와이블분포 하에서 베이지안 기법과 전통적 기법 간의 신뢰도 추정 정확도 비교

조형준,임준형,김용수 대한산업공학회 2016 대한산업공학회지 Vol.42 No.4

The Weibull is widely used in reliability analysis, and several studies have attempted to improve estimation of the distribution’s parameters. least squares estimation (LSE) or Maximum likelihood estimation (MLE) are often used to estimate distribution parameters. However, it has been proven that Bayesian methods are more suitable for small sample sizes than LSE and MLE. In this work, the Weibull parameter estimation accuracy of LSE, MLE, and Bayesian method are compared for sample sets with 3 to 30 data points. The Bayesian method was most accurate for sample sizes under 25, and the accuracy of the Bayesian method was similar to LSE and MLE as the sample size increased.

국내 2세 이하 영아에서 모체로부터 전달된 A형 간염 항체의 변화

조형준,이미희,김종현,허재균,이정현,김진택,정승연,강진한 대한감염학회 2001 감염 Vol.33 No.5

Background : Although the incidence of hepatitis A infection has dramatically declined in developed countries, it is still endemic in many of developing countries, and sporadic outbreak has developed in many middle classed endemic area. Many reports indicate that hepatitis A vaccine would have to be used for widespread immunization of infants, who live in endemic or non-endemic region, for eliminating this infection from circulation. Therefor, the optimal immunization schedule and dose of vaccine should be determined. Recent several studies suggested that high dose hepatitis A vaccination at the time of disappearance of maternal antibody promise protectable immunogenicity in infants. The purpose of our study to find out the prevalence and persistence of material HAV antibodies in Korean infants (below 2 years old age). Methods : 60 mother without past-history of hepatitis A, and 300 heathy infants without history of hepatitis A vaccination and intra-familial contact history of hepatitis A were enrolled in this study. The infants below 2 years old age were classified into 5 groups as following; 0∼3 months, 4∼6 months, 7∼9 months, 10∼ 12 months, 13∼24 months, and the number of each group were 60 and sex distribution of each group was equal. Positive rates of Anti-HAV were determined by ELISA. And comparisons of seroprevalence of anti-HAV between groups were analyzed by ANOVA repeated t-test. Results : The seropositive rate of maternal group was 81.7%, and the seropositive rate of 0∼3 months of age group was 43.3%. The seroprevalence of anti-HAV significantly declined after 4∼6 months of age, and reached below 10% at the age of 7∼9 months of age and the low rate of anti-HAV maintained until 2 years old age. And positive rates of anti-HAV showed no significant differences between males and females. Conclusion : The results of our study showed that the seroprevalence of anti-HAV significantly declined after 4∼6 months of age and the anti-HAV almostly disappeared at 7 ∼9 months of age. So, low seropositive rate of anti-HAV at 7 months of age may justify trials on infant vaccination in ]Korea. (Korean J Infect Dis 33:331∼337, 2001)

교통사고 예측모형의 개발 - 서울시의 교통사고 사망자수 예측을 중심으로 -

조형준 고려대학교 대학원 통계학과 1992 통계상담 Vol.7 No.2

산업이 발전함에 따라 나타나는 사회현상 중 교통사고의 증가는 현대사회의 중요한 문제점으로 지적되고 있다. 교통사고로 인한 피해 또한 날로 증가하는 추세에 있다. 따라서 이에 대한 문제해결을 위해 예측모형의 개발이 절실히 요구되고 있다. 서울시의 교통사고 사망자수를 예측하기 위해 선형회귀모형, ARIMA모형, 콤페르츠곡선모형, 로지스틱곡선모형 등을 고려해 보았다. 이 자료를 각각의 모형에 적합시켜 예측을 위한 가장 타당한 모형의 선택을 실시해 보았다.

생체주입용 Ni-Ti 합금의 시효특성(I)

조형준,이준희,박기룡,Cho, Hyung-June,Lee, Jun-Hee,Park, Ki-Ryoung 대한의용생체공학회 1989 의공학회지 Vol.10 No.3

The characteristics of aging of near-equiatomic Ni-Ti alloy has been studied by the three point bend test and the measurement of Differential Scanning Calorimetry(DSC). The DSC is used to measure precise transformation temperatures and the amount of thermal energy required for the corresponding phase transformation. The effort of hardness on aging treatment in saline solution of $37^{\circ}C$ was higher for the annealed than solution treated specimens. As the testing temperature inc- rease from under $M_f$ to above $A_f$ temperature, the elastic stiffness increased. Almost full recovery can be achieved after bending below Belo outer fiber strain. Total bend recovery decreased gradually as aging time and bend angle is increased.

다시 '문화운동' 으로서 출판을 생각한다

조형준,Jo, Hyeong-Jun 대한출판문화협회 1999 출판저널 Vol.269 No.-

형광 공초점 현미경의 side-lobe 감소에 대한 연구

조형준,최치규,김두철,유영훈 濟州大學校 基礎科學硏究所 2002 基礎科學硏究 Vol.15 No.2

구면렌즈를 사용한 광학 관측계의 경우 관측계 자체의 문제뿐만 아니라 시료의 두께 및 굴절률에 따라 위상오차에 의한 side-lobe가 발생한다. 특히 형광 공초점 현미경의 경우 시료 제작시 사용되는 형광물질, 증류수, 식염수 등의 불규칙적인 사용으로 위상오차에 의한 side-lobe의 발생이 매우 심각하다. 본 연구에서는 시료의 특성에 따른 side-lobe를 최소화하기 위하여 Herschel 조건을 도입하였다. 또한 형광 공초점 현미경을 구성하여 Herschel 조건에 의한 위상 보정을 함으로써 side-lobe가 최소화됨을 확인하였다. The effects of side-lobe on the axial response in fluorescence type confocal microscope have been investigated by computer simulation and experiment. The axial response becomes broad and asymmetric with side-lobes, and the peak intensity of the image was greatly reduced because the Herschel condition was violated. We found the condition for the minimized of side-lobe with the Herschel condition according to change of optical path altering the distance from sample to objective lens and from objective lens to image. From the results of computer simulation and experiment, we found that the distribution of intensity was shifted, the peak of intensity being increased and the axial response was symmetric after compensating a phase error according to thickness was increased. From analysis of this results, an optimized axial response can be achieved by minimizing side-lobe and side-lobe can be minimized by compensating phase error.

반복 용체화처리에 의해 조직제어된 Ti-6Al-4V 합금의 인장성질

조형준,임영호,이준희 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

The purpose of the present study is to improve the tensile properties of the beta-quenched with little strain due to processing, only by heat treatment. Control of volume fraction, morphology and distribution of alpha is of great importance in achieving desired mechanical properties with a good combination of strength and elongation. Accordingly, a cyclic solution treatment has been proposed to obtain bimodal structures of equiaxed and acicular alphas. The microstructures of the specimens subjected to the Cyclic Ⅲ solution treatment consisted of nearly equiaxed and acicular alphas with the matrix of the tempered martensite. As a result, the tensile properties became almost equivalent to the specimens of the double solution treatment in the α+β region.

유양돌기염과 정맥동 혈전증이 합병된 급성 중이염 환아 1예

조형준,박경호,이정현,김진택,정승연,강진한 대한감염학회 2001 감염 Vol.33 No.5

Since antibiotics have played an important role in the management of otitis media and its complications, lack of familiarity among the present generation of physicians with otogenic intracranial complications (meningitis, brain abscess, extradural abscess, sinus thrombosis), once very common, can lead to late diagnosis and treatment. The intracranial complications have declined in the incidence, but still cause significant morbidity and mortality. We experienced a case of mastoiditis and transverse sinus thrombosis as complications following acute otitis media, diagnosed by CT and brain MRI. We observed good clinical responses in this cases after treatment of intravenous antibiotics therapy and ventilating tube insertion. We report this case with brief review and related literatures. (Korean J Infect Dis 33:371∼375, 2001)

반복적 구토 및 복통으로 가성 장 폐쇄로 진단받은 환자 1례

조형준,이진용,김덕곤,김기훈,Cho, Hyung-Jun,Lee, Jin-Yong,Kim, Deog-Gon,Kim, Ki-Hoon 대한한방소아과학회 2004 대한한방소아과학회지 Vol.18 No.1

Objectives: Transverse myelitis is a rare neurological disorder that is part of a spectrum of neuroimmunologic diseases of the central nervous system. A patient was hospitalized with intestinal pseudoobstruction(poor oral feeding, vomiting, abdominal pain, constipation) secondary to Transverse myelitis. We treated her with Oriental medical approach and obtained satisfactory result. Methods: The Herbal medicine(Bihwa-eum), Acupuncture, Moxibustion therapy were applied for improving the deficiency of energy of the spleen and stomach, regulate the flow of vital energy. Results: After treatments, Patient's vomiting frequency is decreased and abdominal pain is improved and oral feeding is available. She gains in weight continuously. Conclusion: The authors thought that Bihwa-eum is effective to vomiting and abdominal pain due to intestinal pseudoobstruction. The more study is needed.

국립기상과학원 ARGO 프로그램 현황 및 동해 해양 변동성 분석

조형준,박종숙,임병환,추성호,장필훈,박영산 한국기상학회 2015 한국기상학회 학술대회 논문집 Vol.2015 No.10