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수명이 대수정규분포를 따르는 제품에 대한 경제적인 신뢰성 입증시험 설계
권영일(Young Il Kwon) 한국신뢰성학회 2012 신뢰성응용연구 Vol.12 No.1
Reliability demonstration tests with zero-failure acceptance criterion are most commonly used in the field of reliability application since they require fewer test samples and less test time compared to other test methods that guarantee the same reliability with a given confidence level. For products with lognormal lifetime distribution, an economic zero-failure test plan is developed that minimizes the total cost related to perform a life test to guarantee a specified reliability of a product with a given confidence level. A numerical example is provided to illustrate the use of the proposed test plan.
권영일(Kwon, Young Il) 한국신뢰성학회 2010 신뢰성응용연구 Vol.10 No.1
In general, the performance of a component degrades as time goes by and failure of a component occurs when the performance degradation reaches a pre-specified level. It is difficult to obtain the failure time distribution data or the necessary number of failure data especially for the metal or machine part. Thus, a design of reliability qualification test based on performance distribution is more effective than failure time distribution. In this study, a performance-based reliability qualification test is developed and a numerical example is provided to illustrate the use of the developed reliability qualification test. This approach could be applied to many kinds of metal or machine part whose magnitude of strength could not be evaluated during at any random points but judgement can be made by only failure of the part. Besides, it is also possible that any parts which have a similar failure characteristics could be applicable to the developed reliability qualification test.
Total antioxidant status (TAS) 참고치 및 고콜레스테롤혈증, 당뇨병과의 관련성에 관한 연구
권영일 ( Young Il Kwon ),서은주 ( Eun Ju Seo ),홍효선 ( Hyo Sun Hong ),안희은 ( Hee Eun Ahn ),박찬호 ( Chan Ho Park ),노명희 ( Myung Hee Rho ) 대한임상검사과학회 1999 대한임상검사과학회지(KJCLS) Vol.31 No.2
Introduction : The Object of this study is to investigate the reference ranges of total antioxidant status(TAS) according to age and sex in korea. The human body is constantly under attack from free radicals. Free radica1s are highly reactive molecules and once formed, attack cell structures with the body. As a resu1t, free radicals have been implicated in numerous disease. In hea1thy individua1s, the antioxidant system defends tissues against free radica1 attack. Methods and materials : We measured the tota1 antioxidant status of 90 norma1 group, 30 diabetes group and 30 hypercholesterolemia group. (The each group sex ratio : ha1f to ha1ij For each test, age and sex related variations were assessed and reference values were estimated for three different age groups.(below 20, 21-40, above 41) TAS measured by Randox Tota1 Antioxidant reagent and Hitachi 7150. Results : ’fhe reference va1ues according to age were 0.930- 1.332mmolfL in below 20 years of age, 1.007 -1.391mmolfL in 21-40 years of age and 0.995- 1.295mmolfL inabove 41 year of age and showed statistica11y significant difference.(P<0.05) The Reference ranges of tota1 age group, ma1e and fema1e group were 0.991- 1.343mmolfL, 1.038- 1.370mmolfL, and 0.977 -1.285mmolfL respectively. Between the ma1e and fema1e group were statistically signficant difference.(P<0.05) The TAS means of diabetes and hypercholesterolemia were 1.26mmoljL and 1.23mmoljL respectively. TAS values of hypercholerterolemia an normal group were no significant difference whereas diabetes and normal group were significant difference.(P<O.OOl) Conclusions : We established that reference ranges were analyzed age and sex related variations for total antioxidant status. Between experimental groups showed generally significant differences. In the future, correct diagnosis of disease induced free radicals need to measure total antioxidant level and each antioxidants.
와이불수명분포를 갖는 제품의 신뢰성인증시험에서 형상모수의 영향분석
권영일(Kwon, Young Il) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.3
In the fields of reliability application, the most commonly used test methods for reliability qualification are zero-failure acceptance tests since they require fewer test samples and less test time compared to other test methods that guarantee the same reliability with a given confidence level. Usually values of shape parameters are assumed to be known in designing reliability qualification tests for Weibull lifetime distribution. It is important to select correct values of shape parameters to guarantee the specified reliability with given confidence level exactly. The effect of using wrong values of shape parameters in designing reliability qualification test for products with Weibull lifetime distribution is examined and selecting proper values of shape parameters for conservative reliability qualification is discussed.
권영일(Kwon young-il) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1
레이저 슬라이드 마킹 시스템은 기존의 수작업으로 수행하던 작업 공정을 대체할 수 있으므로 병원의 임상병리과 등 관련 전문가들이 적극적으로 도입을 검토하고 있다. 현재 국내 병원에서는 IT기술의 발달로 각종 진단 결과의 처리에서 병원 내의 물류에 이르기까지 다양한 분야에서 전산화가 이루어지고 있다. 이에 따라 각종 검사 업무를 담당하고 있는 임상병리 부서에서도 검사 장비의 전산화, 자동화의 노력이 진행되고 있으며, 검사 업무의 핵심장비인 레이저 슬라이드 마킹 시스템을 도입하여 사용하려는 수요가 증가하고 있다. 레이저 슬라이드 마킹 시스템의 국내 시장규모는 2008년 2억5천만원이고, 2012년 17억5천만원으로 예상된다. 레이저 슬라이드 마킹 시스템은 2005년도에 국내에 처음으로 도입되었고, 제품수명 주기상 도입기에 해당하며, 향후 성장 가능성이 매우 높을 것으로 전망된다. Laser slide marking systems are being considered by the staffs of clinical laboratories in hospitals as the main potential substituent for the conventional manual processes of the laboratory works. Many of the processes in domestic hospitals such as operations of test equipments in clinical laboratories and physical distributions in hospitals are being computerized due to the recent development of information technologies. The clinical laboratories in charge of inspection processes are putting their efforts on the computerization and automation of the test equipments, which increases the demand for the usage of laser marking slide systems which is the main component of the inspection works. The domestic market size of the laser slide marking systems is expected to be 250 million won in 2008, which is believed to increase to 1.75 billion won in 2012. The laser slide marking system was first introduced to domestic hospitals in 2005. It's product life cycle is currently on the early stage, and it is believed to have a very high growth potential in the future.