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Jelinski-Moranda와 Goel-Okumoto의 소프트웨어 신뢰도 성장 모형의 베이지안 접근
최기헌,안미연 高麗大學校統計硏究所 2000 應用統計 Vol.15 No.-
대표적인 소프트웨어 신뢰도 모형인 Jelinski-Moranda 모형과 Goel-Okumoto가 제안한 수정된 JM 모형에 대해 깁스 표본추출 알고리즘을 이용하여 비교하였다. 여기서 사전분포로 포아송 분포와 음이항 분포를 갖고서 각각의 모형에 대하여 베이지안 추론과 모형선택을 논한다. Bayesian formulations for Jelinski-Moranda model and Goel-Okumoto model of software reliability growth models are considered. We deal with Poisson, negative Binomial prior distributions using Gibbs sampling algorithm and also explore Bayesian computation and model selection.
최기헌 德成女子大學校 1996 德成女大論文集 Vol.26 No.-
Computer-intensive algorithms, such as iterative, sampling-based method, have become increasingly popular statistical tools, both in applied and theoretical work. Gibbs sampling is a simulation tool for obtaining marginal distribution from a nonnormalized joint density. We showed the Gibbs sampler along the three main research threads which have framed this effort-probabilistic issues, algorithmic implementation, and demanding application. The Gibbs sampler is mainly used to generate posterior distributions, whereas for the classical statistician a major use is for calculation of the likelihood function and characteristic of likelihood estimators. Finally we give examples of application.
안기형,박현규,최부귀,이종헌 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1
This paper consist of new secure communication system from using synchronization methode of chaotic signal which Pecora and Carroll have shown, and experimentally proved the validity of this communication system. This communication system transmits the informational signals via the modulation of chaotic signals, and the receiver recovers the original informational signals from modulate chaotic signals by synchronization of chaotic signals driven together Chua circuit was used in generating chaotic signals and nonlinear resistor of this Chua circuit was confirmed by using two OP amps and six resistors.
이종성,최군호,조용석,박기헌 成均館大學校 科學技術硏究所 1996 論文集 Vol.47 No.1
This paper treats the guide path tracking problem of an experimental automated guided vehicle. An experimental guide path is made of aluminium foil which has width of 2[cm]. When a aluminium foil is used as the guide path, this may be less stable than a conservative rail guide path. In this case, it is necessary to control the steering system which influences the system stability. A digital PD(Proportional and Derivative)controller is used to manipulate the steering system and it is verified by laboratory experiments that the designed AGV tracks the guide path within the range of 3.2[cm] deviation. In order to increase accuracy of the guide path tracking, it would be necessary to introduce the constant speed mode and slow-down speed mode according to the state of guide path.
오차항이 2차 자기회귀과정을 따르는 선형회귀모형에서의 보통 최소제곱 추정량의 효율성 연구
송석헌,최기헌 德成女子大學校 1996 德成女大論文集 Vol.26 No.-
In this paper a linear regression model is considered with the sample mean to be estimated, when the disturbances are generated by second-order autoregressive,(AR(2)) process. We derive the efficiency function for the ordinary least squares estimator relative to the generalized least squares estimator for the finite sample size. In the case of positive parameters of AR(2)-process a greatest lower bound for the efficiency of OLSE relative to GLSE is established.
Minimum risk point estimation of two-stage procedure for mean
Ki Heon Choi 한국데이터정보과학회 2009 한국데이터정보과학회지 Vol.20 No.5
The two-stage minimum risk point estimation of mean, the probability of success in a sequence of Bernoulli trials, is considered for the case where loss is taken to be symmetrized relative squared error of estimation, plus a xed cost per observation. First order asymptotic expansions are obtained for large sample properties of two- stage procedure. Monte Carlo simulation is carried out to obtain the expected sample size that minimizes the risk and to examine its nite sample behavior.
Some Properties of Sequential Point Estimation of the Mean
Choi, Ki-Heon The Korean Data and Information Science Society 2005 한국데이터정보과학회지 Vol.16 No.3
Under the minimum risk point estimation formulation of Robbins(1959), we consider the sequential point estimation problem for normal population $N({\theta},\;{\theta})$ with unknown parameter ${\theta}$. In the case of completely unknown ${\theta}$, Stein's(1945) two-stage procedure is known to enjoy the consistency property, but it is not even first-order efficient. In the case when ${\theta}>{\theta}_L\;where\;{\theta}_L(>0)$ is known, the revised two-stage procedure is shown to enjoy all the usual second-order properties.
Choi,Ki-Heon 德成女子大學校 1996 德成女大論文集 Vol.25 No.-
자기 회귀 과정(autoregressive process)에서 적용 축차 확률비 검정(adaptive sequential probability ratio test)을 적합 시켰을 때 경계를 넘는 극한 분포를 구하였다.
A Note on the Nonlinear Renewal Theory
Choi,Ki-Heon 德成女子大學校 1996 德成女大論文集 Vol.27 No.-
본 연구는 Z?=S?+?,N≥1 에 대한 재생이론 (renewal theory)의 확장을 논한다. 먼저 모든 a≥0에 대하여 t?<≥w.p. 1이고, a→∞함에 따라 t?/a→1 w.p 1을 보인다. 또한 a→∞함에 따라 t?:=(t?-a)/?이 근사적으로 평균이 -1이고 분산 ?인 정규분포를 따르는 것을 보인다. 그리고 R?는 극한분포 H를 가지는 것을 보인다.