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허만옥 大韓小兒齒科學會 1978 大韓小兒齒科學會誌 Vol.5 No.1
Directed by Prof. Jong Gap Lee. D.D.S., M.S., PH. D The author studied on the Simplified Oral Hygiene Index in the handicapped children, who are housed by several rehabilitation institution age from 3 to 17 year in Seoul area and 439 normal children as a control group. The obtained results are as follows: 1) In the Oral Hygiene Index(OHI), The handicapped children showed remarkable increment compared to normal children(The Index score was 2.00 in cerebral palsy children, 1.94 in poliomyelitis, 1.79 in other`s diseased children, in 1.01 in normal children) and the score was increased as age increment. 2) In the OHI of the handicapped children, male was higher than female. 3) Dental calculus deposition in the handicapped children was severe in the lower anterior teeth and least in the upper anterior teeth. 4) Dental calculus Index of the handicapped children was comparatively higher in the region which had higher food debris index. 5) As the conculusion of this study, we found that continuous and active dental enlightenment and treatment for oral health in the handicapped children are necessary.
정다운(DaUn Jeong),윤희성(Huisung Yun),곽초롱(Chorong Kwak),이승헌(Seunghun Lee),허만옥(Manog Hur) 한국신뢰성학회 2012 신뢰성응용연구 Vol.12 No.1
The quality of a part has directly effect on part reliability. In the basis of MIL-HDBK-217F model, it is the determined rule that part’s quality level should follow its nominal one written in its specification. If quality information is unknown, quality level of the part should be determined as ‘Lower’. However, the prediction model is said to be short in reflecting parts applying ‘state-of-the-art’ technology and result in over-estimated failure rate by some reliability-related authorities or research institutes. In this study, the reliability prediction results by the model of MIL-HDBK-217F and Telcordia SR-332 are compared and analyzed to verify whether the statement is reasonable or not.
무기체계 신뢰도 예측시 임무주기 적용 방안에 대한 연구
윤희성(Huisung Yun),정다운(DaUn Jeong),이은학(Eunhak Lee),강태원(Taewon Kang),이승헌(Seunghun Lee),허만옥(Manog Hur) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.4
Duty cycle is determined as the ratio of operating time to total time. Duty cycle in reliability prediction is one of the significant factors to be considered. In duty cycle application, non-operating time failure rate has been easily ignored even though the failure rate in non-operating period has not been proved to be small enough. Ignorance of non-operating time failure rate can result in over-estimated system reliability calculation. Furthermore, utilization of duty cycle in reliability prediction has not been evaluated in its effectiveness. In order to address these problems, two reliability models, such as MIL-HDBK-217F and RIAC-HDBK-217Plus, were used to analyze non-operating time failure rate. This research has proved that applying duty cycle in 217F model is not reasonable by the quantitative comparison and analysis.