Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-04-17 Cooperative journals: 《计算机应用研究》
Abstract： Due to the envelope fitting problem exists in the process of empirical mode decomposition, this paper proposed an improved algorithm which could eliminate the undershoot phenomenon exactly. By introducing "pseudo-extreme points", this algorithm increased the number of extreme points and formed new extreme value sequence. Then it got new envelope by using the new extreme value sequence interpolation. The envelope fitted by this method was closer to the original signal and has better smoothness. Finally, A contrast result between cubic spline interpolation and this algorithm showed that the number of undershoots decreased by about 77.5%, which proved that this algorithm could effectively reduce the number of undershoot points. In addition, fitting the envelope could tightly wrap the original signal and have a better envelope.
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2018-01-25 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To investigate the risk factors of the serious complications related with double-J ureteral stent placement following percutaneous nephrolithotomy (PCNL). Methods Clinical data were reviewed for 272 patients treated with PCNL and indwelling double-J stents between January, 2014 andApril, 2016. The risk factors of serious complications were identified using univariate and multivariate logistic regression analysis. Results Serious complications of double-J ureteral stenting occurred in 63 patients (23.1%). Univariate and multivariate logistic regression analysis indicated that the ureter abnormalities (β=1.735, P=0.000, OR=5.670), stent indwelling duration (β=1.206, P=0.028, OR=3.340), gender (β=0.895, P=0.016, OR=2.446), preoperative urinary tract infection (β=0.849, P=0.020 , OR=2.338) and stent size (β=0.847, P=0.011, OR=2.333) were all risk factors of serious complications related with the procedure. Conclusion Male patients are exposed to a higher risk of serious complications following PCNL. Effective management of urinary tract infection and choice of appropriate stent size in cases of ureteral abnormalities help to reduce these complications. The double-J stent should be withdrawn as soon as possible in patientswithgoodpostoperativerecovery.
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