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3D打印技术辅助前交叉韧带重建治疗前交叉韧带断裂的研究

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中国疗养医学 2025年第1期34卷 109-112页

作者：王社光洛阳市孟津区中医院骨伤科河南洛阳471100

目的探讨关节镜下前交叉韧带(ACL)重建术治疗ACL断裂使用3D打印技术的辅助效果。方法选择2021年1月至2023年12月洛阳市孟津区中医院收治的102例ACL断裂患者,按照随机数字表分为3D打印组(n=51)和对照组(n=51)。对照组患者实施常规关节镜... 详细信息

目的探讨关节镜下前交叉韧带(ACL)重建术治疗ACL断裂使用3D打印技术的辅助效果。方法选择2021年1月至2023年12月洛阳市孟津区中医院收治的102例ACL断裂患者,按照随机数字表分为3D打印组(n=51)和对照组(n=51)。对照组患者实施常规关节镜下ACL重建术治疗,3D打印组行关节镜下3D打印技术辅助ACL重建术治疗。对比围术期指标、膝关节功能[国际膝关节主观功能评分(IKDC)、膝关节Lysholms评分]、膝关节活动范围、并发症。结果比较两组股骨骨隧道长度、住院时间,差异无统计学意义(P>0.05);相比于对照组,3D打印组手术时间短,差异有统计学意义(P<0.05);两组术后Lysholms评分、IKDC评分均高于术前,而3D打印组IKDC评分为(96.32±7.26)分、Lysholms评分为(94.25±3.85)分,高于对照组的(82.66±6.54)分、(88.20±8.25)分,差异有统计学意义(P<0.05);术后两组膝关节活动度均高于术前,而3D打印组膝关节活动度为(119.25±7.66)°,高于对照组的(98.66±8.22)°,差异有统计学意义(P<0.05);两组术后均无移植物断裂、移植物撞击、感染、深静脉血栓等并发症发生。结论关节镜下3D打印技术辅助ACL重建术治疗ACL断裂可缩短手术用时,改善患者膝关节活动度、膝关节功能,缩短住院时间,安全性较高。

关键词：前交叉韧带断裂关节镜前交叉韧带重建术 3D打印技术膝关节功能

Study on the Distributed Routing Algorithm and Its Security for Peer-to-Peer Computing

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Journal of Electronic Science and Technology of China 2005年第2期3卷 187-188页

作者： zhoushi-jie SchoolofComputerScienceandEngineeringUniversityofElectronicScienceandTechnologyofChinaChengdu610054China

By virtue of its great efficiency and graceful architecture, the Client/Server model has been prevalent for more than twenty years, but some disadvantages are also recognized. It is not so suitable for the next generation Internet (NGI), which will provide a high-speed communication platform. Especially, the service bottleneck of Client/Server model will become more and more severe in such high-speed networking environment. Some approaches have been proposed to solve such kind of disadvantages. Among these, distributed computing is considered an important candidate for Client/Server model.

关键词： peer-to-peer computing P2P distributed computing information security distributed routing algorithm bidding-electing algorithm one-way accumulator

Stabilization via Fully Actuated System Approach:A Case Study

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Journal of Systems Science & Complexity 2022年第3期35卷 731-747页

作者： DUAN guang-Ren Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China

In this note,a benchmark example system which is not stabilizable by a smooth state feedback controller is considered with the fully actuated system(FAS)*** is shown that a smooth controller exists which drives the trajectories starting from a large domain in the initial value space to the origin *** a result brings about a generalization of Lyapunov asymptotical stability,which is termed as global exponential *** region of attraction is allowed to be an unbounded open set of the initial values with closure containing the *** sub-stability result may be viewed to be superior to some local stability results in the Lyapunov sense because the region of attraction is much larger than any finite ball containing the origin and meanwhile the feasible trajectories are always driven to the origin *** on this sub-stabilization result,globally asymptotically stabilizing controllers for the system can be provided in two general ways,one is through combination with existing globally stabilizing controllers,and the other is by using a pre-controller to first move an initial point which is not within the region of attraction into the region of attraction.

关键词： Feedback stabilization fully actuated system approach nonlinear systems region of attraction singularity sets

Brockett's Second Example:A FAS Approach Treatment

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Journal of Systems Science & Complexity 2023年第5期36卷 1789-1808页

作者： DUAN guang-Ren Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and TechnologyShenzhen 518055China Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China

In this paper,several equivalent forms of the well-known Brockett's second example system are firstly *** stabilization of the system is then treated in the fully actuated system approach.A simple continuous time-invariant sub-stabilizing controller is designed,and the corresponding region of attraction is *** a result,all trajectories of the system starting from the characterized region of attraction are driven exponentially to the *** the region of attraction is very large,the designed sub-stabilizing controller can be directly useful in many practical *** cases where the initial values are indeed needed to be chosen out of the region of attraction,extremely simple pre-controllers can be designed,which drive the system trajectories into the designed region of attraction.A simulation of the designed control system is carried out to show the effect of the proposed approach.

关键词： Brockett integrator continuous time-invariant controllers fully actuated system approach region of attraction sub-stabilization

A Novel Method for Forecasting Freak Wave Occurrence in A Short Crested Coastal Sea

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China Ocean Engineering 2024年第1期38卷 104-116页

作者： WANG Ying-guang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Ocean and Civil Engineering Shanghai Jiao Tong UniversityShanghai 200240China

In order to forecast the distribution of crest amplitudes and the occurrence of freak waves in a short crested coastal sea,a novel transformed linear simulation method is initially proposed in this paper.A Hermite transformation model expressed as a monotonic cubic polynomial serves as the foundation for the novel simulation *** wave crest amplitude exceedance probabilities of two sea states-one with a directional wave spectrum based on the measured wave elevation data at the Yura coast and the other with a typical directional JONSWAP wave spectrum-have been predicted using the novel simulation method that has been *** likelihood that a particular critical wave crest amplitude will be exceeded is directly correlated with the probability that freak waves will *** is shown that the novel simulation approach suggested can provide predictions that are more precise than those obtained from the Rayleigh crest amplitude distribution model,the Jahns and Wheeler crest amplitude distribution model,or the conventional linear simulation *** study also demonstrated that the nonlinear simulation method is less effective than the novel simulation method in terms of efficiency.

关键词： wave crest amplitude freak waves short crested sea transformed linear simulation

Brockett’s First Example: An FAS Approach Treatment

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Journal of Systems Science & Complexity 2022年第2期35卷 441-456页

In this note,the well-known Brockett’s first example system is treated with the fully actuated system(FAS)***,it is shown that the system can be exponentially substabilized by a smooth controller in the sense that,except those starting from initial values on the z0-axis of the initial value space,all trajectories of the designed system as well as the control signals decay to zero ***,global stabilization is realized through a way of enabling the trajectories starting from initial values on the z0-axis also to go to the *** idea is to firstly move an initial point on the z0-axis away from the axis using a pre-controller,and then to take over by the designed exponentially sub-stabilizing controller.

关键词： Exponential sub-stabilization feedback stabilization fully actuated system approach region of attraction singularity sets

Predicting Loads and Dynamic Responses of An Offshore Jacket Wind Turbine in A Nonlinear Sea

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China Ocean Engineering 2020年第5期34卷 641-650页

作者： WANG Ying-guang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In order to improve the simulation efficiency, a novel transformed linear Gaussian model has been first proposed in this paper for generating equivalent "nonlinear" irregular waves. It is demonstrated by calculation examples that for obtaining equivalent "nonlinear" waves with the same accuracy, the transformed linear Gaussian model is about 2.7 times faster than the traditional nonlinear simulation method and is about 2.14 times faster than the method proposed by Agarwal and Manuel(2011). The loads and dynamic responses calculation results regarding an offshore jacket wind turbine in this paper demonstrate that nonlinearly simulated irregular waves with bottom effects should be considered in order to design an un-conservative support structure for the offshore wind turbine. Furthermore, by studying the calculation results in this article we have found that the loads and dynamic responses of the offshore wind turbine when inputting transformed linearly simulated waves with bottom effects are almost identical to the corresponding values when inputting nonlinearly simulated waves with bottom effects. All these calculation results clearly demonstrate the superiority and effectiveness of using our novel transformed linear Gaussian model for predicting the wave loads and dynamic responses of an offshore wind turbine operating in a realistic nonlinear sea with bottom effects.

关键词： loads dynamic responses offshore wind turbine bottom effects nonlinear irregular sea

Molecular simulation study of the microstructures and properties of pyridinium ionic liquid[HPy][BF_(4)]mixed with acetonitrile

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原子与分子物理学报 2025年第4期42卷 27-32页

作者： XU Jian-Qiang MA Zhao-Peng CHENG Si LIU Zhi-Cong ZHU guang-Lai Department of Physics School of Physics and Electronic InformationAnhui Normal UniversityWuhu 241002China

The microstructures and thermodynamic properties of mixed systems comprising pyridinium ionic liquid[HPy][BF_(4)]and acetonitrile at different mole fractions were studied using molecular dynamics simulation in this *** following properties were determined:density,self-diffusion coefficient,excess molar volume,and radial distribution *** results show that with an increase in the mole fraction of[HPy][BF_(4)],the self-diffusion coefficient ***,the excess molar volume initially decreases,reaches a minimum,and then *** rules of radial distribution functions(RDFs)of characteristic atoms are *** increasing the mole fraction of[HPy][BF_(4)],the first peak of the RDFs of HA1-F decreases,while that of CT6-CT6 rises at first and then *** indicates that the solvent molecules affect the polar and non-polar regions of[HPy][BF_(4)]differently.

关键词： Pyridinium ionic liquids Thermodynamic properties Molecular dynamics simulation Radial distribution functions

Multi-dimensional Backward Stochastic Differential Equations of Diagonally Quadratic Generators with a Special Structure

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Chinese Annals of Mathematics,Series B 2024年第6期45卷 855-868页

作者： guang YANG Shanghai Center for Mathematical Sciences Fudan University

The present paper is devoted to the well-posedness of a type of multi-dimensional backward stochastic differential equations（BSDE for short） with a diagonally quadratic generator. The author gives a new priori estimate, and prove that the BSDE admits a unique solution on a given interval when the generator has a sufficiently small growth of the off-diagonal elements（i.e., for each i, the i-th component of the generator has a small growth of the j-th row zjof the variable z for each j ≠ i）. Finally, a solvability result is given when the diagonally quadratic generator is triangular.

关键词： 60H10 BMO martingale Diagonally quadratic generator Multi-dimensional BSDE