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3D forward modeling and response analysis for marine CSEMs towed by two ships

Applied Geophysics 2018年第1期15卷 11-25,147页

作者： Zhang Bo Yin Chang-Chun Liu Yun-He Ren Xiu-yan Qi yan-Fu and Cai Jing college of Geo-Exploration sciences and technology Jilin University Changchun 130026 China School of Geology and Survey Engineering Changan University Xi＇an 710054 China

A dual-ship-towed marine electromagnetic （EM） system is a new marine exploration technology recently being developed in china. Compared with traditional marine EM systems, the new system tows the transmitters and receivers using two ships, rendering it unnecessary to position EM receivers at the seafloor in advance. This makes the system more flexible, allowing for different configurations （e.g., in-line, broadside, and azimuthal and concentric scanning） that can produce more detailed underwater structural information. We develop a three-dimensional goal-oriented adaptive forward modeling method for the new marine EM system and analyze the responses for four survey configurations. Ocean-ottom topography has a strong effect on the marine EM responses; thus, we develop a forward modeling algorithm based on the finite-element method and unstructured grids. To satisfy the requirements for modeling the moving transmitters of a dual-ship-towed EM system, we use a single mesh for each of the transmitter locations. This mitigates the mesh complexity by refining the grids near the transmitters and minimizes the computational cost. To generate a rational mesh while maintaining the accuracy for single transmitter, we develop a goal-oriented adaptive method with separate mesh refinements for areas around the transmitting source and those far away. To test the modeling algorithm and accuracy, we compare the EM responses calculated by the proposed algorithm and semi-analytical results and from published sources. Furthermore, by analyzing the EM responses for four survey configurations, we are confirm that compared with traditional marine EM systems with only in-line array, a dual-ship-towed marine system can collect more data.

关键词： marine electromagnetics dual-ship-towing seafloor modeling

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Efficient Probabilistic Load Flow Calculation Considering Vine Copula⁃Based Dependence Structure of Renewable Energy Generation

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Journal of Donghua university(English Edition) 2021年第5期38卷 465-470页

作者： MA Hongyan WANG Han XU Xiaoyuan yan Zheng MAO Guijiang college of information science and technology Donghua UniversityShanghai 200051China Key Laboratory of Control of Power Transmission and Conversion(Shanghai Jiao Tong university) Ministry of EducationShanghai 200240China State Grid Quzhou Power Supply Company Quzhou 324000China

Correlations among random variables make significant impacts on probabilistic load flow(PLF)calculation *** the existing studies,correlation coefficients or Gaussian copula are usually used to model the correlations,while vine copula,which describes the complex dependence structure(DS)of random variables,is seldom discussed since it brings in much heavier computational *** overcome this problem,this paper proposes an efficient PLF method considering input random variables with complex ***,the Rosenblatt transformation(RT)is used to transform vine copula⁃based correlated variables into independent ones;and then the sparse polynomial chaos expansion(SPCE)evaluates output random variables of PLF *** effectiveness of the proposed method is verified using the IEEE 123⁃bus system.

关键词： probabilistic load flow(PLF) vine copula sparse polynomial chaos expansion(SPCE) Rosenblatt transformation(RT)

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Research and Application on Tangka Image Segmentation Algorithm

Research and Application on Tangka Image Segmentation Algori...

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2015 3rd International Conference on Machinery,Materials and information technology Applications(ICMMITA 2015)

作者： yan Xu WeiLan Wang Northwest university for Nationalities Mathematics and computer science college

This paper studies the key problems of many Tangka image segmentation algorithms and computational complexity and hard to applies to large scale images segmentation. As a exploratory research of Tangka image, the paper fully took the comprehensive and robustness of algorithm into account. The image segmentation based on saliency area detection had nice translational, multi feature combination and rotational invariance, so we focus on image segmentation. First, design the algorithm based on clustering analysis theory and segments the fuzzy image, especially the fuzzy edge. Then we improve the Tangka segmentation algorithm in order to meet high precision of the application. Meanwhile, Tangka image segmentation offer convenience for research in future, and the final recognition result was satisfy us according to the experiment.

关键词： Tangka image segmentation algorithm image segmentation clustering analysis multi-feature combination

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带边缘增强的双树复小波阈值去噪方法

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激光与光电子学进展 2023年第4期60卷 315-322页

作者：唐超石艳广州科技职业技术大学信息工程学院广东广州510550 岭南师范学院信息工程学院广东湛江524048

针对现有的高斯噪声去除方法的边缘保持能力差、去噪图像对比度低等缺陷,提出一种带边缘增强的双树复小波阈值去噪方法。充分利用双树复小波的平移不变性和多方向选择性等优秀特性,根据高斯噪声的数学模型,由假设推导出一种自适应的双... 详细信息

针对现有的高斯噪声去除方法的边缘保持能力差、去噪图像对比度低等缺陷,提出一种带边缘增强的双树复小波阈值去噪方法。充分利用双树复小波的平移不变性和多方向选择性等优秀特性,根据高斯噪声的数学模型,由假设推导出一种自适应的双树复小波阈值去噪模型;提出一种多向梯度算子,对由阈值去噪模型得出的去噪图像进行边缘提取;最后对边缘图像与去噪图像进行线性有参叠加,得到边缘增强的去噪图像。实验结果证明,所提方法具有良好的去噪性能、边缘保持能力和快速的计算效率。

关键词：图像去噪双树复小波阈值去噪边缘增强多向梯度算子

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The Applications of Generalized Computing In Knowledge Management

The Applications of Generalized Computing In Knowledge Manag...

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2005年公共管理国际会议

作者： YAO Min SHEN Bin ZHANG yan-gu college of Computer Zhejiang University Provincial Key Lab. for Computer information processing technology in Jiangsu Suzhou University School of Computer Wenzhou Normal College

Generalized computing is a new kind of intelligent computing systems, which combines symbolic intelligence and computational intelligence (including neural computing, fuzzy computing and evolutional computing) together. By introducing generalized computing into knowledge management, this paper presents a kind of knowledge decision-making model, and a kind of control model of enterprise knowledge flow.

关键词： Generalized computing Knowledge management Enterprise management

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无源声呐场景中使用辅助粒子滤波的邻近目标检测前跟踪方法

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声学学报 2023年第2期48卷 277-290页

作者：王燕李想齐滨梁国龙哈尔滨工程大学水声技术重点实验室哈尔滨150001 工业和信息化部海洋信息获取与安全工信部重点实验室(哈尔滨工程大学) 哈尔滨150001 哈尔滨工程大学水声工程学院哈尔滨150001 青岛海纳水下信息技术有限公司青岛266400

针对无源声呐多目标方位跟踪问题,研究了一种基于粒子滤波的检测前跟踪方法,关注于改善邻近目标和机动目标的跟踪性能。首先,提出了一种考虑了邻近目标影响的似然函数;其次,采用辅助变量利用量测信息优化粒子采样,当算法运动模型与目标... 详细信息

针对无源声呐多目标方位跟踪问题,研究了一种基于粒子滤波的检测前跟踪方法,关注于改善邻近目标和机动目标的跟踪性能。首先,提出了一种考虑了邻近目标影响的似然函数;其次,采用辅助变量利用量测信息优化粒子采样,当算法运动模型与目标实际运动状态失配时,这种策略具有很大优势。结合以上两点,提出了一种检测前跟踪算法,该算法将邻近目标划分为一组,使用邻近目标的预测状态计算目标的似然,计算效率较高。利用仿真生成的数据和海上采集的实际数据分别验证了该算法的性能,并与其他多目标粒子滤波检测前跟踪算法进行比较,证明了该算法具有良好的跟踪性能。在目标邻近和目标机动的情况下,该算法的优势更加明显。

关键词：纯方位跟踪检测前跟踪粒子滤波目标跟踪

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AN IMPROVED BICLUSTERING ALGORITHM AND ITS APPLICATION TO GENE EXPRESSION SPECTRUM ANALYSIS

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Genomics, Proteomics & Bioinformatics 2005年第3期3卷 189-193页

作者： Hua Qu Liu-Pu Wang yan-Chun Liang Chun-Guo Wu college of Software Key Laboratory of Symbol Computation and Knowledge Engineering of the Ministry of Education Jilin University Changchun 130012 China Guangzhou Institute of china Telecom Guangzhou 510630 China college of Computer science and technology Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun 130012 China Key Laboratory of information science and Engineering of the Ministry of Railway/Key Laboratory of Advanced information science and Network technology of Beijing Beijing Jiaotong University Beijing 100044 China.

Cheng and Church algorithm is an important approach in biclustering algorithms. In this paper, the process of the extended space in the second stage of Cheng and Church algorithm is improved and the selections of two important parameters are discussed. The results of the improved algorithm used in the gene expression spectrum analysis show that, compared with Cheng and Church algorithm, the quality of clustering results is enhanced obviously, the mining expression models are better, and the data possess a strong consistency with fluctuation on the condition while the computational time does not increase significantly.

关键词： biclustering algorithm gene expression pedigree analysis Cheng and Church algorithm

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Momentum Spectroscopy for Multiple Ionization of Cold Rubidium in the Elliptically Polarized Laser Field

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Chinese Physics Letters 2020年第5期37卷 33-37页

作者： Junyang Yuan Yixuan Ma Renyuan Li Huanyu Ma Yizhu Zhang Difa Ye Zhenjie Shen Tianmin yan Xincheng Wang Matthias Weidemüller Yuhai Jiang Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210 university of Chinese Academy of sciences Beijing 100049 School of Physical science and technology ShanghaiTech UniversityShanghai 201210 Center for Terahertz Waves and college of Precision Instrument and Optoelectronics Engineering Key Laboratory of the Ministry of EducationTianjin UniversityTianjin 300072 Laboratory of computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088 Hefei National Laboratory for Physical sciences at the Microscale and Shanghai Branch University of Science and Technology of ChinaShanghai 201315 CAS Center for Excellence and Synergetic Innovation Center in Quantum information and Quantum Physics University of Science and Technology of ChinaShanghai 201315 Physikalisches Institut Universitat HeidelbergIm Neuenheimer Feld 22669120 HeidelbergGermany

Employing recently developed magneto-optical trap recoil ion momentum spectroscopy(MOTRIMS)combined with cold atoms,strong laser pulse,and ultrafast technologies,we study momentum distributions of the multiply ionized cold rubidium(Rb)induced by the elliptically polarized laser pulses(35 fs,1.3×10^15 W/cm^2).The complete vector momenta of Rb^n+ions up to charge state n=4 are recorded with extremely high resolution(0.12 *** Rb^+).Variations of characteristic multi-bands are displayed in momentum distributions because the ellipticity varies from the linear to circular polarization,are interpreted qualitatively with the classical overbarrier ionization *** momentum spectroscopy of cold heavy alkali atoms presents novel strong-field phenomena beyond the noble gases.

关键词： polarization momentum alkali

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一致决策信息系统规则提取的形式向量方法

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计算机科学 2019年第10期46卷 236-241页

作者：延安闫心怡陈泽华太原理工大学电气与动力工程学院太原030024 太原理工大学大数据学院太原030024

知识表示与获取是人工智能领域的关键问题之一,规则提取是其中的一项重要研究内容。形式概念分析是针对大数据和不确定性知识的有效处理方法,被广泛应用于知识表示和数据挖掘等领域。形式概念分析可以实现决策信息系统的规则提取,首先... 详细信息

知识表示与获取是人工智能领域的关键问题之一,规则提取是其中的一项重要研究内容。形式概念分析是针对大数据和不确定性知识的有效处理方法,被广泛应用于知识表示和数据挖掘等领域。形式概念分析可以实现决策信息系统的规则提取,首先将决策信息系统转化为形式背景生成概念,进而通过概念运算获取规则。然而,概念的生成是一项复杂的运算过程,且生成的规则往往存在冗余属性。在形式背景的基础上,定义并讨论了形式向量及其性质,构建了形式向量树形拓扑图,提出了一种基于形式向量的决策信息系统最简规则快速提取算法。引入粒度的思想,由粗到细求取不同粒度空间下的形式向量,通过条件形式向量和决策形式向量的关系提取规则。基于树形拓扑图实现了规则提取过程的可视化,并且通过剪枝操作极大地减少了规则提取过程的实际时间开销。通过数学证明与实例分析验证了算法的正确性和有效性,通过对比实验证明了算法不仅具备更好的时效性而且具备较高的识别率。

关键词：粒计算形式背景形式向量规则获取决策信息系统

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Feature Extraction by Correntropy Based Average Neighborhood Margin Maximization 26th

Feature Extraction by Correntropy Based Average Neighborhood...

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第26届中国控制与决策会议

作者： Lin-Na Ma Hong-Jie Xing Shun-yan Hou Key Laboratory of Machine Learning and computational Intelligence College of Mathematics and Computer ScienceHebei University college of Electronics and information Engineering Hebei University

ISBN: (纸本)9781479937097

Average neighborhood margin maximization（ANMM） is a feature extraction method to make homogeneous points collect as near as possible and heterogeneous points disperse as far away as possible. To enhance the anti-noise ability of ANMM, correntropy based average neighborhood margin maximization（CANMM） is proposed in this paper. This method utilizes correntropy to substitute the Euclidean distance for measuring the similarity between the given data, and uses the maximum correntropy criterion to replace the maximum distance criterion, which makes CANMM more robust. The experimental results on three benchmark face databases validate the effectiveness of the proposed method.

关键词： Feature Extraction Half-quadratic optimization Correntropy ANMM

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