose of this study was to develop and present the accreditation criteria for engineering technology education programs in junior colleges. Research methods used in this study were review of related literature, experts discussion, and Delphi technique. Especially, Delphi technique was the major research method of this study. The Delphi surveys were taken for about seven weeks and three rounds at a higher level of expert participation. Major results of the study were as follows: 1. It proved that thirty six of total forty items had the content validity as the accreditation criteria of engineering technology education programs for junior colleges. CVR(Content Validity Ratio) of four items were below .33 and eliminated four items from the final accreditation criteria. 2. It proved that total Cronbach ${\alpha}$ was very high .9142 and reliability was very high all over items. It proved that six items made worse reliability, therefore it was desirable to exclude six items for increase of reliability. But the final accreditation criteria included six items, because they had a high validity as well as increasing rate of Cronbach ${\alpha}$ was very low with the exception of them. 3. Items of high importance were drawn out through analysis of importance. It proved that thirty of total forty items were more than 4.00 average in importance and ten items were less than average. 4. In conclusion, the final accreditation criteria were developed and presented through such analysis of validity, reliability and importance. The final accreditation criteria for engineering technology education programs in junior colleges were composed of seven domains of educational objectives, learning outcomes, curriculum, staff, facilities, institutional support, and student assessment.