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이승천,최병수,Lee, Seung-Chun,Choi, Byung Su 한국통계학회 2013 응용통계연구 Vol.26 No.5
Tobin (1958)에 의해 처음 소개된 절단 회귀모형에서 베이지안 추정은 최대가능도 추정보다 실제값에 가까운 것으로 알려져 있으나 베이지안 방법론이 구간추정 문제에 있어서도 성공적으로 작동할 수 있을 지에 대해서는 알려진 바가 없다. 일반적으로 베이지안 방법론에서 사전분포는 분석자의 사전정보를 반영하기 때문에 주관적인 분석이 될 수 밖에 없는데, 이렇게 주관적인 분석에서는 빈도학파들이 요구하는 기준을 따르기 어렵다. 그러나 무정보사전분포는 때때로 빈도학파적 특성을 갖는 베이지안 추론을 가능하게 한다. 본 연구에서는 절단 회귀모형에서 무정보사전분포에 의한 베이지안 신뢰구간의 빈도학파적 특성을 살펴보고 최대가능도 추정 신뢰구간과 포함확률을 비교한다. 이를 통해 최대가능도 추정의 표준오차가 과소 추정되고 있음 밝힌다. The Bayesian method can be applied successfully to the estimation of the censored regression model introduced by Tobin (1958). The Bayes estimates show improvements over the maximum likelihood estimate; however, the performance of the Bayesian interval estimation is questionable. In Bayesian paradigm, the prior distribution usually reflects personal beliefs about the parameters. Such subjective priors will typically yield interval estimators with poor frequentist properties; however, an objective noninformative often yields a Bayesian procedure with good frequentist properties. We examine the performance of frequentist properties of noninformative priors for the Tobit regression model.
WTB(Wire Train Bus)에서의 통신 속도 개선에 관한 연구
전성준(Jeon Seong-Joon),최병수(Choi Byung-Su),심자현(Shim Ja-Hyun),손강호(Shon Kang-Ho) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
TCN define that WTB's network speed is 1Mbps. However, Network speed need to be improved as number of data is increased and near future train's requirement require more high speed between trains. therefore we studied implementation of 2 Mbps speed on WTB. we also made new communication board for more stable test environment. they have dual communication channel and switch over logic. Software has function to set clock value for 2 Mbps. we also implement logic for Manchester Encoder/Decoder logic that is required by WTB specification. Existing WTB network speed is 1Mbps and Data Period is 25㎳ and Basic period is 2 ㎳. In this study, we test WTB network speed is 2Mbps and Data Period is 12㎳ and Basic period is 1 ㎳. This study is about implementation how we can improve WTB network speed. Accordingly, I suppose that this thesis will be utilized to implement and test more stable and high speed communication in high speed train
야간 응급실 당직의사의 안외상환자 처치의 적절성에 대한 고찰
신환호,온영훈,최병수 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.1
Proper management in ocular injured patients is important in prognosis of visual acuity. The authors performed census on the management and treatment of ocular injured patients by 63 doctors in emergency room of 63 hospitas and clinics at night in Seoul. The data were obtained during 2 month period from Nov. 1 1994 to Jan. 31 1995. Interns(62%) were common doctors in emergency room at night. Work period ranged from 1 to 6 months in most cases(33%). Ocular injuries were included: lid laceration(33%), periorbital contusion(24%), corneal laceration(10%), subconjunctiveal hemorrhage(8%). The common management in the emergency room was primar repair(48%). The majority of severe ocular injured patients, such as corneal laceration and scleral laceration, was referred to teh university hospitals(75%). When patients were referred, 8 doctors notified to the ophthalmologist of referred hospitals. The common time inteval between visit of emergency room and transfer of patients was within 30 minutes. These results suggest that doctors in emergency room were passive and inappropriate managements to ocular injured patients. And we think that education is needed to medical students, general physicians, interns and residents.
Hourglsaa 형 담낭에 발생한 석희유 담즙 1 예
두창준,변종훈,신현자,송국진,전인석,김웅봉,최병수 대한내과학회 1988 대한내과학회지 Vol.35 No.4
Milk of calcium bile or limy bile is a rare condition in which the gallbladder is filled with a thick, pastelike, radiopaque material. It is almost entirely composed of calcium carbonate. The mechanism by which bile turns into limy bile is not well understood, Hewever, complete cystic duct obstruction by gallstones is believed to be a prerequisite for the development of limy bile. Hourglass gallbladder is a deformity of the gallbladder with a constriction or midtransverse septum between the infundibulum and body. Stasis proximal to the constriction probably contributes to calculous formation and may provoke cancerous alternations. This is the account of a case of Hourglass gallbladder associated with limy bile at the fundal compartment in a 43-year-old man who had vague abdominal pain in the right upper quadrant and indigestion for two years. The literature on this subject is briefly reviewed.