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World Journal of Gastroenterology 2025年第2期31卷 42-51页

作者： Wen-Chong Zhen Jing Sun Xue-Ting Bai Qian Zhang Zi-Han li Yi-Xin Zhang Rong-Xuan Xu Wei Wu Zhi-Han Yao Chun-Wen Pu xiao-feng li School of Public Health Dalian Medical UniversityDalian 116044Liaoning ProvinceChina Graduate School Dalian Medical UniversityDalian 116044Liaoning ProvinceChina Dalian Public Health Clinical Center Dalian Municipal Research Institute for Public HealthDalian 116001Liaoning ProvinceChina Department of Epidemiology and Health Statistics Dalian Medical UniversityDalian 116044Liaoning ProvinceChina

BACKGROUND Chronic hepatitis B often progresses silently toward hepatocellular carcinoma(HCC),a leading cause of mortality *** detection of HCC is crucial,yet *** To investigate the role of dynamic changes in alkaline phosphatase to prealbumin ratio(APR)in hepatitis B progression to *** Data from 4843 patients with hepatitis B(January 2015 to January 2024)were *** incidence rates in males and females were compared using the log-rank *** were evaluated using Kaplan–Meier *** linear Mixed-Effects Model was applied to track the fluctuation of APR levels over ***,Joint Modeling of Longitudinal and Survival data was employed to investigate the temporal relationship between APR and HCC *** The incidence of HCC was higher in *** ensure the model’s normality assumption,this study applied a logarithmic transformation to APR,yielding *** levels were higher in females(t=5.26,Pline APR link,rising APR indicates a higher HCC risk.

关键词： Alkaline phosphatase to prealbumin ratio Chronic hepatitis B patients Hepatocellular carcinoma Retrospective cohort study linear Mixed-Effect Mode Joint Modelling of Longitudinal and Survival data

Conditional Random Field Tracking Model Based on a Visual Long Short Term Memory Network

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Journal of Electronic Science and Technology 2020年第4期18卷 308-319页

作者： Pei-Xin liu Zhao-Sheng Zhu xiao-feng Ye xiao-feng li School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731

In dense pedestrian tracking,frequent object occlusions and close distances between objects cause difficulty when accurately estimating object *** this study,a conditional random field tracking model is established by using a visual long short term memory network in the three-dimensional(3D)space and the motion estimations jointly performed on object trajectory *** visual field information is added to the long short term memory network to improve the accuracy of the motion related object pair selection and motion *** address the uncertainty of the length and interval of trajectory segments,a multimode long short term memory network is proposed for the object motion *** tracking performance is evaluated using the PETS2009 *** experimental results show that the proposed method achieves better performance than the tracking methods based on the independent motion estimation.

关键词： Conditional random field(CRF) long short term memory network(LSTM) motion estimation multiple object tracking(MOT)

On the Blaschke Isoparametric Hypersurfaces in the Unit Sphere

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Acta Mathematica Sinica,English Series 2009年第4期25卷 657-678页

作者： Xing xiao li feng Yun ZHANG Department of Mathematics. He'nan Normal University Xinxiang 453007 P. R. China

Given an immersed submanifold x ： M^M → S^n in the unit sphere S^n without umbilics, a Blaschke eigenvalue of x is by definition an eigenvalue of the Blaschke tensor of x. x is called Blaschke isoparametric if its Mobius form vanishes identically and all of its Blaschke eigenvalues are constant. Then the classification of Blaschke isoparametric hypersurfaces is natural and interesting in the MSbius geometry of submanifolds. When n = 4, the corresponding classification theorem was given by the authors. In this paper, we are able to complete the corresponding classification for n = 5. In particular, we shall prove that all the Blaschke isoparametric hypersurfaces in S^5 with more than two distinct Blaschke eigenvalues are necessarily Mobius isoparametric.

关键词： Mobius form Blaschke eigenvalues Blaschke tensor Mobius metric Mobius second fundamental form

Immersed Hypersurfaces in the Unit Sphere S^(m+1) with Constant Blaschke Eigenvalues

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Acta Mathematica Sinica,English Series 2007年第3期23卷 533-548页

作者： Xing xiao li feng Yun ZHANG Department of Mathematics He'nan Normal University Xinxiang 453007 He'nan P. R. China

For an immersed submanifold x ： M^m→ Sn in the unit sphere S^n without umbilics, an eigenvalue of the Blaschke tensor of x is called a Blaschke eigenvalue of x. It is interesting to determine all hypersurfaces in Sn with constant Blaschke eigenvalues. In this paper, we are able to classify all immersed hypersurfaces in S^m＋1 with vanishing MSbius form and constant Blaschke eigenvalues, in case （1） x has exact two distinct Blaschke eigenvalues, or （2） m = 3. With these classifications, some interesting examples are also presented.

关键词： Moebius form Blaschke eigenvalues Blaschke tensor MSbius metric MSbius second fundamental form

MDA-Based 3G Service Creation Approach and Telecom Service Domain Meta-Model

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The Journal of China Universities of Posts and Telecommunications 2006年第2期13卷 54-60页

作者： QIAO Xiu-quan li xiao-feng li Yan State Key Laboratory of Networking and Switching Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

This paper presents a model-driven 3G service creation approach based on model driven architecture technology. The focus of the paper is the methodology of designing telecommunication service-related meta-model and its profile implementation mechanism. This approach enhances the reusability of applications through separation of service logic models from concrete open application programming interface technologies and implementation technologies.

关键词： 3G service creation environment MDA meta-model UML profile

An Extension Landau-lifshitz Model in Studying Soft Ferromagnetic Films

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Acta Mathematicae Applicatae Sinica 2007年第3期23卷 421-432页

作者： Jing-na li xiao-feng Wang Zheng-an Yao Department of Mathematics Sun Yat-sen University Guangzhou 510275 China

In this paper, we propose a model in studying soft ferromagnetic films, which is readily accessible experimentally. By using penalty approximation and compensated compactness, we prove that the dynamical equation in t... 详细信息

关键词： Landau-lifshitz equation thin film, penalty approximation, compensated compactness

Impulsive Synchronization of Laser Plasma System

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Communications in Theoretical Physics 2007年第6期47卷 1067-1072页

作者： li Yang liAO xiao-feng li Chuan-Dong CHEN Guo Department of Computer Science and Engineering Chongqing University Chongqing 400044 China

The issue of impulsive synchronization of the coupled chaotic laser plasma system is investigated. A new framework for impulsive synchronization of such chaotic systems is presented, which makcs the synchronization error system a linear impulsive control system. We derive some suffcient conditions for the synchronization of a laser plasma system via impulsive control with the varying impulsive intervals, which allows us to derive the impulsive synchronization law easily. To illustrate the effectiveness of the proposed results, two numerical examples are given.

关键词： chaos impulsive stabilization impulsive control impulsive synchronization

Rheo-optic in situ synchronous study on the gelation behaviour and mechanism of waxy crude oil emulsions

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Petroleum Science 2023年第2期20卷 1266-1288页

作者： Jian Zhao xiao-feng li Hang Dong Zhi-Hua Wang Young and Middle-aged Innovation Team Program of Northeast Petroleum University Energy-saving and Consumption-reducing LaboratorySurface Engineering Pilot Test Center of CNPCNortheast Petroleum UniversityDaqingHeilongjiang 163318China

An improved rheo-optic in situ synchronous measurement system was employed to investigate the gelation behaviour and mechanism of waxy crude oil emulsions. By combining transmitted natural light and reflected polarized light microscopy, a multiangle composite light source was built to achieve the simultaneous observation of wax crystals and emulsified water droplets, as well as their dynamic aggregation process. Main outcomes on the microscopic mechanism were obtained by developed microscopic image processing method. It was found that the microstructure of W/O waxy crude oil emulsion has the evolution of “individual structure--homogeneous aggregate structure--heterogeneous coaggregate structure--floc structure” during the static cooling, which results in the four stages during gelation process. Different from previous studies, the aggregation of emulsified water droplets was found to be more significant and contributes to the formation and development of the wax crystals-emulsified water droplets coaggregate, which plays a decisive role in the further evolution of the gelled microstructure. Time series microscopic images show the dynamic aggregation of emulsified water droplets and wax crystals. Two different aggregation behaviours between wax crystals and water droplets were observed. That wax crystals can not only embed in gaps between adjacent water droplets and enhance the structure, but also surround the outside of the water droplets and continue to grow resulting in the interconnection of different coaggregates to form a larger floc structure. In addition, correlation between viscoelasticity and microstructure evolution of waxy crude oil emulsions of different water contents was discussed. With increasing water contents, the microstructure is changed from wax crystal flocculation structure as the main skeleton and the emulsified water droplets embedded in it, into the aggregation of emulsified water droplets occupying the main position. When the number of wax

关键词： Waxy crude oil emulsion Rheo-optic in situ synchronous measurement Gelation Microscopic mechanism Structural behaviour

Reference model of future ubiquitous convergent network and context-aware telecommunication service platform

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 50-56页

作者： QIAO Xiu-quan li xiao-feng liANG Shou-qing State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

A reference model for future ubiquitous convergent network is analyzed. To provide user-centric, intelligent, personalized service, this article presents a context-aware telecommunication service platform （CaTSP） to adapt to dynamically changing context. This article focuses on the new design method of context-aware telecommunication service platform and its architecture. Through the use of model-driven architecture （MDA） and semantic web technologies, CaTSP can enable context reasoning and service personalization adaption. This article explores a new approach for service intelligence, personalization, and adaptability in the semantic web service computing era.

关键词： ubiquitous convergent network context-aware,telecommunication service platform ontology OWL OWL-S,model-driven architecture

On Impulsive Control for Synchronization and Its Application to Matsumoto-Chua-Kobayashi （MCK） Circuit

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Communications in Theoretical Physics 2007年第2X期48卷 275-278页

作者： li Yang liAO xiao-feng li Chuan-Dong WANG Yong College of Computer Science and Engineering Chongqing University Chongqing 400030 China

The issue of impulsive control theory for synchronization of the MCK circuit is developed. We propose an impulsive control scheme for the complete synchronization of the MCK circuit including chaotic systems. A sufficient condition for the impulsive control is derived, with an easily calculated maximum impulsive interval. The proposed impulsive control scheme is applied to the MCK circuit and the simulation result demonstrates the effectiveness of the method.

关键词： chaos impulsive control MCK circuit