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PZT-Induced Lamb Waves and Pattern Recognition for On-Line Health Monitoring of Jointed Steel Plates
Roh, Yong Rae,Kim, Don Young,Yang, Seung Han,Park, Seung Hee,Yun, Chung Bang Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.321 No.-
<P>This paper presents a non-destructive evaluation (NDE) technique for detecting damages on a jointed steel plate on the basis of the time of flight and wavelet coefficient, obtained from wavelet transforms of Lamb wave signals. Probabilistic neural networks (PNNs) and support vector machines (SVMs) were applied for pattern classification. In this study, the applicability of the PNNs and SVMs was investigated for the damages in and out of the Lamb wave path. It has been found that the present methods are very efficient in detecting the damages simulated by the loose bolts on the jointed steel plate.</P>
( Young Eun Chung ),( Soo-young Oh ),( Jung-sun Kim ),( Cheong-rae Roh ),( Suk-joo Choi ),( Ji-hee Sung ),( Yun-sun Choi ),( Yejin Kim ),( Sir-yeon Hong ) 대한산부인과학회 2022 대한산부인과학회 학술대회 Vol.108 No.-
Objective: To characterize perinatal and infant long-term outcomes in preterm-delivered intrauterine growth restriction according to the specific placenta pathologic findings. Methods: This study includes singleton pregnancies with fetal growth restriction (FGR) delivered between 22+0 and 36+6 weeks from 2011 to 2018 in our institution. Placenta pathology was assessed according to findings of maternal vascular malperfusion and fetal vascular malperfusion by Amsterdam criteria. We retrospectively examined perinatal outcomes including gestational age at delivery (GAD), severe preeclampsia, neonatal mortality and infant long-term outcomes including postnatal growth and delayed neurodevelopment. Results: There were 383 consecutive preterm FGR during the study period. After exclusion of unavailable placenta pathology(n=4) and major anomaly(n=25), 354 pregnancies finally included. Earlier gestational age at delivery was significantly associated with most findings of maternal vascular malperfusion including villous infarct, increased syncytial knot, acute atherosis of basal plate arteries and/or decidual arterioles (p<0.001 for all). Severe preeclampsia was also related to findings of fetal vascular malperfusion as well as maternal vascular malperfusion. Neonatal mortality was associated with hyalinized avascular villi (odds ratio (OR)=5.118, 95% confidence interval (CI): 1.727-15.166). Conclusion: This study reveals that specific placenta findings of maternal vascular malperfusion and fetal vascular malperfusion are related to perinatal and infant long-term outcomes in preterm FGR, emphasizing the importance of systematic and detailed placental pathology examination.