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Chen F, Zhang Z, Wang LN, Yang X, Zhou CG, Zhu C, Wang L, Liu LM, Song YM. Transplantation of NEP1-40 and NT-3 Gene-Co-Transduced Neural Stem Cells Improves Function and Neurogenesis after Spinal Cord Injury in a Rat Model. Neurol India 2022; 70:S251-S258. [PMID: 36412377 DOI: 10.4103/0028-3886.360942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
BACKGROUND Spinal cord injury (SCI) generally results in necrosis, scarring, cavitation, and a release of inhibitory molecules of the nervous system, which lead to disruption of neurotransmission and impede nerve fiber regeneration. This study was intended to evaluate the therapeutic efficacy rates of the transplantation of NEP1-40- and NT-3 gene-co-transduced neural stem cells (NSCs) in a rat model of SCI. METHODS Ninety Sprague-Dawley rats were subdivided randomly into six groups: sham-operated, SCI model, SCI + NSCs-NC, SCI + NEP1-40-NSCs, SCI + NT-3-NSCs, and SCI + NEP1-40/NT-3-NSCs. Motor function at different time points was evaluated using the Basso, Beattie, and Bresnahan locomotor activity scoring system (BBB). At 8 weeks post-transplantation, histological analysis, a terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay, immunofluorescent assay, immunocytochemical staining, and cholera toxin subunit B (CTB) retrograde tracing were performed. RESULTS BBB scores of the co-transduction group significantly surpassed those of other transplantation groups and of the SCI-model group after 2 weeks post-transplantation. The apoptotic rate of neurocytes was significantly lower in the co-transduction group than in other experimental groups. Expression of NF-200, MBP, and ChAT was significantly higher in the SCI + NEP1-40/NT-3-NSCs group than in other transplantation groups, whereas the expression of GFAP and GAD67 was the second lowest after the sham-operated group. CTB retrograde tracing showed that CTB-positive neural fibers on the caudal side of the hemisected site were more numerous in the SCI + NEP1-40/NT-3-NSCs group than in other experimental groups. CONCLUSION Transplantation of NEP1-40- and NT-3-gene-co-transduced NSCs can modify the protein expression following acute SCI and promote neuron formation and axonal regeneration, thus having a neuroprotective effect. Furthermore, this effect surpasses that of transplantation of single-gene-transduced NSCs. Transplantation of NEP1-40- and NT-3-gene-co-transduced NSCs is effective at the neural recovery of the rat model of SCI and may be a novel strategy for clinical treatment of SCI.
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Affiliation(s)
- Feng Chen
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Zhuang Zhang
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Lin-Nan Wang
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Xi Yang
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Chun-Guang Zhou
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Ce Zhu
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Lei Wang
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Li-Min Liu
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
| | - Yue-Ming Song
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, No. 37, Guoxue Road, Chengdu, Sichuan 610041, People's Republic of China
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Wu HT, Pang QJ, Tang T, Liu JT, Zhou CG, Wang Y. [Symptomatic disc pseudocyst after percutaneous endoscopic discectomy of lumbar disc herniation:5 cases report and literature progress]. Zhongguo Gu Shang 2022; 35:669-674. [PMID: 35859379 DOI: 10.12200/j.issn.1003-0034.2022.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- Hai-Ting Wu
- Department of Spinal Surgery, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo No.2 Hospital, Ningbo 315099, Zhejiang, China
| | - Qing-Jiang Pang
- Department of Spinal Surgery, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo No.2 Hospital, Ningbo 315099, Zhejiang, China
| | - Tao Tang
- Department of Spinal Surgery, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo No.2 Hospital, Ningbo 315099, Zhejiang, China
| | - Jiang-Tao Liu
- Department of Spinal Surgery, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo No.2 Hospital, Ningbo 315099, Zhejiang, China
| | - Chun-Guang Zhou
- Department of Spinal Surgery, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo No.2 Hospital, Ningbo 315099, Zhejiang, China
| | - Yun Wang
- Department of Spinal Surgery, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo No.2 Hospital, Ningbo 315099, Zhejiang, China
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Zhu C, Yang HL, Im GH, Liu LM, Zhou CG, Song YM. Clinical algorithm for preventing missed diagnoses of occult cervical spine instability after acute trauma: A case report. World J Clin Cases 2021; 9:10369-10373. [PMID: 34904112 PMCID: PMC8638057 DOI: 10.12998/wjcc.v9.i33.10369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 07/29/2021] [Accepted: 09/10/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Missed or delayed diagnosis of cervical spine instability after acute trauma can have catastrophic consequences for the patient, resulting in severe neurological impairment. Currently, however, there is no consensus on the optimal strategy for diagnosing occult cervical spine instability. Thus, we present a case of occult cervical spine instability and provide a clinical algorithm to aid physicians in diagnosing occult instability of the cervical spine.
CASE SUMMARY A 57-year-old man presented with cervical spine pain and inability to stand following a serious fall from a height of 2 m. No obvious vertebral fracture or dislocation was found at the time on standard lateral X-ray, computed tomography, and magnetic resonance imaging (MRI). Subsequently, the initial surgical plan was unilateral open-door laminoplasty (C3-7) with alternative levels of centerpiece mini-plate fixation (C3, 5, and 7). However, the intraoperative C-arm fluoroscopic X-rays revealed significantly increased intervertebral space at C5-6, indicating instability at this level that was previously unrecognized on preoperative imaging. We finally performed lateral mass fixation and fusion at the C5-6 level. Looking back at the preoperative images, we found that the preoperative T2 MRI showed non-obvious high signal intensity at the C5-6 intervertebral disc and posterior interspinous ligament.
CONCLUSION MRI of cervical spine trauma patients should be carefully reviewed to detect disco-ligamentous injury, which will lead to further cervical spine instability. In patients with highly suspected cervical spine instability indicated on MRI, lateral X-ray under traction or after anesthesia and muscle relaxation needs to be performed to avoid missed diagnoses of occult cervical instability.
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Affiliation(s)
- Ce Zhu
- Department of Orthopedic Surgery and Orthopedics Research Institute, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Hui-Liang Yang
- Department of Orthopedic Surgery and Orthopedics Research Institute, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Gi Hye Im
- Department of Emergency Medicine, Rhode Island Hospital, Warren Alpert Medical School of Brown University, Providence, RI 02903, United States
| | - Li-Min Liu
- Department of Orthopedic Surgery and Orthopedics Research Institute, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Chun-Guang Zhou
- Department of Orthopedic Surgery and Orthopedics Research Institute, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Yue-Ming Song
- Department of Orthopedic Surgery and Orthopedics Research Institute, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
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Wang LN, Hu BW, Song YM, Liu LM, Zhou CG, Wang L, Yang X. Predictive ability of pharyngeal inlet angle for the occurrence of postoperative dysphagia after occipitocervical fusion. BMC Musculoskelet Disord 2021; 22:54. [PMID: 33422037 PMCID: PMC7797156 DOI: 10.1186/s12891-020-03921-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 12/26/2020] [Indexed: 02/08/2023] Open
Abstract
Background PIA has been proven to be a predictor for postoperative dysphagia in patients who undergo occipitospinal fusion. However, its predictive effect for postoperative dysphagia in patients who undergo OCF is unknown. The aim of this study was to evaluate the predictive ability of the pharyngeal inlet angle (PIA) for the occurrence of postoperative dysphagia in patients who undergo occipitocervical fusion (OCF). Methods Between 2010 and 2018, 98 patients who had undergone OCF were enrolled and reviewed. Patients were divided into two groups according to the presence of postoperative dysphagia. Radiographic parameters, including the atlas-dens interval (ADI), O-C2 angle (O-C2a), occipital and external acoustic meatus to axis angle (O-EAa), C2 tilting angle (C2Ta), C2-7 angle (C2-7a), PIA and narrowest oropharyngeal airway space (nPAS), were measured and compared. Simple linear regression and multiple regression analysis were used to evaluate the radiographic predictors for dysphagia. In addition, we used PIA = 90° as a threshold to analyze its effect on predicting dysphagia. Results Of the 98 patients, 26 exhibited postoperative dysphagia. Preoperatively, PIA in the dysphagia group was significantly higher than that in the nondysphagia group. We detected that O-C2a, O-EAa, PIA and nPAS all decreased sharply in the dysphagia group but increased slightly in the nondysphagia group. The changes were all significant. Through regression analyses, we found that PIA had a similar predictive effect as O-EAa for postoperative dysphagia and changes in nPAS. Additionally, patients with an increasing PIA exhibited no dysphagia, and the sensitivity of PIA <90° in predicting dysphagia reached 88.5%. Conclusions PIA could be used as a predictor for postoperative dysphagia in patients undergoing OCF. Adjusting a PIA level higher than the preoperative PIA level could avoid dysphagia. For those who inevitably had decreasing PIA, preserving intraoperative PIA over 90° would help avert postoperative dysphagia. Trial registration This trial has been registered in the Medical Ethics Committee of West China Hospital, Sichuan University. The registration number is 762 and the date of registration is Sep. 9 th, 2019.
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Affiliation(s)
- Lin-Nan Wang
- Department of Orthopedics Surgery and Orthopaedics Research Institute, West China Hospital, Sichuan University, No. 37 GuoXue Road, 610041, Chengdu, Sichuan, China
| | - Bo-Wen Hu
- Department of Orthopedics Surgery and Orthopaedics Research Institute, West China Hospital, Sichuan University, No. 37 GuoXue Road, 610041, Chengdu, Sichuan, China
| | - Yue-Ming Song
- Department of Orthopedics Surgery and Orthopaedics Research Institute, West China Hospital, Sichuan University, No. 37 GuoXue Road, 610041, Chengdu, Sichuan, China
| | - Li-Min Liu
- Department of Orthopedics Surgery and Orthopaedics Research Institute, West China Hospital, Sichuan University, No. 37 GuoXue Road, 610041, Chengdu, Sichuan, China
| | - Chun-Guang Zhou
- Department of Orthopedics Surgery and Orthopaedics Research Institute, West China Hospital, Sichuan University, No. 37 GuoXue Road, 610041, Chengdu, Sichuan, China
| | - Lei Wang
- Department of Orthopedics Surgery and Orthopaedics Research Institute, West China Hospital, Sichuan University, No. 37 GuoXue Road, 610041, Chengdu, Sichuan, China
| | - Xi Yang
- Department of Orthopedics Surgery and Orthopaedics Research Institute, West China Hospital, Sichuan University, No. 37 GuoXue Road, 610041, Chengdu, Sichuan, China.
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Wang LN, Hu BW, Song YM, Liu LM, Zhou CG, Wang L, Zhou ZJ, Xiu P, Chen TY, Yang X. Predictive abilities of O-C2a and O-EAa for the development of postoperative dysphagia in patients undergoing occipitocervical fusion. Spine J 2020; 20:745-753. [PMID: 31778822 DOI: 10.1016/j.spinee.2019.11.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/10/2019] [Accepted: 11/21/2019] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Dysphagia is a common postoperative complication in patients undergoing occipitocervical fusion (OCF). Previous studies had proposed the use of two measures-the occipital to C2 angle (O-C2a) and the occipital and external acoustic meatus to axis angle (O-EAa)-to predict postoperative dysphagia after OCF. However, these studies had small sample sizes and the predictive abilities of both measures are still not clear. PURPOSE To evaluate the predictive ability of O-EAa and O-C2a for dysphagia after OCF. STUDY DESIGN A retrospective clinical study. PATIENT SAMPLE A total of 109 consecutive patients who had undergone OCF. OUTCOME MEASURES Presence of postoperative dysphagia, O-C2a, C2 tilting angle (C2Ta), O-EAa, and the narrowest oropharyngeal airway space (nPAS). METHODS Between April 2010 and June 2018, 109 consecutive patients who had undergone OCF were reviewed. Patients were divided into two groups according to the presence of postoperative dysphagia. Radiographic measurements, including O-C2a, C2Ta, O-EAa, and nPAS, were evaluated at preoperative and 1 month postoperative and the findings were compared. Simple linear regression was used to measure the correlations between the parameters and the presence of dysphagia, and the correlations within the parameters. Multiple regression analysis was used to examine the variables that affected the change of nPAS (dnPAS%). Sensitivity and specificity analyses were used to evaluate the effectiveness of the previously proposed measures ("O-C2a change≤-5°" and "postoperative O-EAa<100°") for prediction of post-OCF dysphagia. RESULTS The incidence of dysphagia after OCF was 26.6% (29/109). Preoperative values for the radiographic parameters were similar between patients with and without dysphagia. In the dysphagia group, both O-C2a and O-EAa values showed a dramatic decrease after surgery, which was accompanied by a decrease in nPAS. Postoperative O-C2a, O-EAa, and nPAS in the dysphagia group were significantly smaller than those in the nondysphagia group (p<.05). The changes in O-EAa, O-C2a, and nPAS showed a linear correlation with the presence of dysphagia (p<.05). In addition, linear correlations were found between two of the three parameters. Multiple regression showed the change of O-C2a and O-EAa were significant predictors for dnPAS% (β=0.200, p=.022 and β=0.549, p=.000). The sensitivity and specificity of "O-C2a change≤-5°" in predicting dysphagia were 75.9% and 80.0% respectively, and those of "postoperative O-EAa<100°" were 75.9% and 62.5%, respectively. However, the sensitivity of the combination of these two values in predicting postoperative dysphagia was as high as 96.6%. CONCLUSION Both O-EAa and O-C2a could be critical predictors for postoperative dysphagia. During surgery, ensuring that the O-EAa exceeds 100° and simultaneously avoiding an O-C2a reduction greater than 5° could effectively avert postoperative dysphagia.
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Affiliation(s)
- Lin-Nan Wang
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China.
| | - Bo-Wen Hu
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Yue-Ming Song
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Li-Min Liu
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Chun-Guang Zhou
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Lei Wang
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Zhong-Jie Zhou
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Peng Xiu
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Tai-Yong Chen
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Xi Yang
- Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China.
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Wu HH, Tang T, Pang QJ, Yuan XH, Zhou CG. [Biomechanical study of the stability of subaxial cervical anterior transpedicular screw fixation for three-column injury]. Zhongguo Gu Shang 2018. [PMID: 29533041 DOI: 10.3969/j.issn.1003-0034.2018.01.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To compare the stability of subaxial cervical anterior transpedicular screw(ATPS) fixation and three traditional fixations for three-column injury. METHODS Six specimens of cervical spine were prepared. After measurememt of the range of motion(ROM) in intact state, the specimens were made into three-column injury models. The models were reconstructed with an anterior cervical cage, and stabilized by ATPS, anterior plate(AP), anterior plate + lateral mass screw(AP+LMS) and posterior transpedicular screw(PTPS). The ROM of the models in the four states were measured, and the results of data were compared after standardization. RESULTS The normalized ROM of ATPS state in flexion-extension, lateral bending, axial rotation were(77.17±4.75)%, (82.00±2.61)%, (83.17±2.23)%, which were significant small than those in intact state(P<0.05). The normalized ROM of AP state in flexion-extension, lateral bending, axial rotation were(119.67±7.42)%, (116.33±7.53)%, (112.67±5.99)% , which were significant larger than those in intact state(P<0.05). The normalized ROM of AP in all directions were significant larger than those of ATPS(P<0.05). There was no significant difference between normalized ROM of PTPS state and those of ATPS state in flexion-extension and lateral bending(P>0.05). The normalized ROM of PTPS state in axial rotation was(6.83±2.48)% and was significant larger than that of ATPS state(P=0.009). The normalized ROM of AP+LMS state in flexion-extension was(68.50±2.43)%, which was significant smaller than that of ATPS state(P=0.003). There was no significant difference between the normalized ROM of AP+LMS state and those of ATPS state in lateral bending and axial rotation(P>0.05). CONCLUSIONS Subaxial cervical three-column injury model reconstruction by ATPS can provide the adequate primary stability, of which biomechanics property is superior compared to AP and PTPS, and is similar to that of AP+LMS. It can be applied to the patients with no need to decompression and reduction through posterior approach.
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Affiliation(s)
- Hai-Hao Wu
- Department of Orthopaedics, Ningbo NO.2 Hospital, Ningbo 315010, Zhejiang, China
| | - Tao Tang
- Department of Orthopaedics, Ningbo NO.2 Hospital, Ningbo 315010, Zhejiang, China;
| | - Qing-Jiang Pang
- Department of Orthopaedics, Ningbo NO.2 Hospital, Ningbo 315010, Zhejiang, China
| | - Xin-Hua Yuan
- Department of Orthopaedics, Ningbo NO.2 Hospital, Ningbo 315010, Zhejiang, China
| | - Chun-Guang Zhou
- Department of Orthopaedics, Ningbo NO.2 Hospital, Ningbo 315010, Zhejiang, China
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Wang SJ, Yan WJ, Li X, Zhao G, Zhou CG, Fu X, Yang M, Tao J. Micro-Expression Recognition Using Color Spaces. IEEE Trans Image Process 2015; 24:6034-6047. [PMID: 26540689 DOI: 10.1109/tip.2015.2496314] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Micro-expressions are brief involuntary facial expressions that reveal genuine emotions and, thus, help detect lies. Because of their many promising applications, they have attracted the attention of researchers from various fields. Recent research reveals that two perceptual color spaces (CIELab and CIELuv) provide useful information for expression recognition. This paper is an extended version of our International Conference on Pattern Recognition paper, in which we propose a novel color space model, tensor independent color space (TICS), to help recognize micro-expressions. In this paper, we further show that CIELab and CIELuv are also helpful in recognizing micro-expressions, and we indicate why these three color spaces achieve better performance. A micro-expression color video clip is treated as a fourth-order tensor, i.e., a four-dimension array. The first two dimensions are the spatial information, the third is the temporal information, and the fourth is the color information. We transform the fourth dimension from RGB into TICS, in which the color components are as independent as possible. The combination of dynamic texture and independent color components achieves a higher accuracy than does that of RGB. In addition, we define a set of regions of interests (ROIs) based on the facial action coding system and calculated the dynamic texture histograms for each ROI. Experiments are conducted on two micro-expression databases, CASME and CASME 2, and the results show that the performances for TICS, CIELab, and CIELuv are better than those for RGB or gray.
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Wang SJ, Yan S, Yang J, Zhou CG, Fu X. A General Exponential Framework for Dimensionality Reduction. IEEE Trans Image Process 2014; 23:920-930. [PMID: 26270928 DOI: 10.1109/tip.2013.2297020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
As a general framework, Laplacian embedding, based on a pairwise similarity matrix, infers low dimensional representations from high dimensional data. However, it generally suffers from three issues: 1) algorithmic performance is sensitive to the size of neighbors; 2) the algorithm encounters the well known small sample size (SSS) problem; and 3) the algorithm de-emphasizes small distance pairs. To address these issues, here we propose exponential embedding using matrix exponential and provide a general framework for dimensionality reduction. In the framework, the matrix exponential can be roughly interpreted by the random walk over the feature similarity matrix, and thus is more robust. The positive definite property of matrix exponential deals with the SSS problem. The behavior of the decay function of exponential embedding is more significant in emphasizing small distance pairs. Under this framework, we apply matrix exponential to extend many popular Laplacian embedding algorithms, e.g., locality preserving projections, unsupervised discriminant projections, and marginal fisher analysis. Experiments conducted on the synthesized data, UCI, and the Georgia Tech face database show that the proposed new framework can well address the issues mentioned above.
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Abstract
Tensor subspace transformation, a commonly used subspace transformation technique, has gained more and more popularity over the past few years because many objects in the real world can be naturally represented as multidimensional arrays, i.e. tensors. For example, a RGB facial image can be represented as a three-dimensional array (or 3rd-order tensor). The first two dimensionalities (or modes) represent the facial spatial information and the third dimensionality (or mode) represents the color space information. Each mode of the tensor may express a different semantic meaning. Thus different transformation strategies should be applied to different modes of the tensor according to their semantic meanings to obtain the best performance. To the best of our knowledge, there are no existing tensor subspace transformation algorithm which implements different transformation strategies on different modes of a tensor accordingly. In this paper, we propose a fusion tensor subspace transformation framework, a novel idea where different transformation strategies are implemented on separate modes of a tensor. Under the framework, we propose the Fusion Tensor Color Space (FTCS) model for face recognition.
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Affiliation(s)
- Su-Jing Wang
- State Key Laboratory of Brain and Cognitive Science, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.
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Abstract
Magnetic carbon nanotube (mCNT) was formed via direct mixing of carbon nanotube (CNT) with magnetic nanoparticle (MNP) in dye solution. When the mass ratio of MNP to CNT was 4:1, all CNT were magnetically collected. The adsorption performance of mCNT was evaluated using methyl blue (MB) as a model adsorbate. Equilibrium of MB adsorption was attained in 60 min, and maximum adsorption occurred at pH 3-6. MB adsorption was independent of ionic strength and followed pseudo-second-order kinetics. According to the Langmuir isotherm, adsorption capacity of mCNT for MB was 115.34 mg g(-1). Thermodynamic analysis suggested MB adsorption onto mCNT was a spontaneous process. Reusability study results showed that 97.06, 96.26, 94.33, 92.91 and 90.14% of MB were removed in five consecutive cycles. The study suggests that the mCNT has a great potential application in dye removal from industrial wastewater.
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Affiliation(s)
- S Wang
- Department of Chemistry, China University of Geosciences, Wuhan, China
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Wang SJ, Yang J, Sun MF, Peng XJ, Sun MM, Zhou CG. Sparse tensor discriminant color space for face verification. IEEE Trans Neural Netw Learn Syst 2012; 23:876-888. [PMID: 24806760 DOI: 10.1109/tnnls.2012.2191620] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
As one of the fundamental features, color provides useful information and plays an important role for face recognition. Generally, the choice of a color space is different for different visual tasks. How can a color space be sought for the specific face recognition problem? To address this problem, we propose a sparse tensor discriminant color space (STDCS) model that represents a color image as a third-order tensor in this paper. The model cannot only keep the underlying spatial structure of color images but also enhance robustness and give intuitionistic or semantic interpretation. STDCS transforms the eigenvalue problem to a series of regression problems. Then one spare color space transformation matrix and two sparse discriminant projection matrices are obtained by applying lasso or elastic net on the regression problems. The experiments on three color face databases, AR, Georgia Tech, and Labeled Faces in the Wild face databases, show that both the performance and the robustness of the proposed method outperform those of the state-of-the-art TDCS model.
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Abstract
Recent research efforts reveal that color may provide useful information for face recognition. For different visual tasks, the choice of a color space is generally different. How can a color space be sought for the specific face recognition problem? To address this problem, this paper represents a color image as a third-order tensor and presents the tensor discriminant color space (TDCS) model. The model can keep the underlying spatial structure of color images. With the definition of n-mode between-class scatter matrices and within-class scatter matrices, TDCS constructs an iterative procedure to obtain one color space transformation matrix and two discriminant projection matrices by maximizing the ratio of these two scatter matrices. The experiments are conducted on two color face databases, AR and Georgia Tech face databases, and the results show that both the performance and the efficiency of the proposed method are better than those of the state-of-the-art color image discriminant model, which involve one color space transformation matrix and one discriminant projection matrix, specifically in a complicated face database with various pose variations.
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Affiliation(s)
- Su-Jing Wang
- College of Computer Science and Technology, Jilin University, Changchun 130012, China.
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Yao ZW, Jiang GB, Zhou CG, Li H, Xu HZ. Distribution of polychlorinated biphenyls in the Bering and Chukchi Sea. Bull Environ Contam Toxicol 2001; 66:508-513. [PMID: 11443315 DOI: 10.1007/s001280036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2000] [Accepted: 12/20/2000] [Indexed: 05/23/2023]
Affiliation(s)
- Z W Yao
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Post Office Box 2871, Beijing, 100085, People's Republic of China
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Zhou CG. [Effects of oxygen radical scavengers on the output of 3-methylhistidine in urine after severe burns]. Zhonghua Zheng Xing Shao Shang Wai Ke Za Zhi 1991; 7:54-5, 78. [PMID: 2032183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Burned rats (30% TBSA III) were divided into two groups at random: animals of group A receiving I. M. injection of bovine serum albumin served as control; group B, the treated group, received I.M. injection of superoxide dismutase (SOD) and catalase (CAT). The urine of these animals collected respectively on PBD 5,7,9,11, was analysed according to the improved program on the 121-MB Amino Acid Analyzer (Beckman) after acidolysis. It was found that on PBD 5,7,9,11 urinary 3-Mehis excretion was significantly lower in group B than that in group A (P less than 0.01). It suggested that probably a certain relationship existed between lipoperoxide and increased protein catabolism after severe burns. SOD and CAT, the oxygen radical scavengers could reduce protein catabolism to a certain extent.
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Affiliation(s)
- C G Zhou
- Central Lab, Third Military Medical College
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18
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Wu G, Gao LD, Zhou CG, Liu MJ. [Surgical treatment of epilepsy with ECoG monitoring]. Hua Xi Yi Ke Da Xue Xue Bao 1987; 18:275-8. [PMID: 3119458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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