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| 1 | Feature Extraction Method Based on Pseudo-Wigner-Ville Distribution for Rotational Machinery in Variable Operating Conditions显示文摘In the case of fault diagnosis for roller bearings, the conventional diagnosis approaches by using the time interval of energy impacts in time-frequency distribution or the pass-frequencies are based on the assumption that machinery operates under a constant rotational speed. However, when the rotational speed varies in the broader range, the pass-frequencies vary with the change of rotational speed and bearing faults cannot be identified by the interval of impacts. Researches related to automatic diagnosis for rotational machinery in variable operating conditions were quite few. A novel automatic feature extraction method is proposed based on a pseudo-Wigner-Ville distribution (PWVD) and an extraction of symptom parameter (SP). An extraction method for instantaneous feature spectrum is presented using the relative crossing information (RCI) and sequential inference approach, by which the feature spectrum from time-frequency distribution can be automatically, sequentially extracted. The SPs are considered in the frequency domain using the extracted feature spectrum to identify among the conditions of a machine. A method to obtain the synthetic symptom parameter is also proposed by the least squares mapping (LSM) technique for increasing the diagnosis sensitivity of SP. Practical examples of diagnosis for bearings are given in order to verify the effectiveness of the proposed method. The verification results show that the features of bearing faults, such as the outer-race, inner-race and roller element defects have been effectively extracted, and the proposed method can be used for condition diagnosis of a machine under the variable rotational speed. | WANG Huaqing LIKe SUN Hao CHEN Peng | 2011 | Chinese Journal of Mechanical Engineering2011，24，4： | 8 |
| 2 | High level of serum AMBP is associated with poor response to paclitaxel–capecitabine chemotherapy in advanced gastric cancer patients显示文摘 | Hao Huang Yong Han Jing Gao Junnan Feng Lei Zhu Like Qu Lin Shen Chengchao Shou | 2013 | Medical Oncology2013，，4： | 3 |
| 3 | Effects of treadmill exer- cise training on liver fat accumulation and estrogen receptor alpha ex- pression in intact and ovariectomized rats with or without estrogen 显示文摘 | Like Hao Yijing Wang Yushuang Duan | 2010 | Eur J Appl Physiol2010，109，5： | 1 |
| 4 | Does precut technique improve selective bile duct cannulation or increase post-ERCP pancreatitis rate? A meta-analysis of randomized controlled trials显示文摘 | Biao Gong Lixiao Hao Like Bie Bo Sun Mei Wang | 2010 | Surgical Endoscopy2010，，11： | 1 |
| 5 | Does precut technique improve selective bile duct cannulation or increase post-ERCP pancreatitis rate? A meta-analysis of randomized controlled trials显示文摘 | Biao Gong Lixiao Hao Like Bie Bo Sun Mei Wang | 2010 | Surgical Endoscopy2010，，11： | 1 |
| 6 | Usefulness of an algorithm for endoscopic retrieval of proximally migrated 5Fr and 7Fr pancreatic stents显示文摘BACKGROUND:Proximal migration of pancreatic stent (PMPS)is an infrequent event but its management can be technically challenging and there are no standard retrieval methods.This study aimed to determine the results of an endoscopic stent retrieval algorithm in terms of feasibility and efficacy of the endoscopic procedure. METHODS:During the period from January 2008 to December 2009,15 patients(8 women and 7 men with a mean age of 51.9 years)with PMPS were included in this study.Stent retrieval was approached initially with balloon extraction followed by rat-tooth forceps and basket.A rescue approach such as using a stent retriever was attempted when other approaches failed. RESULTS:All the PMPSs(six 5Fr,nine 7Fr)were retrieved successfully within one ERCP session.Balloon extraction was successful in 9(60%)patients.In the 6 failed cases of balloon extraction,wire-guided rat-tooth forceps grasp was successful in 4,and stone extraction basket grasp was successful in 1 in whom forceps grasp failed.One stent was finally rescued with a stent retriever when balloon extraction,forceps and basket grasp all failed.In patients with successful balloon extraction,44.4% (4/9)developed post-ERCP hyperamylasemia but none of them developed post-procedure pancreatitis. CONCLUSIONS:With this algorithm,5Fr and 7Fr PMPS were successfully retrieved in all of the patients.Most PMPSs can be safely retrieved with the commonly-used approaches in this study.Those less used approaches can be used as a rescue method. | Biao Gong,Bo Sun,Li-Xiao Hao and Like Bie Department of Gastroenterology,Ruijin Hospital, Shanghai Jiaotong University School of Medicine,Shanghai 200025,China Department of Gastroenterology,Shanghai Gleneagles Medical Center,Parkway Health,Shanghai 200003,China Department of Hepatobiliary Surgery,No.455 Hospital,Shanghai 200025, China | 2011 | Hepatobiliary & Pancreatic Diseases International2011，10，2： | 1 |
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