• 한국안전학회지
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• 제34권1호
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• pp.76-81
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• 2019

In this study, the causes of human error were identified through the survey of the drivers of the three organizations: Seoul Metro, Seoul Metropolitan Rapid Transit Corporation, and Korail. It was started with the aim of finding and eliciting causes in various directions including human factors, job factors, and environmental factors. The Cronbach alpha value was 0.95 for the reliability significance of the stress-induced factors in the operational area. The significance probability for organisational factors was shown to be 0.82, and the significance of the sub-accident experience and the driving skill factors in operation was 0.81 In addition, the analysis results showed that stress-induced in the field of driving is higher than the human factors in the reliability analysis. The results of the analysis confirmed that the reliability of the organizational and operational stress-induced factors was higher than other causes. In order to reduce urban railroad accidents, this paper suggests a method for operating safe urban railroad through the minimization human errors.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2012년 추계학술대회
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• pp.431-434
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• 2012

The paper reviews properties of hypothesis decision approaches using rejection region and significance probability. The study also presents the guidelines for quality practioners to implement most useful hypothesis testing techniques such as RR(Rejection Region) approach and P-Value approach.

• 대한수학회보
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• 제48권2호
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• pp.325-334
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• 2011

In this paper we consider the discrete time delayed renewal risk model. We investigate what will happen when the distribution function of the discounted proper deficit is asymptotic in the initial surplus. In doing this we establish several lemmas regarding some related ruin quantities in the discrete time delayed renewal risk model, which are of significance on their own right.

• Communications for Statistical Applications and Methods
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• 제20권5호
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• pp.417-425
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• 2013

We consider an extended version of a logarithmic series distribution and discuss the estimation of its parameters by the method of moments and the method of maximum likelihood. Test procedures are suggested to test the significance of the additional parameter of this distribution and all procedures are illustrated with the help of real life data sets. In addition, a simulation study is conducted to assess the performance of the estimators.

• 전기학회논문지
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• 제63권7호
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• pp.968-975
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• 2014

This paper proposed a evaluation method for individual's subjective preferred location using EEG and emotional assessment. Visual stimulus were sequentially presented a total six points(the top and the bottom of the left, the top and the bottom of the center and the top and the bottom of the right on the screen). EEG were measured from twenty subjects according to each six points. At the same time, we were executed evaluation of subjects preferred location from emotional assessment. Alpha and beta wave were measured in Fp1, Fp2, F7 and F8 location, followed by ten to twenty electrode system. Correlations and variations of alpha and beta wave from each channel were calculated and analyzed. Because of the number of subjects population under 30, we used Speareman test for a correlation analysis between alpha and beta wave. Also, emotional assessments which compose of visual sense harmony, visual sense stability, stability of position and the visibility were performed and were analyzed by average and frequency. After visual stimulus, emotional assessments were performed. From the variance analysis of EEG, beta wave from F7 was appeared statistically significant as significance probability of 0.006. Also, between alpha wave and beta wave appeared a negative correlation(r=-0.190). From the post-hoc test of F7 beta wave, location 1, 5 and 6 appeared to difference statistically significant. Emotional assessment result according to six positions showed 0.00 significance probability. Thus, location and emotional assessment appeared to influence on each other. From the average and frequency analysis of emotional assessment, location 2 showed obtained of best emotional assessment score and appeared lower beta wave than other locations. Finally, most subjects showed a preference for location 2. Through obtained results in this paper, will be helpful to about human emotional assessment and EEG research.

• 사상체질의학회지
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• 제12권2호
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• pp.94-103
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• 2000

The purpose of this study is to examine validity to Soeum scales by QSCC II. For this study, the objects are 336 patients who were made a diagnosis of Soeumin and 422 patients of other constitutions in Oriental Medicine & Western Medicine Cooperative Health Examination Center KyungHee University Medical Center. A systematic analysis has been made and the results are as follows. 1. We made a frequency analysis in 758 examinees' questions and concluded that 35 questions, among which 30 questions were existing and 5 were new, had statistical significance in making a diagnosis of Soeumin by more than 10% in comparison with answer frequency of other constitutions. 2. Because confidence coefficient of 0.8011 revised Soeum scales(35) rises up as compared with that of 0.6319 existing Soeum scales(51), I think revised Soeum scales reflect trait of Soeumin well and it is liable to shorten question time by controling questions. 3. Soeumin's discrimination probability in Soeumin was 55.4% by QSCCII, but that rises up to 64.3% by discriminant function made by revised Soeum scales. So there is statistical significance in discriminant function. 4. When questions in QSCCII are divided into body-spirit(體形氣像), looks-attitude(容貌詞氣), temper- talent(性質才幹), continuous mind(恒心), avarice(心慾), physiological symptoms(生理的 證) and pathological symptoms(病理的 證), response frequency and constitution discrimination probability falls in questions about avarice and pathological symptoms.

• PNF and Movement
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• 제12권3호
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• pp.151-158
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• 2014

Purpose: The purpose of the study is to see the effect of walking when training for chronic stroke patients, Affected side vision impairment induced gait training with rhythmic auditory stimulation in parallel. Methods: This study was the general walking training group, the training group was divided damage induced affected side view, affected side view damage induced by rhythm auditory stimulation training three groups. Intervention period was 4 weeks. 5 times per week, per 30 min entered arbitration. Affected Side vision impairment induced induction training was conducted by installing a red cones, rhythmic auditory stimulation was applied to a regular rhythm training using a smartphone application (Metronome). Paired t-test was performed to see the difference between each group and before the intervention. One-way ANOVA was used to find out the significance probability between each group. Statistical significance was set at 0.05 probability. Results: Regular walking group, rather than affected side vision guided walking group could see increases in the FGA and DGI (P<0.05). And vision impairment induced affected side view and rhythmic auditory stimulation induction training this group than in the combination group walking group obtained higher scores on the FGA, DGI score(P<0.05). Conclusion: If you want to enforce certain rhythmic auditory stimulation of the visual field and side damage induced during gait training for stroke patients will be able to expect a better effect.

• Journal of the Korean Statistical Society
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• 제36권2호
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• pp.201-208
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• 2007

Evolutionary operation (EVOP) proposed by Box (1957) is a method for continuous monitoring and improvement of a full-scale manufacturing process with the objective of moving the operating conditions toward the better ones. EVOP consists of systematically making small changes in the levels of the two or three process variables under consideration. Data are collected on the response variable at each point of two level factorial design with the center point and a cycle is said to have been completed. The cycles are replicated sequentially until the decision is made on whether further cycle of experiments is needed to conclude the significance of any of main effects or interaction effects or the curvature. In this paper, an improved flow chart of EVOP is proposed and how to determine the number of cycles is studied based on the size of type II error. In order to reject the alternative hypothesis of interests with more confidence and conclude that we believe in the null hypothesis of no effects, we propose a counter measure $p^*-value$ corresponding to the p-value. The relationship of $p^*-value$ to the probability of type II error ${\beta}$ under the alternative hypothesis of interests is analogous to that of p-value to the probability of type I error ${\alpha}$. Also the implementation of EVOP with a mixture experiment is discussed.

• 한국통신학회논문지
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• 제26권12A호
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• pp.1971-1977
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• 2001

이동무선통신환경에서의 다중경로 레일레이 페이딩 채널은 선형 필터 모델로 나타내어 질 수 있고, 지연 경로의 특성에 따라 필터 탭 중 일부만이 수신기 설계에 있어 중요하게 고려될 수 있다. 지연경로를 나타내는 탭 계수의 크기에 따라 채널 등화기에서 선택적으로 탭을 사용함으로써 수신기의 복잡도를 감소시키고 사용 전력을 줄이는 효과를 가져오게 된다. 본 논문에서는 주어진 채널의 선형 필터 모델에서 최적의 방법으로 탭을 선택하는 방법을 제시하고, 기존의 방법과 비교하여 성능 향상을 보였다. 또한 잡음 전력 값에 대한 정보가 있는 경우, 제시된 방법은 CFAR (Constant False Alarm Rate) 판별의 장점을 가지게 됨을 보이고, 잡음 전력을 추정했을 시의 성능을 정확한 수식으로 유도하였다. 잡음 전력 추정을 위한 잡음 샘플 수를 증가시킴에 따라 빠른 속도로 최적 성능으로 수렴함을 유도된 수식과 시뮬레이션 결과를 통해 확인하였다.

• 대기
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• 제19권2호
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• pp.199-211
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• 2009

In this paper, we examine the multiple change-point and change pattern in the 54 years (1954-2007) time series of the annual and the heavy precipitation characteristics (amount, days and intensity) averaged over South Korea. A Bayesian approach is used for detecting of mean and/or variance changes in a sequence of independent univariate normal observations. Using non-informative priors for the parameters, the Bayesian model selection is performed by the posterior probability through the intrinsic Bayes factor of Berger and Pericchi (1996). To investigate the significance of the changes in the precipitation characteristics between before and after the change-point, the posterior probability and 90% highest posterior density credible intervals are examined. The results showed that no significant changes have occurred in the annual precipitation characteristics (amount, days and intensity) and the heavy precipitation intensity. On the other hand, a statistically significant single change has occurred around 1996 or 1997 in the heavy precipitation days and amount. The heavy precipitation amount and days have increased after the change-point but no changes in the variances.