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Effective method for tracking multiple objects in real-time visual surveillance systems

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Journal of Systems Engineering and Electronics 2009年第6期20卷 1167-1178页

作者： Wang Yaonan Wan qin yu Hongshan Coll. of Electrical and Information Engineering Hunan Univ. Changsha 410082 P. R. China

An object model-based tracking method is useful for tracking multiple objects, but the main difficulties are modeling objects reliably and tracking objects via models in successive frames. An effective tracking method using the object models is proposed to track multiple objects in a real-time visual surveillance system. Firstly, for detecting objects, an adaptive kernel density estimation method is utilized, which uses an adaptive bandwidth and features combining colour and gradient. Secondly, some models of objects are built for describing motion, shape and colour features. Then, a matching matrix is formed to analyze tracking situations. If objects are tracked under occlusions, the optimal ＂visual＂ object is found to represent the occluded object, and the posterior probability of pixel is used to determine which pixel is utilized for updating object models. Extensive experiments show that this method improves the accuracy and validity of tracking objects even under occlusions and is used in real-time visual surveillance systems.

关键词： visual surveillance multiple object tracking object model matching matrix.

Recent Progress in π-Conjugated Polymer-Inorganic Heterostructures for Photocatalysis

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Chinese Journal of Structural Chemistry 2022年第9期41卷 56-68页

作者： yu-qin Xing Shi-Yong Liu Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China

Polymer-inorganic(P-Ⅰ) soft-hard heterostructures & heterojunction photocatalysts,featured by large interfacial contact, efficient charge separation, broad light absorption and maximized redox capacity, have received great attention for their applications in energy conversion and environmental remediation. In this minireview, the classification and mechanism of P-Ⅰ heterojunctions, i.e., type-Ⅰ/Ⅱ, p-n, Z-scheme and S-scheme heterojunctions, and their preparation methods are firstly introduced. Next, the photocatalytic applications of P-Ⅰ heterojunctions, including water splitting, environmental remediation and carbon dioxide reduction, are extensively reviewed. Lastly,a brief summary and perspectives on ongoing challenges and opportunities to construct high performance P-Ⅰ soft-hard photocatalysts are intensively highlighted. We envision this review will provide a picture of the state-of-the-art achievements and promote the photocatalytic applications of P-Ⅰ heterostructures in energy conversion and environmental remediation.

关键词： polymer-inorganic hybrid heterojunction photocatalytic water splitting photocatalytic CO_(2)reduction photocatalytic environmental remediation

Thermodynamics and microstructures of Euler–Heisenberg black hole in a cavity

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Communications in Theoretical Physics 2023年第9期75卷 91-103页

作者： qin yu Qi Xu Jun Tao Center for Theoretical Physics College of PhysicsSichuan UniversityChengdu610065China

Euler–Heisenberg black holes with quantum electrodynamics(QED) correction are embraced by a cavity in this paper, which serves as a boundary of the black hole spacetime and contributes to the equilibrium of the system. We explore the thermodynamic properties of the black hole, including the phase transitions and phase structures. The small/large black hole phase transition occurs for a negative QED parameter, while the reentrant phase transition can be observed for a small positive QED parameter. Then the thermodynamic geometry is investigated to diagnose microscopic interactions of black hole thermodynamic systems. For the reentrant phase transition, the small black holes are dominated by repulsion for the first-order coexistence curve, while the interaction between the small black hole molecules could be attractive or repulsive for the small/large black hole phase transition.

关键词： black hole thermodynamics phase transition microstructure

Detecting micro-blog user interest communities through the integration of explicit user relationship and implicit topic relations

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Science China(Information Sciences) 2017年第9期60卷 64-77页

作者： yu qin Zhengtao yu Yanbing WANG Shengxiang GAO Linbin SHI Institute of Information Engineering and Automation Kunming University of Science and Technology Key Laboratory of Intelligent Information Processing Kunming University of Science and Technology

In order to effectively utilize the explicit user relationship and implicit topic relations for the detection of micro-blog user interest communities, a micro-blog user interest community(MUIC) detection approach is proposed. First, through the analysis of the follow relationship between users, we have defined three types of such relationships to construct the user follow-ship network. Second, taking the semantic correlation between user tags into account, we construct the user interest feature vectors based on the concept of feature mapping to build a user tag based interest relationship network. Third, user behaviors, such as reposting, commenting, replying, and receiving comments from others, are able to provide certain guidance for the extraction of micro-blog topics. Hence, we propose to integrate the four mentioned user behaviors that are considered to provide guidance information for the traditional latent Dirichlet allocation(LDA) model. Thereby, in addition to the construction of a topic-based interest relationship network, a guided topic model can be built to extract the topics in which the user is interested. Finally, with the integration of the afore-mentioned three types of relationship network, a micro-blog user interest relationship network can be created. Meanwhile, we propose a MUIC detection algorithm based on the contribution of the neighboring nodes. The experiment result proves the effectiveness of our approach in detecting MUICs.

关键词： feature mapping implicit topic guided topic model contribution of the neighboring nodes

θ-improved limited tolerance relation model of incomplete information system for evaluation of water conservancy project management modernization

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Water Science and Engineering 2013年第4期6卷 469-477页

作者： yu-qin GAO Guo-hua FANG Ya-qin LIU College of Water Conservancy and Hydropower Engineering Hohai University

The modernization of water conservancy project management is a complicated engineering system involving a management system, a management method, management personnel, the exertion of social, economic, and ecological effects, and so on. However, indices for evaluating the modernization of water conservancy project management are usually unobtainable in practical applications. Conducting appropriate extension of the classical rough set theory and then applying it to an incomplete information system are the key to the application of the rough set theory Based on analysis of some extended rough set models in incomplete information systems, a rough set model based on the θ-improved limited tolerance relation is put forward. At the same time, upper approximation and lower approximation are defined under this improved relation. According to the evaluation index system and management practices, the threshold for θ is defined. An example study indicates the practicability and maneuverability of the model.

关键词： Key words: modernization of water conservancy project management O-improved limitedtolerance relation model," upper and lower approximations," threshold

Quantized vortices in spinor Bose–Einstein condensates with time–space modulated interactions and stability analysis

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Chinese Physics B 2020年第10期29卷 227-232页

作者： yu-qin Yao Ji Li Department of Applied Mathematics China Agricultural UniversityBeijing 102206China Department of Physics Taiyuan Normal UniversityTaiyuan 030031China

The three-component Gross–Pitaevskii equation with an angular momentum rotational term can be served as a model to study spinor Bose–Einstein condensates (BECs) with time–space modulated interactions. Vortex solutions of the spinor BECs with spatiotemporally modulated interactions are worked out by similarity transformation. Theoretical analysis and numerical simulation of vortex states are demonstrated. Stable vortex states are obtained by adjusting the frequency of the external potential and the spatiotemporally modulated interaction.

关键词： spinor Bose-Einstein condensates spatiotemporal modulation vortex solution dynamical stability

Study of a smart platform based on backstepping control method

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Earthquake Engineering and Engineering Vibration 2017年第3期16卷 599-608页

作者： Li Luyu Cheng Baowei Zhang yu qin Han State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China School of Civil Engineering Dalian University of Technology Dalian 116024 China School of Electronic Engineering Dalian University of Technology Dalian 116024 China

A structural model is significant for the verification of structural control algorithms. However, for nonlinear behavior, experiments are mostly destructive tests that are costly, and conducting repetitive structural experiments is difficult. Therefore, a repetitive structural vibration model is important for structural vibration control. In this study, a smart platform to realize different structural behaviors is developed based on the backstepping control algorithm. Lyapunov functions are used to derive the control law. Simulations show that the designed model can track the structural responses of different arbitrary linear structures very well. In addition, the proposed platform can track responses of different piecewise linear structures and desired models with various hysteresis very well. Numerical results verify the effectiveness of the proposed tracking controller through the backstepping method for the established platform.

关键词： repetitive model backstepping controller piecewise linear hysteresis

Response to temperature stress of reactive oxygen species scavenging enzymes in the cross-tolerance of barley seed germination

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第12期11卷 965-972页

作者： yu-qin MEI Song-quan SONG Institute of Botany Chinese Academy of Sciences Beijing 100093 China

A number of studies have shown the existence of cross-tolerance in plants, but the physiological mechanism is poorly understood. In this study, we used the germination of barley seeds as a system to investigate the cross-tolerance of low-temperature pretreatment to high-temperature stress and the possible involvement of reactive oxygen species （ROS） scavenging enzymes in the cross-tolerance. After pretreatment at 0 ℃ for different periods of time, barley seeds were germinated at 35 ℃, and the content of malondialdehyde （MDA） and the activities of ROS scavenging enzymes were measured by a spectrophotometer analysis. The results showed that barley seed germinated very poorly at 35 ℃, and this inhibitive effect could be overcome by pretreatment at 0 ℃. The MDA content varied, depending on the temperature at which seeds germinated, while barley seeds pretreated at 0 ℃ did not change the MDA content. Compared with seeds germinated directly at 35 ℃, the seeds pretreated first at 0 ℃ and then germinated at 35 ℃ had markedly increased activities of superoxide dismutase （SOD）, ascorbate peroxidase （APX）, catalase （CAT）, and glutathione reductase （GR）. The SOD and APX activities of seeds germinated at 35 ℃ after 0 ℃-pretreatment were even substantially higher than those at 25 ℃, and GR activity was similar to that at 25 ℃, at which the highest germination performance of barley seeds was achieved. These results indicate that low-temperature pretreatment can markedly increase the tolerance of barley seed to high temperature during germination, this being related to the increase in ROS scavenging enzyme activity. This may provide a new method for increasing seed germination under stress environments, and may be an excellent model system for the study of cross-tolerance.

关键词： Barley seed Cross-tolerance Germination/growth Reactive oxygen species (ROS) scavenging enzyme,Pretreatment at low temperature Temperature stress

BOPl Silencing Suppresses Gastric Cancer Proliferation through p53 Modulation

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Current Medical Science 2021年第2期41卷 287-296页

作者： yu-peng YANG Rui-huan qin Jun-jle ZHAO Xin-yu qin Department of General Surgery Zhongshan HospitalFudan UniversityShanghai 200032China Chinese Institute for Brain Research Beijing 102206China

Block of proliferation 1(BOP1)is a key protein involved in ribosome maturation and affects cancer ***,its role in gastric cancer(GC)remains *** study aimed to explore the expression of BOPI in GC and its potential mechanisms in regulating GC growth,and the relationship between BOP1 level in cancer tissues and survival was also *** expression of BOPI was examined by immunohistochemistry(IHC)in a cohort containing 387 patients with primary *** GC cells were treated by siRNA to knock down the BOP1 expression,and examined by CCK-8 assay and plate clone formation to assess cell proliferation in *** rate of cultured GC cells was detected by flow cytometry with double staining of AnnxinV/*** xenografted mouse model was used to assess GC cell proliferation in *** blot and IHC were also performed to detect the expression levels of BOP1,p53 and *** with higher level of BOP1 in cancer tissues had significantly poorer ***1 silencing signifcantly suppressed GC cell proliferation both in vitro and in *** blocked cell cycle at G0/G1 phase and led to apoptosis of GC cells via upregulating p53 and ***1 silencing-induced suppression of cell proliferation was partly reversed by pifithrin-a,(a p53 inhibitor).Our study dermonstrated that BOP1 up-regulation may be a hallmark of GC and it may regulate proliferation of GC cells by activating ***1 might be considered a novel biomarker of GC proliferation,and could be a potential indicator of prognosis of GC ***1 might also be a potential target for the treatment of GC patients if further researched.

关键词： gastric cancer block of proliferation 1 cell proliferation p53