• 한국의류학회지
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• 제34권6호
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• pp.913-927
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• 2010

This study investigates the influence of Likert scale formats such as the number of response categories and the inclusion of a mid-point from a methodological point of view using instruments that measure a fashionmarketing-related subject. Using a self-administered questionnaire, 201 respondents rated their economic clothing shopping orientation on three formats of scales that differed only in the number of response categories (ranging from 5 to 7) from February 8 to February 12, 2010. Descriptive statistics, Spearman's rank order correlation, t-test, exploratory factor analysis, confirmatory factor analysis, Pearson's correlation, and Cronbach's alpha were used in the analysis. The results are as follows. First, three scale formats were generally suitable for use due to validity and reliability. Second, the response results varied with the number of categories and the inclusion of a mid-point, although the differences were statistically insignificant (with only a few cases that differed). Third, construct validity was more secure in scales with fewer categories, whereas convergent and discriminant validity was generally good in all scale formats. Fourth, reliability coefficients were higher in scales with more categories. Fifth, the number of categories was of greater importance to instrument design than the inclusion of a mid-point. Implications for appropriate scale designs are suggested in this study.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제18권1호
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• pp.75-87
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• 2014

It is central to use a scale to measure a person's level of a construct in mathematics education research. This article explains a practical process through which a researcher rapidly can develop an instrument to measure the construct. The process includes research questioning, reviewing the literature, framing a background theory, treating the data, and reviewing the instrument. The statistical treatment of data includes normality analysis, item-total correlation analysis, reliability analysis, and factor analysis. A virtual example is given for better understanding of the process.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.452-454
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• 2003

$SF_6$ gas has been increasingly used as the insulating and arc-suppressing medium in switchgears which are used as the protection devices of power system. Nowadays, most of power companies adopted the $SF_6$ gas-type load break switch for increasing the reliability of distribution network by its superior durability against external environmental condition, in substitution for air-type and oil-type switches. But, it is important to establish the general estimation process for the testing and estimation for long-term reliability. Accordingly, this paper presents the reliability testing method for $SF_6$ gas load break switch which is based on the analysis of the failure mode and the statistics.

• 품질경영학회지
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• 제22권1호
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• pp.205-213
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• 1994

We construct a new lower bound of Cramer-Rao type for the median-unbiased estimator in the presence a nuisance parameter. We also identify useful necessary and sufficient conditions for the attainability of the lower bound. Some applications including the analysis of censored reliability data are considered as examples.

• 한국콘텐츠학회논문지
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• 제16권1호
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• pp.167-178
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• 2016

이 연구의 목적은 연기전공대학생들의 수업을 통해 참여동기, 연기표현성, 심리적 행복감간의 어떠한 인과관계가 있는가를 연구하는 데에 목적이 있다. 연구목적을 위해 단순무선표집 방법을 사용하였으며 서울, 경기도에 소재한 대학에 재학 중인 연극, 연기전공 대학생들을 모집단으로 설정하고, 총 499부의 설문지가 분석에 사용되었다. 설문 문항은 사전검사를 통해 신뢰도와 타당도가 검증된 73개의 문항을 사용하였다. 자료처리방법은 IBM STATISTICS SPSS 22와 AMOS 22 통계패키지를 이용하였으며, 기술통계분석, 확인적요인분석, 신뢰도분석, 구조방정식 모형을 적용하여 분석하였다. 본 연구의 결론은 다음과 같다. 연기전공대학생의 수업 참여동기 중 내적동기와 외적동기는 연기표현성과 심리적 행복감의 모든 하위요인에 정적으로 유의한 영향을 미치며 무동기는 영향을 미치지 않았다. 연기표현성 중 개성과 표현충동은 심리적 행복감에 모두 영향을 미쳤으며 동작성은 영향을 미치지 않았다.

• 한국안전학회지
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• 제23권2호
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• pp.37-44
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• 2008

The safety assessment for facility industry is now being periodically performed. For the purpose of scientific safety management, QRA(Quantitative Risk Assessment) is also being performed, and reliability data of the facilities is essential to perform the assessment. Generally, the existing safety assessment is performed by using the values announced in other industry processes, which result in the drop of reliability. In order to solve this problem, there is an urgent need to establish reliability database for the facilities. The most appropriate method is to perform a direct reliability analysis towards the facilities undergoing safety assessment. In this study, in compliance with the assessment method and procedure of OREDA-2002 handbook, the facility reliability data are collected, which include the calendar time and operational time in terms of different facility items, the number of failures in terms of different failure mode, the mean, standard deviation, lower limit and upper limit of failure rate, and the failure rate. And the data process method for this special occasion is also proposed when the number of failure is 0.

• The Journal of Korean Physical Therapy
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• 제22권1호
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• pp.83-90
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• 2010

Purpose: This study aimed to determine the degree of job stress and self-esteem of physical therapists as well as the correlation between the two variables. Method: This study targeted 218 physical therapists of Busan City, and was carried out from July 16 to August 6, 2009 as survey research. A structured questionnaire referring to advance researches was used as a research tool. Job stress symptoms were measured one a 5 point scale, the higher the point total, the higher the job stress. Self-esteem was measured on a 4 point scale, the higher the point total, the lower the self-esteem. After data collection we determined descriptive statistics, and did reliability analysis, factor analysis, Spearman's correlation analysis, and regression analysis. Results: Reliability analysis indicated that reliability for the job stress questionnaire was 0.93 and for the self-esteem was 0.83. The average job stress score of physical therapists was 1.19 points which was not high. The average self-esteem score was 1.76 points, whichwas high. It appeared that the higher the self-esteem, the lower the job stress. Also, self-esteem had an influence on psychological symptoms among job stress factors. Conclusion: Job stress and self-esteem of physical therapists are well-correlated and influence each other. Accordingly, self-esteem can be used as a variable for adjusting job stress of physical therapists.

• 한국농공학회지
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• 제32권E호
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• pp.59-66
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• 1990

Abstract The formulation of the probabilistic finite element method was briefly reviewed. The method was implemented into a computer program for frame analysis which has the same analogy as finite element analysis. Another program for Monte Carlo simulation of finite element analysis was written. Two sample structures were assumed and analized. The characteristics of the second moment statistics obtained by the probabilistic finite element method was examined through numerical studies. The applicability and limitation of the method were also evaluated in comparison with the data generated by Monte Carlo simulation.

• 한국콘텐츠학회논문지
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• 제15권3호
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• pp.290-302
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• 2015

본 연구의 목적은 대학생들을 대상으로 수정된 스트레스 평가 도구(Revised Stress Appraisal Measure, RSAM)를 우리나라 실정에 맞게 번역하고, 타당도와 신뢰도를 검증하는 것이다. IBM SPSS Statistics 21과 AMOS 21 program을 이용하여 내적 일관성 신뢰도, 구성타당도, 준거타당도 검사를 하였다. 자료 수집은 G시와 C 지역 소재의 5개 대학교에 재학 중인 296명의 대학교 4학년 학생을 임의로 표출하였다. 한국어판 RSAM은 5개 요인으로 분류되었으며, 전체 변량은 68.4%를 설명하였다. 5개의 하위요인은 확증적 요인분석에 의해 타당성이 입증되었다(p<.001, Goodness of Fit Index, Adjusted Goodness of Fit Index, Normed Fit Index, Comparative Fit Index >.08, Root Mean Square Error of Approximation=.056). 준거타당도에서, 척도의 점수는 한국어판 Perceived Stress Scale (PSS)와 유의한 상관관계가 있었다. 신뢰도 계수는 .73에서 .89까지였다. 한국어판 RSAM 은 구성타당도와 준거타당도, 그리고 내적 일관성 신뢰도에서 만족할 만한 것으로 나타났다. 따라서 본 도구는 한국 대학생들의 스트레스 평가를 측정하는데 적합한 도구가 될 수 있을 것이다.

• International Journal of Reliability and Applications
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• 제8권1호
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• pp.67-82
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• 2007

This paper deals with the effectiveness analysis of an engineering system, which has two units of different strengths in parallel and one unit as a cold standby unit. Failure times for all the units have negative exponential distribution whereas their repair times have general distribution. Single server caters the need for the system. The effectiveness analysis of the system is done by using regenerative point technique. The different measures of effectiveness such as mean sojourn time, mean time to system failure, availability, busy period, etc, are derived. Cost factors also taken into consideration.