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RISS 인기검색어
- 검색키워드
- 저자 : 우정수 (검색결과 162 건)
- 무료
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- 유료
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Jackknife estimation in an exponential model
우정수 한국데이터정보과학회 2004 한국데이터정보과학회지 Vol.15 No.1
Parametric estimation of truncated point in a truncated exponential distribution will be considered. The MLE, bias reducing estimator and the ordinary jackknife estimator of the truncated parameter will be compared by mean square errors. And the MME and MLE of mean parameter and estimations of the right tail probability in the distribution will be compared by their MSE's.
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우정수,Woo, Jeong-Sao 대한기관식도과학회 2010 大韓氣管食道科學會誌 Vol.16 No.2
The pathophysiology of Gastroesophageal reflux disease (GERD) has been known that it is developed when the offense-primarily the gastric acid-pepsin content of the refluxate-overcomes a 3-tiered esophageal protective defense. consisting of antireflux mechanisms, luminal clearance mechanisms, and tissue resistance. Laryngopharyngeal reflux (LPR), which is known as an extraesophageal variant of GERD, has been considered to be developed by transient lower esophageal sphincter relaxation (TLESR), direct mucosal injury by gastric contents, more sensitive mucosa compared to esophagus, and absence of buffering effect and aggravation of the injury due to pepsin. However, hypothesis of the pathophysiology in both entities are numerous and still lack of understanding for being a theory. There is no conflict that understanding the pathophysiology is necessary for resolving the problems of these diseases and numerous studies and results have been releasing. This review could provide clinicians dealing with GERD and LPR with applicable new information and help for overcoming the clinical obstruction.
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Reliability P(Y<X) in Two Independent Uniform and Weibull-Gamma
우정수 한국데이터정보과학회 2007 한국데이터정보과학회지 Vol.18 No.3
We consider estimation of reliability P(Y<X), when X and Y are two independent Weibull random variable and uniform random variable, respectively, and also consider the estimation problem when X and Y are two different independent Gamma random variable and uniform random variable, respectively.
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Reliability in two Independent Levy andUniform-Exponential Distribution
우정수 한국데이터정보과학회 2008 한국데이터정보과학회지 Vol.19 No.2
We consider estimation of reliability P(Y<X) when X and Y are independent Levy random variable and uniform random variable, respectively, and also consider the estimation problem when X and Y are two different independent Levy random variable and exponential random variable, respectively.
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Estimating Reliability and Distribution of Ratio in two independent Different Variates
우정수 한국데이터정보과학회 2008 한국데이터정보과학회지 Vol.19 No.3
We consider densities of quotient Y/X and ratio X/(X+Y), and estimation of reliability P(Y<X) when X and Y are independent p-dimensional Rayleigh random variable and uniform random variable, respectively, and also consider the quotient and ratio densities, and the estimation problem when X and Y are two different independent p-dimensional Rayleigh random variable and Rayleigh random variable, respectively.
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On Approximate Maximum Likelihood Estimation in a Log-Logistic Distribution
우정수,김중대 한국데이터정보과학회 2008 한국데이터정보과학회지 Vol.19 No.1
We derive some properties of a log-logistic distribution, its k-th moment, and the densities of product and quotient of two independent identical log-logistic distributions. And we compare simulated mean squared errors of an approximate maximum likelihood estimator(AML) and moment estimator of a parameter in the log-logistic distribution.
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Notes on the Ratio and the Right-Tail Probability in a Log-Laplace Distribution
우정수 한국데이터정보과학회 2007 한국데이터정보과학회지 Vol.18 No.4
We consider estimation of the right-tail probability in a log-Laplace random variable, As we derive the density of ratio of two independent log-Laplace random variables, the k-th moment of the ratio is represented by a special mathematical function. and hence variance of the ratio can be represented by a psi-function.
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The UMVUE and MLE of the Tail Probability in Discrete Model
우정수 한국데이터정보과학회 2006 한국데이터정보과학회지 Vol.17 No.4
We shall derive the UMVUE of the tail probability in Poisson, Binomial, and negative Binomial distributions, and compare means squared errors of the UMVUE and the MLE of the tail probability in each case.
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Notes on a skew-symmetric inverse double Weibull distribution
우정수 한국데이터정보과학회 2009 한국데이터정보과학회지 Vol.20 No.2
For an inverse double Weibull distribution which is symmetric about zero, we obtain distribution and moment of ratio of independent inverse double Weibull variables, and also obtain the cumulative distribution function and moment of a skew-symmetric inverse double Weibull distribution. And we introduce a skew-symmetric inverse double Weibull generated by a double Weibull distribution.
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우정수,권순영,정광윤,김인선 대한의학회 2004 Journal of Korean medical science Vol.19 No.3
Hybrid carcinoma of the salivary gland is a very rare entity that has been described only in the parotid and palate. The occurrence of a hybrid carcinoma of maxillary sinus has not been reported. The diagnosis of hybrid carcinoma is important partic-ularly when the components of tumor have different biologic behaviors. Diagnosis and treatment require a high index of suspicion, especially when the tumor is an epithelial-myoepithelial carcinoma, pathological effort to look for a more aggressive accompanying tumor, and proper oncologic treatment. We describe a case of 26-yr-old woman with a hybrid carcinoma composed of epithelial-myoepithelial carcinoma with an adenoid cystic carcinoma component (cribriform pattern) in the right maxillary sinus with a brief review of the relevant literature.
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