• Journal of the Korean Statistical Society
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• 제23권1호
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• pp.135-149
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• 1994

We discussed a comparison of distribution-free two-sample procedures based on placements or ranks. Iterative asymptotic distribution of both two-sample procedures is studies and small sample Monte Carlo simulation results are presented. Also, we proposed the Hodges-Lehmann type location estimator based on linear placement statistics.

• 한국컴퓨터정보학회논문지
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• 제11권4호
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• pp.9-15
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• 2006

본 논문에서는 잡음영상에서 효과적인 에지검출을 위해 이표본 위치문제(two-sample location Problem)에서 잘 알려진 선형 순위 검정법(linear raft test)인 Wilcoxon 검정법, Median 검정법 그리고 Van der Waerden 검정법을 적용하고자 한다. 에지 존재 유무는 에지-높이 모수(edge-height parameter)를 사용한 모형 하에서 인접한 두 개의 근방영역간의 평균 차이를 검정함으로서 통계적으로 결정한다. 여기서 근방영역의 크기와 형태는 에지검출을 위한 계산 속도와 에지방향을 고려하여 적응성 있게(adaptively) 결정하였다. 통계적 방법들의 에지검출 성능을 평가하기 위해 자연영상(natural images)과 인조영상(synthetic images) 그리고 잡음이 추가된 영상에 대해 실험을 실시하고 비교 분석하였다.

• Communications for Statistical Applications and Methods
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• 제16권4호
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• pp.615-625
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• 2009

본 논문에서는 영상의 에지검출을 하는데 사용되는 여러 가지 윈도우 배치(window configurations)하에서 통계학의 이표본 위치문제(two-sample location problem)에서 대표적인 Wilcoxon 검정과 T-검정에 기초한 에지검출법에 대해 논의하고자 한다. 영상의 에지검출하는데 윈도우 배치 선택은 에지검출 성능을 결정하는 중요한 요소이다. 본 논문에서 에지는 선택된 윈도우 배치 하에서 에지-높이 모수(edge-height parameter)를 사용한 에지 모형 하에서 두 근방 영역간의 유의한 차이가 있는지를 검정함으로서 결정한다. 영상 실험에서 윈도우 배치에 따른 통계적 검정에 의한 에지검출 성능은 에지 맵(edge map)을 통한 정성적인 비교와 객관적인 척도하에서 정량적인 비교 그리고 CPU 계산시간까지 고려하여 분석하였다.

• Journal of the Korean Statistical Society
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• 제26권4호
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• pp.467-476
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• 1997

The two-sample t-test is not expected to be optimal when the two samples are not drawn from normal populations. According to Box and Cox (1964), the transformation is estimated to enhance the normality of the tranformed data. We investigate the asymptotic relative efficiency of the ordinary t-test versus t-test applied transformation introduced by Yeo and Johnson (1997) under Pitman local alternatives. The theoretical and simulation studies show that two-sample t-test using transformed date gives higher power than ordinary t-test for location-shift models.

• Communications for Statistical Applications and Methods
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• 제19권1호
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• pp.129-134
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• 2012

In this paper we review a bi-aspect nonparametric test for the two-sample problem under the location translation model and propose a new one to accommodate a more broad class of underlying distributions. Then we compare the performance of our proposed test with other existing ones by obtaining empirical powers through a simulation study. Then we discuss some interesting features related to the bi-aspect test with a comment on a possible expansion for the proposed test as concluding remarks.

• 품질경영학회지
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• 제22권2호
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• pp.166-176
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• 1994

Some rank score tests are proposed for testing the equality of all sampling distribution functions against ordered location-scale alternatives in k-sample problem. Under the null hypothesis and a contiguous sequence of ordered location-scale alternatives, the asymptotic properties of the proposed test statistics are investigated. Also, the asymptotic local powers are compared with each others. The results show that the proposed tests based on the Hettmansperger-Norton type statistic are more powerful than others for the general ordered location-scale alternatives. However, the Shiraishi's tests based on the sum of two Bartholomew's rank analogue statistics are robust.

• 응용통계연구
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• 제14권1호
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• pp.149-160
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• 2001

본 논문에서는 이표본 위치문제에서 대표적인 윌콕슨 검정법과 T 검정법을 사용하여 잡음영상에서 에지를 검출하고자 한다. 에지높이모수를 사용하여 얻은 수정된 농도값상에서 검정통계량을 계산하고 유의수준에 의해 결정된 임계값과 비교하여 에지유무를 판정한다. 영상실험을 통하여 얻은 에지맵과 객관적인 척도하에서 에지검출 성능을 비교분석한다.

• Journal of the Korean Statistical Society
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• 제13권1호
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• pp.48-56
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• 1984

This paper considers one-sample and two-sample test for the logistic function by means of Kolmororov-Smirnov type statistics. The standard tables used for the Kolmogorov-Smirnov test are valid only when the function is completely specified; but they are not valid if the parameters of function are estimated from the sample. This note presents modified tables for the Kolmogorov-Sminov type staistic. These tables can be used to test the hypothesis that a sample comes from a logistic function when shape parameter $(\alpha)$ and location parameter $(\beta)$ must be estimated from the sample by the method of maximum likelihood. Monte Carlo method is employed to calculate the criticla values of the test. The tables of the critical values are provided.

• Journal of the Korean Statistical Society
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• 제31권1호
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• pp.109-120
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• 2002

In this paper, we show the weak convergence of U-empirical processes for two sample problem. We use the result to show the asymptotic normality for the generalized dodges-Lehmann estimates with the Bahadur representation for quantifies of U-empirical distributions. Also we consider the asymptotic normality for the test statistics in a simple way.

• 전기학회논문지P
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• 제65권1호
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• pp.47-52
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• 2016

Fault location identification in the transmission line is an essential part of quick service restoration for maintaining a stable in power system. The application of digital schemes to protection IEDs has led to the development of digital fault locators. Normally, the impedance measurement had been used to for the location detection of transmission line faults. It is well known that the most accurate fault location scheme uses two-ended measurements. This paper deals with the complete design of a fault locator using GPS time-synchronized phasor for transmission line fault detection. The fault location algorithm uses the transmitted relaying signals from the two-ended terminal. The fault locator hardware consists of a Main Processor Unit, Analog Digital Processor Unit, Signal Interface Unit, and Power module. In this paper, sample real-time test cases using COMTRADE format of Omicron apparatus are included. We can see that the implemented fault locator identified all the test faults.