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Application of deep learning method to Reynolds stress models of channel flow based on reduced-order modeling of DNS data 被引量:14
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作者 Zhen Zhang xu-dong song +4 位作者 Shu-ran Ye Yi-wei Wang Chen-guang Huang Yi-ran An Yao-song Chen 《Journal of Hydrodynamics》 SCIE EI CSCD 2019年第1期58-65,共8页
Recently,the methodology of deep learning is used to improve the calculation accuracy of the Reynolds-averaged Navier-Stokes (RANS) model.In this paper,a neural network is designed to predict the Reynolds stress of a ... Recently,the methodology of deep learning is used to improve the calculation accuracy of the Reynolds-averaged Navier-Stokes (RANS) model.In this paper,a neural network is designed to predict the Reynolds stress of a channel flow of different Reynolds numbers.The rationality and the high efficiency of the neural network is validated by comparing with the results of the direct numerical simulation (DNS),the large eddy simulation (LES),and the deep neural network (DNN) of other studies.To further enhance the prediction accuracy,three methods are developed by using several algorithms and simplified models in the neural network.In the method 1.the regularization is introduced and it is found that the oscillation and the overfitting of the results are eflectively prevented.In the method 2,y^+ is embedded in the input variable while the combination of the invariants is simplified in the method 3.From the predicted results,it can be seen that by using the first two methods,the errors are reduced.Moreover,the method 3 shows considerable advantages in the DNS trend and the smoothness of a curve.Consequently,it is concluded that the DNNs can predict effectively the anisotropic Reynolds stress and is a promising technique of the computational fluid dynamics. 展开更多
关键词 DEEP NEURAL network CHANNEL flow TURBULENCE model REYNOLDS stress
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Controversial protamine in dealing with acute cardiac tamponade during radiofrequency ablation 被引量:2
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作者 Dong-Dong Que Li-Yun Feng +2 位作者 Ya-Shu Yang xu-dong song Ping-Zhen Yang 《Chinese Medical Journal》 SCIE CAS CSCD 2021年第20期2503-2505,共3页
To the Editor:During radiofrequency catheter ablation(RFCA),acute cardiac tamponade is a common but life-threatening occurrence in which rapid blood accumulation in the pericardium cavity compresses the heart and caus... To the Editor:During radiofrequency catheter ablation(RFCA),acute cardiac tamponade is a common but life-threatening occurrence in which rapid blood accumulation in the pericardium cavity compresses the heart and causes the systemic circulation to deteriorate.Emergency percutaneous pericardiocentesis and immediate autologous blood transfusion are necessary.The administration of protamine for incessant bleeding is controversial,for pericardial blood clots may form spontaneously despite the neutralizing effects of heparin and may even necessitate thoracotomy.Our aim is to discuss the necessity and optimum time of protamine administration and to explore the means to prevent blood clot formation. 展开更多
关键词 ACUTE TRANSFUSION dealing
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Flexible Subclavian Artery Closure for an Inadvertent Injury to the Internal Mammary Artery During Internal Jugular Vein Catheterization 被引量:1
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作者 Dong-Dong Que Lei Liu +7 位作者 xu-dong song Xian-Bao Wang Xiu-Li Zhang Yi-Jun Zhou Li-Yun Feng Wen-Jie Yu Yuan-Qing Li Ping-Zhen Yang 《Chinese Medical Journal》 SCIE CAS CSCD 2016年第7期868-870,共3页
Central vein catheter (CVC) placement, which is widely utilized in clinical departments, is also highly important in preoperative preparations for radiofrequency catheter ablation (RFCA). The internal jugular vein... Central vein catheter (CVC) placement, which is widely utilized in clinical departments, is also highly important in preoperative preparations for radiofrequency catheter ablation (RFCA). The internal jugular vein or subclavian vein is the routine target. Arterial injury is not uncommon during the procedure but is potentially devastating in spite of the safety and advantages of the Seldinger technique. Compressing of the airway by a hematoma, as well as hemothorax, pseudoaneurysm, arteriovenous fistula, stroke, and even death, has been well-described. 展开更多
关键词 Internal Jugular Vein Catheterization Internal Mammary Artery Subclavian Artery Injury Vascular Closure Device
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Intramural Hematoma versus Thrombus: Radiation-induced Heart Disease Results in Mass Formation after Radiofrequency Ablation
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作者 Li-Yun Feng xu-dong song +8 位作者 Lei Liu Xian-Bao Wang Peng Liu Xiu-Li Zhang Yi-Jun Zhou Dong-Dong Que Wen-Jie Yu Yuan-Qing Li Ping-Zhen Yang 《Chinese Medical Journal》 SCIE CAS CSCD 2016年第22期2762-2764,共3页
Radiofrequency catheter ablation (RFCA),albeit an effective therapy for drug-refractory atrial fibrillation (AF),can be associated with complications in 3.9-22.0% of cases, of which cerebrovascular embolization,ca... Radiofrequency catheter ablation (RFCA),albeit an effective therapy for drug-refractory atrial fibrillation (AF),can be associated with complications in 3.9-22.0% of cases, of which cerebrovascular embolization,cardiac tamponade,and pulmonary vein stenosis are more common,and atrial hematoma is more rare.Here,we presented a case describing an elderly woman diagnosed with an intramural left atrial hematoma after AF ablation. 展开更多
关键词 Catheter Ablation Intramural Left Atrial Hematoma MASS Radiation-induced Heart Disease THROMBUS
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Successful Ablation of Moderator Band-Originated Ventricular Tachycardia at Its Ventricle Insertion Sites 被引量:1
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作者 Yuan-Qing Li Yu-Xi Wang +3 位作者 Dong-Dong Que Jing Shao xu-dong song Ping-Zhen Yang 《Chinese Medical Journal》 SCIE CAS CSCD 2018年第11期1371-1372,共2页
To the Editor: Moderator band (MB) is a part of the septomarginal trabeculation, which not only supports the anterior papillary muscle (APM) of the tricuspid valve but also connects it to the flee wall. Neverthel... To the Editor: Moderator band (MB) is a part of the septomarginal trabeculation, which not only supports the anterior papillary muscle (APM) of the tricuspid valve but also connects it to the flee wall. Nevertheless, with the advent of intracardiac echocardiography (ICE), electrophysiologists are now aware of the arrhythmogenic role of MB besides its mechanical function. MB-originated ventricular tachycardia or ventricular fibrillation (VT/VF) is a kind of idiopathic malignant arrhythmia in the absence of structural heart disease, which is frequently triggered by a premature ventricular contraction (PVC) from the same site. 展开更多
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