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윤재영(Yoon Jae-Young),최흥관(Choi Heung-Kwan) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents the new simulation algorithms using network methods to analysis the steady-state train voltage distribution characteristics in ac auto-transformer fed railroads. In general, the supply system of railroads is composed of non-symmetrical and unbalance transmission line. Therefore, the general method using simplified old algorithms have the self-contradictory errors because the supply line of train railroads is completely unbalanced. In this paper, the simulation results of new developed algorithms is compared with those of EMTP to confirm the effectiveness.
Insulin 비의존형 당뇨병환자에서 Insulin 과 Gliclazide 병합요법의 효과에 관한 연구
윤재영(Jae Young Yoon),장현주(Hyun Ju Jang),안재수(Jae Su An),정동진(Dong Jin Chung),최종상(Jong Sang Choi),정민영(Min Young Chung),이태희(Tai Hee Lee) 대한내과학회 1990 대한내과학회지 Vol.39 No.2
N/A This study was performed on the acute effect of gliclazide and insulin combination in non insulin dependant diabetic (NIDDM) patients who had been in secondary failure with oral hypoglycemic agents treatment. Thirty minutes after premedication with 80 mg gliclazide or placebo, 11.25 unit of rapid acting recombinant human insulin were infused through the forearm vein for 45 minutes. Blood sugar measurements were made at 10-minute intervals, whereas serum insulin and C-peptide levels were measured at 30-minute intervals. The results were as follows: 1) There was no significant difference in the basal serum insulin concentration before the insulin infusion after placebo and gliclazide administration. Peak serum insulin concentration was attained 30 minutes after insulin infusion. The values were 312±26 μU/ml after placebo administration and 312±19 μU/ml after gliclazide adminisration. 2) Blood sugar levels of both groups fell to 130 mg/dl one hour after insulin infusion and remained at euglycemic state during the study. 3) Although both showed no difference in the basal C-peptide concentration, the serum C-peptide concentration of the gliclazide group was significantly higher than that of the placebo group. These results indicate that gliclazide combined with insulin may increase endogenous insu1in secretory capacity, even in the presence of secondary failure of oral hypoglycemic agents.
당뇨병성 말초신경장애에서의 Vibratory Perception Threshold
윤재영(Jae Young Yoon),정동진(Dong Jin Chung),최종상(Jong Sang Choi),안재수(Jae Su An),장현주(Hyun Ju Jang),정민영(Min Young Chung),이태희(Tae Hee Lee) 대한내과학회 1991 대한내과학회지 Vol.41 No.4
To assess the relation between vibratory perception threshold (VPT) and diabetic neuropathy, we checked beat-to-beat variation test (BBV) and VPT in 67diabetics (24insulin-dependent diabetes mellitus (IDDM), 43 non-insulin dependent diabetes mellitus (NIDDM)) and 35control subjects of similar age, and the following results were obtained. 1) In the control subjects, the VPT value was 7.2at the left 1st metacarpal area and 19.0at the left anterior superior iliac spine. The values in the lower extremities were higher than those of the upper extremities, and there were no differences between the left and right. 2) NIDDM patients had significantly higher VPT values at all sites, especially in the lower extremities, than those of the control subjects (p<0.01) (mean VPT values at the left and right lateral malleolus, medial malleolus, 1st metatarsal, and great toe were 26.8, 24.8, 25.1, 25.7, 20.2, 21.9, 18.9 and 18.3 in diabetics, and 16.5, 17.2, 17.3, 18.8, 14.5, 14.1, 12.1 and 11.0 in the controls, respectively). 3) The VPT values of NIDDM patients with symptoms of peripheral neuropathy were significantly higher in the upper and lower extremities (mean VPT values at the left and right radial and ulnar tubercle in the upper extremities were 14.2, 16.3, 12.2 and 15.8, respectively (p<0.05) and at the left and right lateral malleolus, medial malleolus, 1st metatarsal and great toe in the lower extremities were 31.4, 29.3, 30.1, 30.0, 23.6, 27.2, 22. 5 and 21.7 respectively (p<0.01)) than those of the control and asymptomatic subjects. 4) Among the asymptomatic NIDDM patients (n=16), the VPT values of 5 were higher than those of the others at olecranon, radial tubercle, and ulnar tubercle (p<0.05, respectively). However, the BBV showed no significant differences between them. 5) There were associations of the VPT values with age in the diabetic and control subjects (diabetic; r=0.52, p<0.001, control; r=0.74, p<0.001) and those in the lower extremities in NIDDM patients were associated with duration of diabetes (r=0.49, p<0.001) and age (r=0.43, p<0.01). 6) There were no relations between VPT values and angiographyically comfirmed retinopathy in NIDDM patients. 7) VPT values and BBV in IDDM patients were not significantly different from age matched control subjects (in BBV test; 14.4 in IDDM patients and 12.3 in controls). These results suggest that measurement of VPT is useful aid for early diagnosis of peripheral neuropathy in NIDDM patients, and diabetic peripheral neuropathy could be developed without automonic neuropathy.