• 한국간호교육학회지
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• 제21권2호
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• pp.215-226
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• 2015

Purpose: This study aimed to develop a self-assessment tool to evaluate program outcomes of nursing students in Korean nursing undergraduate education. Methods: The instrument development process consisted of literature review, focus group interviews, and item validation. A total of 117 items were analyzed through content validity testing. Data was gathered from 302 nursing students in Korea and analyzed using SPSS 21.0. Results: To construct validity, principal component analysis and Varimax rotation were used, and 12 factors, with a cumulative explanatory variance of 69.16%, were determined from 79 items. For internal consistency and reliability, Cronbach's ${\alpha}$ was .91. The half-split reliability results were .84 and .85, and the ROC curve showed an optimal cutpoint at 227. A five-point Likert scale was used for scoring. Conclusion: This instrument was found to have fair validity and reliability as a self-assessment tool for nursing student learning outcomes. Therefore, it can be used to evaluate program outcomes indirectly in nursing schools.

• 한국안전학회지
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• 제12권4호
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• pp.143-152
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• 1997

Probabilistic Safety Assessment(PSA) is an engineering analysis of the possible contributors to the risk from a nuclear power plant. It consist of three phases named as Level 1, 2 and 3. Level 1 PSA mainly focused in this paper is the phase of system analysis which includes the development of accident scenarios and the frequency estimation of each scenario. It covers also the system reliability analysis, component data analysis, and human reliability analysis. PSA have become a standard tool in safety evaluation of nuclear power plants. The main benefit of PSA is to provide insights into plant design, performance and environmental impacts, including the identification of dominant risk contributors and the comparison of options for reducing risk.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.713-720
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• 2008

This article deals with a case study on determining the replacement interval for the extraction motor in KTX. The reliability is analysed with the field data from 42 months. The effect of the replacement interval on service reliability, availability, safety and lifecycle cost are evaluated through simulation which is done by the commercial tool, Availability Workbench AvSim Module. As the results of the analyses, a new replacement interval is presented to reduce the lifecycle cost while service reliability, safety and availability are satisfactory.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.326-327
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• 2011

Failure rate serves as a pivotal role in reliability study. When the system operates, failure datum of the system reflects the actual operating environment. Therefore, when we estimate the system's with the component failure data, we can find the more exact failure rate that reflected the system's operating environment. In this paper, we use the components' fault data and find out failure rate.

• 한국안광학회지
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• 제13권2호
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• pp.29-36
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• 2008

목적: 본 연구는 자동굴절검사기를 사용하여 측정한 값을 자각적굴절검사값과 비교하여 그 정확도와 신뢰성을 분석하고자 하였다. 방법: 99명 198안을 대상으로 조절마비제를 투여하지 않고 굴절검사를 실시하였으며, 자각적굴 절검사와 자동굴절검사기로 측정된 각각의 굴절력을 분석하여 신뢰도와 정확도를 평가하였다. 또한 Fourier analysis 를 사용하여 자동굴절검사기의 정확도를 분석하였다. 결과: 자동굴절검사기의 신뢰도 계수는 우안의 경우 구면굴절력에서 0.993, 난시굴절력은 0.974, 난시축은 0.925로 나타났으며, 좌안은 구면굴절력의 신뢰도 계수가 0.991, 난시 굴절력은 0.948, 난시축은 0.886으로 나타났다. Fourier analysis에 의해 자각적굴절검사와 비교하여 $J_{0}$ component에서 통계적으로 유의미한 차이가 없었으며(p>0.05), 자각적굴절검사와 비교하여 $J_{45}$component의 굴절력 차이 값은 -0.019와 -0.164로 나타났다. 결론: 본 연구에서 사용된 자동굴절검사기는 큰 오차 값을 가지지 않고 굴절력을 측정하는데 유용하게 사용될 수 있을 것으로 판단된다.

• 지역사회간호학회지
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• 제31권2호
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• pp.130-142
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• 2020

Purpose: The purpose of this study was to verify the validity and reliability of the Korean version of the Pain in Older Adults Knowledge Survey (K-POAKS) to assess knowledge of pain in older adults including people with dementia for use in long-term care hospital nurses. Methods: Survey data were collected from a convenience sample of 179 nurses who have worked in long-term care hospitals in B, D and U cities. The Kuder-Richardson Formula 20 for internal consistency for test reliability was conducted. The content, criterion-related and construct validity were evaluated using SPSS/WIN 22.0. Results: The KR 20 was .75 and Content Validity Ratio (CVR) was a range of 0.84~1.00. The criterion-related validity was positively correlated with attitudes (r=.28, p<.001) and performance (r=.21, p=.004). The construct validity of K-POAKS was analyzed by conducting the principal component method using the exploratory factor analysis varimax rotation, and seven factors were derived above the eigenvalue of 1.0. The seven factors explained 58.5% of the total variation. Conclusion: The Korean version of the POAKS showed satisfactory internal reliability, content validity, criterion-related validity and construct validity. These results suggest that the K-POAKS could be used as a suitable tool to measure the knowledge of the aged people's pain, including that of dementia patients for long-term care hospital nurses.

• 대한간호학회지
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• 제43권1호
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• pp.59-68
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• 2013

Purpose: This study was done to develop the self-report Mother-Preschool Child Interaction Scale (MPIS) for mothers of preschool children. Methods: The scale was based on items derived from literature review and in-depth interviews. A methodological study was used to check reliability and validity and participants were 334 mothers of preschool children enrolled in kindergarten or nursery. Data were analyzed using principal component factor analysis for construct validity, t-test for contrasted group validity, Pearson correlation for criterion related validity and test-retest reliability and Cronbach's ${\alpha}$ for reliability. Results: In the final MPIS 34 items identified through factor analysis were included, 6 constructs were derived, and explanatory power was 64.2%. Items on the MPIS were verified through correlation with the interaction observation scale of Kim & Mahoney and MPIS. Results were significant as mothers in the normal group exhibited MPIS scores that were significantly higher than those of mothers in the depressed group. Reliability of MPIS was .96 and test-retest reliability was .92. Conclusion: MPIS has the advantage of being easy to use, economical, and useful. Consequently, it is expected to be used as a screening tool for promptly and simply identifying the mother-preschool child interaction in diverse nursing practice and research.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제12권10호
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• pp.309-318
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• 2023

최근 세계 각국은 온실가스 배출을 규제하기 위해 전과정평가(LCA, Life Cycle Assessment)를 도입하려는 움직임을 보이고 있다. 전기차 전과정평가는 차량의 전체 수명주기에 걸쳐 발생하는 온실가스 배출량을 측정하고 평가하는 수단이다. 전과정평가 결과의 신뢰성을 높이기 위해서는 전기차 부품별로 신뢰성 있는 데이터가 필요하다. 이를 위해 최근 블록체인 기술을 적용한 전과정평가 모델에 대한 연구들이 수행되었다. 그러나 기존 연구들은 주요 제품 정보들이 다른 참여자들에게 그대로 노출되어 프라이버서 보호가 되지 않는 문제가 있고 부품데이터 정보가 업데이트될 때마다 트랜잭션 형태로 블록체인 원장에 기록해야 해서 비효율적이다. 따라서 본 논문에서는 효율적으로 전기차 차량부품 데이터를 수집하고 유효성을 검증하기 위해 전과정평가를 위한 DID 기반의 데이터수집 모델을 제안한다. 제안하는 모델은 수집된 데이터의 유효성과 무결성을 보장하며 블록체인 원장에는 사용자 인증 정보만 공유되어 데이터의 무분별한 노출을 방지하고 데이터의 출처를 효율적으로 검증 및 업데이트할 수 있다.

• 한국농공학회지
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• 제37권6호
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• pp.103-111
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• 1995

Drought index calculation based on the principal hydrological parameters, such as rainfall and reservoir storage, can estimate the duration and intensity of drought in irrigation reservoirs. It is difficult to build up a drought criteria since the conditions change variously by the reliability of rainfall. Because of the increasing water demands, it is urgent to prepare a generalized positive countermeasure to overcome drought. Water demands can at calculated but the estimation of drought characteristics, and the effective water management method can be established. The purpose of this study is to obtain a drought index and build up a data-base on the reservoir basins for establishing the fundamental hydrological data-base. This Index can observe the behavior of the WSI(Water Supply Index) and the component indices. The results summarized through this study are as follows. 1. WSI value of zero does not correspond to 100% in average due to the skewness in the probability distributions. 2. WSI is not a linear index; that is, given change in terms of water volume or percentage of average does not result in a proportional change on the WSI scale. 3. WSI is not always between the reservoir and the rainfall index in magnitude. This is only true if the component indices are of opposite sign. If they are of the same sign, the SWSI will often have a mangitude greater than either of the component indices. This is easily understood, because the concurrence of extreme values of the same sign for the two components is rarer than the occurrence of extreme values for either of the two components individually.

• 감성과학
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• 제11권4호
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• pp.553-564
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• 2008

본 연구에서는 일반화가능도 이론을 이용하여 폴리그라프 검사에 사용된 관련 질문의 개수와 반복측정 횟수 (차트의 수), 채점자 수가 폴리그라프 검사의 신뢰도에 미치는 영향을 평가하였다. 검찰청에서 형사피의자를 대상으로 Backster ZCT를 사용한 폴리그라프 검사자료 중 31명의 폴리그라프 검사자료를 표본추출하였으며, 31명의 검사자료를 13명의 채점자가 수치적 채점방법을 이용하여 채점한 점수에 대하여 일반화가능도 이론을 적용하여 분석하였다. 분석결과, 피검사자의 변량성분이 43.97%로 가장 컸으며, 다음으로 잔여오차변량성분이 16.84%, 피검사자와 반복측정 횟수의 상호작용오차변량성분이 12.17%, 피검사자와 반복측정 횟수, 관련 질문 개수의 삼원상호작용오차변량성분이 10.31%였으며, 나머지 변량성분은 모두 7% 미만이었다. 관련 질문의 개수와 반복측정 횟수, 채점자의 수에 따른 일반화가능도 계수를 산출한 결과, 바람직한 일반화가능도 계수인 0.80 이상을 보이는 조건은 관련 질문 2개 이상과 반복측정 3회 이상, 채점자 2명 이상의 조합인 것으로 나타났다.