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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.

Modified unscented particle filter for nonlinear Bayesian tracking

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Journal of Systems Engineering and Electronics 2008年第1期19卷 7-14页

作者： Zhan Ronghui Xin qin wan Jianwei School of Electronic Science and Engineering National Univ. of Defense Technology. Changsha 410073 P. R. China

A modified unscented particle filtering scheme for nonlinear tracking is proposed, in view of the potential drawbacks （such as, particle impoverishment and numerical sensitivity in calculating the prior） of the conventional unscented particle filter （UPF） confronted in practice. Specifically, a different derivation of the importance weight is presented in detail. The proposed method can avoid the calculation of the prior and reduce the effects of the impoverishment problem caused by sampling from the proposal distribution, Simulations have been performed using two illustrative examples and results have been provided to demonstrate the validity of the modified UPF as well as its improved performance over the conventional one.

关键词： Bayesian estimation modified unscented particle filter nonlinear filtering unscented Kalman filter

Modeling of Strip Temperature in Rapid Cooling Section of Vertical Continuous Annealing Furnace

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Journal of Iron and Steel Research International 2012年第11期19卷 27-32页

作者： wan Fei wanG Yong-qin qin Shu-ren State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China Baosteel Engineering and Technologies Group Co Ltd Shanghai 201900China

The strip temperature is affected by many factors in rapid cooling section （RCS） of the vertical continuous annealing furnace （VCAF）. They can he divided into four types： the physical properties of cooling gas, the geometry characteristics of configuration of cooling equipment, the heat transfer between the strip and the cooling gas, and the conductivity of the strip. It aims to model the strip temperature in the cooling section based on the fundamental heat transfer theory and the four aspects factors. The model for transient Nusselt number is obtained by considering Reynolds number, Prandtl number and geometry characteristics of RCS. Then cooling model of the strip transient temperature is built by Nusselt number, heat transfer coefficient and heat conductivity of the strip. The results are compared with the data from production line. The comparisons indicate that the model can well predict cooling temperature of the strip. It is hoped that the proposed model can be used for design and control of the vertical continuous annealing furnace.

关键词： rapid cooling jet impinging convection heat transfer coefficient

Modeling of Strip Heating Process in Vertical Continuous Annealing Furnace

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Journal of Iron and Steel Research International 2012年第5期19卷 29-36页

作者： wan Fei wanG Yong-qin qin Shu-ren The State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China

The mechanism for heat transfer of radiation is usually adopted to heat strip in vertical continuous annealing furnace. The rate of heat transfer among strip and other objects can be hugely affected by the parameters of strip speed, geometry factors and radiating characteristic of surfaces of strip, radiating tubes and walls of furnace. A model including all parameters is proposed for calculating the heat transfer coefficient, predicting the strip tempera- ture and boundary temperature of strip through analyzing these parameters. The boundary temperature is a important datum and different from average arithmetic value of temperature of strip and temperature in furnace. Also, the model can be used to analyze the relation for temperature of strip and heat transfer coefficient, total heat transfer quantity and heating time. The model is built by using the radiating heat transfer rate, the Newtonrs law of cooling, and lumped system analysis. The results of calculation are compared to the data from production line. The comparisons indicate that the model can well predict the heating process. The model is already applied for process control in pro- duction line. Also, this research will provide a new method for analyzing the radiation heat transfer.

关键词： vertical continuous annealing furnace (VCAF) radiation tube section (RTS) radiation heat transfer heat transfer coefficient heat transfer rate

Strategies for improving the efflcacy of immunotherapy in hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2022年第5期21卷 420-429页

作者： ying Zhu Lun-Xiu qin Department of General Surgery Huashan HospitalCancer Metastasis InstituteFudan UniversityShanghai 200040China Institutes of Biomedical Sciences Fudan UniversityShanghai 200032China

Primary liver cancer,mainly hepatocellular carcinoma(HCC),is the sixth most diagnosed cancer and third leading cause of cancer-related death ***,immunotherapies such as immune checkpoint inhibitors(ICIs)have made great progress in the systemic treatment of ***,anti-PD-1 therapy with pembrolizumab or nivolumab as a single agent did not meet their predefined end points of overall survival in the KEYNOTE-240 and Check Mate 459 *** is urgent to understand the immunological rationale and explore novel ways to improve the efflcacy of *** combination of ICIs with other therapies,such as tyrosine kinase inhibitors(TKIs),monoclonal antibodies,or local therapy,has been demonstrated to improve overall response rate and *** addition,modulating tumor microenvironment is a potential way to overcome the primary and secondary resistance to *** this review,we summarized the latest findings in the immune microenvironment,the mechanisms of their synergistic effects when combined with anti-VEGF agents or TKIs,as well as other kinds of immune treatment.

关键词： Hepatocellular carcinoma Tumor microenvironment Immune checkpoint inhibitors Interferon-α Programmed death receptor 1

Spiking Behavior in Chua＇s Circuit

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Chinese Physics Letters 2010年第6期27卷 24-26页

作者： JI ying BI qin-Sheng Faculty of Science Jiangsu University Zhenjiang 212013

Chua ＇s circuit with a slow-fast effect is established under certain parameter conditions. The dynamics of this slow- fast system is investigated. A spiking phenomenon can be observed in the numerical simulation. By introducing slow-fast analysis and a generalized Jacobian matrix at the non-smooth boundaries, the bifurcation mechanism for the periodic spiking solution, different from the smooth case, is discussed.

关键词： Underfeeding Spikes

Multiple primary malignant tumors of upper gastrointestinal tract:A novel role of ^(18)F-FDG PET/CT

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World Journal of Gastroenterology 2010年第31期16卷 3964-3969页

作者： Long Sun Yong-Hong Sun Long Zhao Zuo-Ming Luo Hua Wu ying wan qin Lin Minnan PET Center the First Affiliated Hospital of Xiamen University Xiamen 361003 Fujian Province China College of Life Science and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China Department of Radiation Xiamen 316003 China

AIM: To evaluate the capacity of 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) for detecting multiple primary cancer of upper gastrointestinal (UGI) tract. METHODS: Fifteen patients (12 without cancer histories and 3 with histories of upper GI tract cancer) were investigated due to the suspicion of primary cancer of UGI tract on X-ray barium meal and CT scan. Subsequent whole body 18F-FDG PET/CT scan was carried out for initial staging or restaging. All the patients were fi nally confi rmed by endoscopic biopsy or surgery. The detection rate of multiple primary malignant cancers was calculated based on 18F-FDG PET/CT and endoscopic ***: 18F-FDG PET/CT scan was positive in 32 suspicious lesions, 30/32 were true positive primary lesions, and 2/32 were false positive. In 15 suspicious lesions with negative 18F-FDG PET/CT scan, 12/15 were true negative and 3/15 were false negative. Among the 15 patients, 12 patients had 29 primary synchronous tumors confirmed by pathology, including 8 cases of esophageal cancers accompanied with gastric cancer and 4 of hypopharynx cancers with esophageal cancer. The other 3 patients had 4 new primary metachronous tumors, which were multiple primary esophageal cancers. PET/CT imaging detected local lymph node metastases in 11 patients. Both local lymph node metastases and distant metastases were detected in 4 patients. On a per-primary lesion basis, the sensitivity, specificity, accuracy, negative predictive value and positive predictive value of 18F-FDG PET/CT for detecting multiple primary cancer of UGI tract were 90.9%, 85.7%, 89.4%, 80% and 93.7%, respectively. CONCLUSION: The whole body 18F-FDG PET/CT may play an important role in evaluating the multiple primary malignant tumors of UGI tract cancer.

关键词： Upper gastrointestinal tract cancer Esophageal cancer Gastric cancer Positron emission tomography/computed tomography 18F-fluorodeoxyglucose

States and transitions in mixed networks

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Frontiers of physics 2014年第4期9卷 523-528页

作者： ying Zhang Wen-Hui wan Department of Physics Beijing Normal University Beijing 100875 China Department of Physics Beijing Institute of Technology Beijing 100081 China

A network is named as mixed network if it is composed of N nodes, the dynamics of some nodes are periodic, while the others are chaotic. The mixed network with all-to-all coupling and its correspond- ing networks after the nonlinearity gap-condition pruning are investigated. Several synchronization states are demonstrated in both systems, and a first-order phase transition is proposed. The mixture of dynamics implies any kind of synchronous dynamics for the whole network, and the inixed networks may be controlled by the nonlinearity gap-condition pruning.

关键词： mixed network phase transition synchronization state

Perturbation of the Moore–Penrose Metric Generalized Inverse in Reflexive Strictly Convex Banach Spaces

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Acta Mathematica Sinica,English Series 2016年第6期32卷 725-735页

作者： Jian Bing CAO wan qin ZHANG Postdoctoral Research Base He'nan Institute of Science and Technology Postdoctoral Research Station of Physics He'nan Normal University Department of Mathematics He'nan Institute of Science and Technology

Let X, Y be reflexive strictly convex Banach spaces, let T, δT ： X → Y be bounded linear operators with closed range R（T）. Put T= T ＋ δT. In this paper, by using the concept of quasiadditivity and the so called generalized Neumman lemma, we will give some error estimates of the bounds of ｜｜T^M｜｜. By using a relation between the concepts of the reduced minimum module and the gap of two subspaces, some new existence characterization of the Moore-Penrose metric generalized inverse T^M of the perturbed operator T will be also given.

关键词： Metric generalized inverse perturbation reflexive strictly convex Banach space