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高校校园网格化视频安防系统布点模型设计 预览
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作者 尚子田 宁玉文 江祥奎 《信息技术》 2019年第6期64-68,共5页
视频安防系统是高校安全综合防控体系的重要内容,为了探索高校视频监控点位的布局方法,文中对高校安防对象划分了点型、线型和面型三类,并按照网格化管理的思想,设计了高校安防终端网格化布点模型,分析了九种视频安防终端功能,提出了校... 视频安防系统是高校安全综合防控体系的重要内容,为了探索高校视频监控点位的布局方法,文中对高校安防对象划分了点型、线型和面型三类,并按照网格化管理的思想,设计了高校安防终端网格化布点模型,分析了九种视频安防终端功能,提出了校园四种部署场景的视频监控终端部署配置方法,为高校视频安防系统终端的布点提供了位置判断和设备选型的依据。 展开更多
关键词 高校 网格化 平安校园 视频安防 布点
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Application of Genetic Algorithm in Estimation of Gyro Drift Error Model
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作者 LI Dongmei BAI Taixun +1 位作者 HE Xiaoxia ZHANG Rong 《中国航天:英文版》 2019年第1期3-8,共6页
Extended Kalman Filter(EKF)algorithm is widely used in parameter estimation for nonlinear systems.The estimation precision is sensitively dependent on EKF’s initial state covariance matrix and state noise matrix.The ... Extended Kalman Filter(EKF)algorithm is widely used in parameter estimation for nonlinear systems.The estimation precision is sensitively dependent on EKF’s initial state covariance matrix and state noise matrix.The grid optimization method is always used to find proper initial matrix for off-line estimation.However,the grid method has the draw back being time consuming hence,coarse grid followed by a fine grid method is adopted.To further improve efficiency without the loss of estimation accuracy,we propose a genetic algorithm for the coarse grid optimization in this paper.It is recognized that the crossover rate and mutation rate are the main influencing factors for the performance of the genetic algorithm,so sensitivity experiments for these two factors are carried out and a set of genetic algorithm parameters with good adaptability were selected by testing with several gyros’experimental data.Experimental results show that the proposed algorithm has higher efficiency and better estimation accuracy than the traversing grid algorithm. 展开更多
关键词 genetic ALGORITHM traversing GRID ALGORITHM coarse GRID optimization GYRO DRIFT error model CROSSOVER RATE and mutation RATE selecting
Improved virtual synchronous control for grid-connected VSCs under grid voltage unbalanced conditions 预览
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作者 Lei SHANG Jiabing HU +1 位作者 Xiaoming YUAN Yunhui HUANG 《现代电力系统与清洁能源学报(英文)》 CSCD 2019年第1期174-185,共12页
This paper presents an improved virtual synchronous control(VSynC) for the grid-connected voltage source converter(VSC) so as to continuously operate under the grid voltage with steady unbalance.The improved VSynC int... This paper presents an improved virtual synchronous control(VSynC) for the grid-connected voltage source converter(VSC) so as to continuously operate under the grid voltage with steady unbalance.The improved VSynC introduces the negative sequence power controls on basis of conventional VSynC.The improved VSynC is capable of regulating the negative sequence internal voltage to reduce the negative-sequence injected currents and oscillated powers of the VSC aroused by the negative-sequence grid voltage.Three alternative local control objectives for the VSC itself under steady state unbalanced grid conditions and their corresponding power references are deduced and computed.Simulated and experimental results are presented to validate the correctness and effectiveness of the proposed improved VSynC to enhance the continuous operation performance of VSynC-based VSCs during grid voltage steady-state unbalance. 展开更多
关键词 Grid VOLTAGE UNBALANCE VIRTUAL SYNCHRONOUS control(VSynC) GRID-CONNECTED VOLTAGE source converter(VSC)
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基于Ibeacon的选煤厂设备运维信息系统
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作者 白晋铭 王然风 付翔 《煤炭技术》 CAS 2019年第5期174-176,共3页
为了更好地解决选煤厂巡检与维护过程中出现的工作交接、信息传递问题,深入分析了Ibeacon室内定位技术的原理和算法,并提出了更适用于生产现场的坐标网格定位算法,设计了选煤厂设备运维信息系统,详细介绍了系统的架构、坐标网格的建立... 为了更好地解决选煤厂巡检与维护过程中出现的工作交接、信息传递问题,深入分析了Ibeacon室内定位技术的原理和算法,并提出了更适用于生产现场的坐标网格定位算法,设计了选煤厂设备运维信息系统,详细介绍了系统的架构、坐标网格的建立、通信方式、实现的功能。基于Ibeacon技术的选煤厂运维信息系统具有部署方便、功能强大、扩展性强、价格低廉等优势。 展开更多
关键词 Ibeacon定位 坐标网格 信息系统 室内导航 就地推送
Revision of CG Flash Density Based on Lightning Location Data 预览
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作者 Peng Guoping 《气象与环境研究:英文版》 CAS 2019年第2期69-72,77共5页
Using the data of the Lightning Location System( LLS) over Hubei Province,through the analysis of the distribution characteristics of CG( Cloud-to-Ground) flash density in 2015,it was found that the layout of the dete... Using the data of the Lightning Location System( LLS) over Hubei Province,through the analysis of the distribution characteristics of CG( Cloud-to-Ground) flash density in 2015,it was found that the layout of the detection station had influence on the spatial distribution of lightning.Grid CG flash density data were used to characterize the spatial distribution of the CG flash,and station distance factor was used to characterize the detection station layout. The result showed that there existed negative correlation between density and factor,significant correlation between the density component and the factor for the lightning current amplitude of 5 to 30 kA,and insignificant correlation between >30 kA of density component and factor. So it is necessary to revise the density to eliminate the influence of the station layout. On the basis of the linear regression method and its residual theory,the revision model of the grid CG flash density and the statistical model of relative detection efficiency were established. The result consistency of segment and non-segmented revision of the density was verified. Through the contrastive analysis of theoretical detection efficiency and relative detection efficiency,the feasibility for revision method of CG flash density and the statistical method of relative detection efficiency was also verified. 展开更多
关键词 LIGHTNING location system LATITUDE and LONGITUDE grid REVISION of CG flash DENSITY Detection efficiency Regression analysis RESIDUAL theory
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Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency
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作者 XIE Xiang-ping WEI Fang-qiang +1 位作者 WANG Xiao-jun YANG Hong-juan 《山地科学学报:英文版》 SCIE CSCD 2019年第3期619-629,共11页
The herringbone water-sediment separation structure(HWSSS) was developed to prevent debris flows. This paper mainly focuses on evaluating the sediment separation efficiency of HWSSS in debris flow prevention and deter... The herringbone water-sediment separation structure(HWSSS) was developed to prevent debris flows. This paper mainly focuses on evaluating the sediment separation efficiency of HWSSS in debris flow prevention and determining the grid opening width D, a crucial structure parameter for HWSSS design. Theoretical analysis on the total sediment separation rate Pt reveals that the efficiency of sediment separation is much related with sediment grain size distribution(GSD) and grid opening width. The lower limit of Pt is deduced from the perspective of safety consideration by transforming debris flow into sediment-laden flow. Hydraulic model tests were carried out. Based on the regression analysis of the experimental data, the quantitative relationships between Pt and D and GSD characteristic values were finally established. A procedure for determining optimal grid opening width is proposed based on these analyses. These results are of significance in evaluating sediment separation effect by HWSSS in debris flow prevention and contribute to a more explicit methodology for design of HWSSS. 展开更多
关键词 Debris flow Water-sediment SEPARATION Structure design SEDIMENT SEPARATION efficiency GRID OPENING WIDTH
浅谈城市供电网格化综合服务 预览
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作者 段智 张明昭 +1 位作者 蒋成成 郭金星 《安徽电力》 2019年第1期59-62,共4页
网格化综合服务是现代供电服务体系的一部分,是营配末端融合的重要体现。首先阐述了网格化综合服务的发展过程,然后分别从供电企业的内部和外部形势,阐述网格化综合服务发展的必要性,从人员配置、队伍管理、业务平台、考核评价、数据贯... 网格化综合服务是现代供电服务体系的一部分,是营配末端融合的重要体现。首先阐述了网格化综合服务的发展过程,然后分别从供电企业的内部和外部形势,阐述网格化综合服务发展的必要性,从人员配置、队伍管理、业务平台、考核评价、数据贯通等方面详细说明网格化综合发展的制约因素,从网格划分、协同配合、服务模式详细说明网格化综合服务的模式,并进行了近期和远景目标分析:构建网格化综合服务体系,破除营配专业壁垒,提升运营效率效益和供电优质服务质量,进而达到建设现代能源服务体系的目的。 展开更多
关键词 城市供电 网格化 供电服务 服务体系
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Spark框架下分布式K-means算法优化方法 预览
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作者 王法玉 刘志强 《计算机工程与设计》 北大核心 2019年第6期1595-1600,共6页
针对传统K-means算法在处理海量数据时存在计算效率低和时间复杂度高的缺点,提出一种基于Spark计算框架的改进K-means算法。利用网格单元保存数据点的空间位置信息,通过与聚类中心的空间位置关系减少冗余计算,为提高算法处理海量数据的... 针对传统K-means算法在处理海量数据时存在计算效率低和时间复杂度高的缺点,提出一种基于Spark计算框架的改进K-means算法。利用网格单元保存数据点的空间位置信息,通过与聚类中心的空间位置关系减少冗余计算,为提高算法处理海量数据的能力,采用Spark框架对算法进行并行化实现。在集群环境下进行测试,基于Spark框架的改进后算法能有效降低计算的时间复杂度,算法具有良好扩展性,计算效率有显著提高。 展开更多
关键词 K-MEANS算法 Spark计算框架 分布式 网格 空间位置
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基于格网的线性核密度计算与表达方法 预览
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作者 陈慧 傅学庆 +1 位作者 李仁杰 刘伟 《地理与地理信息科学》 CSCD 北大核心 2019年第4期15-20,共6页
人类活动通常基于二维地表,受限于一维路网,在路网约束下研究人类空间行为模式相较于传统分析方法意义更大。该文以研究点数据聚类方式的核密度方法为例,提取核心公式应用于道路网络,提出线性核密度计算方法。将格网化后的线性空间单元... 人类活动通常基于二维地表,受限于一维路网,在路网约束下研究人类空间行为模式相较于传统分析方法意义更大。该文以研究点数据聚类方式的核密度方法为例,提取核心公式应用于道路网络,提出线性核密度计算方法。将格网化后的线性空间单元作为计算主体,研究空间点数据在线性单元约束下的分布特点,并以典型的线性旅游景区——九寨沟为例,分析游客照片点数据沿“人”字形景区线路的空间分布模式。结果表明:整体上线性核密度算法所产生的聚集区域与传统方法基本吻合;与线性核密度计算结果对比,平面核密度生成的峰值点距离路网40~222m(以最短距离测算),存在较大误差;线性核密度算法能满足不同尺度路网下的应用研究且运行效率较高。综上,线性核密度算法为研究路网约束下点数据的空间分布提供了一种新的量化工具,可优化传统分析效果,为旅游地规划管理、景区智能化服务提供更为准确的决策信息。 展开更多
关键词 核密度 线性单元 格网 点数据 空间分布
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Research and Application of Distributed Data Mining Method for Improving Rural Power Grid Enterprises in Production and Operation Status Evaluation 预览
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作者 Gao Xiu-yun Xiang Wen Fang Jun-long 《东北农业大学学报:英文版》 CAS 2019年第2期87-96,共10页
With the reform of rural network enterprise system,the speed of transfer property rights in rural power enterprises is accelerated.The evaluation of the operation and development status of rural power enterprises is d... With the reform of rural network enterprise system,the speed of transfer property rights in rural power enterprises is accelerated.The evaluation of the operation and development status of rural power enterprises is directly related to the future development and investment direction of rural power enterprises.At present,the evaluation of the production and operation of rural network enterprises and the development status of power network only relies on the experience of the evaluation personnel,sets the reference index,and forms the evaluation results through artificial scoring.Due to the strong subjective consciousness of the evaluation results,the practical guiding significance is weak.Therefore,distributed data mining method in rural power enterprises status evaluation was proposed which had been applied in many fields,such as food science,economy or chemical industry.The distributed mathematical model was established by using principal component analysis(PCA)and regression analysis.By screening various technical indicators and determining their relevance,the reference value of evaluation results was improved.Combined with statistical program for social sciences(SPSS)data analysis software,the operation status of rural network enterprises was evaluated,and the rationality,effectiveness and economy of the evaluation was verified through comparison with current evaluation results and calculation examples of actual grid operation data. 展开更多
关键词 RURAL power GRID PRODUCTION and management distributed data mining STATISTICAL program for SOCIAL sciences(SPSS19)
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基于网格数据中心的密度峰值聚类算法 预览
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作者 李晓光 邵超 《计算机科学》 CSCD 北大核心 2019年第B06期457-460,487共5页
通过对数据集进行网格划分来降低聚类过程中的计算复杂度,提出了一种基于网格数据中心的密度峰值聚类算法。首先将数据集进行网格化,形成若干网格对象,以落在网格内的数据点个数与通过衰减后的相邻网格内数据点个数之和作为该网格对象... 通过对数据集进行网格划分来降低聚类过程中的计算复杂度,提出了一种基于网格数据中心的密度峰值聚类算法。首先将数据集进行网格化,形成若干网格对象,以落在网格内的数据点个数与通过衰减后的相邻网格内数据点个数之和作为该网格对象的局部密度值,以该网格数据中心到更高密度网格数据中心的最近距离作为该网格对象的相对距离值;然后根据簇心网格对象同时具备更高的局部密度和较大的相对距离的特征,确定簇心网格对象;最后通过密度划分的方法完成数据聚类。在UCI人工数据集上的仿真实验表明,该算法能够在较短的时间内有效地处理大规模数据,聚类准确率较高。 展开更多
关键词 密度峰值 聚类 网格 数据中心 决策图
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Small-signal stability analysis of photovoltaic generation connected to weak AC grid 预览
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作者 Qi JIA Gangui YAN +2 位作者 Yuru CAI Yonglin LI Jinhao ZHANG 《现代电力系统与清洁能源学报(英文)》 CSCD 2019年第2期254-267,共14页
A small-signal model of photovoltaic(PV)generation connected to weak AC grid is established based on a detailed model of the structure and connection of a PV generation system. An eigenvalue analysis is then employed ... A small-signal model of photovoltaic(PV)generation connected to weak AC grid is established based on a detailed model of the structure and connection of a PV generation system. An eigenvalue analysis is then employed to study the stability of PV generation for different grid strengths and control parameters in a phaselocked loop(PLL) controller in the voltage source converter. The transfer function of the power control loop in the dq rotation frame is developed to reveal the influence mechanism of PLL gains on the small-signal stability of PV generation. The results can be summarized as follows:(1)oscillation phenomena at a frequency of about 5 Hz may occur when the grid strength is low;(2) the tuning control parameters of the PLL have a noticeable effect on the damping characteristics of the system, and larger proportional gain can improve the system damping;(3)within a frequency range of 4-5 Hz,the PLL controller has positive feedback on the power loop of PV generation. A virtual inductance control strategy is proposed to improve the operational stability of PV generation. Finally, a simulation model of PV generation connected to weak AC grid is built in PSCAD/EMTDC and the simulation results are used to validate the analysis. 展开更多
关键词 Photovoltaic generation WEAK AC GRID Small-signal model EIGENVALUE ANALYSIS Virtual INDUCTANCE control strategy
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基于Quanser的并网逆变器半实物系统设计 预览
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作者 季希宁 黄家才 +1 位作者 高芳征 刘义亭 《工业控制计算机》 2019年第6期149-150,159共3页
以加拿大Quanser公司的实时数据采集卡和实时系统为核心,采用基于模型的方法在Matlab中设计了并网模型,通过搭建外围硬件电路,形成了并网逆变器半实物仿真系统。系统采用Boost升压方法实现DC-DC电路,采用单相全桥逆变电路结构实现DC-AC... 以加拿大Quanser公司的实时数据采集卡和实时系统为核心,采用基于模型的方法在Matlab中设计了并网模型,通过搭建外围硬件电路,形成了并网逆变器半实物仿真系统。系统采用Boost升压方法实现DC-DC电路,采用单相全桥逆变电路结构实现DC-AC,通过数据采集卡输出PWM和SPWM波,用锁相环进行系统的同频、同相控制,最终实现逆变器并网输出。实验结果表明该方案可行,控制灵活高效,为并网控制算法研究提供了新的研发平台。 展开更多
关键词 Quanser数据采集卡 并网 半实物 逆变器 仿真
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Long-term performance of fiber-grid-reinforced asphalt overlay pavements: A case study of Korean national highways
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作者 Jong-Hoon Lee Seung-Beom Baek +2 位作者 Kang-Hoon Lee Jo-Soon Kim Jin-Hoon Jeong 《交通运输工程学报(英文版)》 CSCD 2019年第4期366-382,共17页
The objective of this study was to verify the effect of fiber grid reinforcement on the longterm performance of asphalt overlay pavements by performing field investigation, laboratory test, and finite element analysis... The objective of this study was to verify the effect of fiber grid reinforcement on the longterm performance of asphalt overlay pavements by performing field investigation, laboratory test, and finite element analysis. Crack, rutting, roughness, and other miscellaneous distresses of fiber-grid-reinforced overlay sections and ordinary overlay sections were compared. Pavement conditions of fiber grid overlay sections before and after the overlay were also compared. Cores were obtained from the fiber-grid-reinforced and ordinary sections to measure bonding shear strength between the intermediate and overlay layers.Fracture energy, displacement after yield, and shear stiffness of the cores were also obtained by analyzing the test results. Finite element analysis was performed by using the test results to validate the effect of the fiber grid reinforcement on the long-term performance of asphalt overlay pavements. Rutting and fatigue cracking were predicted for three cases: 1) fiber grid was not used;2) glass fiber grid was used;and 3) carbon fiber grid was used. The cracking ratio of fiber-grid-reinforced sections was much smaller than that of ordinary sections. The results of field investigation, laboratory test, and finite element analysis showed that the fiber grid reinforcement improved the long-term performance of asphalt overlay pavements. 展开更多
关键词 ASPHALT PAVEMENT FIBER GRID reinforcement OVERLAY PAVEMENT Finite element analysis Bonding shear strength
基于网格化的配电网规划改造策略研究 预览
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作者 曾曦 《电力系统装备》 2019年第9期36-37,共2页
以往在对配电网进行规划的过程中,采取的多是'自上而下'方式,这样的方式存在很多问题,为此特意进行了改造,通过'网格化'的方式来对配电网进行规划和改造,在区域控规的基础上,以实测符合为主要的模型,取得了非常好的效果... 以往在对配电网进行规划的过程中,采取的多是'自上而下'方式,这样的方式存在很多问题,为此特意进行了改造,通过'网格化'的方式来对配电网进行规划和改造,在区域控规的基础上,以实测符合为主要的模型,取得了非常好的效果.本文针对配电网规划改造的重要意义以及网格化配电网规划改造的策略进行具体研究,希望能给大家一些启发. 展开更多
关键词 网格化 配电网 规划改造 策略
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Potential Off Grid User Prediction System Based on Spark 预览
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作者 LI Xuebing SUN Ying +4 位作者 ZHUANG Fuzhen HE Jia ZHANG Zhao ZHU Shijun HE Qing 《中兴通讯技术:英文版》 2019年第2期26-37,共12页
With the increasingly fierce competition among communication operators,it is more and more important to make an accurate prediction of potential off grid users.To solve the above problem,it is inevitable to consider t... With the increasingly fierce competition among communication operators,it is more and more important to make an accurate prediction of potential off grid users.To solve the above problem,it is inevitable to consider the effectiveness of learning algo rithms,the efficiency of data processing,and other factors.Therefore,in this paper,we,from the practical application point of view,propose a potential customer off grid predic tion system based on Spark,including data pre processing,feature selection,model build ing,and effective display.Furthermore,in the research of off grid system,we use the Spark parallel framework to improve the gcForest algorithm which is a novel decision tree ensemble approach.The new parallel gcForest algorithm can be used to solve practical problems,such as the off grid prediction problem.Experiments on two real world datasets demonstrate that the proposed prediction system can handle large scale data for the off grid user prediction problem and the proposed parallel gcForest can achieve satisfying per formance. 展开更多
关键词 data mining OFF GRID prediction SPARK parallel COMPUTING deep FOREST
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城市配电网“网格化”规划方法研究 预览
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作者 张玲 吴稀西 +2 位作者 刘蓓 宋淑敏 郭强 《青海电力》 2019年第1期15-18,共4页
基于对城市配电网“网格化”规划方法的探讨和应用,阐述了城市配电网“网格化”规划方法基本的编制原则与流程,并对各环节应着重注意的关键问题进行了说明和规划编制及管理单元的细化;对规划中涉及与城市各层级相关规划的关系,要求务必... 基于对城市配电网“网格化”规划方法的探讨和应用,阐述了城市配电网“网格化”规划方法基本的编制原则与流程,并对各环节应着重注意的关键问题进行了说明和规划编制及管理单元的细化;对规划中涉及与城市各层级相关规划的关系,要求务必做到深度衔接与融合,以确保规划项目的落地性和适应性;同时提出“网格化”方法不仅适用于规划,而且对配电网建设与管理也有指导和推动作用。 展开更多
关键词 城市配电网 网格化 规划方法
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安哥拉Camacupa基准及其在工程领域的应用 预览
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作者 贺城 廖娜 《城市勘测》 2019年第2期132-135,共4页
安哥拉除使用在世界上广泛应用的WGS-84基准,还使Camacupa基准用于工程测量。由于WGS-84基准和Camacupa基准使用的参考椭球参数相近、投影方式相同,在工程应用时极易混淆。为了区分上述两种基准,避免造成工程定位错误,本文主要阐述了Cam... 安哥拉除使用在世界上广泛应用的WGS-84基准,还使Camacupa基准用于工程测量。由于WGS-84基准和Camacupa基准使用的参考椭球参数相近、投影方式相同,在工程应用时极易混淆。为了区分上述两种基准,避免造成工程定位错误,本文主要阐述了Camacupa基准的由来,介绍了Camacupa基准的参考椭球和投影方式及其在工程领域的应用,提出了从Camacupa基准到WGS-84基准的转换参数及现有条件下Camacupa基准在工程领域应用的风险和应对方法。 展开更多
关键词 Camacupa 坐标转换 基准 参考椭球 投影
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Non-Cooperative Differential Game Based Energy Consumption Control for Dynamic Demand Response in Smart Grid 预览
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作者 Manxi Wang Haitao Xu +3 位作者 Shengsong Yang Lifeng Yang Ruifeng Duan Xianwei Zhou 《中国通信:英文版》 SCIE CSCD 2019年第8期107-114,共8页
In this paper, we conduct research on the dynamic demand response problem in smart grid to control the energy consumption. The objective of the energy consumption control is constructed based on differential game, as ... In this paper, we conduct research on the dynamic demand response problem in smart grid to control the energy consumption. The objective of the energy consumption control is constructed based on differential game, as the dynamic of each users’ energy state in smart gird can be described based on a differential equation. Concept of electricity sharing is introduced to achieve load shift of main users from the high price hours to the low price hours. Nash equilibrium is given based on the Hamilton equation and the effectiveness of the proposed model is verified based on the numerical simulation results. 展开更多
关键词 energy consumption DYNAMIC DEMAND response smart grid differential GAME NASH EQUILIBRIUM
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一种基于网格划分的密度峰值聚类改进算法 预览
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作者 江平平 曾庆鹏 《计算机应用与软件》 北大核心 2019年第8期268-274,280共8页
针对密度峰值聚类(Density Peak Clustering,DPC)算法具有时空复杂度高而降低了对大规模数据集聚类的有效性,以及依靠决策图人工选取聚类中心等缺点,提出基于网格的密度峰值聚类(G-DPC)算法。采用基于网格的方式进行网格划分,用网格代... 针对密度峰值聚类(Density Peak Clustering,DPC)算法具有时空复杂度高而降低了对大规模数据集聚类的有效性,以及依靠决策图人工选取聚类中心等缺点,提出基于网格的密度峰值聚类(G-DPC)算法。采用基于网格的方式进行网格划分,用网格代表点替换网格单元整体;对各代表点聚类,通过改进的自适应方法选出核心网格代表点作为聚类中心;将剩余点归类,剔除噪声点。仿真实验验证了该算法对大规模数据集和高维数据集聚类的有效性。 展开更多
关键词 密度峰值 网格 聚类算法
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