• (The)Study of the Eastern Classic
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• no.73
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• pp.327-360
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• 2018

Ryu Seongryong, a Confucian scholar and politician, are two sides of the same coin that cannot be separated from each other. The scholarship of Confucian intellectuals is oriented toward the practice of the managing state and salvation of the world(經國濟世), and the precise study of historical precedent and political scene affects the success or failure of politicians. Ryu was able to become a real savior of Joseon Dynasty in crisis, because he synthesized dialectically both without distinction between theory and field. However, previous studies on Ryu did not pay attention to these points. In this article, I would like to start from the point that Ryu was interested in the Learning of Wang Yangming without being satisfied with the Neo-Confucianism. And I want to emphasize that he had a pragmatic view that was different from the orthodox scholars and that he was able to demonstrate his ability to cope with crisis even when Joseon was hit by the Japanese invasion of 1592. In short, this article seeks to re-examine Ryu's life in terms of pragmatism and realism which pursued a balance between learning and practice.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.766-767
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• 2013

• Communications for Statistical Applications and Methods
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• v.20 no.2
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• pp.137-145
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• 2013

The use of pooled standard deviation can reduce the efficiency loss in optimum allocation when strata standard deviations are estimated and several of them are equal. Also shown is that the pooled standard deviation is useful in optimum allocation under a multivariate setting. In addition to theoretical development, we provide the result of simulation study to support the theory.

• 제어로봇시스템학회:학술대회논문집
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• 2002.10a
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• pp.53.3-53
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• 2002

1. Introdition : The necessity of DGPS data compensation. 2. Configuration of the GPS and coordinates conversion 2-1. Coordinates conversion of CCD 3. Vehicle Model and Evaluation 4. Accurate error position algorithm. 5. Experiment and result. 6. Conclusion: It was possible that we converted the CCD data into the GPS coordinates data.

• Journal of the Korean Data and Information Science Society
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• v.25 no.1
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• pp.263-269
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• 2014

When the loss of samples appears under repeated surveys, new samples can often replace missing values. Estimators using response probability can be considered under repeated surveys on two occasions where new samples are selected instead of missing data on the second occasion. We propose a new estimator that uses both respondents and new samples on the second occasion. It is considered for the simulation setting that missing values can happen at the second occasion and are replaced by new samples. We can see that the proposed estimator is more efficient than that using a weighting adjustment method for respondents at the second occasion.

• Communications for Statistical Applications and Methods
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• v.21 no.6
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• pp.513-520
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• 2014

We study numerical methods to obtain the stationary probabilities of continuous-time Markov chains whose embedded chains are periodic. The power method is applied to the balance equations of the periodic embedded Markov chains. The power method can have the convergence speed of exponential rate that is ambiguous in its application to original continuous-time Markov chains since the embedded chains are discrete-time processes. An illustrative example is presented to investigate the numerical iteration of this paper. A numerical study shows that a rapid and stable solution for stationary probabilities can be achieved regardless of periodicity and initial conditions.

• The Korean Journal of Applied Statistics
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• v.26 no.1
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• pp.111-118
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• 2013

In this paper we study the effect of failure detection equipment(FDE)s on system availability. A new repair scheme is considered for the step of repairing FDE which becomes out of order in the course of repairing the main system(MS). We compute and compare the availability of MS.

• Journal of the Korean Data and Information Science Society
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• v.26 no.2
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• pp.377-385
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• 2015

After performing callback for nonresponses in sample survey, we present an estimator of regression form using an auxiliary variable and a variance estimator using replicate method. Parametric inference method of the response probability is also presented. We research an unbiased estimator of high efficiency for the population mean and a variance estimator with consistency under callback. We also prove the validity of the theory through the simulation.

• The Korean Journal of Applied Statistics
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• v.29 no.4
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• pp.679-688
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• 2016

In this paper, we study multiclass loss systems with different server allocation methods. The Markovian states of the systems are defined and their effective representation is investigated. The limiting probabilities are derived based on the Markovian property to determine the performance measures of the systems. The effects of the assignment methods are compared using numerical solutions.

• Communications for Statistical Applications and Methods
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• v.29 no.2
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• pp.151-160
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• 2022

The total system is composed of the main system (MS) and the failure detection equipment (FDE) which detects failures of MS. The analysis of system reliability is performed when the failure of FDE is possible. Several repair policies are considered to determine the order of repair of failed systems, which are sequential repair (SQ), priority repair (PR), independent repair (ID), and simultaneous repair (SM). The states of MS-FDE systems are represented by Markov models according to repair policies and the main purpose of this paper is to derive the system availabilities of the Markov models. Analytical solutions of the stationary equations are derived for the Markov models and the system availabilities are immediately determined using the stationary solutions. A simple illustrative example is discussed for the comparison of availability values of the repair policies considered in this paper.