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배경태(Gyeong-Tae Bae),김귀남(Gwi-Nam Kim),최부영(Boo-Young Choi),문홍만(Hong-Man Moon),노정필(Jung-Pil Noh),허선철(Sun-Chul Huh) 한국해양공학회 2015 韓國海洋工學會誌 Vol.29 No.1
To improve the accuracy of a machine, research needs to be conducted on the relationship between the output variables and design variables of a spindle-shaped part from the thermal and static viewpoints. Therefore, research was carried out by examining the correlation of each variable to find the optimum conditions. Moreover, DOE (design of experiments) was extensively used. The model used in this study was a grinding spindle to which a hydrostatic bearing was applied. This model was used in a preliminary analysis based on the experimental results of the previous studies. The influences of the output variables and design variables were compared through a main effect analysis. Generated response surfaces were applied to the Kriging model. To optimize the model, a screening method was selected. In comparison with the initial model, the deformation of the optimized model designed by DOE decreased by 4.1 ㎛, while the thermal deformation decreased by 1.2 ㎛. Therefore, it was efficient to design a spindle-shaped part through DOE to improve the accuracy of the machine.
배경태(Gyeong Tae Bae),허선철(Sun Chul Huh),최부영(Boo Young Choi),문홍만(Hong Man Moon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The hydrostatic bearings have a relatively small run-out comparing to its shape error by fluid film effect in hydrostatic state as like pneumatic bearing and have a high stiffness, load capacity and damping characteristics. In this study, we could confirm the reliability of the analysis by assessing the thermal characteristics through measurement of the grinding machine temperature and thermo-structural analysis and comparing the measured thermal deformation with the result of the analysis, and could identify the overall thermal characteristics of the grinding machine
갑상선침생검으로 확인된 아급성 갑상선염 26예의 임상적 고찰
장필식 ( Jang Pil Sig ),김의현 ( Kim Ui Hyeon ),배경태 ( Bae Gyeong Tae ),권규돈 ( Kwon Gyu Don ),이종곤 ( Lee Jong Gon ),정의룡 ( Jeong Ui Lyong ),오용구 ( O Yong Gu ),박형근 ( Park Hyeong Geun ) 대한내과학회 1990 대한내과학회지 Vol.38 No.6
N/A The clinical features and laboratory findings of 26 patients with histologically-proven subacute thyroiditis were examined from March 1984 to December 1988 at the Masan Koryo Hospital. The results were as follows: 1) All 26 patients with subacute thyroiditis were women, and the age distribution showed the peak incidence to be between the third and fourth decades(average age : 40 years). 2) The seasonal distribution showed the peak incidence to be between summer(34.6%) and autumn(30.8%). 3) The chief complaints were frequent anterior neck pain(69.2%), anterior neck swelling(23.1%) and fever(7.7%). The peak time from onset was 1-2weeks(50.0%). 4) On physical examination, 15 cases were nodular goiter(57.7%), and 11 cases were diffuse goiter(42.3%). All cases except one had moderate or severe tenderness. All 26 cases had a firm or hard consistency. 5) The mean value of ESR was elevated to 40.9 mm/ hr, and 12 cases(46.2%) were of mild or moderate hyperthyroid status. The serum thyroglobulin level was checked in 19 patients, and the mean value was elevated to 169.1 ng/ml. The positive rates for antithyroglobulin and antimicrosomal antibody were 1/24 and 3/24, respectively. 6) The thyroid scans were classified into the follwing groups: 15 cases(57.7%) showed both lobes nearly nonvisualized, 10 cases(38.5%) showed one lobe nearly nonvisualized, and one case(3.8%) showed both lobes slightly diffuse and enlarged. 7) Among the 26 cases, four were checked with radioactive iodine uptake(RAIU). The value was markedly depressed from 1-4% in all cases except one. 8) With aspirin or prednisolone therapy, the pain subsided and the goiters were reduced within several days.