• Nutrition Research and Practice
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• 제8권4호
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• pp.432-438
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• 2014

BACKGROUND/OBJECTIVES: This research was conducted to develop a construct model regarding the dietary style, late night snacking choice attributes and health promotion behaviors of industrial workers. SUBJECTS/METHODS: The surveys were collected during the period between January and February 2013. A statistical analysis of 888 industrial workers was conducted using SPSS 12.0 for Windows and SEM (Structural Equation Model) using AMOS (Analysis of Moment Structure) 5.0 statistics package. RESULTS: The results of the correlations between all variables showed significant positive correlations (P < 0.05). Results of factors analysis on dietary styles were categorized into five factors and health promotion behaviors were categorized into four. The reliability of these findings was supported by a Cronbach's alpha coefficient of 0.6 and higher for all other factors. After obtaining the factors from processing an exploratory factor analysis and the end results supported the validity. In an attempt to study the late night snacking choice attributes in accordance to dietary styles and the health promotion behaviors of industrial workers, a structural equation model was constructed and analyzed. CONCLUSIONS: All tests proved the model satisfied the recommended levels of the goodness on fit index, and thus, the overall research model was proved to be appropriate.

• 한국농공학회지
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• 제24권1호
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• pp.53-62
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• 1982

This study was attempted to find best fitted distribution and the equations for probable maximum flow with the evaluation of parameters by the method of moment for the rat- ional design of hydraulic structures in the annual exceedance series. Six subwatersheds were selected as studying basins along Geum River basin. The results obtained through this study were analyzed and summarized as follows. 1. Fitted probability distribution was showed in the order of Three Parameter Lognorm al, Type 1 Extremal, Exponential, Pearson Type III, and Log Pearson Type I distribu- tion as the results of x$^2$ goodness of fit test. 2. Kolmogorov-Smirnov test showed in the order of Three Parameter Lognormal, Exp- onential' Pearson Type III, Log Pearson Type III and Type 1 Extremal distribution for the fitted probability distribution. 3. It can be concluded that Three parameter Lognormal distribution is a best fitted one among some other distributions out of respect for each both tests. An Exponential distribution was proposed as a suitable one by Chow, V.T. showeci lower fittness than that of Three Parameter Lognormal in Geum River basin. 5. Probable flood flow equations followins the return periods for each station were obt- ained by Three Parameter Lognormal distribution. 6. It is urgently essential that best fitted probability distribution should be established for the annual exceedance series in the main river systems of Korea.

• 한국대기환경학회지
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• 제18권6호
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• pp.465-474
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• 2002

In order to reflect variability due to exposure factors as well as to assess uncertainty associated with cancer risk posed by airborne trace metals, a Monte Calro analysis has been made in this study. Input parameters for Monte Carlo analysis were developed or adjusted using body weight, lifetime, and exposure frequency of Koreans. Ambient distributions of toxic metals were founded to be lognormal distributions for most of them using goodness-of-fit tests. Thus, the 95% UCL and 95% LCL of carcinogenic metals were estimated by H-statistic method for lognormal distribution, respectively. The results of Monte Carlo analysis of 95% UCL showed that the 95th percentile risks for men and women were 1.2 and 1.1 times higher than an acceptable risk of 10$^{-5}$ , respectively. The probabilities which those risks exceed the acceptable risk were estimated to be 8% and 6%, respectively, while to be 95% and 94%, respectively on the basis of the minimum acceptable risk of 10$^{-6}$ , respectively. Approximately 90% of total cancer risk came from human carcinogens such as arsenic and hexavalent chromium. Therefore, it is necessary to properly manage both arsenic and hexavalent chromium emissions in the study area.

• 한국통신학회논문지
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• 제39C권9호
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• pp.852-860
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• 2014

본 논문에서 임펄스성 잡음의 유무를 검증하는 알고리즘을 제안한다. 본 알고리즘을 제안하는 이유는 기존의 Kolmogorov-Smirnov 검증의 단점으로 낮은 분류 성공률 및 높은 복잡도가 있기 때문이다. 이는 이론적으로 문제가 없으나 실제로 구현함에 있어 많은 문제를 야기한다. 먼저 기존의 검증 방법을 설명 후 제안하는 알고리즘을 설명한다. 이 알고리즘은 기존의 Kolmogorov-Smirnov 검증 방법의 이론적 배경으로부터 제안된다. 알고리즘의 효율성을 증명하기 위해 임펄스성 잡음의 샘플을 이용하여 실험 후, 검증 실패 확률을 조사한다. 검증 실패 확률에 기반한 실험 결과는 제안한 알고리즘의 효율성을 증명한다.

• The Journal of Asian Finance, Economics and Business
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• 제6권4호
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• pp.249-260
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• 2019

The study examines the impact of financial risk, convenience risk, non-delivery risk; return policy risk and product risk on online consumer behavior of Malaysian consumers. The research employed a self-administered survey to collect empirical data from 245 Malaysian online shoppers by using convenience sampling. Cronbach alpha was calculated to confirm the reliability of the data and then normality was assessed. Confirmatory Factor Analysis was then conducted to test the model using the goodness-of-fit tests. And finally, structural equation modeling is used to test the hypotheses and draw conclusions. IBM SPSS AMOS version 22.0 was utilized for data analysis. The research indicates that product risk, convenience risk, and return policy risk have a significant and positive impact on online shopping behavior. Financial risk is found to have insignificant and negative effects on consumer behavior. In addition, the non-delivery risk is found to have a significant and negative impact on online shopping behavior. The findings provide a useful model for measuring and managing perceived risk in online shopping which may result in an increase in participation of Malaysian consumers and reduce their cognitive deficiencies in the e-commerce environment. Several managerial implications are discussed along with the scope for future research.

• Communications for Statistical Applications and Methods
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• 제15권4호
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• pp.615-631
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• 2008

재무자료에 대한 신용평가모형은 각각의 재무변수를 평활한 예측부도율로 변환하여 사용한다. 본 연구에서는 연속형 재무자료를 변환하여 설정된 신용평가모형의 문제점을 살펴보고, 연속형 재무변수를 다양한 형태로 범주화한 신용평가모형들을 제안한다. 범주형 재무자료를 사용해서 개발한 여러 종류의 신용평가모형들의 성과를 다양한 적합성 검증 방법으로 비교하고, 범주형 재무자료를 이용한 신용평가모형의 유용성을 토론한다.

• 물과 미래
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• 제28권5호
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• pp.191-203
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• 1995

본 연구에서는 한강의 주요 수위관측지점중 하나인 팔당댐 하류 고안지점의 과거 연최대 홍수위자료를 1994년 단면을 기준으로 홍수위를 환산하고 홍수 빈도해석을 통하여 확률홍수량을 산정하였다. 과거 홍수위자료에 대한 현 하상상태에서의 환산수위를 구하기 위해서 최근에 새롭게 확립된 수위-유량 관계곡선을 이용하였다. 기왕의 연최대 홍수량자료를 기본자료로 하여 수문해석에서 많이 이용되고 있는 10개의 확률분포형을 가지고, 확률가중 모멘트법에 의해 매개변수를 추정하고, 적합도 검정을 한 결과 gamma-2, gamma-3 분포형이 최적분포형인 것으로 나타났으며, 빈도해석을 통해 재현기간별로 확률홍수량 및 확률홍수위를 산정하였다. 또한, 결측된 자료를 보완하기 위하여 과거 홍수정보를 이용하는 기법을 사용하여 기왕의 홍수량에 대한 빈도해석을 실시하여 확률분포형에 의한 산정값과 비교하였다.

• 한국수자원학회논문집
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• 제32권3호
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• pp.247-254
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• 1999

우리 나라 주요 우량관측소 22개 지점의 매년 최대치 강우자료에 대하여 빈도해석을 실시하였다. 매개변수 추정방법은 모멘트법, 확률가중 모멘트법, 최우도법 등이며, 매개변수 적합성, 도시적 해석, 분리효과, 적합도 검정결과 GEV 분포가 우리 나라 강우자료에 대하여 가장 적합한 확률분포형으로 나타났다. 선정된 GEV 분포형을 모집단의 확률분포형으로 가정하여 재현기간별 확률강우량을 산정하므로써 지역적 해석을 실시하였으며, 정확도 있는 선형화 기법을 통해 회귀분석을 실시하여 확률강두강도식을 유도하였다. 본 연구에서 유도된 확률강우강도식은 실무차원에서 임의 지속기간의 재현기간별 확률강우량을 간편하게 구할 수 있을 것으로 판단된다.

• Journal of Nutrition and Health
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• 제45권4호
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• pp.390-399
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• 2012

The objective of this study was to develop and evaluate the construct validity of a Nutrition Quotient (NQ) for children. In a previous report (Kang, et al., 2012), the food behavior checklist for children's NQ, consisting of 19 items, was grouped into a 5-factor structure according to the exploratory factor analysis: balance, diversity, moderation, regularity, and practice. In this study, the construct validity of the NQ was assessed using a confirmatory factor analysis. Elementary school students (n = 1,393) from six large cities completed the NQ test. Indicator tests suggested an adequate model fit (goodness of fit index = 0.9613; adjusted GFI = 0.95; standardized root mean square residual = 0.0464; chi-square test statistics of < 0.001 p-value, 82.1), and item loadings were significant for all subscales (p < 0.05). The standardized path coefficients were used as the weights of the items. The NQ and the 5 factor scores of the student were calculated by the obtained weights of the questionnaire items. Logistic regression was applied to find the significant factors in order to affect a specific nutrient status. The receiver operation characteristic curve analyses were performed in order to find diagnostic cut-off points of the five factors. The food behavior checklist for children's NQ would be a handy and suitable instrument for evaluating dietary behaviors of Korean children.

• 콘크리트학회논문집
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• 제16권5호
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• pp.581-589
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• 2004

본 논문에서는 일정진폭 휨인장 및 쪼갬인장 반복하중을 받는 콘크리트의 피로신뢰성과 모델제안을 위하여 도로포장에 사용되는 콘크리트를 대상으로 연구하였다. 실험데이터는 2-모수 Weibull 확률분포함수를 사용하여 신뢰성 해석을 수행하였고, 적합도 검정을 통하여 이를 기반으로 한 모델을 제시하였다. 피로실험은 $150 mm{\times}75 mm$ 시험체의 쪼갬인장피로 실험방법과 $150 mm{\times}150 mm{\times}550 mm$ 시험체의 휨인장피로 실험방법을 적용였으며 일정 진폭 피로하중에 대하여 수행하였다. 두 가지의 실험방법에 대하여 응력 수준 90, 80, $70\%$로 변화하여 실험하고 이때 적용한 응력비는 0.1, 하중재하속도 20Hz, 정현파(sine)를 적용하였다. 연구결과 콘크리트 피로데이터의 분산성으로 인하여 보다 정확한 해석을 위해 두 가지의 해석 기준을 설정하여 제시하였으며, 그래픽방법, 모멘트방법 및 최우도법에 의해 2-모수 Weibull의 매개변수 $\alpha$와 u를 계산하고 이를 이용하여 확률밀도함수(P.D.F)와 누적분포함수(C.D.F)를 도시하였다. 또한, Weibull의 확률분포함수를 이용한 신뢰성 해석은 Kolmogorov-Smirnov의 방법을 사용하여 $5\%$의 유의수준에서 적합도 검정을 수행한 결과 채택되는 것으로 나타났다. 이러한 해석에 기초하여 쪼갬인장피로실험과 휨인장피로 실험에 대한 피로모델을 제시하고 응력수준에 따른 피로수명과 200만회 및 1,000만회에서의 피로강도를 산정하여 제시하였으며 국외의 주요 피로모델과 비교하였다.