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Predicting colorectal adenomatous polyps in patients with chronic liver disease: A novel nomogram

World Journal of Gastroenterology 2025年第2期31卷 71-84页

作者： yu-Qin Li Wen-Tao Kuai Lin Chen Ming-Hui Zeng Xue-Mei Tao Jia-Xin Han yue-Kui Wang Lian-Xin Xu Li-Ying Ge Yong-Gang Liu Shuang Li Liang Xu yu-qiang Mi Clinical School of the Second People’s Hospital Tianjin Medical UniversityTianjin 300192China Department of Hepatology Tianjin Second People’s HospitalTianjin 300192China Department of Pathology Clinical School of the Second People’s HospitalTianjin 300110China Endoscopy Center Tianjin Second People’s HospitalTianjin 300192China

BACKGROUND Colorectal polyps are commonly observed in patients with chronic liver disease(CLD)and pose a significant clinical concern because of their potential for *** To explore the clinical characteristics of colorectal polyps in patients with CLD,a nomogram was established to predict the presence of adenomatous polyps(AP).METHODS Patients with CLD who underwent colonoscopy at Tianjin Second People’s Hospital from January 2020 to May 2023 were *** data including laboratory results,colonoscopy findings,and pathology reports were *** variables for the nomogram were identified through least absolute shrinkage and selection operator regression,followed by multivariate logistic *** performance of the model was evaluated using the area under the receiver area under curve,as well as calibration curves and decision curve *** The study enrolled 870 participants who underwent colonoscopy,and the detection rate of AP in patients with CLD was 28.6%.Compared to individuals without polyps,six risk factors were identified as predictors for AP occurrence:Age,male sex,body mass index,alcohol consumption,overlapping metabolic dysfunction-associated steatotic liver disease,and serum ferritin *** novel nomogram(AP model)demonstrated an area under curve of 0.801(95%confidence interval:0.756-0.845)and 0.785(95%confidence interval:0.712-0.858)in the training and validation *** curves indicated good agreement among predicted and actual probabilities(training:χ^(2)=11.860,P=0.157;validation:χ^(2)=7.055,P=0.530).The decision curve analysis underscored the clinical utility of the nomogram for predicting the risk of *** The AP model showed reasonable accuracy and provided a clinical foundation for predicting the occurrence of AP in patients with CLD,which has a certain predictive value.

关键词： Metabolic dysfunction associated steatotic liver disease Fatty liver Chronic liver disease Colorectal adenomas Hepatitis Risk factors

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Underwater square-root cubature attitude estimator by use of quaternion-vector switching and geomagnetic field tensor

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Journal of Systems Engineering and Electronics 2020年第4期31卷 804-814页

作者： HUANG yu WU Lihua yu qiang Acoustic Science and Technology Laboratory Harbin Engineering UniversityHarbin 150001China Key Lab of In-fiber Integrated Optics Ministry Education of ChinaCollege of Physics and Optoelectronic EngineeringHarbin Engineering UniversityHarbin 150001China College of Automation Harbin Engineering UniversityHarbin 150001China

This paper presents a kind of attitude estimation algorithm based on quaternion-vector switching and square-root cubature Kalman filter for autonomous underwater vehicle(AUV).The filter formulation is based on geomagnetic field tensor measurement dependent on the attitude and a gyro-based model for attitude propagation. In this algorithm, switching between the quaternion and the three-component vector is done by a couple of the mathematical transformations. Quaternion is chosen as the state variable of attitude in the kinematics equation to time update, while the mean value and covariance of the quaternion are computed by the three-component vector to avoid the normalization constraint of quaternion. The square-root forms enjoy a continuous and improved numerical stability because all the resulting covariance matrices are guaranteed to stay positively semidefinite. The entire square-root cubature attitude estimation algorithm with quaternion-vector switching for the nonlinear equality constraint of quaternion is given. The numerical simulation of simultaneous swing motions in the three directions is performed to compare with the three kinds of filters and the results indicate that the proposed filter provides lower attitude estimation errors than the other two kinds of filters and a good convergence rate.

关键词： attitude estimator geomagnetic field tensor quaternion-vector switching square-root cubature Kalman filter autonomous underwater vehicle(AUV)

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Fuzzy Nash equilibrium of fuzzy n-person non-cooperative game

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Journal of Systems Engineering and Electronics 2010年第1期21卷 47-56页

作者： Xiaohui yu qiang Zhang School of Management and Economics Beijing Institute of Technology Beijing 100081 P. R. China

The fuzzy non-cooperative game with fuzzy payoff function is studied. Based on fuzzy set theory with game theory, the fuzzy Nash equilibrium of fuzzy non-cooperative games is proposed. Most of researchers rank fuzzy number by its center of gravity or by the real number with its maximal membership. By reducing fuzzy number into a real number, we lose much fuzzy information that should be kept during the operations between fuzzy numbers. The fuzzy quantities or alternatives are ordered directly by yuan＇s binary fuzzy ordering relation. In doing so, the existence of fuzzy Nash equilibrium for fuzzy non-cooperative games is shown based on the utility function and the crisp Nash theorem. Finally, an illustrative example in traffic flow patterns of equilibrium is given in order to show the detailed calculation process of fuzzy Nash equilibrium.

关键词： operational research Nash equilibrium preference relations fuzzy game theory.

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Biological clock: the oscillator of gene expression

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Science China(Life Sciences) 2018年第1期61卷 128-130页

作者： qiang yu Shanghai Institute of Materia Media Chinese Academy of Sciences

The 2017 Nobel prize in physiology or medicine was awarded to the discoveries of genes and molecular mechanisms of the circadian rhythm,which is any biological process that oscillates with a period of about 24 *** scientists from the United States,Jeffrey ***,Michael Rosbash,and Michael ***,shared the *** work is of great theoretical value in understanding the nature of life and the interactions of life with its environments.

关键词： Biological clock

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Novel wavelet-homotopy Galerkin technique for analysis of lid-driven cavity flow and heat transfer with non-uniform boundary conditions

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Applied Mathematics and Mechanics(English Edition) 2018年第12期39卷 1691-1718页

作者： qiang yu Hang XU Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE) State Key Laboratory of Ocean Engineering School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University

In this paper, a brand-new wavelet-homotopy Galerkin technique is developed to solve nonlinear ordinary or partial differential equations. Before this investigation,few studies have been done for handling nonlinear problems with non-uniform boundary conditions by means of the wavelet Galerkin technique, especially in the field of fluid mechanics and heat transfer. The lid-driven cavity flow and heat transfer are illustrated as a typical example to verify the validity and correctness of this proposed technique. The cavity is subject to the upper and lower walls’ motions in the same or opposite *** inclined angle of the square cavity is from 0 to π/2. Four different modes including uniform, linear, exponential, and sinusoidal heating are considered on the top and bottom walls, respectively, while the left and right walls are thermally isolated and stationary.A parametric analysis of heating distribution between upper and lower walls including the amplitude ratio from 0 to 1 and the phase deviation from 0 to 2π is conducted. The governing equations are non-dimensionalized in terms of the stream function-vorticity formulation and the temperature distribution function and then solved analytically subject to various boundary conditions. Comparisons with previous publications are given,showing high efficiency and great feasibility of the proposed technique.

关键词： wavelet-homotopy Galerkin technique mixed boundary condition liddriven inclined cavity non-uniform heat transfer

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A Fluctuation Type Limit Theorem for Ji(?)ina Processes with Immigration

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Acta Mathematica Sinica,English Series 2009年第8期25卷 1379-1388页

作者： yu qiang LI School of Finance and Statistics East China Normal University Shanghai 200241 P. R. China

It is proved by the theory of semigroup that the Ornstein-Uhlenbeck type process with jumps can arise from the fluctuation limit of a sequence of Jirina processes with immigration under suitable moments conditions.

关键词： Jirina process with immigration fluctuation limit Ornstein-Uhlenbeck type process

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Limit Distributions for Generalized Jirina Processes with Immigration

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Acta Mathematica Sinica,English Series 2011年第7期27卷 1333-1344页

作者： yu qiang LI School of Finance and Statistics East China Normal University Shanghai 200241 P. R. China

A relationship between continuous state population-size-dependent branching （CSDB） processes with or without immigration and discrete state population-size-dependent branching （DSDB） processes with or without immigration is established via the representation of the former. Based on this relationship, some limiting distributions of CSDB processes with or without immigration are obtained.

关键词： Generalized branching process immigration limiting distribution

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Homotopy Coiflets wavelet solution of electrohydrodynamic flows in a circular cylindrical conduit

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Applied Mathematics and Mechanics(English Edition) 2020年第5期41卷 681-698页

作者： Anyang WANG Hang XU qiang yu State Key Lab of Ocean Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China

In previous studies, the nonlinear problem of electrohydrodynamic(EHD)ion drag flows in a circular cylindrical conduit has been studied by several authors. However, those studies seldom involve the computation for large physical parameters such as the electrical Hartmann number and the magnitude parameter for the strength of the nonlinearity due to the existence of strong nonlinearity in these extreme cases. To overcome this faultiness, the newly-developed homotopy Coiflets wavelet method is extended to solve this EHD flow problem with strong nonlinearity. The validity and reliability of the proposed technique are verified. Particularly, the highly accurate homotopy-wavelet solution is obtained for extreme large parameters, which seems to be overlooked *** about the effects of related physical parameters on the axial velocity field is presented.

关键词： homotopy-wavelet method Coiflets electrohydrodynamic(EHD)flow nonlinear boundary value problem(BVP)

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Exploring Solutions of Nonlinear Rossby Waves with Complete Coriolis Force

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Communications in Theoretical Physics 2009年第7期52卷 185-188页

作者： ZHAO qiang yu Xin School of Physics Peking University Beijing 100871 China

Nonlinear Rossby waves in a Boussinesq fluid model which includes both the vertical and horizontalcomponents of Coriolis force are studied by using the semi-geostrophic approximation and the method of *** series expansion has been employed to isolate the characteristics of the linear Rossby waves and identifythe Rossby cnoidal and solitary *** analysis indicates that if the disturbances are independent of latitude,the effect of horizontal components of Coriolis force disappears.

关键词： Coriolis force Rossby waves semi-geostrophic approximation

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Energy Cycle Insingle Degree of Freedom Conservative Vibration Isolation Systems

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Journal of Beijing Institute of Technology 2019年第3期28卷 644-650页

作者： Gaofeng Guan Dengfeng Xu yu Zhu qiang yu qiang Li School of Mechatronics Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China School of Engineering Information Wuchang University of TechnologyWuhan 430223China

To obtain a longer natural period in single degree of freedom(SDF) conservative vibration isolation systems, many scholars have proposed different methods. This paper uncovers a clockwise energy cycle existing in a mass-spring system, in which the potential energy and kinetic energy convert with each other, and the natural period is determined by the magnitude of the energy cycle. Compared to water flow inside a pipe, the previous methods can be consolidated into two methods to make the energy cycle narrower;one is to optimize the parameters directly, the other is to indirectly add an anticlockwise energy cycle to the original one. The anticlockwise energy cycle has the characteristic of gravitational potential energy or elastic potential energy that reduces with displacement. The highly abstract method can provide a better optimization tool to design a practice system.

关键词： vibration isolation natural period energy cycle potential energy kinetic energy

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