超市管理系统-毕业论文

毕业设计（论文）题目超市管理系统姓名学号专业班级指导教师分院信息科学与工程学院完成日期2013年5月28日I摘要本文建立了一种基于粒子群（PSO）算法优化BP神经网络的改进股票预测模型。该模型采用时间序列作为输入数据，以此来构造BP神经网络拓扑结构，利用粒子群算法优化BP神经网络的权值和阈值。同时，考虑到由于股票市场受到多种因素的影响，故股票价格形成的时间序列是非平稳的且具有强噪声的，本文用小波降噪来处理样本数据，使得数据更加真实地反映股票趋势。结果表明，经过小波降噪处理后的时间序列数据更加平稳；粒子群算法优化后的BP神经网络预测模型能够有效弥补BP神经网络的不足，改善BP神经网络易陷入局部最优的问题，在一定程度上达到了提高算法性能的目的。关键词：小波降噪；BP神经网络；股票预测；PSO优化IIAbstractBasedontheanalysisandstudyoftheartificialneuralnetwork(ANN),thispaperproposestheimprovedstockforecastingmodelofBPneuralnetworkoptimizedonthefoundationofParticleSwarmOptimization.ThismodelusestimeseriesastheinputdatatoestablishBP’s(BackPropagation)neuralnetworktopology,andusesParticleSwarmOptimizationtooptimizetheitsweightandthreshold.Inthemeantime,takingthevariousfactorsthataffectstockmarketintoconsideration,itcanbefoundthatthetimeseriesofstockpriceisunstableandstrong-noisy.Waveletde-noisingisusedtodealwithsampledatasothatthedatacanmoreauthenticallyreflectthestocktendency.Theresultsshowthatthetimeseriesdataafterwaveletde-noisingaremorestable;BPneuralnetworkforecastingmodelafterParticleSwarmOptimizationcanmakeuptheweaknessofBPneutralnetworkandmendtheproblemthatBPneuralnetworkcaneasilygetstuckintolocaloptimum.Asaresult,thiscanobviouslyimprovearithmeticperformancetocertainextend.Keywords:Waveletnoisereduction;BPneuralnetwork;Stockforecast;PSOoptimizationIII目录摘要.........................................................................................................................IABSTRACT.................................................................................................................II目录........................................................................................................................III第1章概述...............................................................................................................51.1引言................................................................................................................51.2超市管理的研究现状....................................................................................61.3超市管理系统主流开发技术........................................................................71.4超市管理中存在问题....................................................................................81.5选题的意义....................................................................................................91.6本文研究内容..............................................................................................10第2章开发环境及关键技术研究.........................................................................122.1开发环境及相关介绍..................................................................................122.1.1开发环境.....................................................................................................122.1.2数据库........................................................................................................122.1.3java语言..................................................................................................132.2关键技术......................................................................................................142.2.1AJAX技术..................................................................................................142.2.1JSON技术..................................................................................................142.2.2SESSION和JQuery...................................................................................15第3章需求分析和系统设计.................................................................................163.1需求分析......................................................................................................163.1.1功能需求....................................................................................................163.1.2性能需求....................................................................................................163.1.3用户体验需求............................................................................................16IV3.2系统结构和流程图......................................................................................173.2.1系统的组成结构......................................................................................173.2.2流程图........................................................................................................173.3系统设计......................................................................................................183.3.1数据库设计................................................................................................183.3.2功能模块设计............................................................................................22第4章超市管理系统的实现.................................................................................234.1超市管理系统界面与功能简述..................................................................234.2系统代码结构..............................................................................................294.3网站关键技术实现......................................................................................30第5章总结和展望.............................................