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Fault Classification for On-board Equipment of High-speed Railway Based on Attention Capsule Network

International Journal of Automation and computing 2021年第5期18卷 814-825页

作者： Lu-Jie Zhou Jian-Wu dang Zhen-hai Zhang School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Gansu Provincial Engineering Research Center for Artificial Intelligence and Graphic&Image Processing Lanzhou 730070China

The conventional troubleshooting methods for high-speed railway on-board equipment, with over-reliance on personnel experience, is characterized by one-sidedness and low efficiency. In the process of high-speed train operation, numerous text-based onboard logs are recorded by on-board computers. Machine learning methods can help technicians make a correct judgment of fault types using the on-board log reasonably. Therefore, a fault classification model of on-board equipment based on attention capsule networks is proposed. This paper presents an empirical exploration of the application of a capsule network with dynamic routing in fault classification. A capsule network can encode the internal spatial part-whole relationship between various entities to identify the fault types. As the importance of each word in the on-board log and the dependencies between them have a significant impact on fault classification, an attention mechanism is incorporated into the capsule network to distill important information. Considering the imbalanced distribution of normal data and fault data in the on-board log, the focal loss function is introduced into the model to adjust the imbalanced data. The experiments are conducted on the on-board log of a railway bureau and compared with other baseline models. The experimental results demonstrate that our model outperforms the compared baseline methods, proving the superiority and competitiveness of our model.

关键词： On-board equipment fault classification capsule network attention mechanism focal loss

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Ranging-aided relative navigation of multi-platforms

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Control Theory and Technology 2018年第2期16卷 122-132页

作者： hai-Long PEI Ruican xia Key Lab of Autonomous Systems and Networked Control Ministry of Education China Unmanned System Engineering Center of Guangdong Province Guangzhou Guangdong 510640 China School of Automation South China University of Technology Guangzhou Guangdong 510640 China

This paper proposes a relative attitude and distance estimation algorithm based on pairwise range measurements between vehicles as well as inertial measurement of each platform. The solution of Wahba＇s Problem is introduced to compute the relative attitude between multi-platforms with the sampled pairwise ranges, in which the relative distance estimation is derived and the estimation error distributions are analyzed. An extended Kalman filter is designed to fuse the estimated attitude and distance with the inertial measurement of each platform. The relative poses between platforms are determined without any external aided measurement. To show this novelty, a real testbed is constructed by our research lab. And the experiment results are positive.

关键词： Multi-vehicles relative navigation Wahba's Problem pose estimation extended Kalman filter

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Tumor heterogeneity and the potential role of liquid biopsy in bladder cancer

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Cancer Communications 2021年第2期41卷 91-108页

作者： hai-Ming Huang hai-xia Li Department of Clinical Laboratory Peking University First HospitalBeijing 100034P.R.China

Bladder cancer(BC)is a heterogeneous disease that characterized by genomic instability and a high mutation *** in tumor may partially explain the diversity of responses to targeted therapies and the various clinical outcomes.A combination of cytology and cystoscopy is the standard methodology for BC diagnosis,prognosis,and disease ***,genomics analyses of single tumor-biopsy specimens may underestimate the mutational burden of heterogeneous *** biopsy,as a promising technology,enables analysis of tumor components in the bodily fluids,such as blood and urine,at multiple time points and provides a minimally invasive approach that can track the evolutionary dynamics and monitor tumor *** this review,we describe the multiple faces of BC heterogeneity at the genomic and transcriptional levels and how they affect clinical care and *** also summarize the outcomes of liquid biopsy in BC,which plays a potential role in revealing tumor ***,we discuss the challenges that must be addressed before liquid biopsy can be widely used in clinical treatment.

关键词： bladder cancer genomic heterogeneity transcriptome heterogeneity liquid biopsy circulating tumor DNA

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A Method of Determining Selectivity Coefficients Based on the Practical Slope of Ion Selective Electrodes

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Chinese Chemical Letters 2002年第4期13卷 355-358页

作者： hai xia WANG Min PU School of Science Xi’an Jiaotong UniversityXi’an 710049

It is a problem to be solved that the experimental selectivity coefficients of ion selective electrodes (ISEs) depend on the activity. This paper studied the new method of determining selectivity coefficients. A mixed ion response equation, which was similar to Nicolsky-Eisenman (N-E) equation recommended by IUPAC, was proposed. The equation includes the practical response slope of ISEs to the primary ion and the interfering ion. The selectivity coefficient was defined by the equation instead of the N-E equation. The experimental part of the method is similar to that based on the N-E equation. The values of selectivity coefficients obtained with this method do not depend on the activity whether the electrodes exhibit the Nernst response or non-Nernst response. The feasibility of the new method is illustrated experimentally.

关键词： Ion selective electrodes potentiometric selectivity coefficients Nicolsky-Eisenman equation.

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Mechanisms of regulation and function of G-protein-coupled receptor kinases

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World Journal of Gastroenterology 2006年第48期12卷 7753-7757页

作者： Wen Yang Shi-hai xia Department of Gastroenterology Pancreas Center Affiliated Hospital of Medical College of theChinese People's Armed Police Forces Tianjin 300162 China

G-protein-coupled receptor kinases (GRKs) interact with the agonist-activated form of G-protein-coupled receptor (GPCR) to affect receptor phosphorylation and to initiate profound impairment of receptor signaling, or desensitization. GPCR forms the largest family of cell surface receptors, and defects in GRK function have the potential consequence to affect GPCR-stimulated biological responses in many pathological situations.

关键词： G-protein-coupled receptor kinases G-protein-coupled receptor Signal Transduction Phosphorylation

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Weak (1,1) Boundedness of Oscillatory Singular Integral with Variable Phase

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Acta Mathematica Sinica,English Series 2019年第11期35卷 1741-1759页

作者： hai xia YU Jun Feng LI Department of Mathematics Sun Yat-sen UniversityGuangzhou 510275P.R.China School of Mathematical Sciences Dalian University of TechnologyDalian 116024P.R.China

In this paper,the weak(1,1)boundedness of oscillatory singular integral with variable phase P(x)γ(y)for any x,y∈R,Tf(x):=p.v.∫∞-∞eiP(x)γ(y)f(x?y)dy/y is studied,where P is a real monic polynomial on R.

关键词： Weak (1,1) boundedness oscillatory singular integral variable curve

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OPTIMAL STARTING PRICE FOR EBAY-LIKE ONLINE AUCTIONS

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Journal of Systems Science & Complexity 2006年第1期19卷 9-21页

作者： hai YU Shouyang WANG Chuangyin dang Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100080 China Department of Manufacturing Engineering and Engineering Management City University of Hong Kong HongKong China

Reserve price auctions are one of hot research issues in traditional auction theory. Here we study the starting price in an online auction, the counterpart of the public reserve price in a traditional auction. By considering three features of eBay-like online auctions： stochastic entry of bidders （subject to Poisson process）, insertion fee proportional to the starting price, and time discount, we have analyzed the properties of extremum points of the starting price for maximizing the seller＇s expected revenue, and found that, under certain conditions, the optimal starting price should be at the lowest Mlowable level, which is contrary to the results from the classic auction theory and finds its optimality in reality. We have also developed a general extended model of multistage auctions and carried out analysis on its properties. At last, some directions for further research are also put forward.

关键词： Online auctions reserve price starting price stochastic entry.

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Ag/AgX nanostructures serving as antibacterial agents:achievements and challenges

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Rare Metals 2022年第2期41卷 519-539页

作者： Pei-Pei Li hai-xia Wu Alideertu Dong College of Chemistry and Chemical Engineering Engineering Research Center of Dairy Quality and Safety Control TechnologyMinistry of EducationInner Mongolia UniversityHohhot 010021China

Bacterial infections,especially the frequently emerging "superbugs",seriously affect the quality of human life and even threaten human *** the emerging antimicrobial agents that effectively eradicate pathogens,nanomaterials have been widely explored due to their effectiveness against wide-spectrum bacteria and“superbugs”.Of them,Ag/AgX nanostructures(X representing Cl,Br or I)have emerged as an excellent antibacterial agent because of their excellent photocatalytic performance in inactivating pathogens under light irradiation,which provides a new opportunity for the development of high-efficient visible-light driven photocatalytic *** date,Ag/AgX nanostructures have been widely employed in antibacterial associated fields because they are efficient in producing reactive oxygen species(ROS)and reactive chlorine species(RCS)under visible light *** this review,we summarized the recent progress of Ag/AgX nanostructures as plasmonic photocatalysts in the antibacterial field,focusing on the antibacterial effects and mechanisms of Ag/AgX nanostructures,as well as their potent ***,the challenges and prospects of Ag/AgX nanostructures acting as active antibacterial agents were discussed.

关键词： Ag/AgX Photocatalytic Antibacterial Nanostructure Nanoengineering

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Area Spectra of Schwarzschild-Anti de Sitter Black Holes from Highly Real Quasinormal Modes

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Chinese Physics Letters 2011年第10期28卷 9-12页

作者： GUO Guang-hai DING xia School of Mathematics and Physics Qingdao University of Science and TechnologyQingdao 266061

Motivated by the new physical interpretation of quasinormal modes proposed by Maggiore [Phys. Rev. Lett. 100 (2008) 141301], we investigate the quantization of large Schwarzschild-Anti de Sitter black holes in even-dimensional spacetimes, from the interesting highly real quasinormal modes found recently. Following Maggiore's treatment and Kunstatter's method, we derive the area and entropy spectra of the black holes. It is found that the results from both approaches are in full consistency. This implies that one can quantize a black hole via different asymptotic quasinormal modes besides the high damping ones that are usually adopted in the literature. Furthermore, we find that the area and entropy spectra are equidistant and independent of the cosmological constant. However, the spacings depend on the black hole dimension.

关键词： Schwarzschild black entropy

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Bi-block positive semidefiniteness of bi-block symmetric tensors

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Frontiers of Mathematics in China 2021年第1期16卷 141-169页

作者： Zheng-hai H UANG xia LI Yong WANG School of Mathematics Tianjin UniversityTianjin 300354China

The positive definiteness of elasticity tensors plays an important role in the elasticity *** this paper,we consider the bi-block symmetric tensors,which contain elasticity tensors as a ***,we define the bi-block M-eigenvalue of a bi-block symmetric tensor,and show that a bi-block symmetric tensor is bi-block positive(semi)definite if and only if its smallest bi-block M-eigenvalue is(nonnegative)***,we discuss the distribution of bi-block M-eigenvalues,by which we get a sufficient condition for judging bi-block positive(semi)definiteness of the bi-block symmetric tensor ***,we show that several classes of bi-block symmetric tensors are bi-block positive definite or bi-block positive semidefinite,including bi-block(strictly)diagonally dominant symmetric tensors and bi-block symmetric(B)*** give easily checkable sufficient conditions for judging bi-block positive(semi)definiteness of a bi-block symmetric *** a byproduct,we also obtain two easily checkable sufficient conditions for the strong ellipticity of elasticity tensors.

关键词： Bi-block symmetric tensor bi-block symmetric Z-tensor bi-block symmetric B 0-tensor diagonally dominant bi-block symmetric tensor bi-block M-eigenvalue

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