8 results on '"Liu, Wengao"'
Search Results
2. The influence of uneven frost heave and thermal conditions on the deformation and damage of slab track in seasonally frozen regions
- Author
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Zhang, Kaiyao, Ren, Juanjuan, Ye, Wenlong, Li, Chen, Xu, Guihong, Liu, Wengao, and Deng, Shijie
- Published
- 2024
- Full Text
- View/download PDF
3. Adhesion performance tests and analysis of interface damage for CRTS III prefabricated slab tracks
- Author
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Du, Wei, Ren, Juanjuan, Liu, Wengao, Zhang, Kaiyao, Deng, Shijie, and Zhao, Pingrui
- Published
- 2023
- Full Text
- View/download PDF
4. Intelligent Detection of Surface Defects in High-Speed Railway Ballastless Track Based on Self-Attention and Transfer Learning.
- Author
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Ye, Wenlong, Ren, Juanjuan, Li, Chen, Liu, Wengao, Zhang, Zeyong, and Lu, Chunfang
- Subjects
SURFACE defects ,TRANSFORMER models ,CONVOLUTIONAL neural networks ,DEEP learning ,INTELLIGENT tutoring systems ,HIGH speed trains - Abstract
The detection of ballastless track surface (BTS) defects is a prerequisite for ensuring the safe operation of high-speed railways. Traditional convolutional neural networks fail to fully exploit contextual information and lack global pixel representations. The extensive stacking of convolutions leads deep learning models to play a black-box detection role, lacking interpretability. Due to the current lack of sufficient high-quality surface data for ballastless tracks, it is a severe constraint on the accurate identification of the substructure state in high-speed railways. This paper proposes an intelligent detection method for BTS defects named TrackNet based on self-attention and transfer learning. The method enhances the fusion ability of global features of BTS defects using multihead self-attention. The model's dependence on extensive defect data is reduced by transferring knowledge from large-scale publicly available datasets. Experimental results demonstrate that compared to advanced Swin Transformer model results, the TrackNet model achieves improvements in average accuracy and F1-score by 5.15% and 5.16%, respectively, on limited test data. The TrackNet model visualizes the decision regions of the model in identifying BTS defects, revealing the black-box recognition mechanism of deep learning models. This research performs engineering applications and provides valuable insights for the multiclass recognition of BTS defects in high-speed railways. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
5. Right versus left transthoracic approach for lymph node-negative esophageal squamous cell carcinoma.
- Author
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Qilong Ma, Wengao Liu, Hao Long, Tiehua Rong, Lanjun Zhang, Yongbin Lin, Guowei Ma, Ma, Qilong, Liu, Wengao, Long, Hao, Rong, Tiehua, Zhang, Lanjun, Lin, Yongbin, and Ma, Guowei
- Subjects
DIGESTIVE organ surgery ,ESOPHAGEAL tumors ,SURGICAL excision ,LONGITUDINAL method ,LYMPH nodes ,LYMPH node surgery ,SQUAMOUS cell carcinoma ,SURVIVAL ,TUMOR classification ,RETROSPECTIVE studies ,KAPLAN-Meier estimator - Abstract
Background: To compare the right and left transthoracic approach on the post-operative survival of patients with lymph node-negative esophageal squamous cell carcinoma.Methods: Six hundred and ninety-five ESCC patients who underwent esophagectomy between 1990 and 2005 were retrospectively enrolled in the present study and were confirmed by histology to be of no lymph node metastasis. Those who had received neoadjuvant chemotherapy or radiotherapy were excluded from the study. Patients were divided into two groups, the left (n=545) and right (n=150) transthoracic groups. The follow-up duration ranged from 1 to 20 years with a mean of 7 years. Kaplan-Meier and univariate and multivariate Cox proportional hazards were used for analysis.Results: 3- and 5-year CSS rates were 62.0 % and 44.0 % in the left group, while the corresponding figures in the right group were 56.0 % and 40.0 %(P<0.05). The overall survival for the two groups was significantly different (P=0.045). Survival analyses were stratified by stages, which found that the favorable survival advantage was not present. When the survival curves were stratified by tumor locations, a significant difference was not revealed. Surgical approaches were regarded as one of the prognostic factors in the univariate analysis (P=0.019). However, this significance could not be confirmed in multivariate Cox regression analysis (P=0.193).Conclusions: The left transthoracic approach is superior in some aspects to the right transthoracic approach regarding surgical and oncological outcomes in the treatment of lymph node negative ESCC. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
6. Alcohol and survival in ESCC: prediagnosis alcohol consumption and postoperative survival in lymph node-negative esophageal carcinoma patients.
- Author
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Ma Q, Liu W, Jia R, Long H, Zhang L, Lin P, Zhao H, and Ma G
- Subjects
- Adult, Aged, Alcoholism complications, Carcinoma, Squamous Cell complications, China, Cohort Studies, Esophageal Neoplasms complications, Esophageal Squamous Cell Carcinoma, Esophagectomy, Female, Humans, Kaplan-Meier Estimate, Lymph Nodes pathology, Lymphatic Metastasis, Male, Middle Aged, Neoplasm Staging, Postoperative Period, Proportional Hazards Models, Retrospective Studies, Risk, Treatment Outcome, Alcohol Drinking, Carcinoma, Squamous Cell mortality, Esophageal Neoplasms mortality
- Abstract
Background: The association between esophageal cancer and prediagnosis alcohol consumption is well established. However, evidence that prediagnosis alcohol consumption affects postoperative survival in patients with lymph node-negative esophageal squamous cell carcinoma (ESCC) is lacking. We conducted a retrospective study on the effect of prediagnosis alcohol consumption on the postoperative survival of patients with lymph node-negative ESCC in China., Methods: We enrolled 643 ESCC patients with negative lymphatic metastasis who had undergone esophagectomy between 1990 and 2005 at the Department of Thoracic Surgery, Sun Yat-sen University Cancer Center, Guangzhou, China, and reviewed their demographic, pathologic, preoperative, and cancer outcome data obtained from medical records. These data were analyzed using life table and Kaplan-Meier analyses and multivariate Cox regression., Results: There was a significant reduction in 3- and 5-year survival in drinkers with lymph node-negative ESCC. For drinkers, 3- and 5-year survival rates were 43% and 36% respectively, whereas, for nondrinkers, the corresponding values were 63% and 58%, respectively (p < 0.05). Multivariate Cox regression showed that drinking (p = 0.001, relative risk =1.583) was an independent factor for survival in patients with lymph node-negative ESCC. Striated analysis revealed that drinking was an independent factor for survival in patients with stage II A (p = 0.008, relative risk =1.679), stage IB (p = 0.044, relative risk=1.517), and well (p=0.011, relative risk =1.783) and moderately (p = 0.002, relative risk = 1.915) differentiated ESCC., Conclusions: Prediagnosis alcohol consumption is an independent prognostic factor for postoperative survival in patients with lymph node-negative ESCC., Competing Interests: There is no conflict of interest.
- Published
- 2016
- Full Text
- View/download PDF
7. Inflammation-based prognostic system predicts postoperative survival of esophageal carcinoma patients with normal preoperative serum carcinoembryonic antigen and squamous cell carcinoma antigen levels.
- Author
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Ma Q, Liu W, Jia R, Jiang F, Duan H, Lin P, Zhang L, Long H, Zhao H, and Ma G
- Subjects
- Adult, Aged, Aged, 80 and over, Biomarkers, Tumor blood, C-Reactive Protein analysis, Carcinoma, Squamous Cell surgery, Esophageal Neoplasms surgery, Female, Follow-Up Studies, Humans, Inflammation pathology, Male, Middle Aged, Neoplasm Staging, Postoperative Period, Prognosis, Retrospective Studies, Severity of Illness Index, Survival Rate, Antigens, Neoplasm blood, Carcinoembryonic Antigen blood, Carcinoma, Squamous Cell blood, Carcinoma, Squamous Cell mortality, Esophageal Neoplasms blood, Esophageal Neoplasms mortality, Esophagectomy mortality, Inflammation blood, Serpins blood
- Abstract
Background: The Glasgow Prognostic Score (GPS) is an established inflammation-based system that is used to predict the prognosis for several types of malignancies. In this retrospective study, we assessed the postoperative survival of 725 patients with non-metastatic esophageal squamous cell carcinoma who had normal preoperative serum tumor marker levels according to the GPS., Methods: Among 1394 patients who underwent esophagectomy between August 2006 and December 2010, 725 with normal preoperative serum levels of carcinoembryonic antigen (CEA) and squamous cell carcinoma antigen (SCC-Ag) were enrolled. All demographic, pathologic, and survival data were analyzed retrospectively. Uni- and multivariate analyses were performed to evaluate the relationship with overall survival. The Kaplan-Meier analysis and log-rank tests were used to compare the survival curves between patients with GPS 0 (group A) and 1 or 2 (group B)., Results: Patients in group A exhibited significantly better 3- and 5-year cancer-specific survival (CSS) rates (0.780 and 0.759, respectively) than those in group B (0.624 and 0.605, respectively). Multivariate Cox regression analysis revealed that age, tumor length, pathological tumor-node-metastasis (pTNM) stage, venous invasion, lymph node metastasis, serum albumin and C-reactive protein levels, and GPS were associated with postoperative survival of these patients. Further multivariate analysis confirmed that GPS was an independent prognostic factor. The Kaplan-Meier analysis and log-rank tests demonstrated a significant difference in CSS between groups A and B (P = 0.001)., Conclusions: GPS may be a valuable prognostic indicator for esophageal cancer patients with normal preoperative CEA and SCC-Ag serum levels.
- Published
- 2016
- Full Text
- View/download PDF
8. Right versus left transthoracic approach for lymph node-negative esophageal squamous cell carcinoma.
- Author
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Ma Q, Liu W, Long H, Rong T, Zhang L, Lin Y, and Ma G
- Subjects
- Adult, Aged, Carcinoma, Squamous Cell mortality, Carcinoma, Squamous Cell pathology, Esophageal Neoplasms mortality, Esophageal Neoplasms pathology, Esophageal Squamous Cell Carcinoma, Female, Follow-Up Studies, Humans, Kaplan-Meier Estimate, Lymph Node Excision methods, Lymph Nodes pathology, Male, Middle Aged, Neoplasm Staging, Retrospective Studies, Survival Rate, Carcinoma, Squamous Cell surgery, Esophageal Neoplasms surgery, Esophagectomy methods
- Abstract
Background: To compare the right and left transthoracic approach on the post-operative survival of patients with lymph node-negative esophageal squamous cell carcinoma., Methods: Six hundred and ninety-five ESCC patients who underwent esophagectomy between 1990 and 2005 were retrospectively enrolled in the present study and were confirmed by histology to be of no lymph node metastasis. Those who had received neoadjuvant chemotherapy or radiotherapy were excluded from the study. Patients were divided into two groups, the left (n=545) and right (n=150) transthoracic groups. The follow-up duration ranged from 1 to 20 years with a mean of 7 years. Kaplan-Meier and univariate and multivariate Cox proportional hazards were used for analysis., Results: 3- and 5-year CSS rates were 62.0 % and 44.0 % in the left group, while the corresponding figures in the right group were 56.0 % and 40.0 %(P<0.05). The overall survival for the two groups was significantly different (P=0.045). Survival analyses were stratified by stages, which found that the favorable survival advantage was not present. When the survival curves were stratified by tumor locations, a significant difference was not revealed. Surgical approaches were regarded as one of the prognostic factors in the univariate analysis (P=0.019). However, this significance could not be confirmed in multivariate Cox regression analysis (P=0.193)., Conclusions: The left transthoracic approach is superior in some aspects to the right transthoracic approach regarding surgical and oncological outcomes in the treatment of lymph node negative ESCC.
- Published
- 2015
- Full Text
- View/download PDF
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