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Estimation for Functions of Two Parameters in the Pareto Distribution
우정수,강석복,Woo, Jung-Soo,Kang, Suk-Bok Korean Data and Information Science Society 1990 한국데이터정보과학회지 Vol.1 No.-
For a two-parameter Pareto distribution, the uniformly minimum variance unbiased estimateors(UMVUE) for the function of the two parameters are expressed in terms of confluent hypergeometric function. The variance of the UMVUE is also expressed in terms of hypergeometric function of several variables. UMVUE's for the ${\gamma}th$ moment about zero and several useful parametric functions, and their variances are obtained as special cases. The estimators of Baxter(1980) and Saksena and Johnson(1984) are special cases of our estimator.
The MLE and the UMVUE of the Right-Tail Probability in a Levy Distribution
우정수,이화정,Woo, Jung-Soo,Lee, Hwa-Jung The Korean Data and Information Science Society 2001 한국데이터정보과학회지 Vol.12 No.2
MLE and UMVUE of the right-tail probability in a Levy distribution will be considered, and hence the UMVUE is more efficient in a sense of simulated MSE than the MLE of the right-tail probability.
우정수,이창수,Woo, Jung-Soo,Lee, Chang-Soo The Korean Data and Information Science Society 1993 한국데이터정보과학회지 Vol.4 No.-
We shall consider the trends of correlation coefficient between the smallest and largest observations in the Weibull model in the presence of an unidentified outlier, and derive the density functions of order statistics by the permanent theory.
Estimation of the parameter in an Exponential Distribution using a LINEX Loss
우정수,이화정,은갑숙,Woo, Jung-Soo,Lee, Hwa-Jung,Eun, Kab-Sook The Korean Data and Information Science Society 2002 한국데이터정보과학회지 Vol.13 No.2
A Bayes estimator of the scale parameter in an exponential distribution will be considered by a LINEX error, then the risk of the Bayes estimator using a LINEX loss will be compared with that of a Bayes estimator using a square error.
우정수(Jung Soo Woo),이창수(Chang Soo Lee) 한국데이터정보과학회 1993 한국데이터정보과학회지 Vol.4 No.-
We shall consider the trends of correlation coefficient between the smallest and largest observations in the Weibull model in the presence of an unidentified outlier, and derive the density functions of order statistics by the permanent theory.
Jackknife Parametric Estimation in the Two Parameter Exponential Model an Identified Outlier
Jung Soo Woo(우정수),Chang Soo Lee(이창수) 한국통계학회 1994 응용통계연구 Vol.7 No.2
소표본에서 하나의 확실한 이상점을 갖는 지수모형에서 permanent 이론을 도입하여 표본들의 순서통계량의 분포를 정확한 형태로 유도하고, 이 결과를 이용하여 가정된 지수모형의 위치모수와 측도모수에 대한 최우추정량과 그 짹나이프추정량을 편의와 평균제곱오차면에서 두 추정량의 소표본 성질을 비교하였다. When a single identified outlier in a small sample is presented, the small sample properties of the MLE`s and its jackknife estimators of the location and scale parameters in an assumed exponential model will be considered by the method of permanent theory.
Predictors of Distant Metastasis in Adenoid Cystic Cancer of Salivary Gland
Kang Woo Kim(김강우),Yeon Soo Kim(김연수),Kyoung Ho Oh(오경호),Min Woo Park(박민우),Jae-Gu Cho(조재구),Seung-Kuk Baek(백승국),Jeong-Soo Woo(우정수),Kwang-Yoon Jung(정광윤),Soon Young Kwon(권순영) 대한두경부종양학회 2014 대한두경부 종양학회지 Vol.30 No.1
배경 및 목적 타액선 선양낭성암종은 느린 성장 속도와 늦은 원격 전이를 특징으로 하는 드문 상피성종양이다. 본 연구는 다양한 임상 병리학적 변수를 통해 선양낭성암종의 원격 전이에 영향을 주는 인자를 조사하고자 하였다. 대상 및 방법 1999년 10월부터 2011년 12월까지 본원 이비인후과에서 타액선 선양낭성암종으로 진단되어 치료 받은 44명(남자 19명, 여자 25명)을 대상으로 원격전이를 유발하는 위험 인자를 조사하였다. 8명의 환자는 배제 기준에 따라 제외하였다. 환자의 평균 연령은 54세였다. 환자의 병리 보고서, 종양의 크기, T 병기, 수술 절제연의 종양 존재 유무, 신경 조직 침습, 림프절 전이가 조사되었다. 결 과 15명의 환자가 원격전이가 있었으며 21명은 원격 전이가 없었다. 원격 전이를 유발할 수 있는 여러 인자들을 비교 하였을 때, 원격 전이는 수술 절제연의 종양 세포 잔존(p=0.014), 종양의 크기(p=0.038), 진행된 T 병기(p=0.024) 가 통계적으로 유의하게 연관성이 있었다. 림프절 전이와 신경 조직 침습은 원격 전이와 연관이 없었다. 결 론 종양의 크기, 진행된 T 병기, 수술 후 절제연의 종양 세포 잔존은 원격 전이의 예측 인자로 생각된다. 따라서 이에 해당하는 환자의 경우 더욱 철저한 관리 및 경과 관찰을 요한다.
이정규(Jung Kyu Lee),조용민(Yong Min Cho),이진환(Jin Hwan Lee),우정수(Jeong-Soo Woo),조재구(Jae-Gu Cho) 대한두경부종양학회 2021 대한두경부 종양학회지 Vol.37 No.1
Papillary thyroid carcinoma (PTC) typically has a good prognosis, but it frequently metastasizes to the regional lymph nodes. Although survival impact of lymph node metastasis is not clear, complementary treatment is generally added after surgery when lymphatic metastasis exists. Several previous studies have reported that the multifocal PTC is associated with poor prognosis and requires selective neck dissection to prevent regional lymph node metastasis, but they are under controversy. In this study, we present a 24-year-old female patient, diagnosed as PTC with intrathyroidal spread and regional lymph node metastases. Intrathyroidal spread of PTC can only be observed microscopically and is believed to have the similar origin of unicentric multifocal PTC. As multifocal PTC is highly associated with regional lymph node metastasis and requires an additional treatment, PTC with intrathyroidal spread may follow a similar clinical course and treatment plan. Here we report the case with a brief literature review and expect its attribution to further academic interest of treatment choice.
조우성(Woo-Sung Cho),김우주(Woo-Joo Kim),유익원(Ik-One Yoo),황호연(Ho-Yeon Hwang),백승국(Seung-Kuk Baek),우정수(Jeong-Soo Woo),권순영(Soon-Young Kwon),정광윤(Kwang-Yoon Jung) 대한두경부종양학회 2007 대한두경부 종양학회지 Vol.23 No.2
Parathyroid gland tumor is an uncommon disease. The symptoms of parathyroid gland tumor appear in various features such as general weakness, renal stones, bone diseases and malignancies in some cases. We summarized the clinical features of 6 cases of parathyroid gland tumors with literatures.
편평세포암 동물 모델에서 고려인삼잎-다당체(MB40)의 항암치료효과
주은정(Eun Jung Joo),최 준(Jun Choi),정은재(Eun Jae Chung),홍석진(Seok Jin Hong),조재구(Jae Gu Cho),백승국(Seung Kuk Baek),우정수(Jeong Soo Woo),정광윤(Kwang Yoon Jung),권순영(Soon Young Kwon) 대한두경부종양학회 2009 대한두경부 종양학회지 Vol.25 No.1
Background and Objectives:Panax ginseng C.A. Meyer is a medical plant that has been widely utilized as a tonic and nutritional agent since ancient times in Korea. Ginseng has anti-metastatic property of cancer and immunomodulating activity. The novel acidic polysaccharide compound(MB40) was isolated from the leaves of Panax ginseng C.A. Meyer. To determine immunomodulating activities of MB40, we evaluate anti-cancer and anti-metastatic effects of MB40 in tumor bearing immune competent mice. Material and Methods:C3H mice were divided into three equal groups(Cisplatin treatment group, MB40treat- ment group, Cisplatin and MB40 treatment group) and were transplanted SCC(Squamous Cell Carcinoma) cells(2×106) to the lateral side of abdomen. From day 4 after transplantation, MB40 was administrated at dose of 10mg/kg, respectively, every other day by intratumoral injection. Cisplatin was systemically administrated at doses of 1mg/kg, respectively, every week by intraperitoneal injection. Results:5 days after administration, tumors can be palpated in every mice group. After 13 days of administra-tion, the mice group to which MB40 were administrated exhibited reduction in tumor size respectively, com-pared to cisplatin group. Overall status of mice such as body weight and activity were superior in MB40 group than cisplatin group. Conclusion:The result of this study indicates MB40 may have significant therapeutic effect and decreases com-plications induced by systemic chemotheraphy. MB40 may be developed as a novel and potent immunotropics to improve the cell immune system and anti-cancer drug for the treatment of cancer patients in head and neck squamous cell carcinoma.