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Search Results: 1 - 10 of 303375 matches for " 刘文君 "
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Spatial Data Index Method Based on P2P
一种基于P2P的空间数据索引方法

,
计算机科学 , 2012,
Abstract: This paper put foward a spatial data index based on group chord. At the same time, it provided a kind of spatial ctuery under this index frame and routing recovery. Test results present that this distributed index's maintenance cost is lower. So making using of this index to progress spatial index has scalability. The increase of the size of groups can decrease the query hops. But for the overall spending of this query, there is the most optimized size of group. In addition, this paper also put forward a routing recovery mechanism based on the space-taken, which can deal with the problems of peer failing efficiently and can reinforce the usability of the system as well.
P2P Spatial Querying-oriented Routing Recovery Method
一种面向P2P空间查询的路由恢复方法

,
计算机科学 , 2012,
Abstract: This paper analyzed the triggered problems due to invalidation, and put foward a routing recovery method based on taken space, so as to maintain the integrity of whole data space when peers fail. At the mean time, algorithms of peer joining and space quering based on this routing recovery method were provided. Test results present that this routing recovery method can resolve the problems of back-track quering messages and joining failing effectively,and can reinforce the usability of the system.
一种面向p2p空间查询的路由恢复方法
,
计算机科学 , 2012,
Abstract: 基于一种p2p空间查询系统,分析了该系统中节点失效时可能出现的问题,提出了一种基于空间接管的路由恢复方法,以在节点失效时维持整个数据空间的完整性。同时给出了在这种路由恢复方法下的节点加入以及空间查询算法。测试表明,这种路由恢复方法能有效地解决节点失效带来的空间查询消息“回溯”、节点不能加入系统等问题,增强了系统的可用性。
一种基于p2p的空间数据索引方法
,
计算机科学 , 2012,
Abstract: 提出一种基于分组chord#的p2p空间数据索引,并给出该索引结构下的空间查询以及路由恢复方法。测试表明,这种分布式索引的维护代价较低,利用其进行空间查询具有较好的可扩展性。分组的增加可以减少查询跳数,但对于查询的总开销,存在一个最优的分组成员个数。另外,提出的基于空间接管的路由恢复机制可以较好地应对节点失效的问题,增强了系统的可用性。
生物陶粒与生物活性炭上微生物群落结构的PCR-SSCP技术解析
小琳,
环境科学 , 2007,
Abstract: 采用PCR-SSCP(单链构象多态性)技术,以16SrRNA基因的V4-V5区为靶对象,分析用于饮用水处理的生物陶粒和生物活性炭上的微生物群落结构.对生物陶粒和生物活性炭上的微生物分别进行超声波洗脱、R2A和LB平板培养后提取基因组DNA.结果表明,除生物活性炭超声波洗脱不能提取到DNA外,其他处理均能提取到大小在10kb以上的基因组DNA,但所提取的量有较大差异.以提取的DNA为模板分别进行PCR,均能扩增到408bp的基因片段.这些片段经λ核酸外切酶消化处理后进行SSCP电泳.结果显示,超声波洗脱、R2A和LB培养对试验结果影响不明显.生物陶粒的微生物基因扩增片段SSCP图谱相同,且只出现1条带.测序后与基因组数据库对比,结果显示其与unculturedPseudomonassp.cloneFTL20116SrDNA(GenBank登录号AF509293.1)片段同源性为92%.生物活性炭的微生物基因扩增片段SSCP图谱也相同,但有2条带.测序对比的结果表明,这2个基因片段与Bacillussp.JH1916SrDNA(GenBank登录号DQ232748.1)片段和BacteriumVA-S-1116SrDNA(GenBank登录号AY395279.1)片段的同源性分别为100%和99%.
基于聚合–分解的并联水库群防洪优化调度研究
Optimization of Parallel Reservoirs for Flood Control Based on the Aggregation-Decomposition Method
 [PDF]

陈西臻, , 何素明, 张旺, 李泽, 张靖
Journal of Water Resources Research (JWRR) , 2015, DOI: 10.12677/JWRR.2015.41003
Abstract:
基于聚合–分解框架,构建了并联水库群防洪调度函数:在聚合步骤中,将总出库流量表示为聚合水库库容的分段线性函数;在分解步骤中,按各水库来水量比例分解总出库流量,得到各水库出库流量。从而构建了并联水库群防洪优化调度模拟模型,采用遗传算法进行模拟优化,识别分段线性函数的关键参数。以广西西江流域百色、龙滩、青狮潭三个并联水库为实例开展研究,计算结果表明,较常规调度,优化调度在率定期(共10场次洪水)和检验期(共5场次洪水)分别能使下游防洪控制点梧州站平均多削峰970 m3/s和1320 m3/s。因此,提出的方法对指导水库群防洪优化调度有一定价值。
The optimal operating rules for parallel reservoirs were built based on the aggregation-decom- position method. The relationship between the total release of the reservoirs and the aggregation reservoir storage could be expressed by piecewise-linear operating rules in the aggregation step, and the release was decomposed to each parallel reservoir according to its ratio of inflow in the decomposing procedure. Then the optimization model of parallel reservoirs was built, and its key parameters were calibrated by the Genetic Algorithm. Three parallel reservoirs (the Baise, Longtan and Qingshitan reservoirs) of the Xijiang River in China were selected for a case study. The optimal flood operating rules were compared with the conventional operating rules, and the flood peak of reference station for flood control could be decreased by 970 m3/s and 1320 m3/s in calibrated and validation periods, respectively. Thus, this method is beneficial for the reservoir’s real- time operation to decrease the flood disasters.
带特殊工艺约束的并行机器生产线调度问题的一种遗传算法
, 吴澄,
自动化学报 , 2001,
Abstract: ?研究带特殊工艺约束的并行机器生产线的调度方法.以完工时间、拖期时间和超库存时间的惩罚量之和最小为调度目标,对该优化调度问题提出了一种遗传算法,并在问题建模、遗传算法编码、初始种群的产生办法、交叉及变异方法等方面作了研究.数值计算结果表明所提出的遗传算法是有效的.
轻型直流输电系统的不对称故障控制策略
,宋强,文华
电网技术 , 2009,
Abstract: 基于电压源变流器(voltagesourceconverter,VSC)的轻型直流输电(VSC-HVDC)正成为一种经济灵活的新型输电方式。但是当交流系统发生不对称故障时,系统中存在的负序分量在脉宽调制(pulsewidthmodulation,PWM)的作用下会产生大量的非特征谐波,并严重恶化VSC-HVDC系统的控制性能。文章在换流站正序模型的基础上建立了系统的负序模型,提出一种基于精确反馈线性化理论的正负序电流非线性控制器,并针对系统故障时出现的直流过电压问题设计了2种应对策略。在电磁暂态仿真软件PSCAD/EMTDC下对上述控制策略进行了仿真验证,达到了预期的控制效果。
云制造装备资源感知与接入适配技术
李瑞芳,,,+
计算机集成制造系统 , 2012,
Abstract: 制造装备资源感知与接入是云制造物理资源虚拟化的关键。从制造装备状态感知、物联与面向云制造服务平台的接入适配三个方面进行阐述,分析特点,探讨关键技术,提出亟待解决的问题。分析了光纤光栅传感技术对制造装备资源感知的重要性及主要研究内容;探讨了制造装备物联的异构融合体系及装备资源融合接入方法和装置;从信息融合、描述与检索和资源服务发布三个方面研究了装备资源面向云制造服务平台的接入适配技术。以实现典型制造装备资源感知与接入适配为例,阐述其原型系统、感知与物联实现技术,以及面向云制造服务平台的接入适配方法。
进化计算在生产线调度研究中的现状与展望
,,吴澄
计算机集成制造系统 , 2001,
Abstract: 描述了典型生产线调度类型,并分析了其复杂性、不确定性、多目标和多约束等特点;简要介绍了进化计算的思想、优点;围绕其应用核心——遗传编码和操作,分类评述了进化计算在单机、并行机、流水线、可重入式生产线、作业和混合生产线等调度问题中的应用情况;并从调度模型和进化计算两方面探讨了面向实际生产线调度的研究前景。
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