基于改进粒子群优化RBF神经网络的地理信息预测     

蚩志锋  杨先武 《测绘科学》2012,37(3):139-141

本文首先针对标准粒子群优化算法容易陷入局部最优的缺点,采用动态自适应调节策略,使得粒子的惯性权重随群体聚集程度而适时变化,从而调整粒子群搜索的速度和方向以跳出局部最优;然后将粒子群算法的全局搜寻能力和RBF网络的局部优化能力相结合,利用改进的粒子群优化算法优化RBF神经网络的关键参数;并将其应用于地理信息的预测,得到满意的结果。  相似文献   

多发点地震紧急运输优化系统的设计     

王艳萍  刘文堂  赵永安 《地震工程学报》2011,33(4):326-330

大地震后的救灾运输不仅要求及时,还要保证运输量上充足.本文提出一种基于图层拼接的多发点(多个站点同时出发)地震紧急救灾运输系统的构建方案,既能够充分挖掘震后实际交通网络的潜力,又能够综合考虑多条线路同时发送救灾物资的并行运输问题,避免多条运输线路同时运输造成的交通拥堵,并能满足运输量的需求.  相似文献   

竖向预应力锚索抗滑桩的优化研究   总被引：1，自引：0，他引：1  

许英姿  韦万正  卢玉南 《工程地质学报》2011,19(1):83-87

竖向预应力锚索抗滑桩是一种锚索从桩顶竖向穿过抗滑桩,直接嵌入基岩以下的新型抗滑桩.本文以某滑坡治理工程为例,采用数值模拟方法,研究竖向预应力锚索抗滑桩的内力,从桩长、锚固力、偏心距几个方面对竖向预应力锚索抗滑桩的桩身结构进行优化研究.模拟研究结果表明,其他条件不变时,竖向预应力锚索抗滑桩随着桩长的减小,桩身弯矩最大值变...  相似文献   

A Gestalt rules and graph-cut-based simplification framework for urban building models     

《International Journal of Applied Earth Observation and Geoinformation》2015

To visualize large urban models efficiently, this paper presents a framework for generalizing urban building footprints and facade textures by using multiple Gestalt rules and a graph-cut-based energy function. First, an urban scene is divided into different blocks by main road networks. In each block, the building footprints are partitioned into potential Gestalt groups. A footprint may satisfy several Gestalt principles. We employ the graph-cut-based optimization function to obtain a consistent segmentation of the buildings into optimal Gestalt groups with minimal energy. The building footprints in each Gestalt group are aggregated into different levels of detail (LODs). Building facade textures are also abstracted and simplified into multiple LODs using the same approach as the building footprint simplification. An effective data structure termed SceneTree is introduced to manage these aggregated building footprints and facade textures. Combined with the parallelization scheme, the rendering efficiency of large-scale urban buildings is improved. Compared with other methods, our presented method can efficiently visualize large urban models and maintain the city's image.  相似文献   

Multidisciplinary Design Optimization of A Human Occupied Vehicle Based on Bi-Level Integrated System Collaborative Optimization     

赵敏  崔维成  李翔 《海洋工程》2015,29(4):599-610

The design of Human Occupied Vehicle (HOV) is a typical multidisciplinary problem, but heavily dependent on the experience of naval architects at present engineering design. In order to relieve the experience dependence and improve the design, a new Multidisciplinary Design Optimization (MDO) method “Bi-Level Integrated System Collaborative Optimization (BLISCO)” is applied to the conceptual design of an HOV, which consists of hull module, resistance module, energy module, structure module, weight module, and the stability module. This design problem is defined by 21 design variables and 23 constraints, and its objective is to maximize the ratio of payload to weight. The results show that the general performance of the HOV can be greatly improved by BLISCO.  相似文献   

地下水动态观测网优化方法综述     

仵彦卿  李俊亭 《地球科学与环境学报》1993,(1)

本文旨在对地下水动态观测网优化方法做以回顾,并对现有研究技术做以评述;在此基础上,提出了地下水动态观测网的基本概念与分类,指出了今后地下水动态观测网优化设计的研究方向。  相似文献   

蜗杆凸轮间歇机构的设计及参数选择     

陈泽球 《广东海洋大学学报》1996,(1)

用优化设计的观点，论述了蜗杆凸轮间歇（分度）运动机构的工作原理、参数与运动规律的选择、设计方法。  相似文献   

地下水动态监测周期的优化     

李凯 《国土资源》1992,(2)

地下水动态监测是获得地下水动态信息,掌握其变化规律的直接手段。目前,地下水动态长期监测多数采用5天一次的监测周期,也有选用10天的。根据数理统计分析的原理,可针对不同动态类型区地下水变化特征以及不同时期的地下水变化规律,观测精度要求,采用不同的监测周期。  相似文献   

一株海洋解淀粉芽孢杆菌(Bacillus amyloliquefaciens)生产Macrolactin B的发酵条件优化   总被引：1，自引：1，他引：0  

王洪强  何山  杨锐  朱鹏  严小军 《海洋与湖沼》2013,44(6):1592-1596

从浙江台州近海上层海水中分离到一株可产Macrolactin类大环内酯抗生素的海洋细菌,经形态特征分析及16S rRNA测序比对,鉴定并将其命名为解淀粉芽孢杆菌(Bacillus amyloliquefaciens)ESB-2。运用Minitab软件,通过Plackett-Burman和Box-Behnken实验及响应面分析对该菌生产Macrolactin B的发酵条件进行优化,得到该菌生产Macrolactin B的最佳发酵条件为：葡萄糖17.0mg/L,蛋白胨5mg/L,酵母粉1mg/L,FePO4 0.01mg/L,初始pH 6.0,培养温度27.2℃,接种量5%,装液量57.6%,培养时间4d,在优化发酵条件下,Macrolactin B的最高产量达到13.6μg/ ml,比优化前提高了8倍,为该活性物质药源问题的解决打下了良好基础。  相似文献   

Modeling for the optimization of layout scenarios of cluster manifolds with pipeline end manifolds     

《Applied Ocean Research》2014

The pipeline end manifold (PLEM) is an important subsea facility, which can greatly reduce the cost and risk of the development scenarios of deepwater oil and gas fields by declining the number of export pipelines and risers. However, the employment of PLEMs is a multidiscipline task involving substantial financial and technical factors. Due to various uncertainties of influencing factors, the evaluation process may take several months or years by the engineers with rich project experience. Thus, how to develop quantified reference tools using mathematical models to assist engineers in efficiently making their crucial decisions is essential. In this paper, the optimization of the layout scenarios of cluster manifolds with PLEMs is discussed, where a proposed mathematical model and its dedicated algorithm are illustrated. The optimal solution at the lowest cost can be obtained through in-house routine in MATLAB, including the optimal layout scenario, the number and locations of PLEMs, and the connection relations. Besides, the numerical simulations are performed to demonstrate the validity of the proposed mathematical model and its algorithm. The results show that this optimization layout problem in engineering can be described accurately by the presented mathematical model and the convergence rate of the given algorithm is efficient.  相似文献