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윤규상 ( Kyeu Sang Yoon ),이미림 ( Mi Rim Lee ),이재철 ( Jae Chul Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.8
We investigated the cryogenic temperature plasticity of a bulk amorphous alloy. Experiments showed that as temperature decreases, the plasticity of the alloy increases, such that the alloy exhibited ~20% of plastic strain when tested at -196℃. This enhancement in the plasticity at cryogenic temperatures was associated with the formation of abundant shear bands distributed uniformly over the entire surface of the sample. Nonetheless, the serrations, the characteristic feature of the plastic deformation of amorphous alloys, were unclear at -196℃. In this study, both the enhanced plasticity and the unclear serrations exhibited by the amorphous alloy at cryogenic temperatures were clarified by exploring shear banding behaviors in the context of the velocity and the viscosity of a propagating shear band.
윤규상(Kyusang Yoon),최재호(Jaeho Choi),허건수(Kunsoo Huh) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In this study, we present a method for producing more accurate results by changing the weights of each sensor according to the surrounding environment, beyond utilizing multiple models and multiple sensors. In multi-sensor fusion, the weight of each sensor varies depending on the accuracy of each sensor. Covariance intersection and modified version widely used because it is useful when one cannot know the exact value of cross covariance. However, they only get fixed weights by initial parameters, making it difficult to cope with environmental changes: climate, road geometry, and driving conditions. This innate limit causes the location error of targeting vehicles. To overcome this, our method learns various information obtained from sensors through multimodal learning and performs data fusion that adapts to various situations in real time. Proposed method effectively recognizes the surrounding environment and shows higher accuracy, as well as real-time computational capabilities. This method has been verified with the actual vehicle data.
이재철 ( Jae Chul Lee ),김현수 ( Hyun Su Kim ),윤규상 ( Kyeu Sang Yoon ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.11
Structural change in an amorphous alloy was measured by applying a load below the global yield stregth at ambient temperatures. It was observed that the magnitude of the apparent structural change occuring in the amorphous alloy is determined by the compatative relationship between the stress-induced disordering process and the thermally-activated relaxation process. Structural disorder was observed to take place even at a stress well below the global yield, and the degree of the disorder was increased abruptly at the earlier stage of loading and saturated with time. In the mean time, unlike the previous belief, the relaxation process was observed to occur even at embient temperatures, and the degree of the relaxation was observed to increase linearly with time. The analytical equation predicting the structural change was proposed.
The paradoxical effect of aldosterone on cardiovascular outcome in maintenance hemodialysis patients
최선령,Lee Young-Ki,Park Hayne Cho,김도형,조아진,Kim Juhee,윤규상,노정우,강민경 대한신장학회 2022 Kidney Research and Clinical Practice Vol.41 No.1
Background: Patients with end-stage kidney disease face increased risk of cardiovascular events, and left ventricular diastolic dysfunction (LVDD) contributes to the high occurrence of cardiovascular mortality (CM). Although a high serum aldosterone (sALD) level is involved in the development of cardiovascular complications in the general population, this association is unclear in patients undergoing hemodialysis. We aimed to determine the impact of sALD on LVDD and CM among hemodialysis patients (HDPs).Methods: We performed a prospective cohort study of maintenance HDPs without cardiovascular disease. The patients were divided into two groups according to the median level of sALD. All patients underwent baseline echocardiography to evaluate diastolic dysfunction (E/e´ ratio > 15). The LVDD and CM rates were compared between the high and low aldosterone groups.Results: We enrolled a total of 60 adult patients (mean age, 57.9 ± 12.1 years; males, 30.0%). The low aldosterone group had an increased left ventricular diastolic dimension compared with the high aldosterone group (52.2 ± 8.4 mm vs. 50.3 ± 5.2 mm, respectively; p = 0.03). Low log-aldosterone (odds ratio [OR], 0.40; 95% confidence interval [CI], 0.19–0.86) and large left atrial dimension (OR, 1.31; 95% CI, 1.11–1.54) were independent risk factors for LVDD at baseline. In addition, Cox regression analysis demonstrated that low sALD was an independent predictor of CM in HDPs (hazard ratio, 0.46; 95% CI, 0.25–0.85; p = 0.01) during follow-up.Conclusion: Low sALD was not only associated with LVDD but was also an independent predictor of CM among HDPs regardless of their interdialytic weight gain.