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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

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

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

Predicting Nonlinear Wave Trough Distributions Utilizing A Transformed Linear Simulation Method

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China Ocean Engineering 2018年第6期32卷 655-664页

作者： wang Ying-guang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai 200240China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

This paper first proposes a new approach for predicting the nonlinear wave trough distributions by utilizing a transformed linear simulation method. The linear simulation method is transformed based on a Hermite transformation model where the transformation is chosen to be a monotonic cubic polynomial and calibrated such that the first four moments of the transformed model match the moments of the true process. The proposed new approach is applied for calculating the wave trough distributions of a nonlinear sea state with the surface elevation data measured at the coast of Yura in the Japan Sea, and its accuracy and efficiency are convincingly validated by comparisons with the results from two theoretical distribution models, from a linear simulation model and a secondorder nonlinear simulation model. Finally, it is further demonstrated in this paper that the new approach can be applied to all the situations characterized by similar nondimensional spectrum.

关键词： nonlinear wave troughs transformed linear simulation Hermite transformation nonlinear simulation

Prediction of Height and Period Joint Distributions for Stochastic Ocean Waves

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China Ocean Engineering 2017年第3期31卷 291-298页

作者： wang Ying-guang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE) Shanghai 200240 China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

This article proposes a new methodology to predict the wave height and period joint distributions by utilizing a transformed linear simulation method. The proposed transformed linear simulation method is based on a Hermite transformation model where the transformation is chosen to be a monotonic cubic polynomial, calibrated such that the first four moments of the transformed model match the moments of the true process. The proposed new approach is applied for calculating the wave height and period joint distributions of a sea state with the surface elevation data measured at an offshore site, and its accuracy and efficiency are favorably validated by using comparisons with the results from an empirical joint distribution model, from a linear simulation model and from a second-order nonlinear simulation model.

关键词： wave height and period transformed linear simulation Hermite transformation linear simulation nonlinearsimulation

Asymptotic Calculation of the Wave Trough Exceedance Probabilities in A Nonlinear Sea

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China Ocean Engineering 2018年第2期32卷 189-195页

This paper concerns the calculation of the wave trough exceedance probabilities in a nonlinear sea. The calculations have been carried out by incorporating a second order nonlinear wave model into an asymptotic method. This is a new approach for the calculation of the wave trough exceedance probabilities, and, as all of the calculations are performed in the probability domain, avoids the need for long time-domain simulations. The proposed asymptotic method has been applied to calculate the wave trough depth exceedance probabilities of a sea state with the surface elevation data measured at the coast of Yura in the Japan Sea. It is demonstrated that the proposed new method can offer better predictions than the theoretical Rayleigh wave trough depth distribution model. The calculated results by using the proposed new method have been further compared with those obtained by using the Arhan and Plaisted nonlinear distribution model and the Toffoli et al.’s wave trough depth distribution model, and its accuracy has been once again substantiated. The research findings obtained from this study demonstrate that the proposed asymptotic method can be readily utilized in the process of designing various kinds of ocean engineering structures.

关键词： wave trough depth second order nonlinear wave model asymptotic method measured data

Estimation of Wave Crest Amplitudes Distribution and Freak Wave Occurrence in A Short Crested Mixed Sea

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China Ocean Engineering 2019年第4期33卷 484-492页

作者： wang Ying-guang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University

In this study we have for the first time proposed a novel transformed linear simulation method for the estimation of wave crest amplitudes distribution and freak wave occurrence in a short crested mixed sea with a bimodal 3D spectrum. For implementing the proposed transformed linear simulation method, a Hermite transformation model expressed in a monotonic cubic polynomial has been constructed so that the first four moments of the original true process match the corresponding moments of the transformed model. The proposed novel simulation method has been applied to forecast the freak wave occurrence in two short crested mixed sea states, one with a directional wave spectrum based on the measured surface elevation data at the coast of Yura, and the other one with a typical directional bimodal Torsethaugen wave spectrum. It is shown in the two cases that the proposed novel simulation method can offer more accurate forecasting results than those obtained from the traditional linear simulation method or by using Rayleigh distribution model. It is also demonstrated in this article that the proposed novel simulation method is more efficient than the nonlinear simulation method.

关键词： freak waves short crested mixed sea transformed linear simulation Rayleigh distribution model

A Note on the Perturbations of Compact Quantum Metric Spaces

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Acta Mathematica Sinica,English Series 2016年第10期32卷 1214-1220页

作者： Li guang wang School of Mathematical Sciences Qufu Normal University

In this short note, we consider the perturbation of compact quantum metric spaces. We first show that for two compact quantum metric spaces （A, P） and （B, Q） for which A and B are subspaces of an order-unit space t and P and Q are Lip-norms on A and B respectively, the quantum Gromov-Hausdorff distance between （A, P） and （B, Q） is small under certain conditions. Then some other perturbation results on compact quantum metric spaces derived from spectral triples are also given.

关键词： Compact quantum metric space quantum Gromov-Hausdorff distance C*-algebra Lip-norm spectral triple

On Maximal Abelian Self-adjoint Subalgebras of Factors of Type II_1

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Acta Mathematica Sinica,English Series 2005年第3期21卷 569-576页

作者： Li guang wang Institute of Mathematics Chinese Academy of Sciences Beijing 100080 P. R. China Department of Mathematics Qufu Normal University Qufu 273165 P. R. China

In this note, we show that if N is a proper subfactor of a factor M of type Ⅱ1 with finite Jones index, then there is a maximal abelian self-adjoint subalgebra （masa） A of N that is not a masa in ,M. Popa showed that there is a proper subfactor R0 of the hyperfinite type Ⅱ1 factor R such that each masa in R0 is also a masa in R. We shall give a detailed proof of Popa＇s result.

关键词： Maximal abelian self-adjoint subalgebra Index Von Neumann algebra Factor,Conditional expectation