• 간호행정학회지
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• 제7권1호
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• pp.145-163
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• 2001

The purpose of this research is to identify antecedent variables and outcome variables of the empowerment in clinical nurses, and to suggest managerial strategies for increasing their empowerment. Data were collected from October 12 to 18, 2000 through questionnarie taken by 566 nurses in 3 general hospitals. The 5 structured instruments were used for collecting the data : Spreitzer's Items Measuring Empowerment, Bass's Multifactor Leadership Questionnaire-1, Moorman's Equity of rewards scale, Mobley's turnover intention scale, and the Organizational Commitment Scale developed by Mowday, Porter & Steers. The data obtained were analyzed using frequency, percentage, mean, standard deviation, t-test, one-way ANOVA, Scheffe' test, Pearson's Correlation Coefficients, Factor Analysis, Cronbach's alpha Coefficients, Multiple Regression. The results were as follows; 1. Head nurse's transformational leadership showed an positive correlation with empowerment(r=.304, p=.00). Regression coefficient between transformational leadership and empowerment was significant(${\beta}=.326$, p=.00), However, there was no a correlation between equity of rewards and empowerment. 2. The general characteristics of nurses were significant differences with empowerment. As for position, age, working experience, and education background showed significant difference with empowerment(F=10.979, 11.224, 6.812, 5.411, p<.01). 3. Empowerment showed a positive correlation with organizational commitment and a negative correlation with turnover intention (r=.387, -.274, p=.00). Regression coefficient between empowerment and organization commitment was significant(${\beta}=.365$, p=.00). In conclusion, the more head nurse took the transformational leadership, the higher nurses perceived empowerment. The higher their empowerment level, the higher organizational commitment they perceived. On the contrary, the higher their empowerment level, the lower their turnover intention. Therefore, in order to increase nurses' organization commitment and decrease their turnover intention, their empowerment should be increase. And it is necessary to develop the transformational leadership of head nurses so as to increase empowerment.

• 산업공학
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• 제24권4호
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• pp.314-322
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• 2011

This study analyzes a relationship between Data Envelopment Analysis(DEA) efficiency scores and a normalization index in order to examine the validity of DEA models. A normalization index concerned in this study is 'sales per R&D project fund' which is regarded as a crucial R&D project performance evaluation index in practice. For this correlation analysis, three distinct DEA models are selected such as DEA basic model, DEA/AR-I revised model(i.e. DEA basic model with Acceptance Region Type I constraints) and Super-Efficiency(SE) model. Especially, SE model is adopted where efficient R&D projects(i.e. Decision Making Units, DMU's) with DEA efficiency score of unity from DEA basic model can be further differentiated in ranks. Considering the non-normality and outliers, two rank correlation coefficients such as Spearman's ${\rho}_s$ and Kendall's ${\tau}_B$ are investigated in addition to Pearson's ${\gamma}$. With an up-to-date empirical massive dataset of n = 482 R&D projects associated with R&D Loan Program of Korea Information Communication Promotion Fund in the year of 2011, statistically significant (+) correlations are verified between the normalization index and every model's DEA efficiency scores with all three correlation coefficients. Especially, the congruence verified in this empirical analysis can be a useful reference for enhancing the practitioner's acceptability onto DEA efficiency scores as a real-world R&D project performance evaluation index.

• 대한가정학회지
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• 제36권8호
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• pp.1-12
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• 1998

The purpose of this study was to investigate the relationship between children's attributional style and their self-perceived competence. The subjects of this study were 301 third and sixth grades. For data analysis, two-way ANOVA, Pearson's correlation coefficients, and multiple regression were used. Results indicated that there was significant correlation between children's attributional style and their self-perceived competence. Children who attributed good events to intemal, stable, or global causes and bad events to extemal, unstable, or specific causes perceived themselves more competent.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.241-246
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• 2007

The present paper dealt with an experimental study of boiling heat transfer characteristics of $CO_2$. Heat transfer coefficients of the refrigerant flow inside horizontal smooth microchannel were obtained with inner tube diameter of 0.3mm and length of 300mm. The direct electric heating method was applied for supplying the heat uniformly to the refrigerant. The experiments were conducted with $CO_2$ purity of 99.99%, at saturation temperature of $10^{\circ}C$, mass flux ranges of $300{\sim}900\;kg/m^2s$, and heat flux ranges of $15{\sim}45\;kW/m^2$. While heat transfer coefficient increased with the increase of heat flux in the low quality region, the heat transfer coefficient decreased with the increase of quality in the high quality region. The heat transfer coefficients were compared with seven existing correlations with the Gungor-Winterton's(1986) correlation gave the best prediction. A new corelation to predict the two-phase flow heat transfer coefficient was developed based on the Chen(1966) correlation. The new correlation predicted the experimental data well with a mean deviation of 9.69% and average deviation of -3.03%.

• 해양환경안전학회지
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• 제24권3호
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• pp.295-301
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• 2018

This study compares optimization algorithms for efficient estimations of ship's hydrodynamic coefficients. Two constrained algorithms, the interior point and the sequential quadratic programming, are compared for the estimation. Mathematical optimization is designed to get optimal hydrodynamic coefficients for modelling a ship, and benchmark data are collected from sea trials of a training ship. A calibration for environmental influence and a sensitivity analysis for efficiency are carried out prior to implementing the optimization. The optimization is composed of three steps considering correlation between coefficients and manoeuvre characteristics. Manoeuvre characteristics of simulation results for both sets of optimized coefficients are close to each other, and they are also fit to the benchmark data. However, this similarity interferes with the comparison, and it is supposed that optimization conditions, such as designed variables and constraints, are not sufficient to compare them strictly. An enhanced optimization with additional sea trial measurement data should be carried out in future studies.

• Journal of Preventive Medicine and Public Health
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• 제30권4호
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• pp.852-869
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• 1997

This study was conducted to develop and evaluate the reliability and the validity of a questionnaire in order to determine the applicability as a screening tool for estimating environmental exposure and health effects related to air pollution. The questionnaire was developed with adopting some items of others such as ISAAC or ATS-DLD. And then we performed test-retest to 89 middle school students and their mothers at interval of three months. Cohen's Kappa values, weighted Kappa values, Spearman's correlation coefficients, and Pearson's correlation coefficients for each item were computed as reliability coefficients. The validity coefficients and validity coefficient bounds were also obtained by simply using these reliability coefficients. As results, Kappa ranged broadly from 0.10 to 0.61 of the items 'diet', $0.52\sim0.79$ of the environmental tobacco smoke, $0.39\sim0.44$ of the functional categories of surrounding environment, and $0.39\sim0.44$ of the using transportation systems; these items were regarded as confounding factors. For items related to health outcomes, Kappa ranged from -0.02 to 0.37 in the respiratory system of past medical history, and from 0.11 to 0.55 in the current health status. But Kappa of the others were over 0.60. In conclusion, if some items can be corrected or modified, the questionnaire developed in this study can be used as a tool for evaluating environmental exposure and health effects associated with air pollution.

• 인터넷정보학회논문지
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• 제11권6호
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• pp.111-122
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• 2010

디지털 융합을 위한 교육은 다양한 학문과 기술들이 컴퓨터를 중심으로 융합하는 것이므로 교육 범위와 방법이 매우 상이하다. 따라서 교육 계획과 강의전략을 정형화하기 어렵기 때문에 개념적인 정보를 제한적으로 추천하는 문제점이 있다. 본 논문에서는 스피어만 상관 계수를 이용하여 교육 계획과 강의 전략을 제시하기 위한 시스템을 제안한다. 이 시스템은 학계와 산업계의 요구를 기반으로 한 정보로부터 강의 전략 연관성을 찾아 서열화하고, 사용자의 상황과 특성에 적합한 강의 전략 정보를 목록으로 제공하여, 제한적인 개념적 정보 추천의 단점을 해결한다. 성능 실험은 기존의 서비스 시스템들과 비교하여 효과성을 측정하여 정확도와 재현율로 표현하였으며, 성능 실험 결과 정확도는 90.4%, 재현율은 77.6%로 나타났다.

• 설비공학논문집
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• 제12권12호
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• pp.1081-1089
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• 2000

Evaporating heat transfer coefficients of R-22 and R-134a were measured in smooth horizontal copper tubes with inner diameters of 1.77, 3.36 and 5.35mm, respectively. The experiments were conducted in a closed loop, which was driven by a magnetic gear pump. Experiments were performed for the following range of variables: mass velocity (200 to 400 kg/$m^2$.s), saturation temperature($0^{circ}C,; 5^{\circ}C$) and quality(0 to 1.0). Main results obtained are as follows: evaporating heat transfer coefficients in the small diameter tubes (ID<7mm) were observed to be strongly affected by various diameters and to differ from those in the large diameter tubers. The heat transfer coefficients of the small diameter tubes were higher than those of the large diameter tubs. And it was very difficult to apply some well-known previous predictions (Shah`s, Gungor-Winterton`s and Kandlikar`s correlation) to small diameter tubes.

• 한국멀티미디어학회논문지
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• 제13권10호
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• pp.1444-1452
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• 2010

CRUMPET과 같은 모바일 단말기 서비스 시스템은 사용자의 상황과 특성이 사용자마다 서로 달라 정보가 매우 적고 이 또한 연관성을 찾기가 매우 어렵다. 사용자의 상황과 특성에 따른 정보 선호도를 제공하기 힘든 단점과 사용자가 원하는 정확한 정보를 추천하기 어렵기 때문에 개념적인 정보를 제한적으로 추천한다. 따라서 본 논문에서는 스피어만 상관 계수를 이용하여 사용자 상황과 특성에 적합한 정보를 추천하는 시스템을 제안하였다. 사용자 정보로부터 연관성을 찾아 서열화하고 사용자의 상황과 특성에 적합한 정보를 목록으로 제공하여 제한적인 개념적 정보 추천의 단점을 해결하였다. 성능 실험은 기존의 서비스 시스템들과 비교하여 효과성인 정확도와 재현율로 측정하였으며, 성능 실험 결과 정확도는 92.3%, 재현율은 73.8%로 나타났다.

• 대한가정학회지
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• 제24권3호
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• pp.1-9
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• 1986

The purpose of this study was to measure the body cathexis and clothing satisfaction sccording to the level of age, job, and total monthly income and to investigate the relationship between body cathexis and clothing satisfaction of married women. 43 items of body parts and body functions were selected to measure body cathexis from Secord and jourard body Cathexis scale. A nd 56 items of Mclean's Clothing Satisfac tion scale were used for clothing satisfaction. The questionnaires were administered to 384 mothers in Jeonbug province. 3-way ANOVA and Newman-Keuls test were used for group difference. Pearson's Correlation Coefficients, Partial Correlation Coefficients, Standard Deviation, and Mean were calculated. RESULTS : 1. Body cathexis of married women showed asignificant difference according to age. 2. Clothing satisfaction of married women showed a significant difference to the interaction of age, job, and total monthly income. The elder and higher income group without job had the highest clothing satisfaction scores than any other group. 3. Positive correlations were found among body cathexis, clothing satisfaction, and 6 subscales of clothing satisfaction.