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Movement Invariants-based Algorithm for Medical Image Tilt Correction

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International Journal of Automation and computing 2010年第4期7卷 543-549页

作者： Mei-sen pan Jing-Tian Tang Xiao-Li Yang Institute of Biomedical Engineering School of Info-physics and Geomatics Engineering Central South University Changsha 410083 PRC Department of Computer Science and Technology Hunan University of Arts and Science Changde 415000 PRC

In this paper, the edge detection for a medical image is performed based on Sobel operator, and the bounding box is obtained, by which the effective medical sub-image is extracted. Then, the centroid and the normalized central moments of the medical sub-image are calculated, and the rotation angle a is obtained by minimizing the second-order central moment based on its rotation invariance. Finally, the whole medical image is rotated around the centroid by --a to correct the tilted image. F^rthermore, inspired by the uniformity degree of the image, the rotation angle ct is revised, which achieves a better correction effect and performance. The experimental results show that the proposed algorithms are fairly reliable and accurate for the determination of tilt angles, and are practical and effective tilt correction techniques.

关键词： Tilt correction central moment medical image image uniformity Sobel operator

Reflective feature location: knowledge in mind meets information in system

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Science China(Information Sciences) 2017年第7期60卷 112-129页

作者： Xin PENG Zhengchang XING sen pan Wenyi QIAN Vclav RAJLICH Wenyun ZHAO School of Computer Science Fudan University Shanghai Key Laboratory of Data Science Fudan University Research School of Computer Science Australian National University Department of Computer Science Wayne State University

Locating code entities relevant to a feature(i.e., feature location) is an important task in software maintenance. Feature location is challenging due to the information gap between the developer’s knowledge about a feature and the feature’s implementation in the system. In this paper, we present a reflective feature location approach Re FLex to bridge this gap. Re FLex automatically computes a reflexion model between the developer’s logical view of a feature and the feature’s implemented view reverse-engineered from the code. It provides interactive reflection support for the developer to refine the logical view and the feature location results such that the logical view and the implemented view converge gradually in an iterative feature location *** have implemented our approach as an Eclipse plugin and investigated the benefits and challenges in reflective feature location through a user study.

关键词： feature location information seeking reflexion model

Vehicle License Plate Character Segmentation

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International Journal of Automation and computing 2008年第4期5卷 425-432页

作者： Mei-sen pan Jun-Biao Yan Zheng-Hong Xiao Department of Computer Science and Technology Hunan University of Arts and ScienceChangde 415000PRC School of Information Science and Engineering Central South UniversityChangsha 400083PRC

Vehicle license plate (VLP) character segmentation is an important part of the vehicle license plate recognition system (VLPRS).This paper proposes a least square method (LSM) to treat horizontal tilt and vertical tilt in VLP *** lines are added into the image (or the tilt-corrected image) to make the separated parts of each Chinese character to be an interconnected *** noise regions will be eliminated after two fusing images are merged according to the minimum principle of gray values. Then,the characters are segmented by projection method (PM) and the final character images are *** experimental results show that this method features fast processing and good performance in segmentation.

关键词： Vehicle license plate (VLP) least square method (LSM) auxiliary lines character segmentation pixel.

An Adaptive Median Filter Algorithm Based on B-spline Function

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International Journal of Automation and computing 2011年第1期8卷 92-99页

作者： Mei-sen pan Jing-Tian Tang Xiao-Li Yang College of Computer Science and Technology Hunan University of Arts and Science Changde 415000 PRC Institute of Biomedical Engineering School of Info-physics and Geomatics Engineering Central South University Changsha 410083 PRC

According to the B-spline convolution mask, first, the contrast sensitiveness （CS） is computed and then is viewed as a noise sensitiveness coeficient （NSC） to adaptively determine a noise-recognized threshold value. Based on the noise density function （NDF） in a 3×3 window, the filtering window size is adaptively adjusted, and then a median filter is used to eliminate the noise-marked pixels. The experiment results show that the proposed algorithm can preserve image detail information well and effectively remove the noises, particularly the impulse noises that is also called salt-and-pepper noises superimposed on the computed tomography （CT） and magnetic resonance imaging （MRI） medical images.

关键词： Salt-and-pepper noise median filter human vision system B-spline.

International Workshop on Cavitation was held in Wuxi

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Journal of Hydrodynamics 1989年第3期1卷 101-102页

作者： pan sen-sen Peng Xiao-Xing

There was warm weather, sunshine with no rain," International Workshop onCavitation" was held in Hubin Motel of Wuxi city, April 11-12, 1989. The workshop is jointly sponsored and supported by the Material and EngineeringDivision, the mathematics and Physics Division and the International CooperationBureau of the National Natural Science Foundation of China (NNSFC). China Ship

关键词： mathematics jointly weather sunshine workshop Dalian Nanjing Wuhan Bubble Erosion

Distributed Estimation of Oscillations in Power Systems: An Extended Kalman Filtering Approach

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CSEE Journal of Power and Energy Systems 2019年第2期5卷 181-189页

作者： Zhe Yu Di Shi Zhiwei Wang Qibing Zhang Junhui Huang sen pan GEIRI North America San JoseCA 95134USA. State Grid Jiangsu Electric Power Company Nanjing 210024China Global Energy Interconnection Research Institute Nanjing 210024China

Online estimation of electromechanical oscillation parameters provides essential information to prevent system instability and blackout and helps to identify event categories and *** formulate the problem as a state space model and employ the extended Kalman filter to estimate oscillation frequencies and damping factors directly based on data from phasor measurement *** to considerations of communication burdens and privacy concerns,a fully distributed algorithm is proposed using diffusion extended Kalman *** effectiveness of proposed algorithms is confirmed by both simulated and real data collected during events in State Grid Jiangsu Electric Power Company.

关键词： Distributed estimation extended Kalman filter oscillation detection and estimation

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基于多源数据深度融合的配电网运行评价方法

中国电力 2024年第6期57卷 193-203页

作者：乔俊峰周爱华彭林王一清沈晓峰潘森杨佩黄晨宏国网智能电网研究院有限公司电力网络安全防护与监测技术实验室江苏南京210003 国网江苏省电力有限公司徐州供电公司江苏徐州221005 国网上海市电力公司青浦供电公司上海201799

配电网作为供电环节中的最后一环,其运行水平决定了供电服务质量,因此配电网运行评价是供电单位的重要工作。但配电网运行评价工作受到跨业务数据资源难以融合、评价指标选择难以反映实际配电网运行状况等条件限制,现有评价方法难以实... 详细信息

配电网作为供电环节中的最后一环,其运行水平决定了供电服务质量,因此配电网运行评价是供电单位的重要工作。但配电网运行评价工作受到跨业务数据资源难以融合、评价指标选择难以反映实际配电网运行状况等条件限制,现有评价方法难以实施应用。针对这一问题,提出一种基于多源数据深度融合的配电网运行评价方法,首先对区域配电网进行网格化划分,然后基于地址分级匹配算法对跨业务的多源异构数据进行深度融合。在此基础上,提取并设计配电网运行评价指标体系,构建基于多层权重约束的配电网运行综合评价模型,求解配电网综合评价结果。最后研发配电网运行评价系统,支持配电网各业务系统的多源异构数据的统一接入,实现配电网评价功能的可视化、智能化应用。研究成果配电网运行评价系统已采用某省级电网公司数据中台的相关数据进行配电网运行状态评估试验验证,以实际运行数据验证了所述方法的准确性和适用性。

关键词：配电网运行评价网格化划分深度数据融合评价指标体系评价验证

NUCLEI SPECTRUM FUNCTION AND ITS DERIVATION

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Journal of Hydrodynamics 1989年第3期1卷 69-76页

作者： pan sen-sen, China Ship Scientific Research Center, Wuxi, P.R. China

Starting from a discussion on the cavitation nuclei spectrum function, an idea of simplifying the measurement of cavitation nuclei is proposed. The flow speed effect with rather high power on cavitation nuclei populat... 详细信息

关键词：二闪 NUCLEI SPECTRUM FUNCTION AND ITS DERIVATION Zhang ITS

Microstructure and Mechanical Property of the Large Cross-Sectioned Mg-Gd-Y-Zn-Zr Alloy Produced by Small Extrusion Ratio

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 999-1006页

作者： sen Wang Hucheng pan Caixia Jiang Zhihao Zeng Zhen pan Weineng Tang Chubin Yang Yuping Ren Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang110819China Mg and Mg Alloy Institute Technology CenterBaosteel Metal Co.LtdChina Baowu Steel GroupShanghai200940China Jiangxi Provincial Engineering Research Center for Magnesium Alloy Gannan Normal UniversityGanzhou341000China

In this work,the microstructure and mechanical properties of large cross-sectioned Mg-9Gd-3Y-1.2Zn-0.5Zr(VWZ931)samples produced by the small extrusion ratio has been *** as-extruded VWZ931 sample with diameter of~30 mm can exhibit the high yield strength(YS)of 339 MPa,ultimate tensile strength(UTS)of 387 MPa and elongation of 8.2%,*** peak-aged,the YS and UTS of the Mg samples were significantly increased to 435 MPa and 467 *** small extrusion ratio leads to the low fraction of dynamic recrystallized(DRX)grains in VWZ931 sample,and the texture hardening effect can be fully utilized to achieve high *** combined effect of precipitation strengthening due to the long-period stacking ordered phases and theβ′phase,grain boundary strengthening due to the fine DRX grains,heterogeneous deformation-induced strengthening caused by bimodal microstructure,can together contribute to the high strength of present Mg *** findings can shed light on designing other large-sized Mg wrought alloys with high mechanical performance.

关键词： Mg-RE alloy Mechanical property Bimodal grains Texture hardening