المؤلفون: Yan, Wen, Zhao, Tao

مصطلحات موضوعية: Electrical Engineering and Systems Science - Systems and Control

الوصف: Proportional control can be realized directly through the amplification of analog signals, and it also has the advantage of easy tuning parameters in digital signal control. However, it is difficult for the proportional control to preset the upper bound of settling time. To address this problem, a novel practical explicit-time control method is proposed. In bounded initial condition, this method makes this system error converge to a predefined neighborhood of zero within an explicit time. More specifically, the initial condition set and conditionally stable set are solved by practical explicit-time stabilization theorem. Based on that, a proportional feedback control is founded to achieve practical conditional fixed-time stability.

الوصول الحر: http://arxiv.org/abs/2406.05378Test

المؤلفون: Zhao, Tao, Wu, XiaoHou, Liu, JiaJi

المصدر: Clinics. October 2015 70(10)

مصطلحات موضوعية: Interleukin-22, Gene Polymorphism, Bladder Cancer, Case-Control Study

الوصف: OBJECTIVE:The cytokine interleukin-22 (IL-22), which is produced by T cells and natural killer cells, is associated with tumorigenesis and tumor progression in cancers. However, the role of IL-22 in bladder cancer has not been investigated.MATERIALS AND METHODS:A prospective hospital-based case-control study comprising 210 patients with pathologically proven bladder cancer and 210 age- and gender-matched healthy controls was conducted. The genotypes of 3 common polymorphisms (-429 C/T, +1046 T/A and +1995 A/C) of the IL-22 gene were determined with fluorogenic 5' exonuclease assays.RESULTS:Patients with bladder cancer had a significantly higher frequency of the IL-22 -429 TT genotype [odds ratio (OR)=2.04, 95% confidence interval (CI)=1.19, 3.49; p=0.009] and -429 T allele (OR=1.42, 95% CI=1.08, 1.87; p=0.01) than the healthy controls. These findings were still significant after a Bonferroni correction. When stratifying according to the stage of bladder cancer, we found that patients with superficial bladder cancer had a significantly lower frequency of the IL-22 -429 TT genotype (OR=0.48, 95% CI=0.23, 0.98; p=0.04). When stratifying according to the grade and histological type of bladder cancer, we found no statistical association. The IL-22 +1046 T/A and IL-22 +1995 A/C gene polymorphisms were not associated with the risk of bladder cancer.CONCLUSION:To the authors' knowledge, this is the first report documenting that the IL-22 -429 C/T gene polymorphism is associated with bladder cancer risk. Additional studies are required to confirm this finding.

وصف الملف: text/html

الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1807-59322015001000686Test

المؤلفون: Huang, Yufan, Li, Man, Zhao, Tao

مصطلحات موضوعية: Computer Science - Robotics

الوصف: The research on multi-robot coverage path planning (CPP) has been attracting more and more attention. In order to achieve efficient coverage, this paper proposes an improved DARP coverage algorithm. The improved DARP algorithm based on A* algorithm is used to assign tasks to robots and then combined with STC algorithm based on Up-First algorithm to achieve full coverage of the task area. Compared with the initial DARP algorithm, this algorithm has higher efficiency and higher coverage rate.

الوصول الحر: http://arxiv.org/abs/2304.09741Test

المؤلفون: Yang, Le, Han, Junwei, Zhao, Tao, Liu, Nian, Zhang, Dingwen

مصطلحات موضوعية: Computer Science - Computer Vision and Pattern Recognition

الوصف: Temporal action localization aims at localizing action instances from untrimmed videos. Existing works have designed various effective modules to precisely localize action instances based on appearance and motion features. However, by treating these two kinds of features with equal importance, previous works cannot take full advantage of each modality feature, making the learned model still sub-optimal. To tackle this issue, we make an early effort to study temporal action localization from the perspective of multi-modality feature learning, based on the observation that different actions exhibit specific preferences to appearance or motion modality. Specifically, we build a novel structured attention composition module. Unlike conventional attention, the proposed module would not infer frame attention and modality attention independently. Instead, by casting the relationship between the modality attention and the frame attention as an attention assignment process, the structured attention composition module learns to encode the frame-modality structure and uses it to regularize the inferred frame attention and modality attention, respectively, upon the optimal transport theory. The final frame-modality attention is obtained by the composition of the two individual attentions. The proposed structured attention composition module can be deployed as a plug-and-play module into existing action localization frameworks. Extensive experiments on two widely used benchmarks show that the proposed structured attention composition consistently improves four state-of-the-art temporal action localization methods and builds new state-of-the-art performance on THUMOS14. Code is availabel at https://github.com/VividLe/Structured-Attention-CompositionTest.
Comment: Accepted by T-IP

الوصول الحر: http://arxiv.org/abs/2205.09956Test

المؤلفون: Ding Xiaojun, Ma Qin, Zhao Tao, Liu Feng, Hu Xin

المصدر: Jixie chuandong, Vol 48, Pp 28-38 (2024)

مصطلحات موضوعية: Omni-directional mobile manipulating robots, Mobile platform, Manipulator, System manipulator, Transactional analysis, Mechanical engineering and machinery, TJ1-1570

الوصف: The omni-directional mobile manipulator robot (OMMR) is a class of a new robot with activating operating capability, which is composed of one or more manipulators mounted on a mobile platform. However, after the manipulator is installed on the mobile platform, the coupling effect between the manipulator and the mobile platform will significantly increase the complexity of the dynamic behavior of the whole system, involving the dynamic interaction between the ground and the mobile platform, the mobile platform and the manipulator, the manipulator and the operating environment, which brings great difficulties to the modeling of the system. Based on establishing the kinematics and statics models of OMMR, this study presents a simplified modeling approach of OMMR system dynamics. Based on this dynamic model, the vehicle-manipulator interaction model is established, and its interaction is analyzed. Simulation and experiments verify the correctness of the vehicle-manipulator interaction model, indirectly prove the rationality and effectiveness of the proposed OMMR system dynamics modeling approach, and provide model data for motion planning and control of robots.

وصف الملف: electronic resource

العلاقة: http://www.jxcd.net.cn/thesisDetails#10.16578/j.issn.1004.2539.2024.01.005Test; https://doaj.org/toc/1004-2539Test

الوصول الحر: https://doaj.org/article/2ad5aacf53904b78b50d37ea3d13754fTest

المؤلفون: Zhu Yuling, Wang Youqiang, Li Mengjie, Zhao Tao, He Yan

المصدر: Jixie chuandong, Vol 47, Pp 94-100 (2023)

مصطلحات موضوعية: Orthotropic anisotropic, Non-smooth brake disc, Thermodynamic coupling, Dissipation performance, Mechanical engineering and machinery, TJ1-1570

الوصف: A simplified three-dimensional brake model with crater structure is established by using the finite element software Abaqus, and the influence of the depth, diameters, degrees and types of craters on the temperature and stress of the brake disc is investigated by combining the thermal coupling theory and the orthogonal test method. On this basis, the temperature and stress fields of brake discs with different non-smooth surface forms are analyzed, and the influence of temperature with radius on non-smooth discs with different braking initial speeds and pressures during emergency braking is investigated under the optimal combination. The results show that the square pit brake disc with the pit depth of 5 mm, the diameter of 8 mm and the 20° interval between adjacent pits in the circumferential direction has the smallest temperature and stress by the orthogonal test method, which is the optimal combination. Among them, the square pit brake disc has the best heat dissipation performance. With the increase of the initial speed and pressure of braking, the temperature of this brake disc surface gradually increases, the highest temperatures of the brake disc all appeares in the brake disc radius of 136 mm.

وصف الملف: electronic resource

العلاقة: http://www.jxcd.net.cn/thesisDetails#10.16578/j.issn.1004.2539.2023.11.014Test; https://doaj.org/toc/1004-2539Test

الوصول الحر: https://doaj.org/article/8ebbf683cad140a18dd7181c332f0c7cTest

المؤلفون: Yang, Le, Han, Junwei, Zhao, Tao, Lin, Tianwei, Zhang, Dingwen, Chen, Jianxin

مصطلحات موضوعية: Computer Science - Computer Vision and Pattern Recognition

الوصف: Weakly supervised temporal action localization aims at learning the instance-level action pattern from the video-level labels, where a significant challenge is action-context confusion. To overcome this challenge, one recent work builds an action-click supervision framework. It requires similar annotation costs but can steadily improve the localization performance when compared to the conventional weakly supervised methods. In this paper, by revealing that the performance bottleneck of the existing approaches mainly comes from the background errors, we find that a stronger action localizer can be trained with labels on the background video frames rather than those on the action frames. To this end, we convert the action-click supervision to the background-click supervision and develop a novel method, called BackTAL. Specifically, BackTAL implements two-fold modeling on the background video frames, i.e. the position modeling and the feature modeling. In position modeling, we not only conduct supervised learning on the annotated video frames but also design a score separation module to enlarge the score differences between the potential action frames and backgrounds. In feature modeling, we propose an affinity module to measure frame-specific similarities among neighboring frames and dynamically attend to informative neighbors when calculating temporal convolution. Extensive experiments on three benchmarks are conducted, which demonstrate the high performance of the established BackTAL and the rationality of the proposed background-click supervision. Code is available at https://github.com/VividLe/BackTALTest.
Comment: To appear at TPAMI

الوصول الحر: http://arxiv.org/abs/2111.12449Test

المؤلفون: Zhao, Tao

مرشدي الرسالة: Fu, Xiaoming Prof. Dr.

مصطلحات موضوعية: 510, Socioeconomic Status, Social Community Question Answering, Mobile Phone Data, Social Media Content, Factor Graph, Hypergraph, Coupled Attribute Representation, Bidirectional Long Short-Term Memory, User-Generated Data, Social Status, Topical Opinion Leader, Informatik (PPN619939052)

الإتاحة: http://hdl.handle.net/21.11130/00-1735-0000-0003-C1B1-ATest

المؤلفون: Mao, Maoyi, Yang, Xiaowei, Liu, Chun, Zhao, Tao, Liu, Hui

المساهمون: National Natural Science Foundation of China, State Key Laboratory for GeoMechanics and Deep Underground Engineering

المصدر: Deep Underground Science and Engineering ; ISSN 2097-0668 2770-1328

الوصف: Shield tunnel, composed of several segments, is widely used in urban underground engineering. When the tunnel is under load, relative displacement occurs between adjacent segments. In the past, distributed optical fiber sensing technology was used to perform strain monitoring, but there is an urgent need to determine how to transform strain into displacement. In this study, optical frequency domain reflectometry was applied in laboratory tests. Aiming at the shear process and center settlement process of shield tunnel segments, two kinds of quantitative calculation methods were put forward to carry out a quantitative analysis. Meanwhile, the laboratory test process was simulated numerically utilizing the discrete element numerical analysis method. Optical fiber, an atypical geotechnical material, was innovatively applied for discrete element modeling and numerical simulation. The results show that the measured displacement of the dial gauge, the calculated results of the numerical model, and the displacement quantitatively calculated from the optical fiber data agree with each other in general. The latter two methods can potentially be utilized in engineering application of deformation monitoring at shield tunnel joints, but need to be further calibrated and adjusted in detail.

الإتاحة: https://doi.org/10.1002/dug2.12092Test

المؤلفون: Zhan, Jing, Wu, Xiaoyan, Fu, Xuelei, Li, Chenze, Deng, Ke-Qiong, Wei, Qin, Zhang, Chao, Zhao, Tao, Li, Congcong, Huang, Longting, Chen, Kewei, Wang, Qiongxin, Li, Zhengying, Lu, Zhibing

المساهمون: National Natural Science Foundation of China

المصدر: Scientific Reports ; volume 14, issue 1 ; ISSN 2045-2322

مصطلحات موضوعية: Multidisciplinary

الوصف: Continuous monitoring of cardiac motions has been expected to provide essential cardiac physiology information on cardiovascular functioning. A fiber-optic micro-vibration sensing system (FO-MVSS) makes it promising. This study aimed to explore the correlation between Ballistocardiography (BCG) waveforms, measured using an FO-MVSS, and myocardial valve activity during the systolic and diastolic phases of the cardiac cycle in participants with normal cardiac function and patients with congestive heart failure (CHF). A high-sensitivity FO-MVSS acquired continuous BCG recordings. The simultaneous recordings of BCG and electrocardiogram (ECG) signals were obtained from 101 participants to examine their correlation. BCG, ECG, and intracavitary pressure signals were collected from 6 patients undergoing cardiac catheter intervention to investigate BCG waveforms and cardiac cycle phases. Tissue Doppler imaging (TDI) measured cardiac time intervals in 51 participants correlated with BCG intervals. The BCG recordings were further validated in 61 CHF patients to assess cardiac parameters by BCG. For heart failure evaluation machine learning was used to analyze BCG-derived cardiac parameters. Significant correlations were observed between cardiac physiology parameters and BCG's parameters. Furthermore, a linear relationship was found betwen IJ amplitude and cardiac output (r = 0.923, R 2 = 0.926, p < 0.001). Machine learning techniques, including K-Nearest Neighbors (KNN), Decision Tree Classifier (DTC), Support Vector Machine (SVM), Logistic Regression (LR), Random Forest (RF), and XGBoost, respectively, demonstrated remarkable performance. They all achieved average accuracy and AUC values exceeding 95% in a five-fold cross-validation approach. We establish an electromagnetic-interference-free and non-contact method for continuous monitoring of the cardiac cycle and myocardial contractility and measure the different phases of the cardiac cycle. It presents a sensitive method for evaluating changes in both ...

الإتاحة: https://doi.org/10.1038/s41598-024-53464-8Test
https://www.nature.com/articles/s41598-024-53464-8.pdfTest
https://www.nature.com/articles/s41598-024-53464-8Test