最优化特性和变化的流域初始状态对新安江模型参数的影响

本对流域状态和最优化特性是如何影响模型功能方面进行了研究．在假设流域诸多初始条件下，使用SCE-UA优化算法通过日模型率定新安江模型．结果发现流域的初始条件和最优化特性对待优化的参数有非常大的影响，并且使模型过程参数的响应程度变小．研究结果表明变化的初始条件对总产流的影响并不是太大．     

薄壁铸件反重力充填的守恒标量法研究

1　Introduction　SofarthemainalgorithmsadaptedtothenumericalsimulationformouldfillingareMAC ,SMAC[1] ,SOLA VOF[2 ] ,SIMPLEconservativescalarmethod[3] ,etc .Tosimulatemoldfilling ,MACandSMACmethodswilloccupylargequantityofcomputermemory ,andcostmuchcomputationtime .Atpresent ,thealgorithmsusedtosimulatemouldfillingofcastingsmainlyfocusonSOLA VOFandSIMPLEconservativescalar .Com paringwithSOLA VOF ,SIMPLEconservativescalaralgorithmismuchmoresuperior .Inaspectofmomen tumequat…     

基于贝叶斯证据框架下支持向量机建模的迭代优化控制

In the paper,an iterative method is presented to the optimal control of batch processes.Generally it is very difficult to acquire an accurate mechanistic model for a batch process.Because support vector machine is powerful for the problems characterized by small samples,nonlinearity,high dimension and local minima,support vector regression models are developed for the optimal control of batch processes where end-point properties are required.The model parameters are selected within the Bayesian evidence framework.Based on the model,an iterative method is used to exploit the repetitive nature of batch processes to determine the optimal operating policy.Numerical simulation shows that the iterative optimal control can improve the process performance through iterations.     

一种快速大数乘法器的设计方法——大数乘法的高速实现

本文介绍了大数乘法器的一种高速实现算法,采用了Booth算法和Wallace Tree算法,通过减少部分积,并把大数加法拆分为32位的加法来实现对于大数乘法的高速运算.其核心的数据通路仅有一个16位的乘法器和一个32位的加法器组成,真正实现了以"小"资源实现了"大"运算.     

基于Rijndael的无线安全技术研究

分析Rijndael加密算法的原理,讨论Rijndael加密算法在保障无线局域网通信安全方面的有效性,提出了基于Rijndael的密钥更新方案,并对其性能进行了简单分析。     

Optimization of band-notched UWB antenna using micro-genetic algorithm combined with FDTD

The micro-genetic algorithm(MGA)optimization combined with the finite-difference time-domain(FDTD)method is applied to design a band-notched ultra wide-band(UWB)antenna. A U-type slot on a stepped U-type UWB monopole is used to obtain the band-notched characteristic for 5 GHz wireless local area network(WLAN)band. The measured results show that voltage standing wave ration(VSWR)less than 2 covers 3.1-10.6 GHz operating band and VSWR more than 2 is within 5.150-5.825 GHz notched one with the highest value of 5.6. Agreement among the calculated, HFSS simulated and measured results validates the effectiveness of this MGA-FDTD method, which is efficient for UWB antennas design.     

一种基于N-Gram改进的文本特征提取算法

介绍一种改进的文本特征提取及匹配算法。该算法基于N-Gram算法思路进行文本处理和特征提取，设计了gram关联矩阵用于统计与合并特征词，从而在固定长度N-Gram算法的基础上能够提取出不同长度的特征词。实验证明，该特征提取算法能够更为准确地描述文本特征，可应用于文本检索、Web挖掘等信息处理领域。     

自动化码头ALV实时任务分配

为弥补自动化集装箱码头自动装载车（Automated Lifting Vehicle, ALV）先到先服务（First Come First Service, FCFS）分配方式的缺陷,提出基于触发事件的ALV作业任务实时分配方式.设置一组触发事件触发ALV实时分配,以ALV到达任务作业点估计时间最短为目标,建立ALV实时分配模型,选用A*算法对该模型进行求解.通过与贪婪算法的对比,验证A*算法的优越性.对用A*算法求解大型集装箱码头ALV实时分配问题的求解速度和稳定性进行实验测试,结果验证了选用A*算法的可行性.     

数据挖掘技术及其在电子商务中的应用

介绍了数据挖掘技术的产生、发展和现状,分析了数据挖掘技术在电子商务中应用较为成功的电子商务推荐系统,同时对常用的数据挖掘算法提出了一种改进算法,并通过实验进行了验证。