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崔德俊 우석대학교 의과대학 1969 우석의대잡지 Vol.6 No.1
Graphic pattern and curves of serum protein partitioned by electrophoretic method of analysis was observed among women in normal pregnancy, puerperium and those with toxemia of pregnancy. The results : 1) The graphic pattern of serum protein revealed characteristic patterns which could not be elicited by quantitative method. 2) The graphic pattern of serum protein in pregnant women presented tall, slender and symmetrical peak of beta curve. 3) A curve in which alpha 2 and beta zone was poorly separated in women with toxemia of pregnancy. 4) A prominently tall and slender gamma peak was observed in blood serum collected from the umbilical cord of the newborn.
박승규,최덕준,장희석 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
With increasing demand of micro mechanism and precision engineering, tolerance technology play crucial role in mechanical engineering. The ability to interpret tolerance specifications ensures manufacturer interchangeability and standardizing. Nowadays, most engineering drawing jobs are preformed by CAD software. Hence there com increasing need for interactive tools of tolerance analysis with CAD software. This study is to build graphic interactive tools for tolerance design in conjunction with CAD software. This graphic tools provide prompt menu bar by which we can input tolerance specifications of the specified geometry in the CAD screen. With the input tolerance data, this software perform Monte-Carlo simulation and tolerance analysis results are also displayed in the screen. This approach provides and promissing tools for tolerance analysis when use commercial CAD software.
링 프로젝션 돌기의 용입정도가 ECV 조립공차에 미치는 영향
장희석,원웅연,최덕준,김종호,김진상,남택현,강희종,Chang, Hee-Seok,Won, Woong-Yeon,Choi, Duk-Jun,Kim, Jong-Ho,Kim, Jin-Sang,Nahm, Tak-Hyun,Kang, Hee-Jong 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.1
Due to the inherent dimensional uncertainty, tolerances accumulate in the final assembly. Tolerance accumulation has serious effect on the performance of ECV assembly. This paper proposes a method of tolerance accumulation analysis using Monte Carlo simulation, which includes welding process in assemble process. This method can predict the final tolerance distributions of the completed assembly with the prescribed statistical tolerance distribution of each part to be assembled. With the inclusion of welding, another dimensional uncertainties due to partial melting is to be accounted as well. Partial melting of projection height was included in the tolerance propagation analysis. Verification of the proposed method was performed by making use of Monte Carlo simulation. Monte Carlo simulation results showed promising results in that we can predict the final tolerance distributions in advance before actual assembly process of precision machinery.
왕상(Xiang Wang),강은지(Eunji Kang),장희석(Heeseok Chang),이수진(Soojin Lee),최덕준(Dukjun Choi),국무성(Musung Guk),홍태호(Taeho Hong),강희종(Heejong Kang),안영재(Youngjae Ahn) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.1
Tolerance accumulation has serious effect on the performance of an assembled body. This paper proposes the method which analyzes tolerance accumulation using Monte Carlo Simulation. This method can predict tolerance distribution of fully assembled body using the dimensional tolerance distribution of each part to be assembled. In this analysis, it is assumed that the tolerance of each part has the nominal distribution or uniform distribution. This analysis method is applied to ECV(External Control Valve), and the accumulated tolerance of the fully assembled ECV is obtained from the analysis. The results show that initial tolerance given to each part do not meet the design requirement of ECV. Hence, the tolerances of each part are modified and the additional analysis with the modified tolerances yields the results which satisfy the design requirements of ECV.