基于相空间重构的FOA-GLSSVM深基坑变形预测模型研究     

谢洋洋  吴大鹏  付超  周杰  史益军 《大地测量与地球动力学》2018,38(10):1048-1052

针对LSSVM模型参数选择的随机性与单一变量序列高维度重构参数选择的困难性，将相空间重构理论、果蝇优化算法引入LSSVM模型中，建立基于相空间重构的FOA-GLSSVM变形预测模型。为了验证提出模型的有效性与可靠性，结合具体工程实例与GLSSVM、支持向量机模型及最小二乘支持向量机模型进行对比研究。结果表明，提出的模型精度更好、稳定性更强。  相似文献   

Intelligent control for modeling of real‐time reservoir operation,part II: artificial neural network with operating rule curves     

Ya‐Ting Chang  Li‐Chiu Chang  Fi‐John Chang 《水文研究》2005,19(7):1431-1444

To bridge the gap between academic research and actual operation, we propose an intelligent control system for reservoir operation. The methodology includes two major processes, the knowledge acquired and implemented, and the inference system. In this study, a genetic algorithm (GA) and a fuzzy rule base (FRB) are used to extract knowledge based on the historical inflow data with a design objective function and on the operating rule curves respectively. The adaptive network‐based fuzzy inference system (ANFIS) is then used to implement the knowledge, to create the fuzzy inference system, and then to estimate the optimal reservoir operation. To investigate its applicability and practicability, the Shihmen reservoir, Taiwan, is used as a case study. For the purpose of comparison, a simulation of the currently used M‐5 operating rule curve is also performed. The results demonstrate that (1) the GA is an efficient way to search the optimal input–output patterns, (2) the FRB can extract the knowledge from the operating rule curves, and (3) the ANFIS models built on different types of knowledge can produce much better performance than the traditional M‐5 curves in real‐time reservoir operation. Moreover, we show that the model can be more intelligent for reservoir operation if more information (or knowledge) is involved. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

一种具有多维收敛能力的内容寻址网络     

彭宗锦  楚丁 《成都信息工程学院学报》2008,23(1):16-20

CAN（Content-Addressable Network）在d维的虚拟空间中利用分布式哈希表（Distributed Hash Table,DHT）来定位资源。CAN提供了一套比较有效的路由算法,但是节点能力的异构性并没有被考虑到算法中。这里提出了一种CAN路由的改进算法,通过扩展CAN邻居的定义和重构路由表等方式,使节点的异构性被考虑在路由算法中。同时该算法使得定位消息能从多维方向向着目标区域收敛,有效地提高了CAN路由消息的效率。  相似文献   

基于神经网络和卡尔曼滤波算法的说话人识别   总被引：1，自引：0，他引：1  

张余生  夏秀渝  杨莎 《成都信息工程学院学报》2008,23(4)

首先从语音信号中提取出特征参数:线性预测倒谱系数(LPCC)和用小波包提取的小波特征参数(WPC);语音特征分类模型则选择多层前馈式神经网络(MBP网络),并将奇异值分解运用到扩展卡尔曼滤波(EKF)算法中作为神经网络的学习算法.仿真结果表明,小波特征参数具有良好的识别效果;同时采用改进后的扩展卡尔曼滤波(EKF)算法使人工神经网络具有更稳定、更准确的分类性能.  相似文献   

图像端元全自动提取方法研究   总被引：1，自引：0，他引：1  

齐建成  朱述龙  朱宝山  赵泳  李二森 《海洋测绘》2009,29(2):16-19

传统端元提取算法一般需要人工指定端元数目，易导致多选或漏选端元。提出了一种端元全自动提取方法，通过研究分类结果的均方根误差、端元间光谱相关性与端元数目的关系，设置两种循环结束条件，当分类结果的均方根误差最小或端元间恰未出现强相关现象时，获得最佳端元数。实验表明，该方法是正确有效的，能够克服现有方法的不足，提高了端元提取自动化程度。  相似文献   

Underground water quality model inversion of genetic algorithm     

MA Ruijie  LI Xin. College of Mathematics  Jilin University  Changchun  China . College of Construction Engineering  China 《东北亚地学研究》2009,(3):164-167

The underground water quality model with non-linear inversion problem is ill-posed, and boils down to solving the minimum of nonlinear function. Genetic algorithms are adopted in a number of individuals of groups by iterative search to find the optimal solution of the problem, the encoding strings as its operational objective, and achieving the iterative calculations by the genetic operators. It is an effective method of inverse problems of groundwater, with incomparable advantages and practical significances.  相似文献   

Minimal Time Ship Routing Using IRS-P4 (MSMR) Analyzed Wind Fields     

J. K. Panigrahi  P. A. Umesh 《Marine Geodesy》2008,31(1):39-48

Minimal time ship routing is studied between Mumbai port (India) to Mombasa port (Kenya) using model hindcast wave climate over the Arabian Sea. With the launch of IRS-P4 (OCEANSAT-I), it became possible now to carry out routine wave hindcasting over the Indian Ocean. The MSMR channel of the satellite gives scalar wind, which is analyzed at NCMRWF, India, for converting to vector winds. The same is used as input to third-generation spectral wave model WAM for regional grid system for simulating the rough weather period of July 2000. This simulated wave climate formed the basis for computing effective ship velocity in the irregular seaway. This study gives a quantitative estimation of change in ship velocity in the open Indian Ocean for a bulk carrier. The minimal time path is charted using Dijkstra's algorithm for optimum route voyage. The optimum track information has broad scope for obtaining a safer route, least time route by avoiding delay in schedule with minimum fuel consumption.  相似文献   

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李祖宁  刘序俨  吴绍祖  陈光 《大地测量与地球动力学》2007,27(5):18-21

????1995~2003????GPS????????????????????????? ?????????GPS????????????????????????????仯????????????????????????????????????????????????????,??1995~1997???2001~2003???????????????????????????????????????????????????С??????н??仯??????仯????????1999????弯??7.6?????????????????????????  相似文献   

测量平差中求解协因数的简化算法   总被引：3，自引：1，他引：2  

杨雪峰  龚涛  汪精河 《测绘科学》2009,34(1)

本文从测量平差精度评定的求解协因数阵的过程中,寻找了一种有关协因数阵的简便算法,此算法的特点在于从已知的解法中,提炼出一种便于理解和记忆的方法,从经典的平差解答中找出规律,从而避免了去死记硬背复杂的结论。本文针对提出的简便算法,在条件平差、间接平差、附参数的条件平差和附限制条件的间接平差中通过验证,结果是正确的。  相似文献   

一种公交换乘路线智能选择的新方法     

陈丽佳  邹峥嵘  李光强 《测绘科学》2009,34(6)

公交换乘问题是公共交通信息查询的重要内容,本文首先叙述了经典Dijkstra算法,并分析了其不适合公交网络最优路径选择的原因。然后提出了一种改进的Dijkstra算法,该算法将求解最短路径获得的站点作为搜索站点,并将这些站点及经过这些站点的线路构成换乘矩阵,结合换乘次数的要求,给出了基于Dijkstra的智能选择换乘线路的实现算法。最后通过一个实际算例说明改进的Dijkstra算法在公交换乘路线选择中应用的可行性。  相似文献