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Forward modeling of ocean-bottom cable data and wave-mode separation in fluid–solid elastic media with irregular seabed 认领 引用 被引量：4
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作者 Qu Ying-Ming Sun Jun-Zhi +3 位作者 Li Zhen-Chun Huang Jian-Ping Li Hai-Peng Sun Wen-Zhi 《Applied Geophysics》 SCIE CSCD 2018年第3期432-447,共16页
In marine seismic exploration, ocean-bottom cable techniques accurately record the multicomponent seismic wavefield; however, the seismic wave propagation in fluid–solid media cannot be simulated by a single wave equ... In marine seismic exploration, ocean-bottom cable techniques accurately record the multicomponent seismic wavefield; however, the seismic wave propagation in fluid–solid media cannot be simulated by a single wave equation. In addition, when the seabed interface is irregular, traditional finite-difference schemes cannot simulate the seismic wave propagation across the irregular seabed interface. Therefore, an acoustic–elastic forward modeling and vector-based P-and S-wave separation method is proposed. In this method, we divide the fluid–solid elastic media with irregular interface into orthogonal grids and map the irregular interface in the Cartesian coordinates system into a horizontal interface in the curvilinear coordinates system of the computational domain using coordinates transformation. The acoustic and elastic wave equations in the curvilinear coordinates system are applied to the fluid and solid medium, respectively. At the irregular interface, the two equations are combined into an acoustic–elastic equation in the curvilinear coordinates system. We next introduce a full staggered-grid scheme to improve the stability of the numerical simulation. Thus, separate P-and S-wave equations in the curvilinear coordinates system are derived to realize the P-and S-wave separation method. 展开更多
关键词 Irregular seabed fluid-solid elastic media ocean bottom cable data P-and S-wave separation curvilinear coordinates
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Separation method for multi-source blended seismic data 认领 引用 被引量：4
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作者 王汉闯 陈生昌 +1 位作者 张博 佘德平 《Applied Geophysics》 SCIE CSCD 2013年第3期251-264,357,共14页
Multi-source seismic technology is an efficient seismic acquisition method that requires a group of blended seismic data to be separated into single-source seismic data for subsequent processing. The separation of ble... Multi-source seismic technology is an efficient seismic acquisition method that requires a group of blended seismic data to be separated into single-source seismic data for subsequent processing. The separation of blended seismic data is a linear inverse problem. According to the relationship between the shooting number and the simultaneous source number of the acquisition system, this separation of blended seismic data is divided into an easily determined or overdetermined linear inverse problem and an underdetermined linear inverse problem that is difficult to solve. For the latter, this paper presents an optimization method that imposes the sparsity constraint on wavefields to construct the object function of inversion, and the problem is solved by using the iterative thresholding method. For the most extremely underdetermined separation problem with single-shooting and multiple sources, this paper presents a method of pseudo-deblending with random noise filtering. In this method, approximate common shot gathers are received through the pseudo-deblending process, and the random noises that appear when the approximate common shot gathers are sorted into common receiver gathers are eliminated through filtering methods. The separation methods proposed in this paper are applied to three types of numerical simulation data, including pure data without noise, data with random noise, and data with linear regular noise to obtain satisfactory results. The noise suppression effects of these methods are sufficient, particularly with single-shooting blended seismic data, which verifies the effectiveness of the proposed methods. 展开更多
关键词 Multi-source data separation linear inverse problem sparsest constraint pseudo-deblending filtering
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Compressed data separation via dual frames based split-analysis with Weibull matrices 认领 引用 被引量：2
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作者 CAI Yun LI Song 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2013年第4期427-437,共11页
In this paper, we consider data separation problem, where the original signal is composed of two distinct subcomponents, via dual frames based Split-analysis approach. We show that the two distinct subcomponents, whic... In this paper, we consider data separation problem, where the original signal is composed of two distinct subcomponents, via dual frames based Split-analysis approach. We show that the two distinct subcomponents, which are sparse in two diff erent general frames respectively, can be exactly recovered with high probability, when the measurement matrix is a Weibull random matrix （not Gaussian） and the two frames satisfy a mutual coherence property. Our result may be significant for analysing Split-analysis model for data separation. 展开更多
关键词 Compressed sensing data separation dual frames split-analysis Weibull random matrices
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Separation of P. and SV-wavefields from multi-componen seismic data 认领 引用 被引量：1
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作者 刘道理 胡天跃 王彦宾 《Applied Geophysics》 2006年第3期163-168,共6页
In multi-component seismic exploration, the horizontal and vertical components both contain P- and SV-waves. The P- and SV-wavefields in a seismic record can be separated by their horizontal and vertical displacements... In multi-component seismic exploration, the horizontal and vertical components both contain P- and SV-waves. The P- and SV-wavefields in a seismic record can be separated by their horizontal and vertical displacements when upgoing P- and SV-waves arrive at the sea floor. If the sea floor P wave velocity, S wave velocity, and density are known, the separation can be achieved in ther-p domain. The separated wavefields are then transformed to the time domain. A method of separating P- and SV-wavefields is presented in this paper and used to effectively separate P- and SV-wavefields in synthetic and real data. The application to real data shows that this method is feasible and effective. It also can be used for free surface data. 展开更多
关键词 multi-component seismic data wavefield separation P-SV wave r-p transform.
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The Legal Structure of Structural Separation of Data Property Rights:Chinese Theory of Data Property Rights 认领 引用 被引量：2
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作者 CHEN Runkai 《US-China Law Review》 2023年第7期315-321,共7页
The data property rights system is based on the rise of data as a production factor.The construction of a data property rights system needs to conform to the characteristics of data and the way in which the value of d... The data property rights system is based on the rise of data as a production factor.The construction of a data property rights system needs to conform to the characteristics of data and the way in which the value of data elements is realized,with the goal of promoting the compliant and efficient circulation and use of data,and empowering the real economy.The construction of data property rights also needs to handle the relationship between data processors and data sources,clarify the different levels of data property interests and other information interests,and adopt different adjustment measures accordingly.The data property rights system should,on this basis,confirm and protect the interests of data resource holders,clarify the permissions and legal boundaries of data processing behaviors such as processing and use,and construct a diversified revenue mechanism for data products. 展开更多
关键词 data property rights structural separation data elements data rights
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Separation of up-going and down-going wave fields of vertical cable data 认领 引用 被引量：1
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作者 ChuanwenSun JohnStratton +1 位作者 JohnAnderson PhilipRabinowitz 《Chinese Journal of Oceanology and Limnology》 2005年第3期259-268,共10页
The vertical cable method for acquiring and processing pre-stack 3-D marine seismic data is based on the technology developed by the US Navy for antisubmarine warfare. In order to achieve the maximum utili- zation of ... The vertical cable method for acquiring and processing pre-stack 3-D marine seismic data is based on the technology developed by the US Navy for antisubmarine warfare. In order to achieve the maximum utili- zation of vertical cable field data, a new separation method of the up-going and down-going wave fields of the vertical cable data processing was developed in this paper, which is different from the separation of the down-going and up-going wave fields of normal VSP data processing. In tests with synthetic modeling data and actual field data, this newly developed method performs well and is also computationally simpler without pre-assumption conditions. 展开更多
关键词 separation up-going wave field down-going wave field vertical cable data
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Cyclomatic Complexity-Based Encapsulation, Data Hiding, and Separation of Concerns 认领 引用
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作者 Charles W. Butler Thomas J. McCabe 《Journal of Software Engineering and Applications》 2021年第1期44-66,共23页
Three design principles are prominent in software development-encapsulation, data hiding, and separation of concerns. These principles are used as subjective quality criteria for both procedural and object-oriented ap... Three design principles are prominent in software development-encapsulation, data hiding, and separation of concerns. These principles are used as subjective quality criteria for both procedural and object-oriented applications. The purpose of research is to quantify encapsulation, data hiding, and separation of concerns is quantified using cyclomatic-based metrics. As a result of this research, the derived design metrics, coefficient of encapsulation, coefficient of data hiding, and coefficient of separation of concerns, are defined and applied to production software indicating whether the software has low or high encapsulation, data hiding, and separation of concerns. 展开更多
关键词 Object-Oriented Design Methods Reliability Complexity Measures Software Design Encapsulation Information Hiding Separation of Concerns McCabe Metrics Coefficient of Encapsulation Coefficient of Data Hiding Coefficient of Separation of Concerns
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Development and prospect of downhole monitoring and data transmission technology for separated zone water injection 认领 引用 被引量：9
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作者 LIU He ZHENG Lichen +4 位作者 YU Jiaqing MING Eryang YANG Qinghai JIA Deli CAO Gang 《Petroleum Exploration and Development》 SCIE 2023年第1期191-201,共11页
This article outlines the development of downhole monitoring and data transmission technology for separated zone water injection in China.According to the development stages,the principles,operation processes,adaptabi... This article outlines the development of downhole monitoring and data transmission technology for separated zone water injection in China.According to the development stages,the principles,operation processes,adaptability and application status of traditional downhole data acquisition method,cable communications and testing technology,cable-controlled downhole parameter real-time monitoring communication method and downhole wireless communication technology are introduced in detail.Problems and challenges of existing technologies in downhole monitoring and data transmission technology are pointed out.According to the production requirement,the future development direction of the downhole monitoring and data transmission technology for separated zone water injection is proposed.For the large number of wells adopting cable measuring and adjustment technology,the key is to realize the digitalization of downhole plug.For the key monitoring wells,cable-controlled communication technology needs to be improved,and downhole monitoring and data transmission technology based on composite coiled tubing needs to be developed to make the operation more convenient and reliable.For large-scale application in oil fields,downhole wireless communication technology should be developed to realize automation of measurement and adjustment.In line with ground mobile communication network,a digital communication network covering the control center,water distribution station and oil reservoir should be built quickly to provide technical support for the digitization of reservoir development. 展开更多
关键词 separated zone water injection downhole monitoring data transmission cable communication vibration wave pressure wave flow wave
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Magnetotelluric signal-noise separation method based on SVM–CEEMDWT 认领 引用 被引量：3
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作者 Li Jin Cai Jin +3 位作者 Tang Jing-Tian Li Guang Zhang Xian Xu Zhi-Min 《Applied Geophysics》 SCIE CSCD 2019年第2期160-170,252-253,共11页
To better retain useful weak low-frequency magnetotelluric(MT)signals with strong interference during MT data processing,we propose a SVM-CEEMDWT based MT data signal-noise separation method,which extracts the weak MT... To better retain useful weak low-frequency magnetotelluric(MT)signals with strong interference during MT data processing,we propose a SVM-CEEMDWT based MT data signal-noise separation method,which extracts the weak MT signal affected by strong interference.First,the approximate entropy,fuzzy entropy,sample entropy,and Lempel-Ziv(LZ)complexity are extracted from the magnetotelluric data.Then,four robust parameters are used as the inputs to the support vector machine(SVM)to train the sample library and build a model based on the different complexity of signals.Based on this model,we can only consider time series with strong interference when using the complementary ensemble empirical mode decomposition(CEEMD)and wavelet threshold(WT)for noise suppression.Simulation results suggest that the SVM based on the robust parameters can distinguish the time periods with strong interference well before noise suppression.Compared with the CEEMD WT,the proposed SVM-CEEMDWT method retains more low-frequency low-variability information,and the apparent resistivity curve is smoother and more continuous.Moreover,the results better reflect the deep electrical structure in the field. 展开更多
关键词 SVM-CEEMDWT magnetotelluric signal-noise separation MT data processing
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Research on data assimilation strategy of turbulent separated flow over airfoil 认领 引用 被引量：5
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作者 Ying ZHANG Lin DU +1 位作者 Weiwei ZHANG Zichen DENG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2022年第4期571-586,共16页
In order to increase the accuracy of turbulence field reconstruction,this paper combines experimental observation and numerical simulation to develop and establish a data assimilation framework,and apply it to the stu... In order to increase the accuracy of turbulence field reconstruction,this paper combines experimental observation and numerical simulation to develop and establish a data assimilation framework,and apply it to the study of S809 low-speed and high-angle airfoil flow.The method is based on the ensemble transform Kalman filter(ETKF)algorithm,which improves the disturbance strategy of the ensemble members and enhances the richness of the initial members by screening high flow field sensitivity constants,increasing the constant disturbance dimensions and designing a fine disturbance interval.The results show that the pressure distribution on the airfoil surface after assimilation is closer to the experimental value than that of the standard Spalart-Allmaras(S-A)model.The separated vortex estimated by filtering is fuller,and the eddy viscosity field information is more abundant,which is physically consistent with the observation information.Therefore,the data assimilation method based on the improved ensemble strategy can more accurately and effectively describe complex turbulence phenomena. 展开更多
关键词 turbulence data assimilation ensemble disturbance strategy large angle of attack separation ensemble transform Kalman filter(ETKF)
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ETH-GQS: An estimation of geoid-to-quasigeoid separation over Ethiopia 认领 引用
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作者 Ephrem Y.Belay Walyeldeen Godah +1 位作者 Malgorzata Szelachowska Robert Tenzer 《Geodesy and Geodynamics》 EI CSCD 2022年第1期31-37,共7页
The determination of accurate orthometric or normal heights remains one of the main challenges for the geodetic community in Ethiopia.These heights are required for geodetic and geodynamic scientific research as well ... The determination of accurate orthometric or normal heights remains one of the main challenges for the geodetic community in Ethiopia.These heights are required for geodetic and geodynamic scientific research as well as for extensive engineering applications.The main objective of this study is to estimate the geoid-to-quasi geoid separation(GQS)in Ethiopia(ETH-GQS).Such separation would be required for the conversion between geoid and quasigeoid models,which is mandatory for the determination of accurate geodetic heights in mountain regions.The airborne free-air gravity anomalies and the topo-graphic information retrieved from the SRTM3(Shuttle Radar Topography Mission of a spatial resolution 3 arc-second)digital elevation model were used to compute the ETH-GQS model according to the Sjoberg's strict formula for the geoid-to-quasigeoid separation.The ETH-GQS was then validated using GNSS-levelling data as well as geoid heights determined from different Global Geopotential Models(GGMs),namely the EGM2008,EIGEN-6C4 and GECO.The results reveal that the standard deviation of differences between the geoid heights obtained from the EIGEN-6C4 model and the geometric geoid heights obtained from GNSS-levelling data were improved by~75%(i.e.from~24 to~6 cm)when considering GQS values obtained from the ETH-GQS. 展开更多
关键词 Geoid-to-quasigeoid separation GNSS-Levelling Ethiopian vertical control network Orthometric and normal heights Airborne gravity data
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Discriminant Analysis of the Linear Separable Data - Japanese 44 Cars 认领 引用
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作者 Shuichi Shinmura 《Journal of Statistical Science and Application》 2016年第4期165-178,共14页
There are four serious problems in the discriminant analysis. We developed an optimal linear discriminant function （optimal LDF） based on the minimum number of misclassification （minimum NM） using integer programm... There are four serious problems in the discriminant analysis. We developed an optimal linear discriminant function （optimal LDF） based on the minimum number of misclassification （minimum NM） using integer programming （IP）. We call this LDF as Revised IP-OLDF. Only this LDF can discriminate the cases on the discriminant hyperplane （Probleml）. This LDF and a hard-margin SVM （H-SVM） can discriminate the lineary separable data （LSD） exactly. Another LDFs may not discriminate the LSD theoretically （Problem2）. When Revised IP-OLDF discriminate the Swiss banknote data with six variables, we find MNM of two-variables model such as （X4, X6） is zero. Because MNMk decreases monotounusly （MNMk 〉= MNM（k＋1））, sixteen MNMs including （X4, X6） are zero. Until now, because there is no research of the LSD, we surveyed another three linear separable data sets such as： 18 exam scores data sets, the Japanese 44 cars data and six microarray datasets. When we discriminate the exam scores with MNM=0, we find the generalized inverse matrix technique causes the serious Problem3 and confirmed this fact by the cars data. At last, we claim the discriminant analysis is not the inferential statistics because there is no standard errors （SEs） of error rates and discriminant coefficients （Problem4）. Therefore, we poroposed the ＂100-fold cross validation for the small sample＂ method （the method）. By this break-through, we can choose the best model having minimum mean of error rate （M2） in the validation sample and obtaine two 95% confidence intervals （CIs） of error rate and discriminant coefficients. When we discriminate the exam scores by this new method, we obtaine the surprising results seven LDFs except for Fisher＇s LDF are almost the same as the trivial LDFs. In this research, we discriminate the Japanese 44 cars data because we can discuss four problems. There are six independent variables to discriminate 29 regular cars and 15 small cars. This data is linear separable by the emission rate （X1） and the number of seats （X3）. We examine the validity of the new model selection procedure of the discriminant analysis. We proposed the model with minimum mean of error rates （M2） in the validation samples is the best model. We had examined this procedure by the exam scores, and we obtain good results. Moreover, the 95% CI of eight LDFs offers us real perception of the discriminant theory. However, the exam scores are different from the ordinal data. Therefore, we apply our theory and procedure to the Japanese 44 cars data and confirmed the same conclution. 展开更多
关键词 Model Selection Procedure Means of Error Rates Fisher＇s LDF Logistic Regression Support VectorMachine （SVM） Minimum Number of Misclassifications （minimum NM MNM） Revised IP-OLDF based onMNM criterion Revised IPLP-OLDF Revised LP-OLDF Linear Separable Data and Model K-fold Crossvalidation.
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国家级大数据综合试验区建设对生态韧性的影响 认领 引用 被引量：1
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作者 韩高翔 马国勇 《生态学报》 CAS CSCD 北大核心 2026年第5期2252-2265,共14页
增强城市生态韧性对预防系统性生态风险和维护全局性生态安全意义重大。数据要素是城市绿色转型的重要驱动力,研究从理论上解构国家级大数据综合试验区建设对生态韧性影响的内在逻辑,基于地市层面的面板数据,依据“驱动-压力-状态-影响... 增强城市生态韧性对预防系统性生态风险和维护全局性生态安全意义重大。数据要素是城市绿色转型的重要驱动力,研究从理论上解构国家级大数据综合试验区建设对生态韧性影响的内在逻辑,基于地市层面的面板数据,依据“驱动-压力-状态-影响-响应”(DPSIR)框架采用熵权TOPSIS法测算城市生态韧性水平。根据国家级大数据综合试验区建设名单将样本划分为实验组和对照组,运用多期双重差分模型、中介效应模型和调节效应模型系统考察国家级大数据综合试验区建设对生态韧性的直接影响、作用机制及交互效应。研究发现:(1)基准回归结果表明,国家级大数据综合试验区建设能有效提升城市生态韧性水平,该结论经平行趋势检验、双重差分倾向得分匹配模型(PSM-DID)和安慰剂检验等一系列稳健性检验后依然成立。(2)异质性分析结果表明,国家级大数据综合试验区建设对城市生态韧性水平的提升作用在东西部地区、非资源型城市和环境保护重点城市中更为明显。(3)中介效应结果表明,国家级大数据综合试验区建设通过提高环境规制强度间接提升城市生态韧性水平。(4)调节效应结果表明,城乡分割大大削弱了国家级大数据综合试验区建设对生态韧性水平的提升效果。据此,从持续推进国家级大数据综合试验区建设完善、建立健全生态环境监督考核机制和缩小城乡“数字鸿沟”以打造城乡生态连续体三个方面提出政策建议,以期为推动数据要素赋能生态环境治理体系和治理能力现代化提供借鉴和参考。 展开更多
关键词 数据要素 国家级大数据综合试验区建设 生态韧性 环境规制 城乡分割
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非遗数据“权利分置”之理论证成与规范构建研究 认领 引用 被引量：4
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作者 聂鑫 《上海财经大学学报（哲学社会科学版）》 CSSCI 北大核心 2026年第2期124-137,共14页
伴随数据要素化与国家文化数字化战略的深入推进,非遗数据保护与利用间的固有矛盾日益凸显。传统知识产权数据保护范式因难以容纳非遗的集体性与活态性而面临局限;新兴的数据要素产权理论,虽为数据权属划分提供了新视角,却因其偏重经济... 伴随数据要素化与国家文化数字化战略的深入推进,非遗数据保护与利用间的固有矛盾日益凸显。传统知识产权数据保护范式因难以容纳非遗的集体性与活态性而面临局限;新兴的数据要素产权理论,虽为数据权属划分提供了新视角,却因其偏重经济效率的单一导向,无法独立支撑非遗数据所承载的文化尊严与伦理价值。通过对现有理论进行的反思与调适,尝试以“社区赋权”与“文化伦理”内化为核心法理基础,系统界定数据资源“代表权”、数据加工“许可权”以及数据产品“经营权”的归属与行使规则,建立起以“社区信托”为架构的“三权分置”体系,并嵌入事先知情同意与利益分享等文化伦理机制,为实现非遗数据治理中文化尊严维持与数据价值释放的有机平衡,提供系统性的制度方案。 展开更多
关键词 非物质文化遗产 数据要素 权利分置 社区赋权 社区信托
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竞争损失驱动的生成式不平衡节点分类 认领 引用
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作者 程凤伟 张槟淇 +1 位作者 徐国华 王文剑 《计算机应用》 CSCD 北大核心 2026年第5期1475-1481,共7页
图神经网络(GNN)在节点分类任务中取得了显著成功,但它的性能通常依赖多数类丰富的标记数据,对标记稀缺的少数类节点可能存在表征偏差。传统过采样方法通过重复少数类样本可缓解类别不均衡,但容易导致局部邻域过拟合。近期研究尝试基于... 图神经网络(GNN)在节点分类任务中取得了显著成功,但它的性能通常依赖多数类丰富的标记数据,对标记稀缺的少数类节点可能存在表征偏差。传统过采样方法通过重复少数类样本可缓解类别不均衡,但容易导致局部邻域过拟合。近期研究尝试基于少数类锚点合成新节点,但未充分挖掘少数类与邻近类之间的关联信息,导致生成样本存在类边界模糊性问题。针对上述挑战,提出一种竞争损失驱动的生成式不平衡节点分类算法(GraphCG),设计特征-结构协同的辅助点筛选机制,通过融合节点特征与局部结构,精准定位可增强类边界的邻居类辅助点,并构造竞争性边界约束损失函数,以强制生成节点与多数类在嵌入空间中保持可分离的几何边界。实验结果表明,相较于当前的先进方法,GraphCG在多个类别不平衡数据集上表现出显著优势。GraphCG不仅可以增强数据的多样性,还可以提升类别可分性,避免少数类被多数类压制。 展开更多
关键词 图神经网络 节点分类 非平衡数据 竞争损失 可分性
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海珠模式:中国特色数据经纪人的实践探索 认领 引用
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作者 奉国和 彭凯林 邓伟伟 《深圳社会科学》 2026年第1期28-37,共10页
数据经纪人在数据共享、流通、交易及应用等关键环节中扮演着重要角色。深入剖析了数据经纪人的内涵、特征、分类、理论与实践认识,并以广州市海珠区数据经纪人的典型实践案例为研究对象,揭示了数据经纪人在促进数据开放共享、流通与交... 数据经纪人在数据共享、流通、交易及应用等关键环节中扮演着重要角色。深入剖析了数据经纪人的内涵、特征、分类、理论与实践认识,并以广州市海珠区数据经纪人的典型实践案例为研究对象,揭示了数据经纪人在促进数据开放共享、流通与交易、提升资源配置效率以及释放数据要素价值方面的积极作用,提炼出具有中国特色的海珠数据经纪人创新模式,为数据经纪人行业的健康发展提供了借鉴与启示。研究表明,海珠区的数据经纪人在理论创新应用、制度创新与规范引领、规模与质量等方面具有明显优势,同时在角色定位、功能拓展及运行模式等方面更具创新应用。海珠区明确数据经纪人的三重角色--受托行权、风险控制、价值挖掘,不再局限于数据交易的撮合,还能够深入参与到数据的授权、风险管理和价值创造等环节,为数据要素市场提供更为全面和专业的服务。基于海珠区实践,建议进一步明确数据经纪人权责边界,完善分类分级管理体系,推动数据定价与标准化建设,并探索包容审慎的监管机制,以促进数据要素安全高效流通。 展开更多
关键词 数据经纪人 分类分级 数据三权分置 科斯定理 海珠模式
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基于深度学习的二维VSP数据纵横波分离研究 认领 引用
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作者 黄河 孟涛 +3 位作者 王腾飞 程玖兵 徐蔚亚 朱成宏 《石油物探》 CAS CSCD 北大核心 2026年第3期442-458,共17页
纵横(P/S)波分离是多分量垂直地震剖面(VSP)地震数据处理中的关键环节之一。传统的VSP波场分离方法多依赖信号分析或偏振投影等技术实现波模式的分解。然而在实际观测过程中,强烈的垂向速度变化及井身倾斜等复杂因素显著增加了波场分离... 纵横(P/S)波分离是多分量垂直地震剖面(VSP)地震数据处理中的关键环节之一。传统的VSP波场分离方法多依赖信号分析或偏振投影等技术实现波模式的分解。然而在实际观测过程中,强烈的垂向速度变化及井身倾斜等复杂因素显著增加了波场分离的难度。对此,结合弹性波动理论与亥姆霍兹分解理论,构建了适用于复杂观测条件下的多分量VSP数据P/S波标签库,提出了基于深度神经网络的VSP波场分离方法。该方法利用U-Net网络结构提取二维VSP数据中的P/S波场特征,实现了无需依赖模型参数的P/S波分离。模拟数据与实际数据的实验结果表明,在结合目标数据特性构建训练样本的基础上,深度学习方法能够有效完成二维多分量VSP数据的P/S波分离。此外,通过分析井源距和井身倾斜等因素对神经网络性能的影响,针对性地提出了提升网络泛化性能的策略,为多分量VSP地震数据的P/S波分离提供了有效的技术支撑。 展开更多
关键词 VSP P/S波分离 深度学习 数据标签构建 卷积神经网络
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基于多模态知识对齐的双分支点云语义分割算法 认领 引用
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作者 杨军 卯恒睿 党吉圣 《浙江大学学报（工学版）》 EI CAS CSCD 北大核心 2026年第9期1924-1933,共10页
针对多模态语义分割方法中因引入二维图像信息而带来的额外计算量,以及不同模态之间特征差异显著、融合困难等问题,提出基于二维图像信息辅助的多模态点云语义分割算法.通过双分支特征提取网络分别提取点云特征和RGB图像特征.为了减少... 针对多模态语义分割方法中因引入二维图像信息而带来的额外计算量,以及不同模态之间特征差异显著、融合困难等问题,提出基于二维图像信息辅助的多模态点云语义分割算法.通过双分支特征提取网络分别提取点云特征和RGB图像特征.为了减少因引入RGB图像而带来的额外计算负担,设计特征分离卷积,优化所提取的二维图像特征.采用点到像素的映射策略,将三维点云特征转换为与二维图像特征兼容的表示形式.设计多模态知识对齐模块,通过双融合注意力机制聚焦点云和RGB图像的关键特征,使点云特征与RGB图像特征映射到统一的特征空间,消除模态间的差异,使得模型能够更全面地感知环境.该算法在SemanticKITTI和NuScenes数据集上的语义分割精度分别达到69.1%和79.3%,优于其他主流算法.实验结果表明,该算法通过结合点云信息与RGB图像信息,发挥多模态数据的互补优势,有效提升点云语义分割的精度. 展开更多
关键词 RGB图像数据 点云数据 点云语义分割 多模态知识对齐 特征分离卷积
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基于多源数据融合的东大别地区岩石圈磁场构建及与构造关系分析 认领 引用
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作者 储飞 肖伟鹏 +6 位作者 孙鸿博 梁霄 方震 黄显良 孙伯乐 应允翔 郑海刚 《地震地质》 EI CSCD 北大核心 2026年第2期460-474,共15页
文中基于等效源法融合东大别地区地面磁测数据与航空磁测数据构建高精度岩石圈磁场模型,以插值切割法对岩石圈磁场进行位场分离,从而获取不同层位磁场分布,并结合研究区地质构造分布特征,分析相关构造及地层对岩石圈磁场的控制作用。结... 文中基于等效源法融合东大别地区地面磁测数据与航空磁测数据构建高精度岩石圈磁场模型,以插值切割法对岩石圈磁场进行位场分离,从而获取不同层位磁场分布,并结合研究区地质构造分布特征,分析相关构造及地层对岩石圈磁场的控制作用。结果显示,融合构建的岩石圈磁场模型精度较高,较为清晰地刻画出北淮阳褶皱带的巨大负异常条带及大别山隆起因岩浆作用而形成的正异常块体。位场分离结果显示,区内发育的多条区域性断裂对磁场都有一定的切割和控制作用,其中从不同深度磁场分布分析认为土地岭-落儿岭断裂的切割深度为10~15km,北淮阳褶皱带的巨大负异常条带主要来自于15~25km的深部异常,且青山-晓天断裂和肥西-韩摆渡断裂分别是该构造单元的南、北界限,尤其在25km和30km深度处该特征最为明显,说明这2个断裂均为区域深大断裂。 展开更多
关键词 东大别 地面磁测 航空磁测 数据融合 岩石圈磁场 位场分离 构造相关性
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数据流通的三元价值冲突与治理结构重塑 认领 引用
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作者 商建刚 《武汉科技大学学报（社会科学版）》 2026年第3期37-49,共13页
数据流通面临安全保障、效率提升与权利保护之间的结构性张力,常被概括为“不可能三角”。既有研究多从单一维度展开,或主张通过静态确权强化排他性激励,或依赖行为规制维护竞争秩序,难以回应三元价值的系统性冲突。既有理论路径与规范... 数据流通面临安全保障、效率提升与权利保护之间的结构性张力,常被概括为“不可能三角”。既有研究多从单一维度展开,或主张通过静态确权强化排他性激励,或依赖行为规制维护竞争秩序,难以回应三元价值的系统性冲突。既有理论路径与规范演进表明,应以“行为规制”与“风险分级”为核心逻辑,重构数据流通治理结构。在权利结构层面,需从静态确权思维转向行为规制路径;在安全机制层面,应从统一管控转向构建场景化风险识别体系。通过统一的行为规制与风险分级设计,并辅之以数字基础设施作为技术支撑,可将安全、效率与权利保护嵌入数据流通的全过程,为破解数据流通“不可能三角”提供兼具理论自洽性与实践可行性的中国方案。 展开更多
关键词 数据流通 不可能三角 权利分置 风险分级 数据治理
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