目的探究MR 3D CUBE与常规磁共振成像(MRI)在膝关节前交叉韧带损伤中的应用价值。方法选取2022年1月至2024年4月本院收治的136例膝关节前交叉韧带损伤患者,根据患者损伤程度分为Ⅰ级、Ⅱ级和Ⅲ级;患者均进行MR 3D CUBE与常规MRI检查;Ka...目的探究MR 3D CUBE与常规磁共振成像(MRI)在膝关节前交叉韧带损伤中的应用价值。方法选取2022年1月至2024年4月本院收治的136例膝关节前交叉韧带损伤患者,根据患者损伤程度分为Ⅰ级、Ⅱ级和Ⅲ级;患者均进行MR 3D CUBE与常规MRI检查;Kappa检验分析MR 3D CUBE、常规MRI与关节镜诊断的一致性;以关节镜检查结果为金标准,采用四格表分析MR 3D CUBE与常规MRI对膝关节前交叉韧带不同损伤分级的诊断价值;膝关节前交叉韧带损伤治疗效果的影响因素采用Logistic回归分析。结果MR 3D CUBE、常规MRI与关节镜诊断的一致性较好(Kappa=0.664、0.832,P<0.05)。MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为91.91%,Ⅱ级时准确度为91.18%,Ⅲ级时准确度为94.85%;常规MRI在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为85.29%,Ⅱ级时准确度为83.09%,Ⅲ级时准确度为87.50%,MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅲ级时准确度显著高于常规MRI(P<0.05)。不良组和良好组病程和既往损伤比较有差异(P<0.05)。多因素Logistic回归分析得知,病程和既往损伤是影响膝关节前交叉韧带损伤患者治疗效果的危险因素(P<0.05)。结论MR 3D CUBE与常规MRI均能诊断膝关节前交叉韧带损伤,但MR 3D CUBE诊断效能高于常规MRI,可在临床应用。展开更多
This study seeks to establish a novel,semi-automatic system that utilizes Industry 4.0 principles to effectively determine both acceptable and rejectable concrete cubes with regard to their failure modes,significantly...This study seeks to establish a novel,semi-automatic system that utilizes Industry 4.0 principles to effectively determine both acceptable and rejectable concrete cubes with regard to their failure modes,significantly contributing to the dependability of concrete quality evaluations.The study utilizes image processing and machine learning(ML)methods,namely object detectionmodels such as YOLOv8 and Convolutional Neural Networks(CNNs),to evaluate images of concrete cubes.These models are trained and validated on an extensive database of annotated images from real-world and laboratory conditions.Preliminary results indicate a good performance in the classification of concrete cube failure modes.The proposed system accurately identifies cracks,determines the severity of damage to structures,indicating the potential to minimize human errors and discrepancies that might occur through the current techniques to detect the failure mode of concrete cubes.Thedeveloped systemcould significantly improve the reliability of concrete cube assessments,reduce resource wastage,and contribute to more sustainable construction practices.By minimizing material costs and errors,this innovation supports the construction industry’s move towards sustainability.展开更多
The topic of improving the mechanical stability of external cavity diode lasers(ECDLs)has recently attracted widespread attention and interest.The use of corner-cube-array(CCA)-based resonators provides a potential so...The topic of improving the mechanical stability of external cavity diode lasers(ECDLs)has recently attracted widespread attention and interest.The use of corner-cube-array(CCA)-based resonators provides a potential solution for this purpose,although continuous oscillation at super large incident angle remains challenging.In this work,we employ the CCA resonator to generate continuous oscillation within±20°angular misalignment of cavity mirror in experiment.On the basis of retroreflection theory,the retroreflectivity of a CCA is analyzed by using optical simulation software.Notably,the experiment verifies the advantage of using a CCA over a plane mirror in laser resonator,thereby providing a promising approach for ECDLs.The threshold characteristic curves measured at different incident angles in the experiment verify that the CCA possesses an obvious anti-angle misalignment performance.This research introduces an alternative solution of using CCA resonator instead of parallel plane cavity,thereby realizing an adjustment-free ECDL with enhanced mechanical stability.展开更多
The method for optimizing the hydraulic fracturing parameters of the cube development infill well pad was proposed,aiming at the well pattern characteristic of“multi-layer and multi-period”of the infill wells in Sic...The method for optimizing the hydraulic fracturing parameters of the cube development infill well pad was proposed,aiming at the well pattern characteristic of“multi-layer and multi-period”of the infill wells in Sichuan Basin.The fracture propagation and inter-well interference model were established based on the evolution of 4D in-situ stress,and the evolution characteristics of stress and the mechanism of interference between wells were analyzed.The research shows that the increase in horizontal stress difference and the existence of natural fractures/faults are the main reasons for inter-well interference.Inter-well interference is likely to occur near the fracture zones and between the infill wells and parent wells that have been in production for a long time.When communication channels are formed between the infill wells and parent wells,it can increase the productivity of parent wells in the short term.However,it will have a delayed negative impact on the long-term sustained production of both infill wells and parent wells.The change trend of in-situ stress caused by parent well production is basically consistent with the decline trend of pore pressure.The lateral disturbance range of in-situ stress is initially the same as the fracture length and reaches 1.5 to 1.6 times that length after 2.5 years.The key to avoiding inter-well interference is to optimize the fracturing parameters.By adopting the M-shaped well pattern,the optimal well spacing for the infill wells is 300 m,the cluster spacing is 10 m,and the liquid volume per stage is 1800 m^(3).展开更多
Fault diagnosis in multiprocessor systems is critical for ensuring system reliability.The exchanged crossed cube(ECQ(s,t)),which combines the advantages of the exchanged cube and the crossed cube,offers a high perform...Fault diagnosis in multiprocessor systems is critical for ensuring system reliability.The exchanged crossed cube(ECQ(s,t)),which combines the advantages of the exchanged cube and the crossed cube,offers a high performance-to-cost ratio but lacks comprehensive analysis in terms of fault tolerance.This paper investigates the 1-good-neighbor diagnosability of the ECQ(s,t),assuming that each fault-free node has at least one fault-free neighbor.We rigorously prove that the 1-good-neighbor diagnosability of The ECQ(s,t)under the Preparata,Metze,and Chien(PMC)model and Maeng and Malek(MM)model is t_(1)=2s+1(for t≥s≥4)and t_(1)=2s+1(for t≥s≥5),respectively.Furthermore,we design an efficient diagnostic algorithm based on the 1-good-neighbor criterion.Simulation results demonstrate the algorithm’s effectiveness,exhibiting lower time complexity and improved performance in faulty node identification.These results offer theoretical insights and practical tools for enhancing the fault diagnosis capabilities of ECQ(s,t).展开更多
The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Cente...The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Center (Chaoyang Pavilion) on March 20th.More than 900 exhibitors built an aesthetic corridor of quality life with 200,000 gifts.展开更多
在数据仓库系统中,数据立方体(Cube)及其预聚集处理在OLAP起到非常重要的作用.对于一个d维的data Cube可以生成2d个聚集Cuboids和multiply from i=1 to d(|Di|+1)个聚集数据单元,但对于一个高维Cube,要创建这些所有聚集Cuboids是不现实...在数据仓库系统中,数据立方体(Cube)及其预聚集处理在OLAP起到非常重要的作用.对于一个d维的data Cube可以生成2d个聚集Cuboids和multiply from i=1 to d(|Di|+1)个聚集数据单元,但对于一个高维Cube,要创建这些所有聚集Cuboids是不现实的.提出通过共享分段立方体Mini-Cube的高维Cube并行分布式存储结构(DHMC),将高维Cube划分成若干个低维共享分段立方体Mini-Cube,利用并行分布式处理技术来创建这些分割的分段共享Mini-Cube及其聚集Cuboids,来实现高维Cube的并行创建和增量更新维护,从而解决高维OLAP聚集海量数据的存储与查询问题.理论分析与实验结果均表明DHMC性能最佳.展开更多
阐述了一种基于表面生成的多波束数据处理方法——CUBE(Combined Uncertainty and Bathymetry Estimator)算法,用该方法可以对观测区域网格节点"真实"水深及相关误差进行估计。与从测量水深中选择出"最佳"数据的手...阐述了一种基于表面生成的多波束数据处理方法——CUBE(Combined Uncertainty and Bathymetry Estimator)算法,用该方法可以对观测区域网格节点"真实"水深及相关误差进行估计。与从测量水深中选择出"最佳"数据的手工交互方式的多波束数据编辑手段不同,CUBE算法具有很强的抗差性和较高的效率,适合于实时多波束数据处理。对南海某测区多波束数据处理结果表明,在没有人工干预的情况下,利用CUBE算法去噪生成的海底DTM图与手工编辑生成的相当吻合。CUBE算法和手工编辑方法综合对比得出,CUBE算法能够很好地保留水深地形细节,在计算效率、误差评估、实时处理等方面比手工编辑方法具有较大的优势。展开更多
文摘目的探究MR 3D CUBE与常规磁共振成像(MRI)在膝关节前交叉韧带损伤中的应用价值。方法选取2022年1月至2024年4月本院收治的136例膝关节前交叉韧带损伤患者,根据患者损伤程度分为Ⅰ级、Ⅱ级和Ⅲ级;患者均进行MR 3D CUBE与常规MRI检查;Kappa检验分析MR 3D CUBE、常规MRI与关节镜诊断的一致性;以关节镜检查结果为金标准,采用四格表分析MR 3D CUBE与常规MRI对膝关节前交叉韧带不同损伤分级的诊断价值;膝关节前交叉韧带损伤治疗效果的影响因素采用Logistic回归分析。结果MR 3D CUBE、常规MRI与关节镜诊断的一致性较好(Kappa=0.664、0.832,P<0.05)。MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为91.91%,Ⅱ级时准确度为91.18%,Ⅲ级时准确度为94.85%;常规MRI在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为85.29%,Ⅱ级时准确度为83.09%,Ⅲ级时准确度为87.50%,MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅲ级时准确度显著高于常规MRI(P<0.05)。不良组和良好组病程和既往损伤比较有差异(P<0.05)。多因素Logistic回归分析得知,病程和既往损伤是影响膝关节前交叉韧带损伤患者治疗效果的危险因素(P<0.05)。结论MR 3D CUBE与常规MRI均能诊断膝关节前交叉韧带损伤,但MR 3D CUBE诊断效能高于常规MRI,可在临床应用。
文摘This study seeks to establish a novel,semi-automatic system that utilizes Industry 4.0 principles to effectively determine both acceptable and rejectable concrete cubes with regard to their failure modes,significantly contributing to the dependability of concrete quality evaluations.The study utilizes image processing and machine learning(ML)methods,namely object detectionmodels such as YOLOv8 and Convolutional Neural Networks(CNNs),to evaluate images of concrete cubes.These models are trained and validated on an extensive database of annotated images from real-world and laboratory conditions.Preliminary results indicate a good performance in the classification of concrete cube failure modes.The proposed system accurately identifies cracks,determines the severity of damage to structures,indicating the potential to minimize human errors and discrepancies that might occur through the current techniques to detect the failure mode of concrete cubes.Thedeveloped systemcould significantly improve the reliability of concrete cube assessments,reduce resource wastage,and contribute to more sustainable construction practices.By minimizing material costs and errors,this innovation supports the construction industry’s move towards sustainability.
基金supported by the Natural Science Foundation of Jiangsu Province(Grant No.BK20240613)Jiangsu Province’s“Innovation and Entrepreneurship Doctor”Program(Grant No.JSSCBS20230088)+4 种基金Natural Science Foundation of Nanjing University of Posts and Telecommunications(Grant No.NY224123)Natural Science Research Start-up Foundation of Recruiting Talents of Nanjing University of Posts and Telecommunications(Grant No.NY222112)Beijing Nova Program(Grant No.20240484696)Wenzhou Major Science and Technology Innovation Key Project(Grant No.ZG2020046)INNOVATION Program for Quantum Science and Technology(Grant No.2021ZD0303200)。
文摘The topic of improving the mechanical stability of external cavity diode lasers(ECDLs)has recently attracted widespread attention and interest.The use of corner-cube-array(CCA)-based resonators provides a potential solution for this purpose,although continuous oscillation at super large incident angle remains challenging.In this work,we employ the CCA resonator to generate continuous oscillation within±20°angular misalignment of cavity mirror in experiment.On the basis of retroreflection theory,the retroreflectivity of a CCA is analyzed by using optical simulation software.Notably,the experiment verifies the advantage of using a CCA over a plane mirror in laser resonator,thereby providing a promising approach for ECDLs.The threshold characteristic curves measured at different incident angles in the experiment verify that the CCA possesses an obvious anti-angle misalignment performance.This research introduces an alternative solution of using CCA resonator instead of parallel plane cavity,thereby realizing an adjustment-free ECDL with enhanced mechanical stability.
基金Supported by the General Program of the NATIONAL NATURAL SCIENCE FOUNDATION OF CHINA(52374004)National Key Research and Development Program(2023YFF06141022023YFE0110900)。
文摘The method for optimizing the hydraulic fracturing parameters of the cube development infill well pad was proposed,aiming at the well pattern characteristic of“multi-layer and multi-period”of the infill wells in Sichuan Basin.The fracture propagation and inter-well interference model were established based on the evolution of 4D in-situ stress,and the evolution characteristics of stress and the mechanism of interference between wells were analyzed.The research shows that the increase in horizontal stress difference and the existence of natural fractures/faults are the main reasons for inter-well interference.Inter-well interference is likely to occur near the fracture zones and between the infill wells and parent wells that have been in production for a long time.When communication channels are formed between the infill wells and parent wells,it can increase the productivity of parent wells in the short term.However,it will have a delayed negative impact on the long-term sustained production of both infill wells and parent wells.The change trend of in-situ stress caused by parent well production is basically consistent with the decline trend of pore pressure.The lateral disturbance range of in-situ stress is initially the same as the fracture length and reaches 1.5 to 1.6 times that length after 2.5 years.The key to avoiding inter-well interference is to optimize the fracturing parameters.By adopting the M-shaped well pattern,the optimal well spacing for the infill wells is 300 m,the cluster spacing is 10 m,and the liquid volume per stage is 1800 m^(3).
基金Supported by Guangxi Natural Science Foundation(No.2025GXNSFAA069414)Guangxi Key R&D Project(No.Gui Ke AB24010049).
文摘Fault diagnosis in multiprocessor systems is critical for ensuring system reliability.The exchanged crossed cube(ECQ(s,t)),which combines the advantages of the exchanged cube and the crossed cube,offers a high performance-to-cost ratio but lacks comprehensive analysis in terms of fault tolerance.This paper investigates the 1-good-neighbor diagnosability of the ECQ(s,t),assuming that each fault-free node has at least one fault-free neighbor.We rigorously prove that the 1-good-neighbor diagnosability of The ECQ(s,t)under the Preparata,Metze,and Chien(PMC)model and Maeng and Malek(MM)model is t_(1)=2s+1(for t≥s≥4)and t_(1)=2s+1(for t≥s≥5),respectively.Furthermore,we design an efficient diagnostic algorithm based on the 1-good-neighbor criterion.Simulation results demonstrate the algorithm’s effectiveness,exhibiting lower time complexity and improved performance in faulty node identification.These results offer theoretical insights and practical tools for enhancing the fault diagnosis capabilities of ECQ(s,t).
文摘The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Center (Chaoyang Pavilion) on March 20th.More than 900 exhibitors built an aesthetic corridor of quality life with 200,000 gifts.
文摘在数据仓库系统中,数据立方体(Cube)及其预聚集处理在OLAP起到非常重要的作用.对于一个d维的data Cube可以生成2d个聚集Cuboids和multiply from i=1 to d(|Di|+1)个聚集数据单元,但对于一个高维Cube,要创建这些所有聚集Cuboids是不现实的.提出通过共享分段立方体Mini-Cube的高维Cube并行分布式存储结构(DHMC),将高维Cube划分成若干个低维共享分段立方体Mini-Cube,利用并行分布式处理技术来创建这些分割的分段共享Mini-Cube及其聚集Cuboids,来实现高维Cube的并行创建和增量更新维护,从而解决高维OLAP聚集海量数据的存储与查询问题.理论分析与实验结果均表明DHMC性能最佳.
文摘阐述了一种基于表面生成的多波束数据处理方法——CUBE(Combined Uncertainty and Bathymetry Estimator)算法,用该方法可以对观测区域网格节点"真实"水深及相关误差进行估计。与从测量水深中选择出"最佳"数据的手工交互方式的多波束数据编辑手段不同,CUBE算法具有很强的抗差性和较高的效率,适合于实时多波束数据处理。对南海某测区多波束数据处理结果表明,在没有人工干预的情况下,利用CUBE算法去噪生成的海底DTM图与手工编辑生成的相当吻合。CUBE算法和手工编辑方法综合对比得出,CUBE算法能够很好地保留水深地形细节,在计算效率、误差评估、实时处理等方面比手工编辑方法具有较大的优势。
