基于综合因素的 WebGIS 优化加权负载均衡的研究     

杨虹  苗泽  陈倩倩 《测绘与空间地理信息》2013,(9)

日益增长的海量GIS数据使得网络集群负载均衡面临着越来越大的考验,然而目前对WebGIS负载均衡的研究模型均是针对某些方面的负载问题提出解决方案,具有一定的局限性。本文基于传统加权负载均衡模型,综合考虑节点性能、数据组织、访问热点等因素,提出了基于综合因素的WebGIS优化加权负载均衡模型来处理WebGIS中出现的常见负载问题,提高网络系统整体的稳定性。  相似文献   

Modeling the spatiotemporal dynamics of electric power consumption in Mainland China using saturation-corrected DMSP/OLS nighttime stable light data     

《International Journal of Digital Earth》2013,6(12):993-1014

Obtaining timely and accurate data on the spatiotemporal dynamics of electric power consumption (EPC) is crucial for the effective utilization of electric power in China. The Defense Meteorological Satellite Program's Operational Linescan System (DMSP/OLS) nighttime stable light (NSL) data have good potential for estimating EPC effectively at large scales. However, saturated lighted pixels contained within the NSL data limit the accuracy of EPC estimation. We developed a new method to correct the saturated lighted pixels, using the SPOT VEGETATION (SPOT/VGT) 10-day synthesis product (S10) normalized difference vegetation index (NDVI) data and then modeled the spatiotemporal dynamics of EPC in Mainland China from 2000 to 2008. The results demonstrated the reliability of our approach with an average R value of 0.93 (P<0.001) and an average relative error of ?28.92%. EPC in Mainland China showed an average annual growth rate of 13.46% during the study period from 1198.23 billion kWh in 2000 to 3290.51 billion kWh in 2008. EPC in Mainland China also showed clear regional variation. Northern coastal China and eastern coastal China consumed 37.61% of the total EPC in Mainland China, with only 25.96% of the population and 6.11% of the area.  相似文献   

Simulation of sediment transport during flood events: laboratory work and field experiments     

RENAAT DE SUTTER  RONNY VERHOEVEN  ANDREAS KREIN 《水文科学杂志》2013,58(4):599-610

Abstract

This paper aims at initiating a fundamental understanding of the suspended load transport of river sediment in unsteady flow. Laboratory erosion tests as well as artificial flood experiments are used to evaluate the influence of the transient regime on the transport efficiency of the flow. The erosion experiments reveal that the transport capacity is augmented when the unsteadiness of the flow increases. However, the influence of the transient regime is counteracted by the cohesive properties of the river bed. Field experiments with artificial floods released from a reservoir into a small canal confirm these findings and show a relationship between the friction velocity and the suspended load transport. An appropriate parameter β is proposed to evaluate the impact of the transient regime on the transport of suspended sediment.  相似文献   

综合物探在莘县地区地热勘查中的应用     

马晓东  ;刘洪波  ;白锦林 《物探与化探》2014,(3):461-464

莘县地区广泛被新生代地层覆盖,并且厚度较大,在该区寻找地热资源,首先应查明热储层、盖层及断裂构造的特征。在本区CSAMT法对断裂构造具有很好的横向分辨能力,直流电测深对新生界地层具有较好的分辨效果。在收集有关地质、地震、测井等资料的基础上,通过利用直流电测深半定量的解释结果作为CSAMT定量解释的约束条件进行地质综合推断,基本查清了区内深部隐伏的地层、热储层、断裂构造的埋深及展布特征,取得了很好的勘查成果。综合应用两种物探方法对类似地区进行地热资源的前期勘查,可以高质、高效地取得勘探成果。  相似文献   

高密度电法在和田隐伏断层探测中的应用   总被引：1，自引：0，他引：1  

葛鸣  邢立杰  罗福忠  阿里木江  黄静宇  秦学林 《中国煤炭地质》2014,(12):62-65

西昆仑山前一系列的新生代背斜的翼部往往伴生向南斜倾的逆断裂,这些断裂隐伏于早更新世或中更新世洪积砂砾石层,构成了和田隐伏断裂带。该断裂带由2条陡坎状断层组成,宽约10.6km,深度20~300m,落差110~270m。根据卫星影像和地质工作成果,和田隐伏断裂的一支从和田市南部穿过,但南郊飞机场附近没有露头,为探查断层在该区域的位置及深度,沿垂直于推测的断层走向布设2条测线,采用温纳（WN）测量系统对其进行探测。探测结果表明：2条测线皆发现了逆断层,均上切错断了上覆晚更新世地层,其中测线1存在2处断层,一处断层倾向南,倾角50°左右,另一处断层倾向北,倾角约55°;测线2存在一处断层,倾向北,倾角近80°。通过比对高密度电法资料和地质出露点剖面,推断和田断层在第四系以来有过两次明显的活动,导致晚更新世砂砾石土层被断错。  相似文献   

Prediction of ultimate axial load-carrying capacity of piles using a support vector machine based on CPT data     

《Computers and Geotechnics》2014

The support vector machine (SVM) is a relatively new artificial intelligence technique which is increasingly being applied to geotechnical problems and is yielding encouraging results. In this paper SVM models are developed for predicting the ultimate axial load-carrying capacity of piles based on cone penetration test (CPT) data. A data set of 108 samples is used to develop the SVM models. These data were obtained from the literature containing pile load tests and each sample contains information regarding pile geometry, full-scale static pile load tests and CPT results. Moreover, a sensitivity analysis is carried out to examine the relative significance of each input variable with respect to ultimate strength prediction. Finally, a statistical analysis is conducted to make comparisons between predictions obtained from the SVM models and three traditional CPT-based methods for determining pile capacity. The comparison confirms that the SVM models developed in this paper outperform the traditional methods.  相似文献   

简谐荷载作用下饱和土体中圆形衬砌隧道三维动力响应分析   总被引：2，自引：0，他引：2  

曾晨  孙宏磊  蔡袁强 《岩土力学》2014,35(4):1147-1156

研究了全空间饱和土体中圆形衬砌隧道在径向简谐点荷载作用下的三维动力响应,将衬砌用无限长圆柱壳来模拟,土体用Biot饱和多孔介质模型来模拟,引入两类势函数来表示土骨架的位移和孔隙水压力,并利用修正Bessel方程来求解各势函数,结合边界条件,得到频率-波数域内衬砌和土骨架位移、孔隙水压力的解答,最后进行Fourier逆变换得到时间-空间域内的响应。通过算例分析了荷载振动频率和土体渗透性对土体和衬砌位移响应及土体孔压的影响。结果表明,饱和土体和弹性土体的位移响应具有明显区别。随着荷载频率的增大,土体和隧道位移幅值减小,土体孔压幅值增大;随着土体渗透性增大,土体位移及孔压幅值减小。  相似文献   

一种基于机载激光点云的门型电塔精确提取方法     

刘玉贤  阮明浩  闫臻 《测绘通报》2022,(7):129-133

随着无人机技术的发展,越来越多的电力部门采用机载激光雷达及倾斜摄影测量技术代替传统的人工方法,进行电力巡检、电力部件检修等工作。门型电塔为目前电力走廊中比较常见的一种高压电塔。在无数据标签的电网点云数据中,对门型电塔进行精确点云提取是门型电塔日常维护的重要工作。本文从包含有地面、植被、电力线、门型电塔的电网点云数据入手,首先对点云进行体素化分割,对体素网格进行高程连续与高程阈值的筛选,并对电塔顶部进行扩展搜索,达到去除地面点及植被点的目的。然后根据门型电塔水平投影成条状的特点,利用门型电塔的圆柱杆塔部分得到门型电塔的水平投影直线,再通过距离阈值判断去除点云中多余的电力线点。本文介绍的方法实现了从无标签的电网点云数据中对门型电塔的精确提取,为进一步进行门型电塔的三维建模、维护检修等工作提供了数据基础。  相似文献   

海上风机超大直径单桩竖向抗压承载力理论计算及实测方法对比评价     

张辉宇  贺瑞  陈强  肖纪升  褚严春 《海洋工程》2022,40(1):104-115

超大直径单桩基础在应用过程中,存在钢管桩沉桩的选锤、防溜桩等关键问题.为解决以上问题,研究超大直径单桩的竖向抗压承载力是有必要的.分别利用《码头结构设计规范》规定的设计做法、圆孔扩张理论法、UWA-05方法、GRLWEAP模型方法对超大直径钢管桩的竖向抗压承载力进行了分析计算并结合工程实例进行比较,发现现行规范规定的钢管桩承载力计算公式对于超大直径钢管桩承载力的估计偏于保守,高应变检测法对于超大直径单桩基础承载力的评估同样偏于保守.  相似文献   

基于融合GMM与SVM的船载非侵入式负荷识别方法     

贾东宁 《中国海洋大学学报(自然科学版)》2022,52(1):129-133

为保障安全的船载用电环境,实现合理的用电配置与管理,在船载电力布局中引入非侵入式电力负荷监测。提出了一种融合高斯混合模型(GMM)与支持向量机(SVM)的电器类型识别算法。该方法利用暂态事件检测所提取的有效负荷特征,建立具有较好统计分布能力的GMM模型和具有较好泛化能力的SVM模型。对两种算法的概率分布进行融合生成最终识别结果。实验结果表明,相对单独应用SVM模型,本文所用方法在准确率和稳定性方面均有一定程度的提升,且实现复杂度低,具有良好的实用价值。  相似文献