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압입 표면 변위를 이용한 적합직교분해 딥러닝(POD-DL) 기반의 소성 물성 예측
강영균(Yeong Gyun Kang),이승원(Seung Won Lee),유경현(Kyung Hyun Yoo),이철수(Cheol Soo Lee) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.1
본 연구의 목적은 압입으로 발생된 표면 변위를 이용해 재료의 소성 물성을 예측하는 것이다. 이는 재료 물성에 따라 압입 표면 변위가 서로 다른 양상을 보이기 때문에 가능하다. 표면 변위는 비접촉식 계측방식인 디지털 이미지 상관법을 이용하여 측정할 수 있다. 물성 예측에 필요한 소성 물성별 표면 변위 데이터베이스 수치 시뮬레이션을 통해 구축한다. 소성 물성은 항복강도와 변형경화지수로 표현된다. 데이터베이스는 딥러닝 데이터로 사용되기 위해 적합직교분해를 통해 압축된다. 적합직교분해는 영향도에 따라 데이터를 압축하는 전처리 기법이다. 학습된 딥러닝 모델은 압입 표면 변위로 소성 물성을 예측한다. 이를 통해 항복강도는 평균 오차율 2.7%, 변형경화지수는 평균 오차율 5.7% 이내에서 예측되었다. The purpose of this study is to predict the plastic properties of material using surface displacement caused by indentation. Depending on the material properties, the surface displacement exhibits different aspects. The surface displacement can be measured using a digital image correlation method, which is a noncontact measurement method. The surface displacement database for each plastic property necessary for property prediction was constructed through numerical simulation, with plastic properties represented by yield strength and the strain hardening exponent. The database was compressed through proper orthogonal decomposition (POD) for deep learning data. POD is a preprocessing technique that compresses data according to the greatest influence. The trained deep learning model predicts plastic properties by indentation surface displacement. By using this technique, the yield strength was predicted within an average error rate of 2.7%, and the strain hardening exponent was predicted within an average error rate of 5.7%.
Papaverine이 단일 심근세포의 막전류에 미치는 영향
유경현,심태섭,방효원 중앙대학교 의과대학 의과학연구소 1991 中央醫大誌 Vol.16 No.4
Ventricular myocytes of guinea-pig were isolated by means of collagenase digestion in order to investigate the effects of papaverine on the membrane currents in them. After formation of a gigaseal with patch microelectrodes, membrane currents were recorded from single ventricular myocytes in a whole cell mode of patch-clamp technique. For membrane currents recording, electrodes were filled with Cs-solution. Results were as follows: 1. Slow inward calcium was reduced by papaverine dose-dependently. 2. No significant changes were observed in the steady-state inactivation. 3. Recovery time of the calcium currents prolonged in high concencial papaverine. 4. Fast inward sodium currents showed no noticeable changes with papaverine treatment. From these results, it is strongly suggested that the effects of papaverine on the membrane currents in the single ventricular myocytes may be attributable to its antagonistic action on the calcium channel rather than its inhibitory effect on the phosphodiesterase activity.